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//===- CodegenCleanup.cpp -------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "polly/CodeGen/CodegenCleanup.h"
#include "llvm/Analysis/ScopedNoAliasAA.h"
#include "llvm/Analysis/TypeBasedAliasAnalysis.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Scalar/GVN.h"
#include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h"
#include "llvm/Transforms/Utils.h"
#define DEBUG_TYPE "polly-cleanup"
using namespace llvm;
using namespace polly;
namespace {
class CodegenCleanup final : public FunctionPass {
private:
CodegenCleanup(const CodegenCleanup &) = delete;
const CodegenCleanup &operator=(const CodegenCleanup &) = delete;
llvm::legacy::FunctionPassManager *FPM;
public:
static char ID;
explicit CodegenCleanup() : FunctionPass(ID), FPM(nullptr) {}
/// @name FunctionPass interface
//@{
void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {}
bool doInitialization(Module &M) override {
assert(!FPM);
FPM = new llvm::legacy::FunctionPassManager(&M);
// TODO: How to make parent passes discoverable?
// TODO: Should be sensitive to compiler options in PassManagerBuilder, to
// which we do not have access here.
FPM->add(createScopedNoAliasAAWrapperPass());
FPM->add(createTypeBasedAAWrapperPass());
FPM->add(createAAResultsWrapperPass());
// TODO: These are non-conditional passes that run between
// EP_ModuleOptimizerEarly and EP_VectorizerStart just to ensure we do not
// miss any optimization that would have run after Polly with
// -polly-position=early. This can probably be reduced to a more compact set
// of passes.
FPM->add(createCFGSimplificationPass());
FPM->add(createSROAPass());
FPM->add(createEarlyCSEPass());
FPM->add(createPromoteMemoryToRegisterPass());
FPM->add(createInstructionCombiningPass(true));
FPM->add(createCFGSimplificationPass());
FPM->add(createSROAPass());
FPM->add(createEarlyCSEPass(true));
FPM->add(createSpeculativeExecutionIfHasBranchDivergencePass());
FPM->add(createJumpThreadingPass());
FPM->add(createCorrelatedValuePropagationPass());
FPM->add(createCFGSimplificationPass());
FPM->add(createInstructionCombiningPass(true));
FPM->add(createLibCallsShrinkWrapPass());
FPM->add(createTailCallEliminationPass());
FPM->add(createCFGSimplificationPass());
FPM->add(createReassociatePass());
FPM->add(createLoopRotatePass(-1));
FPM->add(createGVNPass());
FPM->add(createLICMPass());
FPM->add(createSimpleLoopUnswitchLegacyPass());
FPM->add(createCFGSimplificationPass());
FPM->add(createInstructionCombiningPass(true));
FPM->add(createIndVarSimplifyPass());
FPM->add(createLoopIdiomPass());
FPM->add(createLoopDeletionPass());
FPM->add(createCFGSimplificationPass());
FPM->add(createSimpleLoopUnrollPass(3));
FPM->add(createMergedLoadStoreMotionPass());
FPM->add(createGVNPass());
FPM->add(createMemCpyOptPass());
FPM->add(createSCCPPass());
FPM->add(createBitTrackingDCEPass());
FPM->add(createInstructionCombiningPass(true));
FPM->add(createJumpThreadingPass());
FPM->add(createCorrelatedValuePropagationPass());
FPM->add(createDeadStoreEliminationPass());
FPM->add(createLICMPass());
FPM->add(createAggressiveDCEPass());
FPM->add(createCFGSimplificationPass());
FPM->add(createInstructionCombiningPass(true));
FPM->add(createFloat2IntPass());
return FPM->doInitialization();
}
bool doFinalization(Module &M) override {
bool Result = FPM->doFinalization();
delete FPM;
FPM = nullptr;
return Result;
}
bool runOnFunction(llvm::Function &F) override {
if (!F.hasFnAttribute("polly-optimized")) {
LLVM_DEBUG(
dbgs() << F.getName()
<< ": Skipping cleanup because Polly did not optimize it.");
return false;
}
LLVM_DEBUG(dbgs() << F.getName() << ": Running codegen cleanup...");
return FPM->run(F);
}
//@}
};
char CodegenCleanup::ID;
} // namespace
FunctionPass *polly::createCodegenCleanupPass() { return new CodegenCleanup(); }
INITIALIZE_PASS_BEGIN(CodegenCleanup, "polly-cleanup",
"Polly - Cleanup after code generation", false, false)
INITIALIZE_PASS_END(CodegenCleanup, "polly-cleanup",
"Polly - Cleanup after code generation", false, false)
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