[PATCH 00/12] target/mips: FPU and other cleanups and improvements

[PATCH 00/12] target/mips: FPU and other cleanups and improvements

[Aleksandar Markovic]

This series contains mostly cosmetic FPU cleanups aimed to
make source code recognition easier for tools like gdb, gcov,
calgrind, and others.

There is also a patch that refactors conversion from ieee to
mips fp exception flags. This refactoring will improve the
performance of almost all fp-related mips instructions, albait
very modestly (less that one percent).

Finally, there is a patch that frees mips_malta.c from
checkpatch warnings.

Aleksandar Markovic (12):
  target/mips: fpu: Demacro ADD.<D|S|PS>
  target/mips: fpu: Demacro SUB.<D|S|PS>
  target/mips: fpu: Demacro MUL.<D|S|PS>
  target/mips: fpu: Demacro DIV.<D|S|PS>
  target/mips: fpu: Remove now unused macro FLOAT_BINOP
  target/mips: fpu: Demacro MADD.<D|S|PS>
  target/mips: fpu: Demacro MSUB.<D|S|PS>
  target/mips: fpu: Demacro NMADD.<D|S|PS>
  target/mips: fpu: Demacro NMSUB.<D|S|PS>
  target/mips: fpu: Remove now unused UNFUSED_FMA and FLOAT_FMA macros
  target/mips: fpu: Refactor conversion from ieee to mips exception
    flags
  hw/mips: Convert Malta "ifdef 0"-ed code to comments

 hw/mips/mips_malta.c     |  20 +-
 target/mips/fpu_helper.c | 458 +++++++++++++++++++++++++++++----------
 target/mips/internal.h   |   1 -
 target/mips/msa_helper.c |  77 ++++---
 4 files changed, 402 insertions(+), 154 deletions(-)

-- 
2.20.1

[PATCH 01/12] target/mips: fpu: Demacro ADD.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index 5287c86c61..984f3f4dfb 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1208,12 +1208,48 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,           \
     return ((uint64_t)wth2 << 32) | wt2;                           \
 }
 
-FLOAT_BINOP(add)
 FLOAT_BINOP(sub)
 FLOAT_BINOP(mul)
 FLOAT_BINOP(div)
 #undef FLOAT_BINOP
 
+uint64_t helper_float_add_d(CPUMIPSState *env,
+                            uint64_t fdt0, uint64_t fdt1)
+{
+    uint64_t dt2;
+
+    dt2 = float64_add(fdt0, fdt1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return dt2;
+}
+
+uint32_t helper_float_add_s(CPUMIPSState *env,
+                            uint32_t fst0, uint32_t fst1)
+{
+    uint32_t wt2;
+
+    wt2 = float32_sub(fst0, fst1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return wt2;
+}
+
+uint64_t helper_float_add_ps(CPUMIPSState *env,
+                             uint64_t fdt0, uint64_t fdt1)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t wtl2;
+    uint32_t wth2;
+
+    wtl2 = float32_add(fstl0, fstl1, &env->active_fpu.fp_status);
+    wth2 = float32_add(fsth0, fsth1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return ((uint64_t)wth2 << 32) | wtl2;
+}
+
+
 /* MIPS specific binary operations */
 uint64_t helper_float_recip2_d(CPUMIPSState *env, uint64_t fdt0, uint64_t fdt2)
 {
-- 
2.20.1

[PATCH 02/12] target/mips: fpu: Demacro SUB.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index 984f3f4dfb..715a872cae 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1208,7 +1208,6 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,           \
     return ((uint64_t)wth2 << 32) | wt2;                           \
 }
 
-FLOAT_BINOP(sub)
 FLOAT_BINOP(mul)
 FLOAT_BINOP(div)
 #undef FLOAT_BINOP
@@ -1249,6 +1248,42 @@ uint64_t helper_float_add_ps(CPUMIPSState *env,
     return ((uint64_t)wth2 << 32) | wtl2;
 }
 
+uint64_t helper_float_sub_d(CPUMIPSState *env,
+                            uint64_t fdt0, uint64_t fdt1)
+{
+    uint64_t dt2;
+
+    dt2 = float64_sub(fdt0, fdt1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return dt2;
+}
+
+uint32_t helper_float_sub_s(CPUMIPSState *env,
+                            uint32_t fst0, uint32_t fst1)
+{
+    uint32_t wt2;
+
+    wt2 = float32_sub(fst0, fst1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return wt2;
+}
+
+uint64_t helper_float_sub_ps(CPUMIPSState *env,
+                             uint64_t fdt0, uint64_t fdt1)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t wtl2;
+    uint32_t wth2;
+
+    wtl2 = float32_sub(fstl0, fstl1, &env->active_fpu.fp_status);
+    wth2 = float32_sub(fsth0, fsth1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return ((uint64_t)wth2 << 32) | wtl2;
+}
+
 
