Patchwork [06/11] target-sh4: optimize swap.w

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Submitter Aurelien Jarno
Date Sept. 16, 2012, 11:11 p.m.
Message ID <1347837120-14422-7-git-send-email-aurelien@aurel32.net>
Download mbox | patch
Permalink /patch/184180/
State New
Headers show

Comments

Aurelien Jarno - Sept. 16, 2012, 11:11 p.m.
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 <aurelien@aurel32.net>
---
 target-sh4/translate.c |   12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

Patch

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 */
 	{