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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/Function.h"
#include "mlir/IR/InstVisitor.h"
#include "mlir/Pass.h"
#include "mlir/Transforms/Passes.h"
#define DEBUG_TYPE "simplify-affine-structure"
using namespace mlir;
using llvm::report_fatal_error;
namespace {
/// Simplifies all affine expressions appearing in the operation instructions of
/// the Function. 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 SimplifyAffineStructures : public FunctionPass,
InstWalker<SimplifyAffineStructures> {
explicit SimplifyAffineStructures()
: FunctionPass(&SimplifyAffineStructures::passID) {}
PassResult runOnMLFunction(Function *f) override;
// Does nothing on CFG functions for now. No reusable walkers/visitors exist
// for this yet? TODO(someone).
PassResult runOnCFGFunction(Function *f) override { return success(); }
void visitIfInst(IfInst *ifInst);
void visitOperationInst(OperationInst *opInst);
static char passID;
};
} // end anonymous namespace
char SimplifyAffineStructures::passID = 0;
FunctionPass *mlir::createSimplifyAffineStructuresPass() {
return new SimplifyAffineStructures();
}
/// Performs basic integer set simplifications. Checks if it's empty, and
/// replaces it with the canonical empty set if it is.
static IntegerSet simplifyIntegerSet(IntegerSet set) {
FlatAffineConstraints fac(set);
if (fac.isEmpty())
return IntegerSet::getEmptySet(set.getNumDims(), set.getNumSymbols(),
set.getContext());
return set;
}
void SimplifyAffineStructures::visitIfInst(IfInst *ifInst) {
auto set = ifInst->getCondition().getIntegerSet();
ifInst->setIntegerSet(simplifyIntegerSet(set));
}
void SimplifyAffineStructures::visitOperationInst(OperationInst *opInst) {
for (auto attr : opInst->getAttrs()) {
if (auto mapAttr = attr.second.dyn_cast<AffineMapAttr>()) {
MutableAffineMap mMap(mapAttr.getValue());
mMap.simplify();
auto map = mMap.getAffineMap();
opInst->setAttr(attr.first, AffineMapAttr::get(map));
}
}
}
PassResult SimplifyAffineStructures::runOnMLFunction(Function *f) {
walk(f);
return success();
}
static PassRegistration<SimplifyAffineStructures>
pass("simplify-affine-structures", "Simplify affine expressions");
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