[PULL 16/72] target/ppc: Move div/mod fixed-point insns (64 bits operands) to decodetree.

[Nicholas Piggin]

From: Chinmay Rath <rathc@linux.ibm.com>

Moving the below instructions to decodetree specification :

        divd[u, e, eu][o][.]    : XO-form
        mod{sd, ud}             : X-form

With this patch, all the fixed-point arithmetic instructions have been
moved to decodetree.
The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured using the '-d in_asm,op' flag.
Also, remaned do_divwe method in fixedpoint-impl.c.inc to do_dive because it is
now used to divide doubleword operands as well, and not just words.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
[np: 32-bit compile fix]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/helper.h                        |  4 +-
 target/ppc/insn32.decode                   |  8 +++
 target/ppc/int_helper.c                    |  4 +-
 target/ppc/translate.c                     | 63 ++--------------------
 target/ppc/translate/fixedpoint-impl.c.inc | 58 ++++++++++++++++++--
 5 files changed, 70 insertions(+), 67 deletions(-)

diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 5a97429f1e..b5a76f1365 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -52,8 +52,8 @@ DEF_HELPER_FLAGS_2(icbiep, TCG_CALL_NO_WG, void, env, tl)
 DEF_HELPER_5(lscbx, tl, env, tl, i32, i32, i32)
 
 #if defined(TARGET_PPC64)
-DEF_HELPER_4(divdeu, i64, env, i64, i64, i32)
-DEF_HELPER_4(divde, i64, env, i64, i64, i32)
+DEF_HELPER_4(DIVDEU, i64, env, i64, i64, i32)
+DEF_HELPER_4(DIVDE, i64, env, i64, i64, i32)
 #endif
 DEF_HELPER_4(DIVWEU, tl, env, tl, tl, i32)
 DEF_HELPER_4(DIVWE, tl, env, tl, tl, i32)
diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index 46199488f7..c7cb6e7f37 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -393,6 +393,14 @@ MADDLD          000100 ..... ..... ..... ..... 110011   @VA
 MADDHD          000100 ..... ..... ..... ..... 110000   @VA
 MADDHDU         000100 ..... ..... ..... ..... 110001   @VA
 
+DIVD            011111 ..... ..... ..... . 111101001 .  @XO
+DIVDU           011111 ..... ..... ..... . 111001001 .  @XO
+DIVDE           011111 ..... ..... ..... . 110101001 .  @XO
+DIVDEU          011111 ..... ..... ..... . 110001001 .  @XO
+
+MODSD           011111 ..... ..... ..... 1100001001 -   @X
+MODUD           011111 ..... ..... ..... 0100001001 -   @X
+
 ## Fixed-Point Logical Instructions
 
 CFUGED          011111 ..... ..... ..... 0011011100 -   @X
diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index bc25d5b062..585c2b65d3 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -101,7 +101,7 @@ target_ulong helper_DIVWE(CPUPPCState *env, target_ulong 
ra, target_ulong rb,
 
 #if defined(TARGET_PPC64)
 
-uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe)
+uint64_t helper_DIVDEU(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe)
 {
     uint64_t rt = 0;
     int overflow = 0;
@@ -120,7 +120,7 @@ uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, 
uint64_t rb, uint32_t oe)
     return rt;
 }
 
-uint64_t helper_divde(CPUPPCState *env, uint64_t rau, uint64_t rbu, uint32_t 
oe)
+uint64_t helper_DIVDE(CPUPPCState *env, uint64_t rau, uint64_t rbu, uint32_t 
oe)
 {
     uint64_t rt = 0;
     int64_t ra = (int64_t)rau;
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index c76c4c9054..ba7c1fdf43 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -1777,21 +1777,11 @@ static inline void gen_op_arith_divw(DisasContext *ctx, 
TCGv ret,
         gen_set_Rc0(ctx, ret);
     }
 }
-/* div[wd]eu[o][.] */
-#define GEN_DIVE(name, hlpr, compute_ov)                                      \
-static void gen_##name(DisasContext *ctx)                                     \
-{                                                                             \
-    TCGv_i32 t0 = tcg_constant_i32(compute_ov);                               \
-    gen_helper_##hlpr(cpu_gpr[rD(ctx->opcode)], tcg_env,                      \
-                     cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)], t0); \
-    if (unlikely(Rc(ctx->opcode) != 0)) {                                     \
-        gen_set_Rc0(ctx, cpu_gpr[rD(ctx->opcode)]);                           \
-    }                                                                         \
-}
 