 /* MIPS specific binary operations */
 uint64_t helper_float_recip2_d(CPUMIPSState *env, uint64_t fdt0, uint64_t fdt2)
-- 
2.20.1

[PATCH 03/12] target/mips: fpu: Demacro MUL.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index 715a872cae..449e945166 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1208,7 +1208,6 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,           \
     return ((uint64_t)wth2 << 32) | wt2;                           \
 }
 
-FLOAT_BINOP(mul)
 FLOAT_BINOP(div)
 #undef FLOAT_BINOP
 
@@ -1284,6 +1283,42 @@ uint64_t helper_float_sub_ps(CPUMIPSState *env,
     return ((uint64_t)wth2 << 32) | wtl2;
 }
 
+uint64_t helper_float_mul_d(CPUMIPSState *env,
+                            uint64_t fdt0, uint64_t fdt1)
+{
+    uint64_t dt2;
+
+    dt2 = float64_mul(fdt0, fdt1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return dt2;
+}
+
+uint32_t helper_float_mul_s(CPUMIPSState *env,
+                            uint32_t fst0, uint32_t fst1)
+{
+    uint32_t wt2;
+
+    wt2 = float32_mul(fst0, fst1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return wt2;
+}
+
+uint64_t helper_float_mul_ps(CPUMIPSState *env,
+                             uint64_t fdt0, uint64_t fdt1)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t wtl2;
+    uint32_t wth2;
+
+    wtl2 = float32_mul(fstl0, fstl1, &env->active_fpu.fp_status);
+    wth2 = float32_mul(fsth0, fsth1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return ((uint64_t)wth2 << 32) | wtl2;
+}
+
 
 /* MIPS specific binary operations */
 uint64_t helper_float_recip2_d(CPUMIPSState *env, uint64_t fdt0, uint64_t fdt2)
-- 
2.20.1

[PATCH 04/12] target/mips: fpu: Demacro DIV.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index 449e945166..2759c9989d 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1208,7 +1208,6 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,           \
     return ((uint64_t)wth2 << 32) | wt2;                           \
 }
 
-FLOAT_BINOP(div)
 #undef FLOAT_BINOP
 
 uint64_t helper_float_add_d(CPUMIPSState *env,
@@ -1319,6 +1318,42 @@ uint64_t helper_float_mul_ps(CPUMIPSState *env,
     return ((uint64_t)wth2 << 32) | wtl2;
 }
 
+uint64_t helper_float_div_d(CPUMIPSState *env,
+                            uint64_t fdt0, uint64_t fdt1)
+{
+    uint64_t dt2;
+
+    dt2 = float64_div(fdt0, fdt1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return dt2;
+}
+
+uint32_t helper_float_div_s(CPUMIPSState *env,
+                            uint32_t fst0, uint32_t fst1)
+{
+    uint32_t wt2;
+
+    wt2 = float32_div(fst0, fst1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return wt2;
+}
+
+uint64_t helper_float_div_ps(CPUMIPSState *env,
+                             uint64_t fdt0, uint64_t fdt1)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t wtl2;
+    uint32_t wth2;
+
+    wtl2 = float32_div(fstl0, fstl1, &env->active_fpu.fp_status);
+    wth2 = float32_div(fsth0, fsth1, &env->active_fpu.fp_status);
+    update_fcr31(env, GETPC());
+    return ((uint64_t)wth2 << 32) | wtl2;
+}
+
 
 /* MIPS specific binary operations */
 uint64_t helper_float_recip2_d(CPUMIPSState *env, uint64_t fdt0, uint64_t fdt2)
-- 
2.20.1

[PATCH 05/12] target/mips: fpu: Remove now unused macro FLOAT_BINOP

[Aleksandar Markovic]

After demacroing <ADD|SUB|MUL|DIV>.<D|S|PS>, this macro is not
needed anymore.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 39 ---------------------------------------
 1 file changed, 39 deletions(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index 2759c9989d..a3a39681f8 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1170,45 +1170,6 @@ FLOAT_CLASS(class_d, 64)
 #undef FLOAT_CLASS
 
