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Fix 2004-10-10-CastStoreOnce.llx, by adjusting types back if we strip off a cast

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16878 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-10 17:07:12 +00:00
parent b3deddcf25
commit 8be8012ba4
1 changed files with 21 additions and 18 deletions
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39
lib/Transforms/IPO/GlobalOpt.cpp
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@ -447,27 +447,30 @@ static bool OptimizeOnceStoredGlobal(GlobalVariable *GV, Value *StoredOnceVal) {
// initializer. Instead, replace all of the loads with the stored value.
if (isa<PointerType>(GV->getInitializer()->getType()) &&
GV->getInitializer()->isNullValue()) {
if (isa<Constant>(StoredOnceVal) &&
AllUsesOfLoadedValueWillTrapIfNull(GV)) {
DEBUG(std::cerr << "REPLACING STORED GLOBAL POINTER: " << *GV);
if (Constant *SOVC = dyn_cast<Constant>(StoredOnceVal))
if (AllUsesOfLoadedValueWillTrapIfNull(GV)) {
DEBUG(std::cerr << "REPLACING STORED GLOBAL POINTER: " << *GV);
//std::cerr << " Stored Value: " << *StoredOnceVal << "\n";
if (GV->getInitializer()->getType() != SOVC->getType())
SOVC = ConstantExpr::getCast(SOVC, GV->getInitializer()->getType());
// Replace all uses of loads with uses of uses of the stored value.
while (!GV->use_empty())
if (LoadInst *LI = dyn_cast<LoadInst>(GV->use_back())) {
LI->replaceAllUsesWith(StoredOnceVal);
LI->getParent()->getInstList().erase(LI); // Nuke the load.
} else if (StoreInst *SI = dyn_cast<StoreInst>(GV->use_back())) {
SI->getParent()->getInstList().erase(SI); // Nuke the store
} else {
assert(0 && "Unknown user of stored once global!");
}
//std::cerr << " Stored Value: " << *SOVC << "\n";
// Nuke the now-dead global.
GV->getParent()->getGlobalList().erase(GV);
return true;
}
// Replace all uses of loads with uses of uses of the stored value.
while (!GV->use_empty())
if (LoadInst *LI = dyn_cast<LoadInst>(GV->use_back())) {
LI->replaceAllUsesWith(SOVC);
LI->getParent()->getInstList().erase(LI); // Nuke the load.
} else if (StoreInst *SI = dyn_cast<StoreInst>(GV->use_back())) {
SI->getParent()->getInstList().erase(SI); // Nuke the store
} else {
assert(0 && "Unknown user of stored once global!");
}
// Nuke the now-dead global.
GV->getParent()->getGlobalList().erase(GV);
return true;
}
//if (isa<MallocInst>(StoredOnceValue))
}
return false;