[PATCH for-6.2 00/34] target/arm: Third slice of MVE implementation

[PATCH for-6.2 00/34] target/arm: Third slice of MVE implementation

[Peter Maydell]

This patchseries provides the third slice of the MVE implementation.
In this series:
 * fixes for minor bugs in a couple of the insns already upstream
 * all the remaining integer instructions
 * the remaining loads and stores (scatter-gather and interleaving)

This is obviously for-6.2 material, so no urgency in reviewing it.
But "all the integer stuff done" seemed like an obvious natural
break point to send out what I've done so far.

I apologize in advance for the final patch, which was tricky for
me to write and is probably going to be painful to review too.
This is mostly because I find the interleaving loads/stores
rather confusing...

thanks
-- PMM

Peter Maydell (34):
  target/arm: Note that we handle VMOVL as a special case of VSHLL
  target/arm: Print MVE VPR in CPU dumps
  target/arm: Fix MVE VSLI by 0 and VSRI by <dt>
  target/arm: Fix signed VADDV
  target/arm: Fix mask handling for MVE narrowing operations
  target/arm: Fix 48-bit saturating shifts
  target/arm: Fix calculation of LTP mask when LR is 0
  target/arm: Fix VPT advance when ECI is non-zero
  target/arm: Factor out mve_eci_mask()
  target/arm: Fix VLDRB/H/W for predicated elements
  target/arm: Implement MVE VMULL (polynomial)
  target/arm: Implement MVE incrementing/decrementing dup insns
  target/arm: Factor out gen_vpst()
  target/arm: Implement MVE integer vector comparisons
  target/arm: Implement MVE integer vector-vs-scalar comparisons
  target/arm: Implement MVE VPSEL
  target/arm: Implement MVE VMLAS
  target/arm: Implement MVE shift-by-scalar
  target/arm: Move 'x' and 'a' bit definitions into vmlaldav formats
  target/arm: Implement MVE integer min/max across vector
  target/arm: Implement MVE VABAV
  target/arm: Implement MVE narrowing moves
  target/arm: Rename MVEGenDualAccOpFn to MVEGenLongDualAccOpFn
  target/arm: Implement MVE VMLADAV and VMLSLDAV
  target/arm: Implement MVE VMLA
  target/arm: Implement MVE saturating doubling multiply accumulates
  target/arm: Implement MVE VQABS, VQNEG
  target/arm: Implement MVE VMAXA, VMINA
  target/arm: Implement MVE VMOV to/from 2 general-purpose registers
  target/arm: Implement MVE VPNOT
  target/arm: Implement MVE VCTP
  target/arm: Implement MVE scatter-gather insns
  target/arm: Implement MVE scatter-gather immediate forms
  target/arm: Implement MVE interleaving loads/stores

 target/arm/helper-mve.h    |  295 +++++++++
 target/arm/translate-a32.h |    2 +
 target/arm/vec_internal.h  |   11 +
 target/arm/mve.decode      |  228 ++++++-
 target/arm/t32.decode      |    1 +
 target/arm/cpu.c           |    3 +
 target/arm/mve_helper.c    | 1259 ++++++++++++++++++++++++++++++++++--
 target/arm/translate-mve.c |  865 ++++++++++++++++++++++++-
 target/arm/translate-vfp.c |    2 +-
 target/arm/translate.c     |   33 +
 target/arm/vec_helper.c    |   14 +-
 11 files changed, 2628 insertions(+), 85 deletions(-)

-- 
2.20.1

[PATCH for-6.2 01/34] target/arm: Note that we handle VMOVL as a special case of VSHLL

[Peter Maydell]

Although the architecture doesn't define it as an alias, VMOVL
(vector move long) is encoded as a VSHLL with a zero shift.
Add a comment in the decode file noting that we handle VMOVL
as part of VSHLL.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve.decode | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 595d97568eb..fa9d921f933 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -364,6 +364,8 @@ VRSHRI_U          111 1 1111 1 . ... ... ... 0 0010 0 1 . 1 ... 0 @2_shr_h
 VRSHRI_U          111 1 1111 1 . ... ... ... 0 0010 0 1 . 1 ... 0 @2_shr_w
 
 # VSHLL T1 encoding; the T2 VSHLL encoding is elsewhere in this file
+# Note that VMOVL is encoded as "VSHLL with a zero shift count"; we
+# implement it that way rather than special-casing it in the decode.
 VSHLL_BS          111 0 1110 1 . 1 .. ... ... 0 1111 0 1 . 0 ... 0 @2_shll_b
 VSHLL_BS          111 0 1110 1 . 1 .. ... ... 0 1111 0 1 . 0 ... 0 @2_shll_h
 
-- 
2.20.1

[PATCH for-6.2 02/34] target/arm: Print MVE VPR in CPU dumps

[Peter Maydell]

Include the MVE VPR register value in the CPU dumps produced by
arm_cpu_dump_state() if we are printing FPU information. This
makes it easier to interpret debug logs when predication is
active.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/cpu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 9cddfd6a442..6d6b8888037 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -1016,6 +1016,9 @@ static void arm_cpu_dump_state(CPUState *cs, FILE *f, int flags)
                          i, v);
         }
         qemu_fprintf(f, "FPSCR: %08x\n", vfp_get_fpscr(env));
+        if (cpu_isar_feature(aa32_mve, cpu)) {
+            qemu_fprintf(f, "VPR: %08x\n", env->v7m.vpr);
+        }
     }
 }
 
-- 
2.20.1

[PATCH for-6.2 03/34] target/arm: Fix MVE VSLI by 0 and VSRI by <dt>

[Peter Maydell]

In the MVE shift-and-insert insns, we special case VSLI by 0
and VSRI by <dt>, both of which mean "no shift". However we
incorrectly implemented these as "don't update the destination",
which works only if Qd == Qm. When Qd != Qm this kind of
shift must update Qd, honouring the predicate mask.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index db5d6220854..16a701933b8 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1276,19 +1276,23 @@ DO_2SHIFT_S(vrshli_s, DO_VRSHLS)
                                 void *vm, uint32_t shift)               \
     {                                                                   \
         uint64_t *d = vd, *m = vm;                                      \
-        uint16_t mask;                                                  \
+        uint16_t mask = mve_element_mask(env);                          \
         uint64_t shiftmask;                                             \
         unsigned e;                                                     \
         if (shift == 0 || shift == ESIZE * 8) {                         \
             /*                                                          \
              * Only VSLI can shift by 0; only VSRI can shift by <dt>.   \
              * The generic logic would give the right answer for 0 but  \
-             * fails for <dt>.                                          \
+             * fails for <dt>. In both cases, we must not shift the     \
+             * input but just copy it to the destination, honouring     \
+             * the predicate mask.                                      \
              */                                                         \
+            for (e = 0; e < 16 / 8; e++, mask >>= 8) {                  \
+                mergemask(&d[H8(e)], m[H8(e)], mask);                   \
+            }                                                           \
             goto done;                                                  \
         }                                                               \
         assert(shift < ESIZE * 8);                                      \
-        mask = mve_element_mask(env);                                   \
         /* ESIZE / 2 gives the MO_* value if ESIZE is in [1,2,4] */     \
         shiftmask = dup_const(ESIZE / 2, MASKFN(ESIZE * 8, shift));     \
         for (e = 0; e < 16 / 8; e++, mask >>= 8) {                      \
-- 
2.20.1

[PATCH for-6.2 04/34] target/arm: Fix signed VADDV

[Peter Maydell]

A cut-and-paste error meant we handled signed VADDV like
unsigned VADDV; fix the type used.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 16a701933b8..99b4801088f 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1182,9 +1182,9 @@ DO_LDAVH(vrmlsldavhxsw, int32_t, int64_t, true, true)
         return ra;                                              \
     }                                                           \
 
-DO_VADDV(vaddvsb, 1, uint8_t)
-DO_VADDV(vaddvsh, 2, uint16_t)
-DO_VADDV(vaddvsw, 4, uint32_t)
+DO_VADDV(vaddvsb, 1, int8_t)
+DO_VADDV(vaddvsh, 2, int16_t)
+DO_VADDV(vaddvsw, 4, int32_t)
 DO_VADDV(vaddvub, 1, uint8_t)
 DO_VADDV(vaddvuh, 2, uint16_t)
 DO_VADDV(vaddvuw, 4, uint32_t)
-- 
2.20.1

[PATCH for-6.2 05/34] target/arm: Fix mask handling for MVE narrowing operations

[Peter Maydell]

In the MVE helpers for the narrowing operations (DO_VSHRN and
DO_VSHRN_SAT) we were using the wrong bits of the predicate mask for
the 'top' versions of the insn.  This is because the loop works over
the double-sized input elements and shifts the predicate mask by that
many bits each time, but when we write out the half-sized output we
must look at the mask bits for whichever half of the element we are
writing to.

Correct this by shifting the whole mask right by ESIZE bits for the
'top' insns.  This allows us also to simplify the saturation bit
checking (where we had noticed that we needed to look at a different
mask bit for the 'top' insn.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 99b4801088f..8cbfd3a8c53 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1361,6 +1361,7 @@ DO_VSHLL_ALL(vshllt, true)
         TYPE *d = vd;                                           \
         uint16_t mask = mve_element_mask(env);                  \
         unsigned le;                                            \
+        mask >>= ESIZE * TOP;                                   \
         for (le = 0; le < 16 / LESIZE; le++, mask >>= LESIZE) { \
             TYPE r = FN(m[H##LESIZE(le)], shift);               \
             mergemask(&d[H##ESIZE(le * 2 + TOP)], r, mask);     \
@@ -1422,11 +1423,12 @@ static inline int32_t do_sat_bhs(int64_t val, int64_t min, int64_t max,
         uint16_t mask = mve_element_mask(env);                  \
         bool qc = false;                                        \
         unsigned le;                                            \
+        mask >>= ESIZE * TOP;                                   \
         for (le = 0; le < 16 / LESIZE; le++, mask >>= LESIZE) { \
             bool sat = false;                                   \
             TYPE r = FN(m[H##LESIZE(le)], shift, &sat);         \
             mergemask(&d[H##ESIZE(le * 2 + TOP)], r, mask);     \
-            qc |= sat && (mask & 1 << (TOP * ESIZE));           \
+            qc |= sat & mask & 1;                               \
         }                                                       \
         if (qc) {                                               \
             env->vfp.qc[0] = qc;                                \
-- 
2.20.1

[PATCH for-6.2 06/34] target/arm: Fix 48-bit saturating shifts

[Peter Maydell]

In do_sqrshl48_d() and do_uqrshl48_d() we got some of the edge
cases wrong and failed to saturate correctly:

(1) In do_sqrshl48_d() we used the same code that do_shrshl_bhs()
does to obtain the saturated most-negative and most-positive 48-bit
signed values for the large-shift-left case.  This gives (1 << 47)
for saturate-to-most-negative, but we weren't sign-extending this
value to the 64-bit output as the pseudocode requires.

(2) For left shifts by less than 48, we copied the "8/16 bit" code
from do_sqrshl_bhs() and do_uqrshl_bhs().  This doesn't do the right
thing because it assumes the C type we're working with is at least
twice the number of bits we're saturating to (so that a shift left by
bits-1 can't shift anything off the top of the value).  This isn't
true for bits == 48, so we would incorrectly return 0 rather than the
most-positive value for situations like "shift (1 << 44) right by
20".  Instead check for saturation by doing the shift and signextend
and then testing whether shifting back left again gives the original
value.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 8cbfd3a8c53..f17e5a413fd 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1579,9 +1579,8 @@ static inline int64_t do_sqrshl48_d(int64_t src, int64_t shift,
         }
         return src >> -shift;
     } else if (shift < 48) {
-        int64_t val = src << shift;
-        int64_t extval = sextract64(val, 0, 48);
-        if (!sat || val == extval) {
+        int64_t extval = sextract64(src << shift, 0, 48);
+        if (!sat || src == (extval >> shift)) {
             return extval;
         }
     } else if (!sat || src == 0) {
@@ -1589,7 +1588,7 @@ static inline int64_t do_sqrshl48_d(int64_t src, int64_t shift,
     }
 
     *sat = 1;
-    return (1ULL << 47) - (src >= 0);
+    return sextract64((1ULL << 47) - (src >= 0), 0, 48);
 }
 
 /* Operate on 64-bit values, but saturate at 48 bits */
@@ -1612,9 +1611,8 @@ static inline uint64_t do_uqrshl48_d(uint64_t src, int64_t shift,
             return extval;
         }
     } else if (shift < 48) {
-        uint64_t val = src << shift;
-        uint64_t extval = extract64(val, 0, 48);
-        if (!sat || val == extval) {
+        uint64_t extval = extract64(src << shift, 0, 48);
+        if (!sat || src == (extval >> shift)) {
             return extval;
         }
     } else if (!sat || src == 0) {
-- 
2.20.1

[PATCH for-6.2 07/34] target/arm: Fix calculation of LTP mask when LR is 0

[Peter Maydell]

In mve_element_mask(), we calculate a mask for tail predication which
should have a number of 1 bits based on the value of LR.  However,
our MAKE_64BIT_MASK() macro has undefined behaviour when passed a
zero length.  Special case this to give the all-zeroes mask we
require.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index f17e5a413fd..c75432c5fef 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -64,7 +64,8 @@ static uint16_t mve_element_mask(CPUARMState *env)
          */
         int masklen = env->regs[14] << env->v7m.ltpsize;
         assert(masklen <= 16);
-        mask &= MAKE_64BIT_MASK(0, masklen);
+        uint16_t ltpmask = masklen ? MAKE_64BIT_MASK(0, masklen) : 0;
+        mask &= ltpmask;
     }
 
     if ((env->condexec_bits & 0xf) == 0) {
-- 
2.20.1

[PATCH for-6.2 08/34] target/arm: Fix VPT advance when ECI is non-zero

[Peter Maydell]

We were not paying attention to the ECI state when advancing the VPT
state.  Architecturally, VPT state advance happens for every beat
(see the pseudocode VPTAdvance()), so on every beat the 4 bits of
VPR.P0 corresponding to the current beat are inverted if required,
and at the end of beats 1 and 3 the VPR MASK fields are updated.
This means that if the ECI state says we should not be executing all
4 beats then we need to skip some of the updating of the VPR that we
currently do in mve_advance_vpt().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index c75432c5fef..b111ba3b106 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -100,9 +100,11 @@ static void mve_advance_vpt(CPUARMState *env)
     /* Advance the VPT and ECI state if necessary */
     uint32_t vpr = env->v7m.vpr;
     unsigned mask01, mask23;
+    int eci = ECI_NONE;
 
     if ((env->condexec_bits & 0xf) == 0) {
-        env->condexec_bits = (env->condexec_bits == (ECI_A0A1A2B0 << 4)) ?
+        eci = env->condexec_bits >> 4;
+        env->condexec_bits = (eci == ECI_A0A1A2B0) ?
             (ECI_A0 << 4) : (ECI_NONE << 4);
     }
 
@@ -111,17 +113,32 @@ static void mve_advance_vpt(CPUARMState *env)
         return;
     }
 
+    /* Invert P0 bits if needed, but only for beats we actually executed */
     mask01 = FIELD_EX32(vpr, V7M_VPR, MASK01);
     mask23 = FIELD_EX32(vpr, V7M_VPR, MASK23);
     if (mask01 > 8) {
-        /* high bit set, but not 0b1000: invert the relevant half of P0 */
-        vpr ^= 0xff;
+        if (eci == ECI_NONE) {
+            /* high bit set, but not 0b1000: invert the relevant half of P0 */
+            vpr ^= 0xff;
+        } else if (eci == ECI_A0) {
+            /* Invert only the beat 1 P0 bits, as we didn't execute beat 0 */
+            vpr ^= 0xf0;
+        } /* otherwise we didn't execute either beat 0 or beat 1 */
     }
     if (mask23 > 8) {
-        /* high bit set, but not 0b1000: invert the relevant half of P0 */
-        vpr ^= 0xff00;
+        if (eci != ECI_A0A1A2 && eci != ECI_A0A1A2B0) {
+            /* high bit set, but not 0b1000: invert the relevant half of P0 */
+            vpr ^= 0xff00;
+        } else {
+            /* We didn't execute beat 2, only invert the beat 3 P0 bits */
+            vpr ^= 0xf000;
+        }
     }
-    vpr = FIELD_DP32(vpr, V7M_VPR, MASK01, mask01 << 1);
+    /* Only update MASK01 if beat 1 executed */
+    if (eci == ECI_NONE || eci == ECI_A0) {
+        vpr = FIELD_DP32(vpr, V7M_VPR, MASK01, mask01 << 1);
+    }
+    /* Beat 3 always executes, so update MASK23 */
     vpr = FIELD_DP32(vpr, V7M_VPR, MASK23, mask23 << 1);
     env->v7m.vpr = vpr;
 }
-- 
2.20.1

[PATCH for-6.2 09/34] target/arm: Factor out mve_eci_mask()

[Peter Maydell]

In some situations we need a mask telling us which parts of the
vector correspond to beats that are not being executed because of
ECI, separately from the combined "which bytes are predicated away"
mask.  Factor this mask calculation out of mve_element_mask() into
its own function.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 58 ++++++++++++++++++++++++-----------------
 1 file changed, 34 insertions(+), 24 deletions(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index b111ba3b106..b0cbfda3cce 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -26,6 +26,35 @@
 #include "exec/exec-all.h"
 #include "tcg/tcg.h"
 
+static uint16_t mve_eci_mask(CPUARMState *env)
+{
+    /*
+     * Return the mask of which elements in the MVE vector correspond
+     * to beats being executed. The mask has 1 bits for executed lanes
+     * and 0 bits where ECI says this beat was already executed.
+     */
+    int eci;
+
+    if ((env->condexec_bits & 0xf) != 0) {
+        return 0xffff;
+    }
+
+    eci = env->condexec_bits >> 4;
+    switch (eci) {
+    case ECI_NONE:
+        return 0xffff;
+    case ECI_A0:
+        return 0xfff0;
+    case ECI_A0A1:
+        return 0xff00;
+    case ECI_A0A1A2:
+    case ECI_A0A1A2B0:
+        return 0xf000;
+    default:
+        g_assert_not_reached();
+    }
+}
+
 static uint16_t mve_element_mask(CPUARMState *env)
 {
     /*
@@ -68,30 +97,11 @@ static uint16_t mve_element_mask(CPUARMState *env)
         mask &= ltpmask;
     }
 
-    if ((env->condexec_bits & 0xf) == 0) {
-        /*
-         * ECI bits indicate which beats are already executed;
-         * we handle this by effectively predicating them out.
-         */
-        int eci = env->condexec_bits >> 4;
-        switch (eci) {
-        case ECI_NONE:
-            break;
-        case ECI_A0:
-            mask &= 0xfff0;
-            break;
-        case ECI_A0A1:
-            mask &= 0xff00;
-            break;
-        case ECI_A0A1A2:
-        case ECI_A0A1A2B0:
-            mask &= 0xf000;
-            break;
-        default:
-            g_assert_not_reached();
-        }
-    }
-
+    /*
+     * ECI bits indicate which beats are already executed;
+     * we handle this by effectively predicating them out.
+     */
+    mask &= mve_eci_mask(env);
     return mask;
 }
 
-- 
2.20.1

[PATCH for-6.2 10/34] target/arm: Fix VLDRB/H/W for predicated elements

[Peter Maydell]

For vector loads, predicated elements are zeroed, instead of
retaining their previous values (as happens for most data
processing operations). This means we need to distinguish
"beat not executed due to ECI" (don't touch destination
element) from "beat executed but predicated out" (zero
destination element).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/mve_helper.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index b0cbfda3cce..f78228f70c1 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -153,12 +153,13 @@ static void mve_advance_vpt(CPUARMState *env)
     env->v7m.vpr = vpr;
 }
 
-
+/* For loads, predicated lanes are zeroed instead of keeping their old values */
 #define DO_VLDR(OP, MSIZE, LDTYPE, ESIZE, TYPE)                         \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, uint32_t addr)    \
     {                                                                   \
         TYPE *d = vd;                                                   \
         uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
         unsigned b, e;                                                  \
         /*                                                              \
          * R_SXTM allows the dest reg to become UNKNOWN for abandoned   \
@@ -166,8 +167,9 @@ static void mve_advance_vpt(CPUARMState *env)
          * then take an exception.                                      \
          */                                                             \
         for (b = 0, e = 0; b < 16; b += ESIZE, e++) {                   \
-            if (mask & (1 << b)) {                                      \
-                d[H##ESIZE(e)] = cpu_##LDTYPE##_data_ra(env, addr, GETPC()); \
+            if (eci_mask & (1 << b)) {                                  \
+                d[H##ESIZE(e)] = (mask & (1 << b)) ?                    \
+                    cpu_##LDTYPE##_data_ra(env, addr, GETPC()) : 0;     \
             }                                                           \
             addr += MSIZE;                                              \
         }                                                               \
-- 
2.20.1

[PATCH for-6.2 11/34] target/arm: Implement MVE VMULL (polynomial)

[Peter Maydell]

Implement the MVE VMULL (polynomial) insn.  Unlike Neon, this comes
in two flavours: 8x8->16 and a 16x16->32.  Also unlike Neon, the
inputs are in either the low or the high half of each double-width
element.

The assembler for this insn indicates the size with "P8" or "P16",
encoded into bit 28 as size = 0 or 1. We choose to follow the
same encoding as VQDMULL and decode this into a->size as MO_16
or MO_32 indicating the size of the result elements. This then
carries through to the helper function names where it then
matches up with the existing pmull_h() which does an 8x8->16
operation and a new pmull_w() which does the 16x16->32.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  5 +++++
 target/arm/vec_internal.h  | 11 +++++++++++
 target/arm/mve.decode      | 14 ++++++++++----
 target/arm/mve_helper.c    | 16 ++++++++++++++++
 target/arm/translate-mve.c | 28 ++++++++++++++++++++++++++++
 target/arm/vec_helper.c    | 14 +++++++++++++-
 6 files changed, 83 insertions(+), 5 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 56e40844ad9..84adfb21517 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -145,6 +145,11 @@ DEF_HELPER_FLAGS_4(mve_vmulltub, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vmulltuh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vmulltuw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 
+DEF_HELPER_FLAGS_4(mve_vmullpbh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
+DEF_HELPER_FLAGS_4(mve_vmullpth, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
+DEF_HELPER_FLAGS_4(mve_vmullpbw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
+DEF_HELPER_FLAGS_4(mve_vmullptw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
+
 DEF_HELPER_FLAGS_4(mve_vqdmulhb, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vqdmulhh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vqdmulhw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
diff --git a/target/arm/vec_internal.h b/target/arm/vec_internal.h
index 865d2139447..2a335582906 100644
--- a/target/arm/vec_internal.h
+++ b/target/arm/vec_internal.h
@@ -206,4 +206,15 @@ int16_t do_sqrdmlah_h(int16_t, int16_t, int16_t, bool, bool, uint32_t *);
 int32_t do_sqrdmlah_s(int32_t, int32_t, int32_t, bool, bool, uint32_t *);
 int64_t do_sqrdmlah_d(int64_t, int64_t, int64_t, bool, bool);
 
+/*
+ * 8 x 8 -> 16 vector polynomial multiply where the inputs are
+ * in the low 8 bits of each 16-bit element
+*/
+uint64_t pmull_h(uint64_t op1, uint64_t op2);
+/*
+ * 16 x 16 -> 32 vector polynomial multiply where the inputs are
+ * in the low 16 bits of each 32-bit element
+ */
+uint64_t pmull_w(uint64_t op1, uint64_t op2);
+
 #endif /* TARGET_ARM_VEC_INTERNALS_H */
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index fa9d921f933..de079ec517d 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -173,10 +173,16 @@ VHADD_U          111 1 1111 0 . .. ... 0 ... 0 0000 . 1 . 0 ... 0 @2op
 VHSUB_S          111 0 1111 0 . .. ... 0 ... 0 0010 . 1 . 0 ... 0 @2op
 VHSUB_U          111 1 1111 0 . .. ... 0 ... 0 0010 . 1 . 0 ... 0 @2op
 
-VMULL_BS         111 0 1110 0 . .. ... 1 ... 0 1110 . 0 . 0 ... 0 @2op
-VMULL_BU         111 1 1110 0 . .. ... 1 ... 0 1110 . 0 . 0 ... 0 @2op
-VMULL_TS         111 0 1110 0 . .. ... 1 ... 1 1110 . 0 . 0 ... 0 @2op
-VMULL_TU         111 1 1110 0 . .. ... 1 ... 1 1110 . 0 . 0 ... 0 @2op
+{
+  VMULLP_B       111 . 1110 0 . 11 ... 1 ... 0 1110 . 0 . 0 ... 0 @2op_sz28
+  VMULL_BS       111 0 1110 0 . .. ... 1 ... 0 1110 . 0 . 0 ... 0 @2op
+  VMULL_BU       111 1 1110 0 . .. ... 1 ... 0 1110 . 0 . 0 ... 0 @2op
+}
+{
+  VMULLP_T       111 . 1110 0 . 11 ... 1 ... 1 1110 . 0 . 0 ... 0 @2op_sz28
+  VMULL_TS       111 0 1110 0 . .. ... 1 ... 1 1110 . 0 . 0 ... 0 @2op
+  VMULL_TU       111 1 1110 0 . .. ... 1 ... 1 1110 . 0 . 0 ... 0 @2op
+}
 
 VQDMULH          1110 1111 0 . .. ... 0 ... 0 1011 . 1 . 0 ... 0 @2op
 VQRDMULH         1111 1111 0 . .. ... 0 ... 0 1011 . 1 . 0 ... 0 @2op
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index f78228f70c1..db5ec9266d1 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -488,6 +488,22 @@ DO_2OP_L(vmulltub, 1, 1, uint8_t, 2, uint16_t, DO_MUL)
 DO_2OP_L(vmulltuh, 1, 2, uint16_t, 4, uint32_t, DO_MUL)
 DO_2OP_L(vmulltuw, 1, 4, uint32_t, 8, uint64_t, DO_MUL)
 
+/*
+ * Polynomial multiply. We can always do this generating 64 bits
+ * of the result at a time, so we don't need to use DO_2OP_L.
+ */
+#define VMULLPH_MASK 0x00ff00ff00ff00ffULL
+#define VMULLPW_MASK 0x0000ffff0000ffffULL
+#define DO_VMULLPBH(N, M) pmull_h((N) & VMULLPH_MASK, (M) & VMULLPH_MASK)
+#define DO_VMULLPTH(N, M) DO_VMULLPBH((N) >> 8, (M) >> 8)
+#define DO_VMULLPBW(N, M) pmull_w((N) & VMULLPW_MASK, (M) & VMULLPW_MASK)
+#define DO_VMULLPTW(N, M) DO_VMULLPBW((N) >> 16, (M) >> 16)
+
+DO_2OP(vmullpbh, 8, uint64_t, DO_VMULLPBH)
+DO_2OP(vmullpth, 8, uint64_t, DO_VMULLPTH)
+DO_2OP(vmullpbw, 8, uint64_t, DO_VMULLPBW)
+DO_2OP(vmullptw, 8, uint64_t, DO_VMULLPTW)
+
 /*
  * Because the computation type is at least twice as large as required,
  * these work for both signed and unsigned source types.
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index a2a45036a0b..d318f34b2bc 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -464,6 +464,34 @@ static bool trans_VQDMULLT(DisasContext *s, arg_2op *a)
     return do_2op(s, a, fns[a->size]);
 }
 
+static bool trans_VMULLP_B(DisasContext *s, arg_2op *a)
+{
+    /*
+     * Note that a->size indicates the output size, ie VMULL.P8
+     * is the 8x8->16 operation and a->size is MO_16; VMULL.P16
+     * is the 16x16->32 operation and a->size is MO_32.
+     */
+    static MVEGenTwoOpFn * const fns[] = {
+        NULL,
+        gen_helper_mve_vmullpbh,
+        gen_helper_mve_vmullpbw,
+        NULL,
+    };
+    return do_2op(s, a, fns[a->size]);
+}
+
+static bool trans_VMULLP_T(DisasContext *s, arg_2op *a)
+{
+    /* a->size is as for trans_VMULLP_B */
+    static MVEGenTwoOpFn * const fns[] = {
+        NULL,
+        gen_helper_mve_vmullpth,
+        gen_helper_mve_vmullptw,
+        NULL,
+    };
+    return do_2op(s, a, fns[a->size]);
+}
+
 /*
  * VADC and VSBC: these perform an add-with-carry or subtract-with-carry
  * of the 32-bit elements in each lane of the input vectors, where the
diff --git a/target/arm/vec_helper.c b/target/arm/vec_helper.c
index 034f6b84f78..17fb1583622 100644
--- a/target/arm/vec_helper.c
+++ b/target/arm/vec_helper.c
@@ -2028,11 +2028,23 @@ static uint64_t expand_byte_to_half(uint64_t x)
          | ((x & 0xff000000) << 24);
 }
 
-static uint64_t pmull_h(uint64_t op1, uint64_t op2)
+uint64_t pmull_w(uint64_t op1, uint64_t op2)
 {
     uint64_t result = 0;
     int i;
+    for (i = 0; i < 16; ++i) {
+        uint64_t mask = (op1 & 0x0000000100000001ull) * 0xffffffff;
+        result ^= op2 & mask;
+        op1 >>= 1;
+        op2 <<= 1;
+    }
+    return result;
+}
 
+uint64_t pmull_h(uint64_t op1, uint64_t op2)
+{
+    uint64_t result = 0;
+    int i;
     for (i = 0; i < 8; ++i) {
         uint64_t mask = (op1 & 0x0001000100010001ull) * 0xffff;
         result ^= op2 & mask;
-- 
2.20.1

[PATCH for-6.2 12/34] target/arm: Implement MVE incrementing/decrementing dup insns

[Peter Maydell]

Implement the MVE incrementing/decrementing dup insns VIDUP, VDDUP,
VIWDUP and VDWDUP.  These fill the elements of a vector with
successively incrementing values, starting at the offset specified in
a general purpose register.  The final value of the offset is written
back to this register.  The wrapping variants take a second general
purpose register which specifies the point where the count should
wrap back to 0.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  16 +++++
 target/arm/mve.decode      |  25 ++++++++
 target/arm/mve_helper.c    |  64 ++++++++++++++++++++
 target/arm/translate-mve.c | 118 +++++++++++++++++++++++++++++++++++++
 4 files changed, 223 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 84adfb21517..54b252e98af 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -35,6 +35,22 @@ DEF_HELPER_FLAGS_3(mve_vstrh_w, TCG_CALL_NO_WG, void, env, ptr, i32)
 
 DEF_HELPER_FLAGS_3(mve_vdup, TCG_CALL_NO_WG, void, env, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vidupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
+DEF_HELPER_FLAGS_4(mve_viduph, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
+DEF_HELPER_FLAGS_4(mve_vidupw, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
+
+DEF_HELPER_FLAGS_4(mve_vddupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
+DEF_HELPER_FLAGS_4(mve_vdduph, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
+DEF_HELPER_FLAGS_4(mve_vddupw, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
+
+DEF_HELPER_FLAGS_5(mve_viwdupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32, i32)
+DEF_HELPER_FLAGS_5(mve_viwduph, TCG_CALL_NO_WG, i32, env, ptr, i32, i32, i32)
+DEF_HELPER_FLAGS_5(mve_viwdupw, TCG_CALL_NO_WG, i32, env, ptr, i32, i32, i32)
+
+DEF_HELPER_FLAGS_5(mve_vdwdupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32, i32)
+DEF_HELPER_FLAGS_5(mve_vdwduph, TCG_CALL_NO_WG, i32, env, ptr, i32, i32, i32)
+DEF_HELPER_FLAGS_5(mve_vdwdupw, TCG_CALL_NO_WG, i32, env, ptr, i32, i32, i32)
+
 DEF_HELPER_FLAGS_3(mve_vclsb, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vclsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vclsw, TCG_CALL_NO_WG, void, env, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index de079ec517d..88c9c18ebf1 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -35,6 +35,8 @@
 &2scalar qd qn rm size
 &1imm qd imm cmode op
 &2shift qd qm shift size
+&vidup qd rn size imm
+&viwdup qd rn rm size imm
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
@@ -259,6 +261,29 @@ VDUP             1110 1110 1 1 10 ... 0 .... 1011 . 0 0 1 0000 @vdup size=0
 VDUP             1110 1110 1 0 10 ... 0 .... 1011 . 0 1 1 0000 @vdup size=1
 VDUP             1110 1110 1 0 10 ... 0 .... 1011 . 0 0 1 0000 @vdup size=2
 
