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Fix Transforms/InstCombine/2006-03-30-ExtractElement.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-30 22:02:40 +00:00
parent fc542a6466
commit df084ff78b
1 changed files with 7 additions and 3 deletions
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10
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -6704,9 +6704,13 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
if (IE->getOperand(2) == EI.getOperand(1))
return ReplaceInstUsesWith(EI, IE->getOperand(1));
// If the inserted and extracted elements are constants, they must not
// be the same value, replace with the pre-inserted value.
if (isa<Constant>(IE->getOperand(2)) && isa<Constant>(EI.getOperand(1)))
return ReplaceInstUsesWith(EI, IE->getOperand(0));
// be the same value, extract from the pre-inserted value instead.
if (isa<Constant>(IE->getOperand(2)) &&
isa<Constant>(EI.getOperand(1))) {
AddUsesToWorkList(EI);
EI.setOperand(0, IE->getOperand(0));
return &EI;
}
}
}
return 0;