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Fix bug: RLE-Preserve-Volatile.ll

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Volatile loads and stores must not be value numbered


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8398 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-09-08 18:13:58 +00:00
parent 09b47f91bd
commit bd70a31c51
1 changed files with 6 additions and 2 deletions
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8
lib/Analysis/LoadValueNumbering.cpp
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@ -90,6 +90,10 @@ void LoadVN::getEqualNumberNodes(Value *V,
getAnalysis<AliasAnalysis>().getMustAliases(V, RetVals);
if (LoadInst *LI = dyn_cast<LoadInst>(V)) {
// Volatile loads cannot be replaced with the value of other loads.
if (LI->isVolatile())
return getAnalysis<ValueNumbering>().getEqualNumberNodes(V, RetVals);
// If we have a load instruction, find all of the load and store
// instructions that use the same source operand. We implement this
// recursively, because there could be a load of a load of a load that are
@ -119,10 +123,10 @@ void LoadVN::getEqualNumberNodes(Value *V,
UI != UE; ++UI)
if (LoadInst *Cand = dyn_cast<LoadInst>(*UI)) {// Is a load of source?
if (Cand->getParent()->getParent() == F && // In the same function?
Cand != LI) // Not LI itself?
Cand != LI && !Cand->isVolatile()) // Not LI itself?
CandidateLoads.push_back(Cand); // Got one...
} else if (StoreInst *Cand = dyn_cast<StoreInst>(*UI)) {
if (Cand->getParent()->getParent() == F &&
if (Cand->getParent()->getParent() == F && !Cand->isVolatile() &&
Cand->getOperand(1) == Source) // It's a store THROUGH the ptr...
CandidateStores.push_back(Cand);
}