+# Incrementing and decrementing dup
+
+# VIDUP, VDDUP format immediate: 1 << (immh:imml)
+%imm_vidup 7:1 0:1 !function=vidup_imm
+
+# VIDUP, VDDUP registers: Rm bits [3:1] from insn, bit 0 is 1;
+# Rn bits [3:1] from insn, bit 0 is 0
+%vidup_rm 1:3 !function=times_2_plus_1
+%vidup_rn 17:3 !function=times_2
+
+@vidup           .... .... . . size:2 .... .... .... .... .... \
+                 qd=%qd imm=%imm_vidup rn=%vidup_rn &vidup
+@viwdup          .... .... . . size:2 .... .... .... .... .... \
+                 qd=%qd imm=%imm_vidup rm=%vidup_rm rn=%vidup_rn &viwdup
+{
+  VIDUP          1110 1110 0 . .. ... 1 ... 0 1111 . 110 111 . @vidup
+  VIWDUP         1110 1110 0 . .. ... 1 ... 0 1111 . 110 ... . @viwdup
+}
+{
+  VDDUP          1110 1110 0 . .. ... 1 ... 1 1111 . 110 111 . @vidup
+  VDWDUP         1110 1110 0 . .. ... 1 ... 1 1111 . 110 ... . @viwdup
+}
+
 # multiply-add long dual accumulate
 # rdahi: bits [3:1] from insn, bit 0 is 1
 # rdalo: bits [3:1] from insn, bit 0 is 0
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index db5ec9266d1..0ef5f5d8871 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1698,3 +1698,67 @@ uint32_t HELPER(mve_sqrshr)(CPUARMState *env, uint32_t n, uint32_t shift)
 {
     return do_sqrshl_bhs(n, -(int8_t)shift, 32, true, &env->QF);
 }
+
+#define DO_VIDUP(OP, ESIZE, TYPE, FN)                           \
+    uint32_t HELPER(mve_##OP)(CPUARMState *env, void *vd,       \
+                           uint32_t offset, uint32_t imm)       \
+    {                                                           \
+        TYPE *d = vd;                                           \
+        uint16_t mask = mve_element_mask(env);                  \
+        unsigned e;                                             \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
+            mergemask(&d[H##ESIZE(e)], offset, mask);           \
+            offset = FN(offset, imm);                           \
+        }                                                       \
+        mve_advance_vpt(env);                                   \
+        return offset;                                          \
+    }
+
+#define DO_VIWDUP(OP, ESIZE, TYPE, FN)                          \
+    uint32_t HELPER(mve_##OP)(CPUARMState *env, void *vd,       \
+                              uint32_t offset, uint32_t wrap,   \
+                              uint32_t imm)                     \
+    {                                                           \
+        TYPE *d = vd;                                           \
+        uint16_t mask = mve_element_mask(env);                  \
+        unsigned e;                                             \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
+            mergemask(&d[H##ESIZE(e)], offset, mask);           \
+            offset = FN(offset, wrap, imm);                     \
+        }                                                       \
+        mve_advance_vpt(env);                                   \
+        return offset;                                          \
+    }
+
+#define DO_VIDUP_ALL(OP, FN)                    \
+    DO_VIDUP(OP##b, 1, int8_t, FN)              \
+    DO_VIDUP(OP##h, 2, int16_t, FN)             \
+    DO_VIDUP(OP##w, 4, int32_t, FN)
+
+#define DO_VIWDUP_ALL(OP, FN)                   \
+    DO_VIWDUP(OP##b, 1, int8_t, FN)             \
+    DO_VIWDUP(OP##h, 2, int16_t, FN)            \
+    DO_VIWDUP(OP##w, 4, int32_t, FN)
+
+static uint32_t do_add_wrap(uint32_t offset, uint32_t wrap, uint32_t imm)
+{
+    offset += imm;
+    if (offset == wrap) {
+        offset = 0;
+    }
+    return offset;
+}
+
+static uint32_t do_sub_wrap(uint32_t offset, uint32_t wrap, uint32_t imm)
+{
+    if (offset == 0) {
+        offset = wrap;
+    }
+    offset -= imm;
+    return offset;
+}
+
+DO_VIDUP_ALL(vidup, DO_ADD)
+DO_VIDUP_ALL(vddup, DO_SUB)
+DO_VIWDUP_ALL(viwdup, do_add_wrap)
+DO_VIWDUP_ALL(vdwdup, do_sub_wrap)
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index d318f34b2bc..52400864692 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -25,6 +25,11 @@
 #include "translate.h"
 #include "translate-a32.h"
 
+static inline int vidup_imm(DisasContext *s, int x)
+{
+    return 1 << x;
+}
+
 /* Include the generated decoder */
 #include "decode-mve.c.inc"
 
@@ -36,6 +41,8 @@ typedef void MVEGenTwoOpShiftFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenDualAccOpFn(TCGv_i64, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i64);
 typedef void MVEGenVADDVFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenOneOpImmFn(TCGv_ptr, TCGv_ptr, TCGv_i64);
+typedef void MVEGenVIDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32);
+typedef void MVEGenVIWDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32, TCGv_i32);
 
 /* Return the offset of a Qn register (same semantics as aa32_vfp_qreg()) */
 static inline long mve_qreg_offset(unsigned reg)
@@ -1059,3 +1066,114 @@ static bool trans_VSHLC(DisasContext *s, arg_VSHLC *a)
     mve_update_eci(s);
     return true;
 }
+
+static bool do_vidup(DisasContext *s, arg_vidup *a, MVEGenVIDUPFn *fn)
+{
+    TCGv_ptr qd;
+    TCGv_i32 rn;
+
+    /*
+     * Vector increment/decrement with wrap and duplicate (VIDUP, VDDUP).
+     * This fills the vector with elements of successively increasing
+     * or decreasing values, starting from Rn.
+     */
+    if (!dc_isar_feature(aa32_mve, s) || !mve_check_qreg_bank(s, a->qd)) {
+        return false;
+    }
+    if (a->size == MO_64) {
+        /* size 0b11 is another encoding */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qd = mve_qreg_ptr(a->qd);
+    rn = load_reg(s, a->rn);
+    fn(rn, cpu_env, qd, rn, tcg_constant_i32(a->imm));
+    store_reg(s, a->rn, rn);
+    tcg_temp_free_ptr(qd);
+    mve_update_eci(s);
+    return true;
+}
+
+static bool do_viwdup(DisasContext *s, arg_viwdup *a, MVEGenVIWDUPFn *fn)
+{
+    TCGv_ptr qd;
+    TCGv_i32 rn, rm;
+
+    /*
+     * Vector increment/decrement with wrap and duplicate (VIWDUp, VDWDUP)
+     * This fills the vector with elements of successively increasing
+     * or decreasing values, starting from Rn. Rm specifies a point where
+     * the count wraps back around to 0. The updated offset is written back
+     * to Rn.
+     */
+    if (!dc_isar_feature(aa32_mve, s) || !mve_check_qreg_bank(s, a->qd)) {
+        return false;
+    }
+    if (!fn || a->rm == 13 || a->rm == 15) {
+        /*
+         * size 0b11 is another encoding; Rm == 13 is UNPREDICTABLE;
+         * Rm == 13 is VIWDUP, VDWDUP.
+         */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qd = mve_qreg_ptr(a->qd);
+    rn = load_reg(s, a->rn);
+    rm = load_reg(s, a->rm);
+    fn(rn, cpu_env, qd, rn, rm, tcg_constant_i32(a->imm));
+    store_reg(s, a->rn, rn);
+    tcg_temp_free_ptr(qd);
+    tcg_temp_free_i32(rm);
+    mve_update_eci(s);
+    return true;
+}
+
+static bool trans_VIDUP(DisasContext *s, arg_vidup *a)
+{
+    static MVEGenVIDUPFn * const fns[] = {
+        gen_helper_mve_vidupb,
+        gen_helper_mve_viduph,
+        gen_helper_mve_vidupw,
+        NULL,
+    };
+    return do_vidup(s, a, fns[a->size]);
+}
+
+static bool trans_VDDUP(DisasContext *s, arg_vidup *a)
+{
+    static MVEGenVIDUPFn * const fns[] = {
+        gen_helper_mve_vddupb,
+        gen_helper_mve_vdduph,
+        gen_helper_mve_vddupw,
+        NULL,
+    };
+    return do_vidup(s, a, fns[a->size]);
+}
+
+static bool trans_VIWDUP(DisasContext *s, arg_viwdup *a)
+{
+    static MVEGenVIWDUPFn * const fns[] = {
+        gen_helper_mve_viwdupb,
+        gen_helper_mve_viwduph,
+        gen_helper_mve_viwdupw,
+        NULL,
+    };
+    return do_viwdup(s, a, fns[a->size]);
+}
+
+static bool trans_VDWDUP(DisasContext *s, arg_viwdup *a)
+{
+    static MVEGenVIWDUPFn * const fns[] = {
+        gen_helper_mve_vdwdupb,
+        gen_helper_mve_vdwduph,
+        gen_helper_mve_vdwdupw,
+        NULL,
+    };
+    return do_viwdup(s, a, fns[a->size]);
+}
-- 
2.20.1

[PATCH for-6.2 13/34] target/arm: Factor out gen_vpst()

[Peter Maydell]

Factor out the "generate code to update VPR.MASK01/MASK23" part of
trans_VPST(); we are going to want to reuse it for the VPT insns.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/translate-mve.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 52400864692..de65a1c3cf1 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -737,33 +737,24 @@ static bool trans_VRMLSLDAVH(DisasContext *s, arg_vmlaldav *a)
     return do_long_dual_acc(s, a, fns[a->x]);
 }
 
-static bool trans_VPST(DisasContext *s, arg_VPST *a)
+static void gen_vpst(DisasContext *s, uint32_t mask)
 {
-    TCGv_i32 vpr;
-
-    /* mask == 0 is a "related encoding" */
-    if (!dc_isar_feature(aa32_mve, s) || !a->mask) {
-        return false;
-    }
-    if (!mve_eci_check(s) || !vfp_access_check(s)) {
-        return true;
-    }
     /*
      * Set the VPR mask fields. We take advantage of MASK01 and MASK23
      * being adjacent fields in the register.
      *
-     * This insn is not predicated, but it is subject to beat-wise
+     * Updating the masks is not predicated, but it is subject to beat-wise
      * execution, and the mask is updated on the odd-numbered beats.
      * So if PSR.ECI says we should skip beat 1, we mustn't update the
      * 01 mask field.
      */
-    vpr = load_cpu_field(v7m.vpr);
+    TCGv_i32 vpr = load_cpu_field(v7m.vpr);
     switch (s->eci) {
     case ECI_NONE:
     case ECI_A0:
         /* Update both 01 and 23 fields */
         tcg_gen_deposit_i32(vpr, vpr,
-                            tcg_constant_i32(a->mask | (a->mask << 4)),
+                            tcg_constant_i32(mask | (mask << 4)),
                             R_V7M_VPR_MASK01_SHIFT,
                             R_V7M_VPR_MASK01_LENGTH + R_V7M_VPR_MASK23_LENGTH);
         break;
@@ -772,13 +763,25 @@ static bool trans_VPST(DisasContext *s, arg_VPST *a)
     case ECI_A0A1A2B0:
         /* Update only the 23 mask field */
         tcg_gen_deposit_i32(vpr, vpr,
-                            tcg_constant_i32(a->mask),
+                            tcg_constant_i32(mask),
                             R_V7M_VPR_MASK23_SHIFT, R_V7M_VPR_MASK23_LENGTH);
         break;
     default:
         g_assert_not_reached();
     }
     store_cpu_field(vpr, v7m.vpr);
+}
+
+static bool trans_VPST(DisasContext *s, arg_VPST *a)
+{
+    /* mask == 0 is a "related encoding" */
+    if (!dc_isar_feature(aa32_mve, s) || !a->mask) {
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+    gen_vpst(s, a->mask);
     mve_update_and_store_eci(s);
     return true;
 }
-- 
2.20.1

[PATCH for-6.2 14/34] target/arm: Implement MVE integer vector comparisons

[Peter Maydell]

Implement the MVE integer vector comparison instructions.  These are
"VCMP (vector)" encodings T1, T2 and T3, and "VPT (vector)" encodings
T1, T2 and T3.

These insns compare corresponding elements in each vector, and update
the VPR.P0 predicate bits with the results of the comparison.  VPT
also sets the VPR.MASK01 and VPR.MASK23 fields -- it is effectively
"VCMP then VPST".

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 32 ++++++++++++++++++++++
 target/arm/mve.decode      | 18 +++++++++++-
 target/arm/mve_helper.c    | 56 ++++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c | 47 ++++++++++++++++++++++++++++++++
 4 files changed, 152 insertions(+), 1 deletion(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 54b252e98af..e89238eac9d 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -484,3 +484,35 @@ DEF_HELPER_FLAGS_3(mve_uqshl, TCG_CALL_NO_RWG, i32, env, i32, i32)
 DEF_HELPER_FLAGS_3(mve_sqshl, TCG_CALL_NO_RWG, i32, env, i32, i32)
 DEF_HELPER_FLAGS_3(mve_uqrshl, TCG_CALL_NO_RWG, i32, env, i32, i32)
 DEF_HELPER_FLAGS_3(mve_sqrshr, TCG_CALL_NO_RWG, i32, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmpeqb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpeqh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpeqw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpneb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpneh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpnew, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpcsb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpcsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpcsw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmphib, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmphih, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmphiw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpgeb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpgeh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpgew, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpltb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmplth, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpltw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpgtb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpgth, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpgtw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpleb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmpleh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vcmplew, TCG_CALL_NO_WG, void, env, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 88c9c18ebf1..76bbf9a6136 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -37,6 +37,7 @@
 &2shift qd qm shift size
 &vidup qd rn size imm
 &viwdup qd rn rm size imm
+&vcmp qm qn size mask
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
@@ -86,6 +87,10 @@
 @2_shr_w .... .... .. 1 ..... .... .... .... .... &2shift qd=%qd qm=%qm \
          size=2 shift=%rshift_i5
 
+# Vector comparison; 4-bit Qm but 3-bit Qn
+%mask_22_13      22:1 13:3
+@vcmp    .... .... .. size:2 qn:3 . .... .... .... .... &vcmp qm=%qm mask=%mask_22_13
+
 # Vector loads and stores
 
 # Widening loads and narrowing stores:
@@ -345,7 +350,6 @@ VQRDMULH_scalar  1111 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 }
 
 # Predicate operations
-%mask_22_13      22:1 13:3
 VPST             1111 1110 0 . 11 000 1 ... 0 1111 0100 1101 mask=%mask_22_13
 
 # Logical immediate operations (1 reg and modified-immediate)
@@ -458,3 +462,15 @@ VQRSHRUNT         111 1 1110 1 . ... ... ... 1 1111 1 1 . 0 ... 0 @2_shr_b
 VQRSHRUNT         111 1 1110 1 . ... ... ... 1 1111 1 1 . 0 ... 0 @2_shr_h
 
 VSHLC             111 0 1110 1 . 1 imm:5 ... 0 1111 1100 rdm:4 qd=%qd
+
+# Comparisons. We expand out the conditions which are split across
+# encodings T1, T2, T3 and the fc bits. These include VPT, which is
+# effectively "VCMP then VPST". A plain "VCMP" has a mask field of zero.
+VCMPEQ            1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 0 @vcmp
+VCMPNE            1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 0 @vcmp
+VCMPCS            1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 1 @vcmp
+VCMPHI            1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 1 @vcmp
+VCMPGE            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 0 @vcmp
+VCMPLT            1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 0 @vcmp
+VCMPGT            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 1 @vcmp
+VCMPLE            1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 1 @vcmp
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 0ef5f5d8871..23398e86f7d 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1762,3 +1762,59 @@ DO_VIDUP_ALL(vidup, DO_ADD)
 DO_VIDUP_ALL(vddup, DO_SUB)
 DO_VIWDUP_ALL(viwdup, do_add_wrap)
 DO_VIWDUP_ALL(vdwdup, do_sub_wrap)
+
+/*
+ * Vector comparison.
+ * P0 bits for non-executed beats (where eci_mask is 0) are unchanged.
+ * P0 bits for predicated lanes in executed beats (where mask is 0) are 0.
+ * P0 bits otherwise are updated with the results of the comparisons.
+ * We must also keep unchanged the MASK fields at the top of v7m.vpr.
+ */
+#define DO_VCMP(OP, ESIZE, TYPE, FN)                                    \
+    void HELPER(glue(mve_, OP))(CPUARMState *env, void *vn, void *vm)   \
+    {                                                                   \
+        TYPE *n = vn, *m = vm;                                          \
+        uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
+        uint16_t beatpred = 0;                                          \
+        uint16_t emask = MAKE_64BIT_MASK(0, ESIZE);                     \
+        unsigned e;                                                     \
+        for (e = 0; e < 16 / ESIZE; e++) {                              \
+            bool r = FN(n[H##ESIZE(e)], m[H##ESIZE(e)]);                \
+            /* Comparison sets 0/1 bits for each byte in the element */ \
+            beatpred |= r * emask;                                      \
+            emask <<= ESIZE;                                            \
+        }                                                               \
+        beatpred &= mask;                                               \
+        env->v7m.vpr = (env->v7m.vpr & ~(uint32_t)eci_mask) |           \
+            (beatpred & eci_mask);                                      \
+        mve_advance_vpt(env);                                           \
+    }
+
+#define DO_VCMP_S(OP, FN)                       \
+    DO_VCMP(OP##b, 1, int8_t, FN)               \
+    DO_VCMP(OP##h, 2, int16_t, FN)              \
+    DO_VCMP(OP##w, 4, int32_t, FN)
+
+#define DO_VCMP_U(OP, FN)                       \
+    DO_VCMP(OP##b, 1, uint8_t, FN)              \
+    DO_VCMP(OP##h, 2, uint16_t, FN)             \
+    DO_VCMP(OP##w, 4, uint32_t, FN)
+
+#define DO_EQ(N, M) ((N) == (M))
+#define DO_NE(N, M) ((N) != (M))
+#define DO_EQ(N, M) ((N) == (M))
+#define DO_EQ(N, M) ((N) == (M))
+#define DO_GE(N, M) ((N) >= (M))
+#define DO_LT(N, M) ((N) < (M))
+#define DO_GT(N, M) ((N) > (M))
+#define DO_LE(N, M) ((N) <= (M))
+
+DO_VCMP_U(vcmpeq, DO_EQ)
+DO_VCMP_U(vcmpne, DO_NE)
+DO_VCMP_U(vcmpcs, DO_GE)
+DO_VCMP_U(vcmphi, DO_GT)
+DO_VCMP_S(vcmpge, DO_GE)
+DO_VCMP_S(vcmplt, DO_LT)
+DO_VCMP_S(vcmpgt, DO_GT)
+DO_VCMP_S(vcmple, DO_LE)
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index de65a1c3cf1..a7334609e29 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -43,6 +43,7 @@ typedef void MVEGenVADDVFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenOneOpImmFn(TCGv_ptr, TCGv_ptr, TCGv_i64);
 typedef void MVEGenVIDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32);
 typedef void MVEGenVIWDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32, TCGv_i32);
+typedef void MVEGenCmpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
 
 /* Return the offset of a Qn register (same semantics as aa32_vfp_qreg()) */
 static inline long mve_qreg_offset(unsigned reg)
@@ -1180,3 +1181,49 @@ static bool trans_VDWDUP(DisasContext *s, arg_viwdup *a)
     };
     return do_viwdup(s, a, fns[a->size]);
 }
+
+static bool do_vcmp(DisasContext *s, arg_vcmp *a, MVEGenCmpFn *fn)
+{
+    TCGv_ptr qn, qm;
+
+    if (!dc_isar_feature(aa32_mve, s) || !mve_check_qreg_bank(s, a->qm) ||
+        !fn) {
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qn = mve_qreg_ptr(a->qn);
+    qm = mve_qreg_ptr(a->qm);
+    fn(cpu_env, qn, qm);
+    tcg_temp_free_ptr(qn);
+    tcg_temp_free_ptr(qm);
+    if (a->mask) {
+        /* VPT */
+        gen_vpst(s, a->mask);
+    }
+    mve_update_eci(s);
+    return true;
+}
+
+#define DO_VCMP(INSN, FN)                                       \
+    static bool trans_##INSN(DisasContext *s, arg_vcmp *a)      \
+    {                                                           \
+        static MVEGenCmpFn * const fns[] = {                    \
+            gen_helper_mve_##FN##b,                             \
+            gen_helper_mve_##FN##h,                             \
+            gen_helper_mve_##FN##w,                             \
+            NULL,                                               \
+        };                                                      \
+        return do_vcmp(s, a, fns[a->size]);                     \
+    }
+
+DO_VCMP(VCMPEQ, vcmpeq)
+DO_VCMP(VCMPNE, vcmpne)
+DO_VCMP(VCMPCS, vcmpcs)
+DO_VCMP(VCMPHI, vcmphi)
+DO_VCMP(VCMPGE, vcmpge)
+DO_VCMP(VCMPLT, vcmplt)
+DO_VCMP(VCMPGT, vcmpgt)
+DO_VCMP(VCMPLE, vcmple)
-- 
2.20.1

[PATCH for-6.2 15/34] target/arm: Implement MVE integer vector-vs-scalar comparisons

[Peter Maydell]

Implement the MVE integer vector comparison instructions that compare
each element against a scalar from a general purpose register.  These
are "VCMP (vector)" encodings T4, T5 and T6 and "VPT (vector)"
encodings T4, T5 and T6.

We have to move the decodetree pattern for VPST, because it
overlaps with VCMP T4 with size = 0b11.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 32 +++++++++++++++++++++++++++
 target/arm/mve.decode      | 18 +++++++++++++---
 target/arm/mve_helper.c    | 44 +++++++++++++++++++++++++++++++-------
 target/arm/translate-mve.c | 43 +++++++++++++++++++++++++++++++++++++
 4 files changed, 126 insertions(+), 11 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index e89238eac9d..035779b0576 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -516,3 +516,35 @@ DEF_HELPER_FLAGS_3(mve_vcmpgtw, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vcmpleb, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vcmpleh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vcmplew, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vcmpeq_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpeq_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpeq_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmpne_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpne_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpne_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmpcs_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpcs_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpcs_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmphi_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmphi_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmphi_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmpge_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpge_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpge_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmplt_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmplt_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmplt_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmpgt_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpgt_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmpgt_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vcmple_scalarb, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmple_scalarh, TCG_CALL_NO_WG, void, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vcmple_scalarw, TCG_CALL_NO_WG, void, env, ptr, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 76bbf9a6136..ef708ba80ff 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -38,6 +38,7 @@
 &vidup qd rn size imm
 &viwdup qd rn rm size imm
 &vcmp qm qn size mask
+&vcmp_scalar qn rm size mask
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
@@ -90,6 +91,8 @@
 # Vector comparison; 4-bit Qm but 3-bit Qn
 %mask_22_13      22:1 13:3
 @vcmp    .... .... .. size:2 qn:3 . .... .... .... .... &vcmp qm=%qm mask=%mask_22_13
+@vcmp_scalar .... .... .. size:2 qn:3 . .... .... .... rm:4 &vcmp_scalar \
+             mask=%mask_22_13
 
 # Vector loads and stores
 
@@ -349,9 +352,6 @@ VQRDMULH_scalar  1111 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
                  rdahi=%rdahi rdalo=%rdalo
 }
 
-# Predicate operations
-VPST             1111 1110 0 . 11 000 1 ... 0 1111 0100 1101 mask=%mask_22_13
-
 # Logical immediate operations (1 reg and modified-immediate)
 
 # The cmode/op bits here decode VORR/VBIC/VMOV/VMVN, but
@@ -474,3 +474,15 @@ VCMPGE            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 0 @vcmp
 VCMPLT            1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 0 @vcmp
 VCMPGT            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 1 @vcmp
 VCMPLE            1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 1 @vcmp
+
+{
+  VPST            1111 1110 0 . 11 000 1 ... 0 1111 0100 1101 mask=%mask_22_13
+  VCMPEQ_scalar   1111 1110 0 . .. ... 1 ... 0 1111 0 1 0 0 .... @vcmp_scalar
+}
+VCMPNE_scalar     1111 1110 0 . .. ... 1 ... 0 1111 1 1 0 0 .... @vcmp_scalar
+VCMPCS_scalar     1111 1110 0 . .. ... 1 ... 0 1111 0 1 1 0 .... @vcmp_scalar
+VCMPHI_scalar     1111 1110 0 . .. ... 1 ... 0 1111 1 1 1 0 .... @vcmp_scalar
+VCMPGE_scalar     1111 1110 0 . .. ... 1 ... 1 1111 0 1 0 0 .... @vcmp_scalar
+VCMPLT_scalar     1111 1110 0 . .. ... 1 ... 1 1111 1 1 0 0 .... @vcmp_scalar
+VCMPGT_scalar     1111 1110 0 . .. ... 1 ... 1 1111 0 1 1 0 .... @vcmp_scalar
+VCMPLE_scalar     1111 1110 0 . .. ... 1 ... 1 1111 1 1 1 0 .... @vcmp_scalar
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 23398e86f7d..57a92bc6841 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1791,15 +1791,43 @@ DO_VIWDUP_ALL(vdwdup, do_sub_wrap)
         mve_advance_vpt(env);                                           \
     }
 
-#define DO_VCMP_S(OP, FN)                       \
-    DO_VCMP(OP##b, 1, int8_t, FN)               \
-    DO_VCMP(OP##h, 2, int16_t, FN)              \
-    DO_VCMP(OP##w, 4, int32_t, FN)
+#define DO_VCMP_SCALAR(OP, ESIZE, TYPE, FN)                             \
+    void HELPER(glue(mve_, OP))(CPUARMState *env, void *vn,             \
+                                uint32_t rm)                            \
+    {                                                                   \
+        TYPE *n = vn;                                                   \
+        uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
+        uint16_t beatpred = 0;                                          \
+        uint16_t emask = MAKE_64BIT_MASK(0, ESIZE);                     \
+        unsigned e;                                                     \
+        for (e = 0; e < 16 / ESIZE; e++) {                              \
+            bool r = FN(n[H##ESIZE(e)], (TYPE)rm);                      \
+            /* Comparison sets 0/1 bits for each byte in the element */ \
+            beatpred |= r * emask;                                      \
+            emask <<= ESIZE;                                            \
+        }                                                               \
+        beatpred &= mask;                                               \
+        env->v7m.vpr = (env->v7m.vpr & ~(uint32_t)eci_mask) |           \
+            (beatpred & eci_mask);                                      \
+        mve_advance_vpt(env);                                           \
+    }
 
-#define DO_VCMP_U(OP, FN)                       \
-    DO_VCMP(OP##b, 1, uint8_t, FN)              \
-    DO_VCMP(OP##h, 2, uint16_t, FN)             \
-    DO_VCMP(OP##w, 4, uint32_t, FN)
+#define DO_VCMP_S(OP, FN)                               \
+    DO_VCMP(OP##b, 1, int8_t, FN)                       \
+    DO_VCMP(OP##h, 2, int16_t, FN)                      \
+    DO_VCMP(OP##w, 4, int32_t, FN)                      \
+    DO_VCMP_SCALAR(OP##_scalarb, 1, int8_t, FN)         \
+    DO_VCMP_SCALAR(OP##_scalarh, 2, int16_t, FN)        \
+    DO_VCMP_SCALAR(OP##_scalarw, 4, int32_t, FN)
+
+#define DO_VCMP_U(OP, FN)                               \
+    DO_VCMP(OP##b, 1, uint8_t, FN)                      \
+    DO_VCMP(OP##h, 2, uint16_t, FN)                     \
+    DO_VCMP(OP##w, 4, uint32_t, FN)                     \
+    DO_VCMP_SCALAR(OP##_scalarb, 1, uint8_t, FN)        \
+    DO_VCMP_SCALAR(OP##_scalarh, 2, uint16_t, FN)       \
+    DO_VCMP_SCALAR(OP##_scalarw, 4, uint32_t, FN)
 
 #define DO_EQ(N, M) ((N) == (M))
 #define DO_NE(N, M) ((N) != (M))
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index a7334609e29..f8b8639eab7 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -44,6 +44,7 @@ typedef void MVEGenOneOpImmFn(TCGv_ptr, TCGv_ptr, TCGv_i64);
 typedef void MVEGenVIDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32);
 typedef void MVEGenVIWDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32, TCGv_i32);
 typedef void MVEGenCmpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
+typedef void MVEGenScalarCmpFn(TCGv_ptr, TCGv_ptr, TCGv_i32);
 
 /* Return the offset of a Qn register (same semantics as aa32_vfp_qreg()) */
 static inline long mve_qreg_offset(unsigned reg)
@@ -1207,6 +1208,37 @@ static bool do_vcmp(DisasContext *s, arg_vcmp *a, MVEGenCmpFn *fn)
     return true;
 }
 
+static bool do_vcmp_scalar(DisasContext *s, arg_vcmp_scalar *a,
+                           MVEGenScalarCmpFn *fn)
+{
+    TCGv_ptr qn;
+    TCGv_i32 rm;
+
+    if (!dc_isar_feature(aa32_mve, s) || !fn || a->rm == 13) {
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qn = mve_qreg_ptr(a->qn);
+    if (a->rm == 15) {
+        /* Encoding Rm=0b1111 means "constant zero" */
+        rm = tcg_constant_i32(0);
+    } else {
+        rm = load_reg(s, a->rm);
+    }
+    fn(cpu_env, qn, rm);
+    tcg_temp_free_ptr(qn);
+    tcg_temp_free_i32(rm);
+    if (a->mask) {
+        /* VPT */
+        gen_vpst(s, a->mask);
+    }
+    mve_update_eci(s);
+    return true;
+}
+
 #define DO_VCMP(INSN, FN)                                       \
     static bool trans_##INSN(DisasContext *s, arg_vcmp *a)      \
     {                                                           \
@@ -1217,6 +1249,17 @@ static bool do_vcmp(DisasContext *s, arg_vcmp *a, MVEGenCmpFn *fn)
             NULL,                                               \
         };                                                      \
         return do_vcmp(s, a, fns[a->size]);                     \
+    }                                                           \
+    static bool trans_##INSN##_scalar(DisasContext *s,          \
+                                      arg_vcmp_scalar *a)       \
+    {                                                           \
+        static MVEGenScalarCmpFn * const fns[] = {              \
+            gen_helper_mve_##FN##_scalarb,                      \
+            gen_helper_mve_##FN##_scalarh,                      \
+            gen_helper_mve_##FN##_scalarw,                      \
+            NULL,                                               \
+        };                                                      \
+        return do_vcmp_scalar(s, a, fns[a->size]);              \
     }
 
 DO_VCMP(VCMPEQ, vcmpeq)
-- 
2.20.1

[PATCH for-6.2 16/34] target/arm: Implement MVE VPSEL

[Peter Maydell]

