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target-sh4: optimize negc using add2 and sub2

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Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2015-05-25 01:28:56 +02:00
parent d0f44a55fa
commit 60eb27fe49
1 changed files with 6 additions and 6 deletions
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12
target-sh4/translate.c
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@ -795,12 +795,12 @@ static void _decode_opc(DisasContext * ctx)
return;
case 0x600a: /* negc Rm,Rn */
{
TCGv t0 = tcg_temp_new();
tcg_gen_neg_i32(t0, REG(B7_4));
tcg_gen_sub_i32(REG(B11_8), t0, cpu_sr_t);
tcg_gen_setcondi_i32(TCG_COND_GTU, cpu_sr_t, t0, 0);
tcg_gen_setcond_i32(TCG_COND_GTU, t0, REG(B11_8), t0);
tcg_gen_or_i32(cpu_sr_t, cpu_sr_t, t0);
TCGv t0 = tcg_const_i32(0);
tcg_gen_add2_i32(REG(B11_8), cpu_sr_t,
REG(B7_4), t0, cpu_sr_t, t0);
tcg_gen_sub2_i32(REG(B11_8), cpu_sr_t,
t0, t0, REG(B11_8), cpu_sr_t);
tcg_gen_andi_i32(cpu_sr_t, cpu_sr_t, 1);
tcg_temp_free(t0);
}
return;