//===- TestVectorTransforms.cpp - Test Vector transforms and lowerings ----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include <type_traits>

#include "mlir/Analysis/SliceAnalysis.h"
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/GPU/IR/GPUDialect.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/Linalg/IR/Linalg.h"
#include "mlir/Dialect/Linalg/Passes.h"
#include "mlir/Dialect/Linalg/Transforms/Transforms.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/SCF/IR/SCF.h"
#include "mlir/Dialect/Vector/IR/VectorOps.h"
#include "mlir/Dialect/Vector/Transforms/VectorDistribution.h"
#include "mlir/Dialect/Vector/Transforms/VectorTransforms.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Pass/PassManager.h"
#include "mlir/Support/LLVM.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"

using namespace mlir;
using namespace mlir::linalg;
using namespace mlir::vector;

namespace {

struct TestVectorToVectorLowering
    : public PassWrapper<TestVectorToVectorLowering,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorToVectorLowering)

  TestVectorToVectorLowering() = default;
  TestVectorToVectorLowering(const TestVectorToVectorLowering &pass)
      : PassWrapper(pass) {}
  StringRef getArgument() const final {
    return "test-vector-to-vector-lowering";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns between ops in the vector dialect";
  }

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<AffineDialect>();
  }

  Option<bool> unroll{*this, "unroll", llvm::cl::desc("Include unrolling"),
                      llvm::cl::init(false)};

  void runOnOperation() override {
    auto *ctx = &getContext();
    RewritePatternSet patterns(ctx);
    if (unroll) {
      populateVectorUnrollPatterns(
          patterns,
          UnrollVectorOptions().setNativeShapeFn(getShape).setFilterConstraint(
              filter));
    }
    populateVectorToVectorCanonicalizationPatterns(patterns);
    populateBubbleVectorBitCastOpPatterns(patterns);
    populateCastAwayVectorLeadingOneDimPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }

private:
  // Return the target shape based on op type.
  static Optional<SmallVector<int64_t, 4>> getShape(Operation *op) {
    if (isa<arith::AddFOp, arith::SelectOp, arith::CmpFOp>(op))
      return SmallVector<int64_t, 4>(2, 2);
    if (isa<vector::ContractionOp>(op))
      return SmallVector<int64_t, 4>(3, 2);
    // For transfer ops, just propagate the shape coming from
    // InsertStridedSlices/ExtractStridedSlices.
    if (auto readOp = dyn_cast<vector::TransferReadOp>(op)) {
      VectorType dstVec;
      for (Operation *users : readOp->getUsers()) {
        auto extract = dyn_cast<ExtractStridedSliceOp>(users);
        if (!extract)
          return llvm::None;
        auto vecType = extract.getResult().getType().cast<VectorType>();
        if (dstVec && dstVec != vecType)
          return llvm::None;
        dstVec = vecType;
      }
      return SmallVector<int64_t, 4>(dstVec.getShape().begin(),
                                     dstVec.getShape().end());
    }
    if (auto writeOp = dyn_cast<vector::TransferWriteOp>(op)) {
      auto insert = writeOp.getVector().getDefiningOp<InsertStridedSliceOp>();
      if (!insert)
        return llvm::None;
      ArrayRef<int64_t> shape = insert.getSourceVectorType().getShape();
      return SmallVector<int64_t, 4>(shape.begin(), shape.end());
    }
    return llvm::None;
  }

  static LogicalResult filter(Operation *op) {
    return success(isa<arith::AddFOp, arith::SelectOp, arith::CmpFOp,
                       ContractionOp, TransferReadOp, TransferWriteOp>(op));
  }
};

struct TestVectorContractionLowering
    : public PassWrapper<TestVectorContractionLowering,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorContractionLowering)

  StringRef getArgument() const final {
    return "test-vector-contraction-lowering";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns that lower contract ops in the vector "
           "dialect";
  }
  TestVectorContractionLowering() = default;
  TestVectorContractionLowering(const TestVectorContractionLowering &pass)
      : PassWrapper(pass) {}

