[PATCH 4/8] target/ppc: Move neg, darn, mod{sw, uw} to decodetree.

[Chinmay Rath <rathc@linux.ibm.com>]

Moving the below instructions to decodetree specification :

	neg[o][.]       	: XO-form
	mod{sw, uw}, darn	: X-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
---
 target/ppc/helper.h                        |  4 +-
 target/ppc/insn32.decode                   |  8 ++++
 target/ppc/int_helper.c                    |  4 +-
 target/ppc/translate.c                     | 56 ----------------------
 target/ppc/translate/fixedpoint-impl.c.inc | 44 +++++++++++++++++
 5 files changed, 56 insertions(+), 60 deletions(-)

diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 1fc8b7c5fd..09d0b0074b 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -71,8 +71,8 @@ DEF_HELPER_FLAGS_2(cmpeqb, TCG_CALL_NO_RWG_SE, i32, tl, tl)
 DEF_HELPER_FLAGS_1(popcntw, TCG_CALL_NO_RWG_SE, tl, tl)
 DEF_HELPER_FLAGS_2(bpermd, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_3(srad, tl, env, tl, tl)
-DEF_HELPER_FLAGS_0(darn32, TCG_CALL_NO_RWG, tl)
-DEF_HELPER_FLAGS_0(darn64, TCG_CALL_NO_RWG, tl)
+DEF_HELPER_FLAGS_0(DARN32, TCG_CALL_NO_RWG, tl)
+DEF_HELPER_FLAGS_0(DARN64, TCG_CALL_NO_RWG, tl)
 #endif
 
 DEF_HELPER_FLAGS_1(cntlsw32, TCG_CALL_NO_RWG_SE, i32, i32)
diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index bfccebd9a7..654f55471b 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -187,6 +187,9 @@
 &X_a            ra
 @X_a            ...... ra:3 .. ..... ..... .......... .         &X_a
 
+&X_tl           rt l
+@X_tl           ...... rt:5 ... l:2 ..... .......... .          &X_tl
+
 &XO             rt ra rb oe:bool rc:bool
 @XO             ...... rt:5 ra:5 rb:5 oe:1 ......... rc:1       &XO
 
@@ -367,6 +370,11 @@ DIVWU           011111 ..... ..... ..... . 111001011 .  @XO
 DIVWE           011111 ..... ..... ..... . 110101011 .  @XO
 DIVWEU          011111 ..... ..... ..... . 110001011 .  @XO
 
+MODSW           011111 ..... ..... ..... 1100001011 -   @X
+MODUW           011111 ..... ..... ..... 0100001011 -   @X
+DARN            011111 ..... --- .. ----- 1011110011 -  @X_tl
+NEG             011111 ..... ..... ----- . 001101000 .  @XO_ta
+
 ## Fixed-Point Logical Instructions
 
 CFUGED          011111 ..... ..... ..... 0011011100 -   @X
diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index dc1f72ff38..bc25d5b062 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -171,7 +171,7 @@ uint32_t helper_cmpeqb(target_ulong ra, target_ulong rb)
 /*
  * Return a random number.
  */
-uint64_t helper_darn32(void)
+uint64_t helper_DARN32(void)
 {
     Error *err = NULL;
     uint32_t ret;
@@ -186,7 +186,7 @@ uint64_t helper_darn32(void)
     return ret;
 }
 
-uint64_t helper_darn64(void)
+uint64_t helper_DARN64(void)
 {
     Error *err = NULL;
     uint64_t ret;
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 0a1d1d63b3..436fcfc645 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -1878,17 +1878,6 @@ static inline void gen_op_arith_modw(DisasContext *ctx, TCGv ret, TCGv arg1,
     }
 }
 
-#define GEN_INT_ARITH_MODW(name, opc3, sign)                                \
-static void glue(gen_, name)(DisasContext *ctx)                             \
-{                                                                           \
-    gen_op_arith_modw(ctx, cpu_gpr[rD(ctx->opcode)],                        \
-                      cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],   \
-                      sign);                                                \
-}
-
-GEN_INT_ARITH_MODW(moduw, 0x08, 0);
-GEN_INT_ARITH_MODW(modsw, 0x18, 1);
-
 #if defined(TARGET_PPC64)
 static inline void gen_op_arith_modd(DisasContext *ctx, TCGv ret, TCGv arg1,
                                      TCGv arg2, int sign)
@@ -2055,27 +2044,6 @@ static inline void gen_op_arith_subf(DisasContext *ctx, TCGv ret, TCGv arg1,
     }
 }
 
-/* neg neg. nego nego. */
-static inline void gen_op_arith_neg(DisasContext *ctx, bool compute_ov)
-{
-    TCGv zero = tcg_constant_tl(0);
-    gen_op_arith_subf(ctx, cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
-                      zero, 0, 0, compute_ov, Rc(ctx->opcode));
-}
-
-static void gen_neg(DisasContext *ctx)
-{
-    tcg_gen_neg_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)]);
-    if (unlikely(Rc(ctx->opcode))) {
-        gen_set_Rc0(ctx, cpu_gpr[rD(ctx->opcode)]);
-    }
-}
-
-static void gen_nego(DisasContext *ctx)
-{
-    gen_op_arith_neg(ctx, 1);
-}
-
 /***                            Integer logical                            ***/
 #define GEN_LOGICAL2(name, tcg_op, opc, type)                                 \
 static void glue(gen_, name)(DisasContext *ctx)                               \
@@ -2401,24 +2369,6 @@ static void gen_cnttzd(DisasContext *ctx)
         gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
     }
 }
-
-/* darn */
-static void gen_darn(DisasContext *ctx)
-{
-    int l = L(ctx->opcode);
-
-    if (l > 2) {
-        tcg_gen_movi_i64(cpu_gpr[rD(ctx->opcode)], -1);
-    } else {
-        translator_io_start(&ctx->base);
-        if (l == 0) {
-            gen_helper_darn32(cpu_gpr[rD(ctx->opcode)]);
-        } else {
-            /* Return 64-bit random for both CRN and RRN */
-            gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]);
-        }
-    }
-}
 #endif
 
