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//===- Canonicalizer.cpp - Canonicalize MLIR operations -------------------===//
//
// 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 transformation pass converts operations into their canonical forms by
// folding constants, applying operation identity transformations etc.
//
//===----------------------------------------------------------------------===//
#include "mlir/Transforms/Passes.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
namespace mlir {
#define GEN_PASS_DEF_CANONICALIZER
#include "mlir/Transforms/Passes.h.inc"
} // namespace mlir
using namespace mlir;
namespace {
/// Canonicalize operations in nested regions.
struct Canonicalizer : public impl::CanonicalizerBase<Canonicalizer> {
Canonicalizer() = default;
Canonicalizer(const GreedyRewriteConfig &config,
ArrayRef<std::string> disabledPatterns,
ArrayRef<std::string> enabledPatterns)
: config(config) {
this->topDownProcessingEnabled = config.useTopDownTraversal;
this->enableRegionSimplification = config.enableRegionSimplification;
this->maxIterations = config.maxIterations;
this->maxNumRewrites = config.maxNumRewrites;
this->disabledPatterns = disabledPatterns;
this->enabledPatterns = enabledPatterns;
}
/// Initialize the canonicalizer by building the set of patterns used during
/// execution.
LogicalResult initialize(MLIRContext *context) override {
// Set the config from possible pass options set in the meantime.
config.useTopDownTraversal = topDownProcessingEnabled;
config.enableRegionSimplification = enableRegionSimplification;
config.maxIterations = maxIterations;
config.maxNumRewrites = maxNumRewrites;
RewritePatternSet owningPatterns(context);
for (auto *dialect : context->getLoadedDialects())
dialect->getCanonicalizationPatterns(owningPatterns);
for (RegisteredOperationName op : context->getRegisteredOperations())
op.getCanonicalizationPatterns(owningPatterns, context);
patterns = std::make_shared<FrozenRewritePatternSet>(
std::move(owningPatterns), disabledPatterns, enabledPatterns);
return success();
}
void runOnOperation() override {
LogicalResult converged =
applyPatternsAndFoldGreedily(getOperation(), *patterns, config);
// Canonicalization is best-effort. Non-convergence is not a pass failure.
if (testConvergence && failed(converged))
signalPassFailure();
}
GreedyRewriteConfig config;
std::shared_ptr<const FrozenRewritePatternSet> patterns;
};
} // namespace
/// Create a Canonicalizer pass.
std::unique_ptr<Pass> mlir::createCanonicalizerPass() {
return std::make_unique<Canonicalizer>();
}
/// Creates an instance of the Canonicalizer pass with the specified config.
std::unique_ptr<Pass>
mlir::createCanonicalizerPass(const GreedyRewriteConfig &config,
ArrayRef<std::string> disabledPatterns,
ArrayRef<std::string> enabledPatterns) {
return std::make_unique<Canonicalizer>(config, disabledPatterns,
enabledPatterns);
}
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