Thumb1RegisterInfo.h revision 212904 
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 "ARMRegisterInfo.h"
20#include "llvm/Target/TargetRegisterInfo.h"
21
22namespace llvm {
23  class ARMSubtarget;
24  class ARMBaseInstrInfo;
25  class Type;
26
27struct Thumb1RegisterInfo : public ARMBaseRegisterInfo {
28public:
29  Thumb1RegisterInfo(const ARMBaseInstrInfo &tii, const ARMSubtarget &STI);
30
31  /// emitLoadConstPool - Emits a load from constpool to materialize the
32  /// specified immediate.
33 void emitLoadConstPool(MachineBasicBlock &MBB,
34                        MachineBasicBlock::iterator &MBBI,
35                        DebugLoc dl,
36                        unsigned DestReg, unsigned SubIdx, int Val,
37                        ARMCC::CondCodes Pred = ARMCC::AL,
38                        unsigned PredReg = 0) const;
39
40  /// Code Generation virtual methods...
41  bool hasReservedCallFrame(const MachineFunction &MF) const;
42
43  void eliminateCallFramePseudoInstr(MachineFunction &MF,
44                                     MachineBasicBlock &MBB,
45                                     MachineBasicBlock::iterator I) const;
46
47  // rewrite MI to access 'Offset' bytes from the FP. Update Offset to be
48  // however much remains to be handled. Return 'true' if no further
49  // work is required.
50  bool rewriteFrameIndex(MachineBasicBlock::iterator II, unsigned FrameRegIdx,
51                         unsigned FrameReg, int &Offset,
52                         const ARMBaseInstrInfo &TII) const;
53  void resolveFrameIndex(MachineBasicBlock::iterator I,
54                         unsigned BaseReg, int64_t Offset) const;
55  bool saveScavengerRegister(MachineBasicBlock &MBB,
56                             MachineBasicBlock::iterator I,
57                             MachineBasicBlock::iterator &UseMI,
58                             const TargetRegisterClass *RC,
59                             unsigned Reg) const;
60  void eliminateFrameIndex(MachineBasicBlock::iterator II,
61                           int SPAdj, RegScavenger *RS = NULL) const;
62
63  void emitPrologue(MachineFunction &MF) const;
64  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
65};
66}
67
68#endif // THUMB1REGISTERINFO_H
69