 /***                             Integer rotate                            ***/
@@ -6330,8 +6280,6 @@ GEN_HANDLER(isel, 0x1F, 0x0F, 0xFF, 0x00000001, PPC_ISEL),
 #if defined(TARGET_PPC64)
 GEN_HANDLER(mulld, 0x1F, 0x09, 0x07, 0x00000000, PPC_64B),
 #endif
-GEN_HANDLER(neg, 0x1F, 0x08, 0x03, 0x0000F800, PPC_INTEGER),
-GEN_HANDLER(nego, 0x1F, 0x08, 0x13, 0x0000F800, PPC_INTEGER),
 GEN_HANDLER2(andi_, "andi.", 0x1C, 0xFF, 0xFF, 0x00000000, PPC_INTEGER),
 GEN_HANDLER2(andis_, "andis.", 0x1D, 0xFF, 0xFF, 0x00000000, PPC_INTEGER),
 GEN_HANDLER(cntlzw, 0x1F, 0x1A, 0x00, 0x00000000, PPC_INTEGER),
@@ -6352,7 +6300,6 @@ GEN_HANDLER_E(prtyw, 0x1F, 0x1A, 0x04, 0x0000F801, PPC_NONE, PPC2_ISA205),
 GEN_HANDLER(popcntd, 0x1F, 0x1A, 0x0F, 0x0000F801, PPC_POPCNTWD),
 GEN_HANDLER(cntlzd, 0x1F, 0x1A, 0x01, 0x00000000, PPC_64B),
 GEN_HANDLER_E(cnttzd, 0x1F, 0x1A, 0x11, 0x00000000, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER_E(darn, 0x1F, 0x13, 0x17, 0x001CF801, PPC_NONE, PPC2_ISA300),
 GEN_HANDLER_E(prtyd, 0x1F, 0x1A, 0x05, 0x0000F801, PPC_NONE, PPC2_ISA205),
 GEN_HANDLER_E(bpermd, 0x1F, 0x1C, 0x07, 0x00000001, PPC_NONE, PPC2_PERM_ISA206),
 #endif
@@ -6542,9 +6489,6 @@ GEN_HANDLER_E(maddhd_maddhdu, 0x04, 0x18, 0xFF, 0x00000000, PPC_NONE,
 GEN_HANDLER_E(maddld, 0x04, 0x19, 0xFF, 0x00000000, PPC_NONE, PPC2_ISA300),
 #endif
 
-GEN_HANDLER_E(modsw, 0x1F, 0x0B, 0x18, 0x00000001, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER_E(moduw, 0x1F, 0x0B, 0x08, 0x00000001, PPC_NONE, PPC2_ISA300),
-
 #if defined(TARGET_PPC64)
 #undef GEN_INT_ARITH_DIVD
 #define GEN_INT_ARITH_DIVD(name, opc3, sign, compute_ov)                      \
diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/translate/fixedpoint-impl.c.inc
index 3f787bbeaa..2dfd6bea57 100644
--- a/target/ppc/translate/fixedpoint-impl.c.inc
+++ b/target/ppc/translate/fixedpoint-impl.c.inc
@@ -490,6 +490,50 @@ TRANS(DIVWU, do_divw, 0);
 TRANS(DIVWE, do_divwe, gen_helper_DIVWE);
 TRANS(DIVWEU, do_divwe, gen_helper_DIVWEU);
 
+static bool do_modw(DisasContext *ctx, arg_X *a, bool sign)
+{
+    REQUIRE_INSNS_FLAGS2(ctx, ISA300);
+    gen_op_arith_modw(ctx, cpu_gpr[a->rt], cpu_gpr[a->ra], cpu_gpr[a->rb],
+                      sign);
+    return true;
+}
+
+TRANS(MODUW, do_modw, false);
+TRANS(MODSW, do_modw, true);
+
+static bool trans_NEG(DisasContext *ctx, arg_NEG *a)
+{
+    if (a->oe) {
+        TCGv zero = tcg_constant_tl(0);
+        gen_op_arith_subf(ctx, cpu_gpr[a->rt], cpu_gpr[a->ra], zero,
+                          false, false, true, a->rc);
+    } else {
+        tcg_gen_neg_tl(cpu_gpr[a->rt], cpu_gpr[a->ra]);
+        if (unlikely(a->rc)) {
+            gen_set_Rc0(ctx, cpu_gpr[a->rt]);
+        }
+    }
+    return true;
+}
+
+static bool trans_DARN(DisasContext *ctx, arg_DARN *a)
+{
+    REQUIRE_64BIT(ctx);
+    REQUIRE_INSNS_FLAGS2(ctx, ISA300);
+    if (a->l > 2) {
+        tcg_gen_movi_i64(cpu_gpr[a->rt], -1);
+    } else {
+        translator_io_start(&ctx->base);
+        if (a->l == 0) {
+            gen_helper_DARN32(cpu_gpr[a->rt]);
+        } else {
+            /* Return 64-bit random for both CRN and RRN */
+            gen_helper_DARN64(cpu_gpr[a->rt]);
+        }
+    }
+    return true;
+}
+
 static bool trans_INVALID(DisasContext *ctx, arg_INVALID *a)
 {
     gen_invalid(ctx);
-- 
2.39.3