a70aa7bb0d
This has been a major TODO for a very long time, and is necessary for establishing a proper dialect-free dependency layering for the Transforms library. Code was moved to effectively two main locations: * Affine/ There was quite a bit of affine dialect related code in Transforms/ do to historical reasons (of a time way into MLIR's past). The following headers were moved to: Transforms/LoopFusionUtils.h -> Dialect/Affine/LoopFusionUtils.h Transforms/LoopUtils.h -> Dialect/Affine/LoopUtils.h Transforms/Utils.h -> Dialect/Affine/Utils.h The following transforms were also moved: AffineLoopFusion, AffinePipelineDataTransfer, LoopCoalescing * SCF/ Only one SCF pass was in Transforms/ (likely accidentally placed here): ParallelLoopCollapsing The SCF specific utilities in LoopUtils have been moved to SCF/Utils.h * Misc: mlir::moveLoopInvariantCode was also moved to LoopLikeInterface.h given that it is a simple utility defined in terms of LoopLikeOpInterface. Differential Revision: https://reviews.llvm.org/D117848
104 lines
3.7 KiB
C++
104 lines
3.7 KiB
C++
//===- SimplifyAffineStructures.cpp ---------------------------------------===//
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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 file implements a pass to simplify affine structures in operations.
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//
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//===----------------------------------------------------------------------===//
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#include "PassDetail.h"
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#include "mlir/Dialect/Affine/Analysis/Utils.h"
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#include "mlir/Dialect/Affine/IR/AffineOps.h"
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#include "mlir/Dialect/Affine/Passes.h"
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#include "mlir/Dialect/Affine/Utils.h"
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#include "mlir/IR/IntegerSet.h"
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#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
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#define DEBUG_TYPE "simplify-affine-structure"
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using namespace mlir;
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namespace {
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/// Simplifies affine maps and sets appearing in the operations of the Function.
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/// This part is mainly to test the simplifyAffineExpr method. In addition,
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/// all memrefs with non-trivial layout maps are converted to ones with trivial
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/// identity layout ones.
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struct SimplifyAffineStructures
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: public SimplifyAffineStructuresBase<SimplifyAffineStructures> {
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void runOnOperation() override;
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/// Utility to simplify an affine attribute and update its entry in the parent
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/// operation if necessary.
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template <typename AttributeT>
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void simplifyAndUpdateAttribute(Operation *op, StringAttr name,
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AttributeT attr) {
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auto &simplified = simplifiedAttributes[attr];
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if (simplified == attr)
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return;
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// This is a newly encountered attribute.
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if (!simplified) {
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// Try to simplify the value of the attribute.
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auto value = attr.getValue();
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auto simplifiedValue = simplify(value);
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if (simplifiedValue == value) {
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simplified = attr;
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return;
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}
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simplified = AttributeT::get(simplifiedValue);
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}
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// Simplification was successful, so update the attribute.
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op->setAttr(name, simplified);
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}
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IntegerSet simplify(IntegerSet set) { return simplifyIntegerSet(set); }
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/// Performs basic affine map simplifications.
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AffineMap simplify(AffineMap map) {
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MutableAffineMap mMap(map);
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mMap.simplify();
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return mMap.getAffineMap();
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}
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DenseMap<Attribute, Attribute> simplifiedAttributes;
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};
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} // namespace
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std::unique_ptr<OperationPass<FuncOp>>
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mlir::createSimplifyAffineStructuresPass() {
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return std::make_unique<SimplifyAffineStructures>();
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}
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void SimplifyAffineStructures::runOnOperation() {
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auto func = getOperation();
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simplifiedAttributes.clear();
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RewritePatternSet patterns(func.getContext());
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AffineApplyOp::getCanonicalizationPatterns(patterns, func.getContext());
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AffineForOp::getCanonicalizationPatterns(patterns, func.getContext());
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AffineIfOp::getCanonicalizationPatterns(patterns, func.getContext());
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FrozenRewritePatternSet frozenPatterns(std::move(patterns));
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// The simplification of affine attributes will likely simplify the op. Try to
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// fold/apply canonicalization patterns when we have affine dialect ops.
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SmallVector<Operation *> opsToSimplify;
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func.walk([&](Operation *op) {
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for (auto attr : op->getAttrs()) {
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if (auto mapAttr = attr.getValue().dyn_cast<AffineMapAttr>())
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simplifyAndUpdateAttribute(op, attr.getName(), mapAttr);
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else if (auto setAttr = attr.getValue().dyn_cast<IntegerSetAttr>())
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simplifyAndUpdateAttribute(op, attr.getName(), setAttr);
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}
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if (isa<AffineForOp, AffineIfOp, AffineApplyOp>(op))
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opsToSimplify.push_back(op);
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});
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(void)applyOpPatternsAndFold(opsToSimplify, frozenPatterns, /*strict=*/true);
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}
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