iree/compiler/Codegen/Common/MemrefCopyToLinalg.cpp

// Copyright 2022 The IREE Authors
//
// Licensed 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 "iree/compiler/Codegen/PassDetail.h"
#include "iree/compiler/Codegen/Passes.h"
#include "iree/compiler/Codegen/Utils/Utils.h"
#include "mlir/Dialect/Linalg/IR/Linalg.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"

namespace mlir {
namespace iree_compiler {

namespace {
struct MemrefCopyOpToLinalg : public OpRewritePattern<memref::CopyOp> {
  using OpRewritePattern<memref::CopyOp>::OpRewritePattern;

  LogicalResult matchAndRewrite(memref::CopyOp copyOp,
                                PatternRewriter &rewriter) const override {
    Operation *linalgCopy =
        createLinalgCopyOp(rewriter, copyOp.getLoc(), copyOp.source(),
                           copyOp.target(), copyOp->getAttrs());
    rewriter.replaceOp(copyOp, linalgCopy->getResults());
    return success();
  }
};

struct MemrefCopyToLinalgPass
    : public MemrefCopyToLinalgPassBase<MemrefCopyToLinalgPass> {
  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<linalg::LinalgDialect>();
  }

  void runOnOperation() override {
    MLIRContext *context = &getContext();
    RewritePatternSet patterns(&getContext());
    patterns.insert<MemrefCopyOpToLinalg>(context);
    if (failed(applyPatternsAndFoldGreedily(getOperation(),
                                            std::move(patterns)))) {
      return signalPassFailure();
    }
  }
};

}  // namespace

std::unique_ptr<OperationPass<FuncOp>> createMemrefCopyToLinalgPass() {
  return std::make_unique<MemrefCopyToLinalgPass>();
}

}  // namespace iree_compiler
}  // namespace mlir