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PR7750: !CExpr->isNullValue() only properly computes whether CExpr is nonnull

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if CExpr is a ConstantInt.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109773 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2010-07-29 18:03:33 +00:00
parent 2a5892fe66
commit 618898e933
1 changed files with 1 additions and 1 deletions
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2
lib/Transforms/InstCombine/InstCombineCompares.cpp
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@ -1374,7 +1374,7 @@ Instruction *InstCombiner::visitICmpInstWithInstAndIntCst(ICmpInst &ICI,
case Instruction::Or:
// If bits are being or'd in that are not present in the constant we
// are comparing against, then the comparison could never succeed!
if (Constant *BOC = dyn_cast<Constant>(BO->getOperand(1))) {
if (ConstantInt *BOC = dyn_cast<ConstantInt>(BO->getOperand(1))) {
Constant *NotCI = ConstantExpr::getNot(RHS);
if (!ConstantExpr::getAnd(BOC, NotCI)->isNullValue())
return ReplaceInstUsesWith(ICI,