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fix ComputeMaskedBits handling of zext/sext/trunc to work with vectors.

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This fixes PR4905


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81174 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-09-08 00:13:52 +00:00
parent cf5128ec01
commit b9a4ddbbcd
2 changed files with 30 additions and 8 deletions
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15
lib/Analysis/ValueTracking.cpp
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@ -232,12 +232,16 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
// FALL THROUGH and handle them the same as zext/trunc.
case Instruction::ZExt:
case Instruction::Trunc: {
const Type *SrcTy = I->getOperand(0)->getType();
unsigned SrcBitWidth;
// Note that we handle pointer operands here because of inttoptr/ptrtoint
// which fall through here.
const Type *SrcTy = I->getOperand(0)->getType();
unsigned SrcBitWidth = TD ?
TD->getTypeSizeInBits(SrcTy) :
SrcTy->getScalarSizeInBits();
if (isa<PointerType>(SrcTy))
SrcBitWidth = TD->getTypeSizeInBits(SrcTy);
else
SrcBitWidth = SrcTy->getScalarSizeInBits();
APInt MaskIn(Mask);
MaskIn.zextOrTrunc(SrcBitWidth);
KnownZero.zextOrTrunc(SrcBitWidth);
@ -265,8 +269,7 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
}
case Instruction::SExt: {
// Compute the bits in the result that are not present in the input.
const IntegerType *SrcTy = cast<IntegerType>(I->getOperand(0)->getType());
unsigned SrcBitWidth = SrcTy->getBitWidth();
unsigned SrcBitWidth = I->getOperand(0)->getType()->getScalarSizeInBits();
APInt MaskIn(Mask);
MaskIn.trunc(SrcBitWidth);