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Add more FOLD rules for shift + BAND simplifications.

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Mike Pall 2011-10-25 21:16:27 +02:00
parent 17cb366fc9
commit 455917fa0a
1 changed files with 30 additions and 0 deletions
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30
src/lj_opt_fold.c
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@ -1402,6 +1402,36 @@ LJFOLDF(simplify_shift2_ki)
return NEXTFOLD;
}
LJFOLD(BSHL BAND KINT)
LJFOLD(BSHR BAND KINT)
LJFOLD(BROL BAND KINT)
LJFOLD(BROR BAND KINT)
LJFOLDF(simplify_shiftk_andk)
{
IRIns *irk = IR(fleft->op2);
PHIBARRIER(fleft);
if (irk->o == IR_KINT) { /* (i & k1) o k2 ==> (i o k2) & (k1 o k2) */
int32_t k = kfold_intop(irk->i, fright->i, (IROp)fins->o);
fins->op1 = fleft->op1;
fins->op1 = (IRRef1)lj_opt_fold(J);
fins->op2 = (IRRef1)lj_ir_kint(J, k);
fins->ot = IRTI(IR_BAND);
return RETRYFOLD;
}
return NEXTFOLD;
}
LJFOLD(BAND BSHL KINT)
LJFOLD(BAND BSHR KINT)
LJFOLDF(simplify_andk_shiftk)
{
IRIns *irk = IR(fleft->op2);
if (irk->o == IR_KINT &&
kfold_intop(-1, irk->i, (IROp)fleft->o) == fright->i)
return LEFTFOLD; /* (i o k1) & k2 ==> i, if (-1 o k1) == k2 */
return NEXTFOLD;
}
/* -- Reassociation ------------------------------------------------------- */
LJFOLD(ADD ADD KINT)