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minor tweaks for formatting, allow bitcast in ValueIsOnlyUsedLocallyOrStoredToOneGlobal.

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llvm-svn: 61046
This commit is contained in:
Chris Lattner 2008-12-15 21:08:54 +00:00
parent 592852605f
commit 15ac84e027
1 changed files with 29 additions and 12 deletions
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41
lib/Transforms/IPO/GlobalOpt.cpp
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@ -927,26 +927,43 @@ static GlobalVariable *OptimizeGlobalAddressOfMalloc(GlobalVariable *GV,
static bool ValueIsOnlyUsedLocallyOrStoredToOneGlobal(Instruction *V,
GlobalVariable *GV,
SmallPtrSet<PHINode*, 8> &PHIs) {
for (Value::use_iterator UI = V->use_begin(), E = V->use_end(); UI != E; ++UI)
if (isa<LoadInst>(*UI) || isa<CmpInst>(*UI)) {
// Fine, ignore.
} else if (StoreInst *SI = dyn_cast<StoreInst>(*UI)) {
for (Value::use_iterator UI = V->use_begin(), E = V->use_end(); UI != E;++UI){
Instruction *Inst = dyn_cast<Instruction>(*UI);
if (Inst == 0) return false;
if (isa<LoadInst>(Inst) || isa<CmpInst>(Inst)) {
continue; // Fine, ignore.
}
if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
if (SI->getOperand(0) == V && SI->getOperand(1) != GV)
return false; // Storing the pointer itself... bad.
// Otherwise, storing through it, or storing into GV... fine.
} else if (isa<GetElementPtrInst>(*UI)) {
if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(cast<Instruction>(*UI),
GV, PHIs))
continue; // Otherwise, storing through it, or storing into GV... fine.
}
if (isa<GetElementPtrInst>(Inst)) {
if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(Inst, GV, PHIs))
return false;
} else if (PHINode *PN = dyn_cast<PHINode>(*UI)) {
continue;
}
if (PHINode *PN = dyn_cast<PHINode>(Inst)) {
// PHIs are ok if all uses are ok. Don't infinitely recurse through PHI
// cycles.
if (PHIs.insert(PN))
if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(PN, GV, PHIs))
return false;
} else {
return false;
continue;
}
if (BitCastInst *BCI = dyn_cast<BitCastInst>(Inst)) {
if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(BCI, GV, PHIs))
return false;
continue;
}
return false;
}
return true;
}
@ -1341,7 +1358,7 @@ static bool TryToOptimizeStoreOfMallocToGlobal(GlobalVariable *GV,
static bool OptimizeOnceStoredGlobal(GlobalVariable *GV, Value *StoredOnceVal,
Module::global_iterator &GVI,
TargetData &TD) {
if (CastInst *CI = dyn_cast<CastInst>(StoredOnceVal))
if (BitCastInst *CI = dyn_cast<BitCastInst>(StoredOnceVal))
StoredOnceVal = CI->getOperand(0);
else if (GetElementPtrInst *GEPI =dyn_cast<GetElementPtrInst>(StoredOnceVal)){
// "getelementptr Ptr, 0, 0, 0" is really just a cast.