[Transforms] Remove unused local variables (NFC) (#138442)

Author: kazutakahirata

llvm/lib/Transforms/IPO/FunctionImport.cpp

@@ -578,7 +578,6 @@ class WorkloadImportsManager : public ModuleImportsManager {
     GlobalsImporter GVI(Index, DefinedGVSummaries, IsPrevailing, ImportList,
                         ExportLists);
     auto &ValueInfos = SetIter->second;
-    SmallVector<EdgeInfo, 128> GlobWorklist;
     for (auto &VI : llvm::make_early_inc_range(ValueInfos)) {
       auto It = DefinedGVSummaries.find(VI.getGUID());
       if (It != DefinedGVSummaries.end() &&

llvm/lib/Transforms/IPO/IROutliner.cpp

@@ -2702,7 +2702,7 @@ void IROutliner::updateOutputMapping(OutlinableRegion &Region,
 }
 
 bool IROutliner::extractSection(OutlinableRegion &Region) {
-  SetVector<Value *> ArgInputs, Outputs, SinkCands;
+  SetVector<Value *> ArgInputs, Outputs;
   assert(Region.StartBB && "StartBB for the OutlinableRegion is nullptr!");
   BasicBlock *InitialStart = Region.StartBB;
   Function *OrigF = Region.StartBB->getParent();

llvm/lib/Transforms/IPO/Internalize.cpp

@@ -132,7 +132,6 @@ bool InternalizePass::shouldPreserveGV(const GlobalValue &GV) {
 
 bool InternalizePass::maybeInternalize(
     GlobalValue &GV, DenseMap<const Comdat *, ComdatInfo> &ComdatMap) {
-  SmallString<0> ComdatName;
   if (Comdat *C = GV.getComdat()) {
     // For GlobalAlias, C is the aliasee object's comdat which may have been
     // redirected. So ComdatMap may not contain C.

llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp

@@ -2040,8 +2040,6 @@ bool NumericalStabilitySanitizer::sanitizeFunction(
   // the module constructor.
   if (F.getName() == kNsanModuleCtorName)
     return false;
-  SmallVector<Instruction *, 8> AllLoadsAndStores;
-  SmallVector<Instruction *, 8> LocalLoadsAndStores;
 
   // The instrumentation maintains:
   //  - for each IR value `v` of floating-point (or vector floating-point) type

llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp

@@ -2301,11 +2301,8 @@ FindPredecessorRetainWithSafePath(const Value *Arg, BasicBlock *BB,
 /// Look for an ``autorelease'' instruction dependent on Arg such that there are
 /// no instructions dependent on Arg that need a positive ref count in between
 /// the autorelease and the ret.
-static CallInst *
-FindPredecessorAutoreleaseWithSafePath(const Value *Arg, BasicBlock *BB,
-                                       ReturnInst *Ret,
-                                       ProvenanceAnalysis &PA) {
-  SmallPtrSet<Instruction *, 4> DepInsts;
+static CallInst *FindPredecessorAutoreleaseWithSafePath(
+    const Value *Arg, BasicBlock *BB, ReturnInst *Ret, ProvenanceAnalysis &PA) {
   auto *Autorelease = dyn_cast_or_null<CallInst>(
       findSingleDependency(NeedsPositiveRetainCount, Arg, BB, Ret, PA));
 

llvm/lib/Transforms/Scalar/LoopInterchange.cpp

@@ -1463,7 +1463,6 @@ bool LoopInterchangeTransform::transform() {
   BasicBlock *InnerLoopPreHeader = InnerLoop->getLoopPreheader();
   BasicBlock *OuterLoopHeader = OuterLoop->getHeader();
   if (InnerLoopPreHeader != OuterLoopHeader) {
-    SmallPtrSet<Instruction *, 4> NeedsMoving;
     for (Instruction &I :
          make_early_inc_range(make_range(InnerLoopPreHeader->begin(),
                                          std::prev(InnerLoopPreHeader->end()))))

llvm/lib/Transforms/Scalar/NewGVN.cpp

@@ -2737,7 +2737,6 @@ NewGVN::makePossiblePHIOfOps(Instruction *I,
   if (!isCycleFree(I))
     return nullptr;
 
-  SmallPtrSet<const Value *, 8> ProcessedPHIs;
   // TODO: We don't do phi translation on memory accesses because it's
   // complicated. For a load, we'd need to be able to simulate a new memoryuse,
   // which we don't have a good way of doing ATM.

llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp

@@ -2762,7 +2762,6 @@ static BranchInst *turnSelectIntoBranch(SelectInst *SI, DominatorTree &DT,
 static BranchInst *turnGuardIntoBranch(IntrinsicInst *GI, Loop &L,
                                        DominatorTree &DT, LoopInfo &LI,
                                        MemorySSAUpdater *MSSAU) {
-  SmallVector<DominatorTree::UpdateType, 4> DTUpdates;
   LLVM_DEBUG(dbgs() << "Turning " << *GI << " into a branch.\n");
   BasicBlock *CheckBB = GI->getParent();
 

llvm/lib/Transforms/Utils/EscapeEnumerator.cpp

@@ -87,7 +87,6 @@ IRBuilder<> *EscapeEnumerator::Next() {
 
   // Transform the 'call' instructions into 'invoke's branching to the
   // cleanup block. Go in reverse order to make prettier BB names.
-  SmallVector<Value *, 16> Args;
   for (unsigned I = Calls.size(); I != 0;) {
     CallInst *CI = cast<CallInst>(Calls[--I]);
     changeToInvokeAndSplitBasicBlock(CI, CleanupBB, DTU);

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -7186,7 +7186,6 @@ void BoUpSLP::reorderTopToBottom() {
     MapVector<OrdersType, unsigned,
               DenseMap<OrdersType, unsigned, OrdersTypeDenseMapInfo>>
         OrdersUses;
-    SmallPtrSet<const TreeEntry *, 4> VisitedOps;
     for (const TreeEntry *OpTE : OrderedEntries) {
       // No need to reorder this nodes, still need to extend and to use shuffle,
       // just need to merge reordering shuffle and the reuse shuffle.
@@ -8153,7 +8152,6 @@ static void gatherPossiblyVectorizableLoads(
           int &Offset, unsigned &Start) {
         if (Loads.empty())
           return GatheredLoads.end();
-        SmallVector<std::pair<int, int>> Res;
         LoadInst *LI = Loads.front().first;
         for (auto [Idx, Data] : enumerate(GatheredLoads)) {
           if (Idx < Start)
@@ -13801,7 +13799,6 @@ bool BoUpSLP::isFullyVectorizableTinyTree(bool ForReduction) const {
   // with the second gather nodes if they have less scalar operands rather than
   // the initial tree element (may be profitable to shuffle the second gather)
   // or they are extractelements, which form shuffle.
-  SmallVector<int> Mask;
   if (VectorizableTree[0]->State == TreeEntry::Vectorize &&
       AreVectorizableGathers(VectorizableTree[1].get(),
                              VectorizableTree[0]->Scalars.size()))
@@ -16875,8 +16872,6 @@ ResTy BoUpSLP::processBuildVector(const TreeEntry *E, Type *ScalarTy,
   unsigned VF = E->getVectorFactor();
 
   bool NeedFreeze = false;
-  SmallVector<int> ReuseShuffleIndices(E->ReuseShuffleIndices.begin(),
-                                       E->ReuseShuffleIndices.end());
   SmallVector<Value *> GatheredScalars(E->Scalars.begin(), E->Scalars.end());
   // Clear values, to be replaced by insertvector instructions.
   for (auto [EIdx, Idx] : E->CombinedEntriesWithIndices)
@@ -17619,7 +17614,6 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
       SmallPtrSet<BasicBlock *, 4> VisitedBBs;
 
       for (unsigned I : seq<unsigned>(PH->getNumIncomingValues())) {
-        ValueList Operands;
         BasicBlock *IBB = PH->getIncomingBlock(I);
 
         // Stop emission if all incoming values are generated.
@@ -18291,7 +18285,6 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
         TysForDecl.push_back(VecTy);
       auto *CEI = cast<CallInst>(VL0);
       for (unsigned I : seq<unsigned>(0, CI->arg_size())) {
-        ValueList OpVL;
         // Some intrinsics have scalar arguments. This argument should not be
         // vectorized.
         if (UseIntrinsic && isVectorIntrinsicWithScalarOpAtArg(ID, I, TTI)) {

llvm/lib/Transforms/Vectorize/VPlan.cpp

@@ -554,7 +554,6 @@ VPBasicBlock *VPBasicBlock::splitAt(iterator SplitAt) {
   assert((SplitAt == end() || SplitAt->getParent() == this) &&
          "can only split at a position in the same block");
 
-  SmallVector<VPBlockBase *, 2> Succs(successors());
   // Create new empty block after the block to split.
   auto *SplitBlock = getPlan()->createVPBasicBlock(getName() + ".split");
   VPBlockUtils::insertBlockAfter(SplitBlock, this);

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -1892,8 +1892,6 @@ static Value *getStepVector(Value *Val, Value *Step,
          "Induction Step must be an integer or FP");
   assert(Step->getType() == STy && "Step has wrong type");
 
-  SmallVector<Constant *, 8> Indices;
-
   // Create a vector of consecutive numbers from zero to VF.
   VectorType *InitVecValVTy = ValVTy;
   if (STy->isFloatingPointTy()) {