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Implement ComputeMaskedBits/SimplifyDemandedBits for ISD::TRUNCATE

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28135 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-05-05 22:32:12 +00:00
parent 35c3913328
commit fe8babf689
1 changed files with 18 additions and 0 deletions
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18
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -607,6 +607,16 @@ bool TargetLowering::SimplifyDemandedBits(SDOperand Op, uint64_t DemandedMask,
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
break;
}
case ISD::TRUNCATE: {
if (SimplifyDemandedBits(Op.getOperand(0), DemandedMask,
KnownZero, KnownOne, TLO, Depth+1))
return true;
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
uint64_t OutMask = MVT::getIntVTBitMask(Op.getValueType());
KnownZero &= OutMask;
KnownOne &= OutMask;
break;
}
case ISD::AssertZext: {
MVT::ValueType VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
uint64_t InMask = MVT::getIntVTBitMask(VT);
@ -864,6 +874,14 @@ void TargetLowering::ComputeMaskedBits(SDOperand Op, uint64_t Mask,
KnownZero, KnownOne, Depth+1);
return;
}
case ISD::TRUNCATE: {
ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
uint64_t OutMask = MVT::getIntVTBitMask(Op.getValueType());
KnownZero &= OutMask;
KnownOne &= OutMask;
break;
}
case ISD::AssertZext: {
MVT::ValueType VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
uint64_t InMask = MVT::getIntVTBitMask(VT);