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//===---- Canonicalization.cpp - Run canonicalization passes --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Run the set of default canonicalization passes.
//
// This pass is mainly used for debugging.
//
//===----------------------------------------------------------------------===//
#include "polly/Canonicalization.h"
#include "polly/LinkAllPasses.h"
#include "polly/Options.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/FunctionAttrs.h"
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Scalar/EarlyCSE.h"
#include "llvm/Transforms/Scalar/IndVarSimplify.h"
#include "llvm/Transforms/Scalar/LoopRotation.h"
#include "llvm/Transforms/Scalar/Reassociate.h"
#include "llvm/Transforms/Scalar/SimplifyCFG.h"
#include "llvm/Transforms/Scalar/TailRecursionElimination.h"
#include "llvm/Transforms/Utils.h"
#include "llvm/Transforms/Utils/Mem2Reg.h"
using namespace llvm;
using namespace polly;
static cl::opt<bool>
PollyInliner("polly-run-inliner",
cl::desc("Run an early inliner pass before Polly"), cl::Hidden,
cl::cat(PollyCategory));
void polly::registerCanonicalicationPasses(llvm::legacy::PassManagerBase &PM) {
bool UseMemSSA = true;
PM.add(llvm::createPromoteMemoryToRegisterPass());
PM.add(llvm::createEarlyCSEPass(UseMemSSA));
PM.add(llvm::createInstructionCombiningPass());
PM.add(llvm::createCFGSimplificationPass());
PM.add(llvm::createTailCallEliminationPass());
PM.add(llvm::createCFGSimplificationPass());
PM.add(llvm::createReassociatePass());
PM.add(llvm::createLoopRotatePass());
if (PollyInliner) {
PM.add(llvm::createPromoteMemoryToRegisterPass());
PM.add(llvm::createCFGSimplificationPass());
PM.add(llvm::createInstructionCombiningPass());
PM.add(createBarrierNoopPass());
}
PM.add(llvm::createInstructionCombiningPass());
}
/// Adapted from llvm::PassBuilder::buildInlinerPipeline
static ModuleInlinerWrapperPass
buildInlinePasses(llvm::OptimizationLevel Level) {
InlineParams IP = getInlineParams(200);
ModuleInlinerWrapperPass MIWP(IP);
// Require the GlobalsAA analysis for the module so we can query it within
// the CGSCC pipeline.
MIWP.addModulePass(RequireAnalysisPass<GlobalsAA, Module>());
// Invalidate AAManager so it can be recreated and pick up the newly available
// GlobalsAA.
MIWP.addModulePass(
createModuleToFunctionPassAdaptor(InvalidateAnalysisPass<AAManager>()));
// Require the ProfileSummaryAnalysis for the module so we can query it within
// the inliner pass.
MIWP.addModulePass(RequireAnalysisPass<ProfileSummaryAnalysis, Module>());
// Now begin the main postorder CGSCC pipeline.
// FIXME: The current CGSCC pipeline has its origins in the legacy pass
// manager and trying to emulate its precise behavior. Much of this doesn't
// make a lot of sense and we should revisit the core CGSCC structure.
CGSCCPassManager &MainCGPipeline = MIWP.getPM();
// Now deduce any function attributes based in the current code.
MainCGPipeline.addPass(PostOrderFunctionAttrsPass());
return MIWP;
}
FunctionPassManager
polly::buildCanonicalicationPassesForNPM(llvm::ModulePassManager &MPM,
llvm::OptimizationLevel Level) {
FunctionPassManager FPM;
bool UseMemSSA = true;
FPM.addPass(PromotePass());
FPM.addPass(EarlyCSEPass(UseMemSSA));
FPM.addPass(InstCombinePass());
FPM.addPass(SimplifyCFGPass());
FPM.addPass(TailCallElimPass());
FPM.addPass(SimplifyCFGPass());
FPM.addPass(ReassociatePass());
{
LoopPassManager LPM;
LPM.addPass(LoopRotatePass(Level != OptimizationLevel::Oz));
FPM.addPass(createFunctionToLoopPassAdaptor<LoopPassManager>(
std::move(LPM), /*UseMemorySSA=*/false,
/*UseBlockFrequencyInfo=*/false));
}
if (PollyInliner) {
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
MPM.addPass(buildInlinePasses(Level));
FPM = FunctionPassManager();
FPM.addPass(PromotePass());
FPM.addPass(SimplifyCFGPass());
FPM.addPass(InstCombinePass());
}
FPM.addPass(InstCombinePass());
{
LoopPassManager LPM;
LPM.addPass(IndVarSimplifyPass());
FPM.addPass(createFunctionToLoopPassAdaptor<LoopPassManager>(
std::move(LPM), /*UseMemorySSA=*/false,
/*UseBlockFrequencyInfo=*/true));
}
return FPM;
}
namespace {
class PollyCanonicalize final : public ModulePass {
PollyCanonicalize(const PollyCanonicalize &) = delete;
const PollyCanonicalize &operator=(const PollyCanonicalize &) = delete;
public:
static char ID;
explicit PollyCanonicalize() : ModulePass(ID) {}
~PollyCanonicalize();
/// @name FunctionPass interface.
//@{
void getAnalysisUsage(AnalysisUsage &AU) const override;
void releaseMemory() override;
bool runOnModule(Module &M) override;
void print(raw_ostream &OS, const Module *) const override;
//@}
};
} // namespace
PollyCanonicalize::~PollyCanonicalize() {}
void PollyCanonicalize::getAnalysisUsage(AnalysisUsage &AU) const {}
void PollyCanonicalize::releaseMemory() {}
bool PollyCanonicalize::runOnModule(Module &M) {
legacy::PassManager PM;
registerCanonicalicationPasses(PM);
PM.run(M);
return true;
}
void PollyCanonicalize::print(raw_ostream &OS, const Module *) const {}
char PollyCanonicalize::ID = 0;
Pass *polly::createPollyCanonicalizePass() { return new PollyCanonicalize(); }
INITIALIZE_PASS_BEGIN(PollyCanonicalize, "polly-canonicalize",
"Polly - Run canonicalization passes", false, false)
INITIALIZE_PASS_END(PollyCanonicalize, "polly-canonicalize",
"Polly - Run canonicalization passes", false, false)
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