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const-ize predicate ValueIsOnlyUsedLocallyOrStoredToOneGlobal

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif
2010-04-06 18:58:22 +00:00
parent fa1f5c22c5
commit 0b520db74d
1 changed files with 10 additions and 9 deletions
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19
lib/Transforms/IPO/GlobalOpt.cpp
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@ -939,17 +939,18 @@ static GlobalVariable *OptimizeGlobalAddressOfMalloc(GlobalVariable *GV,
/// to make sure that there are no complex uses of V. We permit simple things /// to make sure that there are no complex uses of V. We permit simple things
/// like dereferencing the pointer, but not storing through the address, unless /// like dereferencing the pointer, but not storing through the address, unless
/// it is to the specified global. /// it is to the specified global.
static bool ValueIsOnlyUsedLocallyOrStoredToOneGlobal(Instruction *V, static bool ValueIsOnlyUsedLocallyOrStoredToOneGlobal(const Instruction *V,
GlobalVariable *GV, const GlobalVariable *GV,
SmallPtrSet<PHINode*, 8> &PHIs) { SmallPtrSet<const PHINode*, 8> &PHIs) {
for (Value::use_iterator UI = V->use_begin(), E = V->use_end(); UI != E;++UI){ for (Value::const_use_iterator UI = V->use_begin(), E = V->use_end();
Instruction *Inst = cast<Instruction>(*UI); UI != E;++UI){
const Instruction *Inst = cast<Instruction>(*UI);
if (isa<LoadInst>(Inst) || isa<CmpInst>(Inst)) { if (isa<LoadInst>(Inst) || isa<CmpInst>(Inst)) {
continue; // Fine, ignore. continue; // Fine, ignore.
} }
if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) { if (const StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
if (SI->getOperand(0) == V && SI->getOperand(1) != GV) if (SI->getOperand(0) == V && SI->getOperand(1) != GV)
return false; // Storing the pointer itself... bad. return false; // Storing the pointer itself... bad.
continue; // Otherwise, storing through it, or storing into GV... fine. continue; // Otherwise, storing through it, or storing into GV... fine.
@ -961,7 +962,7 @@ static bool ValueIsOnlyUsedLocallyOrStoredToOneGlobal(Instruction *V,
continue; continue;
} }
if (PHINode *PN = dyn_cast<PHINode>(Inst)) { if (const PHINode *PN = dyn_cast<PHINode>(Inst)) {
// PHIs are ok if all uses are ok. Don't infinitely recurse through PHI // PHIs are ok if all uses are ok. Don't infinitely recurse through PHI
// cycles. // cycles.
if (PHIs.insert(PN)) if (PHIs.insert(PN))
@ -970,7 +971,7 @@ static bool ValueIsOnlyUsedLocallyOrStoredToOneGlobal(Instruction *V,
continue; continue;
} }
if (BitCastInst *BCI = dyn_cast<BitCastInst>(Inst)) { if (const BitCastInst *BCI = dyn_cast<BitCastInst>(Inst)) {
if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(BCI, GV, PHIs)) if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(BCI, GV, PHIs))
return false; return false;
continue; continue;
@ -1468,7 +1469,7 @@ static bool TryToOptimizeStoreOfMallocToGlobal(GlobalVariable *GV,
// GEP'd. These are all things we could transform to using the global // GEP'd. These are all things we could transform to using the global
// for. // for.
{ {
SmallPtrSet<PHINode*, 8> PHIs; SmallPtrSet<const PHINode*, 8> PHIs;
if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(CI, GV, PHIs)) if (!ValueIsOnlyUsedLocallyOrStoredToOneGlobal(CI, GV, PHIs))
return false; return false;
} }