ShuriZma
/
xemu
mirror of https://github.com/xemu-project/xemu.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

target-sh4: optimize swap.w 

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>
This commit is contained in:
Aurelien Jarno 2012-09-16 13:12:20 +02:00
parent f16640f47b
commit c53b36d210
1 changed files with 1 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
target-sh4/translate.c
View File

@ -732,17 +732,7 @@ static void _decode_opc(DisasContext * ctx)
} }
return; return;
case 0x6009: /* swap.w Rm,Rn */ case 0x6009: /* swap.w Rm,Rn */
{ tcg_gen_rotli_i32(REG(B11_8), REG(B7_4), 16);
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);
}
return; return;
case 0x200d: /* xtrct Rm,Rn */ case 0x200d: /* xtrct Rm,Rn */
{ {