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MemCmpExpansion::getCompareLoadPairs - assert we find a comparison diff. NFCI. 

Fix scan-build uninitialized warning and assert the final diff isn't null.

llvm-svn: 361095
This commit is contained in:
Simon Pilgrim 2019-05-18 11:31:48 +00:00
parent 63621832da
commit 2b45a70fd6
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/CodeGen/ExpandMemCmp.cpp
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@ -323,7 +323,7 @@ Value *MemCmpExpansion::getCompareLoadPairs(unsigned BlockIndex,
assert(LoadIndex < getNumLoads() && assert(LoadIndex < getNumLoads() &&
"getCompareLoadPairs() called with no remaining loads"); "getCompareLoadPairs() called with no remaining loads");
std::vector<Value *> XorList, OrList; std::vector<Value *> XorList, OrList;
Value *Diff; Value *Diff = nullptr;
const unsigned NumLoads = const unsigned NumLoads =
std::min(getNumLoads() - LoadIndex, NumLoadsPerBlockForZeroCmp); std::min(getNumLoads() - LoadIndex, NumLoadsPerBlockForZeroCmp);
@ -400,6 +400,8 @@ Value *MemCmpExpansion::getCompareLoadPairs(unsigned BlockIndex,
while (OrList.size() != 1) { while (OrList.size() != 1) {
OrList = pairWiseOr(OrList); OrList = pairWiseOr(OrList);
} }
assert(Diff && "Failed to find comparison diff");
Cmp = Builder.CreateICmpNE(OrList[0], ConstantInt::get(Diff->getType(), 0)); Cmp = Builder.CreateICmpNE(OrList[0], ConstantInt::get(Diff->getType(), 0));
} }