1//===- Thumb1RegisterInfo.h - Thumb-1 Register Information Impl -*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains the Thumb-1 implementation of the TargetRegisterInfo
11// class.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef THUMB1REGISTERINFO_H
16#define THUMB1REGISTERINFO_H
17
18#include "ARMBaseRegisterInfo.h"
19#include "llvm/Target/TargetRegisterInfo.h"
20
21namespace llvm {
22  class ARMSubtarget;
23  class ARMBaseInstrInfo;
24
25struct Thumb1RegisterInfo : public ARMBaseRegisterInfo {
26public:
27  Thumb1RegisterInfo(const ARMSubtarget &STI);
28
29  const TargetRegisterClass *
30  getLargestLegalSuperClass(const TargetRegisterClass *RC) const override;
31
32  const TargetRegisterClass *
33  getPointerRegClass(const MachineFunction &MF,
34                     unsigned Kind = 0) const override;
35
36  /// emitLoadConstPool - Emits a load from constpool to materialize the
37  /// specified immediate.
38  void
39  emitLoadConstPool(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
40                    DebugLoc dl, unsigned DestReg, unsigned SubIdx, int Val,
41                    ARMCC::CondCodes Pred = ARMCC::AL, unsigned PredReg = 0,
42                    unsigned MIFlags = MachineInstr::NoFlags) const override;
43
44  // rewrite MI to access 'Offset' bytes from the FP. Update Offset to be
45  // however much remains to be handled. Return 'true' if no further
46  // work is required.
47  bool rewriteFrameIndex(MachineBasicBlock::iterator II, unsigned FrameRegIdx,
48                         unsigned FrameReg, int &Offset,
49                         const ARMBaseInstrInfo &TII) const;
50  void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
51                         int64_t Offset) const override;
52  bool saveScavengerRegister(MachineBasicBlock &MBB,
53                             MachineBasicBlock::iterator I,
54                             MachineBasicBlock::iterator &UseMI,
55                             const TargetRegisterClass *RC,
56                             unsigned Reg) const override;
57  void eliminateFrameIndex(MachineBasicBlock::iterator II,
58                           int SPAdj, unsigned FIOperandNum,
59                           RegScavenger *RS = nullptr) const override;
60};
61}
62
63#endif // THUMB1REGISTERINFO_H
64