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Teach DeadStoreElimination to eliminate exit-block stores with phi addresses.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156558 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2012-05-10 18:57:38 +00:00
parent fe65d98dad
commit b401e3bd16
4 changed files with 68 additions and 3 deletions
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31
lib/Analysis/ValueTracking.cpp
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@ -1796,6 +1796,37 @@ llvm::GetUnderlyingObject(Value *V, const TargetData *TD, unsigned MaxLookup) {
return V;
}
void
llvm::GetUnderlyingObjects(Value *V,
SmallVectorImpl<Value *> &Objects,
const TargetData *TD,
unsigned MaxLookup) {
SmallPtrSet<Value *, 4> Visited;
SmallVector<Value *, 4> Worklist;
Worklist.push_back(V);
do {
Value *P = Worklist.pop_back_val();
P = GetUnderlyingObject(P, TD, MaxLookup);
if (!Visited.insert(P))
continue;
if (SelectInst *SI = dyn_cast<SelectInst>(P)) {
Worklist.push_back(SI->getTrueValue());
Worklist.push_back(SI->getFalseValue());
continue;
}
if (PHINode *PN = dyn_cast<PHINode>(P)) {
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
Worklist.push_back(PN->getIncomingValue(i));
continue;
}
Objects.push_back(P);
} while (!Worklist.empty());
}
/// onlyUsedByLifetimeMarkers - Return true if the only users of this pointer
/// are lifetime markers.
///