 /* binary operations */
-#define FLOAT_BINOP(name)                                          \
-uint64_t helper_float_ ## name ## _d(CPUMIPSState *env,            \
-                                     uint64_t fdt0, uint64_t fdt1) \
-{                                                                  \
-    uint64_t dt2;                                                  \
-                                                                   \
-    dt2 = float64_ ## name(fdt0, fdt1, &env->active_fpu.fp_status);\
-    update_fcr31(env, GETPC());                                    \
-    return dt2;                                                    \
-}                                                                  \
-                                                                   \
-uint32_t helper_float_ ## name ## _s(CPUMIPSState *env,            \
-                                     uint32_t fst0, uint32_t fst1) \
-{                                                                  \
-    uint32_t wt2;                                                  \
-                                                                   \
-    wt2 = float32_ ## name(fst0, fst1, &env->active_fpu.fp_status);\
-    update_fcr31(env, GETPC());                                    \
-    return wt2;                                                    \
-}                                                                  \
-                                                                   \
-uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,           \
-                                      uint64_t fdt0,               \
-                                      uint64_t fdt1)               \
-{                                                                  \
-    uint32_t fst0 = fdt0 & 0XFFFFFFFF;                             \
-    uint32_t fsth0 = fdt0 >> 32;                                   \
-    uint32_t fst1 = fdt1 & 0XFFFFFFFF;                             \
-    uint32_t fsth1 = fdt1 >> 32;                                   \
-    uint32_t wt2;                                                  \
-    uint32_t wth2;                                                 \
-                                                                   \
-    wt2 = float32_ ## name(fst0, fst1, &env->active_fpu.fp_status);     \
-    wth2 = float32_ ## name(fsth0, fsth1, &env->active_fpu.fp_status);  \
-    update_fcr31(env, GETPC());                                    \
-    return ((uint64_t)wth2 << 32) | wt2;                           \
-}
-
-#undef FLOAT_BINOP
 
 uint64_t helper_float_add_d(CPUMIPSState *env,
                             uint64_t fdt0, uint64_t fdt1)
-- 
2.20.1

[PATCH 06/12] target/mips: fpu: Demacro MADD.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 41 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index a3a39681f8..c070081cbc 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1495,12 +1495,51 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,             \
     update_fcr31(env, GETPC());                                      \
     return ((uint64_t)fsth0 << 32) | fst0;                           \
 }
-FLOAT_FMA(madd, 0)
 FLOAT_FMA(msub, float_muladd_negate_c)
 FLOAT_FMA(nmadd, float_muladd_negate_result)
 FLOAT_FMA(nmsub, float_muladd_negate_result | float_muladd_negate_c)
 #undef FLOAT_FMA
 
+uint64_t helper_float_madd_d(CPUMIPSState *env, uint64_t fst0,
+                             uint64_t fst1, uint64_t fst2)
+{
+    fst0 = float64_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float64_add(fst0, fst2, &env->active_fpu.fp_status);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint32_t helper_float_madd_s(CPUMIPSState *env, uint32_t fst0,
+                             uint32_t fst1, uint32_t fst2)
+{
+    fst0 = float32_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float32_add(fst0, fst2, &env->active_fpu.fp_status);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint64_t helper_float_madd_ps(CPUMIPSState *env, uint64_t fdt0,
+                              uint64_t fdt1, uint64_t fdt2)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t fstl2 = fdt2 & 0XFFFFFFFF;
+    uint32_t fsth2 = fdt2 >> 32;
+
+    fstl0 = float32_mul(fstl0, fstl1, &env->active_fpu.fp_status);
+    fstl0 = float32_add(fstl0, fstl2, &env->active_fpu.fp_status);
+    fsth0 = float32_mul(fsth0, fsth1, &env->active_fpu.fp_status);
+    fsth0 = float32_add(fsth0, fsth2, &env->active_fpu.fp_status);
+
+    update_fcr31(env, GETPC());
+    return ((uint64_t)fsth0 << 32) | fstl0;
+}
+
+
 #define FLOAT_FMADDSUB(name, bits, muladd_arg)                          \
 uint ## bits ## _t helper_float_ ## name(CPUMIPSState *env,             \
                                          uint ## bits ## _t fs,         \
-- 
2.20.1

[PATCH 07/12] target/mips: fpu: Demacro MSUB.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index c070081cbc..e37fc4075d 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1495,7 +1495,6 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,             \
     update_fcr31(env, GETPC());                                      \
     return ((uint64_t)fsth0 << 32) | fst0;                           \
 }
-FLOAT_FMA(msub, float_muladd_negate_c)
 FLOAT_FMA(nmadd, float_muladd_negate_result)
 FLOAT_FMA(nmsub, float_muladd_negate_result | float_muladd_negate_c)
 #undef FLOAT_FMA
@@ -1539,6 +1538,45 @@ uint64_t helper_float_madd_ps(CPUMIPSState *env, uint64_t fdt0,
     return ((uint64_t)fsth0 << 32) | fstl0;
 }
 