Implement the MVE VPSEL insn, which sets each byte of the destination
vector Qd to the byte from either Qn or Qm depending on the value of
the corresponding bit in VPR.P0.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  2 ++
 target/arm/mve.decode      |  7 +++++--
 target/arm/mve_helper.c    | 19 +++++++++++++++++++
 target/arm/translate-mve.c |  2 ++
 4 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 035779b0576..f1a54aba5d4 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -86,6 +86,8 @@ DEF_HELPER_FLAGS_4(mve_vorr, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vorn, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_veor, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 
+DEF_HELPER_FLAGS_4(mve_vpsel, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
+
 DEF_HELPER_FLAGS_4(mve_vaddb, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vaddh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vaddw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index ef708ba80ff..4bd20a9a319 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -468,8 +468,11 @@ VSHLC             111 0 1110 1 . 1 imm:5 ... 0 1111 1100 rdm:4 qd=%qd
 # effectively "VCMP then VPST". A plain "VCMP" has a mask field of zero.
 VCMPEQ            1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 0 @vcmp
 VCMPNE            1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 0 @vcmp
-VCMPCS            1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 1 @vcmp
-VCMPHI            1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 1 @vcmp
+{
+  VPSEL           1111 1110 0 . 11 ... 1 ... 0 1111 . 0 . 0 ... 1 @2op_nosz
+  VCMPCS          1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 1 @vcmp
+  VCMPHI          1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 1 @vcmp
+}
 VCMPGE            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 0 @vcmp
 VCMPLT            1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 0 @vcmp
 VCMPGT            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 1 @vcmp
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 57a92bc6841..be67e7cea26 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1846,3 +1846,22 @@ DO_VCMP_S(vcmpge, DO_GE)
 DO_VCMP_S(vcmplt, DO_LT)
 DO_VCMP_S(vcmpgt, DO_GT)
 DO_VCMP_S(vcmple, DO_LE)
+
+void HELPER(mve_vpsel)(CPUARMState *env, void *vd, void *vn, void *vm)
+{
+    /*
+     * Qd[n] = VPR.P0[n] ? Qn[n] : Qm[n]
+     * but note that whether bytes are written to Qd is still subject
+     * to (all forms of) predication in the usual way.
+     */
+    uint64_t *d = vd, *n = vn, *m = vm;
+    uint16_t mask = mve_element_mask(env);
+    uint16_t p0 = FIELD_EX32(env->v7m.vpr, V7M_VPR, P0);
+    unsigned e;
+    for (e = 0; e < 16 / 8; e++, mask >>= 8, p0 >>= 8) {
+        uint64_t r = m[H8(e)];
+        mergemask(&r, n[H8(e)], p0);
+        mergemask(&d[H8(e)], r, mask);
+    }
+    mve_advance_vpt(env);
+}
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index f8b8639eab7..689e15c069b 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -376,6 +376,8 @@ DO_LOGIC(VORR, gen_helper_mve_vorr)
 DO_LOGIC(VORN, gen_helper_mve_vorn)
 DO_LOGIC(VEOR, gen_helper_mve_veor)
 
+DO_LOGIC(VPSEL, gen_helper_mve_vpsel)
+
 #define DO_2OP(INSN, FN) \
     static bool trans_##INSN(DisasContext *s, arg_2op *a)       \
     {                                                           \
-- 
2.20.1

[PATCH for-6.2 17/34] target/arm: Implement MVE VMLAS

[Peter Maydell]

Implement the MVE VMLAS insn, which multiplies a vector by a vector
and adds a scalar.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  8 ++++++++
 target/arm/mve.decode      |  3 +++
 target/arm/mve_helper.c    | 31 +++++++++++++++++++++++++++++++
 target/arm/translate-mve.c |  2 ++
 4 files changed, 44 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index f1a54aba5d4..6f2cc5c2929 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -351,6 +351,14 @@ DEF_HELPER_FLAGS_4(mve_vqdmullb_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i3
 DEF_HELPER_FLAGS_4(mve_vqdmullt_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vqdmullt_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vmlassb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlassh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlassw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vmlasub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlasuh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlasuw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_4(mve_vmlaldavsh, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 DEF_HELPER_FLAGS_4(mve_vmlaldavsw, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 DEF_HELPER_FLAGS_4(mve_vmlaldavxsh, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 4bd20a9a319..05c30735545 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -345,6 +345,9 @@ VBRSR            1111 1110 0 . .. ... 1 ... 1 1110 . 110 .... @2scalar
 VQDMULH_scalar   1110 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 VQRDMULH_scalar  1111 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 
+VMLAS_S          1110 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
+VMLAS_U          1111 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
+
 # Vector add across vector
 {
   VADDV          111 u:1 1110 1111 size:2 01 ... 0 1111 0 0 a:1 0 qm:3 0 rda=%rdalo
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index be67e7cea26..98c3a418dcb 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -955,6 +955,22 @@ DO_VQDMLADH_OP(vqrdmlsdhxw, 4, int32_t, 1, 1, do_vqdmlsdh_w)
         mve_advance_vpt(env);                                           \
     }
 
+/* "accumulating" version where FN takes d as well as n and m */
+#define DO_2OP_ACC_SCALAR(OP, ESIZE, TYPE, FN)                          \
+    void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, void *vn,   \
+                                uint32_t rm)                            \
+    {                                                                   \
+        TYPE *d = vd, *n = vn;                                          \
+        TYPE m = rm;                                                    \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+            mergemask(&d[H##ESIZE(e)],                                  \
+                      FN(d[H##ESIZE(e)], n[H##ESIZE(e)], m), mask);     \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
 /* provide unsigned 2-op scalar helpers for all sizes */
 #define DO_2OP_SCALAR_U(OP, FN)                 \
     DO_2OP_SCALAR(OP##b, 1, uint8_t, FN)        \
@@ -965,6 +981,15 @@ DO_VQDMLADH_OP(vqrdmlsdhxw, 4, int32_t, 1, 1, do_vqdmlsdh_w)
     DO_2OP_SCALAR(OP##h, 2, int16_t, FN)        \
     DO_2OP_SCALAR(OP##w, 4, int32_t, FN)
 
+#define DO_2OP_ACC_SCALAR_U(OP, FN)             \
+    DO_2OP_ACC_SCALAR(OP##b, 1, uint8_t, FN)    \
+    DO_2OP_ACC_SCALAR(OP##h, 2, uint16_t, FN)   \
+    DO_2OP_ACC_SCALAR(OP##w, 4, uint32_t, FN)
+#define DO_2OP_ACC_SCALAR_S(OP, FN)             \
+    DO_2OP_ACC_SCALAR(OP##b, 1, int8_t, FN)     \
+    DO_2OP_ACC_SCALAR(OP##h, 2, int16_t, FN)    \
+    DO_2OP_ACC_SCALAR(OP##w, 4, int32_t, FN)
+
 DO_2OP_SCALAR_U(vadd_scalar, DO_ADD)
 DO_2OP_SCALAR_U(vsub_scalar, DO_SUB)
 DO_2OP_SCALAR_U(vmul_scalar, DO_MUL)
@@ -994,6 +1019,12 @@ DO_2OP_SAT_SCALAR(vqrdmulh_scalarb, 1, int8_t, DO_QRDMULH_B)
 DO_2OP_SAT_SCALAR(vqrdmulh_scalarh, 2, int16_t, DO_QRDMULH_H)
 DO_2OP_SAT_SCALAR(vqrdmulh_scalarw, 4, int32_t, DO_QRDMULH_W)
 
+/* Vector by vector plus scalar */
+#define DO_VMLAS(D, N, M) ((N) * (D) + (M))
+
+DO_2OP_ACC_SCALAR_S(vmlass, DO_VMLAS)
+DO_2OP_ACC_SCALAR_U(vmlasu, DO_VMLAS)
+
 /*
  * Long saturating scalar ops. As with DO_2OP_L, TYPE and H are for the
  * input (smaller) type and LESIZE, LTYPE, LH for the output (long) type.
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 689e15c069b..011d1d6bcd9 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -596,6 +596,8 @@ DO_2OP_SCALAR(VQSUB_U_scalar, vqsubu_scalar)
 DO_2OP_SCALAR(VQDMULH_scalar, vqdmulh_scalar)
 DO_2OP_SCALAR(VQRDMULH_scalar, vqrdmulh_scalar)
 DO_2OP_SCALAR(VBRSR, vbrsr)
+DO_2OP_SCALAR(VMLAS_S, vmlass)
+DO_2OP_SCALAR(VMLAS_U, vmlasu)
 
 static bool trans_VQDMULLB_scalar(DisasContext *s, arg_2scalar *a)
 {
-- 
2.20.1

[PATCH for-6.2 18/34] target/arm: Implement MVE shift-by-scalar

[Peter Maydell]

Implement the MVE instructions which perform shifts by a scalar.
These are VSHL T2, VRSHL T2, VQSHL T1 and VQRSHL T2.  They take the
shift amount in a general purpose register and shift every element in
the vector by that amount.

Mostly we can reuse the helper functions for shift-by-immediate; we
do need two new helpers for VQRSHL.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  8 +++++++
 target/arm/mve.decode      | 23 ++++++++++++++++---
 target/arm/mve_helper.c    |  2 ++
 target/arm/translate-mve.c | 46 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 76 insertions(+), 3 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 6f2cc5c2929..c702db4c39a 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -422,6 +422,14 @@ DEF_HELPER_FLAGS_4(mve_vrshli_ub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vrshli_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vrshli_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vqrshli_sb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrshli_sh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrshli_sw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vqrshli_ub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrshli_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrshli_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_4(mve_vshllbsb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vshllbsh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vshllbub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 05c30735545..1a788e438de 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -39,6 +39,7 @@
 &viwdup qd rn rm size imm
 &vcmp qm qn size mask
 &vcmp_scalar qn rm size mask
+&shl_scalar qda rm size
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
@@ -88,6 +89,8 @@
 @2_shr_w .... .... .. 1 ..... .... .... .... .... &2shift qd=%qd qm=%qm \
          size=2 shift=%rshift_i5
 
+@shl_scalar .... .... .... size:2 .. .... .... .... rm:4 &shl_scalar qda=%qd
+
 # Vector comparison; 4-bit Qm but 3-bit Qn
 %mask_22_13      22:1 13:3
 @vcmp    .... .... .. size:2 qn:3 . .... .... .... .... &vcmp qm=%qm mask=%mask_22_13
@@ -320,7 +323,23 @@ VRMLSLDAVH       1111 1110 1 ... ... 0 ... x:1 1110 . 0 a:1 0 ... 1 @vmlaldav_no
 
 VADD_scalar      1110 1110 0 . .. ... 1 ... 0 1111 . 100 .... @2scalar
 VSUB_scalar      1110 1110 0 . .. ... 1 ... 1 1111 . 100 .... @2scalar
-VMUL_scalar      1110 1110 0 . .. ... 1 ... 1 1110 . 110 .... @2scalar
+
+{
+  VSHL_S_scalar   1110 1110 0 . 11 .. 01 ... 1 1110 0110 .... @shl_scalar
+  VRSHL_S_scalar  1110 1110 0 . 11 .. 11 ... 1 1110 0110 .... @shl_scalar
+  VQSHL_S_scalar  1110 1110 0 . 11 .. 01 ... 1 1110 1110 .... @shl_scalar
+  VQRSHL_S_scalar 1110 1110 0 . 11 .. 11 ... 1 1110 1110 .... @shl_scalar
+  VMUL_scalar     1110 1110 0 . .. ... 1 ... 1 1110 . 110 .... @2scalar
+}
+
+{
+  VSHL_U_scalar   1111 1110 0 . 11 .. 01 ... 1 1110 0110 .... @shl_scalar
+  VRSHL_U_scalar  1111 1110 0 . 11 .. 11 ... 1 1110 0110 .... @shl_scalar
+  VQSHL_U_scalar  1111 1110 0 . 11 .. 01 ... 1 1110 1110 .... @shl_scalar
+  VQRSHL_U_scalar 1111 1110 0 . 11 .. 11 ... 1 1110 1110 .... @shl_scalar
+  VBRSR           1111 1110 0 . .. ... 1 ... 1 1110 . 110 .... @2scalar
+}
+
 VHADD_S_scalar   1110 1110 0 . .. ... 0 ... 0 1111 . 100 .... @2scalar
 VHADD_U_scalar   1111 1110 0 . .. ... 0 ... 0 1111 . 100 .... @2scalar
 VHSUB_S_scalar   1110 1110 0 . .. ... 0 ... 1 1111 . 100 .... @2scalar
@@ -340,8 +359,6 @@ VHSUB_U_scalar   1111 1110 0 . .. ... 0 ... 1 1111 . 100 .... @2scalar
                   size=%size_28
 }
 
-VBRSR            1111 1110 0 . .. ... 1 ... 1 1110 . 110 .... @2scalar
-
 VQDMULH_scalar   1110 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 VQRDMULH_scalar  1111 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 98c3a418dcb..d44cd80e18b 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1346,6 +1346,8 @@ DO_2SHIFT_SAT_S(vqshli_s, DO_SQSHL_OP)
 DO_2SHIFT_SAT_S(vqshlui_s, DO_SUQSHL_OP)
 DO_2SHIFT_U(vrshli_u, DO_VRSHLU)
 DO_2SHIFT_S(vrshli_s, DO_VRSHLS)
+DO_2SHIFT_SAT_U(vqrshli_u, DO_UQRSHL_OP)
+DO_2SHIFT_SAT_S(vqrshli_s, DO_SQRSHL_OP)
 
 /* Shift-and-insert; we always work with 64 bits at a time */
 #define DO_2SHIFT_INSERT(OP, ESIZE, SHIFTFN, MASKFN)                    \
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 011d1d6bcd9..650d1470f08 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -1004,6 +1004,52 @@ DO_2SHIFT(VRSHRI_U, vrshli_u, true)
 DO_2SHIFT(VSRI, vsri, false)
 DO_2SHIFT(VSLI, vsli, false)
 
+static bool do_2shift_scalar(DisasContext *s, arg_shl_scalar *a,
+                             MVEGenTwoOpShiftFn *fn)
+{
+    TCGv_ptr qda;
+    TCGv_i32 rm;
+
+    if (!dc_isar_feature(aa32_mve, s) ||
+        !mve_check_qreg_bank(s, a->qda) ||
+        a->rm == 13 || a->rm == 15 || !fn) {
+        /* Rm cases are UNPREDICTABLE */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qda = mve_qreg_ptr(a->qda);
+    rm = load_reg(s, a->rm);
+    fn(cpu_env, qda, qda, rm);
+    tcg_temp_free_ptr(qda);
+    tcg_temp_free_i32(rm);
+    mve_update_eci(s);
+    return true;
+}
+
+#define DO_2SHIFT_SCALAR(INSN, FN)                                      \
+    static bool trans_##INSN(DisasContext *s, arg_shl_scalar *a)        \
+    {                                                                   \
+        static MVEGenTwoOpShiftFn * const fns[] = {                     \
+            gen_helper_mve_##FN##b,                                     \
+            gen_helper_mve_##FN##h,                                     \
+            gen_helper_mve_##FN##w,                                     \
+            NULL,                                                       \
+        };                                                              \
+        return do_2shift_scalar(s, a, fns[a->size]);                    \
+    }
+
+DO_2SHIFT_SCALAR(VSHL_S_scalar, vshli_s)
+DO_2SHIFT_SCALAR(VSHL_U_scalar, vshli_u)
+DO_2SHIFT_SCALAR(VRSHL_S_scalar, vrshli_s)
+DO_2SHIFT_SCALAR(VRSHL_U_scalar, vrshli_u)
+DO_2SHIFT_SCALAR(VQSHL_S_scalar, vqshli_s)
+DO_2SHIFT_SCALAR(VQSHL_U_scalar, vqshli_u)
+DO_2SHIFT_SCALAR(VQRSHL_S_scalar, vqrshli_s)
+DO_2SHIFT_SCALAR(VQRSHL_U_scalar, vqrshli_u)
+
 #define DO_VSHLL(INSN, FN)                                      \
     static bool trans_##INSN(DisasContext *s, arg_2shift *a)    \
     {                                                           \
-- 
2.20.1

[PATCH for-6.2 19/34] target/arm: Move 'x' and 'a' bit definitions into vmlaldav formats

[Peter Maydell]

All the users of the vmlaldav formats have an 'x bit in bit 12 and an
'a' bit in bit 5; move these to the format rather than specifying them
in each insn pattern.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
Not sure why I didn't write it this way in the first place;
when I came to implement VMLADAV I noticed the oddity and
preferred to fix it rather than either copying it for VMLADAV
or having VMLADAV different.
---
 target/arm/mve.decode | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 1a788e438de..67bd894daf1 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -305,19 +305,19 @@ VDUP             1110 1110 1 0 10 ... 0 .... 1011 . 0 0 1 0000 @vdup size=2
 
 &vmlaldav rdahi rdalo size qn qm x a
 
-@vmlaldav        .... .... . ... ... . ... . .... .... qm:3 . \
+@vmlaldav        .... .... . ... ... . ... x:1 .... .. a:1 . qm:3 . \
                  qn=%qn rdahi=%rdahi rdalo=%rdalo size=%size_16 &vmlaldav
-@vmlaldav_nosz   .... .... . ... ... . ... . .... .... qm:3 . \
+@vmlaldav_nosz   .... .... . ... ... . ... x:1 .... .. a:1 . qm:3 . \
                  qn=%qn rdahi=%rdahi rdalo=%rdalo size=0 &vmlaldav
-VMLALDAV_S       1110 1110 1 ... ... . ... x:1 1110 . 0 a:1 0 ... 0 @vmlaldav
-VMLALDAV_U       1111 1110 1 ... ... . ... x:1 1110 . 0 a:1 0 ... 0 @vmlaldav
+VMLALDAV_S       1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
+VMLALDAV_U       1111 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
 
-VMLSLDAV         1110 1110 1 ... ... . ... x:1 1110 . 0 a:1 0 ... 1 @vmlaldav
+VMLSLDAV         1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 1 @vmlaldav
 
-VRMLALDAVH_S     1110 1110 1 ... ... 0 ... x:1 1111 . 0 a:1 0 ... 0 @vmlaldav_nosz
-VRMLALDAVH_U     1111 1110 1 ... ... 0 ... x:1 1111 . 0 a:1 0 ... 0 @vmlaldav_nosz
+VRMLALDAVH_S     1110 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
+VRMLALDAVH_U     1111 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
 
-VRMLSLDAVH       1111 1110 1 ... ... 0 ... x:1 1110 . 0 a:1 0 ... 1 @vmlaldav_nosz
+VRMLSLDAVH       1111 1110 1 ... ... 0 ... . 1110 . 0 . 0 ... 1 @vmlaldav_nosz
 
 # Scalar operations
 
-- 
2.20.1

[PATCH for-6.2 20/34] target/arm: Implement MVE integer min/max across vector

[Peter Maydell]

Implement the MVE integer min/max across vector insns
VMAXV, VMINV, VMAXAV and VMINAV, which find the maximum
from the vector elements and a general purpose register,
and store the maximum back into the general purpose
register.

These insns overlap with VRMLALDAVH (they use what would
be RdaHi=0b110).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 20 +++++++++++
 target/arm/mve.decode      | 18 ++++++++--
 target/arm/mve_helper.c    | 69 ++++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c | 48 ++++++++++++++++++++++++++
 4 files changed, 153 insertions(+), 2 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index c702db4c39a..282bfe80942 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -387,6 +387,26 @@ DEF_HELPER_FLAGS_3(mve_vaddvuh, TCG_CALL_NO_WG, i32, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vaddvsw, TCG_CALL_NO_WG, i32, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vaddvuw, TCG_CALL_NO_WG, i32, env, ptr, i32)
 
+DEF_HELPER_FLAGS_3(mve_vmaxvsb, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxvsh, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxvsw, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxvub, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxvuh, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxvuw, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxavb, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxavh, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vmaxavw, TCG_CALL_NO_WG, i32, env, ptr, i32)
+
+DEF_HELPER_FLAGS_3(mve_vminvsb, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminvsh, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminvsw, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminvub, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminvuh, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminvuw, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminavb, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminavh, TCG_CALL_NO_WG, i32, env, ptr, i32)
+DEF_HELPER_FLAGS_3(mve_vminavw, TCG_CALL_NO_WG, i32, env, ptr, i32)
+
 DEF_HELPER_FLAGS_3(mve_vaddlv_s, TCG_CALL_NO_WG, i64, env, ptr, i64)
 DEF_HELPER_FLAGS_3(mve_vaddlv_u, TCG_CALL_NO_WG, i64, env, ptr, i64)
 
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 67bd894daf1..9ae417b718a 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -40,6 +40,7 @@
 &vcmp qm qn size mask
 &vcmp_scalar qn rm size mask
 &shl_scalar qda rm size
+&vmaxv qm rda size
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
@@ -97,6 +98,8 @@
 @vcmp_scalar .... .... .. size:2 qn:3 . .... .... .... rm:4 &vcmp_scalar \
              mask=%mask_22_13
 
+@vmaxv .... .... .... size:2 .. rda:4 .... .... .... &vmaxv qm=%qm
+
 # Vector loads and stores
 
 # Widening loads and narrowing stores:
@@ -314,8 +317,19 @@ VMLALDAV_U       1111 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
 
 VMLSLDAV         1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 1 @vmlaldav
 
-VRMLALDAVH_S     1110 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
-VRMLALDAVH_U     1111 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
+{
+  VMAXV_S        1110 1110 1110  .. 10 ....  1111 0 0 . 0 ... 0 @vmaxv
+  VMINV_S        1110 1110 1110  .. 10 ....  1111 1 0 . 0 ... 0 @vmaxv
+  VMAXAV         1110 1110 1110  .. 00 ....  1111 0 0 . 0 ... 0 @vmaxv
+  VMINAV         1110 1110 1110  .. 00 ....  1111 1 0 . 0 ... 0 @vmaxv
+  VRMLALDAVH_S   1110 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
+}
+
+{
+  VMAXV_U        1111 1110 1110  .. 10 ....  1111 0 0 . 0 ... 0 @vmaxv
+  VMINV_U        1111 1110 1110  .. 10 ....  1111 1 0 . 0 ... 0 @vmaxv
+  VRMLALDAVH_U   1111 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
+}
 
 VRMLSLDAVH       1111 1110 1 ... ... 0 ... . 1110 . 0 . 0 ... 1 @vmlaldav_nosz
 
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index d44cd80e18b..5066ee3169a 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1266,6 +1266,75 @@ DO_VADDV(vaddvub, 1, uint8_t)
 DO_VADDV(vaddvuh, 2, uint16_t)
 DO_VADDV(vaddvuw, 4, uint32_t)
 
+/*
+ * Vector max/min across vector. Unlike VADDV, we must
+ * read ra as the element size, not its full width.
+ * We work with int64_t internally for simplicity.
+ */
+#define DO_VMAXMINV(OP, ESIZE, TYPE, RATYPE, FN)                \
+    uint32_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vm, \
+                                    uint32_t ra_in)             \
+    {                                                           \
+        uint16_t mask = mve_element_mask(env);                  \
+        unsigned e;                                             \
+        TYPE *m = vm;                                           \
+        int64_t ra = (RATYPE)ra_in;                             \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
+            if (mask & 1) {                                     \
+                ra = FN(ra, m[H##ESIZE(e)]);                    \
+            }                                                   \
+        }                                                       \
+        mve_advance_vpt(env);                                   \
+        return ra;                                              \
+    }                                                           \
+
+#define DO_VMAXMINV_U(INSN, FN)                         \
+    DO_VMAXMINV(INSN##b, 1, uint8_t, uint8_t, FN)       \
+    DO_VMAXMINV(INSN##h, 2, uint16_t, uint16_t, FN)     \
+    DO_VMAXMINV(INSN##w, 4, uint32_t, uint32_t, FN)
+#define DO_VMAXMINV_S(INSN, FN)                         \
+    DO_VMAXMINV(INSN##b, 1, int8_t, int8_t, FN)         \
+    DO_VMAXMINV(INSN##h, 2, int16_t, int16_t, FN)       \
+    DO_VMAXMINV(INSN##w, 4, int32_t, int32_t, FN)
+
+/* Max and min of absolute values */
+static int64_t do_maxa(int64_t n, int64_t m)
+{
+    if (n < 0) {
+        n = -n;
+    }
+    if (m < 0) {
+        m = -m;
+    }
+    return MAX(n, m);
+}
+
+static int64_t do_mina(int64_t n, int64_t m)
+{
+    if (n < 0) {
+        n = -n;
+    }
+    if (m < 0) {
+        m = -m;
+    }
+    return MIN(n, m);
+}
+
+DO_VMAXMINV_S(vmaxvs, DO_MAX)
+DO_VMAXMINV_U(vmaxvu, DO_MAX)
+DO_VMAXMINV_S(vminvs, DO_MIN)
+DO_VMAXMINV_U(vminvu, DO_MIN)
+/*
+ * VMAXAV, VMINAV treat the general purpose input as unsigned
+ * and the vector elements as signed.
+ */
+DO_VMAXMINV(vmaxavb, 1, int8_t, uint8_t, do_maxa)
+DO_VMAXMINV(vmaxavh, 2, int16_t, uint16_t, do_maxa)
+DO_VMAXMINV(vmaxavw, 4, int32_t, uint32_t, do_maxa)
+DO_VMAXMINV(vminavb, 1, int8_t, uint8_t, do_mina)
+DO_VMAXMINV(vminavh, 2, int16_t, uint16_t, do_mina)
+DO_VMAXMINV(vminavw, 4, int32_t, uint32_t, do_mina)
+
 #define DO_VADDLV(OP, TYPE, LTYPE)                              \
     uint64_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vm, \
                                     uint64_t ra)                \
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 650d1470f08..949c11344e3 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -1320,3 +1320,51 @@ DO_VCMP(VCMPGE, vcmpge)
 DO_VCMP(VCMPLT, vcmplt)
 DO_VCMP(VCMPGT, vcmpgt)
 DO_VCMP(VCMPLE, vcmple)
+
+static bool do_vmaxv(DisasContext *s, arg_vmaxv *a, MVEGenVADDVFn fn)
+{
+    /*
+     * MIN/MAX operations across a vector: compute the min or
+     * max of the initial value in a general purpose register
+     * and all the elements in the vector, and store it back
+     * into the general purpose register.
+     */
+    TCGv_ptr qm;
+    TCGv_i32 rda;
+
+    if (!dc_isar_feature(aa32_mve, s) || !mve_check_qreg_bank(s, a->qm) ||
+        !fn || a->rda == 13 || a->rda == 15) {
+        /* Rda cases are UNPREDICTABLE */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qm = mve_qreg_ptr(a->qm);
+    rda = load_reg(s, a->rda);
+    fn(rda, cpu_env, qm, rda);
+    store_reg(s, a->rda, rda);
+    tcg_temp_free_ptr(qm);
+    mve_update_eci(s);
+    return true;
+}
+
+#define DO_VMAXV(INSN, FN)                                      \
+    static bool trans_##INSN(DisasContext *s, arg_vmaxv *a)     \
+    {                                                           \
+        static MVEGenVADDVFn * const fns[] = {                  \
+            gen_helper_mve_##FN##b,                             \
+            gen_helper_mve_##FN##h,                             \
+            gen_helper_mve_##FN##w,                             \
+            NULL,                                               \
+        };                                                      \
+        return do_vmaxv(s, a, fns[a->size]);                    \
+    }
+
+DO_VMAXV(VMAXV_S, vmaxvs)
+DO_VMAXV(VMAXV_U, vmaxvu)
+DO_VMAXV(VMAXAV, vmaxav)
+DO_VMAXV(VMINV_S, vminvs)
+DO_VMAXV(VMINV_U, vminvu)
+DO_VMAXV(VMINAV, vminav)
-- 
2.20.1

[PATCH for-6.2 21/34] target/arm: Implement MVE VABAV

[Peter Maydell]

Implement the MVE VABAV insn, which computes absolute differences
between elements of two vectors and accumulates the result into
a general purpose register.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  7 +++++++
 target/arm/mve.decode      |  6 ++++++
 target/arm/mve_helper.c    | 26 +++++++++++++++++++++++
 target/arm/translate-mve.c | 43 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 282bfe80942..5c3f8a26df0 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -410,6 +410,13 @@ DEF_HELPER_FLAGS_3(mve_vminavw, TCG_CALL_NO_WG, i32, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vaddlv_s, TCG_CALL_NO_WG, i64, env, ptr, i64)
 DEF_HELPER_FLAGS_3(mve_vaddlv_u, TCG_CALL_NO_WG, i64, env, ptr, i64)
 
+DEF_HELPER_FLAGS_4(mve_vabavsb, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vabavsh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vabavsw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vabavub, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vabavuh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vabavuw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_3(mve_vmovi, TCG_CALL_NO_WG, void, env, ptr, i64)
 DEF_HELPER_FLAGS_3(mve_vandi, TCG_CALL_NO_WG, void, env, ptr, i64)
 DEF_HELPER_FLAGS_3(mve_vorri, TCG_CALL_NO_WG, void, env, ptr, i64)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 9ae417b718a..bf6cf6f8383 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -41,6 +41,7 @@
 &vcmp_scalar qn rm size mask
 &shl_scalar qda rm size
 &vmaxv qm rda size
+&vabav qn qm rda size
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
@@ -386,6 +387,11 @@ VMLAS_U          1111 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
                  rdahi=%rdahi rdalo=%rdalo
 }
 
+@vabav           .... .... .. size:2 .... rda:4 .... .... .... &vabav qn=%qn qm=%qm
+
+VABAV_S          111 0 1110 10 .. ... 0 .... 1111 . 0 . 0 ... 1 @vabav
+VABAV_U          111 1 1110 10 .. ... 0 .... 1111 . 0 . 0 ... 1 @vabav
+
 # Logical immediate operations (1 reg and modified-immediate)
 
 # The cmode/op bits here decode VORR/VBIC/VMOV/VMVN, but
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 5066ee3169a..4eb5dbce6d7 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1335,6 +1335,32 @@ DO_VMAXMINV(vminavb, 1, int8_t, uint8_t, do_mina)
 DO_VMAXMINV(vminavh, 2, int16_t, uint16_t, do_mina)
 DO_VMAXMINV(vminavw, 4, int32_t, uint32_t, do_mina)
 
+#define DO_VABAV(OP, ESIZE, TYPE)                               \
+    uint32_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vn, \
+                                    void *vm, uint32_t ra)      \
+    {                                                           \
+        uint16_t mask = mve_element_mask(env);                  \
+        unsigned e;                                             \
+        TYPE *m = vm, *n = vn;                                  \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
+            if (mask & 1) {                                     \
+                int64_t n0 = n[H##ESIZE(e)];                    \
+                int64_t m0 = m[H##ESIZE(e)];                    \
+                uint32_t r = n0 >= m0 ? (n0 - m0) : (m0 - n0);  \
+                ra += r;                                        \
+            }                                                   \
+        }                                                       \
+        mve_advance_vpt(env);                                   \
+        return ra;                                              \
+    }
+
+DO_VABAV(vabavsb, 1, int8_t)
+DO_VABAV(vabavsh, 2, int16_t)
+DO_VABAV(vabavsw, 4, int32_t)
+DO_VABAV(vabavub, 1, uint8_t)
+DO_VABAV(vabavuh, 2, uint16_t)
+DO_VABAV(vabavuw, 4, uint32_t)
+
 #define DO_VADDLV(OP, TYPE, LTYPE)                              \
     uint64_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vm, \
                                     uint64_t ra)                \
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 949c11344e3..c304b8d6e41 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -45,6 +45,7 @@ typedef void MVEGenVIDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32);
 typedef void MVEGenVIWDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32, TCGv_i32);
 typedef void MVEGenCmpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenScalarCmpFn(TCGv_ptr, TCGv_ptr, TCGv_i32);
+typedef void MVEGenVABAVFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
 