  Option<bool> lowerToFlatMatrix{
      *this, "vector-lower-matrix-intrinsics",
      llvm::cl::desc("Lower vector.contract to llvm.intr.matrix.multiply"),
      llvm::cl::init(false)};
  Option<bool> lowerToOuterProduct{
      *this, "vector-outerproduct",
      llvm::cl::desc("Lower vector.contract to vector.outerproduct"),
      llvm::cl::init(false)};
  Option<bool> lowerToFilterOuterProduct{
      *this, "vector-filter-outerproduct",
      llvm::cl::desc("Lower vector.contract to vector.outerproduct but not for "
                     "vectors of size 4."),
      llvm::cl::init(false)};
  Option<bool> lowerToParallelArith{
      *this, "vector-parallel-arith",
      llvm::cl::desc("Lower vector.contract to elementwise vector ops."),
      llvm::cl::init(false)};

  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());

    // Test on one pattern in isolation.
    if (lowerToOuterProduct) {
      VectorContractLowering lowering = VectorContractLowering::OuterProduct;
      VectorTransformsOptions options{lowering};
      patterns.add<ContractionOpToOuterProductOpLowering>(options,
                                                          &getContext());
      (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
      return;
    }

    // Test on one pattern in isolation.
    if (lowerToFilterOuterProduct) {
      VectorContractLowering lowering = VectorContractLowering::OuterProduct;
      VectorTransformsOptions options{lowering};
      patterns.add<ContractionOpToOuterProductOpLowering>(
          options, &getContext(), /*benefit=*/1, [](vector::ContractionOp op) {
            // Only lowers vector.contract where the lhs as a type vector<MxNx?>
            // where M is not 4.
            if (op.getRhsType().getShape()[0] == 4)
              return failure();
            return success();
          });
      (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
      return;
    }

    if (lowerToParallelArith) {
      vector::populateVectorContractLoweringPatterns(
          patterns,
          vector::VectorTransformsOptions().setVectorTransformsOptions(
              vector::VectorContractLowering::ParallelArith));
      (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
      return;
    }

    // Test on all contract lowering patterns.
    VectorContractLowering contractLowering = VectorContractLowering::Dot;
    if (lowerToFlatMatrix)
      contractLowering = VectorContractLowering::Matmul;
    VectorMultiReductionLowering vectorMultiReductionLowering =
        VectorMultiReductionLowering::InnerParallel;
    VectorTransformsOptions options{contractLowering,
                                    vectorMultiReductionLowering,
                                    VectorTransposeLowering()};
    populateVectorBroadcastLoweringPatterns(patterns);
    populateVectorContractLoweringPatterns(patterns, options);
    populateVectorMaskOpLoweringPatterns(patterns);
    populateVectorShapeCastLoweringPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorTransposeLowering
    : public PassWrapper<TestVectorTransposeLowering,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorTransposeLowering)

  StringRef getArgument() const final {
    return "test-vector-transpose-lowering";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns that lower contract ops in the vector "
           "dialect";
  }
  TestVectorTransposeLowering() = default;
  TestVectorTransposeLowering(const TestVectorTransposeLowering &pass)
      : PassWrapper(pass) {}

  Option<bool> lowerToEltwise{
      *this, "eltwise",
      llvm::cl::desc("Lower 2-D vector.transpose to eltwise insert/extract"),
      llvm::cl::init(false)};
  Option<bool> lowerToFlatTranspose{
      *this, "flat",
      llvm::cl::desc("Lower 2-D vector.transpose to vector.flat_transpose"),
      llvm::cl::init(false)};
  Option<bool> lowerToShuffleTranspose{
      *this, "shuffle",
      llvm::cl::desc("Lower 2-D vector.transpose to shape_cast + shuffle"),
      llvm::cl::init(false)};
  Option<bool> lowerToAvx2{
      *this, "avx2",
      llvm::cl::desc("Lower vector.transpose to avx2-specific patterns"),
      llvm::cl::init(false)};

