target/ppc: Move divw[u, e, eu] instructions to decodetree.

Moving the following instructions to decodetree specification :
	 divw[u, e, eu][o][.] 	: XO-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.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

target/ppc/helper.h

@@ -55,8 +55,8 @@ DEF_HELPER_5(lscbx, tl, env, tl, i32, i32, 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(DIVWEU, tl, env, tl, tl, i32)
-DEF_HELPER_4(divwe, tl, env, tl, tl, i32)
+DEF_HELPER_4(DIVWE, tl, env, tl, tl, i32)
 
 DEF_HELPER_FLAGS_1(popcntb, TCG_CALL_NO_RWG_SE, tl, tl)
 DEF_HELPER_FLAGS_2(cmpb, TCG_CALL_NO_RWG_SE, tl, tl, tl)

target/ppc/insn32.decode

@@ -371,6 +371,11 @@ MULLWO          011111 ..... ..... ..... 1 011101011 .  @XO_tab_rc
 MULHW           011111 ..... ..... ..... - 001001011 .  @XO_tab_rc
 MULHWU          011111 ..... ..... ..... - 000001011 .  @XO_tab_rc
 
+DIVW            011111 ..... ..... ..... . 111101011 .  @XO
+DIVWU           011111 ..... ..... ..... . 111001011 .  @XO
+DIVWE           011111 ..... ..... ..... . 110101011 .  @XO
+DIVWEU          011111 ..... ..... ..... . 110001011 .  @XO
+
 ## Fixed-Point Logical Instructions
 
 CFUGED          011111 ..... ..... ..... 0011011100 -   @X

target/ppc/int_helper.c

@@ -44,7 +44,7 @@ static inline void helper_update_ov_legacy(CPUPPCState *env, int ov)
     }
 }
 
-target_ulong helper_divweu(CPUPPCState *env, target_ulong ra, target_ulong rb,
+target_ulong helper_DIVWEU(CPUPPCState *env, target_ulong ra, target_ulong rb,
                            uint32_t oe)
 {
     uint64_t rt = 0;
@@ -71,7 +71,7 @@ target_ulong helper_divweu(CPUPPCState *env, target_ulong ra, target_ulong rb,
     return (target_ulong)rt;
 }
 
-target_ulong helper_divwe(CPUPPCState *env, target_ulong ra, target_ulong rb,
+target_ulong helper_DIVWE(CPUPPCState *env, target_ulong ra, target_ulong rb,
                           uint32_t oe)
 {
     int64_t rt = 0;

target/ppc/translate.c

@@ -1777,21 +1777,6 @@ static inline void gen_op_arith_divw(DisasContext *ctx, TCGv ret,
         gen_set_Rc0(ctx, ret);
     }
 }
-/* Div functions */
-#define GEN_INT_ARITH_DIVW(name, opc3, sign, compute_ov)                      \
-static void glue(gen_, name)(DisasContext *ctx)                               \
-{                                                                             \
-    gen_op_arith_divw(ctx, cpu_gpr[rD(ctx->opcode)],                          \
-                     cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],      \
-                     sign, compute_ov, Rc(ctx->opcode));                      \
-}
-/* divwu  divwu.  divwuo  divwuo.   */
-GEN_INT_ARITH_DIVW(divwu, 0x0E, 0, 0);
-GEN_INT_ARITH_DIVW(divwuo, 0x1E, 0, 1);
-/* divw  divw.  divwo  divwo.   */
-GEN_INT_ARITH_DIVW(divw, 0x0F, 1, 0);
-GEN_INT_ARITH_DIVW(divwo, 0x1F, 1, 1);
-
 /* div[wd]eu[o][.] */
 #define GEN_DIVE(name, hlpr, compute_ov)                                      \
 static void gen_##name(DisasContext *ctx)                                     \
@@ -1804,11 +1789,6 @@ static void gen_##name(DisasContext *ctx)                                     \
     }                                                                         \
 }
 
