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target-sh4: optimize swap.w

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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
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12
target-sh4/translate.c
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@ -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 */
{