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target-alpha: Special case cmpbge with zero

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Knowing the comparator is zero leads to a simpler operation.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-08-05 11:04:11 -07:00
parent 5f2a80adc6
commit 112e4518f0
3 changed files with 21 additions and 1 deletions
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7
target-alpha/translate.c
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@ -1507,7 +1507,12 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
break;
case 0x0F:
/* CMPBGE */
gen_helper_cmpbge(vc, va, vb);
if (ra == 31) {
/* Special case 0 >= X as X == 0. */
gen_helper_cmpbe0(vc, vb);
} else {
gen_helper_cmpbge(vc, va, vb);
}
break;
case 0x12:
/* S8ADDL */