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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
149 lines
4.7 KiB
C++
149 lines
4.7 KiB
C++
//===- lib/Codegen/MachineRegionInfo.cpp ----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineRegionInfo.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Analysis/RegionInfoImpl.h"
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#include "llvm/CodeGen/MachinePostDominators.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#define DEBUG_TYPE "machine-region-info"
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using namespace llvm;
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STATISTIC(numMachineRegions, "The # of machine regions");
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STATISTIC(numMachineSimpleRegions, "The # of simple machine regions");
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namespace llvm {
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template class RegionBase<RegionTraits<MachineFunction>>;
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template class RegionNodeBase<RegionTraits<MachineFunction>>;
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template class RegionInfoBase<RegionTraits<MachineFunction>>;
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} // end namespace llvm
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//===----------------------------------------------------------------------===//
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// MachineRegion implementation
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MachineRegion::MachineRegion(MachineBasicBlock *Entry, MachineBasicBlock *Exit,
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MachineRegionInfo* RI,
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MachineDominatorTree *DT, MachineRegion *Parent) :
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RegionBase<RegionTraits<MachineFunction>>(Entry, Exit, RI, DT, Parent) {}
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MachineRegion::~MachineRegion() = default;
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//===----------------------------------------------------------------------===//
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// MachineRegionInfo implementation
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MachineRegionInfo::MachineRegionInfo() = default;
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MachineRegionInfo::~MachineRegionInfo() = default;
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void MachineRegionInfo::updateStatistics(MachineRegion *R) {
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++numMachineRegions;
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// TODO: Slow. Should only be enabled if -stats is used.
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if (R->isSimple())
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++numMachineSimpleRegions;
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}
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void MachineRegionInfo::recalculate(MachineFunction &F,
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MachineDominatorTree *DT_,
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MachinePostDominatorTree *PDT_,
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MachineDominanceFrontier *DF_) {
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DT = DT_;
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PDT = PDT_;
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DF = DF_;
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MachineBasicBlock *Entry = GraphTraits<MachineFunction*>::getEntryNode(&F);
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TopLevelRegion = new MachineRegion(Entry, nullptr, this, DT, nullptr);
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updateStatistics(TopLevelRegion);
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calculate(F);
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}
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//===----------------------------------------------------------------------===//
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// MachineRegionInfoPass implementation
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//
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MachineRegionInfoPass::MachineRegionInfoPass() : MachineFunctionPass(ID) {
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initializeMachineRegionInfoPassPass(*PassRegistry::getPassRegistry());
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}
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MachineRegionInfoPass::~MachineRegionInfoPass() = default;
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bool MachineRegionInfoPass::runOnMachineFunction(MachineFunction &F) {
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releaseMemory();
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auto DT = &getAnalysis<MachineDominatorTree>();
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auto PDT = &getAnalysis<MachinePostDominatorTree>();
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auto DF = &getAnalysis<MachineDominanceFrontier>();
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RI.recalculate(F, DT, PDT, DF);
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LLVM_DEBUG(RI.dump());
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return false;
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}
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void MachineRegionInfoPass::releaseMemory() {
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RI.releaseMemory();
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}
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void MachineRegionInfoPass::verifyAnalysis() const {
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// Only do verification when user wants to, otherwise this expensive check
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// will be invoked by PMDataManager::verifyPreservedAnalysis when
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// a regionpass (marked PreservedAll) finish.
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if (MachineRegionInfo::VerifyRegionInfo)
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RI.verifyAnalysis();
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}
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void MachineRegionInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<MachineDominatorTree>();
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AU.addRequired<MachinePostDominatorTree>();
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AU.addRequired<MachineDominanceFrontier>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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void MachineRegionInfoPass::print(raw_ostream &OS, const Module *) const {
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RI.print(OS);
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void MachineRegionInfoPass::dump() const {
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RI.dump();
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}
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#endif
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char MachineRegionInfoPass::ID = 0;
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char &MachineRegionInfoPassID = MachineRegionInfoPass::ID;
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INITIALIZE_PASS_BEGIN(MachineRegionInfoPass, DEBUG_TYPE,
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"Detect single entry single exit regions", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
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INITIALIZE_PASS_DEPENDENCY(MachinePostDominatorTree)
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INITIALIZE_PASS_DEPENDENCY(MachineDominanceFrontier)
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INITIALIZE_PASS_END(MachineRegionInfoPass, DEBUG_TYPE,
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"Detect single entry single exit regions", true, true)
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// Create methods available outside of this file, to use them
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// "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by
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// the link time optimization.
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namespace llvm {
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FunctionPass *createMachineRegionInfoPass() {
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return new MachineRegionInfoPass();
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}
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} // end namespace llvm
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