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Also merge EQ(HREF, niltv) in backend.

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This commit is contained in:
Mike Pall 2010-03-28 06:47:04 +02:00
parent 44756ded7a
commit 1130ade4de
1 changed files with 10 additions and 4 deletions
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14
src/lj_asm.c
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@ -1599,7 +1599,8 @@ static uint32_t ir_khash(IRIns *ir)
static MCode *merge_href_niltv(ASMState *as, IRIns *ir)
{
/* Assumes nothing else generates NE of HREF. */
if (ir[1].o == IR_NE && ir[1].op1 == as->curins) {
if ((ir[1].o == IR_NE || ir[1].o == IR_EQ) && ir[1].op1 == as->curins &&
ra_hasreg(ir->r)) {
if (LJ_64 && *as->mcp != XI_ARITHi)
as->mcp += 7+6;
else
@ -1639,10 +1640,12 @@ static void asm_href(ASMState *as, IRIns *ir)
/* Key not found in chain: jump to exit (if merged with NE) or load niltv. */
l_end = emit_label(as);
if (nilexit)
if (nilexit && ir[1].o == IR_NE) {
emit_jcc(as, CC_E, nilexit); /* XI_JMP is not found by lj_asm_patchexit. */
else
nilexit = NULL;
} else {
emit_loada(as, dest, niltvg(J2G(as->J)));
}
/* Follow hash chain until the end. */
l_loop = emit_sjcc_label(as, CC_NZ);
@ -1651,7 +1654,10 @@ static void asm_href(ASMState *as, IRIns *ir)
l_next = emit_label(as);
/* Type and value comparison. */
emit_sjcc(as, CC_E, l_end);
if (nilexit)
emit_jcc(as, CC_E, nilexit);
else
emit_sjcc(as, CC_E, l_end);
if (irt_isnum(kt)) {
if (isk) {
/* Assumes -0.0 is already canonicalized to +0.0. */