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implement PR8576, deleting dead stores with intervening may-alias stores.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119927 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-11-21 07:34:32 +00:00
parent b7dfb970e6
commit f6f1f062cc
4 changed files with 42 additions and 6 deletions
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lib/Analysis/MemoryDependenceAnalysis.cpp
+2 -2
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@@ -409,9 +409,9 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
if (MemLoc.Ptr) {
// If we can do a pointer scan, make it happen.
bool isLoad = !(MR & AliasAnalysis::Mod);
if (IntrinsicInst *II = dyn_cast<MemoryUseIntrinsic>(QueryInst)) {
if (IntrinsicInst *II = dyn_cast<MemoryUseIntrinsic>(QueryInst))
isLoad |= II->getIntrinsicID() == Intrinsic::lifetime_end;
}
LocalCache = getPointerDependencyFrom(MemLoc, isLoad, ScanPos,
QueryParent);
} else if (isa<CallInst>(QueryInst) || isa<InvokeInst>(QueryInst)) {