[Qemu-devel] [PATCH 4/4] target/mips: optimize WSBH, DSBH and DSHD

[Aurelien Jarno]

Use the same mask to avoid having to load two different constants, as
suggested by Richard Henderson.

Signed-off-by: Aurelien Jarno <address@hidden>
---
 target/mips/translate.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/target/mips/translate.c b/target/mips/translate.c
index 3022f349cb..c71eed498c 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -4572,12 +4572,14 @@ static void gen_bshfl (DisasContext *ctx, uint32_t op2, 
int rt, int rd)
     case OPC_WSBH:
         {
             TCGv t1 = tcg_temp_new();
+            TCGv t2 = tcg_const_tl(0x00FF00FF);
 
             tcg_gen_shri_tl(t1, t0, 8);
-            tcg_gen_andi_tl(t1, t1, 0x00FF00FF);
+            tcg_gen_and_tl(t1, t1, t2);
+            tcg_gen_and_tl(t0, t0, t2);
             tcg_gen_shli_tl(t0, t0, 8);
-            tcg_gen_andi_tl(t0, t0, ~0x00FF00FF);
             tcg_gen_or_tl(t0, t0, t1);
+            tcg_temp_free(t2);
             tcg_temp_free(t1);
             tcg_gen_ext32s_tl(cpu_gpr[rd], t0);
         }
@@ -4592,27 +4594,31 @@ static void gen_bshfl (DisasContext *ctx, uint32_t op2, 
int rt, int rd)
     case OPC_DSBH:
         {
             TCGv t1 = tcg_temp_new();
+            TCGv t2 = tcg_const_tl(0x00FF00FF00FF00FFULL);
 
             tcg_gen_shri_tl(t1, t0, 8);
-            tcg_gen_andi_tl(t1, t1, 0x00FF00FF00FF00FFULL);
+            tcg_gen_and_tl(t1, t1, t2);
+            tcg_gen_and_tl(t0, t0, t2);
             tcg_gen_shli_tl(t0, t0, 8);
-            tcg_gen_andi_tl(t0, t0, ~0x00FF00FF00FF00FFULL);
             tcg_gen_or_tl(cpu_gpr[rd], t0, t1);
+            tcg_temp_free(t2);
             tcg_temp_free(t1);
         }
         break;
     case OPC_DSHD:
         {
             TCGv t1 = tcg_temp_new();
+            TCGv t2 = tcg_const_tl(0x0000FFFF0000FFFFULL);
 
             tcg_gen_shri_tl(t1, t0, 16);
-            tcg_gen_andi_tl(t1, t1, 0x0000FFFF0000FFFFULL);
+            tcg_gen_and_tl(t1, t1, t2);
+            tcg_gen_and_tl(t0, t0, t2);
             tcg_gen_shli_tl(t0, t0, 16);
-            tcg_gen_andi_tl(t0, t0, ~0x0000FFFF0000FFFFULL);
             tcg_gen_or_tl(t0, t0, t1);
             tcg_gen_shri_tl(t1, t0, 32);
             tcg_gen_shli_tl(t0, t0, 32);
             tcg_gen_or_tl(cpu_gpr[rd], t0, t1);
+            tcg_temp_free(t2);
             tcg_temp_free(t1);
         }
         break;
-- 
2.11.0