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<LLVM::LLVMDialect>();
  }

  void runOnOperation() override {
    func::FuncOp funcOp = getOperation();
    MLIRContext *context = funcOp.getContext();
    RewritePatternSet patterns(context);

    vector::VectorTransformsOptions vectorTransformOptions;
    if (lowerToEltwise) {
      vectorTransformOptions =
          vectorTransformOptions.setVectorTransposeLowering(
              VectorTransposeLowering::EltWise);
    }
    if (lowerToFlatTranspose) {
      vectorTransformOptions =
          vectorTransformOptions.setVectorTransposeLowering(
              VectorTransposeLowering::Flat);
    }
    if (lowerToShuffleTranspose) {
      vectorTransformOptions =
          vectorTransformOptions.setVectorTransposeLowering(
              VectorTransposeLowering::Shuffle);
    }
    vector::populateVectorTransposeLoweringPatterns(patterns,
                                                    vectorTransformOptions);

    if (lowerToAvx2) {
      auto avx2LoweringOptions =
          x86vector::avx2::LoweringOptions().setTransposeOptions(
              x86vector::avx2::TransposeLoweringOptions()
                  .lower4x8xf32()
                  .lower8x8xf32());
      x86vector::avx2::populateSpecializedTransposeLoweringPatterns(
          patterns, avx2LoweringOptions, /*benefit=*/10);
    }

    if (failed(applyPatternsAndFoldGreedily(funcOp, std::move(patterns))))
      return signalPassFailure();
  }
};

struct TestVectorUnrollingPatterns
    : public PassWrapper<TestVectorUnrollingPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorUnrollingPatterns)

  StringRef getArgument() const final {
    return "test-vector-unrolling-patterns";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns to unroll contract ops in the vector "
           "dialect";
  }
  TestVectorUnrollingPatterns() = default;
  TestVectorUnrollingPatterns(const TestVectorUnrollingPatterns &pass)
      : PassWrapper(pass) {}
  void runOnOperation() override {
    MLIRContext *ctx = &getContext();
    RewritePatternSet patterns(ctx);
    populateVectorUnrollPatterns(
        patterns, UnrollVectorOptions()
                      .setNativeShape(ArrayRef<int64_t>{2, 2})
                      .setFilterConstraint([](Operation *op) {
                        return success(isa<arith::AddFOp, vector::FMAOp,
                                           vector::MultiDimReductionOp>(op));
                      }));
    populateVectorUnrollPatterns(
        patterns, UnrollVectorOptions()
                      .setNativeShape(ArrayRef<int64_t>{2})
                      .setFilterConstraint([](Operation *op) {
                        return success(isa<vector::ReductionOp>(op));
                      }));
    populateVectorUnrollPatterns(
        patterns, UnrollVectorOptions()
                      .setNativeShape(ArrayRef<int64_t>{1, 3, 4, 2})
                      .setFilterConstraint([](Operation *op) {
                        return success(isa<vector::TransposeOp>(op));
                      }));

    if (unrollBasedOnType) {
      UnrollVectorOptions::NativeShapeFnType nativeShapeFn =
          [](Operation *op) -> Optional<SmallVector<int64_t, 4>> {
        vector::ContractionOp contractOp = cast<vector::ContractionOp>(op);
        SmallVector<int64_t, 4> nativeShape(
            contractOp.getIteratorTypes().size(), 4);
        Type lhsType = contractOp.getLhsType().getElementType();
        nativeShape[nativeShape.size() - 1] = lhsType.isF16() ? 4 : 2;
        return nativeShape;
      };

