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tcg/i386: optimize and $0xff(ff), reg

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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2009-09-27 19:36:05 +02:00
parent add16157d7
commit b70650cbfe
1 changed files with 6 additions and 0 deletions
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6
tcg/i386/tcg-target.c
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@ -281,6 +281,12 @@ static inline void tgen_arithi(TCGContext *s, int c, int r0, int32_t val)
if (val == (int8_t)val) { if (val == (int8_t)val) {
tcg_out_modrm(s, 0x83, c, r0); tcg_out_modrm(s, 0x83, c, r0);
tcg_out8(s, val); tcg_out8(s, val);
} else if (c == ARITH_AND && val == 0xffu && r0 < 4) {
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT, r0, r0);
} else if (c == ARITH_AND && val == 0xffffu) {
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT, r0, r0);
} else { } else {
tcg_out_modrm(s, 0x81, c, r0); tcg_out_modrm(s, 0x81, c, r0);
tcg_out32(s, val); tcg_out32(s, val);