 #if defined(TARGET_PPC64)
-static inline void gen_op_arith_divd(DisasContext *ctx, TCGv ret, TCGv arg1,
-                                     TCGv arg2, int sign, int compute_ov)
+static inline void gen_op_arith_divd(DisasContext *ctx, TCGv ret,
+                                     TCGv arg1, TCGv arg2, bool sign,
+                                     bool compute_ov, bool compute_rc0)
 {
     TCGv_i64 t0 = tcg_temp_new_i64();
     TCGv_i64 t1 = tcg_temp_new_i64();
@@ -1827,25 +1817,6 @@ static inline void gen_op_arith_divd(DisasContext *ctx, 
TCGv ret, TCGv arg1,
         gen_set_Rc0(ctx, ret);
     }
 }
-
-#define GEN_INT_ARITH_DIVD(name, opc3, sign, compute_ov)                      \
-static void glue(gen_, name)(DisasContext *ctx)                               \
-{                                                                             \
-    gen_op_arith_divd(ctx, cpu_gpr[rD(ctx->opcode)],                          \
-                      cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],     \
-                      sign, compute_ov);                                      \
-}
-/* divdu  divdu.  divduo  divduo.   */
-GEN_INT_ARITH_DIVD(divdu, 0x0E, 0, 0);
-GEN_INT_ARITH_DIVD(divduo, 0x1E, 0, 1);
-/* divd  divd.  divdo  divdo.   */
-GEN_INT_ARITH_DIVD(divd, 0x0F, 1, 0);
-GEN_INT_ARITH_DIVD(divdo, 0x1F, 1, 1);
-
-GEN_DIVE(divdeu, divdeu, 0);
-GEN_DIVE(divdeuo, divdeu, 1);
-GEN_DIVE(divde, divde, 0);
-GEN_DIVE(divdeo, divde, 1);
 #endif
 
 static inline void gen_op_arith_modw(DisasContext *ctx, TCGv ret, TCGv arg1,
@@ -1904,17 +1875,6 @@ static inline void gen_op_arith_modd(DisasContext *ctx, 
TCGv ret, TCGv arg1,
         tcg_gen_remu_i64(ret, t0, t1);
     }
 }
-
-#define GEN_INT_ARITH_MODD(name, opc3, sign)                            \
-static void glue(gen_, name)(DisasContext *ctx)                           \
-{                                                                         \
-  gen_op_arith_modd(ctx, cpu_gpr[rD(ctx->opcode)],                        \
-                    cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],   \
-                    sign);                                                \
-}
-
-GEN_INT_ARITH_MODD(modud, 0x08, 0);
-GEN_INT_ARITH_MODD(modsd, 0x18, 1);
 #endif
 
 /* Common subf function */
@@ -6303,23 +6263,6 @@ GEN_HANDLER(lvsr, 0x1f, 0x06, 0x01, 0x00000001, 
PPC_ALTIVEC),
 GEN_HANDLER(mfvscr, 0x04, 0x2, 0x18, 0x001ff800, PPC_ALTIVEC),
 GEN_HANDLER(mtvscr, 0x04, 0x2, 0x19, 0x03ff0000, PPC_ALTIVEC),
 