      UnrollVectorOptions opts;
      opts.setNativeShapeFn(nativeShapeFn)
          .setFilterConstraint(
              [](Operation *op) { return success(isa<ContractionOp>(op)); });

      if (!unrollOrder.empty()) {
        opts.setUnrollTraversalOrderFn([this](Operation *op)
                                           -> Optional<SmallVector<int64_t>> {
          vector::ContractionOp contractOp = cast<vector::ContractionOp>(op);
          if (contractOp.getIteratorTypes().size() == unrollOrder.size())
            return SmallVector<int64_t>(unrollOrder.begin(), unrollOrder.end());
          return None;
        });
      }
      populateVectorUnrollPatterns(patterns, opts);
    } else {
      auto nativeShapeFn =
          [](Operation *op) -> Optional<SmallVector<int64_t, 4>> {
        auto contractOp = dyn_cast<ContractionOp>(op);
        if (!contractOp)
          return None;
        return SmallVector<int64_t, 4>(contractOp.getIteratorTypes().size(), 2);
      };
      populateVectorUnrollPatterns(patterns,
                                   UnrollVectorOptions()
                                       .setNativeShapeFn(nativeShapeFn)
                                       .setFilterConstraint([](Operation *op) {
                                         return success(isa<ContractionOp>(op));
                                       }));
    }
    populateVectorToVectorCanonicalizationPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }

  ListOption<int64_t> unrollOrder{*this, "unroll-order",
                                  llvm::cl::desc("set the unroll order")};

  Option<bool> unrollBasedOnType{
      *this, "unroll-based-on-type",
      llvm::cl::desc("Set the unroll factor based on type of the operation"),
      llvm::cl::init(false)};
};

struct TestVectorTransferUnrollingPatterns
    : public PassWrapper<TestVectorTransferUnrollingPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorTransferUnrollingPatterns)

  TestVectorTransferUnrollingPatterns() = default;
  TestVectorTransferUnrollingPatterns(
      const TestVectorTransferUnrollingPatterns &pass)
      : PassWrapper(pass) {}

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<AffineDialect>();
  }
  StringRef getArgument() const final {
    return "test-vector-transfer-unrolling-patterns";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns to unroll transfer ops in the vector "
           "dialect";
  }
  void runOnOperation() override {
    MLIRContext *ctx = &getContext();
    RewritePatternSet patterns(ctx);
    UnrollVectorOptions opts;
    opts.setNativeShape(ArrayRef<int64_t>{2, 2})
        .setFilterConstraint([](Operation *op) {
          return success(
              isa<vector::TransferReadOp, vector::TransferWriteOp>(op));
        });
    if (reverseUnrollOrder.getValue()) {
      opts.setUnrollTraversalOrderFn(
          [](Operation *op) -> Optional<SmallVector<int64_t>> {
            int64_t numLoops = 0;
            if (auto readOp = dyn_cast<vector::TransferReadOp>(op))
              numLoops = readOp.getVectorType().getRank();
            else if (auto writeOp = dyn_cast<vector::TransferWriteOp>(op))
              numLoops = writeOp.getVectorType().getRank();
            else
              return None;
            auto order = llvm::reverse(llvm::seq<int64_t>(0, numLoops));
            return llvm::to_vector(order);
          });
    }
    populateVectorUnrollPatterns(patterns, opts);
    populateVectorToVectorCanonicalizationPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }

  Option<bool> reverseUnrollOrder{
      *this, "reverse-unroll-order",
      llvm::cl::desc(
          "reverse the order of unrolling of vector transfer operations"),
      llvm::cl::init(false)};
};

struct TestVectorTransferFullPartialSplitPatterns
    : public PassWrapper<TestVectorTransferFullPartialSplitPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorTransferFullPartialSplitPatterns)

  StringRef getArgument() const final {
    return "test-vector-transfer-full-partial-split";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns to split "
           "transfer ops via scf.if + linalg ops";
  }
  TestVectorTransferFullPartialSplitPatterns() = default;
  TestVectorTransferFullPartialSplitPatterns(
      const TestVectorTransferFullPartialSplitPatterns &pass)
      : PassWrapper(pass) {}

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<AffineDialect, linalg::LinalgDialect, memref::MemRefDialect,
                    scf::SCFDialect>();
  }

