forked from OSchip/llvm-project
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
//===- Canonicalizer.cpp - Canonicalize MLIR operations -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This transformation pass converts operations into their canonical forms by
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// folding constants, applying operation identity transformations etc.
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//
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//===----------------------------------------------------------------------===//
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#include "PassDetail.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
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#include "mlir/Transforms/Passes.h"
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using namespace mlir;
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namespace {
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/// Canonicalize operations in nested regions.
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struct Canonicalizer : public CanonicalizerBase<Canonicalizer> {
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Canonicalizer(const GreedyRewriteConfig &config,
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ArrayRef<std::string> disabledPatterns,
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ArrayRef<std::string> enabledPatterns)
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: config(config) {
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this->disabledPatterns = disabledPatterns;
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this->enabledPatterns = enabledPatterns;
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}
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Canonicalizer() {
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// Default constructed Canonicalizer takes its settings from command line
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// options.
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config.useTopDownTraversal = topDownProcessingEnabled;
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config.enableRegionSimplification = enableRegionSimplification;
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config.maxIterations = maxIterations;
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}
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/// Initialize the canonicalizer by building the set of patterns used during
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/// execution.
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LogicalResult initialize(MLIRContext *context) override {
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RewritePatternSet owningPatterns(context);
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for (auto *dialect : context->getLoadedDialects())
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dialect->getCanonicalizationPatterns(owningPatterns);
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for (RegisteredOperationName op : context->getRegisteredOperations())
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op.getCanonicalizationPatterns(owningPatterns, context);
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patterns = FrozenRewritePatternSet(std::move(owningPatterns),
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disabledPatterns, enabledPatterns);
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return success();
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}
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void runOnOperation() override {
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(void)applyPatternsAndFoldGreedily(getOperation()->getRegions(), patterns,
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config);
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}
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GreedyRewriteConfig config;
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FrozenRewritePatternSet patterns;
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};
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} // namespace
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/// Create a Canonicalizer pass.
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std::unique_ptr<Pass> mlir::createCanonicalizerPass() {
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return std::make_unique<Canonicalizer>();
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}
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/// Creates an instance of the Canonicalizer pass with the specified config.
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std::unique_ptr<Pass>
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mlir::createCanonicalizerPass(const GreedyRewriteConfig &config,
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ArrayRef<std::string> disabledPatterns,
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ArrayRef<std::string> enabledPatterns) {
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return std::make_unique<Canonicalizer>(config, disabledPatterns,
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enabledPatterns);
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}
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