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Fix PR8790, another instance where unreachable code can cause instruction simplification to fail,

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this case involve a select that simplifies to itself.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121817 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2010-12-15 00:55:35 +00:00
parent 93f83deba1
commit 86e8a700f5
2 changed files with 23 additions and 1 deletions
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7
lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
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@@ -73,7 +73,12 @@ bool CorrelatedValuePropagation::processSelect(SelectInst *S) {
ConstantInt *CI = dyn_cast<ConstantInt>(C);
if (!CI) return false;
S->replaceAllUsesWith(S->getOperand(CI->isOne() ? 1 : 2));
Value *ReplaceWith = S->getOperand(1);
Value *Other = S->getOperand(2);
if (!CI->isOne()) std::swap(ReplaceWith, Other);
if (ReplaceWith == S) ReplaceWith = UndefValue::get(S->getType());
S->replaceAllUsesWith(ReplaceWith);
S->eraseFromParent();
++NumSelects;