[mlir] Remove unused local variables (NFC) (#138642)

Author: kazutakahirata

mlir/lib/Conversion/VectorToGPU/VectorToGPU.cpp

@@ -784,7 +784,6 @@ createNonLdMatrixLoads(RewriterBase &rewriter, vector::TransferReadOp op,
   }
 
   Value laneId = rewriter.create<gpu::LaneIdOp>(loc, /*upperBound=*/nullptr);
-  SmallVector<Value, 4> elements;
 
   // This is the individual element type.
   Type loadedElType = regInfo->registerLLVMType;

mlir/lib/Dialect/MemRef/Transforms/EmulateNarrowType.cpp

@@ -188,7 +188,6 @@ struct ConvertMemRefAllocation final : OpConversionPattern<OpTy> {
 
     Location loc = op.getLoc();
     OpFoldResult zero = rewriter.getIndexAttr(0);
-    SmallVector<OpFoldResult> indices(currentType.getRank(), zero);
 
     // Get linearized type.
     int srcBits = currentType.getElementType().getIntOrFloatBitWidth();

mlir/lib/Dialect/SparseTensor/Transforms/Utils/LoopEmitter.cpp

@@ -955,10 +955,6 @@ std::pair<Operation *, Value> sparse_tensor::genCoIteration(
   // Generates loop body.
   builder.setInsertionPointToStart(after);
   ValueRange aArgs = after->getArguments();
-  // Since some LoopCondKind might need extra checks to filter out invalid
-  // iterations, we maintains another array to hold the iteration arguments to
-  // yield if the checks fails.
-  SmallVector<Value> nextArgs(aArgs.begin(), aArgs.end());
 
   for (SparseIterator *it : spIters) {
     aArgs = it->linkNewScope(aArgs);

mlir/lib/Dialect/Transform/Interfaces/TransformInterfaces.cpp

@@ -1659,7 +1659,6 @@ void transform::detail::getPotentialTopLevelEffects(
       if (!iface)
         continue;
 
-      SmallVector<MemoryEffects::EffectInstance, 2> nestedEffects;
       iface.getEffects(effects);
     }
     return;

mlir/lib/Dialect/Vector/IR/VectorOps.cpp

@@ -1136,7 +1136,6 @@ void ContractionOp::getIterationBounds(
   auto lhsShape = getLhsType().getShape();
   auto resVectorType = llvm::dyn_cast<VectorType>(getResultType());
   SmallVector<AffineMap, 4> indexingMaps(getIndexingMapsArray());
-  SmallVector<int64_t, 2> iterationShape;
   for (const auto &it : llvm::enumerate(getIteratorTypes())) {
     // Search lhs/rhs map results for 'targetExpr'.
     auto targetExpr = getAffineDimExpr(it.index(), getContext());

mlir/lib/Dialect/Vector/Transforms/VectorDistribute.cpp

@@ -878,8 +878,6 @@ struct WarpOpForwardOperand : public WarpDistributionPattern {
   using Base::Base;
   LogicalResult matchAndRewrite(WarpExecuteOnLane0Op warpOp,
                                 PatternRewriter &rewriter) const override {
-    SmallVector<Type> resultTypes;
-    SmallVector<Value> yieldValues;
     auto yield = cast<gpu::YieldOp>(
         warpOp.getBodyRegion().getBlocks().begin()->getTerminator());
     Value valForwarded;

mlir/lib/IR/Verifier.cpp

@@ -179,7 +179,6 @@ LogicalResult OperationVerifier::verifyOnEntrance(Operation &op) {
   if (!numRegions)
     return success();
   auto kindInterface = dyn_cast<RegionKindInterface>(&op);
-  SmallVector<Operation *> opsWithIsolatedRegions;
   // Verify that all child regions are ok.
   MutableArrayRef<Region> regions = op.getRegions();
   for (unsigned i = 0; i < numRegions; ++i) {

mlir/lib/Interfaces/DataLayoutInterfaces.cpp

@@ -402,7 +402,6 @@ static DataLayoutSpecInterface getCombinedDataLayout(Operation *leaf) {
   assert((isa<ModuleOp, DataLayoutOpInterface>(leaf)) &&
          "expected an op with data layout spec");
 
-  SmallVector<DataLayoutOpInterface> opsWithLayout;
   SmallVector<DataLayoutSpecInterface> specs;
   collectParentLayouts(leaf, specs);
 

mlir/lib/Transforms/Utils/InliningUtils.cpp

@@ -248,7 +248,6 @@ static void handleResultImpl(InlinerInterface &interface, OpBuilder &builder,
   }
 
   // Run the result attribute handler for the given result and attribute.
-  SmallVector<DictionaryAttr> resultAttributes;
   for (auto [result, resAttr] : llvm::zip(results, resAttrs)) {
     // Store the original result users before running the handler.
     DenseSet<Operation *> resultUsers(llvm::from_range, result.getUsers());

mlir/test/lib/Dialect/Affine/TestVectorizationUtils.cpp

@@ -239,7 +239,6 @@ void VectorizerTestPass::testVecAffineLoopNest(llvm::raw_ostream &outs) {
   strategy.vectorSizes.push_back(4 /*vectorization factor*/);
   strategy.loopToVectorDim[outermostLoop] = 0;
 
-  ReductionLoopMap reductionLoops;
   SmallVector<LoopReduction, 2> reductions;
   if (!isLoopParallel(outermostLoop, &reductions)) {
     outs << "Outermost loop cannot be parallel\n";

mlir/test/lib/Dialect/SCF/TestSCFUtils.cpp

@@ -41,7 +41,6 @@ struct TestSCFForUtilsPass
 
   void runOnOperation() override {
     func::FuncOp func = getOperation();
-    SmallVector<scf::ForOp, 4> toErase;
 
     if (testReplaceWithNewYields) {
       func.walk([&](scf::ForOp forOp) {

mlir/tools/mlir-tblgen/RewriterGen.cpp

@@ -1847,7 +1847,6 @@ void PatternEmitter::createAggregateLocalVarsForOpArgs(
 
     const auto *operand =
         cast<NamedTypeConstraint *>(resultOp.getArg(argIndex));
-    std::string varName;
     if (operand->isVariadic()) {
       ++numVariadic;
       std::string range;

mlir/tools/mlir-tblgen/SPIRVUtilsGen.cpp

@@ -1180,8 +1180,7 @@ static bool emitSerializationFns(const RecordKeeper &records, raw_ostream &os) {
   llvm::emitSourceFileHeader("SPIR-V Serialization Utilities/Functions", os,
                              records);
 
-  std::string dSerFnString, dDesFnString, serFnString, deserFnString,
-      utilsString;
+  std::string dSerFnString, dDesFnString, serFnString, deserFnString;
   raw_string_ostream dSerFn(dSerFnString), dDesFn(dDesFnString),
       serFn(serFnString), deserFn(deserFnString);
   const Record *attrClass = records.getClass("Attr");