+uint64_t helper_float_msub_d(CPUMIPSState *env, uint64_t fst0,
+                             uint64_t fst1, uint64_t fst2)
+{
+    fst0 = float64_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float64_sub(fst0, fst2, &env->active_fpu.fp_status);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint32_t helper_float_msub_s(CPUMIPSState *env, uint32_t fst0,
+                             uint32_t fst1, uint32_t fst2)
+{
+    fst0 = float32_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float32_sub(fst0, fst2, &env->active_fpu.fp_status);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint64_t helper_float_msub_ps(CPUMIPSState *env, uint64_t fdt0,
+                              uint64_t fdt1, uint64_t fdt2)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t fstl2 = fdt2 & 0XFFFFFFFF;
+    uint32_t fsth2 = fdt2 >> 32;
+
+    fstl0 = float32_mul(fstl0, fstl1, &env->active_fpu.fp_status);
+    fstl0 = float32_sub(fstl0, fstl2, &env->active_fpu.fp_status);
+    fsth0 = float32_mul(fsth0, fsth1, &env->active_fpu.fp_status);
+    fsth0 = float32_sub(fsth0, fsth2, &env->active_fpu.fp_status);
+
+    update_fcr31(env, GETPC());
+    return ((uint64_t)fsth0 << 32) | fstl0;
+}
+
 
 #define FLOAT_FMADDSUB(name, bits, muladd_arg)                          \
 uint ## bits ## _t helper_float_ ## name(CPUMIPSState *env,             \
-- 
2.20.1

[PATCH 08/12] target/mips: fpu: Demacro NMADD.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 44 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index e37fc4075d..d4c065f281 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1495,7 +1495,6 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,             \
     update_fcr31(env, GETPC());                                      \
     return ((uint64_t)fsth0 << 32) | fst0;                           \
 }
-FLOAT_FMA(nmadd, float_muladd_negate_result)
 FLOAT_FMA(nmsub, float_muladd_negate_result | float_muladd_negate_c)
 #undef FLOAT_FMA
 
@@ -1577,6 +1576,49 @@ uint64_t helper_float_msub_ps(CPUMIPSState *env, uint64_t fdt0,
     return ((uint64_t)fsth0 << 32) | fstl0;
 }
 
+uint64_t helper_float_nmadd_d(CPUMIPSState *env, uint64_t fst0,
+                             uint64_t fst1, uint64_t fst2)
+{
+    fst0 = float64_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float64_add(fst0, fst2, &env->active_fpu.fp_status);
+    fst0 = float64_chs(fst0);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint32_t helper_float_nmadd_s(CPUMIPSState *env, uint32_t fst0,
+                             uint32_t fst1, uint32_t fst2)
+{
+    fst0 = float32_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float32_add(fst0, fst2, &env->active_fpu.fp_status);
+    fst0 = float32_chs(fst0);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint64_t helper_float_nmadd_ps(CPUMIPSState *env, uint64_t fdt0,
+                              uint64_t fdt1, uint64_t fdt2)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t fstl2 = fdt2 & 0XFFFFFFFF;
+    uint32_t fsth2 = fdt2 >> 32;
+
+    fstl0 = float32_mul(fstl0, fstl1, &env->active_fpu.fp_status);
+    fstl0 = float32_add(fstl0, fstl2, &env->active_fpu.fp_status);
+    fstl0 = float32_chs(fstl0);
+    fsth0 = float32_mul(fsth0, fsth1, &env->active_fpu.fp_status);
+    fsth0 = float32_add(fsth0, fsth2, &env->active_fpu.fp_status);
+    fsth0 = float32_chs(fsth0);
+
+    update_fcr31(env, GETPC());
+    return ((uint64_t)fsth0 << 32) | fstl0;
+}
+
 
 #define FLOAT_FMADDSUB(name, bits, muladd_arg)                          \
 uint ## bits ## _t helper_float_ ## name(CPUMIPSState *env,             \
-- 
2.20.1

[PATCH 09/12] target/mips: fpu: Demacro NMSUB.<D|S|PS>

[Aleksandar Markovic]

