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128 lines
5.1 KiB
C++
128 lines
5.1 KiB
C++
//===- llvm/CodeGen/TailDuplicator.h ----------------------------*- 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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//
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// This file defines the TailDuplicator class. Used by the
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// TailDuplication pass, and MachineBlockPlacement.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_TAILDUPLICATOR_H
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#define LLVM_CODEGEN_TAILDUPLICATOR_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include <utility>
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#include <vector>
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namespace llvm {
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class MachineBasicBlock;
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class MachineBranchProbabilityInfo;
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class MachineFunction;
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class MachineInstr;
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class MachineModuleInfo;
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class MachineRegisterInfo;
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class TargetRegisterInfo;
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/// Utility class to perform tail duplication.
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class TailDuplicator {
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const TargetInstrInfo *TII;
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const TargetRegisterInfo *TRI;
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const MachineBranchProbabilityInfo *MBPI;
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const MachineModuleInfo *MMI;
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MachineRegisterInfo *MRI;
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MachineFunction *MF;
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bool PreRegAlloc;
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bool LayoutMode;
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unsigned TailDupSize;
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// A list of virtual registers for which to update SSA form.
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SmallVector<unsigned, 16> SSAUpdateVRs;
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// For each virtual register in SSAUpdateVals keep a list of source virtual
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// registers.
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using AvailableValsTy = std::vector<std::pair<MachineBasicBlock *, unsigned>>;
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DenseMap<unsigned, AvailableValsTy> SSAUpdateVals;
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public:
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/// Prepare to run on a specific machine function.
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/// @param MF - Function that will be processed
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/// @param PreRegAlloc - true if used before register allocation
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/// @param MBPI - Branch Probability Info. Used to propagate correct
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/// probabilities when modifying the CFG.
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/// @param LayoutMode - When true, don't use the existing layout to make
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/// decisions.
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/// @param TailDupSize - Maxmimum size of blocks to tail-duplicate. Zero
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/// default implies using the command line value TailDupSize.
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void initMF(MachineFunction &MF, bool PreRegAlloc,
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const MachineBranchProbabilityInfo *MBPI,
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bool LayoutMode, unsigned TailDupSize = 0);
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bool tailDuplicateBlocks();
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static bool isSimpleBB(MachineBasicBlock *TailBB);
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bool shouldTailDuplicate(bool IsSimple, MachineBasicBlock &TailBB);
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/// Returns true if TailBB can successfully be duplicated into PredBB
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bool canTailDuplicate(MachineBasicBlock *TailBB, MachineBasicBlock *PredBB);
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/// Tail duplicate a single basic block into its predecessors, and then clean
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/// up.
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/// If \p DuplicatePreds is not null, it will be updated to contain the list
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/// of predecessors that received a copy of \p MBB.
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/// If \p RemovalCallback is non-null. It will be called before MBB is
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/// deleted.
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bool tailDuplicateAndUpdate(
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bool IsSimple, MachineBasicBlock *MBB,
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MachineBasicBlock *ForcedLayoutPred,
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SmallVectorImpl<MachineBasicBlock*> *DuplicatedPreds = nullptr,
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function_ref<void(MachineBasicBlock *)> *RemovalCallback = nullptr);
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private:
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using RegSubRegPair = TargetInstrInfo::RegSubRegPair;
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void addSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
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MachineBasicBlock *BB);
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void processPHI(MachineInstr *MI, MachineBasicBlock *TailBB,
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MachineBasicBlock *PredBB,
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DenseMap<unsigned, RegSubRegPair> &LocalVRMap,
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SmallVectorImpl<std::pair<unsigned, RegSubRegPair>> &Copies,
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const DenseSet<unsigned> &UsedByPhi, bool Remove);
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void duplicateInstruction(MachineInstr *MI, MachineBasicBlock *TailBB,
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MachineBasicBlock *PredBB,
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DenseMap<unsigned, RegSubRegPair> &LocalVRMap,
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const DenseSet<unsigned> &UsedByPhi);
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void updateSuccessorsPHIs(MachineBasicBlock *FromBB, bool isDead,
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SmallVectorImpl<MachineBasicBlock *> &TDBBs,
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SmallSetVector<MachineBasicBlock *, 8> &Succs);
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bool canCompletelyDuplicateBB(MachineBasicBlock &BB);
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bool duplicateSimpleBB(MachineBasicBlock *TailBB,
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SmallVectorImpl<MachineBasicBlock *> &TDBBs,
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const DenseSet<unsigned> &RegsUsedByPhi,
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SmallVectorImpl<MachineInstr *> &Copies);
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bool tailDuplicate(bool IsSimple,
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MachineBasicBlock *TailBB,
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MachineBasicBlock *ForcedLayoutPred,
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SmallVectorImpl<MachineBasicBlock *> &TDBBs,
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SmallVectorImpl<MachineInstr *> &Copies);
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void appendCopies(MachineBasicBlock *MBB,
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SmallVectorImpl<std::pair<unsigned,RegSubRegPair>> &CopyInfos,
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SmallVectorImpl<MachineInstr *> &Copies);
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void removeDeadBlock(
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MachineBasicBlock *MBB,
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function_ref<void(MachineBasicBlock *)> *RemovalCallback = nullptr);
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_TAILDUPLICATOR_H
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