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Merge branch 'master' into v2.1

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This commit is contained in:
Mike Pall 2013-11-07 13:30:20 +01:00
commit ffabcc4445
1 changed files with 5 additions and 4 deletions
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9
src/lj_opt_mem.c
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@ -618,16 +618,17 @@ static AliasRet aa_xref(jit_State *J, IRIns *refa, IRIns *xa, IRIns *xb)
basea = IR(refa->op1);
ofsa = (LJ_64 && irk->o == IR_KINT64) ? (ptrdiff_t)ir_k64(irk)->u64 :
(ptrdiff_t)irk->i;
if (basea == refb && ofsa != 0)
return ALIAS_NO; /* base+-ofs vs. base. */
}
if (refb->o == IR_ADD && irref_isk(refb->op2)) {
IRIns *irk = IR(refb->op2);
baseb = IR(refb->op1);
ofsb = (LJ_64 && irk->o == IR_KINT64) ? (ptrdiff_t)ir_k64(irk)->u64 :
(ptrdiff_t)irk->i;
if (refa == baseb && ofsb != 0)
return ALIAS_NO; /* base vs. base+-ofs. */
}
/* Treat constified pointers like base vs. base+offset. */
if (basea->o == IR_KPTR && baseb->o == IR_KPTR) {
ofsb += (char *)ir_kptr(baseb) - (char *)ir_kptr(basea);
baseb = basea;
}
/* This implements (very) strict aliasing rules.
** Different types do NOT alias, except for differences in signedness.