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
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
//===- ComposeAffineMaps.cpp - MLIR Affine Transform 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 testing pass which composes affine maps from
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// AffineApplyOps in an MLFunction, by forward subtituting results from an
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// AffineApplyOp into any of its users which are also AffineApplyOps.
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//
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//===----------------------------------------------------------------------===//
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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/Builders.h"
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#include "mlir/IR/BuiltinOps.h"
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#include "mlir/IR/StmtVisitor.h"
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#include "mlir/Pass.h"
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#include "mlir/StandardOps/StandardOps.h"
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#include "mlir/Transforms/Passes.h"
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#include "mlir/Transforms/Utils.h"
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#include "llvm/Support/CommandLine.h"
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using namespace mlir;
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namespace {
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// ComposeAffineMaps walks stmt blocks in an MLFunction, and for each
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// AffineApplyOp, forward substitutes its results into any users which are
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// also AffineApplyOps. After forward subtituting its results, AffineApplyOps
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// with no remaining uses are collected and erased after the walk.
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// TODO(andydavis) Remove this when Chris adds instruction combiner pass.
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struct ComposeAffineMaps : public FunctionPass, StmtWalker<ComposeAffineMaps> {
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std::vector<OperationStmt *> affineApplyOpsToErase;
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explicit ComposeAffineMaps() : FunctionPass(&ComposeAffineMaps::passID) {}
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using StmtListType = llvm::iplist<Statement>;
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void walk(StmtListType::iterator Start, StmtListType::iterator End);
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void visitOperationStmt(OperationStmt *stmt);
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PassResult runOnMLFunction(MLFunction *f) override;
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using StmtWalker<ComposeAffineMaps>::walk;
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static char passID;
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};
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} // end anonymous namespace
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char ComposeAffineMaps::passID = 0;
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FunctionPass *mlir::createComposeAffineMapsPass() {
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return new ComposeAffineMaps();
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}
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void ComposeAffineMaps::walk(StmtListType::iterator Start,
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StmtListType::iterator End) {
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while (Start != End) {
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walk(&(*Start));
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// Increment iterator after walk as visit function can mutate stmt list
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// ahead of 'Start'.
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++Start;
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}
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}
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void ComposeAffineMaps::visitOperationStmt(OperationStmt *opStmt) {
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if (auto affineApplyOp = opStmt->dyn_cast<AffineApplyOp>()) {
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forwardSubstitute(affineApplyOp);
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bool allUsesEmpty = true;
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for (auto *result : affineApplyOp->getOperation()->getResults()) {
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if (!result->use_empty()) {
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allUsesEmpty = false;
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break;
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}
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}
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if (allUsesEmpty) {
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affineApplyOpsToErase.push_back(opStmt);
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}
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}
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}
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PassResult ComposeAffineMaps::runOnMLFunction(MLFunction *f) {
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affineApplyOpsToErase.clear();
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walk(f);
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for (auto *opStmt : affineApplyOpsToErase) {
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opStmt->erase();
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}
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return success();
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}
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static PassRegistration<ComposeAffineMaps> pass("compose-affine-maps",
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"Compose affine maps");
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