  Option<bool> useLinalgOps{
      *this, "use-memref-copy",
      llvm::cl::desc("Split using a unmasked vector.transfer + linalg.fill + "
                     "memref.copy operations."),
      llvm::cl::init(false)};
  void runOnOperation() override {
    MLIRContext *ctx = &getContext();
    RewritePatternSet patterns(ctx);
    VectorTransformsOptions options;
    if (useLinalgOps)
      options.setVectorTransferSplit(VectorTransferSplit::LinalgCopy);
    else
      options.setVectorTransferSplit(VectorTransferSplit::VectorTransfer);
    patterns.add<VectorTransferFullPartialRewriter>(ctx, options);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorTransferOpt
    : public PassWrapper<TestVectorTransferOpt, OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorTransferOpt)

  StringRef getArgument() const final { return "test-vector-transferop-opt"; }
  StringRef getDescription() const final {
    return "Test optimization transformations for transfer ops";
  }
  void runOnOperation() override { transferOpflowOpt(getOperation()); }
};

struct TestVectorTransferLoweringPatterns
    : public PassWrapper<TestVectorTransferLoweringPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorTransferLoweringPatterns)

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<tensor::TensorDialect, memref::MemRefDialect>();
  }
  StringRef getArgument() const final {
    return "test-vector-transfer-lowering-patterns";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns to lower transfer ops to other vector ops";
  }
  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateVectorTransferLoweringPatterns(patterns);
    populateVectorTransferPermutationMapLoweringPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorMultiReductionLoweringPatterns
    : public PassWrapper<TestVectorMultiReductionLoweringPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorMultiReductionLoweringPatterns)

  TestVectorMultiReductionLoweringPatterns() = default;
  TestVectorMultiReductionLoweringPatterns(
      const TestVectorMultiReductionLoweringPatterns &pass)
      : PassWrapper(pass) {}
  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<memref::MemRefDialect>();
  }
  StringRef getArgument() const final {
    return "test-vector-multi-reduction-lowering-patterns";
  }
  StringRef getDescription() const final {
    return "Test lowering patterns to lower vector.multi_reduction to other "
           "vector ops";
  }
  Option<bool> useOuterReductions{
      *this, "use-outer-reductions",
      llvm::cl::desc("Move reductions to outer most dimensions"),
      llvm::cl::init(false)};
  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateVectorMultiReductionLoweringPatterns(
        patterns, useOuterReductions
                      ? vector::VectorMultiReductionLowering::InnerParallel
                      : vector::VectorMultiReductionLowering::InnerReduction);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorTransferCollapseInnerMostContiguousDims
    : public PassWrapper<TestVectorTransferCollapseInnerMostContiguousDims,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorTransferCollapseInnerMostContiguousDims)

  TestVectorTransferCollapseInnerMostContiguousDims() = default;
  TestVectorTransferCollapseInnerMostContiguousDims(
      const TestVectorTransferCollapseInnerMostContiguousDims &pass) = default;

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<memref::MemRefDialect, AffineDialect>();
  }

  StringRef getArgument() const final {
    return "test-vector-transfer-collapse-inner-most-dims";
  }

  StringRef getDescription() const final {
    return "Test lowering patterns that reducedes the rank of the vector "
           "transfer memory and vector operands.";
  }

  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateVectorTransferCollapseInnerMostContiguousDimsPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorReduceToContractPatternsPatterns
    : public PassWrapper<TestVectorReduceToContractPatternsPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorReduceToContractPatternsPatterns)

  StringRef getArgument() const final {
    return "test-vector-reduction-to-contract-patterns";
  }
  StringRef getDescription() const final {
    return "Test patterns to convert multireduce op to contract and combine "
           "broadcast/transpose to contract";
  }
  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateVectorReductionToContractPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorTransferDropUnitDimsPatterns
    : public PassWrapper<TestVectorTransferDropUnitDimsPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestVectorTransferDropUnitDimsPatterns)

  StringRef getArgument() const final {
    return "test-vector-transfer-drop-unit-dims-patterns";
  }
  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<memref::MemRefDialect>();
  }
  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateVectorTransferDropUnitDimsPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestFlattenVectorTransferPatterns
    : public PassWrapper<TestFlattenVectorTransferPatterns,
                         OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestFlattenVectorTransferPatterns)

  StringRef getArgument() const final {
    return "test-vector-transfer-flatten-patterns";
  }
  StringRef getDescription() const final {
    return "Test patterns to rewrite contiguous row-major N-dimensional "
           "vector.transfer_{read,write} ops into 1D transfers";
  }
  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<memref::MemRefDialect>();
  }
  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateFlattenVectorTransferPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

struct TestVectorScanLowering
    : public PassWrapper<TestVectorScanLowering, OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorScanLowering)

  StringRef getArgument() const final { return "test-vector-scan-lowering"; }
  StringRef getDescription() const final {
    return "Test lowering patterns that lower the scan op in the vector "
           "dialect";
  }
  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());
    populateVectorScanLoweringPatterns(patterns);
    (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
  }
};

/// Allocate shared memory for a single warp to test lowering of
/// WarpExecuteOnLane0Op.
static Value allocateGlobalSharedMemory(Location loc, OpBuilder &builder,
                                        WarpExecuteOnLane0Op warpOp,
                                        Type type) {
  static constexpr int64_t kSharedMemorySpace = 3;
  // Compute type of shared memory buffer.
  MemRefType memrefType;
  if (auto vectorType = type.dyn_cast<VectorType>()) {
    memrefType =
        MemRefType::get(vectorType.getShape(), vectorType.getElementType(), {},
                        kSharedMemorySpace);
  } else {
    memrefType = MemRefType::get({1}, type, {}, kSharedMemorySpace);
  }

  // Get symbol table holding all shared memory globals.
  ModuleOp moduleOp = warpOp->getParentOfType<ModuleOp>();
  SymbolTable symbolTable(moduleOp);

  // Create a pretty name.
  SmallString<64> buf;
  llvm::raw_svector_ostream os(buf);
  interleave(memrefType.getShape(), os, "x");
  os << "x" << memrefType.getElementType();
  std::string symbolName = (Twine("__shared_") + os.str()).str();

  auto ip = builder.saveInsertionPoint();
  builder.setInsertionPoint(moduleOp);
  auto global = builder.create<memref::GlobalOp>(
      loc,
      /*sym_name=*/symbolName,
      /*sym_visibility=*/builder.getStringAttr("private"),
      /*type=*/memrefType,
      /*initial_value=*/Attribute(),
      /*constant=*/false,
      /*alignment=*/IntegerAttr());
  symbolTable.insert(global);
  // The symbol table inserts at the end of the module, but globals are a bit
  // nicer if they are at the beginning.
  global->moveBefore(&moduleOp.front());

  builder.restoreInsertionPoint(ip);
  return builder.create<memref::GetGlobalOp>(loc, memrefType, symbolName);
}

static Value warpReduction(Location loc, OpBuilder &builder, Value input,
                           CombiningKind kind, uint32_t size) {
  Value laneVal = input;
  // Parallel reduction using butterfly shuffles.
  for (uint64_t i = 1; i < size; i <<= 1) {
    Value shuffled = builder
                         .create<gpu::ShuffleOp>(loc, laneVal, i,
                                                 /*width=*/size,
                                                 /*mode=*/gpu::ShuffleMode::XOR)
                         .getShuffleResult();
    laneVal = makeArithReduction(builder, loc, kind, laneVal, shuffled);
  }
  return laneVal;
}

struct TestVectorDistribution
    : public PassWrapper<TestVectorDistribution, OperationPass<func::FuncOp>> {
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestVectorDistribution)

  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<scf::SCFDialect, memref::MemRefDialect, gpu::GPUDialect,
                    AffineDialect>();
  }

