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//===-- llvm/CodeGen/TailDuplicator.h ---------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the TailDuplicator class. Used by the
// TailDuplication pass, and MachineBlockPlacement.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_TAILDUPLICATOR_H
#define LLVM_CODEGEN_TAILDUPLICATOR_H
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/MachineSSAUpdater.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
namespace llvm {
/// Utility class to perform tail duplication.
class TailDuplicator {
const TargetInstrInfo *TII;
const TargetRegisterInfo *TRI;
const MachineBranchProbabilityInfo *MBPI;
const MachineModuleInfo *MMI;
MachineRegisterInfo *MRI;
bool PreRegAlloc;
// A list of virtual registers for which to update SSA form.
SmallVector<unsigned, 16> SSAUpdateVRs;
// For each virtual register in SSAUpdateVals keep a list of source virtual
// registers.
typedef std::vector<std::pair<MachineBasicBlock *, unsigned>> AvailableValsTy;
DenseMap<unsigned, AvailableValsTy> SSAUpdateVals;
public:
void initMF(MachineFunction &MF, const MachineModuleInfo *MMI,
const MachineBranchProbabilityInfo *MBPI);
bool tailDuplicateBlocks(MachineFunction &MF);
static bool isSimpleBB(MachineBasicBlock *TailBB);
bool shouldTailDuplicate(const MachineFunction &MF, bool IsSimple,
MachineBasicBlock &TailBB);
bool tailDuplicateAndUpdate(MachineFunction &MF, bool IsSimple,
MachineBasicBlock *MBB);
private:
typedef TargetInstrInfo::RegSubRegPair RegSubRegPair;
void addSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
MachineBasicBlock *BB);
void processPHI(MachineInstr *MI, MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB,
DenseMap<unsigned, RegSubRegPair> &LocalVRMap,
SmallVectorImpl<std::pair<unsigned, RegSubRegPair>> &Copies,
const DenseSet<unsigned> &UsedByPhi, bool Remove);
void duplicateInstruction(MachineInstr *MI, MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB, MachineFunction &MF,
DenseMap<unsigned, RegSubRegPair> &LocalVRMap,
const DenseSet<unsigned> &UsedByPhi);
void updateSuccessorsPHIs(MachineBasicBlock *FromBB, bool isDead,
SmallVectorImpl<MachineBasicBlock *> &TDBBs,
SmallSetVector<MachineBasicBlock *, 8> &Succs);
bool canCompletelyDuplicateBB(MachineBasicBlock &BB);
bool duplicateSimpleBB(MachineBasicBlock *TailBB,
SmallVectorImpl<MachineBasicBlock *> &TDBBs,
const DenseSet<unsigned> &RegsUsedByPhi,
SmallVectorImpl<MachineInstr *> &Copies);
bool tailDuplicate(MachineFunction &MF, bool IsSimple,
MachineBasicBlock *TailBB,
SmallVectorImpl<MachineBasicBlock *> &TDBBs,
SmallVectorImpl<MachineInstr *> &Copies);
void appendCopies(MachineBasicBlock *MBB,
SmallVectorImpl<std::pair<unsigned,RegSubRegPair>> &CopyInfos,
SmallVectorImpl<MachineInstr *> &Copies);
void removeDeadBlock(MachineBasicBlock *MBB);
};
} // End llvm namespace
#endif
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