ThumbRegisterInfo.h

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//===- ThumbRegisterInfo.h - Thumb Register Information Impl -*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains the Thumb implementation of the TargetRegisterInfo
// class. With the exception of emitLoadConstPool Thumb2 tracks
// ARMBaseRegisterInfo, Thumb1 overloads the functions below.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_ARM_THUMB1REGISTERINFO_H
#define LLVM_LIB_TARGET_ARM_THUMB1REGISTERINFO_H
 
#include "ARMBaseRegisterInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
 
namespace llvm {
  class ARMSubtarget;
  class ARMBaseInstrInfo;
 
struct ThumbRegisterInfo : public ARMBaseRegisterInfo {
private:
  const bool IsThumb1Only;
 
public:
  explicit ThumbRegisterInfo(const ARMSubtarget &STI);
 
  const TargetRegisterClass *
  getLargestLegalSuperClass(const TargetRegisterClass *RC,
                            const MachineFunction &MF) const override;
 
  /// emitLoadConstPool - Emits a load from constpool to materialize the
  /// specified immediate.
  void
  emitLoadConstPool(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
                    const DebugLoc &dl, Register DestReg, unsigned SubIdx,
                    int Val, ARMCC::CondCodes Pred = ARMCC::AL,
                    Register PredReg = Register(),
                    unsigned MIFlags = MachineInstr::NoFlags) const override;
 
  // rewrite MI to access 'Offset' bytes from the FP. Update Offset to be
  // however much remains to be handled. Return 'true' if no further
  // work is required.
  bool rewriteFrameIndex(MachineBasicBlock::iterator II, unsigned FrameRegIdx,
                         Register FrameReg, int &Offset,
                         const ARMBaseInstrInfo &TII) const;
  void resolveFrameIndex(MachineInstr &MI, Register BaseReg,
                         int64_t Offset) const override;
  bool eliminateFrameIndex(MachineBasicBlock::iterator II,
                           int SPAdj, unsigned FIOperandNum,
                           RegScavenger *RS = nullptr) const override;
  bool useFPForScavengingIndex(const MachineFunction &MF) const override;
};
}
 
#endif