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Make the non-local CSE safety checks slightly more thorough.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51035 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-05-13 13:41:23 +00:00
parent 0e68771536
commit 16db1f70b7
1 changed files with 8 additions and 6 deletions
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14
lib/Transforms/Scalar/GVN.cpp
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@ -443,7 +443,7 @@ uint32_t ValueTable::lookup_or_add(Value* V) {
DenseMap<BasicBlock*, Value*> deps;
MD->getNonLocalDependency(C, deps);
Value* dep = 0;
CallInst* cdep = 0;
for (DenseMap<BasicBlock*, Value*>::iterator I = deps.begin(),
E = deps.end(); I != E; ++I) {
@ -453,22 +453,24 @@ uint32_t ValueTable::lookup_or_add(Value* V) {
return nextValueNumber++;
} else if (I->second != MemoryDependenceAnalysis::NonLocal) {
if (DT->dominates(I->first, C->getParent())) {
dep = I->second;
if (CallInst* CD = dyn_cast<CallInst>(I->second))
cdep = CD;
else {
valueNumbering.insert(std::make_pair(V, nextValueNumber));
return nextValueNumber++;
}
} else {
valueNumbering.insert(std::make_pair(V, nextValueNumber));
return nextValueNumber++;
}
}
}
if (!dep || !isa<CallInst>(dep)) {
if (!cdep) {
valueNumbering.insert(std::make_pair(V, nextValueNumber));
return nextValueNumber++;
}
CallInst* cdep = cast<CallInst>(dep);
if (cdep->getCalledFunction() != C->getCalledFunction() ||
cdep->getNumOperands() != C->getNumOperands()) {
valueNumbering.insert(std::make_pair(V, nextValueNumber));