 /* Return the offset of a Qn register (same semantics as aa32_vfp_qreg()) */
 static inline long mve_qreg_offset(unsigned reg)
@@ -1368,3 +1369,45 @@ DO_VMAXV(VMAXAV, vmaxav)
 DO_VMAXV(VMINV_S, vminvs)
 DO_VMAXV(VMINV_U, vminvu)
 DO_VMAXV(VMINAV, vminav)
+
+static bool do_vabav(DisasContext *s, arg_vabav *a, MVEGenVABAVFn *fn)
+{
+    /* Absolute difference accumulated across vector */
+    TCGv_ptr qn, qm;
+    TCGv_i32 rda;
+
+    if (!dc_isar_feature(aa32_mve, s) ||
+        !mve_check_qreg_bank(s, a->qm | a->qn) ||
+        !fn || a->rda == 13 || a->rda == 15) {
+        /* Rda cases are UNPREDICTABLE */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qm = mve_qreg_ptr(a->qm);
+    qn = mve_qreg_ptr(a->qn);
+    rda = load_reg(s, a->rda);
+    fn(rda, cpu_env, qn, qm, rda);
+    store_reg(s, a->rda, rda);
+    tcg_temp_free_ptr(qm);
+    tcg_temp_free_ptr(qn);
+    mve_update_eci(s);
+    return true;
+}
+
+#define DO_VABAV(INSN, FN)                                      \
+    static bool trans_##INSN(DisasContext *s, arg_vabav *a)     \
+    {                                                           \
+        static MVEGenVABAVFn * const fns[] = {                  \
+            gen_helper_mve_##FN##b,                             \
+            gen_helper_mve_##FN##h,                             \
+            gen_helper_mve_##FN##w,                             \
+            NULL,                                               \
+        };                                                      \
+        return do_vabav(s, a, fns[a->size]);                    \
+    }
+
+DO_VABAV(VABAV_S, vabavs)
+DO_VABAV(VABAV_U, vabavu)
-- 
2.20.1

[PATCH for-6.2 22/34] target/arm: Implement MVE narrowing moves

[Peter Maydell]

Implement the MVE narrowing move insns VMOVN, VQMOVN and VQMOVUN.
These take a double-width input, narrow it (possibly saturating) and
store the result to either the top or bottom half of the output
element.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 20 ++++++++++
 target/arm/mve.decode      | 12 ++++++
 target/arm/mve_helper.c    | 78 ++++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c | 22 +++++++++++
 4 files changed, 132 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 5c3f8a26df0..84aa9de6e06 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -80,6 +80,26 @@ DEF_HELPER_FLAGS_3(mve_vnegw, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vfnegh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vfnegs, TCG_CALL_NO_WG, void, env, ptr, ptr)
 
+DEF_HELPER_FLAGS_3(mve_vmovnbb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vmovnbh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vmovntb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vmovnth, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vqmovunbb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovunbh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovuntb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovunth, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vqmovnbsb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovnbsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovntsb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovntsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vqmovnbub, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovnbuh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovntub, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqmovntuh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
 DEF_HELPER_FLAGS_4(mve_vand, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vbic, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vorr, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index bf6cf6f8383..79c529e762f 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -153,6 +153,9 @@ VMUL             1110 1111 0 . .. ... 0 ... 0 1001 . 1 . 1 ... 0 @2op
   VSHLL_BS       111 0 1110 0 . 11 .. 01 ... 0 1110 0 0 . 0 ... 1 @2_shll_esize_b
   VSHLL_BS       111 0 1110 0 . 11 .. 01 ... 0 1110 0 0 . 0 ... 1 @2_shll_esize_h
 
+  VQMOVUNB       111 0 1110 0 . 11 .. 01 ... 0 1110 1 0 . 0 ... 1 @1op
+  VQMOVN_BS      111 0 1110 0 . 11 .. 11 ... 0 1110 0 0 . 0 ... 1 @1op
+
   VMULH_S        111 0 1110 0 . .. ...1 ... 0 1110 . 0 . 0 ... 1 @2op
 }
 
@@ -160,6 +163,9 @@ VMUL             1110 1111 0 . .. ... 0 ... 0 1001 . 1 . 1 ... 0 @2op
   VSHLL_BU       111 1 1110 0 . 11 .. 01 ... 0 1110 0 0 . 0 ... 1 @2_shll_esize_b
   VSHLL_BU       111 1 1110 0 . 11 .. 01 ... 0 1110 0 0 . 0 ... 1 @2_shll_esize_h
 
+  VMOVNB         111 1 1110 0 . 11 .. 01 ... 0 1110 1 0 . 0 ... 1 @1op
+  VQMOVN_BU      111 1 1110 0 . 11 .. 11 ... 0 1110 0 0 . 0 ... 1 @1op
+
   VMULH_U        111 1 1110 0 . .. ...1 ... 0 1110 . 0 . 0 ... 1 @2op
 }
 
@@ -167,6 +173,9 @@ VMUL             1110 1111 0 . .. ... 0 ... 0 1001 . 1 . 1 ... 0 @2op
   VSHLL_TS       111 0 1110 0 . 11 .. 01 ... 1 1110 0 0 . 0 ... 1 @2_shll_esize_b
   VSHLL_TS       111 0 1110 0 . 11 .. 01 ... 1 1110 0 0 . 0 ... 1 @2_shll_esize_h
 
+  VQMOVUNT       111 0 1110 0 . 11 .. 01 ... 1 1110 1 0 . 0 ... 1 @1op
+  VQMOVN_TS      111 0 1110 0 . 11 .. 11 ... 1 1110 0 0 . 0 ... 1 @1op
+
   VRMULH_S       111 0 1110 0 . .. ...1 ... 1 1110 . 0 . 0 ... 1 @2op
 }
 
@@ -174,6 +183,9 @@ VMUL             1110 1111 0 . .. ... 0 ... 0 1001 . 1 . 1 ... 0 @2op
   VSHLL_TU       111 1 1110 0 . 11 .. 01 ... 1 1110 0 0 . 0 ... 1 @2_shll_esize_b
   VSHLL_TU       111 1 1110 0 . 11 .. 01 ... 1 1110 0 0 . 0 ... 1 @2_shll_esize_h
 
+  VMOVNT         111 1 1110 0 . 11 .. 01 ... 1 1110 1 0 . 0 ... 1 @1op
+  VQMOVN_TU      111 1 1110 0 . 11 .. 11 ... 1 1110 0 0 . 0 ... 1 @1op
+
   VRMULH_U       111 1 1110 0 . .. ...1 ... 1 1110 . 0 . 0 ... 1 @2op
 }
 
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 4eb5dbce6d7..725fe64a348 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1668,6 +1668,84 @@ DO_VSHRN_SAT_UH(vqrshrnb_uh, vqrshrnt_uh, DO_RSHRN_UH)
 DO_VSHRN_SAT_SB(vqrshrunbb, vqrshruntb, DO_RSHRUN_B)
 DO_VSHRN_SAT_SH(vqrshrunbh, vqrshrunth, DO_RSHRUN_H)
 
+#define DO_VMOVN(OP, TOP, ESIZE, TYPE, LESIZE, LTYPE)                   \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm)         \
+    {                                                                   \
+        LTYPE *m = vm;                                                  \
+        TYPE *d = vd;                                                   \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned le;                                                    \
+        mask >>= ESIZE * TOP;                                           \
+        for (le = 0; le < 16 / LESIZE; le++, mask >>= LESIZE) {         \
+            mergemask(&d[H##ESIZE(le * 2 + TOP)],                       \
+                      m[H##LESIZE(le)], mask);                          \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+DO_VMOVN(vmovnbb, false, 1, uint8_t, 2, uint16_t)
+DO_VMOVN(vmovnbh, false, 2, uint16_t, 4, uint32_t)
+DO_VMOVN(vmovntb, true, 1, uint8_t, 2, uint16_t)
+DO_VMOVN(vmovnth, true, 2, uint16_t, 4, uint32_t)
+
+#define DO_VMOVN_SAT(OP, TOP, ESIZE, TYPE, LESIZE, LTYPE, FN)           \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm)         \
+    {                                                                   \
+        LTYPE *m = vm;                                                  \
+        TYPE *d = vd;                                                   \
+        uint16_t mask = mve_element_mask(env);                          \
+        bool qc = false;                                                \
+        unsigned le;                                                    \
+        mask >>= ESIZE * TOP;                                           \
+        for (le = 0; le < 16 / LESIZE; le++, mask >>= LESIZE) {         \
+            bool sat = false;                                           \
+            TYPE r = FN(m[H##LESIZE(le)], &sat);                        \
+            mergemask(&d[H##ESIZE(le * 2 + TOP)], r, mask);             \
+            qc |= sat & mask & 1;                                       \
+        }                                                               \
+        if (qc) {                                                       \
+            env->vfp.qc[0] = qc;                                        \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+#define DO_VMOVN_SAT_UB(BOP, TOP, FN)                           \
+    DO_VMOVN_SAT(BOP, false, 1, uint8_t, 2, uint16_t, FN)       \
+    DO_VMOVN_SAT(TOP, true, 1, uint8_t, 2, uint16_t, FN)
+
+#define DO_VMOVN_SAT_UH(BOP, TOP, FN)                           \
+    DO_VMOVN_SAT(BOP, false, 2, uint16_t, 4, uint32_t, FN)      \
+    DO_VMOVN_SAT(TOP, true, 2, uint16_t, 4, uint32_t, FN)
+
+#define DO_VMOVN_SAT_SB(BOP, TOP, FN)                           \
+    DO_VMOVN_SAT(BOP, false, 1, int8_t, 2, int16_t, FN)         \
+    DO_VMOVN_SAT(TOP, true, 1, int8_t, 2, int16_t, FN)
+
+#define DO_VMOVN_SAT_SH(BOP, TOP, FN)                           \
+    DO_VMOVN_SAT(BOP, false, 2, int16_t, 4, int32_t, FN)        \
+    DO_VMOVN_SAT(TOP, true, 2, int16_t, 4, int32_t, FN)
+
+#define DO_VQMOVN_SB(N, SATP)                           \
+    do_sat_bhs((int64_t)(N), INT8_MIN, INT8_MAX, SATP)
+#define DO_VQMOVN_UB(N, SATP)                           \
+    do_sat_bhs((uint64_t)(N), 0, UINT8_MAX, SATP)
+#define DO_VQMOVUN_B(N, SATP)                           \
+    do_sat_bhs((int64_t)(N), 0, UINT8_MAX, SATP)
+
+#define DO_VQMOVN_SH(N, SATP)                           \
+    do_sat_bhs((int64_t)(N), INT16_MIN, INT16_MAX, SATP)
+#define DO_VQMOVN_UH(N, SATP)                           \
+    do_sat_bhs((uint64_t)(N), 0, UINT16_MAX, SATP)
+#define DO_VQMOVUN_H(N, SATP)                           \
+    do_sat_bhs((int64_t)(N), 0, UINT16_MAX, SATP)
+
+DO_VMOVN_SAT_SB(vqmovnbsb, vqmovntsb, DO_VQMOVN_SB)
+DO_VMOVN_SAT_SH(vqmovnbsh, vqmovntsh, DO_VQMOVN_SH)
+DO_VMOVN_SAT_UB(vqmovnbub, vqmovntub, DO_VQMOVN_UB)
+DO_VMOVN_SAT_UH(vqmovnbuh, vqmovntuh, DO_VQMOVN_UH)
+DO_VMOVN_SAT_SB(vqmovunbb, vqmovuntb, DO_VQMOVUN_B)
+DO_VMOVN_SAT_SH(vqmovunbh, vqmovunth, DO_VQMOVUN_H)
+
 uint32_t HELPER(mve_vshlc)(CPUARMState *env, void *vd, uint32_t rdm,
                            uint32_t shift)
 {
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index c304b8d6e41..ba5b7809b09 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -275,6 +275,28 @@ DO_1OP(VCLS, vcls)
 DO_1OP(VABS, vabs)
 DO_1OP(VNEG, vneg)
 
+/* Narrowing moves: only size 0 and 1 are valid */
+#define DO_VMOVN(INSN, FN) \
+    static bool trans_##INSN(DisasContext *s, arg_1op *a)       \
+    {                                                           \
+        static MVEGenOneOpFn * const fns[] = {                  \
+            gen_helper_mve_##FN##b,                             \
+            gen_helper_mve_##FN##h,                             \
+            NULL,                                               \
+            NULL,                                               \
+        };                                                      \
+        return do_1op(s, a, fns[a->size]);                      \
+    }
+
+DO_VMOVN(VMOVNB, vmovnb)
+DO_VMOVN(VMOVNT, vmovnt)
+DO_VMOVN(VQMOVUNB, vqmovunb)
+DO_VMOVN(VQMOVUNT, vqmovunt)
+DO_VMOVN(VQMOVN_BS, vqmovnbs)
+DO_VMOVN(VQMOVN_TS, vqmovnts)
+DO_VMOVN(VQMOVN_BU, vqmovnbu)
+DO_VMOVN(VQMOVN_TU, vqmovntu)
+
 static bool trans_VREV16(DisasContext *s, arg_1op *a)
 {
     static MVEGenOneOpFn * const fns[] = {
-- 
2.20.1

[PATCH for-6.2 23/34] target/arm: Rename MVEGenDualAccOpFn to MVEGenLongDualAccOpFn

[Peter Maydell]

The MVEGenDualAccOpFn is a bit misnamed, since it is used for
the "long dual accumulate" operations that use a 64-bit
accumulator. Rename it to MVEGenLongDualAccOpFn so we can
use the former name for the 32-bit accumulator insns.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/translate-mve.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index ba5b7809b09..22b178296f4 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -38,7 +38,7 @@ typedef void MVEGenOneOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenTwoOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenTwoOpScalarFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenTwoOpShiftFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
-typedef void MVEGenDualAccOpFn(TCGv_i64, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i64);
+typedef void MVEGenLongDualAccOpFn(TCGv_i64, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i64);
 typedef void MVEGenVADDVFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenOneOpImmFn(TCGv_ptr, TCGv_ptr, TCGv_i64);
 typedef void MVEGenVIDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32);
@@ -653,7 +653,7 @@ static bool trans_VQDMULLT_scalar(DisasContext *s, arg_2scalar *a)
 }
 
 static bool do_long_dual_acc(DisasContext *s, arg_vmlaldav *a,
-                             MVEGenDualAccOpFn *fn)
+                             MVEGenLongDualAccOpFn *fn)
 {
     TCGv_ptr qn, qm;
     TCGv_i64 rda;
@@ -711,7 +711,7 @@ static bool do_long_dual_acc(DisasContext *s, arg_vmlaldav *a,
 
 static bool trans_VMLALDAV_S(DisasContext *s, arg_vmlaldav *a)
 {
-    static MVEGenDualAccOpFn * const fns[4][2] = {
+    static MVEGenLongDualAccOpFn * const fns[4][2] = {
         { NULL, NULL },
         { gen_helper_mve_vmlaldavsh, gen_helper_mve_vmlaldavxsh },
         { gen_helper_mve_vmlaldavsw, gen_helper_mve_vmlaldavxsw },
@@ -722,7 +722,7 @@ static bool trans_VMLALDAV_S(DisasContext *s, arg_vmlaldav *a)
 
 static bool trans_VMLALDAV_U(DisasContext *s, arg_vmlaldav *a)
 {
-    static MVEGenDualAccOpFn * const fns[4][2] = {
+    static MVEGenLongDualAccOpFn * const fns[4][2] = {
         { NULL, NULL },
         { gen_helper_mve_vmlaldavuh, NULL },
         { gen_helper_mve_vmlaldavuw, NULL },
@@ -733,7 +733,7 @@ static bool trans_VMLALDAV_U(DisasContext *s, arg_vmlaldav *a)
 
 static bool trans_VMLSLDAV(DisasContext *s, arg_vmlaldav *a)
 {
-    static MVEGenDualAccOpFn * const fns[4][2] = {
+    static MVEGenLongDualAccOpFn * const fns[4][2] = {
         { NULL, NULL },
         { gen_helper_mve_vmlsldavsh, gen_helper_mve_vmlsldavxsh },
         { gen_helper_mve_vmlsldavsw, gen_helper_mve_vmlsldavxsw },
@@ -744,7 +744,7 @@ static bool trans_VMLSLDAV(DisasContext *s, arg_vmlaldav *a)
 
 static bool trans_VRMLALDAVH_S(DisasContext *s, arg_vmlaldav *a)
 {
-    static MVEGenDualAccOpFn * const fns[] = {
+    static MVEGenLongDualAccOpFn * const fns[] = {
         gen_helper_mve_vrmlaldavhsw, gen_helper_mve_vrmlaldavhxsw,
     };
     return do_long_dual_acc(s, a, fns[a->x]);
@@ -752,7 +752,7 @@ static bool trans_VRMLALDAVH_S(DisasContext *s, arg_vmlaldav *a)
 
 static bool trans_VRMLALDAVH_U(DisasContext *s, arg_vmlaldav *a)
 {
-    static MVEGenDualAccOpFn * const fns[] = {
+    static MVEGenLongDualAccOpFn * const fns[] = {
         gen_helper_mve_vrmlaldavhuw, NULL,
     };
     return do_long_dual_acc(s, a, fns[a->x]);
@@ -760,7 +760,7 @@ static bool trans_VRMLALDAVH_U(DisasContext *s, arg_vmlaldav *a)
 
 static bool trans_VRMLSLDAVH(DisasContext *s, arg_vmlaldav *a)
 {
-    static MVEGenDualAccOpFn * const fns[] = {
+    static MVEGenLongDualAccOpFn * const fns[] = {
         gen_helper_mve_vrmlsldavhsw, gen_helper_mve_vrmlsldavhxsw,
     };
     return do_long_dual_acc(s, a, fns[a->x]);
-- 
2.20.1

[PATCH for-6.2 24/34] target/arm: Implement MVE VMLADAV and VMLSLDAV

[Peter Maydell]

Implement the MVE VMLADAV and VMLSLDAV insns.  Like the VMLALDAV and
VMLSLDAV insns already implemented, these accumulate multiplied
vector elements; but they accumulate a 32-bit result rather than a
64-bit one.

Note that these encodings overlap with what would be RdaHi=0b111 for
VMLALDAV, VMLSLDAV, VRMLALDAVH and VRMLSLDAVH.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 17 ++++++++++
 target/arm/mve.decode      | 33 +++++++++++++++++---
 target/arm/mve_helper.c    | 41 ++++++++++++++++++++++++
 target/arm/translate-mve.c | 64 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 150 insertions(+), 5 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 84aa9de6e06..088bdd3ca50 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -400,6 +400,23 @@ DEF_HELPER_FLAGS_4(mve_vrmlaldavhuw, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 DEF_HELPER_FLAGS_4(mve_vrmlsldavhsw, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 DEF_HELPER_FLAGS_4(mve_vrmlsldavhxsw, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 
+DEF_HELPER_FLAGS_4(mve_vmladavsb, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavsh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavsw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavub, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavuh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavuw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlsdavb, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlsdavh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlsdavw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vmladavsxb, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavsxh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmladavsxw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlsdavxb, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlsdavxh, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlsdavxw, TCG_CALL_NO_WG, i32, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_3(mve_vaddvsb, TCG_CALL_NO_WG, i32, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vaddvub, TCG_CALL_NO_WG, i32, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vaddvsh, TCG_CALL_NO_WG, i32, env, ptr, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 79c529e762f..0c4708ea988 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -320,32 +320,55 @@ VDUP             1110 1110 1 0 10 ... 0 .... 1011 . 0 0 1 0000 @vdup size=2
 %size_16 16:1 !function=plus_1
 
 &vmlaldav rdahi rdalo size qn qm x a
+&vmladav rda size qn qm x a
 
 @vmlaldav        .... .... . ... ... . ... x:1 .... .. a:1 . qm:3 . \
                  qn=%qn rdahi=%rdahi rdalo=%rdalo size=%size_16 &vmlaldav
 @vmlaldav_nosz   .... .... . ... ... . ... x:1 .... .. a:1 . qm:3 . \
                  qn=%qn rdahi=%rdahi rdalo=%rdalo size=0 &vmlaldav
-VMLALDAV_S       1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
-VMLALDAV_U       1111 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
+@vmladav         .... .... .... ... . ... x:1 .... . . a:1 . qm:3 . \
+                 qn=%qn rda=%rdalo size=%size_16 &vmladav
+@vmladav_nosz    .... .... .... ... . ... x:1 .... . . a:1 . qm:3 . \
+                 qn=%qn rda=%rdalo size=0 &vmladav
 
-VMLSLDAV         1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 1 @vmlaldav
+{
+  VMLADAV_S      1110 1110 1111  ... . ... . 1110 . 0 . 0 ... 0 @vmladav
+  VMLALDAV_S     1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
+}
+{
+  VMLADAV_U      1111 1110 1111  ... . ... . 1110 . 0 . 0 ... 0 @vmladav
+  VMLALDAV_U     1111 1110 1 ... ... . ... . 1110 . 0 . 0 ... 0 @vmlaldav
+}
+
+{
+  VMLSDAV        1110 1110 1111  ... . ... . 1110 . 0 . 0 ... 1 @vmladav
+  VMLSLDAV       1110 1110 1 ... ... . ... . 1110 . 0 . 0 ... 1 @vmlaldav
+}
+
+{
+  VMLSDAV        1111 1110 1111  ... 0 ... . 1110 . 0 . 0 ... 1 @vmladav_nosz
+  VRMLSLDAVH     1111 1110 1 ... ... 0 ... . 1110 . 0 . 0 ... 1 @vmlaldav_nosz
+}
+
+VMLADAV_S        1110 1110 1111  ... 0 ... . 1111 . 0 . 0 ... 1 @vmladav_nosz
+VMLADAV_U        1111 1110 1111  ... 0 ... . 1111 . 0 . 0 ... 1 @vmladav_nosz
 
 {
   VMAXV_S        1110 1110 1110  .. 10 ....  1111 0 0 . 0 ... 0 @vmaxv
   VMINV_S        1110 1110 1110  .. 10 ....  1111 1 0 . 0 ... 0 @vmaxv
   VMAXAV         1110 1110 1110  .. 00 ....  1111 0 0 . 0 ... 0 @vmaxv
   VMINAV         1110 1110 1110  .. 00 ....  1111 1 0 . 0 ... 0 @vmaxv
+  VMLADAV_S      1110 1110 1111  ... 0 ... . 1111 . 0 . 0 ... 0 @vmladav_nosz
   VRMLALDAVH_S   1110 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
 }
 
 {
   VMAXV_U        1111 1110 1110  .. 10 ....  1111 0 0 . 0 ... 0 @vmaxv
   VMINV_U        1111 1110 1110  .. 10 ....  1111 1 0 . 0 ... 0 @vmaxv
+  VMLADAV_U      1111 1110 1111  ... 0 ... . 1111 . 0 . 0 ... 0 @vmladav_nosz
   VRMLALDAVH_U   1111 1110 1 ... ... 0 ... . 1111 . 0 . 0 ... 0 @vmlaldav_nosz
 }
 
-VRMLSLDAVH       1111 1110 1 ... ... 0 ... . 1110 . 0 . 0 ... 1 @vmlaldav_nosz
-
 # Scalar operations
 
 VADD_scalar      1110 1110 0 . .. ... 1 ... 0 1111 . 100 .... @2scalar
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 725fe64a348..8b70362f012 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1201,6 +1201,47 @@ DO_LDAV(vmlsldavxsh, 2, int16_t, true, +=, -=)
 DO_LDAV(vmlsldavsw, 4, int32_t, false, +=, -=)
 DO_LDAV(vmlsldavxsw, 4, int32_t, true, +=, -=)
 
+/*
+ * Multiply add dual accumulate ops
+ */
+#define DO_DAV(OP, ESIZE, TYPE, XCHG, EVENACC, ODDACC) \
+    uint32_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vn,         \
+                                    void *vm, uint32_t a)               \
+    {                                                                   \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        TYPE *n = vn, *m = vm;                                          \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+            if (mask & 1) {                                             \
+                if (e & 1) {                                            \
+                    a ODDACC                                            \
+                        n[H##ESIZE(e - 1 * XCHG)] * m[H##ESIZE(e)];     \
+                } else {                                                \
+                    a EVENACC                                           \
+                        n[H##ESIZE(e + 1 * XCHG)] * m[H##ESIZE(e)];     \
+                }                                                       \
+            }                                                           \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+        return a;                                                       \
+    }
+
+#define DO_DAV_S(INSN, XCHG, EVENACC, ODDACC)           \
+    DO_DAV(INSN##b, 1, int8_t, XCHG, EVENACC, ODDACC)   \
+    DO_DAV(INSN##h, 2, int16_t, XCHG, EVENACC, ODDACC)  \
+    DO_DAV(INSN##w, 4, int32_t, XCHG, EVENACC, ODDACC)
+
+#define DO_DAV_U(INSN, XCHG, EVENACC, ODDACC)           \
+    DO_DAV(INSN##b, 1, uint8_t, XCHG, EVENACC, ODDACC)  \
+    DO_DAV(INSN##h, 2, uint16_t, XCHG, EVENACC, ODDACC) \
+    DO_DAV(INSN##w, 4, uint32_t, XCHG, EVENACC, ODDACC)
+
+DO_DAV_S(vmladavs, false, +=, +=)
+DO_DAV_U(vmladavu, false, +=, +=)
+DO_DAV_S(vmlsdav, false, +=, -=)
+DO_DAV_S(vmladavsx, true, +=, +=)
+DO_DAV_S(vmlsdavx, true, +=, -=)
+
 /*
  * Rounding multiply add long dual accumulate high. In the pseudocode
  * this is implemented with a 72-bit internal accumulator value of which
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 22b178296f4..67b9c07447a 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -46,6 +46,7 @@ typedef void MVEGenVIWDUPFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_i32, TCGv_i32, TC
 typedef void MVEGenCmpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenScalarCmpFn(TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenVABAVFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
+typedef void MVEGenDualAccOpFn(TCGv_i32, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
 
 /* Return the offset of a Qn register (same semantics as aa32_vfp_qreg()) */
 static inline long mve_qreg_offset(unsigned reg)
@@ -766,6 +767,69 @@ static bool trans_VRMLSLDAVH(DisasContext *s, arg_vmlaldav *a)
     return do_long_dual_acc(s, a, fns[a->x]);
 }
 
+static bool do_dual_acc(DisasContext *s, arg_vmladav *a, MVEGenDualAccOpFn *fn)
+{
+    TCGv_ptr qn, qm;
+    TCGv_i32 rda;
+
+    if (!dc_isar_feature(aa32_mve, s) ||
+        !mve_check_qreg_bank(s, a->qn) ||
+        !fn) {
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    qn = mve_qreg_ptr(a->qn);
+    qm = mve_qreg_ptr(a->qm);
+
+    /*
+     * This insn is subject to beat-wise execution. Partial execution
+     * of an A=0 (no-accumulate) insn which does not execute the first
+     * beat must start with the current rda value, not 0.
+     */
+    if (a->a || mve_skip_first_beat(s)) {
+        rda = load_reg(s, a->rda);
+    } else {
+        rda = tcg_const_i32(0);
+    }
+
+    fn(rda, cpu_env, qn, qm, rda);
+    store_reg(s, a->rda, rda);
+    tcg_temp_free_ptr(qn);
+    tcg_temp_free_ptr(qm);
+
+    mve_update_eci(s);
+    return true;
+}
+
+#define DO_DUAL_ACC(INSN, FN)                                           \
+    static bool trans_##INSN(DisasContext *s, arg_vmladav *a)           \
+    {                                                                   \
+        static MVEGenDualAccOpFn * const fns[4][2] = {                  \
+            { gen_helper_mve_##FN##b, gen_helper_mve_##FN##xb },        \
+            { gen_helper_mve_##FN##h, gen_helper_mve_##FN##xh },        \
+            { gen_helper_mve_##FN##w, gen_helper_mve_##FN##xw },        \
+            { NULL, NULL },                                             \
+        };                                                              \
+        return do_dual_acc(s, a, fns[a->size][a->x]);                   \
+    }
+
+DO_DUAL_ACC(VMLADAV_S, vmladavs)
+DO_DUAL_ACC(VMLSDAV, vmlsdav)
+
+static bool trans_VMLADAV_U(DisasContext *s, arg_vmladav *a)
+{
+    static MVEGenDualAccOpFn * const fns[4][2] = {
+        { gen_helper_mve_vmladavub, NULL },
+        { gen_helper_mve_vmladavuh, NULL },
+        { gen_helper_mve_vmladavuw, NULL },
+        { NULL, NULL },
+    };
+    return do_dual_acc(s, a, fns[a->size][a->x]);
+}
+
 static void gen_vpst(DisasContext *s, uint32_t mask)
 {
     /*
-- 
2.20.1

[PATCH for-6.2 25/34] target/arm: Implement MVE VMLA

[Peter Maydell]

Implement the MVE VMLA insn, which multiplies a vector by a scalar
and accumulates into another vector.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 8 ++++++++
 target/arm/mve.decode      | 3 +++
 target/arm/mve_helper.c    | 6 ++++++
 target/arm/translate-mve.c | 2 ++
 4 files changed, 19 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 088bdd3ca50..50b34c601e1 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -371,6 +371,14 @@ DEF_HELPER_FLAGS_4(mve_vqdmullb_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i3
 DEF_HELPER_FLAGS_4(mve_vqdmullt_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vqdmullt_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vmlasb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlash, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlasw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vmlaub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlauh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vmlauw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_4(mve_vmlassb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vmlassh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vmlassw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 0c4708ea988..2e2df61c860 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -412,6 +412,9 @@ VHSUB_U_scalar   1111 1110 0 . .. ... 0 ... 1 1111 . 100 .... @2scalar
 VQDMULH_scalar   1110 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 VQRDMULH_scalar  1111 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
 
+VMLA_S           1110 1110 0 . .. ... 1 ... 0 1110 . 100 .... @2scalar
+VMLA_U           1111 1110 0 . .. ... 1 ... 0 1110 . 100 .... @2scalar
+
 VMLAS_S          1110 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
 VMLAS_U          1111 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
 
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 8b70362f012..91c0add8da7 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -1019,6 +1019,12 @@ DO_2OP_SAT_SCALAR(vqrdmulh_scalarb, 1, int8_t, DO_QRDMULH_B)
 DO_2OP_SAT_SCALAR(vqrdmulh_scalarh, 2, int16_t, DO_QRDMULH_H)
 DO_2OP_SAT_SCALAR(vqrdmulh_scalarw, 4, int32_t, DO_QRDMULH_W)
 
+/* Vector by scalar plus vector */
+#define DO_VMLA(D, N, M) ((N) * (M) + (D))
+
+DO_2OP_ACC_SCALAR_S(vmlas, DO_VMLA)
+DO_2OP_ACC_SCALAR_U(vmlau, DO_VMLA)
+
 /* Vector by vector plus scalar */
 #define DO_VMLAS(D, N, M) ((N) * (D) + (M))
 
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 67b9c07447a..650f3b95edf 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -620,6 +620,8 @@ DO_2OP_SCALAR(VQSUB_U_scalar, vqsubu_scalar)
 DO_2OP_SCALAR(VQDMULH_scalar, vqdmulh_scalar)
 DO_2OP_SCALAR(VQRDMULH_scalar, vqrdmulh_scalar)
 DO_2OP_SCALAR(VBRSR, vbrsr)
+DO_2OP_SCALAR(VMLA_S, vmlas)
+DO_2OP_SCALAR(VMLA_U, vmlau)
 DO_2OP_SCALAR(VMLAS_S, vmlass)
 DO_2OP_SCALAR(VMLAS_U, vmlasu)
 
