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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 "PassDetail.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
#include "mlir/Transforms/Passes.h"
using namespace mlir;
namespace {
/// Canonicalize operations in nested regions.
struct Canonicalizer : public CanonicalizerBase<Canonicalizer> {
Canonicalizer(const GreedyRewriteConfig &config) : config(config) {}
Canonicalizer() {
// Default constructed Canonicalizer takes its settings from command line
// options.
config.useTopDownTraversal = topDownProcessingEnabled;
config.enableRegionSimplification = enableRegionSimplification;
config.maxIterations = maxIterations;
}
/// Initialize the canonicalizer by building the set of patterns used during
/// execution.
LogicalResult initialize(MLIRContext *context) override {
RewritePatternSet owningPatterns(context);
for (auto *dialect : context->getLoadedDialects())
dialect->getCanonicalizationPatterns(owningPatterns);
for (auto *op : context->getRegisteredOperations())
op->getCanonicalizationPatterns(owningPatterns, context);
patterns = FrozenRewritePatternSet(std::move(owningPatterns),
disabledPatterns, enabledPatterns);
return success();
}
void runOnOperation() override {
(void)applyPatternsAndFoldGreedily(getOperation()->getRegions(), patterns,
config);
}
GreedyRewriteConfig config;
FrozenRewritePatternSet patterns;
};
} // end anonymous 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) {
return std::make_unique<Canonicalizer>(config);
}
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