MLIR  20.0.0git
ConcatOpPatterns.cpp
Go to the documentation of this file.
1 //===- ConcatOpPatterns.cpp - Patterns related to tensor.concat lowering --===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
14 #include "mlir/IR/PatternMatch.h"
15 
16 using namespace mlir;
17 using namespace mlir::tensor;
18 
19 namespace {
20 
21 /// Decompose `tensor.concat` into `tensor.empty` and a chain of slice inserts.
22 ///
23 /// %concat = tensor.concat dim(1) %0, %1 :
24 /// (tensor<2x3xf32>, tensor<2x4xf32>) -> tensor<2x7xf32>
25 ///
26 /// Becomes
27 ///
28 /// %empty = tensor.empty() : tensor<2x7xf32>
29 /// %insert0 = tensor.insert_slice %0 into %empty[0, 0][2, 3][1, 1]
30 /// %concat = tensor.insert_slice %1 into %insert0[0, 3][2, 4][1, 1]
31 struct DecomposeTensorConcatOp : public OpRewritePattern<ConcatOp> {
33 
34  LogicalResult matchAndRewrite(ConcatOp concatOp,
35  PatternRewriter &rewriter) const override {
36  FailureOr<SmallVector<Value>> decomposed =
37  concatOp.decomposeOperation(rewriter);
38  if (failed(decomposed)) {
39  return rewriter.notifyMatchFailure(
40  concatOp, "failed to get the decomposed insert slices");
41  }
42  rewriter.replaceOp(concatOp, decomposed.value()[0]);
43  return success();
44  }
45 };
46 
47 } // namespace
48 
51  patterns.add<DecomposeTensorConcatOp>(patterns.getContext());
52 }
A special type of RewriterBase that coordinates the application of a rewrite pattern on the current I...
Definition: PatternMatch.h:791
std::enable_if_t<!std::is_convertible< CallbackT, Twine >::value, LogicalResult > notifyMatchFailure(Location loc, CallbackT &&reasonCallback)
Used to notify the listener that the IR failed to be rewritten because of a match failure,...
Definition: PatternMatch.h:724
virtual void replaceOp(Operation *op, ValueRange newValues)
Replace the results of the given (original) operation with the specified list of values (replacements...
void populateDecomposeTensorConcatPatterns(RewritePatternSet &patterns)
Populates patterns with patterns that decompose tensor.concat into tensor.empty of a tensor of the co...
Include the generated interface declarations.
const FrozenRewritePatternSet & patterns
OpRewritePattern is a wrapper around RewritePattern that allows for matching and rewriting against an...
Definition: PatternMatch.h:358