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Fix PR491 and testcase Transforms/DeadStoreElimination/2004-12-28-PartialStore.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19180 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-12-29 04:36:02 +00:00
parent d0137cd0f4
commit da16d8c00b
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -111,7 +111,8 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
if (AliasSet *AS = KillLocs.getAliasSetForPointerIfExists(Ptr, ValSize))
for (AliasSet::iterator ASI = AS->begin(), E = AS->end(); ASI != E; ++ASI)
if (AA.alias(ASI.getPointer(), ASI.getSize(), Ptr, ValSize)
if (ASI.getSize() >= ValSize && // Overwriting all of this store.
AA.alias(ASI.getPointer(), ASI.getSize(), Ptr, ValSize)
== AliasAnalysis::MustAlias) {
// If we found a must alias in the killed set, then this store really
// is dead. Remember that the various operands of the store now have