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