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tcg/i386: Use shift in tcg_out_setcond

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For LT/GE vs zero, shift down the sign bit.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-05 16:07:34 -07:00
parent 96658acafd
commit e91f015b62
1 changed files with 15 additions and 0 deletions
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15
tcg/i386/tcg-target.c.inc
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@ -1578,6 +1578,21 @@ static void tcg_out_setcond(TCGContext *s, int rexw, TCGCond cond,
}
return;
case TCG_COND_GE:
inv = true;
/* fall through */
case TCG_COND_LT:
/* If arg2 is 0, extract the sign bit. */
if (const_arg2 && arg2 == 0) {
tcg_out_mov(s, rexw ? TCG_TYPE_I64 : TCG_TYPE_I32, dest, arg1);
if (inv) {
tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_NOT, dest);
}
tcg_out_shifti(s, SHIFT_SHR + rexw, dest, rexw ? 63 : 31);
return;
}
break;
default:
break;
}