cc9a6ed09d
The passID is not currently stored in Pass but this avoids the unused variable warning. The passID is used to uniquely identify passes, currently this is only stored/used in PassInfo. PiperOrigin-RevId: 220485662
94 lines
3.2 KiB
C++
94 lines
3.2 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/MLFunction.h"
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#include "mlir/IR/StmtVisitor.h"
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#include "mlir/Pass.h"
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#include "mlir/Transforms/Passes.h"
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#define DEBUG_TYPE "simplify-affine-structure"
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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 SimplifyAffineStructures : public FunctionPass,
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StmtWalker<SimplifyAffineStructures> {
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explicit SimplifyAffineStructures()
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: FunctionPass(&SimplifyAffineStructures::passID) {}
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PassResult runOnMLFunction(MLFunction *f) override;
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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) override { return success(); }
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void visitIfStmt(IfStmt *ifStmt);
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void visitOperationStmt(OperationStmt *opStmt);
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static char passID;
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};
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} // end anonymous namespace
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char SimplifyAffineStructures::passID = 0;
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FunctionPass *mlir::createSimplifyAffineStructuresPass() {
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return new SimplifyAffineStructures();
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}
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static IntegerSet simplifyIntegerSet(IntegerSet set) {
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FlatAffineConstraints fac(set);
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if (fac.isEmpty())
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return IntegerSet::getEmptySet(set.getNumDims(), set.getNumSymbols(),
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set.getContext());
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return set;
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}
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void SimplifyAffineStructures::visitIfStmt(IfStmt *ifStmt) {
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auto set = ifStmt->getCondition().getIntegerSet();
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ifStmt->setIntegerSet(simplifyIntegerSet(set));
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}
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void SimplifyAffineStructures::visitOperationStmt(OperationStmt *opStmt) {
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for (auto attr : opStmt->getAttrs()) {
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if (auto mapAttr = attr.second.dyn_cast<AffineMapAttr>()) {
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MutableAffineMap mMap(mapAttr.getValue());
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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));
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}
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}
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}
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PassResult SimplifyAffineStructures::runOnMLFunction(MLFunction *f) {
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walk(f);
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return success();
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}
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static PassRegistration<SimplifyAffineStructures>
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pass("simplify-affine-structures", "Simplify affine expressions");
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