-- 
2.20.1

[PATCH for-6.2 26/34] target/arm: Implement MVE saturating doubling multiply accumulates

[Peter Maydell]

Implement the MVE saturating doubling multiply accumulate insns
VQDMLAH, VQRDMLAH, VQDMLASH and VQRDMLASH.  These perform a multiply,
double, add the accumulator shifted by the element size, possibly
round, saturate to twice the element size, then take the high half of
the result.  The *MLAH insns do vector * scalar + vector, and the
*MLASH insns do vector * vector + scalar.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    | 16 +++++++
 target/arm/mve.decode      |  5 ++
 target/arm/mve_helper.c    | 95 ++++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c |  4 ++
 4 files changed, 120 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 50b34c601e1..e61c5d56f41 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -387,6 +387,22 @@ DEF_HELPER_FLAGS_4(mve_vmlasub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vmlasuh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vmlasuw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vqdmlahb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqdmlahh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqdmlahw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vqrdmlahb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrdmlahh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrdmlahw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vqdmlashb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqdmlashh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqdmlashw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vqrdmlashb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrdmlashh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vqrdmlashw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_4(mve_vmlaldavsh, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 DEF_HELPER_FLAGS_4(mve_vmlaldavsw, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
 DEF_HELPER_FLAGS_4(mve_vmlaldavxsh, TCG_CALL_NO_WG, i64, env, ptr, ptr, i64)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 2e2df61c860..99cea8d39b6 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -418,6 +418,11 @@ VMLA_U           1111 1110 0 . .. ... 1 ... 0 1110 . 100 .... @2scalar
 VMLAS_S          1110 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
 VMLAS_U          1111 1110 0 . .. ... 1 ... 1 1110 . 100 .... @2scalar
 
+VQRDMLAH         1110 1110 0 . .. ... 0 ... 0 1110 . 100 .... @2scalar
+VQRDMLASH        1110 1110 0 . .. ... 0 ... 1 1110 . 100 .... @2scalar
+VQDMLAH          1110 1110 0 . .. ... 0 ... 0 1110 . 110 .... @2scalar
+VQDMLASH         1110 1110 0 . .. ... 0 ... 1 1110 . 110 .... @2scalar
+
 # Vector add across vector
 {
   VADDV          111 u:1 1110 1111 size:2 01 ... 0 1111 0 0 a:1 0 qm:3 0 rda=%rdalo
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 91c0add8da7..1013060baeb 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -971,6 +971,28 @@ DO_VQDMLADH_OP(vqrdmlsdhxw, 4, int32_t, 1, 1, do_vqdmlsdh_w)
         mve_advance_vpt(env);                                           \
     }
 
+#define DO_2OP_SAT_ACC_SCALAR(OP, ESIZE, TYPE, FN)                      \
+    void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, void *vn,   \
+                                uint32_t rm)                            \
+    {                                                                   \
+        TYPE *d = vd, *n = vn;                                          \
+        TYPE m = rm;                                                    \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        bool qc = false;                                                \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+            bool sat = false;                                           \
+            mergemask(&d[H##ESIZE(e)],                                  \
+                      FN(d[H##ESIZE(e)], n[H##ESIZE(e)], m, &sat),      \
+                      mask);                                            \
+            qc |= sat & mask & 1;                                       \
+        }                                                               \
+        if (qc) {                                                       \
+            env->vfp.qc[0] = qc;                                        \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
 /* provide unsigned 2-op scalar helpers for all sizes */
 #define DO_2OP_SCALAR_U(OP, FN)                 \
     DO_2OP_SCALAR(OP##b, 1, uint8_t, FN)        \
@@ -1019,6 +1041,79 @@ DO_2OP_SAT_SCALAR(vqrdmulh_scalarb, 1, int8_t, DO_QRDMULH_B)
 DO_2OP_SAT_SCALAR(vqrdmulh_scalarh, 2, int16_t, DO_QRDMULH_H)
 DO_2OP_SAT_SCALAR(vqrdmulh_scalarw, 4, int32_t, DO_QRDMULH_W)
 
+static int8_t do_vqdmlah_b(int8_t a, int8_t b, int8_t c, int round, bool *sat)
+{
+    int64_t r = (int64_t)a * b * 2 + ((int64_t)c << 8) + (round << 7);
+    return do_sat_bhw(r, INT16_MIN, INT16_MAX, sat) >> 8;
+}
+
+static int16_t do_vqdmlah_h(int16_t a, int16_t b, int16_t c,
+                           int round, bool *sat)
+{
+    int64_t r = (int64_t)a * b * 2 + ((int64_t)c << 16) + (round << 15);
+    return do_sat_bhw(r, INT32_MIN, INT32_MAX, sat) >> 16;
+}
+
+static int32_t do_vqdmlah_w(int32_t a, int32_t b, int32_t c,
+                            int round, bool *sat)
+{
+    /*
+     * Architecturally we should do the entire add, double, round
+     * and then check for saturation. We do three saturating adds,
+     * but we need to be careful about the order. If the first
+     * m1 + m2 saturates then it's impossible for the *2+rc to
+     * bring it back into the non-saturated range. However, if
+     * m1 + m2 is negative then it's possible that doing the doubling
+     * would take the intermediate result below INT64_MAX and the
+     * addition of the rounding constant then brings it back in range.
+     * So we add half the rounding constant and half the "c << esize"
+     * before doubling rather than adding the rounding constant after
+     * the doubling.
+     */
+    int64_t m1 = (int64_t)a * b;
+    int64_t m2 = (int64_t)c << 31;
+    int64_t r;
+    if (sadd64_overflow(m1, m2, &r) ||
+        sadd64_overflow(r, (round << 30), &r) ||
+        sadd64_overflow(r, r, &r)) {
+        *sat = true;
+        return r < 0 ? INT32_MAX : INT32_MIN;
+    }
+    return r >> 32;
+}
+
+/*
+ * The *MLAH insns are vector * scalar + vector;
+ * the *MLASH insns are vector * vector + scalar
+ */
+#define DO_VQDMLAH_B(D, N, M, S) do_vqdmlah_b(N, M, D, 0, S)
+#define DO_VQDMLAH_H(D, N, M, S) do_vqdmlah_h(N, M, D, 0, S)
+#define DO_VQDMLAH_W(D, N, M, S) do_vqdmlah_w(N, M, D, 0, S)
+#define DO_VQRDMLAH_B(D, N, M, S) do_vqdmlah_b(N, M, D, 1, S)
+#define DO_VQRDMLAH_H(D, N, M, S) do_vqdmlah_h(N, M, D, 1, S)
+#define DO_VQRDMLAH_W(D, N, M, S) do_vqdmlah_w(N, M, D, 1, S)
+
+#define DO_VQDMLASH_B(D, N, M, S) do_vqdmlah_b(N, D, M, 0, S)
+#define DO_VQDMLASH_H(D, N, M, S) do_vqdmlah_h(N, D, M, 0, S)
+#define DO_VQDMLASH_W(D, N, M, S) do_vqdmlah_w(N, D, M, 0, S)
+#define DO_VQRDMLASH_B(D, N, M, S) do_vqdmlah_b(N, D, M, 1, S)
+#define DO_VQRDMLASH_H(D, N, M, S) do_vqdmlah_h(N, D, M, 1, S)
+#define DO_VQRDMLASH_W(D, N, M, S) do_vqdmlah_w(N, D, M, 1, S)
+
+DO_2OP_SAT_ACC_SCALAR(vqdmlahb, 1, int8_t, DO_VQDMLAH_B)
+DO_2OP_SAT_ACC_SCALAR(vqdmlahh, 2, int16_t, DO_VQDMLAH_H)
+DO_2OP_SAT_ACC_SCALAR(vqdmlahw, 4, int32_t, DO_VQDMLAH_W)
+DO_2OP_SAT_ACC_SCALAR(vqrdmlahb, 1, int8_t, DO_VQRDMLAH_B)
+DO_2OP_SAT_ACC_SCALAR(vqrdmlahh, 2, int16_t, DO_VQRDMLAH_H)
+DO_2OP_SAT_ACC_SCALAR(vqrdmlahw, 4, int32_t, DO_VQRDMLAH_W)
+
+DO_2OP_SAT_ACC_SCALAR(vqdmlashb, 1, int8_t, DO_VQDMLASH_B)
+DO_2OP_SAT_ACC_SCALAR(vqdmlashh, 2, int16_t, DO_VQDMLASH_H)
+DO_2OP_SAT_ACC_SCALAR(vqdmlashw, 4, int32_t, DO_VQDMLASH_W)
+DO_2OP_SAT_ACC_SCALAR(vqrdmlashb, 1, int8_t, DO_VQRDMLASH_B)
+DO_2OP_SAT_ACC_SCALAR(vqrdmlashh, 2, int16_t, DO_VQRDMLASH_H)
+DO_2OP_SAT_ACC_SCALAR(vqrdmlashw, 4, int32_t, DO_VQRDMLASH_W)
+
 /* Vector by scalar plus vector */
 #define DO_VMLA(D, N, M) ((N) * (M) + (D))
 
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 650f3b95edf..f8b34c9ef36 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -624,6 +624,10 @@ DO_2OP_SCALAR(VMLA_S, vmlas)
 DO_2OP_SCALAR(VMLA_U, vmlau)
 DO_2OP_SCALAR(VMLAS_S, vmlass)
 DO_2OP_SCALAR(VMLAS_U, vmlasu)
+DO_2OP_SCALAR(VQDMLAH, vqdmlah)
+DO_2OP_SCALAR(VQRDMLAH, vqrdmlah)
+DO_2OP_SCALAR(VQDMLASH, vqdmlash)
+DO_2OP_SCALAR(VQRDMLASH, vqrdmlash)
 
 static bool trans_VQDMULLB_scalar(DisasContext *s, arg_2scalar *a)
 {
-- 
2.20.1

[PATCH for-6.2 27/34] target/arm: Implement MVE VQABS, VQNEG

[Peter Maydell]

Implement the MVE 1-operand saturating operations VQABS and VQNEG.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  8 ++++++++
 target/arm/mve.decode      |  3 +++
 target/arm/mve_helper.c    | 37 +++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c |  2 ++
 4 files changed, 50 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index e61c5d56f41..69f0474f6a3 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -80,6 +80,14 @@ DEF_HELPER_FLAGS_3(mve_vnegw, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vfnegh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vfnegs, TCG_CALL_NO_WG, void, env, ptr, ptr)
 
+DEF_HELPER_FLAGS_3(mve_vqabsb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqabsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqabsw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vqnegb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqnegh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vqnegw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
 DEF_HELPER_FLAGS_3(mve_vmovnbb, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vmovnbh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vmovntb, TCG_CALL_NO_WG, void, env, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 99cea8d39b6..1d38dd8dba3 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -279,6 +279,9 @@ VABS_fp          1111 1111 1 . 11 .. 01 ... 0 0111 01 . 0 ... 0 @1op
 VNEG             1111 1111 1 . 11 .. 01 ... 0 0011 11 . 0 ... 0 @1op
 VNEG_fp          1111 1111 1 . 11 .. 01 ... 0 0111 11 . 0 ... 0 @1op
 
+VQABS            1111 1111 1 . 11 .. 00 ... 0 0111 01 . 0 ... 0 @1op
+VQNEG            1111 1111 1 . 11 .. 00 ... 0 0111 11 . 0 ... 0 @1op
+
 &vdup qd rt size
 # Qd is in the fields usually named Qn
 @vdup            .... .... . . .. ... . rt:4 .... . . . . .... qd=%qn &vdup
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 1013060baeb..3b3695885ef 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -2213,3 +2213,40 @@ void HELPER(mve_vpsel)(CPUARMState *env, void *vd, void *vn, void *vm)
     }
     mve_advance_vpt(env);
 }
+
+#define DO_1OP_SAT(OP, ESIZE, TYPE, FN)                                 \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm)         \
+    {                                                                   \
+        TYPE *d = vd, *m = vm;                                          \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        bool qc = false;                                                \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+            bool sat = false;                                           \
+            mergemask(&d[H##ESIZE(e)], FN(m[H##ESIZE(e)], &sat), mask); \
+            qc |= sat & mask & 1;                                       \
+        }                                                               \
+        if (qc) {                                                       \
+            env->vfp.qc[0] = qc;                                        \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+#define DO_VQABS_B(N, SATP) \
+    do_sat_bhs(DO_ABS((int64_t)N), INT8_MIN, INT8_MAX, SATP)
+#define DO_VQABS_H(N, SATP) \
+    do_sat_bhs(DO_ABS((int64_t)N), INT16_MIN, INT16_MAX, SATP)
+#define DO_VQABS_W(N, SATP) \
+    do_sat_bhs(DO_ABS((int64_t)N), INT32_MIN, INT32_MAX, SATP)
+
+#define DO_VQNEG_B(N, SATP) do_sat_bhs(-(int64_t)N, INT8_MIN, INT8_MAX, SATP)
+#define DO_VQNEG_H(N, SATP) do_sat_bhs(-(int64_t)N, INT16_MIN, INT16_MAX, SATP)
+#define DO_VQNEG_W(N, SATP) do_sat_bhs(-(int64_t)N, INT32_MIN, INT32_MAX, SATP)
+
+DO_1OP_SAT(vqabsb, 1, int8_t, DO_VQABS_B)
+DO_1OP_SAT(vqabsh, 2, int16_t, DO_VQABS_H)
+DO_1OP_SAT(vqabsw, 4, int32_t, DO_VQABS_W)
+
+DO_1OP_SAT(vqnegb, 1, int8_t, DO_VQNEG_B)
+DO_1OP_SAT(vqnegh, 2, int16_t, DO_VQNEG_H)
+DO_1OP_SAT(vqnegw, 4, int32_t, DO_VQNEG_W)
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index f8b34c9ef36..59e09f58a8c 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -275,6 +275,8 @@ DO_1OP(VCLZ, vclz)
 DO_1OP(VCLS, vcls)
 DO_1OP(VABS, vabs)
 DO_1OP(VNEG, vneg)
+DO_1OP(VQABS, vqabs)
+DO_1OP(VQNEG, vqneg)
 
 /* Narrowing moves: only size 0 and 1 are valid */
 #define DO_VMOVN(INSN, FN) \
-- 
2.20.1

[PATCH for-6.2 28/34] target/arm: Implement MVE VMAXA, VMINA

[Peter Maydell]

Implement the MVE VMAXA and VMINA insns, which take the absolute
value of the signed elements in the input vector and then accumulate
the unsigned max or min into the destination vector.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  8 ++++++++
 target/arm/mve.decode      |  4 ++++
 target/arm/mve_helper.c    | 26 ++++++++++++++++++++++++++
 target/arm/translate-mve.c |  2 ++
 4 files changed, 40 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 69f0474f6a3..c36640e75e9 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -88,6 +88,14 @@ DEF_HELPER_FLAGS_3(mve_vqnegb, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vqnegh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vqnegw, TCG_CALL_NO_WG, void, env, ptr, ptr)
 
+DEF_HELPER_FLAGS_3(mve_vmaxab, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vmaxah, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vmaxaw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vminab, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vminah, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vminaw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
 DEF_HELPER_FLAGS_3(mve_vmovnbb, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vmovnbh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vmovntb, TCG_CALL_NO_WG, void, env, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 1d38dd8dba3..3899937f033 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -156,6 +156,8 @@ VMUL             1110 1111 0 . .. ... 0 ... 0 1001 . 1 . 1 ... 0 @2op
   VQMOVUNB       111 0 1110 0 . 11 .. 01 ... 0 1110 1 0 . 0 ... 1 @1op
   VQMOVN_BS      111 0 1110 0 . 11 .. 11 ... 0 1110 0 0 . 0 ... 1 @1op
 
+  VMAXA          111 0 1110 0 . 11 .. 11 ... 0 1110 1 0 . 0 ... 1 @1op
+
   VMULH_S        111 0 1110 0 . .. ...1 ... 0 1110 . 0 . 0 ... 1 @2op
 }
 
@@ -176,6 +178,8 @@ VMUL             1110 1111 0 . .. ... 0 ... 0 1001 . 1 . 1 ... 0 @2op
   VQMOVUNT       111 0 1110 0 . 11 .. 01 ... 1 1110 1 0 . 0 ... 1 @1op
   VQMOVN_TS      111 0 1110 0 . 11 .. 11 ... 1 1110 0 0 . 0 ... 1 @1op
 
+  VMINA          111 0 1110 0 . 11 .. 11 ... 1 1110 1 0 . 0 ... 1 @1op
+
   VRMULH_S       111 0 1110 0 . .. ...1 ... 1 1110 . 0 . 0 ... 1 @2op
 }
 
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 3b3695885ef..40e652229d6 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -2250,3 +2250,29 @@ DO_1OP_SAT(vqabsw, 4, int32_t, DO_VQABS_W)
 DO_1OP_SAT(vqnegb, 1, int8_t, DO_VQNEG_B)
 DO_1OP_SAT(vqnegh, 2, int16_t, DO_VQNEG_H)
 DO_1OP_SAT(vqnegw, 4, int32_t, DO_VQNEG_W)
+
+/*
+ * VMAXA, VMINA: vd is unsigned; vm is signed, and we take its
+ * absolute value; we then do an unsigned comparison.
+ */
+#define DO_VMAXMINA(OP, ESIZE, STYPE, UTYPE, FN)                        \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm)         \
+    {                                                                   \
+        UTYPE *d = vd;                                                  \
+        STYPE *m = vm;                                                  \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+            UTYPE r = DO_ABS(m[H##ESIZE(e)]);                           \
+            r = FN(d[H##ESIZE(e)], r);                                  \
+            mergemask(&d[H##ESIZE(e)], r, mask);                        \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+DO_VMAXMINA(vmaxab, 1, int8_t, uint8_t, DO_MAX)
+DO_VMAXMINA(vmaxah, 2, int16_t, uint16_t, DO_MAX)
+DO_VMAXMINA(vmaxaw, 4, int32_t, uint32_t, DO_MAX)
+DO_VMAXMINA(vminab, 1, int8_t, uint8_t, DO_MIN)
+DO_VMAXMINA(vminah, 2, int16_t, uint16_t, DO_MIN)
+DO_VMAXMINA(vminaw, 4, int32_t, uint32_t, DO_MIN)
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 59e09f58a8c..f243c34bd21 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -277,6 +277,8 @@ DO_1OP(VABS, vabs)
 DO_1OP(VNEG, vneg)
 DO_1OP(VQABS, vqabs)
 DO_1OP(VQNEG, vqneg)
+DO_1OP(VMAXA, vmaxa)
+DO_1OP(VMINA, vmina)
 
 /* Narrowing moves: only size 0 and 1 are valid */
 #define DO_VMOVN(INSN, FN) \
-- 
2.20.1

[PATCH for-6.2 29/34] target/arm: Implement MVE VMOV to/from 2 general-purpose registers

[Peter Maydell]

Implement the MVE VMOV forms that move data between 2 general-purpose
registers and 2 32-bit lanes in a vector register.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/translate-a32.h |  1 +
 target/arm/mve.decode      |  4 ++
 target/arm/translate-mve.c | 85 ++++++++++++++++++++++++++++++++++++++
 target/arm/translate-vfp.c |  2 +-
 4 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/target/arm/translate-a32.h b/target/arm/translate-a32.h
index 6dfcafe1796..6f4d65ddb00 100644
--- a/target/arm/translate-a32.h
+++ b/target/arm/translate-a32.h
@@ -49,6 +49,7 @@ void gen_rev16(TCGv_i32 dest, TCGv_i32 var);
 void clear_eci_state(DisasContext *s);
 bool mve_eci_check(DisasContext *s);
 void mve_update_and_store_eci(DisasContext *s);
+bool mve_skip_vmov(DisasContext *s, int vn, int index, int size);
 
 static inline TCGv_i32 load_cpu_offset(int offset)
 {
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 3899937f033..6ac9cb8e4d4 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -136,6 +136,10 @@ VLDR_VSTR        1110110 1 a:1 . w:1 . .... ... 111101 .......   @vldr_vstr \
 VLDR_VSTR        1110110 1 a:1 . w:1 . .... ... 111110 .......   @vldr_vstr \
                  size=2 p=1
 
+# Moves between 2 32-bit vector lanes and 2 general purpose registers
+VMOV_to_2gp      1110 1100 0 . 00 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
+VMOV_from_2gp    1110 1100 0 . 01 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
+
 # Vector 2-op
 VAND             1110 1111 0 . 00 ... 0 ... 0 0001 . 1 . 1 ... 0 @2op_nosz
 VBIC             1110 1111 0 . 01 ... 0 ... 0 0001 . 1 . 1 ... 0 @2op_nosz
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index f243c34bd21..43f917e609e 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -1507,3 +1507,88 @@ static bool do_vabav(DisasContext *s, arg_vabav *a, MVEGenVABAVFn *fn)
 
 DO_VABAV(VABAV_S, vabavs)
 DO_VABAV(VABAV_U, vabavu)
+
+static bool trans_VMOV_to_2gp(DisasContext *s, arg_VMOV_to_2gp *a)
+{
+    /*
+     * VMOV two 32-bit vector lanes to two general-purpose registers.
+     * This insn is not predicated but it is subject to beat-wise
+     * execution if it is not in an IT block. For us this means
+     * only that if PSR.ECI says we should not be executing the beat
+     * corresponding to the lane of the vector register being accessed
+     * then we should skip perfoming the move, and that we need to do
+     * the usual check for bad ECI state and advance of ECI state.
+     * (If PSR.ECI is non-zero then we cannot be in an IT block.)
+     */
+    TCGv_i32 tmp;
+    int vd;
+
+    if (!dc_isar_feature(aa32_mve, s) || !mve_check_qreg_bank(s, a->qd) ||
+        a->rt == 13 || a->rt == 15 || a->rt2 == 13 || a->rt2 == 15 ||
+        a->rt == a->rt2) {
+        /* Rt/Rt2 cases are UNPREDICTABLE */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    /* Convert Qreg index to Dreg for read_neon_element32() etc */
+    vd = a->qd * 2;
+
+    if (!mve_skip_vmov(s, vd, a->idx, MO_32)) {
+        tmp = tcg_temp_new_i32();
+        read_neon_element32(tmp, vd, a->idx, MO_32);
+        store_reg(s, a->rt, tmp);
+    }
+    if (!mve_skip_vmov(s, vd + 1, a->idx, MO_32)) {
+        tmp = tcg_temp_new_i32();
+        read_neon_element32(tmp, vd + 1, a->idx, MO_32);
+        store_reg(s, a->rt2, tmp);
+    }
+
+    mve_update_and_store_eci(s);
+    return true;
+}
+
+static bool trans_VMOV_from_2gp(DisasContext *s, arg_VMOV_to_2gp *a)
+{
+    /*
+     * VMOV two general-purpose registers to two 32-bit vector lanes.
+     * This insn is not predicated but it is subject to beat-wise
+     * execution if it is not in an IT block. For us this means
+     * only that if PSR.ECI says we should not be executing the beat
+     * corresponding to the lane of the vector register being accessed
+     * then we should skip perfoming the move, and that we need to do
+     * the usual check for bad ECI state and advance of ECI state.
+     * (If PSR.ECI is non-zero then we cannot be in an IT block.)
+     */
+    TCGv_i32 tmp;
+    int vd;
+
+    if (!dc_isar_feature(aa32_mve, s) || !mve_check_qreg_bank(s, a->qd) ||
+        a->rt == 13 || a->rt == 15 || a->rt2 == 13 || a->rt2 == 15) {
+        /* Rt/Rt2 cases are UNPREDICTABLE */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    /* Convert Qreg idx to Dreg for read_neon_element32() etc */
+    vd = a->qd * 2;
+
+    if (!mve_skip_vmov(s, vd, a->idx, MO_32)) {
+        tmp = load_reg(s, a->rt);
+        write_neon_element32(tmp, vd, a->idx, MO_32);
+        tcg_temp_free_i32(tmp);
+    }
+    if (!mve_skip_vmov(s, vd + 1, a->idx, MO_32)) {
+        tmp = load_reg(s, a->rt2);
+        write_neon_element32(tmp, vd + 1, a->idx, MO_32);
+        tcg_temp_free_i32(tmp);
+    }
+
+    mve_update_and_store_eci(s);
+    return true;
+}
diff --git a/target/arm/translate-vfp.c b/target/arm/translate-vfp.c
index b2991e21ec7..e2eb797c829 100644
--- a/target/arm/translate-vfp.c
+++ b/target/arm/translate-vfp.c
@@ -581,7 +581,7 @@ static bool trans_VCVT(DisasContext *s, arg_VCVT *a)
     return true;
 }
 
-static bool mve_skip_vmov(DisasContext *s, int vn, int index, int size)
+bool mve_skip_vmov(DisasContext *s, int vn, int index, int size)
 {
     /*
      * In a CPU with MVE, the VMOV (vector lane to general-purpose register)
-- 
2.20.1

[PATCH for-6.2 30/34] target/arm: Implement MVE VPNOT

[Peter Maydell]

Implement the MVE VPNOT insn, which inverts the bits in VPR.P0
(subject to both predication and to beatwise execution).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  1 +
 target/arm/mve.decode      |  1 +
 target/arm/mve_helper.c    | 17 +++++++++++++++++
 target/arm/translate-mve.c | 19 +++++++++++++++++++
 4 files changed, 38 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index c36640e75e9..5844bb891ed 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -123,6 +123,7 @@ DEF_HELPER_FLAGS_4(mve_vorn, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_veor, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 
 DEF_HELPER_FLAGS_4(mve_vpsel, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
+DEF_HELPER_FLAGS_1(mve_vpnot, TCG_CALL_NO_WG, void, env)
 
 DEF_HELPER_FLAGS_4(mve_vaddb, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vaddh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 6ac9cb8e4d4..82dc07bc30e 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -573,6 +573,7 @@ VCMPGT            1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 1 @vcmp
 VCMPLE            1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 1 @vcmp
 
 {
+  VPNOT           1111 1110 0 0 11 000 1 000 0 1111 0100 1101
   VPST            1111 1110 0 . 11 000 1 ... 0 1111 0100 1101 mask=%mask_22_13
   VCMPEQ_scalar   1111 1110 0 . .. ... 1 ... 0 1111 0 1 0 0 .... @vcmp_scalar
 }
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 40e652229d6..6efb3c69636 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -2214,6 +2214,23 @@ void HELPER(mve_vpsel)(CPUARMState *env, void *vd, void *vn, void *vm)
     mve_advance_vpt(env);
 }
 
+void HELPER(mve_vpnot)(CPUARMState *env)
+{
+    /*
+     * P0 bits for unexecuted beats (where eci_mask is 0) are unchanged.
+     * P0 bits for predicated lanes in executed bits (where mask is 0) are 0.
+     * P0 bits otherwise are inverted.
+     * (This is the same logic as VCMP.)
+     * This insn is itself subject to predication and to beat-wise execution,
+     * and after it executes VPT state advances in the usual way.
+     */
+    uint16_t mask = mve_element_mask(env);
+    uint16_t eci_mask = mve_eci_mask(env);
+    uint16_t beatpred = ~env->v7m.vpr & mask;
+    env->v7m.vpr = (env->v7m.vpr & ~(uint32_t)eci_mask) | (beatpred & eci_mask);
+    mve_advance_vpt(env);
+}
+
 #define DO_1OP_SAT(OP, ESIZE, TYPE, FN)                                 \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm)         \
     {                                                                   \
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 43f917e609e..be961864ada 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -889,6 +889,25 @@ static bool trans_VPST(DisasContext *s, arg_VPST *a)
     return true;
 }
 
+static bool trans_VPNOT(DisasContext *s, arg_VPNOT *a)
+{
+    /*
+     * Invert the predicate in VPR.P0. We have call out to
+     * a helper because this insn itself is beatwise and can
+     * be predicated.
+     */
+    if (!dc_isar_feature(aa32_mve, s)) {
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    gen_helper_mve_vpnot(cpu_env);
+    mve_update_eci(s);
+    return true;
+}
+
 static bool trans_VADDV(DisasContext *s, arg_VADDV *a)
 {
     /* VADDV: vector add across vector */
-- 
2.20.1

[PATCH for-6.2 31/34] target/arm: Implement MVE VCTP

[Peter Maydell]

Implement the MVE VCTP insn, which sets the VPR.P0 predicate bits so
as to predicate any element at index Rn or greater is predicated.  As
with VPNOT, this insn itself is predicable and subject to beatwise
execution.

The calculation of the mask is the same as is used to determine
ltpmask in mve_element_mask(), but we precalculate masklen in
generated code to avoid having to have 4 helpers specialized by size.

