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[Qemu-devel] [PATCH 06/11] target-sh4: optimize swap.w


From: Aurelien Jarno
Subject: [Qemu-devel] [PATCH 06/11] target-sh4: optimize swap.w
Date: Mon, 17 Sep 2012 01:11:55 +0200

It's possible swap the two 16-bit words of a 32-bit register using a
rotation. If the TCG target doesn't implement rotation, the replacement
code is similar to the previously implemented code.

Signed-off-by: Aurelien Jarno <address@hidden>
---
 target-sh4/translate.c |   12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/target-sh4/translate.c b/target-sh4/translate.c
index 92c5a1f..9ecbe47 100644
--- a/target-sh4/translate.c
+++ b/target-sh4/translate.c
@@ -732,17 +732,7 @@ static void _decode_opc(DisasContext * ctx)
        }
        return;
     case 0x6009:               /* swap.w Rm,Rn */
-       {
-           TCGv high, low;
-           high = tcg_temp_new();
-           tcg_gen_shli_i32(high, REG(B7_4), 16);
-           low = tcg_temp_new();
-           tcg_gen_shri_i32(low, REG(B7_4), 16);
-           tcg_gen_ext16u_i32(low, low);
-           tcg_gen_or_i32(REG(B11_8), high, low);
-           tcg_temp_free(low);
-           tcg_temp_free(high);
-       }
+        tcg_gen_rotli_i32(REG(B11_8), REG(B7_4), 16);
        return;
     case 0x200d:               /* xtrct Rm,Rn */
        {
-- 
1.7.10.4




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