[Qemu-devel] [PULL v2 for-2.8 6/9] target-microblaze: Cleanup dec_mul

[Richard Henderson <rth@twiddle.net>]

Use tcg_gen_mul_tl for muli and mul instructions.
Use tcg_gen_muls2_tl for mulh instruction.
Use tcg_gen_mulu2_tl for mulhu instruction.
Use tcg_gen_mulsu2_tl for mulhsu instruction.

Note that this last fixes a bug, in that mulhsu was
previously treating both operands as signed, instead
of treating rb as unsigned.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1475011433-24456-3-git-send-email-rth@twiddle.net>
---
 target-microblaze/translate.c | 61 +++++++------------------------------------
 1 file changed, 9 insertions(+), 52 deletions(-)

diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
index 5274191..de2090a 100644
--- a/target-microblaze/translate.c
+++ b/target-microblaze/translate.c
@@ -581,50 +581,10 @@ static void dec_msr(DisasContext *dc)
     }
 }
 
-/* 64-bit signed mul, lower result in d and upper in d2.  */
-static void t_gen_muls(TCGv d, TCGv d2, TCGv a, TCGv b)
-{
-    TCGv_i64 t0, t1;
-
-    t0 = tcg_temp_new_i64();
-    t1 = tcg_temp_new_i64();
-
-    tcg_gen_ext_i32_i64(t0, a);
-    tcg_gen_ext_i32_i64(t1, b);
-    tcg_gen_mul_i64(t0, t0, t1);
-
-    tcg_gen_extrl_i64_i32(d, t0);
-    tcg_gen_shri_i64(t0, t0, 32);
-    tcg_gen_extrl_i64_i32(d2, t0);
-
-    tcg_temp_free_i64(t0);
-    tcg_temp_free_i64(t1);
-}
-
-/* 64-bit unsigned muls, lower result in d and upper in d2.  */
-static void t_gen_mulu(TCGv d, TCGv d2, TCGv a, TCGv b)
-{
-    TCGv_i64 t0, t1;
-
-    t0 = tcg_temp_new_i64();
-    t1 = tcg_temp_new_i64();
-
-    tcg_gen_extu_i32_i64(t0, a);
-    tcg_gen_extu_i32_i64(t1, b);
-    tcg_gen_mul_i64(t0, t0, t1);
-
-    tcg_gen_extrl_i64_i32(d, t0);
-    tcg_gen_shri_i64(t0, t0, 32);
-    tcg_gen_extrl_i64_i32(d2, t0);
-
-    tcg_temp_free_i64(t0);
-    tcg_temp_free_i64(t1);
-}
-
 /* Multiplier unit.  */
 static void dec_mul(DisasContext *dc)
 {
-    TCGv d[2];
+    TCGv tmp;
     unsigned int subcode;
 
     if ((dc->tb_flags & MSR_EE_FLAG)
@@ -636,13 +596,11 @@ static void dec_mul(DisasContext *dc)
     }
 
     subcode = dc->imm & 3;
-    d[0] = tcg_temp_new();
-    d[1] = tcg_temp_new();
 
     if (dc->type_b) {
         LOG_DIS("muli r%d r%d %x\n", dc->rd, dc->ra, dc->imm);
-        t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
-        goto done;
+        tcg_gen_mul_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
+        return;
     }
 
     /* mulh, mulhsu and mulhu are not available if C_USE_HW_MUL is < 2.  */
@@ -651,30 +609,29 @@ static void dec_mul(DisasContext *dc)
         /* nop??? */
     }
 
+    tmp = tcg_temp_new();
     switch (subcode) {
         case 0:
             LOG_DIS("mul r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
-            t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], cpu_R[dc->rb]);
+            tcg_gen_mul_tl(cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
             break;
         case 1:
             LOG_DIS("mulh r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
-            t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
+            tcg_gen_muls2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
             break;
         case 2:
             LOG_DIS("mulhsu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
-            t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
+            tcg_gen_mulsu2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
             break;
         case 3:
             LOG_DIS("mulhu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
-            t_gen_mulu(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
+            tcg_gen_mulu2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
             break;
         default:
             cpu_abort(CPU(dc->cpu), "unknown MUL insn %x\n", subcode);
             break;
     }
-done:
-    tcg_temp_free(d[0]);
-    tcg_temp_free(d[1]);
+    tcg_temp_free(tmp);
 }
 
 /* Div unit.  */
-- 
2.7.4