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Combine i8/u8 XLOAD with BAND+comparison into test byte mrm, imm8.

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Mike Pall 2011-01-19 02:05:26 +01:00
parent 8407ac0eca
commit d20e53c322
1 changed files with 20 additions and 0 deletions
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20
src/lj_asm.c
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@ -2945,8 +2945,28 @@ static void asm_comp_(ASMState *as, IRIns *ir, int cc)
if (!asm_isk32(as, irl->op2, &imm)) {
left = ra_alloc1(as, irl->op2, allow);
rset_clear(allow, left);
} else { /* Try to Fuse IRT_I8/IRT_U8 loads, too. See below. */
IRIns *irll = IR(irl->op1);
if (opisfusableload((IROp)irll->o) &&
(irt_isi8(irll->t) || irt_isu8(irll->t))) {
IRType1 origt = irll->t; /* Temporarily flip types. */
irll->t.irt = (irll->t.irt & ~IRT_TYPE) | IRT_INT;
as->curins--; /* Skip to BAND to avoid failing in noconflict(). */
right = asm_fuseload(as, irl->op1, RSET_GPR);
as->curins++;
irll->t = origt;
if (right != RID_MRM) goto test_nofuse;
/* Fusion succeeded, emit test byte mrm, imm8. */
asm_guardcc(as, cc);
emit_i8(as, (imm & 0xff));
emit_mrm(as, XO_GROUP3b, XOg_TEST, RID_MRM);
return;
}
}
as->curins--; /* Skip to BAND to avoid failing in noconflict(). */
right = asm_fuseload(as, irl->op1, allow);
as->curins++; /* Undo the above. */
test_nofuse:
asm_guardcc(as, cc);
if (ra_noreg(left)) {
emit_i32(as, imm);