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PGO: create metadata for switch only if it has more than one targets.

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When all cases of a switch statement are dead, the weights vector only has one
element, and we will get an ssertion failure when calling createBranchWeights.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165759 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren 2012-10-11 22:28:34 +00:00
parent aa79721fce
commit d61d1eb165
1 changed files with 1 additions and 1 deletions
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2
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -695,7 +695,7 @@ SimplifyEqualityComparisonWithOnlyPredecessor(TerminatorInst *TI,
SI->removeCase(i); SI->removeCase(i);
} }
} }
if (HasWeight) if (HasWeight && Weights.size() >= 2)
SI->setMetadata(LLVMContext::MD_prof, SI->setMetadata(LLVMContext::MD_prof,
MDBuilder(SI->getParent()->getContext()). MDBuilder(SI->getParent()->getContext()).
createBranchWeights(Weights)); createBranchWeights(Weights));