-GEN_DIVE(divweu, divweu, 0);
-GEN_DIVE(divweuo, divweu, 1);
-GEN_DIVE(divwe, divwe, 0);
-GEN_DIVE(divweo, divwe, 1);
-
 #if defined(TARGET_PPC64)
 static inline void gen_op_arith_divd(DisasContext *ctx, TCGv ret, TCGv arg1,
                                      TCGv arg2, int sign, int compute_ov)
@@ -6470,17 +6450,6 @@ GEN_HANDLER_E(maddhd_maddhdu, 0x04, 0x18, 0xFF, 0x00000000, PPC_NONE,
 GEN_HANDLER_E(maddld, 0x04, 0x19, 0xFF, 0x00000000, PPC_NONE, PPC2_ISA300),
 #endif
 
-#undef GEN_INT_ARITH_DIVW
-#define GEN_INT_ARITH_DIVW(name, opc3, sign, compute_ov)                      \
-GEN_HANDLER(name, 0x1F, 0x0B, opc3, 0x00000000, PPC_INTEGER)
-GEN_INT_ARITH_DIVW(divwu, 0x0E, 0, 0),
-GEN_INT_ARITH_DIVW(divwuo, 0x1E, 0, 1),
-GEN_INT_ARITH_DIVW(divw, 0x0F, 1, 0),
-GEN_INT_ARITH_DIVW(divwo, 0x1F, 1, 1),
-GEN_HANDLER_E(divwe, 0x1F, 0x0B, 0x0D, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(divweo, 0x1F, 0x0B, 0x1D, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(divweu, 0x1F, 0x0B, 0x0C, 0, PPC_NONE, PPC2_DIVE_ISA206),
-GEN_HANDLER_E(divweuo, 0x1F, 0x0B, 0x1C, 0, PPC_NONE, PPC2_DIVE_ISA206),
 GEN_HANDLER_E(modsw, 0x1F, 0x0B, 0x18, 0x00000001, PPC_NONE, PPC2_ISA300),
 GEN_HANDLER_E(moduw, 0x1F, 0x0B, 0x08, 0x00000001, PPC_NONE, PPC2_ISA300),
 

target/ppc/translate/fixedpoint-impl.c.inc

@@ -461,6 +461,30 @@ static bool do_mulhw(DisasContext *ctx, arg_XO_tab_rc *a,
 TRANS(MULHW, do_mulhw, tcg_gen_muls2_i32)
 TRANS(MULHWU, do_mulhw, tcg_gen_mulu2_i32)
 
+static bool do_divw(DisasContext *ctx, arg_XO *a, int sign)
+{
+    gen_op_arith_divw(ctx, cpu_gpr[a->rt], cpu_gpr[a->ra], cpu_gpr[a->rb],
+                      sign, a->oe, a->rc);
+    return true;
+}
+
+static bool do_divwe(DisasContext *ctx, arg_XO *a,
+                     void (*helper)(TCGv, TCGv_ptr, TCGv, TCGv, TCGv_i32))
+{
+    REQUIRE_INSNS_FLAGS2(ctx, DIVE_ISA206);
+    helper(cpu_gpr[a->rt], tcg_env, cpu_gpr[a->ra], cpu_gpr[a->rb],
+           tcg_constant_i32(a->oe));
+    if (unlikely(a->rc)) {
+        gen_set_Rc0(ctx, cpu_gpr[a->rt]);
+    }
+    return true;
+}
+
+TRANS(DIVW, do_divw, 1);
+TRANS(DIVWU, do_divw, 0);
+TRANS(DIVWE, do_divwe, gen_helper_DIVWE);
+TRANS(DIVWEU, do_divwe, gen_helper_DIVWEU);
+
 static bool trans_INVALID(DisasContext *ctx, arg_INVALID *a)
 {
     gen_invalid(ctx);