llvm/mlir/examples/toy/Ch3/mlir/ToyCombine.cpp

//===- ToyCombine.cpp - Toy High Level Optimizer --------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements a set of simple combiners for optimizing operations in
// the Toy dialect.
//
//===----------------------------------------------------------------------===//

#include "mlir/IR/MLIRContext.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/IR/Value.h"
#include "toy/Dialect.h"
usingnamespacemlir;
usingnamespacetoy;

namespace {
/// Include the patterns defined in the Declarative Rewrite framework.
#include "ToyCombine.inc"
} // namespace

/// This is an example of a c++ rewrite pattern for the TransposeOp. It
/// optimizes the following scenario: transpose(transpose(x)) -> x
struct SimplifyRedundantTranspose : public mlir::OpRewritePattern<TransposeOp> { … };

/// Register our patterns as "canonicalization" patterns on the TransposeOp so
/// that they can be picked up by the Canonicalization framework.
void TransposeOp::getCanonicalizationPatterns(RewritePatternSet &results,
                                              MLIRContext *context) { … }

/// Register our patterns as "canonicalization" patterns on the ReshapeOp so
/// that they can be picked up by the Canonicalization framework.
void ReshapeOp::getCanonicalizationPatterns(RewritePatternSet &results,
                                            MLIRContext *context) { … }