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Clean up some codes in InstCombiner::SimplifyDemandedBits(). 

llvm-svn: 35446
This commit is contained in:
Zhou Sheng 2007-03-29 04:45:55 +00:00
parent 86de3a009d
commit 444af49cc0
1 changed files with 6 additions and 12 deletions
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18
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1135,10 +1135,9 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
uint32_t SrcBitWidth = SrcTy->getBitWidth();
DemandedMask &= SrcTy->getMask().zext(BitWidth);
uint32_t zextBf = SrcTy->getBitWidth();
DemandedMask.trunc(zextBf);
RHSKnownZero.trunc(zextBf);
RHSKnownOne.trunc(zextBf);
DemandedMask.trunc(SrcBitWidth);
RHSKnownZero.trunc(SrcBitWidth);
RHSKnownOne.trunc(SrcBitWidth);
if (SimplifyDemandedBits(I->getOperand(0), DemandedMask,
RHSKnownZero, RHSKnownOne, Depth+1))
return true;
@ -1168,10 +1167,9 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
if ((NewBits & DemandedMask) != 0)
InputDemandedBits |= InSignBit;
uint32_t sextBf = SrcTy->getBitWidth();
InputDemandedBits.trunc(sextBf);
RHSKnownZero.trunc(sextBf);
RHSKnownOne.trunc(sextBf);
InputDemandedBits.trunc(SrcBitWidth);
RHSKnownZero.trunc(SrcBitWidth);
RHSKnownOne.trunc(SrcBitWidth);
if (SimplifyDemandedBits(I->getOperand(0), InputDemandedBits,
RHSKnownZero, RHSKnownOne, Depth+1))
return true;
@ -1193,10 +1191,6 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
return UpdateValueUsesWith(I, NewCast);
} else if (RHSKnownOne[SrcBitWidth-1]) { // Input sign bit known set
RHSKnownOne |= NewBits;
RHSKnownZero &= ~NewBits;
} else { // Input sign bit unknown
RHSKnownZero &= ~NewBits;
RHSKnownOne &= ~NewBits;
}
break;
}