97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
//===- RegAllocPriorityAdvisor.h - live ranges priority advisor -*- C++ -*-===//
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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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#ifndef LLVM_CODEGEN_REGALLOCPRIORITYADVISOR_H
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#define LLVM_CODEGEN_REGALLOCPRIORITYADVISOR_H
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#include "RegAllocEvictionAdvisor.h"
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#include "llvm/CodeGen/SlotIndexes.h"
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#include "llvm/Pass.h"
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namespace llvm {
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class MachineFunction;
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class VirtRegMap;
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class RAGreedy;
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/// Interface to the priority advisor, which is responsible for prioritizing
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/// live ranges.
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class RegAllocPriorityAdvisor {
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public:
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RegAllocPriorityAdvisor(const RegAllocPriorityAdvisor &) = delete;
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RegAllocPriorityAdvisor(RegAllocPriorityAdvisor &&) = delete;
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virtual ~RegAllocPriorityAdvisor() = default;
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/// Find the priority value for a live range. A float value is used since ML
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/// prefers it.
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virtual unsigned getPriority(const LiveInterval &LI) const = 0;
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RegAllocPriorityAdvisor(const MachineFunction &MF, const RAGreedy &RA,
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SlotIndexes *const Indexes);
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protected:
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const RAGreedy &RA;
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LiveIntervals *const LIS;
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VirtRegMap *const VRM;
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MachineRegisterInfo *const MRI;
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const TargetRegisterInfo *const TRI;
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const RegisterClassInfo &RegClassInfo;
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SlotIndexes *const Indexes;
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const bool RegClassPriorityTrumpsGlobalness;
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const bool ReverseLocalAssignment;
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};
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class DefaultPriorityAdvisor : public RegAllocPriorityAdvisor {
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public:
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DefaultPriorityAdvisor(const MachineFunction &MF, const RAGreedy &RA,
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SlotIndexes *const Indexes)
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: RegAllocPriorityAdvisor(MF, RA, Indexes) {}
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private:
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unsigned getPriority(const LiveInterval &LI) const override;
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};
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class RegAllocPriorityAdvisorAnalysis : public ImmutablePass {
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public:
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enum class AdvisorMode : int { Default, Release, Development };
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RegAllocPriorityAdvisorAnalysis(AdvisorMode Mode)
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: ImmutablePass(ID), Mode(Mode){};
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static char ID;
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/// Get an advisor for the given context (i.e. machine function, etc)
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virtual std::unique_ptr<RegAllocPriorityAdvisor>
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getAdvisor(const MachineFunction &MF, const RAGreedy &RA) = 0;
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AdvisorMode getAdvisorMode() const { return Mode; }
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virtual void logRewardIfNeeded(const MachineFunction &MF,
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llvm::function_ref<float()> GetReward){};
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protected:
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// This analysis preserves everything, and subclasses may have additional
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// requirements.
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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private:
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StringRef getPassName() const override;
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const AdvisorMode Mode;
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};
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/// Specialization for the API used by the analysis infrastructure to create
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/// an instance of the priority advisor.
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template <> Pass *callDefaultCtor<RegAllocPriorityAdvisorAnalysis>();
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RegAllocPriorityAdvisorAnalysis *createReleaseModePriorityAdvisor();
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RegAllocPriorityAdvisorAnalysis *createDevelopmentModePriorityAdvisor();
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} // namespace llvm
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#endif // LLVM_CODEGEN_REGALLOCPRIORITYADVISOR_H
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