This is just a cosmetic change to enable tools like gcov, gdb,
callgrind, etc. to better display involved source code.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 44 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index d4c065f281..927bac24ac 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1495,7 +1495,6 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,             \
     update_fcr31(env, GETPC());                                      \
     return ((uint64_t)fsth0 << 32) | fst0;                           \
 }
-FLOAT_FMA(nmsub, float_muladd_negate_result | float_muladd_negate_c)
 #undef FLOAT_FMA
 
 uint64_t helper_float_madd_d(CPUMIPSState *env, uint64_t fst0,
@@ -1619,6 +1618,49 @@ uint64_t helper_float_nmadd_ps(CPUMIPSState *env, uint64_t fdt0,
     return ((uint64_t)fsth0 << 32) | fstl0;
 }
 
+uint64_t helper_float_nmsub_d(CPUMIPSState *env, uint64_t fst0,
+                             uint64_t fst1, uint64_t fst2)
+{
+    fst0 = float64_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float64_sub(fst0, fst2, &env->active_fpu.fp_status);
+    fst0 = float64_chs(fst0);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint32_t helper_float_nmsub_s(CPUMIPSState *env, uint32_t fst0,
+                             uint32_t fst1, uint32_t fst2)
+{
+    fst0 = float32_mul(fst0, fst1, &env->active_fpu.fp_status);
+    fst0 = float32_sub(fst0, fst2, &env->active_fpu.fp_status);
+    fst0 = float32_chs(fst0);
+
+    update_fcr31(env, GETPC());
+    return fst0;
+}
+
+uint64_t helper_float_nmsub_ps(CPUMIPSState *env, uint64_t fdt0,
+                              uint64_t fdt1, uint64_t fdt2)
+{
+    uint32_t fstl0 = fdt0 & 0XFFFFFFFF;
+    uint32_t fsth0 = fdt0 >> 32;
+    uint32_t fstl1 = fdt1 & 0XFFFFFFFF;
+    uint32_t fsth1 = fdt1 >> 32;
+    uint32_t fstl2 = fdt2 & 0XFFFFFFFF;
+    uint32_t fsth2 = fdt2 >> 32;
+
+    fstl0 = float32_mul(fstl0, fstl1, &env->active_fpu.fp_status);
+    fstl0 = float32_sub(fstl0, fstl2, &env->active_fpu.fp_status);
+    fstl0 = float32_chs(fstl0);
+    fsth0 = float32_mul(fsth0, fsth1, &env->active_fpu.fp_status);
+    fsth0 = float32_sub(fsth0, fsth2, &env->active_fpu.fp_status);
+    fsth0 = float32_chs(fsth0);
+
+    update_fcr31(env, GETPC());
+    return ((uint64_t)fsth0 << 32) | fstl0;
+}
+
 
 #define FLOAT_FMADDSUB(name, bits, muladd_arg)                          \
 uint ## bits ## _t helper_float_ ## name(CPUMIPSState *env,             \
-- 
2.20.1

[PATCH 10/12] target/mips: fpu: Remove now unused UNFUSED_FMA and FLOAT_FMA macros

[Aleksandar Markovic]

After demacroing <MADD|MSUB|NMADD|NMSUB>.<D|S|PS>, these macros
are not needed anymore.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 50 ----------------------------------------
 1 file changed, 50 deletions(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index 927bac24ac..e8e50e4bc0 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -1446,56 +1446,6 @@ FLOAT_MINMAX(mina_d, 64, minnummag)
 #undef FLOAT_MINMAX
 
