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Fix PR3874 by restoring a condition I removed, but making it more

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precise than it used to be.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67662 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-03-25 00:28:58 +00:00
parent 86bda4174a
commit e8e4921967
2 changed files with 11 additions and 1 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -6582,7 +6582,8 @@ Instruction *InstCombiner::visitICmpInstWithInstAndIntCst(ICmpInst &ICI,
// preferable because it allows the C<<Y expression to be hoisted out
// of a loop if Y is invariant and X is not.
if (Shift && Shift->hasOneUse() && RHSV == 0 &&
ICI.isEquality() && !Shift->isArithmeticShift()) {
ICI.isEquality() && !Shift->isArithmeticShift() &&
!isa<Constant>(Shift->getOperand(0))) {
// Compute C << Y.
Value *NS;
if (Shift->getOpcode() == Instruction::LShr) {