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//===- ToyCombine.td - Pattern Match Optimizations for Toy -*- tablegen -*-===//
//
// Copyright 2019 The MLIR Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// =============================================================================
//
// Defines language-specific pattern match optimizations for Toy using
// Declarative Rewrite Rules (DRR) specified using TableGen records.
//
//===----------------------------------------------------------------------===//
#ifndef TOY_COMBINE
#define TOY_COMBINE
include "toy/Ops.td"
/// Note: The DRR definition used for defining patterns is shown below:
///
/// class Pattern<
/// dag sourcePattern, list<dag> resultPatterns,
/// list<dag> additionalConstraints = [],
/// dag benefitsAdded = (addBenefit 0)
/// >;
//===----------------------------------------------------------------------===//
// Basic Pattern-Match and Rewrite
//===----------------------------------------------------------------------===//
// Reshape(Reshape(x)) = Reshape(x)
def ReshapeReshapeOptPattern : Pat<(ReshapeOp(ReshapeOp $arg)),
(ReshapeOp $arg)>;
//===----------------------------------------------------------------------===//
// Pattern-Match and Rewrite using Native Code Call
//===----------------------------------------------------------------------===//
// Native Code Calls may be used for more complex transformations using inline
// C++ and C++ helper functions.
// Reshape(Constant(x)) = x'
def ReshapeConstant :
NativeCodeCall<"$0.reshape(($1->getType()).cast<ShapedType>())">;
def FoldConstantReshapeOptPattern : Pat<
(ReshapeOp:$res (ConstantOp $arg)),
(ConstantOp (ReshapeConstant $arg, $res))>;
//===----------------------------------------------------------------------===//
// Pattern-Match and Rewrite with Constraints
//===----------------------------------------------------------------------===//
// DRR allows for constraint checking when the transformation is conditional
// on operand properties.
// Reshape(x) = x, where input and output shapes are identical
def TypesAreIdentical : Constraint<CPred<"$0->getType() == $1->getType()">>;
def RedundantReshapeOptPattern : Pat<
(ReshapeOp:$res $arg), (replaceWithValue $arg),
[(TypesAreIdentical $res, $arg)]>;
#endif // TOY_COMBINE
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