fb3116f59e
For FunctionPass's for passes that want to stop upon error encountered. PiperOrigin-RevId: 213058651
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- SimplifyAffineExpr.cpp - MLIR Affine Structures Class-----*- C++ -*-===//
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//
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// Copyright 2019 The MLIR Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// =============================================================================
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//
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// This file implements a pass to simplify affine expressions.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Analysis/AffineStructures.h"
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#include "mlir/IR/AffineMap.h"
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#include "mlir/IR/Attributes.h"
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#include "mlir/IR/StmtVisitor.h"
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#include "mlir/Transforms/Pass.h"
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#include "mlir/Transforms/Passes.h"
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using namespace mlir;
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using llvm::report_fatal_error;
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namespace {
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/// Simplifies all affine expressions appearing in the operation statements of
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/// the MLFunction. This is mainly to test the simplifyAffineExpr method.
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// TODO(someone): Gradually, extend this to all affine map references found in
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// ML functions and CFG functions.
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struct SimplifyAffineExpr : public FunctionPass {
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explicit SimplifyAffineExpr() {}
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PassResult runOnMLFunction(MLFunction *f);
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// Does nothing on CFG functions for now. No reusable walkers/visitors exist
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// for this yet? TODO(someone).
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PassResult runOnCFGFunction(CFGFunction *f) { return success(); }
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};
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} // end anonymous namespace
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FunctionPass *mlir::createSimplifyAffineExprPass() {
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return new SimplifyAffineExpr();
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}
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AffineMap *MutableAffineMap::getAffineMap() {
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return AffineMap::get(numDims, numSymbols, results, rangeSizes, context);
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}
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PassResult SimplifyAffineExpr::runOnMLFunction(MLFunction *f) {
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struct MapSimplifier : public StmtWalker<MapSimplifier> {
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MLIRContext *context;
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MapSimplifier(MLIRContext *context) : context(context) {}
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void visitOperationStmt(OperationStmt *opStmt) {
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for (auto attr : opStmt->getAttrs()) {
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if (auto *mapAttr = dyn_cast<AffineMapAttr>(attr.second)) {
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MutableAffineMap mMap(mapAttr->getValue(), context);
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mMap.simplify();
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auto *map = mMap.getAffineMap();
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opStmt->setAttr(attr.first, AffineMapAttr::get(map, context));
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}
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}
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}
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};
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MapSimplifier v(f->getContext());
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v.walkPostOrder(f);
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return success();
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}
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