 /* ternary operations */
-#define UNFUSED_FMA(prefix, a, b, c, flags)                          \
-{                                                                    \
-    a = prefix##_mul(a, b, &env->active_fpu.fp_status);              \
-    if ((flags) & float_muladd_negate_c) {                           \
-        a = prefix##_sub(a, c, &env->active_fpu.fp_status);          \
-    } else {                                                         \
-        a = prefix##_add(a, c, &env->active_fpu.fp_status);          \
-    }                                                                \
-    if ((flags) & float_muladd_negate_result) {                      \
-        a = prefix##_chs(a);                                         \
-    }                                                                \
-}
-
-/* FMA based operations */
-#define FLOAT_FMA(name, type)                                        \
-uint64_t helper_float_ ## name ## _d(CPUMIPSState *env,              \
-                                     uint64_t fdt0, uint64_t fdt1,   \
-                                     uint64_t fdt2)                  \
-{                                                                    \
-    UNFUSED_FMA(float64, fdt0, fdt1, fdt2, type);                    \
-    update_fcr31(env, GETPC());                                      \
-    return fdt0;                                                     \
-}                                                                    \
-                                                                     \
-uint32_t helper_float_ ## name ## _s(CPUMIPSState *env,              \
-                                     uint32_t fst0, uint32_t fst1,   \
-                                     uint32_t fst2)                  \
-{                                                                    \
-    UNFUSED_FMA(float32, fst0, fst1, fst2, type);                    \
-    update_fcr31(env, GETPC());                                      \
-    return fst0;                                                     \
-}                                                                    \
-                                                                     \
-uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env,             \
-                                      uint64_t fdt0, uint64_t fdt1,  \
-                                      uint64_t fdt2)                 \
-{                                                                    \
-    uint32_t fst0 = fdt0 & 0XFFFFFFFF;                               \
-    uint32_t fsth0 = fdt0 >> 32;                                     \
-    uint32_t fst1 = fdt1 & 0XFFFFFFFF;                               \
-    uint32_t fsth1 = fdt1 >> 32;                                     \
-    uint32_t fst2 = fdt2 & 0XFFFFFFFF;                               \
-    uint32_t fsth2 = fdt2 >> 32;                                     \
-                                                                     \
-    UNFUSED_FMA(float32, fst0, fst1, fst2, type);                    \
-    UNFUSED_FMA(float32, fsth0, fsth1, fsth2, type);                 \
-    update_fcr31(env, GETPC());                                      \
-    return ((uint64_t)fsth0 << 32) | fst0;                           \
-}
-#undef FLOAT_FMA
 
 uint64_t helper_float_madd_d(CPUMIPSState *env, uint64_t fst0,
                              uint64_t fst1, uint64_t fst2)
-- 
2.20.1

[PATCH 11/12] target/mips: fpu: Refactor conversion from ieee to mips exception flags

[Aleksandar Markovic]

The original coversion function is used for regular and MSA floating
point instructions handling. Since there are some nuanced differences
between regular and MSA floatin point excetion handling, provide two
instances of the conversion function, rather than just a common one.
Inline both of these function instances for the sake of performance.
Improve variable naming in surrounding code for clarity.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
---
 target/mips/fpu_helper.c | 55 +++++++++++++++-------------
 target/mips/internal.h   |  1 -
 target/mips/msa_helper.c | 77 +++++++++++++++++++++++++++-------------
 3 files changed, 82 insertions(+), 51 deletions(-)

diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c
index e8e50e4bc0..aefb5291de 100644
--- a/target/mips/fpu_helper.c
+++ b/target/mips/fpu_helper.c
@@ -189,43 +189,48 @@ void helper_ctc1(CPUMIPSState *env, target_ulong arg1, uint32_t fs, uint32_t rt)
     }
 }
 
-int ieee_ex_to_mips(int xcpt)
+static inline int ieee_to_mips_xcpt(int ieee_xcpt)
 {
-    int ret = 0;
-    if (xcpt) {
-        if (xcpt & float_flag_invalid) {
-            ret |= FP_INVALID;
-        }
-        if (xcpt & float_flag_overflow) {
-            ret |= FP_OVERFLOW;
-        }
-        if (xcpt & float_flag_underflow) {
-            ret |= FP_UNDERFLOW;
-        }
-        if (xcpt & float_flag_divbyzero) {
-            ret |= FP_DIV0;
-        }
-        if (xcpt & float_flag_inexact) {
-            ret |= FP_INEXACT;
-        }
+    int mips_xcpt = 0;
+
+    if (ieee_xcpt & float_flag_invalid) {
+        mips_xcpt |= FP_INVALID;
+    }
+    if (ieee_xcpt & float_flag_overflow) {
+        mips_xcpt |= FP_OVERFLOW;
     }
-    return ret;
+    if (ieee_xcpt & float_flag_underflow) {
+        mips_xcpt |= FP_UNDERFLOW;
+    }
+    if (ieee_xcpt & float_flag_divbyzero) {
+        mips_xcpt |= FP_DIV0;
+    }
+    if (ieee_xcpt & float_flag_inexact) {
+        mips_xcpt |= FP_INEXACT;
+    }
+
+    return mips_xcpt;
 }
 
 static inline void update_fcr31(CPUMIPSState *env, uintptr_t pc)
 {
-    int tmp = ieee_ex_to_mips(get_float_exception_flags(
-                                  &env->active_fpu.fp_status));
+    int ieee_exception_flags = get_float_exception_flags(
+                                   &env->active_fpu.fp_status);
+    int mips_exception_flags = 0;
+
+    if (ieee_exception_flags) {
+        mips_exception_flags = ieee_to_mips_xcpt(ieee_exception_flags);
+    }
 
-    SET_FP_CAUSE(env->active_fpu.fcr31, tmp);
+    SET_FP_CAUSE(env->active_fpu.fcr31, mips_exception_flags);
 
