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fix crash on Transforms/InstCombine/intrinsics.ll introduced by r89970

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89972 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-26 22:08:06 +00:00
parent 21f83a2f95
commit 998e25a143
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -9877,12 +9877,15 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());
uint32_t BitWidth = IT->getBitWidth();
APInt Mask = APInt::getSignBit(BitWidth);
APInt LHSKnownZero, LHSKnownOne, RHSKnownZero, RHSKnownOne;
APInt LHSKnownZero(BitWidth, 0);
APInt LHSKnownOne(BitWidth, 0);
ComputeMaskedBits(LHS, Mask, LHSKnownZero, LHSKnownOne);
bool LHSKnownNegative = LHSKnownOne[BitWidth - 1];
bool LHSKnownPositive = LHSKnownZero[BitWidth - 1];
if (LHSKnownNegative || LHSKnownPositive) {
APInt RHSKnownZero(BitWidth, 0);
APInt RHSKnownOne(BitWidth, 0);
ComputeMaskedBits(RHS, Mask, RHSKnownZero, RHSKnownOne);
bool RHSKnownNegative = RHSKnownOne[BitWidth - 1];
bool RHSKnownPositive = RHSKnownZero[BitWidth - 1];