We put the decode line in with the low-overhead-loop insns in
t32.decode because it's logically part of that collection of insn
patterns, even though it is an MVE only insn.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  2 ++
 target/arm/translate-a32.h |  1 +
 target/arm/t32.decode      |  1 +
 target/arm/mve_helper.c    | 20 ++++++++++++++++++++
 target/arm/translate-mve.c |  2 +-
 target/arm/translate.c     | 33 +++++++++++++++++++++++++++++++++
 6 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 5844bb891ed..55f9151ccbf 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -125,6 +125,8 @@ DEF_HELPER_FLAGS_4(mve_veor, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vpsel, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_1(mve_vpnot, TCG_CALL_NO_WG, void, env)
 
+DEF_HELPER_FLAGS_2(mve_vctp, TCG_CALL_NO_WG, void, env, i32)
+
 DEF_HELPER_FLAGS_4(mve_vaddb, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vaddh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
 DEF_HELPER_FLAGS_4(mve_vaddw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
diff --git a/target/arm/translate-a32.h b/target/arm/translate-a32.h
index 6f4d65ddb00..88f15df60e8 100644
--- a/target/arm/translate-a32.h
+++ b/target/arm/translate-a32.h
@@ -48,6 +48,7 @@ long neon_element_offset(int reg, int element, MemOp memop);
 void gen_rev16(TCGv_i32 dest, TCGv_i32 var);
 void clear_eci_state(DisasContext *s);
 bool mve_eci_check(DisasContext *s);
+void mve_update_eci(DisasContext *s);
 void mve_update_and_store_eci(DisasContext *s);
 bool mve_skip_vmov(DisasContext *s, int vn, int index, int size);
 
diff --git a/target/arm/t32.decode b/target/arm/t32.decode
index 2d47f31f143..78fadef9d62 100644
--- a/target/arm/t32.decode
+++ b/target/arm/t32.decode
@@ -748,5 +748,6 @@ BL               1111 0. .......... 11.1 ............         @branch24
       # This is DLSTP
       DLS        1111 0 0000 0 size:2 rn:4 1110 0000 0000 0001
     }
+    VCTP         1111 0 0000 0 size:2 rn:4 1110 1000 0000 0001
   ]
 }
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 6efb3c69636..210e70d1727 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -2231,6 +2231,26 @@ void HELPER(mve_vpnot)(CPUARMState *env)
     mve_advance_vpt(env);
 }
 
+/*
+ * VCTP: P0 unexecuted bits unchanged, predicated bits zeroed,
+ * otherwise set according to value of Rn. The calculation of
+ * newmask here works in the same way as the calculation of the
+ * ltpmask in mve_element_mask(), but we have pre-calculated
+ * the masklen in the generated code.
+ */
+void HELPER(mve_vctp)(CPUARMState *env, uint32_t masklen)
+{
+    uint16_t mask = mve_element_mask(env);
+    uint16_t eci_mask = mve_eci_mask(env);
+    uint16_t newmask;
+
+    assert(masklen <= 16);
+    newmask = masklen ? MAKE_64BIT_MASK(0, masklen) : 0;
+    newmask &= mask;
+    env->v7m.vpr = (env->v7m.vpr & ~(uint32_t)eci_mask) | (newmask & eci_mask);
+    mve_advance_vpt(env);
+}
+
 #define DO_1OP_SAT(OP, ESIZE, TYPE, FN)                                 \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm)         \
     {                                                                   \
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index be961864ada..be5a3e1a1f5 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -93,7 +93,7 @@ bool mve_eci_check(DisasContext *s)
     }
 }
 
-static void mve_update_eci(DisasContext *s)
+void mve_update_eci(DisasContext *s)
 {
     /*
      * The helper function will always update the CPUState field,
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 28e478927df..e0b0cabc39f 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -8677,6 +8677,39 @@ static bool trans_LCTP(DisasContext *s, arg_LCTP *a)
     return true;
 }
 
+static bool trans_VCTP(DisasContext *s, arg_VCTP *a)
+{
+    /*
+     * M-profile Create Vector Tail Predicate. This insn is itself
+     * predicated and is subject to beatwise execution.
+     */
+    TCGv_i32 rn_shifted, masklen;
+
+    if (!dc_isar_feature(aa32_mve, s) || a->rn == 13 || a->rn == 15) {
+        return false;
+    }
+
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    /*
+     * We pre-calculate the mask length here to avoid having
+     * to have multiple helpers specialized for size.
+     * We pass the helper "rn <= (1 << (4 - size)) ? (rn << size) : 16".
+     */
+    rn_shifted = tcg_temp_new_i32();
+    masklen = load_reg(s, a->rn);
+    tcg_gen_shli_i32(rn_shifted, masklen, a->size);
+    tcg_gen_movcond_i32(TCG_COND_LEU, masklen,
+                        masklen, tcg_constant_i32(1 << (4 - a->size)),
+                        rn_shifted, tcg_constant_i32(16));
+    gen_helper_mve_vctp(cpu_env, masklen);
+    tcg_temp_free_i32(masklen);
+    tcg_temp_free_i32(rn_shifted);
+    mve_update_eci(s);
+    return true;
+}
 
 static bool op_tbranch(DisasContext *s, arg_tbranch *a, bool half)
 {
-- 
2.20.1

[PATCH for-6.2 32/34] target/arm: Implement MVE scatter-gather insns

[Peter Maydell]

Implement the MVE gather-loads and scatter-stores which
form the address by adding a base value from a scalar
register to an offset in each element of a vector.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  32 +++++++++
 target/arm/mve.decode      |  12 ++++
 target/arm/mve_helper.c    | 129 +++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c |  91 ++++++++++++++++++++++++++
 4 files changed, 264 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 55f9151ccbf..9c570270c61 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -33,6 +33,38 @@ DEF_HELPER_FLAGS_3(mve_vstrb_h, TCG_CALL_NO_WG, void, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vstrb_w, TCG_CALL_NO_WG, void, env, ptr, i32)
 DEF_HELPER_FLAGS_3(mve_vstrh_w, TCG_CALL_NO_WG, void, env, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vldrb_sg_sh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrb_sg_sw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrh_sg_sw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vldrb_sg_ub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrb_sg_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrb_sg_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrh_sg_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrh_sg_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrw_sg_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrd_sg_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vstrb_sg_ub, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrb_sg_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrb_sg_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrh_sg_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrh_sg_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrw_sg_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrd_sg_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vldrh_sg_os_sw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vldrh_sg_os_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrh_sg_os_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrw_sg_os_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrd_sg_os_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(mve_vstrh_sg_os_uh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrh_sg_os_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrw_sg_os_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrd_sg_os_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_3(mve_vdup, TCG_CALL_NO_WG, void, env, ptr, i32)
 
 DEF_HELPER_FLAGS_4(mve_vidupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 82dc07bc30e..b0e39f36723 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -42,11 +42,18 @@
 &shl_scalar qda rm size
 &vmaxv qm rda size
 &vabav qn qm rda size
+&vldst_sg qd qm rn size msize os
+
+# scatter-gather memory size is in bits 6:4
+%sg_msize 6:1 4:1
 
 @vldr_vstr ....... . . . . l:1 rn:4 ... ...... imm:7 &vldr_vstr qd=%qd u=0
 # Note that both Rn and Qd are 3 bits only (no D bit)
 @vldst_wn ... u:1 ... . . . . l:1 . rn:3 qd:3 . ... .. imm:7 &vldr_vstr
 
+@vldst_sg .... .... .... rn:4 .... ... size:2 ... ... os:1 &vldst_sg \
+          qd=%qd qm=%qm msize=%sg_msize
+
 @1op .... .... .... size:2 .. .... .... .... .... &1op qd=%qd qm=%qm
 @1op_nosz .... .... .... .... .... .... .... .... &1op qd=%qd qm=%qm size=0
 @2op .... .... .. size:2 .... .... .... .... .... &2op qd=%qd qm=%qm qn=%qn
@@ -136,6 +143,11 @@ VLDR_VSTR        1110110 1 a:1 . w:1 . .... ... 111101 .......   @vldr_vstr \
 VLDR_VSTR        1110110 1 a:1 . w:1 . .... ... 111110 .......   @vldr_vstr \
                  size=2 p=1
 
+# gather loads/scatter stores
+VLDR_S_sg        111 0 1100 1 . 01 .... ... 0 111 . .... .... @vldst_sg
+VLDR_U_sg        111 1 1100 1 . 01 .... ... 0 111 . .... .... @vldst_sg
+VSTR_sg          111 0 1100 1 . 00 .... ... 0 111 . .... .... @vldst_sg
+
 # Moves between 2 32-bit vector lanes and 2 general purpose registers
 VMOV_to_2gp      1110 1100 0 . 00 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
 VMOV_from_2gp    1110 1100 0 . 01 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 210e70d1727..36592b88372 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -213,6 +213,135 @@ DO_VSTR(vstrh_w, 2, stw, 4, int32_t)
 #undef DO_VLDR
 #undef DO_VSTR
 
+/*
+ * Gather loads/scatter stores. Here each element of Qm specifies
+ * an offset to use from the base register Rm. In the _os_ versions
+ * that offset is scaled by the element size.
+ * For loads, predicated lanes are zeroed instead of retaining
+ * their previous values.
+ */
+#define DO_VLDR_SG(OP, LDTYPE, ESIZE, TYPE, OFFTYPE, ADDRFN)            \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
+                          uint32_t base)                                \
+    {                                                                   \
+        TYPE *d = vd;                                                   \
+        OFFTYPE *m = vm;                                                \
+        uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
+        unsigned e;                                                     \
+        uint32_t addr;                                                  \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE, eci_mask >>= ESIZE) { \
+            if (!(eci_mask & 1)) {                                      \
+                continue;                                               \
+            }                                                           \
+            addr = ADDRFN(base, m[H##ESIZE(e)]);                        \
+            d[H##ESIZE(e)] = (mask & 1) ?                               \
+                cpu_##LDTYPE##_data_ra(env, addr, GETPC()) : 0;         \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+/* We know here TYPE is unsigned so always the same as the offset type */
+#define DO_VSTR_SG(OP, STTYPE, ESIZE, TYPE, ADDRFN)                     \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
+                          uint32_t base)                                \
+    {                                                                   \
+        TYPE *d = vd;                                                   \
+        TYPE *m = vm;                                                   \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        uint32_t addr;                                                  \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+            addr = ADDRFN(base, m[H##ESIZE(e)]);                        \
+            if (mask & 1) {                                             \
+                cpu_##STTYPE##_data_ra(env, addr, d[H##ESIZE(e)], GETPC()); \
+            }                                                           \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+/*
+ * 64-bit accesses are slightly different: they are done as two 32-bit
+ * accesses, controlled by the predicate mask for the relevant beat,
+ * and with a single 32-bit offset in the first of the two Qm elements.
+ * Note that for QEMU our IMPDEF AIRCR.ENDIANNESS is always 0 (little).
+ */
+#define DO_VLDR64_SG(OP, ADDRFN)                                        \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
+                          uint32_t base)                                \
+    {                                                                   \
+        uint32_t *d = vd;                                               \
+        uint32_t *m = vm;                                               \
+        uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
+        unsigned e;                                                     \
+        uint32_t addr;                                                  \
+        for (e = 0; e < 16 / 4; e++, mask >>= 4, eci_mask >>= 4) {      \
+            if (!(eci_mask & 1)) {                                      \
+                continue;                                               \
+            }                                                           \
+            addr = ADDRFN(base, m[H4(e & ~1)]);                         \
+            addr += 4 * (e & 1);                                        \
+            d[H4(e)] = (mask & 1) ? cpu_ldl_data_ra(env, addr, GETPC()) : 0; \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+#define DO_VSTR64_SG(OP, ADDRFN)                                        \
+    void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
+                          uint32_t base)                                \
+    {                                                                   \
+        uint32_t *d = vd;                                               \
+        uint32_t *m = vm;                                               \
+        uint16_t mask = mve_element_mask(env);                          \
+        unsigned e;                                                     \
+        uint32_t addr;                                                  \
+        for (e = 0; e < 16 / 4; e++, mask >>= 4) {                      \
+            addr = ADDRFN(base, m[H4(e & ~1)]);                         \
+            addr += 4 * (e & 1);                                        \
+            if (mask & 1) {                                             \
+                cpu_stl_data_ra(env, addr, d[H4(e)], GETPC());          \
+            }                                                           \
+        }                                                               \
+        mve_advance_vpt(env);                                           \
+    }
+
+#define ADDR_ADD(BASE, OFFSET) ((BASE) + (OFFSET))
+#define ADDR_ADD_OSH(BASE, OFFSET) ((BASE) + ((OFFSET) << 1))
+#define ADDR_ADD_OSW(BASE, OFFSET) ((BASE) + ((OFFSET) << 2))
+#define ADDR_ADD_OSD(BASE, OFFSET) ((BASE) + ((OFFSET) << 3))
+
+DO_VLDR_SG(vldrb_sg_sh, ldsb, 2, int16_t, uint16_t, ADDR_ADD)
+DO_VLDR_SG(vldrb_sg_sw, ldsb, 4, int32_t, uint32_t, ADDR_ADD)
+DO_VLDR_SG(vldrh_sg_sw, ldsw, 4, int32_t, uint32_t, ADDR_ADD)
+
+DO_VLDR_SG(vldrb_sg_ub, ldub, 1, uint8_t, uint8_t, ADDR_ADD)
+DO_VLDR_SG(vldrb_sg_uh, ldub, 2, uint16_t, uint16_t, ADDR_ADD)
+DO_VLDR_SG(vldrb_sg_uw, ldub, 4, uint32_t, uint32_t, ADDR_ADD)
+DO_VLDR_SG(vldrh_sg_uh, lduw, 2, uint16_t, uint16_t, ADDR_ADD)
+DO_VLDR_SG(vldrh_sg_uw, lduw, 4, uint32_t, uint32_t, ADDR_ADD)
+DO_VLDR_SG(vldrw_sg_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD)
+DO_VLDR64_SG(vldrd_sg_ud, ADDR_ADD)
+
+DO_VLDR_SG(vldrh_sg_os_sw, ldsw, 4, int32_t, uint32_t, ADDR_ADD_OSH)
+DO_VLDR_SG(vldrh_sg_os_uh, lduw, 2, uint16_t, uint16_t, ADDR_ADD_OSH)
+DO_VLDR_SG(vldrh_sg_os_uw, lduw, 4, uint32_t, uint32_t, ADDR_ADD_OSH)
+DO_VLDR_SG(vldrw_sg_os_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD_OSW)
+DO_VLDR64_SG(vldrd_sg_os_ud, ADDR_ADD_OSD)
+
+DO_VSTR_SG(vstrb_sg_ub, stb, 1, uint8_t, ADDR_ADD)
+DO_VSTR_SG(vstrb_sg_uh, stb, 2, uint16_t, ADDR_ADD)
+DO_VSTR_SG(vstrb_sg_uw, stb, 4, uint32_t, ADDR_ADD)
+DO_VSTR_SG(vstrh_sg_uh, stw, 2, uint16_t, ADDR_ADD)
+DO_VSTR_SG(vstrh_sg_uw, stw, 4, uint32_t, ADDR_ADD)
+DO_VSTR_SG(vstrw_sg_uw, stl, 4, uint32_t, ADDR_ADD)
+DO_VSTR64_SG(vstrd_sg_ud, ADDR_ADD)
+
+DO_VSTR_SG(vstrh_sg_os_uh, stw, 2, uint16_t, ADDR_ADD_OSH)
+DO_VSTR_SG(vstrh_sg_os_uw, stw, 4, uint32_t, ADDR_ADD_OSH)
+DO_VSTR_SG(vstrw_sg_os_uw, stl, 4, uint32_t, ADDR_ADD_OSW)
+DO_VSTR64_SG(vstrd_sg_os_ud, ADDR_ADD_OSD)
+
 /*
  * The mergemask(D, R, M) macro performs the operation "*D = R" but
  * storing only the bytes which correspond to 1 bits in M,
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index be5a3e1a1f5..b0e4bdeb1c5 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -34,6 +34,7 @@ static inline int vidup_imm(DisasContext *s, int x)
 #include "decode-mve.c.inc"
 
 typedef void MVEGenLdStFn(TCGv_ptr, TCGv_ptr, TCGv_i32);
+typedef void MVEGenLdStSGFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenOneOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenTwoOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenTwoOpScalarFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
@@ -209,6 +210,96 @@ DO_VLDST_WIDE_NARROW(VLDSTB_H, vldrb_sh, vldrb_uh, vstrb_h, MO_8)
 DO_VLDST_WIDE_NARROW(VLDSTB_W, vldrb_sw, vldrb_uw, vstrb_w, MO_8)
 DO_VLDST_WIDE_NARROW(VLDSTH_W, vldrh_sw, vldrh_uw, vstrh_w, MO_16)
 
+static bool do_ldst_sg(DisasContext *s, arg_vldst_sg *a, MVEGenLdStSGFn fn)
+{
+    TCGv_i32 addr;
+    TCGv_ptr qd, qm;
+
+    if (!dc_isar_feature(aa32_mve, s) ||
+        !mve_check_qreg_bank(s, a->qd | a->qm) ||
+        !fn || a->rn == 15) {
+        /* Rn case is UNPREDICTABLE */
+        return false;
+    }
+
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    addr = load_reg(s, a->rn);
+
+    qd = mve_qreg_ptr(a->qd);
+    qm = mve_qreg_ptr(a->qm);
+    fn(cpu_env, qd, qm, addr);
+    tcg_temp_free_ptr(qd);
+    tcg_temp_free_ptr(qm);
+    tcg_temp_free_i32(addr);
+    mve_update_eci(s);
+    return true;
+}
+
+/*
+ * The naming scheme here is "vldrb_sg_sh == in-memory byte loads
+ * signextended to halfword elements in register". _os_ indicates that
+ * the offsets in Qm should be scaled by the element size.
+ */
+/* This macro is just to make the arrays more compact in these functions */
+#define F(N) gen_helper_mve_##N
+
+/* VLDRB/VSTRB (ie msize 1) with OS=1 is UNPREDICTABLE; we UNDEF */
+static bool trans_VLDR_S_sg(DisasContext *s, arg_vldst_sg *a)
+{
+    static MVEGenLdStSGFn * const fns[2][4][4] = { {
+            { NULL, F(vldrb_sg_sh), F(vldrb_sg_sw), NULL },
+            { NULL, NULL,           F(vldrh_sg_sw), NULL },
+            { NULL, NULL,           NULL,           NULL },
+            { NULL, NULL,           NULL,           NULL }
+        }, {
+            { NULL, NULL,              NULL,              NULL },
+            { NULL, NULL,              F(vldrh_sg_os_sw), NULL },
+            { NULL, NULL,              NULL,              NULL },
+            { NULL, NULL,              NULL,              NULL }
+        }
+    };
+    return do_ldst_sg(s, a, fns[a->os][a->msize][a->size]);
+}
+
+static bool trans_VLDR_U_sg(DisasContext *s, arg_vldst_sg *a)
+{
+    static MVEGenLdStSGFn * const fns[2][4][4] = { {
+            { F(vldrb_sg_ub), F(vldrb_sg_uh), F(vldrb_sg_uw), NULL },
+            { NULL,           F(vldrh_sg_uh), F(vldrh_sg_uw), NULL },
+            { NULL,           NULL,           F(vldrw_sg_uw), NULL },
+            { NULL,           NULL,           NULL,           F(vldrd_sg_ud) }
+        }, {
+            { NULL, NULL,              NULL,              NULL },
+            { NULL, F(vldrh_sg_os_uh), F(vldrh_sg_os_uw), NULL },
+            { NULL, NULL,              F(vldrw_sg_os_uw), NULL },
+            { NULL, NULL,              NULL,              F(vldrd_sg_os_ud) }
+        }
+    };
+    return do_ldst_sg(s, a, fns[a->os][a->msize][a->size]);
+}
+
+static bool trans_VSTR_sg(DisasContext *s, arg_vldst_sg *a)
+{
+    static MVEGenLdStSGFn * const fns[2][4][4] = { {
+            { F(vstrb_sg_ub), F(vstrb_sg_uh), F(vstrb_sg_uw), NULL },
+            { NULL,           F(vstrh_sg_uh), F(vstrh_sg_uw), NULL },
+            { NULL,           NULL,           F(vstrw_sg_uw), NULL },
+            { NULL,           NULL,           NULL,           F(vstrd_sg_ud) }
+        }, {
+            { NULL, NULL,              NULL,              NULL },
+            { NULL, F(vstrh_sg_os_uh), F(vstrh_sg_os_uw), NULL },
+            { NULL, NULL,              F(vstrw_sg_os_uw), NULL },
+            { NULL, NULL,              NULL,              F(vstrd_sg_os_ud) }
+        }
+    };
+    return do_ldst_sg(s, a, fns[a->os][a->msize][a->size]);
+}
+
+#undef F
+
 static bool trans_VDUP(DisasContext *s, arg_VDUP *a)
 {
     TCGv_ptr qd;
-- 
2.20.1

[PATCH for-6.2 33/34] target/arm: Implement MVE scatter-gather immediate forms

[Peter Maydell]

Implement the MVE VLDR/VSTR insns which do scatter-gather using base
addresses from Qm plus or minus an immediate offset (possibly with
writeback). Note that writeback is not predicated but it does have
to honour ECI state, so we have to add an eci_mask check to the
VSTR_SG macros (the VLDR_SG macros already needed this to be able
to distinguish "skip beat" from "set predicated element to 0").

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  5 +++
 target/arm/mve.decode      | 10 +++++
 target/arm/mve_helper.c    | 91 ++++++++++++++++++++++++--------------
 target/arm/translate-mve.c | 66 +++++++++++++++++++++++++++
 4 files changed, 140 insertions(+), 32 deletions(-)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 9c570270c61..16799b110fd 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -65,6 +65,11 @@ DEF_HELPER_FLAGS_4(mve_vstrh_sg_os_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vstrw_sg_os_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vstrd_sg_os_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 
+DEF_HELPER_FLAGS_4(mve_vldrw_sg_wb_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vldrd_sg_wb_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrw_sg_wb_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(mve_vstrd_sg_wb_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
+
 DEF_HELPER_FLAGS_3(mve_vdup, TCG_CALL_NO_WG, void, env, ptr, i32)
 
 DEF_HELPER_FLAGS_4(mve_vidupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index b0e39f36723..76e9b9c721c 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -43,6 +43,7 @@
 &vmaxv qm rda size
 &vabav qn qm rda size
 &vldst_sg qd qm rn size msize os
+&vldst_sg_imm qd qm a w imm
 
 # scatter-gather memory size is in bits 6:4
 %sg_msize 6:1 4:1
@@ -54,6 +55,10 @@
 @vldst_sg .... .... .... rn:4 .... ... size:2 ... ... os:1 &vldst_sg \
           qd=%qd qm=%qm msize=%sg_msize
 
+# Qm is in the fields usually labeled Qn
+@vldst_sg_imm .... .... a:1 . w:1 . .... .... .... . imm:7 &vldst_sg_imm \
+              qd=%qd qm=%qn
+
 @1op .... .... .... size:2 .. .... .... .... .... &1op qd=%qd qm=%qm
 @1op_nosz .... .... .... .... .... .... .... .... &1op qd=%qd qm=%qm size=0
 @2op .... .... .. size:2 .... .... .... .... .... &2op qd=%qd qm=%qm qn=%qn
@@ -148,6 +153,11 @@ VLDR_S_sg        111 0 1100 1 . 01 .... ... 0 111 . .... .... @vldst_sg
 VLDR_U_sg        111 1 1100 1 . 01 .... ... 0 111 . .... .... @vldst_sg
 VSTR_sg          111 0 1100 1 . 00 .... ... 0 111 . .... .... @vldst_sg
 
+VLDRW_sg_imm     111 1 1101 ... 1 ... 0 ... 1 1110 .... .... @vldst_sg_imm
+VLDRD_sg_imm     111 1 1101 ... 1 ... 0 ... 1 1111 .... .... @vldst_sg_imm
+VSTRW_sg_imm     111 1 1101 ... 0 ... 0 ... 1 1110 .... .... @vldst_sg_imm
+VSTRD_sg_imm     111 1 1101 ... 0 ... 0 ... 1 1111 .... .... @vldst_sg_imm
+
 # Moves between 2 32-bit vector lanes and 2 general purpose registers
 VMOV_to_2gp      1110 1100 0 . 00 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
 VMOV_from_2gp    1110 1100 0 . 01 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 36592b88372..293c0e11819 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -220,7 +220,7 @@ DO_VSTR(vstrh_w, 2, stw, 4, int32_t)
  * For loads, predicated lanes are zeroed instead of retaining
  * their previous values.
  */
-#define DO_VLDR_SG(OP, LDTYPE, ESIZE, TYPE, OFFTYPE, ADDRFN)            \
+#define DO_VLDR_SG(OP, LDTYPE, ESIZE, TYPE, OFFTYPE, ADDRFN, WB)        \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
                           uint32_t base)                                \
     {                                                                   \
@@ -237,25 +237,35 @@ DO_VSTR(vstrh_w, 2, stw, 4, int32_t)
             addr = ADDRFN(base, m[H##ESIZE(e)]);                        \
             d[H##ESIZE(e)] = (mask & 1) ?                               \
                 cpu_##LDTYPE##_data_ra(env, addr, GETPC()) : 0;         \
+            if (WB) {                                                   \
+                m[H##ESIZE(e)] = addr;                                  \
+            }                                                           \
         }                                                               \
         mve_advance_vpt(env);                                           \
     }
 
 /* We know here TYPE is unsigned so always the same as the offset type */
-#define DO_VSTR_SG(OP, STTYPE, ESIZE, TYPE, ADDRFN)                     \
+#define DO_VSTR_SG(OP, STTYPE, ESIZE, TYPE, ADDRFN, WB)                 \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
                           uint32_t base)                                \
     {                                                                   \
         TYPE *d = vd;                                                   \
         TYPE *m = vm;                                                   \
         uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
         unsigned e;                                                     \
         uint32_t addr;                                                  \
-        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {              \
+        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE, eci_mask >>= ESIZE) { \
+            if (!(eci_mask & 1)) {                                      \
+                continue;                                               \
+            }                                                           \
             addr = ADDRFN(base, m[H##ESIZE(e)]);                        \
             if (mask & 1) {                                             \
                 cpu_##STTYPE##_data_ra(env, addr, d[H##ESIZE(e)], GETPC()); \
             }                                                           \
+            if (WB) {                                                   \
+                m[H##ESIZE(e)] = addr;                                  \
+            }                                                           \
         }                                                               \
         mve_advance_vpt(env);                                           \
     }
@@ -265,8 +275,10 @@ DO_VSTR(vstrh_w, 2, stw, 4, int32_t)
  * accesses, controlled by the predicate mask for the relevant beat,
  * and with a single 32-bit offset in the first of the two Qm elements.
  * Note that for QEMU our IMPDEF AIRCR.ENDIANNESS is always 0 (little).
+ * Address writeback happens on the odd beats and updates the address
+ * stored in the even-beat element.
  */
-#define DO_VLDR64_SG(OP, ADDRFN)                                        \
+#define DO_VLDR64_SG(OP, ADDRFN, WB)                                    \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
                           uint32_t base)                                \
     {                                                                   \
@@ -283,25 +295,35 @@ DO_VSTR(vstrh_w, 2, stw, 4, int32_t)
             addr = ADDRFN(base, m[H4(e & ~1)]);                         \
             addr += 4 * (e & 1);                                        \
             d[H4(e)] = (mask & 1) ? cpu_ldl_data_ra(env, addr, GETPC()) : 0; \
+            if (WB && (e & 1)) {                                        \
+                m[H4(e & ~1)] = addr - 4;                               \
+            }                                                           \
         }                                                               \
         mve_advance_vpt(env);                                           \
     }
 
-#define DO_VSTR64_SG(OP, ADDRFN)                                        \
+#define DO_VSTR64_SG(OP, ADDRFN, WB)                                    \
     void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm,         \
                           uint32_t base)                                \
     {                                                                   \
         uint32_t *d = vd;                                               \
         uint32_t *m = vm;                                               \
         uint16_t mask = mve_element_mask(env);                          \
+        uint16_t eci_mask = mve_eci_mask(env);                          \
         unsigned e;                                                     \
         uint32_t addr;                                                  \
-        for (e = 0; e < 16 / 4; e++, mask >>= 4) {                      \
+        for (e = 0; e < 16 / 4; e++, mask >>= 4, eci_mask >>= 4) {      \
+            if (!(eci_mask & 1)) {                                      \
+                continue;                                               \
+            }                                                           \
             addr = ADDRFN(base, m[H4(e & ~1)]);                         \
             addr += 4 * (e & 1);                                        \
             if (mask & 1) {                                             \
                 cpu_stl_data_ra(env, addr, d[H4(e)], GETPC());          \
             }                                                           \
+            if (WB && (e & 1)) {                                        \
+                m[H4(e & ~1)] = addr - 4;                               \
+            }                                                           \
         }                                                               \
         mve_advance_vpt(env);                                           \
     }
@@ -311,36 +333,41 @@ DO_VSTR(vstrh_w, 2, stw, 4, int32_t)
 #define ADDR_ADD_OSW(BASE, OFFSET) ((BASE) + ((OFFSET) << 2))
 #define ADDR_ADD_OSD(BASE, OFFSET) ((BASE) + ((OFFSET) << 3))
 
-DO_VLDR_SG(vldrb_sg_sh, ldsb, 2, int16_t, uint16_t, ADDR_ADD)
-DO_VLDR_SG(vldrb_sg_sw, ldsb, 4, int32_t, uint32_t, ADDR_ADD)
-DO_VLDR_SG(vldrh_sg_sw, ldsw, 4, int32_t, uint32_t, ADDR_ADD)
+DO_VLDR_SG(vldrb_sg_sh, ldsb, 2, int16_t, uint16_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrb_sg_sw, ldsb, 4, int32_t, uint32_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrh_sg_sw, ldsw, 4, int32_t, uint32_t, ADDR_ADD, false)
 
-DO_VLDR_SG(vldrb_sg_ub, ldub, 1, uint8_t, uint8_t, ADDR_ADD)
-DO_VLDR_SG(vldrb_sg_uh, ldub, 2, uint16_t, uint16_t, ADDR_ADD)
-DO_VLDR_SG(vldrb_sg_uw, ldub, 4, uint32_t, uint32_t, ADDR_ADD)
-DO_VLDR_SG(vldrh_sg_uh, lduw, 2, uint16_t, uint16_t, ADDR_ADD)
-DO_VLDR_SG(vldrh_sg_uw, lduw, 4, uint32_t, uint32_t, ADDR_ADD)
-DO_VLDR_SG(vldrw_sg_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD)
-DO_VLDR64_SG(vldrd_sg_ud, ADDR_ADD)
+DO_VLDR_SG(vldrb_sg_ub, ldub, 1, uint8_t, uint8_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrb_sg_uh, ldub, 2, uint16_t, uint16_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrb_sg_uw, ldub, 4, uint32_t, uint32_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrh_sg_uh, lduw, 2, uint16_t, uint16_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrh_sg_uw, lduw, 4, uint32_t, uint32_t, ADDR_ADD, false)
+DO_VLDR_SG(vldrw_sg_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD, false)
+DO_VLDR64_SG(vldrd_sg_ud, ADDR_ADD, false)
 
-DO_VLDR_SG(vldrh_sg_os_sw, ldsw, 4, int32_t, uint32_t, ADDR_ADD_OSH)
-DO_VLDR_SG(vldrh_sg_os_uh, lduw, 2, uint16_t, uint16_t, ADDR_ADD_OSH)
-DO_VLDR_SG(vldrh_sg_os_uw, lduw, 4, uint32_t, uint32_t, ADDR_ADD_OSH)
-DO_VLDR_SG(vldrw_sg_os_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD_OSW)
-DO_VLDR64_SG(vldrd_sg_os_ud, ADDR_ADD_OSD)
+DO_VLDR_SG(vldrh_sg_os_sw, ldsw, 4, int32_t, uint32_t, ADDR_ADD_OSH, false)
+DO_VLDR_SG(vldrh_sg_os_uh, lduw, 2, uint16_t, uint16_t, ADDR_ADD_OSH, false)
+DO_VLDR_SG(vldrh_sg_os_uw, lduw, 4, uint32_t, uint32_t, ADDR_ADD_OSH, false)
+DO_VLDR_SG(vldrw_sg_os_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD_OSW, false)
+DO_VLDR64_SG(vldrd_sg_os_ud, ADDR_ADD_OSD, false)
 
-DO_VSTR_SG(vstrb_sg_ub, stb, 1, uint8_t, ADDR_ADD)
-DO_VSTR_SG(vstrb_sg_uh, stb, 2, uint16_t, ADDR_ADD)
-DO_VSTR_SG(vstrb_sg_uw, stb, 4, uint32_t, ADDR_ADD)
-DO_VSTR_SG(vstrh_sg_uh, stw, 2, uint16_t, ADDR_ADD)
-DO_VSTR_SG(vstrh_sg_uw, stw, 4, uint32_t, ADDR_ADD)
-DO_VSTR_SG(vstrw_sg_uw, stl, 4, uint32_t, ADDR_ADD)
-DO_VSTR64_SG(vstrd_sg_ud, ADDR_ADD)
+DO_VSTR_SG(vstrb_sg_ub, stb, 1, uint8_t, ADDR_ADD, false)
+DO_VSTR_SG(vstrb_sg_uh, stb, 2, uint16_t, ADDR_ADD, false)
+DO_VSTR_SG(vstrb_sg_uw, stb, 4, uint32_t, ADDR_ADD, false)
+DO_VSTR_SG(vstrh_sg_uh, stw, 2, uint16_t, ADDR_ADD, false)
+DO_VSTR_SG(vstrh_sg_uw, stw, 4, uint32_t, ADDR_ADD, false)
+DO_VSTR_SG(vstrw_sg_uw, stl, 4, uint32_t, ADDR_ADD, false)
+DO_VSTR64_SG(vstrd_sg_ud, ADDR_ADD, false)
 
