4bb31f7377
A recent change introduced a possibility to run LLVM IR transformation during
JIT-compilation in the ExecutionEngine. Provide helper functions that
construct IR transformers given either clang-style optimization levels or a
list passes to run. The latter wraps the LLVM command line option parser to
parse strings rather than actual command line arguments. As a result, we can
run either of
mlir-cpu-runner -O3 input.mlir
mlir-cpu-runner -some-mlir-pass -llvm-opts="-llvm-pass -other-llvm-pass"
to combine different transformations. The transformer builder functions are
provided as a separate library that depends on LLVM pass libraries unlike the
main execution engine library. The library can be used for integrating MLIR
execution engine into external frameworks.
PiperOrigin-RevId: 234173493
119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
//===- OptUtils.cpp - MLIR Execution Engine optimization pass utilities ---===//
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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 the utility functions to trigger LLVM optimizations from
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// MLIR Execution Engine.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/ExecutionEngine/OptUtils.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/LegacyPassNameParser.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/StringSaver.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include <mutex>
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// Run the module and function passes managed by the module manager.
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static void runPasses(llvm::legacy::PassManager &modulePM,
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llvm::legacy::FunctionPassManager &funcPM,
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llvm::Module &m) {
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for (auto &func : m) {
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funcPM.run(func);
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}
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modulePM.run(m);
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}
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// Initialize basic LLVM transformation passes under lock.
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void mlir::initializeLLVMPasses() {
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static std::mutex mutex;
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std::lock_guard<std::mutex> lock(mutex);
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auto ®istry = *llvm::PassRegistry::getPassRegistry();
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llvm::initializeCore(registry);
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llvm::initializeTransformUtils(registry);
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llvm::initializeScalarOpts(registry);
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llvm::initializeIPO(registry);
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llvm::initializeInstCombine(registry);
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llvm::initializeAggressiveInstCombine(registry);
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llvm::initializeAnalysis(registry);
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llvm::initializeVectorization(registry);
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}
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// Create and return a lambda that uses LLVM pass manager builder to set up
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// optimizations based on the given level.
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std::function<llvm::Error(llvm::Module *)>
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mlir::makeOptimizingTransformer(unsigned optLevel, unsigned sizeLevel) {
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return [optLevel, sizeLevel](llvm::Module *m) -> llvm::Error {
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llvm::PassManagerBuilder builder;
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builder.OptLevel = optLevel;
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builder.SizeLevel = sizeLevel;
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builder.Inliner = llvm::createFunctionInliningPass(
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optLevel, sizeLevel, /*DisableInlineHotCallSite=*/false);
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llvm::legacy::PassManager modulePM;
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llvm::legacy::FunctionPassManager funcPM(m);
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builder.populateModulePassManager(modulePM);
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builder.populateFunctionPassManager(funcPM);
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runPasses(modulePM, funcPM, *m);
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return llvm::Error::success();
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};
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}
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// Create and return a lambda that leverages LLVM PassInfo command line parser
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// to construct passes given the command line flags that come from the given
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// string rather than from the command line.
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std::function<llvm::Error(llvm::Module *)>
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mlir::makeLLVMPassesTransformer(std::string config) {
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return [config](llvm::Module *m) -> llvm::Error {
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static llvm::cl::list<const llvm::PassInfo *, bool, llvm::PassNameParser>
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llvmPasses(llvm::cl::desc("LLVM optimizing passes to run"));
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llvm::BumpPtrAllocator allocator;
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llvm::StringSaver saver(allocator);
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llvm::SmallVector<const char *, 16> args;
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args.push_back(""); // inject dummy program name
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llvm::cl::TokenizeGNUCommandLine(config, saver, args);
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llvm::cl::ParseCommandLineOptions(args.size(), args.data());
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llvm::legacy::PassManager modulePM;
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for (const auto *passInfo : llvmPasses) {
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if (!passInfo->getNormalCtor())
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continue;
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auto *pass = passInfo->createPass();
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if (!pass)
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return llvm::make_error<llvm::StringError>(
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"could not create pass " + passInfo->getPassName(),
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llvm::inconvertibleErrorCode());
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modulePM.add(pass);
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}
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modulePM.run(*m);
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return llvm::Error::success();
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};
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}
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