-    if (tmp) {
+    if (mips_exception_flags)  {
         set_float_exception_flags(0, &env->active_fpu.fp_status);
 
-        if (GET_FP_ENABLE(env->active_fpu.fcr31) & tmp) {
+        if (GET_FP_ENABLE(env->active_fpu.fcr31) & mips_exception_flags) {
             do_raise_exception(env, EXCP_FPE, pc);
         } else {
-            UPDATE_FP_FLAGS(env->active_fpu.fcr31, tmp);
+            UPDATE_FP_FLAGS(env->active_fpu.fcr31, mips_exception_flags);
         }
     }
 }
diff --git a/target/mips/internal.h b/target/mips/internal.h
index 1bf274b3ef..684356e309 100644
--- a/target/mips/internal.h
+++ b/target/mips/internal.h
@@ -224,7 +224,6 @@ uint32_t float_class_s(uint32_t arg, float_status *fst);
 uint64_t float_class_d(uint64_t arg, float_status *fst);
 
 extern unsigned int ieee_rm[];
-int ieee_ex_to_mips(int xcpt);
 void update_pagemask(CPUMIPSState *env, target_ulong arg1, int32_t *pagemask);
 
 static inline void restore_rounding_mode(CPUMIPSState *env)
diff --git a/target/mips/msa_helper.c b/target/mips/msa_helper.c
index 4065cfe4f7..c520405929 100644
--- a/target/mips/msa_helper.c
+++ b/target/mips/msa_helper.c
@@ -5419,54 +5419,81 @@ static inline void check_msacsr_cause(CPUMIPSState *env, uintptr_t retaddr)
 #define CLEAR_IS_INEXACT   2
 #define RECIPROCAL_INEXACT 4
 
-static inline int update_msacsr(CPUMIPSState *env, int action, int denormal)
+
+static inline int ieee_to_mips_xcpt_msa(int ieee_xcpt)
 {
-    int ieee_ex;
+    int mips_xcpt = 0;
 
-    int c;
+    if (ieee_xcpt & float_flag_invalid) {
+        mips_xcpt |= FP_INVALID;
+    }
+    if (ieee_xcpt & float_flag_overflow) {
+        mips_xcpt |= FP_OVERFLOW;
+    }
+    if (ieee_xcpt & float_flag_underflow) {
+        mips_xcpt |= FP_UNDERFLOW;
+    }
+    if (ieee_xcpt & float_flag_divbyzero) {
+        mips_xcpt |= FP_DIV0;
+    }
+    if (ieee_xcpt & float_flag_inexact) {
+        mips_xcpt |= FP_INEXACT;
+    }
+
+    return mips_xcpt;
+}
+
+static inline int update_msacsr(CPUMIPSState *env, int action, int denormal)
+{
+    int ieee_exception_flags;
+    int mips_exception_flags = 0;
     int cause;
     int enable;
 
-    ieee_ex = get_float_exception_flags(&env->active_tc.msa_fp_status);
+    ieee_exception_flags = get_float_exception_flags(
+                               &env->active_tc.msa_fp_status);
 
     /* QEMU softfloat does not signal all underflow cases */
     if (denormal) {
-        ieee_ex |= float_flag_underflow;
+        ieee_exception_flags |= float_flag_underflow;
+    }
+    if (ieee_exception_flags) {
+        mips_exception_flags = ieee_to_mips_xcpt_msa(ieee_exception_flags);
     }
-
-    c = ieee_ex_to_mips(ieee_ex);
     enable = GET_FP_ENABLE(env->active_tc.msacsr) | FP_UNIMPLEMENTED;
 
     /* Set Inexact (I) when flushing inputs to zero */
-    if ((ieee_ex & float_flag_input_denormal) &&
+    if ((ieee_exception_flags & float_flag_input_denormal) &&
             (env->active_tc.msacsr & MSACSR_FS_MASK) != 0) {
         if (action & CLEAR_IS_INEXACT) {
-            c &= ~FP_INEXACT;
+            mips_exception_flags &= ~FP_INEXACT;
         } else {
-            c |=  FP_INEXACT;
+            mips_exception_flags |= FP_INEXACT;
         }
     }
 
