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x86/x64 backend: keep invariants on the right rather than fusing loads.

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This commit is contained in:
Mike Pall 2010-12-09 16:08:55 +01:00
parent 4f0d3e8262
commit e9cab5a763
1 changed files with 6 additions and 3 deletions
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9
src/lj_asm.c
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@ -2483,9 +2483,12 @@ static int swapops(ASMState *as, IRIns *ir)
return 1; /* Swap if left already has a register. */
if (ra_samehint(ir->r, irr->r))
return 1; /* Swap if dest and right have matching hints. */
if (ir->op1 < as->loopref && !irt_isphi(irl->t) &&
!(ir->op2 < as->loopref && !irt_isphi(irr->t)))
return 1; /* Swap invariants to the right. */
if (as->curins > as->loopref) { /* In variant part? */
if (ir->op2 < as->loopref && !irt_isphi(irr->t))
return 0; /* Keep invariants on the right. */
if (ir->op1 < as->loopref && !irt_isphi(irl->t))
return 1; /* Swap invariants to the right. */
}
if (opisfusableload(irl->o))
return 1; /* Swap fusable loads to the right. */
return 0; /* Otherwise don't swap. */