-DO_VSTR_SG(vstrh_sg_os_uh, stw, 2, uint16_t, ADDR_ADD_OSH)
-DO_VSTR_SG(vstrh_sg_os_uw, stw, 4, uint32_t, ADDR_ADD_OSH)
-DO_VSTR_SG(vstrw_sg_os_uw, stl, 4, uint32_t, ADDR_ADD_OSW)
-DO_VSTR64_SG(vstrd_sg_os_ud, ADDR_ADD_OSD)
+DO_VSTR_SG(vstrh_sg_os_uh, stw, 2, uint16_t, ADDR_ADD_OSH, false)
+DO_VSTR_SG(vstrh_sg_os_uw, stw, 4, uint32_t, ADDR_ADD_OSH, false)
+DO_VSTR_SG(vstrw_sg_os_uw, stl, 4, uint32_t, ADDR_ADD_OSW, false)
+DO_VSTR64_SG(vstrd_sg_os_ud, ADDR_ADD_OSD, false)
+
+DO_VLDR_SG(vldrw_sg_wb_uw, ldl, 4, uint32_t, uint32_t, ADDR_ADD, true)
+DO_VLDR64_SG(vldrd_sg_wb_ud, ADDR_ADD, true)
+DO_VSTR_SG(vstrw_sg_wb_uw, stl, 4, uint32_t, ADDR_ADD, true)
+DO_VSTR64_SG(vstrd_sg_wb_ud, ADDR_ADD, true)
 
 /*
  * The mergemask(D, R, M) macro performs the operation "*D = R" but
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index b0e4bdeb1c5..f4229e308ba 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -300,6 +300,72 @@ static bool trans_VSTR_sg(DisasContext *s, arg_vldst_sg *a)
 
 #undef F
 
+static bool do_ldst_sg_imm(DisasContext *s, arg_vldst_sg_imm *a,
+                           MVEGenLdStSGFn *fn, unsigned msize)
+{
+    uint32_t offset;
+    TCGv_ptr qd, qm;
+
+    if (!dc_isar_feature(aa32_mve, s) ||
+        !mve_check_qreg_bank(s, a->qd | a->qm) ||
+        !fn) {
+        return false;
+    }
+
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    offset = a->imm << msize;
+    if (!a->a) {
+        offset = -offset;
+    }
+
+    qd = mve_qreg_ptr(a->qd);
+    qm = mve_qreg_ptr(a->qm);
+    fn(cpu_env, qd, qm, tcg_constant_i32(offset));
+    tcg_temp_free_ptr(qd);
+    tcg_temp_free_ptr(qm);
+    mve_update_eci(s);
+    return true;
+}
+
+static bool trans_VLDRW_sg_imm(DisasContext *s, arg_vldst_sg_imm *a)
+{
+    static MVEGenLdStSGFn * const fns[] = {
+        gen_helper_mve_vldrw_sg_uw,
+        gen_helper_mve_vldrw_sg_wb_uw,
+    };
+    return do_ldst_sg_imm(s, a, fns[a->w], MO_32);
+}
+
+static bool trans_VLDRD_sg_imm(DisasContext *s, arg_vldst_sg_imm *a)
+{
+    static MVEGenLdStSGFn * const fns[] = {
+        gen_helper_mve_vldrd_sg_ud,
+        gen_helper_mve_vldrd_sg_wb_ud,
+    };
+    return do_ldst_sg_imm(s, a, fns[a->w], MO_64);
+}
+
+static bool trans_VSTRW_sg_imm(DisasContext *s, arg_vldst_sg_imm *a)
+{
+    static MVEGenLdStSGFn * const fns[] = {
+        gen_helper_mve_vstrw_sg_uw,
+        gen_helper_mve_vstrw_sg_wb_uw,
+    };
+    return do_ldst_sg_imm(s, a, fns[a->w], MO_32);
+}
+
+static bool trans_VSTRD_sg_imm(DisasContext *s, arg_vldst_sg_imm *a)
+{
+    static MVEGenLdStSGFn * const fns[] = {
+        gen_helper_mve_vstrd_sg_ud,
+        gen_helper_mve_vstrd_sg_wb_ud,
+    };
+    return do_ldst_sg_imm(s, a, fns[a->w], MO_64);
+}
+
 static bool trans_VDUP(DisasContext *s, arg_VDUP *a)
 {
     TCGv_ptr qd;
-- 
2.20.1

[PATCH for-6.2 34/34] target/arm: Implement MVE interleaving loads/stores

[Peter Maydell]

Implement the MVE interleaving load/store functions VLD2, VLD4, VST2
and VST4.  VLD2 loads 16 bytes of data from memory and writes to 2
consecutive Qregs; VLD4 loads 16 bytes of data from memory and writes
to 4 consecutive Qregs.  The 'pattern' field in the encoding
determines the offset into memory which is accessed and also which
elements in the Qregs are written to.  (The intention is that a
sequence of four consecutive VLD4 with different pattern values
performs a complete de-interleaving load of 64 bytes into all
elements of the 4 Qregs.) VST2 and VST4 do the same, but for stores.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
I found the pseudocode description of these instructions pretty
hard to follow, because (1) it is written to be generic over all
sizes and pattern values and beat counts and (2) it accesses
the vector elements by (Qreg number, beat within Qreg, element
within beat). I ended up writing a little program to print out the
various intermediate numbers and also calculate "index of element
within the whole Qreg", which is what QEMU wants to access
elements by. You can find that here:
  https://people.linaro.org/~peter.maydell/ldinter.c
I then just stared at the numbers for each (pattern, esize)
specialization and tried to come up with something that does
less gluing together of random bits from curBeat, pattern and
e than the pseudocode...
---
 target/arm/helper-mve.h    |  48 ++++++
 target/arm/mve.decode      |  11 ++
 target/arm/mve_helper.c    | 342 +++++++++++++++++++++++++++++++++++++
 target/arm/translate-mve.c |  94 ++++++++++
 4 files changed, 495 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 16799b110fd..9d1453ca174 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -70,6 +70,54 @@ DEF_HELPER_FLAGS_4(mve_vldrd_sg_wb_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vstrw_sg_wb_uw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(mve_vstrd_sg_wb_ud, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
 
+DEF_HELPER_FLAGS_3(mve_vld20b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld20h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld20w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vld21b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld21h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld21w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vld40b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld40h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld40w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vld41b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld41h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld41w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vld42b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld42h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld42w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vld43b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld43h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vld43w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vst20b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst20h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst20w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vst21b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst21h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst21w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vst40b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst40h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst40w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vst41b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst41h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst41w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vst42b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst42h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst42w, TCG_CALL_NO_WG, void, env, i32, i32)
+
+DEF_HELPER_FLAGS_3(mve_vst43b, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst43h, TCG_CALL_NO_WG, void, env, i32, i32)
+DEF_HELPER_FLAGS_3(mve_vst43w, TCG_CALL_NO_WG, void, env, i32, i32)
+
 DEF_HELPER_FLAGS_3(mve_vdup, TCG_CALL_NO_WG, void, env, ptr, i32)
 
 DEF_HELPER_FLAGS_4(mve_vidupb, TCG_CALL_NO_WG, i32, env, ptr, i32, i32)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 76e9b9c721c..faff94cf6d5 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -44,6 +44,7 @@
 &vabav qn qm rda size
 &vldst_sg qd qm rn size msize os
 &vldst_sg_imm qd qm a w imm
+&vldst_il qd rn size pat w
 
 # scatter-gather memory size is in bits 6:4
 %sg_msize 6:1 4:1
@@ -59,6 +60,10 @@
 @vldst_sg_imm .... .... a:1 . w:1 . .... .... .... . imm:7 &vldst_sg_imm \
               qd=%qd qm=%qn
 
+# Deinterleaving load/interleaving store
+@vldst_il .... .... .. w:1 . rn:4 .... ... size:2 pat:2 ..... &vldst_il \
+          qd=%qd
+
 @1op .... .... .... size:2 .. .... .... .... .... &1op qd=%qd qm=%qm
 @1op_nosz .... .... .... .... .... .... .... .... &1op qd=%qd qm=%qm size=0
 @2op .... .... .. size:2 .... .... .... .... .... &2op qd=%qd qm=%qm qn=%qn
@@ -158,6 +163,12 @@ VLDRD_sg_imm     111 1 1101 ... 1 ... 0 ... 1 1111 .... .... @vldst_sg_imm
 VSTRW_sg_imm     111 1 1101 ... 0 ... 0 ... 1 1110 .... .... @vldst_sg_imm
 VSTRD_sg_imm     111 1 1101 ... 0 ... 0 ... 1 1111 .... .... @vldst_sg_imm
 
+# deinterleaving loads/interleaving stores
+VLD2             1111 1100 1 .. 1 .... ... 1 111 .. .. 00000 @vldst_il
+VLD4             1111 1100 1 .. 1 .... ... 1 111 .. .. 00001 @vldst_il
+VST2             1111 1100 1 .. 0 .... ... 1 111 .. .. 00000 @vldst_il
+VST4             1111 1100 1 .. 0 .... ... 1 111 .. .. 00001 @vldst_il
+
 # Moves between 2 32-bit vector lanes and 2 general purpose registers
 VMOV_to_2gp      1110 1100 0 . 00 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
 VMOV_from_2gp    1110 1100 0 . 01 rt2:4 ... 0 1111 000 idx:1 rt:4 qd=%qd
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 293c0e11819..ec9677395fc 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -369,6 +369,348 @@ DO_VLDR64_SG(vldrd_sg_wb_ud, ADDR_ADD, true)
 DO_VSTR_SG(vstrw_sg_wb_uw, stl, 4, uint32_t, ADDR_ADD, true)
 DO_VSTR64_SG(vstrd_sg_wb_ud, ADDR_ADD, true)
 
+/*
+ * Deinterleaving loads/interleaving stores.
+ *
+ * For these helpers we are passed the index of the first Qreg
+ * (VLD2/VST2 will also access Qn+1, VLD4/VST4 access Qn .. Qn+3)
+ * and the value of the base address register Rn.
+ * The helpers are specialized for pattern and element size, so
+ * for instance vld42h is VLD4 with pattern 2, element size MO_16.
+ *
+ * These insns are beatwise but not predicated, so we must honour ECI,
+ * but need not look at mve_element_mask().
+ *
+ * The pseudocode implements these insns with multiple memory accesses
+ * of the element size, but rules R_VVVG and R_FXDM permit us to make
+ * one 32-bit memory access per beat.
+ */
+#define DO_VLD4B(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat, e;                                                    \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 4;                                \
+            data = cpu_ldl_le_data_ra(env, addr, GETPC());              \
+            for (e = 0; e < 4; e++, data >>= 8) {                       \
+                uint8_t *qd = (uint8_t *)aa32_vfp_qreg(env, qnidx + e); \
+                qd[H1(off[beat])] = data;                               \
+            }                                                           \
+        }                                                               \
+    }
+
+#define DO_VLD4H(OP, O1, O2)                                            \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O1, O2, O2 };                          \
+        uint32_t addr, data;                                            \
+        int y; /* y counts 0 2 0 2 */                                   \
+        uint16_t *qd;                                                   \
+        for (beat = 0, y = 0; beat < 4; beat++, mask >>= 4, y ^= 2) {   \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 8 + (beat & 1) * 4;               \
+            data = cpu_ldl_le_data_ra(env, addr, GETPC());              \
+            qd = (uint16_t *)aa32_vfp_qreg(env, qnidx + y);             \
+            qd[H2(off[beat])] = data;                                   \
+            data >>= 16;                                                \
+            qd = (uint16_t *)aa32_vfp_qreg(env, qnidx + y + 1);         \
+            qd[H2(off[beat])] = data;                                   \
+        }                                                               \
+    }
+
+#define DO_VLD4W(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        uint32_t *qd;                                                   \
+        int y;                                                          \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 4;                                \
+            data = cpu_ldl_le_data_ra(env, addr, GETPC());              \
+            y = (beat + (O1 & 2)) & 3;                                  \
+            qd = (uint32_t *)aa32_vfp_qreg(env, qnidx + y);             \
+            qd[H4(off[beat] >> 2)] = data;                              \
+        }                                                               \
+    }
+
+DO_VLD4B(vld40b, 0, 1, 10, 11)
+DO_VLD4B(vld41b, 2, 3, 12, 13)
+DO_VLD4B(vld42b, 4, 5, 14, 15)
+DO_VLD4B(vld43b, 6, 7, 8, 9)
+
+DO_VLD4H(vld40h, 0, 5)
+DO_VLD4H(vld41h, 1, 6)
+DO_VLD4H(vld42h, 2, 7)
+DO_VLD4H(vld43h, 3, 4)
+
+DO_VLD4W(vld40w, 0, 1, 10, 11)
+DO_VLD4W(vld41w, 2, 3, 12, 13)
+DO_VLD4W(vld42w, 4, 5, 14, 15)
+DO_VLD4W(vld43w, 6, 7, 8, 9)
+
+#define DO_VLD2B(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat, e;                                                    \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        uint8_t *qd;                                                    \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 2;                                \
+            data = cpu_ldl_le_data_ra(env, addr, GETPC());              \
+            for (e = 0; e < 4; e++, data >>= 8) {                       \
+                qd = (uint8_t *)aa32_vfp_qreg(env, qnidx + (e & 1));    \
+                qd[H1(off[beat] + (e >> 1))] = data;                    \
+            }                                                           \
+        }                                                               \
+    }
+
+#define DO_VLD2H(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        int e;                                                          \
+        uint16_t *qd;                                                   \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 4;                                \
+            data = cpu_ldl_le_data_ra(env, addr, GETPC());              \
+            for (e = 0; e < 2; e++, data >>= 16) {                      \
+                qd = (uint16_t *)aa32_vfp_qreg(env, qnidx + e);         \
+                qd[H2(off[beat])] = data;                               \
+            }                                                           \
+        }                                                               \
+    }
+
+#define DO_VLD2W(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        uint32_t *qd;                                                   \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat];                                    \
+            data = cpu_ldl_le_data_ra(env, addr, GETPC());              \
+            qd = (uint32_t *)aa32_vfp_qreg(env, qnidx + (beat & 1));    \
+            qd[H4(off[beat] >> 3)] = data;                              \
+        }                                                               \
+    }
+
+DO_VLD2B(vld20b, 0, 2, 12, 14)
+DO_VLD2B(vld21b, 4, 6, 8, 10)
+
+DO_VLD2H(vld20h, 0, 1, 6, 7)
+DO_VLD2H(vld21h, 2, 3, 4, 5)
+
+DO_VLD2W(vld20w, 0, 4, 24, 28)
+DO_VLD2W(vld21w, 8, 12, 16, 20)
+
+#define DO_VST4B(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat, e;                                                    \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 4;                                \
+            data = 0;                                                   \
+            for (e = 3; e >= 0; e--) {                                  \
+                uint8_t *qd = (uint8_t *)aa32_vfp_qreg(env, qnidx + e); \
+                data = (data << 8) | qd[H1(off[beat])];                 \
+            }                                                           \
+            cpu_stl_le_data_ra(env, addr, data, GETPC());               \
+        }                                                               \
+    }
+
+#define DO_VST4H(OP, O1, O2)                                            \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O1, O2, O2 };                          \
+        uint32_t addr, data;                                            \
+        int y; /* y counts 0 2 0 2 */                                   \
+        uint16_t *qd;                                                   \
+        for (beat = 0, y = 0; beat < 4; beat++, mask >>= 4, y ^= 2) {   \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 8 + (beat & 1) * 4;               \
+            qd = (uint16_t *)aa32_vfp_qreg(env, qnidx + y);             \
+            data = qd[H2(off[beat])];                                   \
+            qd = (uint16_t *)aa32_vfp_qreg(env, qnidx + y + 1);         \
+            data |= qd[H2(off[beat])] << 16;                            \
+            cpu_stl_le_data_ra(env, addr, data, GETPC());               \
+        }                                                               \
+    }
+
+#define DO_VST4W(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        uint32_t *qd;                                                   \
+        int y;                                                          \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 4;                                \
+            y = (beat + (O1 & 2)) & 3;                                  \
+            qd = (uint32_t *)aa32_vfp_qreg(env, qnidx + y);             \
+            data = qd[H4(off[beat] >> 2)];                              \
+            cpu_stl_le_data_ra(env, addr, data, GETPC());               \
+        }                                                               \
+    }
+
+DO_VST4B(vst40b, 0, 1, 10, 11)
+DO_VST4B(vst41b, 2, 3, 12, 13)
+DO_VST4B(vst42b, 4, 5, 14, 15)
+DO_VST4B(vst43b, 6, 7, 8, 9)
+
+DO_VST4H(vst40h, 0, 5)
+DO_VST4H(vst41h, 1, 6)
+DO_VST4H(vst42h, 2, 7)
+DO_VST4H(vst43h, 3, 4)
+
+DO_VST4W(vst40w, 0, 1, 10, 11)
+DO_VST4W(vst41w, 2, 3, 12, 13)
+DO_VST4W(vst42w, 4, 5, 14, 15)
+DO_VST4W(vst43w, 6, 7, 8, 9)
+
+#define DO_VST2B(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat, e;                                                    \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        uint8_t *qd;                                                    \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 2;                                \
+            data = 0;                                                   \
+            for (e = 3; e >= 0; e--) {                                  \
+                qd = (uint8_t *)aa32_vfp_qreg(env, qnidx + (e & 1));    \
+                data = (data << 8) | qd[H1(off[beat] + (e >> 1))];      \
+            }                                                           \
+            cpu_stl_le_data_ra(env, addr, data, GETPC());               \
+        }                                                               \
+    }
+
+#define DO_VST2H(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        int e;                                                          \
+        uint16_t *qd;                                                   \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat] * 4;                                \
+            data = 0;                                                   \
+            for (e = 1; e >= 0; e--) {                                  \
+                qd = (uint16_t *)aa32_vfp_qreg(env, qnidx + e);         \
+                data = (data << 16) | qd[H2(off[beat])];                \
+            }                                                           \
+            cpu_stl_le_data_ra(env, addr, data, GETPC());               \
+        }                                                               \
+    }
+
+#define DO_VST2W(OP, O1, O2, O3, O4)                                    \
+    void HELPER(mve_##OP)(CPUARMState *env, uint32_t qnidx,             \
+                          uint32_t base)                                \
+    {                                                                   \
+        int beat;                                                       \
+        uint16_t mask = mve_eci_mask(env);                              \
+        const int off[4] = { O1, O2, O3, O4 };                          \
+        uint32_t addr, data;                                            \
+        uint32_t *qd;                                                   \
+        for (beat = 0; beat < 4; beat++, mask >>= 4) {                  \
+            if ((mask & 1) == 0) {                                      \
+                /* ECI says skip this beat */                           \
+                continue;                                               \
+            }                                                           \
+            addr = base + off[beat];                                    \
+            qd = (uint32_t *)aa32_vfp_qreg(env, qnidx + (beat & 1));    \
+            data = qd[H4(off[beat] >> 3)];                              \
+            cpu_stl_le_data_ra(env, addr, data, GETPC());               \
+        }                                                               \
+    }
+
+DO_VST2B(vst20b, 0, 2, 12, 14)
+DO_VST2B(vst21b, 4, 6, 8, 10)
+
+DO_VST2H(vst20h, 0, 1, 6, 7)
+DO_VST2H(vst21h, 2, 3, 4, 5)
+
+DO_VST2W(vst20w, 0, 4, 24, 28)
+DO_VST2W(vst21w, 8, 12, 16, 20)
+
 /*
  * The mergemask(D, R, M) macro performs the operation "*D = R" but
  * storing only the bytes which correspond to 1 bits in M,
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index f4229e308ba..3ebc6356e4c 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -35,6 +35,7 @@ static inline int vidup_imm(DisasContext *s, int x)
 
 typedef void MVEGenLdStFn(TCGv_ptr, TCGv_ptr, TCGv_i32);
 typedef void MVEGenLdStSGFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
+typedef void MVEGenLdStIlFn(TCGv_ptr, TCGv_i32, TCGv_i32);
 typedef void MVEGenOneOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenTwoOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_ptr);
 typedef void MVEGenTwoOpScalarFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32);
@@ -366,6 +367,99 @@ static bool trans_VSTRD_sg_imm(DisasContext *s, arg_vldst_sg_imm *a)
     return do_ldst_sg_imm(s, a, fns[a->w], MO_64);
 }
 
+static bool do_vldst_il(DisasContext *s, arg_vldst_il *a, MVEGenLdStIlFn *fn,
+                        int addrinc)
+{
+    TCGv_i32 rn;
+
+    if (!dc_isar_feature(aa32_mve, s) ||
+        !mve_check_qreg_bank(s, a->qd) ||
+        !fn || (a->rn == 13 && a->w) || a->rn == 15) {
+        /* Variously UNPREDICTABLE or UNDEF or related-encoding */
+        return false;
+    }
+    if (!mve_eci_check(s) || !vfp_access_check(s)) {
+        return true;
+    }
+
+    rn = load_reg(s, a->rn);
+    /*
+     * We pass the index of Qd, not a pointer, because the helper must
+     * access multiple Q registers starting at Qd and working up.
+     */
+    fn(cpu_env, tcg_constant_i32(a->qd), rn);
+
+    if (a->w) {
+        tcg_gen_addi_i32(rn, rn, addrinc);
+        store_reg(s, a->rn, rn);
+    } else {
+        tcg_temp_free_i32(rn);
+    }
+    mve_update_and_store_eci(s);
+    return true;
+}
+
+/* This macro is just to make the arrays more compact in these functions */
+#define F(N) gen_helper_mve_##N
+
+static bool trans_VLD2(DisasContext *s, arg_vldst_il *a)
+{
+    static MVEGenLdStIlFn * const fns[4][4] = {
+        { F(vld20b), F(vld20h), F(vld20w), NULL, },
+        { F(vld21b), F(vld21h), F(vld21w), NULL, },
+        { NULL, NULL, NULL, NULL },
+        { NULL, NULL, NULL, NULL },
+    };
+    if (a->qd > 6) {
+        return false;
+    }
+    return do_vldst_il(s, a, fns[a->pat][a->size], 32);
+}
+
+static bool trans_VLD4(DisasContext *s, arg_vldst_il *a)
+{
+    static MVEGenLdStIlFn * const fns[4][4] = {
+        { F(vld40b), F(vld40h), F(vld40w), NULL, },
+        { F(vld41b), F(vld41h), F(vld41w), NULL, },
+        { F(vld42b), F(vld42h), F(vld42w), NULL, },
+        { F(vld43b), F(vld43h), F(vld43w), NULL, },
+    };
+    if (a->qd > 4) {
+        return false;
+    }
+    return do_vldst_il(s, a, fns[a->pat][a->size], 64);
+}
+
+static bool trans_VST2(DisasContext *s, arg_vldst_il *a)
+{
+    static MVEGenLdStIlFn * const fns[4][4] = {
+        { F(vst20b), F(vst20h), F(vst20w), NULL, },
+        { F(vst21b), F(vst21h), F(vst21w), NULL, },
+        { NULL, NULL, NULL, NULL },
+        { NULL, NULL, NULL, NULL },
+    };
+    if (a->qd > 6) {
+        return false;
+    }
+    return do_vldst_il(s, a, fns[a->pat][a->size], 32);
+}
+
+static bool trans_VST4(DisasContext *s, arg_vldst_il *a)
+{
+    static MVEGenLdStIlFn * const fns[4][4] = {
+        { F(vst40b), F(vst40h), F(vst40w), NULL, },
+        { F(vst41b), F(vst41h), F(vst41w), NULL, },
+        { F(vst42b), F(vst42h), F(vst42w), NULL, },
+        { F(vst43b), F(vst43h), F(vst43w), NULL, },
+    };
+    if (a->qd > 4) {
+        return false;
+    }
+    return do_vldst_il(s, a, fns[a->pat][a->size], 64);
+}
+
+#undef F
+
 static bool trans_VDUP(DisasContext *s, arg_VDUP *a)
 {
     TCGv_ptr qd;
-- 
2.20.1

Re: [PATCH for-6.2 01/34] target/arm: Note that we handle VMOVL as a special case of VSHLL

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
> Although the architecture doesn't define it as an alias, VMOVL
> (vector move long) is encoded as a VSHLL with a zero shift.
> Add a comment in the decode file noting that we handle VMOVL
> as part of VSHLL.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve.decode | 2 ++
>   1 file changed, 2 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 02/34] target/arm: Print MVE VPR in CPU dumps

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
> Include the MVE VPR register value in the CPU dumps produced by
> arm_cpu_dump_state() if we are printing FPU information. This
> makes it easier to interpret debug logs when predication is
> active.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/cpu.c | 3 +++
>   1 file changed, 3 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 04/34] target/arm: Fix signed VADDV

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
> A cut-and-paste error meant we handled signed VADDV like
> unsigned VADDV; fix the type used.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve_helper.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 03/34] target/arm: Fix MVE VSLI by 0 and VSRI by <dt>

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
>           if (shift == 0 || shift == ESIZE * 8) {                         \
>               /*                                                          \
>                * Only VSLI can shift by 0; only VSRI can shift by <dt>.   \
>                * The generic logic would give the right answer for 0 but  \
> -             * fails for <dt>.                                          \
> +             * fails for <dt>. In both cases, we must not shift the     \
> +             * input but just copy it to the destination, honouring     \
> +             * the predicate mask.                                      \
>                */                                                         \
> +            for (e = 0; e < 16 / 8; e++, mask >>= 8) {                  \
> +                mergemask(&d[H8(e)], m[H8(e)], mask);                   \
> +            }                                                           \
>               goto done;                                                  \
>           }                                                               \

VSLI is d = op1 << shift | (d & ~(-1 << shift))

for shift = 0 does result in d = op1.

However,

VRSI is d = op1 >> shift | (d & ~(-1 >> shift))

for shift = 32 results in d = d.


r~

Re: [PATCH for-6.2 05/34] target/arm: Fix mask handling for MVE narrowing operations

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
> In the MVE helpers for the narrowing operations (DO_VSHRN and
> DO_VSHRN_SAT) we were using the wrong bits of the predicate mask for
> the 'top' versions of the insn.  This is because the loop works over
> the double-sized input elements and shifts the predicate mask by that
> many bits each time, but when we write out the half-sized output we
> must look at the mask bits for whichever half of the element we are
> writing to.
> 
> Correct this by shifting the whole mask right by ESIZE bits for the
> 'top' insns.  This allows us also to simplify the saturation bit
> checking (where we had noticed that we needed to look at a different
> mask bit for the 'top' insn.)
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve_helper.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 06/34] target/arm: Fix 48-bit saturating shifts

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
> -    return (1ULL << 47) - (src >= 0);
> +    return sextract64((1ULL << 47) - (src >= 0), 0, 48);

Clearer as

   return src >= 0 ? MAKE_64BIT_MASK(0, 47) : MAKE_64BIT_MASK(47, 17);

?  Otherwise,

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~

Re: [PATCH for-6.2 07/34] target/arm: Fix calculation of LTP mask when LR is 0

[Richard Henderson]

On 7/13/21 6:36 AM, Peter Maydell wrote:
> In mve_element_mask(), we calculate a mask for tail predication which
> should have a number of 1 bits based on the value of LR.  However,
> our MAKE_64BIT_MASK() macro has undefined behaviour when passed a
> zero length.  Special case this to give the all-zeroes mask we
> require.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve_helper.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 06/34] target/arm: Fix 48-bit saturating shifts

[Peter Maydell]

On Fri, 16 Jul 2021 at 17:34, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 6:36 AM, Peter Maydell wrote:
> > -    return (1ULL << 47) - (src >= 0);
> > +    return sextract64((1ULL << 47) - (src >= 0), 0, 48);
>
> Clearer as
>
>    return src >= 0 ? MAKE_64BIT_MASK(0, 47) : MAKE_64BIT_MASK(47, 17);

Yeah, agreed.

thanks
-- PMM

Re: [PATCH for-6.2 08/34] target/arm: Fix VPT advance when ECI is non-zero

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> We were not paying attention to the ECI state when advancing the VPT
> state.  Architecturally, VPT state advance happens for every beat
> (see the pseudocode VPTAdvance()), so on every beat the 4 bits of
> VPR.P0 corresponding to the current beat are inverted if required,
> and at the end of beats 1 and 3 the VPR MASK fields are updated.
> This means that if the ECI state says we should not be executing all
> 4 beats then we need to skip some of the updating of the VPR that we
> currently do in mve_advance_vpt().
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve_helper.c | 29 +++++++++++++++++++++++------
>   1 file changed, 23 insertions(+), 6 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 09/34] target/arm: Factor out mve_eci_mask()

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> In some situations we need a mask telling us which parts of the
> vector correspond to beats that are not being executed because of
> ECI, separately from the combined "which bytes are predicated away"
> mask.  Factor this mask calculation out of mve_element_mask() into
> its own function.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve_helper.c | 58 ++++++++++++++++++++++++-----------------
>   1 file changed, 34 insertions(+), 24 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 08/34] target/arm: Fix VPT advance when ECI is non-zero

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
>       if (mask01 > 8) {
> -        /* high bit set, but not 0b1000: invert the relevant half of P0 */
> -        vpr ^= 0xff;
> +        if (eci == ECI_NONE) {
> +            /* high bit set, but not 0b1000: invert the relevant half of P0 */
> +            vpr ^= 0xff;
> +        } else if (eci == ECI_A0) {
> +            /* Invert only the beat 1 P0 bits, as we didn't execute beat 0 */
> +            vpr ^= 0xf0;
> +        } /* otherwise we didn't execute either beat 0 or beat 1 */
>       }
>       if (mask23 > 8) {
> -        /* high bit set, but not 0b1000: invert the relevant half of P0 */
> -        vpr ^= 0xff00;
> +        if (eci != ECI_A0A1A2 && eci != ECI_A0A1A2B0) {
> +            /* high bit set, but not 0b1000: invert the relevant half of P0 */
> +            vpr ^= 0xff00;
> +        } else {
> +            /* We didn't execute beat 2, only invert the beat 3 P0 bits */
> +            vpr ^= 0xf000;
> +        }
>       }

It might not be any cleaner, but I wondered if mve_eci_mask could help here.

   inv_mask = mve_eci_mask(...);
   if (mask01 <= 8) {
     inv_mask &= ~0xff;
   }
   if (mask23 <= 8) {
     inv_mask &= ~0xff00;
   }
   vpr ^= inv_mask;


r~

Re: [PATCH for-6.2 10/34] target/arm: Fix VLDRB/H/W for predicated elements

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> For vector loads, predicated elements are zeroed, instead of
> retaining their previous values (as happens for most data
> processing operations). This means we need to distinguish
> "beat not executed due to ECI" (don't touch destination
> element) from "beat executed but predicated out" (zero
> destination element).
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/mve_helper.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 11/34] target/arm: Implement MVE VMULL (polynomial)

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Implement the MVE VMULL (polynomial) insn.  Unlike Neon, this comes
> in two flavours: 8x8->16 and a 16x16->32.  Also unlike Neon, the
> inputs are in either the low or the high half of each double-width
> element.
> 
> The assembler for this insn indicates the size with "P8" or "P16",
> encoded into bit 28 as size = 0 or 1. We choose to follow the
> same encoding as VQDMULL and decode this into a->size as MO_16
> or MO_32 indicating the size of the result elements. This then
> carries through to the helper function names where it then
> matches up with the existing pmull_h() which does an 8x8->16
> operation and a new pmull_w() which does the 16x16->32.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  5 +++++
>   target/arm/vec_internal.h  | 11 +++++++++++
>   target/arm/mve.decode      | 14 ++++++++++----
>   target/arm/mve_helper.c    | 16 ++++++++++++++++
>   target/arm/translate-mve.c | 28 ++++++++++++++++++++++++++++
>   target/arm/vec_helper.c    | 14 +++++++++++++-
>   6 files changed, 83 insertions(+), 5 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 12/34] target/arm: Implement MVE incrementing/decrementing dup insns

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> +#define DO_VIDUP(OP, ESIZE, TYPE, FN)                           \
> +    uint32_t HELPER(mve_##OP)(CPUARMState *env, void *vd,       \
> +                           uint32_t offset, uint32_t imm)       \
> +    {                                                           \
> +        TYPE *d = vd;                                           \
> +        uint16_t mask = mve_element_mask(env);                  \
> +        unsigned e;                                             \
> +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
> +            mergemask(&d[H##ESIZE(e)], offset, mask);           \
> +            offset = FN(offset, imm);                           \
> +        }                                                       \
> +        mve_advance_vpt(env);                                   \
> +        return offset;                                          \
> +    }
> +
> +#define DO_VIWDUP(OP, ESIZE, TYPE, FN)                          \
> +    uint32_t HELPER(mve_##OP)(CPUARMState *env, void *vd,       \
> +                              uint32_t offset, uint32_t wrap,   \
> +                              uint32_t imm)                     \
> +    {                                                           \
> +        TYPE *d = vd;                                           \
> +        uint16_t mask = mve_element_mask(env);                  \
> +        unsigned e;                                             \
> +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
> +            mergemask(&d[H##ESIZE(e)], offset, mask);           \
> +            offset = FN(offset, wrap, imm);                     \
> +        }                                                       \
> +        mve_advance_vpt(env);                                   \
> +        return offset;                                          \
> +    }
> +
> +#define DO_VIDUP_ALL(OP, FN)                    \
> +    DO_VIDUP(OP##b, 1, int8_t, FN)              \
> +    DO_VIDUP(OP##h, 2, int16_t, FN)             \
> +    DO_VIDUP(OP##w, 4, int32_t, FN)
> +
> +#define DO_VIWDUP_ALL(OP, FN)                   \
> +    DO_VIWDUP(OP##b, 1, int8_t, FN)             \
> +    DO_VIWDUP(OP##h, 2, int16_t, FN)            \
> +    DO_VIWDUP(OP##w, 4, int32_t, FN)

Would it be useful to merge VIDUP and VIWDUP by passing wrap == 0?
Or merging VIDUP and VDDUP by negating imm?