  StringRef getArgument() const final { return "test-vector-warp-distribute"; }
  StringRef getDescription() const final {
    return "Test vector warp distribute transformation and lowering patterns";
  }
  TestVectorDistribution() = default;
  TestVectorDistribution(const TestVectorDistribution &pass)
      : PassWrapper(pass) {}

  Option<bool> warpOpToSCF{
      *this, "rewrite-warp-ops-to-scf-if",
      llvm::cl::desc("Lower vector.warp_execute_on_lane0 to scf.if op"),
      llvm::cl::init(false)};

  Option<bool> distributeTransferWriteOps{
      *this, "distribute-transfer-write",
      llvm::cl::desc("Test distribution of transfer write"),
      llvm::cl::init(false)};

  Option<bool> hoistUniform{*this, "hoist-uniform",
                            llvm::cl::desc("Test hoist uniform"),
                            llvm::cl::init(false)};

  Option<bool> propagateDistribution{
      *this, "propagate-distribution",
      llvm::cl::desc("Test distribution propgation"), llvm::cl::init(false)};

  void runOnOperation() override {
    RewritePatternSet patterns(&getContext());

    getOperation().walk([&](Operation *op) {
      if (auto warpOp = dyn_cast<WarpExecuteOnLane0Op>(op)) {
        if (hoistUniform) {
          moveScalarUniformCode(warpOp);
        }
        WalkResult::interrupt();
      }
    });
    MLIRContext *ctx = &getContext();
    if (distributeTransferWriteOps) {
      auto distributionFn = [](vector::TransferWriteOp writeOp) {
        // Create a map (d0, d1) -> (d1) to distribute along the inner
        // dimension. Once we support n-d distribution we can add more
        // complex cases.
        int64_t vecRank = writeOp.getVectorType().getRank();
        OpBuilder builder(writeOp.getContext());
        auto map =
            AffineMap::get(vecRank, 0, builder.getAffineDimExpr(vecRank - 1));
        return map;
      };
      RewritePatternSet patterns(ctx);
      populateDistributeTransferWriteOpPatterns(patterns, distributionFn);
      (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
    }
    if (propagateDistribution) {
      RewritePatternSet patterns(ctx);
      vector::populatePropagateWarpVectorDistributionPatterns(patterns);
      vector::populateDistributeReduction(patterns, warpReduction);
      (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
    }
    WarpExecuteOnLane0LoweringOptions options;
    options.warpAllocationFn = allocateGlobalSharedMemory;
    options.warpSyncronizationFn = [](Location loc, OpBuilder &builder,
                                      WarpExecuteOnLane0Op warpOp) {
      builder.create<gpu::BarrierOp>(loc);
    };
    // Test on one pattern in isolation.
    if (warpOpToSCF) {
      populateWarpExecuteOnLane0OpToScfForPattern(patterns, options);
      (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
      return;
    }
  }
};

} // namespace

namespace mlir {
namespace test {
void registerTestVectorLowerings() {
  PassRegistration<TestVectorToVectorLowering>();

  PassRegistration<TestVectorContractionLowering>();

  PassRegistration<TestVectorTransposeLowering>();

  PassRegistration<TestVectorUnrollingPatterns>();

  PassRegistration<TestVectorTransferUnrollingPatterns>();

  PassRegistration<TestVectorTransferFullPartialSplitPatterns>();

  PassRegistration<TestVectorTransferOpt>();

  PassRegistration<TestVectorTransferLoweringPatterns>();

  PassRegistration<TestVectorMultiReductionLoweringPatterns>();

  PassRegistration<TestVectorTransferCollapseInnerMostContiguousDims>();

  PassRegistration<TestVectorReduceToContractPatternsPatterns>();

  PassRegistration<TestVectorTransferDropUnitDimsPatterns>();

  PassRegistration<TestFlattenVectorTransferPatterns>();

  PassRegistration<TestVectorScanLowering>();

  PassRegistration<TestVectorDistribution>();
}
} // namespace test
} // namespace mlir