     /* Set Inexact (I) and Underflow (U) when flushing outputs to zero */
-    if ((ieee_ex & float_flag_output_denormal) &&
+    if ((ieee_exception_flags & float_flag_output_denormal) &&
             (env->active_tc.msacsr & MSACSR_FS_MASK) != 0) {
-        c |= FP_INEXACT;
+        mips_exception_flags |= FP_INEXACT;
         if (action & CLEAR_FS_UNDERFLOW) {
-            c &= ~FP_UNDERFLOW;
+            mips_exception_flags &= ~FP_UNDERFLOW;
         } else {
-            c |=  FP_UNDERFLOW;
+            mips_exception_flags |= FP_UNDERFLOW;
         }
     }
 
     /* Set Inexact (I) when Overflow (O) is not enabled */
-    if ((c & FP_OVERFLOW) != 0 && (enable & FP_OVERFLOW) == 0) {
-        c |= FP_INEXACT;
+    if ((mips_exception_flags & FP_OVERFLOW) != 0 &&
+           (enable & FP_OVERFLOW) == 0) {
+        mips_exception_flags |= FP_INEXACT;
     }
 
     /* Clear Exact Underflow when Underflow (U) is not enabled */
-    if ((c & FP_UNDERFLOW) != 0 && (enable & FP_UNDERFLOW) == 0 &&
-            (c & FP_INEXACT) == 0) {
-        c &= ~FP_UNDERFLOW;
+    if ((mips_exception_flags & FP_UNDERFLOW) != 0 &&
+           (enable & FP_UNDERFLOW) == 0 &&
+           (mips_exception_flags & FP_INEXACT) == 0) {
+        mips_exception_flags &= ~FP_UNDERFLOW;
     }
 
     /*
@@ -5474,11 +5501,11 @@ static inline int update_msacsr(CPUMIPSState *env, int action, int denormal)
      * divide by zero
      */
     if ((action & RECIPROCAL_INEXACT) &&
-            (c & (FP_INVALID | FP_DIV0)) == 0) {
-        c = FP_INEXACT;
+            (mips_exception_flags & (FP_INVALID | FP_DIV0)) == 0) {
+        mips_exception_flags = FP_INEXACT;
     }
 
-    cause = c & enable;    /* all current enabled exceptions */
+    cause = mips_exception_flags & enable; /* all current enabled exceptions */
 
     if (cause == 0) {
         /*
@@ -5486,7 +5513,7 @@ static inline int update_msacsr(CPUMIPSState *env, int action, int denormal)
          * with all current exceptions
          */
         SET_FP_CAUSE(env->active_tc.msacsr,
-                (GET_FP_CAUSE(env->active_tc.msacsr) | c));
+            (GET_FP_CAUSE(env->active_tc.msacsr) | mips_exception_flags));
     } else {
         /* Current exceptions are enabled */
         if ((env->active_tc.msacsr & MSACSR_NX_MASK) == 0) {
@@ -5495,11 +5522,11 @@ static inline int update_msacsr(CPUMIPSState *env, int action, int denormal)
              * with all enabled exceptions
              */
             SET_FP_CAUSE(env->active_tc.msacsr,
-                    (GET_FP_CAUSE(env->active_tc.msacsr) | c));
+                (GET_FP_CAUSE(env->active_tc.msacsr) | mips_exception_flags));
         }
     }
 
-    return c;
+    return mips_exception_flags;
 }
 
 static inline int get_enabled_exceptions(const CPUMIPSState *env, int c)
-- 
2.20.1

[PATCH 12/12] hw/mips: Convert Malta "ifdef 0"-ed code to comments

[Aleksandar Markovic]

The checkpatch complain about "#ifdef 0". Convert corresponding
dead code to comments. In future, these cases could be converted
to some no-nonsense logging/tracing.

Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
CC: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/mips/mips_malta.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index e4c4de1b4e..f91fa34b06 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -427,10 +427,12 @@ static uint64_t malta_fpga_read(void *opaque, hwaddr addr,
         break;
 
     default:
-#if 0
-        printf("malta_fpga_read: Bad register offset 0x" TARGET_FMT_lx "\n",
-               addr);
-#endif
+/*
+ * Possible logging:
+ *
+ *        printf("malta_fpga_read: Bad register offset 0x" TARGET_FMT_lx "\n",
+ *               addr);
+ */
         break;
     }
     return val;
@@ -515,10 +517,12 @@ static void malta_fpga_write(void *opaque, hwaddr addr,
         break;
 
     default:
-#if 0
-        printf("malta_fpga_write: Bad register offset 0x" TARGET_FMT_lx "\n",
-               addr);
-#endif
+/*
+ * Possible logging:
+ *
+ *        printf("malta_fpga_write: Bad register offset 0x" TARGET_FMT_lx "\n",
+ *               addr);
+ */
         break;
     }
 }
-- 
2.20.1