return false;
CallInst *CI = dyn_cast<CallInst>(Inst);
- if (CI == 0 || !CI->onlyReadsMemory())
+ if (!CI || !CI->onlyReadsMemory())
return false;
return true;
}
// have invalidated the live-out memory values of our parent value. For now,
// just be conservative and invalidate memory if this block has multiple
// predecessors.
- if (BB->getSinglePredecessor() == 0)
+ if (!BB->getSinglePredecessor())
++CurrentGeneration;
/// LastStore - Keep track of the last non-volatile store that we saw... for
/// as long as there in no instruction that reads memory. If we see a store
/// to the same location, we delete the dead store. This zaps trivial dead
/// stores which can occur in bitfield code among other things.
- StoreInst *LastStore = 0;
+ StoreInst *LastStore = nullptr;
bool Changed = false;
if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
// Ignore volatile loads.
if (!LI->isSimple()) {
- LastStore = 0;
+ LastStore = nullptr;
continue;
}
// generation, replace this instruction.
std::pair<Value*, unsigned> InVal =
AvailableLoads->lookup(Inst->getOperand(0));
- if (InVal.first != 0 && InVal.second == CurrentGeneration) {
+ if (InVal.first != nullptr && InVal.second == CurrentGeneration) {
DEBUG(dbgs() << "EarlyCSE CSE LOAD: " << *Inst << " to: "
<< *InVal.first << '\n');
if (!Inst->use_empty()) Inst->replaceAllUsesWith(InVal.first);
// Otherwise, remember that we have this instruction.
AvailableLoads->insert(Inst->getOperand(0),
std::pair<Value*, unsigned>(Inst, CurrentGeneration));
- LastStore = 0;
+ LastStore = nullptr;
continue;
}
// If this instruction may read from memory, forget LastStore.
if (Inst->mayReadFromMemory())
- LastStore = 0;
+ LastStore = nullptr;
// If this is a read-only call, process it.
if (CallValue::canHandle(Inst)) {
// If we have an available version of this call, and if it is the right
// generation, replace this instruction.
std::pair<Value*, unsigned> InVal = AvailableCalls->lookup(Inst);
- if (InVal.first != 0 && InVal.second == CurrentGeneration) {
+ if (InVal.first != nullptr && InVal.second == CurrentGeneration) {
DEBUG(dbgs() << "EarlyCSE CSE CALL: " << *Inst << " to: "
<< *InVal.first << '\n');
if (!Inst->use_empty()) Inst->replaceAllUsesWith(InVal.first);
LastStore->eraseFromParent();
Changed = true;
++NumDSE;
- LastStore = 0;
+ LastStore = nullptr;
continue;
}
std::vector<StackNode *> nodesToProcess;
DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
- DL = DLP ? &DLP->getDataLayout() : 0;
+ DL = DLP ? &DLP->getDataLayout() : nullptr;
TLI = &getAnalysis<TargetLibraryInfo>();
DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();