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do not try to analyze bitcasts from i64 to <2 x i32> in ComputedMaskedBits. While

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we could do this, doing so requires adjusting the demanded mask and the code isn't 
doing that yet.  This fixes PR4495


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74699 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-07-02 16:04:08 +00:00
parent 62c762f329
commit 0dabb0b177
2 changed files with 19 additions and 1 deletions
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5
lib/Analysis/ValueTracking.cpp
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@@ -249,7 +249,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
}
case Instruction::BitCast: {
const Type *SrcTy = I->getOperand(0)->getType();
if (SrcTy->isInteger() || isa<PointerType>(SrcTy)) {
if ((SrcTy->isInteger() || isa<PointerType>(SrcTy)) &&
// TODO: For now, not handling conversions like:
// (bitcast i64 %x to <2 x i32>)
!isa<VectorType>(I->getType())) {
ComputeMaskedBits(I->getOperand(0), Mask, KnownZero, KnownOne, TD,
Depth+1);
return;