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As Chris suggested, handle the situation if ShAmt larger than BitWidth,

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otherwise, opt might crash.

llvm-svn: 52041
This commit is contained in:
Zhou Sheng 2008-06-06 08:32:05 +00:00
parent fe06a1fd5b
commit 06fc769e52
1 changed files with 1 additions and 1 deletions
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2
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1236,7 +1236,7 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
// If the input sign bit is known to be zero, or if none of the top bits // If the input sign bit is known to be zero, or if none of the top bits
// are demanded, turn this into an unsigned shift right. // are demanded, turn this into an unsigned shift right.
if (BitWidth == ShiftAmt || RHSKnownZero[BitWidth-ShiftAmt-1] || if (BitWidth <= ShiftAmt || RHSKnownZero[BitWidth-ShiftAmt-1] ||
(HighBits & ~DemandedMask) == HighBits) { (HighBits & ~DemandedMask) == HighBits) {
// Perform the logical shift right. // Perform the logical shift right.
Value *NewVal = BinaryOperator::CreateLShr( Value *NewVal = BinaryOperator::CreateLShr(