Anyway,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~

Re: [PATCH for-6.2 13/34] target/arm: Factor out gen_vpst()

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Factor out the "generate code to update VPR.MASK01/MASK23" part of
> trans_VPST(); we are going to want to reuse it for the VPT insns.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/translate-mve.c | 31 +++++++++++++++++--------------
>   1 file changed, 17 insertions(+), 14 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 14/34] target/arm: Implement MVE integer vector comparisons

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Implement the MVE integer vector comparison instructions.  These are
> "VCMP (vector)" encodings T1, T2 and T3, and "VPT (vector)" encodings
> T1, T2 and T3.
> 
> These insns compare corresponding elements in each vector, and update
> the VPR.P0 predicate bits with the results of the comparison.  VPT
> also sets the VPR.MASK01 and VPR.MASK23 fields -- it is effectively
> "VCMP then VPST".
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    | 32 ++++++++++++++++++++++
>   target/arm/mve.decode      | 18 +++++++++++-
>   target/arm/mve_helper.c    | 56 ++++++++++++++++++++++++++++++++++++++
>   target/arm/translate-mve.c | 47 ++++++++++++++++++++++++++++++++
>   4 files changed, 152 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 15/34] target/arm: Implement MVE integer vector-vs-scalar comparisons

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Implement the MVE integer vector comparison instructions that compare
> each element against a scalar from a general purpose register.  These
> are "VCMP (vector)" encodings T4, T5 and T6 and "VPT (vector)"
> encodings T4, T5 and T6.
> 
> We have to move the decodetree pattern for VPST, because it
> overlaps with VCMP T4 with size = 0b11.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    | 32 +++++++++++++++++++++++++++
>   target/arm/mve.decode      | 18 +++++++++++++---
>   target/arm/mve_helper.c    | 44 +++++++++++++++++++++++++++++++-------
>   target/arm/translate-mve.c | 43 +++++++++++++++++++++++++++++++++++++
>   4 files changed, 126 insertions(+), 11 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 16/34] target/arm: Implement MVE VPSEL

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Implement the MVE VPSEL insn, which sets each byte of the destination
> vector Qd to the byte from either Qn or Qm depending on the value of
> the corresponding bit in VPR.P0.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  2 ++
>   target/arm/mve.decode      |  7 +++++--
>   target/arm/mve_helper.c    | 19 +++++++++++++++++++
>   target/arm/translate-mve.c |  2 ++
>   4 files changed, 28 insertions(+), 2 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 17/34] target/arm: Implement MVE VMLAS

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Implement the MVE VMLAS insn, which multiplies a vector by a vector
> and adds a scalar.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  8 ++++++++
>   target/arm/mve.decode      |  3 +++
>   target/arm/mve_helper.c    | 31 +++++++++++++++++++++++++++++++
>   target/arm/translate-mve.c |  2 ++
>   4 files changed, 44 insertions(+)
...

> +/* Vector by vector plus scalar */
> +#define DO_VMLAS(D, N, M) ((N) * (D) + (M))
> +
> +DO_2OP_ACC_SCALAR_S(vmlass, DO_VMLAS)
> +DO_2OP_ACC_SCALAR_U(vmlasu, DO_VMLAS)

This is confusing.  The ARM says

# Operations that do not perform
# widening are always unsigned (encoded with U=1),

This instruction does not perform widening, but it then codes on to enumerate the 
signed/unsigned encodings.

I suppose you're matching what's written, so
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~

Re: [PATCH for-6.2 18/34] target/arm: Implement MVE shift-by-scalar

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> Implement the MVE instructions which perform shifts by a scalar.
> These are VSHL T2, VRSHL T2, VQSHL T1 and VQRSHL T2.  They take the
> shift amount in a general purpose register and shift every element in
> the vector by that amount.
> 
> Mostly we can reuse the helper functions for shift-by-immediate; we
> do need two new helpers for VQRSHL.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  8 +++++++
>   target/arm/mve.decode      | 23 ++++++++++++++++---
>   target/arm/mve_helper.c    |  2 ++
>   target/arm/translate-mve.c | 46 ++++++++++++++++++++++++++++++++++++++
>   4 files changed, 76 insertions(+), 3 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 19/34] target/arm: Move 'x' and 'a' bit definitions into vmlaldav formats

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> All the users of the vmlaldav formats have an 'x bit in bit 12 and an
> 'a' bit in bit 5; move these to the format rather than specifying them
> in each insn pattern.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
> Not sure why I didn't write it this way in the first place;
> when I came to implement VMLADAV I noticed the oddity and
> preferred to fix it rather than either copying it for VMLADAV
> or having VMLADAV different.
> ---
>   target/arm/mve.decode | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 17/34] target/arm: Implement MVE VMLAS

[Peter Maydell]

On Fri, 16 Jul 2021 at 23:12, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 6:37 AM, Peter Maydell wrote:
> > Implement the MVE VMLAS insn, which multiplies a vector by a vector
> > and adds a scalar.
> >
> > Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> > ---
> >   target/arm/helper-mve.h    |  8 ++++++++
> >   target/arm/mve.decode      |  3 +++
> >   target/arm/mve_helper.c    | 31 +++++++++++++++++++++++++++++++
> >   target/arm/translate-mve.c |  2 ++
> >   4 files changed, 44 insertions(+)
> ...
>
> > +/* Vector by vector plus scalar */
> > +#define DO_VMLAS(D, N, M) ((N) * (D) + (M))
> > +
> > +DO_2OP_ACC_SCALAR_S(vmlass, DO_VMLAS)
> > +DO_2OP_ACC_SCALAR_U(vmlasu, DO_VMLAS)
>
> This is confusing.  The ARM says
>
> # Operations that do not perform
> # widening are always unsigned (encoded with U=1),

I have noticed that that text often appears for insns where it doesn't
really apply. I mostly ignore the text in favour of looking at
the pseudocode for working out what is supposed to be done.

-- PMM

Re: [PATCH for-6.2 17/34] target/arm: Implement MVE VMLAS

[Richard Henderson]

On 7/17/21 3:06 AM, Peter Maydell wrote:
> On Fri, 16 Jul 2021 at 23:12, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> On 7/13/21 6:37 AM, Peter Maydell wrote:
>>> Implement the MVE VMLAS insn, which multiplies a vector by a vector
>>> and adds a scalar.
>>>
>>> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
>>> ---
>>>    target/arm/helper-mve.h    |  8 ++++++++
>>>    target/arm/mve.decode      |  3 +++
>>>    target/arm/mve_helper.c    | 31 +++++++++++++++++++++++++++++++
>>>    target/arm/translate-mve.c |  2 ++
>>>    4 files changed, 44 insertions(+)
>> ...
>>
>>> +/* Vector by vector plus scalar */
>>> +#define DO_VMLAS(D, N, M) ((N) * (D) + (M))
>>> +
>>> +DO_2OP_ACC_SCALAR_S(vmlass, DO_VMLAS)
>>> +DO_2OP_ACC_SCALAR_U(vmlasu, DO_VMLAS)
>>
>> This is confusing.  The ARM says
>>
>> # Operations that do not perform
>> # widening are always unsigned (encoded with U=1),
> 
> I have noticed that that text often appears for insns where it doesn't
> really apply. I mostly ignore the text in favour of looking at
> the pseudocode for working out what is supposed to be done.

Yes, but in this case there's nothing about the pseudocode that suggests that sign matters 
at all.  Neither the multiply nor the addition are widening.  So is there really a signed 
VMLAS instruction?


r~

Re: [PATCH for-6.2 20/34] target/arm: Implement MVE integer min/max across vector

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> +/* Max and min of absolute values */
> +static int64_t do_maxa(int64_t n, int64_t m)
> +{
> +    if (n < 0) {
> +        n = -n;
> +    }
> +    if (m < 0) {
> +        m = -m;
> +    }
> +    return MAX(n, m);
> +}

This doesn't look quite right.  The n operand is extracted unsigned, and only the m 
operand is subjected to ABS.


r~

Re: [PATCH for-6.2 21/34] target/arm: Implement MVE VABAV

[Richard Henderson]

On 7/13/21 6:37 AM, Peter Maydell wrote:
> +#define DO_VABAV(OP, ESIZE, TYPE)                               \
> +    uint32_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vn, \
> +                                    void *vm, uint32_t ra)      \
> +    {                                                           \
> +        uint16_t mask = mve_element_mask(env);                  \
> +        unsigned e;                                             \
> +        TYPE *m = vm, *n = vn;                                  \
> +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
> +            if (mask & 1) {                                     \
> +                int64_t n0 = n[H##ESIZE(e)];                    \
> +                int64_t m0 = m[H##ESIZE(e)];                    \
> +                uint32_t r = n0 >= m0 ? (n0 - m0) : (m0 - n0);  \

Any particular reason you're not using TYPE for n0 and m0?

Otherwise,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~

Re: [PATCH for-6.2 21/34] target/arm: Implement MVE VABAV

[Peter Maydell]

On Sat, 17 Jul 2021 at 21:50, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 6:37 AM, Peter Maydell wrote:
> > +#define DO_VABAV(OP, ESIZE, TYPE)                               \
> > +    uint32_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vn, \
> > +                                    void *vm, uint32_t ra)      \
> > +    {                                                           \
> > +        uint16_t mask = mve_element_mask(env);                  \
> > +        unsigned e;                                             \
> > +        TYPE *m = vm, *n = vn;                                  \
> > +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
> > +            if (mask & 1) {                                     \
> > +                int64_t n0 = n[H##ESIZE(e)];                    \
> > +                int64_t m0 = m[H##ESIZE(e)];                    \
> > +                uint32_t r = n0 >= m0 ? (n0 - m0) : (m0 - n0);  \
>
> Any particular reason you're not using TYPE for n0 and m0?

I wanted to definitely be doing the subtraction with a signed
type wider than the inputs, because that's the way the
pseudocode effectively deals with it, and I didn't feel like
thinking through whether using the smaller and possibly
unsigned types would DTRT :-)

-- PMM

Re: [PATCH for-6.2 21/34] target/arm: Implement MVE VABAV

[Richard Henderson]

On 7/17/21 3:13 PM, Peter Maydell wrote:
> On Sat, 17 Jul 2021 at 21:50, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> On 7/13/21 6:37 AM, Peter Maydell wrote:
>>> +#define DO_VABAV(OP, ESIZE, TYPE)                               \
>>> +    uint32_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vn, \
>>> +                                    void *vm, uint32_t ra)      \
>>> +    {                                                           \
>>> +        uint16_t mask = mve_element_mask(env);                  \
>>> +        unsigned e;                                             \
>>> +        TYPE *m = vm, *n = vn;                                  \
>>> +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
>>> +            if (mask & 1) {                                     \
>>> +                int64_t n0 = n[H##ESIZE(e)];                    \
>>> +                int64_t m0 = m[H##ESIZE(e)];                    \
>>> +                uint32_t r = n0 >= m0 ? (n0 - m0) : (m0 - n0);  \
>>
>> Any particular reason you're not using TYPE for n0 and m0?
> 
> I wanted to definitely be doing the subtraction with a signed
> type wider than the inputs, because that's the way the
> pseudocode effectively deals with it, and I didn't feel like
> thinking through whether using the smaller and possibly
> unsigned types would DTRT :-)

Fair enough.  Now that I think of it, I would expect the compiler to narrow the operation 
based on the result type.  So, unconditional r-b.

r~

Re: [PATCH for-6.2 08/34] target/arm: Fix VPT advance when ECI is non-zero

[Peter Maydell]

On Fri, 16 Jul 2021 at 17:58, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 6:37 AM, Peter Maydell wrote:
> >       if (mask01 > 8) {
> > -        /* high bit set, but not 0b1000: invert the relevant half of P0 */
> > -        vpr ^= 0xff;
> > +        if (eci == ECI_NONE) {
> > +            /* high bit set, but not 0b1000: invert the relevant half of P0 */
> > +            vpr ^= 0xff;
> > +        } else if (eci == ECI_A0) {
> > +            /* Invert only the beat 1 P0 bits, as we didn't execute beat 0 */
> > +            vpr ^= 0xf0;
> > +        } /* otherwise we didn't execute either beat 0 or beat 1 */
> >       }
> >       if (mask23 > 8) {
> > -        /* high bit set, but not 0b1000: invert the relevant half of P0 */
> > -        vpr ^= 0xff00;
> > +        if (eci != ECI_A0A1A2 && eci != ECI_A0A1A2B0) {
> > +            /* high bit set, but not 0b1000: invert the relevant half of P0 */
> > +            vpr ^= 0xff00;
> > +        } else {
> > +            /* We didn't execute beat 2, only invert the beat 3 P0 bits */
> > +            vpr ^= 0xf000;
> > +        }
> >       }
>
> It might not be any cleaner, but I wondered if mve_eci_mask could help here.
>
>    inv_mask = mve_eci_mask(...);
>    if (mask01 <= 8) {
>      inv_mask &= ~0xff;
>    }
>    if (mask23 <= 8) {
>      inv_mask &= ~0xff00;
>    }
>    vpr ^= inv_mask;

Yes, I think that works better (you need to capture the ECI mask at the
start of the function before we update env->condexec_bits, though).

thanks
-- PMM

Re: [PATCH for-6.2 12/34] target/arm: Implement MVE incrementing/decrementing dup insns

[Peter Maydell]

On Fri, 16 Jul 2021 at 20:57, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 6:37 AM, Peter Maydell wrote:
> > +#define DO_VIDUP(OP, ESIZE, TYPE, FN)                           \
> > +    uint32_t HELPER(mve_##OP)(CPUARMState *env, void *vd,       \
> > +                           uint32_t offset, uint32_t imm)       \
> > +    {                                                           \
> > +        TYPE *d = vd;                                           \
> > +        uint16_t mask = mve_element_mask(env);                  \
> > +        unsigned e;                                             \
> > +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
> > +            mergemask(&d[H##ESIZE(e)], offset, mask);           \
> > +            offset = FN(offset, imm);                           \
> > +        }                                                       \
> > +        mve_advance_vpt(env);                                   \
> > +        return offset;                                          \
> > +    }
> > +
> > +#define DO_VIWDUP(OP, ESIZE, TYPE, FN)                          \
> > +    uint32_t HELPER(mve_##OP)(CPUARMState *env, void *vd,       \
> > +                              uint32_t offset, uint32_t wrap,   \
> > +                              uint32_t imm)                     \
> > +    {                                                           \
> > +        TYPE *d = vd;                                           \
> > +        uint16_t mask = mve_element_mask(env);                  \
> > +        unsigned e;                                             \
> > +        for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) {      \
> > +            mergemask(&d[H##ESIZE(e)], offset, mask);           \
> > +            offset = FN(offset, wrap, imm);                     \
> > +        }                                                       \
> > +        mve_advance_vpt(env);                                   \
> > +        return offset;                                          \
> > +    }
> > +
> > +#define DO_VIDUP_ALL(OP, FN)                    \
> > +    DO_VIDUP(OP##b, 1, int8_t, FN)              \
> > +    DO_VIDUP(OP##h, 2, int16_t, FN)             \
> > +    DO_VIDUP(OP##w, 4, int32_t, FN)
> > +
> > +#define DO_VIWDUP_ALL(OP, FN)                   \
> > +    DO_VIWDUP(OP##b, 1, int8_t, FN)             \
> > +    DO_VIWDUP(OP##h, 2, int16_t, FN)            \
> > +    DO_VIWDUP(OP##w, 4, int32_t, FN)
>
> Would it be useful to merge VIDUP and VIWDUP by passing wrap == 0?
> Or merging VIDUP and VDDUP by negating imm?

I think keeping the wrap-versions separate is clearer, but yes,
we might as well do the negate in the caller for VDDUP.
(VIWDUP and VDWDUP have different enough wrapping behaviour
that I'd prefer to not combine those).

thanks
-- PMM

Re: [PATCH for-6.2 20/34] target/arm: Implement MVE integer min/max across vector

[Peter Maydell]

On Sat, 17 Jul 2021 at 21:46, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 6:37 AM, Peter Maydell wrote:
> > +/* Max and min of absolute values */
> > +static int64_t do_maxa(int64_t n, int64_t m)
> > +{
> > +    if (n < 0) {
> > +        n = -n;
> > +    }
> > +    if (m < 0) {
> > +        m = -m;
> > +    }
> > +    return MAX(n, m);
> > +}
>
> This doesn't look quite right.  The n operand is extracted unsigned, and only the m
> operand is subjected to ABS.

Yes, you're right (this patch does always extract ra (here n)
unsigned, so the only case where it makes a difference is
VMINAV when the input ra is negative). I noticed this wrinkle
when implementing the FP variant of this insn, but missed it here.

-- PMM

Re: [PATCH for-6.2 17/34] target/arm: Implement MVE VMLAS

[Peter Maydell]

On Sat, 17 Jul 2021 at 21:40, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/17/21 3:06 AM, Peter Maydell wrote:
> > On Fri, 16 Jul 2021 at 23:12, Richard Henderson
> > <richard.henderson@linaro.org> wrote:
> >>
> >> On 7/13/21 6:37 AM, Peter Maydell wrote:
> >>> Implement the MVE VMLAS insn, which multiplies a vector by a vector
> >>> and adds a scalar.
> >>>
> >>> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> >>> ---
> >>>    target/arm/helper-mve.h    |  8 ++++++++
> >>>    target/arm/mve.decode      |  3 +++
> >>>    target/arm/mve_helper.c    | 31 +++++++++++++++++++++++++++++++
> >>>    target/arm/translate-mve.c |  2 ++
> >>>    4 files changed, 44 insertions(+)
> >> ...
> >>
> >>> +/* Vector by vector plus scalar */
> >>> +#define DO_VMLAS(D, N, M) ((N) * (D) + (M))
> >>> +
> >>> +DO_2OP_ACC_SCALAR_S(vmlass, DO_VMLAS)
> >>> +DO_2OP_ACC_SCALAR_U(vmlasu, DO_VMLAS)
> >>
> >> This is confusing.  The ARM says
> >>
> >> # Operations that do not perform
> >> # widening are always unsigned (encoded with U=1),
> >
> > I have noticed that that text often appears for insns where it doesn't
> > really apply. I mostly ignore the text in favour of looking at
> > the pseudocode for working out what is supposed to be done.

NB that in the latest version of the v8M Arm ARM (B.p) the
"operations that do not perform widening..." text has been removed.

> Yes, but in this case there's nothing about the pseudocode that suggests that sign matters
> at all.  Neither the multiply nor the addition are widening.  So is there really a signed
> VMLAS instruction?

There really is a U bit, but it doesn't affect the result :-)
I will remove the unnecessary extra set of helpers (similarly
for VMLA vector-by-scalar-plus-vector)...

thanks
-- PMM

Re: [PATCH for-6.2 20/34] target/arm: Implement MVE integer min/max across vector

[Peter Maydell]

On Mon, 19 Jul 2021 at 16:28, Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Sat, 17 Jul 2021 at 21:46, Richard Henderson
> <richard.henderson@linaro.org> wrote:
> >
> > On 7/13/21 6:37 AM, Peter Maydell wrote:
> > > +/* Max and min of absolute values */
> > > +static int64_t do_maxa(int64_t n, int64_t m)
> > > +{
> > > +    if (n < 0) {
> > > +        n = -n;
> > > +    }
> > > +    if (m < 0) {
> > > +        m = -m;
> > > +    }
> > > +    return MAX(n, m);
> > > +}
> >
> > This doesn't look quite right.  The n operand is extracted unsigned, and only the m
> > operand is subjected to ABS.
>
> Yes, you're right (this patch does always extract ra (here n)
> unsigned, so the only case where it makes a difference is
> VMINAV when the input ra is negative). I noticed this wrinkle
> when implementing the FP variant of this insn, but missed it here.

In fact it doesn't make a difference for this integer version:
because we always extract n as an unsigned value, 'n' is always
positive (either because it's the initial unsigned 'ra' or
because it's the result of a previous do_maxa/do_mina, which
must also always be positive) and so taking the absolute value
of 'n' never affects it. But we might as well delete the unused code.

(For float it *does* make a difference, because there's no
"extract as unsigned" for floats, and so the input 'ra' and
thus the first 'n' can be negative there.)

-- PMM

Re: [PATCH for-6.2 22/34] target/arm: Implement MVE narrowing moves

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE narrowing move insns VMOVN, VQMOVN and VQMOVUN.
> These take a double-width input, narrow it (possibly saturating) and
> store the result to either the top or bottom half of the output
> element.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    | 20 ++++++++++
>   target/arm/mve.decode      | 12 ++++++
>   target/arm/mve_helper.c    | 78 ++++++++++++++++++++++++++++++++++++++
>   target/arm/translate-mve.c | 22 +++++++++++
>   4 files changed, 132 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 23/34] target/arm: Rename MVEGenDualAccOpFn to MVEGenLongDualAccOpFn

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> The MVEGenDualAccOpFn is a bit misnamed, since it is used for
> the "long dual accumulate" operations that use a 64-bit
> accumulator. Rename it to MVEGenLongDualAccOpFn so we can
> use the former name for the 32-bit accumulator insns.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/translate-mve.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 24/34] target/arm: Implement MVE VMLADAV and VMLSLDAV

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VMLADAV and VMLSLDAV insns.  Like the VMLALDAV and
> VMLSLDAV insns already implemented, these accumulate multiplied
> vector elements; but they accumulate a 32-bit result rather than a
> 64-bit one.
> 
> Note that these encodings overlap with what would be RdaHi=0b111 for
> VMLALDAV, VMLSLDAV, VRMLALDAVH and VRMLSLDAVH.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    | 17 ++++++++++
>   target/arm/mve.decode      | 33 +++++++++++++++++---
>   target/arm/mve_helper.c    | 41 ++++++++++++++++++++++++
>   target/arm/translate-mve.c | 64 ++++++++++++++++++++++++++++++++++++++
>   4 files changed, 150 insertions(+), 5 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 25/34] target/arm: Implement MVE VMLA

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VMLA insn, which multiplies a vector by a scalar
> and accumulates into another vector.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    | 8 ++++++++
>   target/arm/mve.decode      | 3 +++
>   target/arm/mve_helper.c    | 6 ++++++
>   target/arm/translate-mve.c | 2 ++
>   4 files changed, 19 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 26/34] target/arm: Implement MVE saturating doubling multiply accumulates

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE saturating doubling multiply accumulate insns
> VQDMLAH, VQRDMLAH, VQDMLASH and VQRDMLASH.  These perform a multiply,
> double, add the accumulator shifted by the element size, possibly
> round, saturate to twice the element size, then take the high half of
> the result.  The *MLAH insns do vector * scalar + vector, and the
> *MLASH insns do vector * vector + scalar.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    | 16 +++++++
>   target/arm/mve.decode      |  5 ++
>   target/arm/mve_helper.c    | 95 ++++++++++++++++++++++++++++++++++++++
>   target/arm/translate-mve.c |  4 ++
>   4 files changed, 120 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 27/34] target/arm: Implement MVE VQABS, VQNEG

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE 1-operand saturating operations VQABS and VQNEG.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  8 ++++++++
>   target/arm/mve.decode      |  3 +++
>   target/arm/mve_helper.c    | 37 +++++++++++++++++++++++++++++++++++++
>   target/arm/translate-mve.c |  2 ++
>   4 files changed, 50 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 28/34] target/arm: Implement MVE VMAXA, VMINA

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VMAXA and VMINA insns, which take the absolute
> value of the signed elements in the input vector and then accumulate
> the unsigned max or min into the destination vector.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  8 ++++++++
>   target/arm/mve.decode      |  4 ++++
>   target/arm/mve_helper.c    | 26 ++++++++++++++++++++++++++
>   target/arm/translate-mve.c |  2 ++
>   4 files changed, 40 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 29/34] target/arm: Implement MVE VMOV to/from 2 general-purpose registers

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VMOV forms that move data between 2 general-purpose
> registers and 2 32-bit lanes in a vector register.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/translate-a32.h |  1 +
>   target/arm/mve.decode      |  4 ++
>   target/arm/translate-mve.c | 85 ++++++++++++++++++++++++++++++++++++++
>   target/arm/translate-vfp.c |  2 +-
>   4 files changed, 91 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 30/34] target/arm: Implement MVE VPNOT

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VPNOT insn, which inverts the bits in VPR.P0
> (subject to both predication and to beatwise execution).
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  1 +
>   target/arm/mve.decode      |  1 +
>   target/arm/mve_helper.c    | 17 +++++++++++++++++
>   target/arm/translate-mve.c | 19 +++++++++++++++++++
>   4 files changed, 38 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 31/34] target/arm: Implement MVE VCTP

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VCTP insn, which sets the VPR.P0 predicate bits so
> as to predicate any element at index Rn or greater is predicated.  As
> with VPNOT, this insn itself is predicable and subject to beatwise
> execution.
> 
> The calculation of the mask is the same as is used to determine
> ltpmask in mve_element_mask(), but we precalculate masklen in
> generated code to avoid having to have 4 helpers specialized by size.
> 
> We put the decode line in with the low-overhead-loop insns in
> t32.decode because it's logically part of that collection of insn
> patterns, even though it is an MVE only insn.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  2 ++
>   target/arm/translate-a32.h |  1 +
>   target/arm/t32.decode      |  1 +
>   target/arm/mve_helper.c    | 20 ++++++++++++++++++++
>   target/arm/translate-mve.c |  2 +-
>   target/arm/translate.c     | 33 +++++++++++++++++++++++++++++++++
>   6 files changed, 58 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 32/34] target/arm: Implement MVE scatter-gather insns

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> +static bool do_ldst_sg(DisasContext *s, arg_vldst_sg *a, MVEGenLdStSGFn fn)
> +{
> +    TCGv_i32 addr;
> +    TCGv_ptr qd, qm;
> +
> +    if (!dc_isar_feature(aa32_mve, s) ||
> +        !mve_check_qreg_bank(s, a->qd | a->qm) ||
> +        !fn || a->rn == 15) {
> +        /* Rn case is UNPREDICTABLE */
> +        return false;
> +    }

No Qd != Qm check for loads?  Given that we know in advance that it simply won't work for 
VLDRD, it would be nice to diagnose the error.

> +static bool trans_VLDR_S_sg(DisasContext *s, arg_vldst_sg *a)
> +{
> +    static MVEGenLdStSGFn * const fns[2][4][4] = { {
> +            { NULL, F(vldrb_sg_sh), F(vldrb_sg_sw), NULL },
> +            { NULL, NULL,           F(vldrh_sg_sw), NULL },
> +            { NULL, NULL,           NULL,           NULL },
> +            { NULL, NULL,           NULL,           NULL }
> +        }, {
> +            { NULL, NULL,              NULL,              NULL },
> +            { NULL, NULL,              F(vldrh_sg_os_sw), NULL },
> +            { NULL, NULL,              NULL,              NULL },
> +            { NULL, NULL,              NULL,              NULL }
> +        }
> +    };

A little bit unfortunate with table density here, but whatever.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~

Re: [PATCH for-6.2 33/34] target/arm: Implement MVE scatter-gather immediate forms

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> Implement the MVE VLDR/VSTR insns which do scatter-gather using base
> addresses from Qm plus or minus an immediate offset (possibly with
> writeback). Note that writeback is not predicated but it does have
> to honour ECI state, so we have to add an eci_mask check to the
> VSTR_SG macros (the VLDR_SG macros already needed this to be able
> to distinguish "skip beat" from "set predicated element to 0").
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper-mve.h    |  5 +++
>   target/arm/mve.decode      | 10 +++++
>   target/arm/mve_helper.c    | 91 ++++++++++++++++++++++++--------------
>   target/arm/translate-mve.c | 66 +++++++++++++++++++++++++++
>   4 files changed, 140 insertions(+), 32 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH for-6.2 32/34] target/arm: Implement MVE scatter-gather insns

[Peter Maydell]

On Thu, 22 Jul 2021 at 01:36, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 7/13/21 3:37 AM, Peter Maydell wrote:
> > +static bool do_ldst_sg(DisasContext *s, arg_vldst_sg *a, MVEGenLdStSGFn fn)
> > +{
> > +    TCGv_i32 addr;
> > +    TCGv_ptr qd, qm;
> > +
> > +    if (!dc_isar_feature(aa32_mve, s) ||
> > +        !mve_check_qreg_bank(s, a->qd | a->qm) ||
> > +        !fn || a->rn == 15) {
> > +        /* Rn case is UNPREDICTABLE */
> > +        return false;
> > +    }
>
> No Qd != Qm check for loads?  Given that we know in advance that it simply won't work for
> VLDRD, it would be nice to diagnose the error.
>
> > +static bool trans_VLDR_S_sg(DisasContext *s, arg_vldst_sg *a)
> > +{
> > +    static MVEGenLdStSGFn * const fns[2][4][4] = { {
> > +            { NULL, F(vldrb_sg_sh), F(vldrb_sg_sw), NULL },
> > +            { NULL, NULL,           F(vldrh_sg_sw), NULL },
> > +            { NULL, NULL,           NULL,           NULL },
> > +            { NULL, NULL,           NULL,           NULL }
> > +        }, {
> > +            { NULL, NULL,              NULL,              NULL },
> > +            { NULL, NULL,              F(vldrh_sg_os_sw), NULL },
> > +            { NULL, NULL,              NULL,              NULL },
> > +            { NULL, NULL,              NULL,              NULL }
> > +        }
> > +    };
>
> A little bit unfortunate with table density here, but whatever.

Yes; I initially wrote things this way incorrectly thinking more of the
tables would be populated than they are, but I think overall it's
a fairly readable way to go.

I noticed yesterday that these load/store implementations aren't
enforcing the alignment fault requirements, though, so I need to
add that.

thanks
-- PMM

Re: [PATCH for-6.2 34/34] target/arm: Implement MVE interleaving loads/stores

[Richard Henderson]

On 7/13/21 3:37 AM, Peter Maydell wrote:
> +        const int off[4] = { O1, O2, O3, O4 };                          \

static?  uint8_t?

Otherwise, with the help of your little print program, I can confirm that these offsets 
match what the pseudocode produces.  I hope this while beat execution thing really pays 
off in hw, because this description is nuts.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~