Thumb1RegisterInfo.h revision 57148c166ab232191098492633c924fad9c44ef3 
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 "ARM.h"
19#include "ARMBaseRegisterInfo.h"
20#include "llvm/Target/TargetRegisterInfo.h"
21
22namespace llvm {
23  class ARMSubtarget;
24  class ARMBaseInstrInfo;
25
26struct Thumb1RegisterInfo : public ARMBaseRegisterInfo {
27public:
28  Thumb1RegisterInfo(const ARMSubtarget &STI);
29
30  const TargetRegisterClass*
31  getLargestLegalSuperClass(const TargetRegisterClass *RC) const;
32
33  const TargetRegisterClass*
34  getPointerRegClass(const MachineFunction &MF, unsigned Kind = 0) const;
35
36  /// emitLoadConstPool - Emits a load from constpool to materialize the
37  /// specified immediate.
38 void emitLoadConstPool(MachineBasicBlock &MBB,
39                        MachineBasicBlock::iterator &MBBI,
40                        DebugLoc dl,
41                        unsigned DestReg, unsigned SubIdx, int Val,
42                        ARMCC::CondCodes Pred = ARMCC::AL,
43                        unsigned PredReg = 0,
44                        unsigned MIFlags = MachineInstr::NoFlags) const;
45
46  // rewrite MI to access 'Offset' bytes from the FP. Update Offset to be
47  // however much remains to be handled. Return 'true' if no further
48  // work is required.
49  bool rewriteFrameIndex(MachineBasicBlock::iterator II, unsigned FrameRegIdx,
50                         unsigned FrameReg, int &Offset,
51                         const ARMBaseInstrInfo &TII) const;
52  void resolveFrameIndex(MachineBasicBlock::iterator I,
53                         unsigned BaseReg, int64_t Offset) const;
54  bool saveScavengerRegister(MachineBasicBlock &MBB,
55                             MachineBasicBlock::iterator I,
56                             MachineBasicBlock::iterator &UseMI,
57                             const TargetRegisterClass *RC,
58                             unsigned Reg) const;
59  void eliminateFrameIndex(MachineBasicBlock::iterator II,
60                           int SPAdj, unsigned FIOperandNum,
61                           RegScavenger *RS = NULL) const;
62};
63}
64
65#endif // THUMB1REGISTERINFO_H
66