-#if defined(TARGET_PPC64)
-#undef GEN_INT_ARITH_DIVD
-#define GEN_INT_ARITH_DIVD(name, opc3, sign, compute_ov)                      \
-GEN_HANDLER(name, 0x1F, 0x09, opc3, 0x00000000, PPC_64B)
-GEN_INT_ARITH_DIVD(divdu, 0x0E, 0, 0),
-GEN_INT_ARITH_DIVD(divduo, 0x1E, 0, 1),
-GEN_INT_ARITH_DIVD(divd, 0x0F, 1, 0),
-GEN_INT_ARITH_DIVD(divdo, 0x1F, 1, 1),
-
-GEN_HANDLER_E(divdeu, 0x1F, 0x09, 0x0C, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(divdeuo, 0x1F, 0x09, 0x1C, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(divde, 0x1F, 0x09, 0x0D, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(divdeo, 0x1F, 0x09, 0x1D, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(modsd, 0x1F, 0x09, 0x18, 0x00000001, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER_E(modud, 0x1F, 0x09, 0x08, 0x00000001, PPC_NONE, PPC2_ISA300),
-#endif
-
 #undef GEN_LOGICAL1
 #undef GEN_LOGICAL2
 #define GEN_LOGICAL2(name, tcg_op, opc, type)                                 \
diff --git a/target/ppc/translate/fixedpoint-impl.c.inc 
b/target/ppc/translate/fixedpoint-impl.c.inc
index 077c938b30..2ada7473ea 100644
--- a/target/ppc/translate/fixedpoint-impl.c.inc
+++ b/target/ppc/translate/fixedpoint-impl.c.inc
@@ -468,7 +468,7 @@ static bool do_divw(DisasContext *ctx, arg_XO *a, int sign)
     return true;
 }
 
-static bool do_divwe(DisasContext *ctx, arg_XO *a,
+static bool do_dive(DisasContext *ctx, arg_XO *a,
                      void (*helper)(TCGv, TCGv_ptr, TCGv, TCGv, TCGv_i32))
 {
     REQUIRE_INSNS_FLAGS2(ctx, DIVE_ISA206);
@@ -482,8 +482,8 @@ static bool do_divwe(DisasContext *ctx, arg_XO *a,
 
 TRANS(DIVW, do_divw, 1);
 TRANS(DIVWU, do_divw, 0);
-TRANS(DIVWE, do_divwe, gen_helper_DIVWE);
-TRANS(DIVWEU, do_divwe, gen_helper_DIVWEU);
+TRANS(DIVWE, do_dive, gen_helper_DIVWE);
+TRANS(DIVWEU, do_dive, gen_helper_DIVWEU);
 
 static bool do_modw(DisasContext *ctx, arg_X *a, bool sign)
 {
@@ -638,6 +638,58 @@ static bool trans_MADDHDU(DisasContext *ctx, arg_MADDHDU 
*a)
     return true;
 }
 
+static bool do_divd(DisasContext *ctx, arg_XO *a, bool sign)
+{
+    REQUIRE_64BIT(ctx);
+#if defined(TARGET_PPC64)
+    gen_op_arith_divd(ctx, cpu_gpr[a->rt], cpu_gpr[a->ra], cpu_gpr[a->rb],
+                      sign, a->oe, a->rc);
+#else
+    qemu_build_not_reached();
+#endif
+    return true;
+}
+
+static bool do_modd(DisasContext *ctx, arg_X *a, bool sign)
+{
+    REQUIRE_64BIT(ctx);
+    REQUIRE_INSNS_FLAGS2(ctx, ISA300);
+#if defined(TARGET_PPC64)
+    gen_op_arith_modd(ctx, cpu_gpr[a->rt], cpu_gpr[a->ra], cpu_gpr[a->rb],
+                      sign);
+#else
+    qemu_build_not_reached();
+#endif
+    return true;
+}
+
+TRANS64(DIVD, do_divd, true);
+TRANS64(DIVDU, do_divd, false);
+
+static bool trans_DIVDE(DisasContext *ctx, arg_DIVDE *a)
+{
+    REQUIRE_64BIT(ctx);
+#if defined(TARGET_PPC64)
+    return do_dive(ctx, a, gen_helper_DIVDE);
+#else
+    qemu_build_not_reached();
+#endif
+}
+
+static bool trans_DIVDEU(DisasContext *ctx, arg_DIVDEU *a)
+{
+    REQUIRE_64BIT(ctx);
+#if defined(TARGET_PPC64)
+    return do_dive(ctx, a, gen_helper_DIVDEU);
+#else
+    qemu_build_not_reached();
+#endif
+    return true;
+}
+
+TRANS64(MODSD, do_modd, true);
+TRANS64(MODUD, do_modd, false);
+
 static bool trans_INVALID(DisasContext *ctx, arg_INVALID *a)
 {
     gen_invalid(ctx);
-- 
2.43.0