Thumb1RegisterInfo.h revision 1d57f4b9260b0e0133e79e4fad874dfaf1739975 
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 class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef THUMB1REGISTERINFO_H
15#define THUMB1REGISTERINFO_H
16
17#include "ARM.h"
18#include "ARMRegisterInfo.h"
19#include "llvm/Target/TargetRegisterInfo.h"
20
21namespace llvm {
22  class ARMSubtarget;
23  class ARMBaseInstrInfo;
24  class Type;
25
26struct Thumb1RegisterInfo : public ARMBaseRegisterInfo {
27public:
28  Thumb1RegisterInfo(const ARMBaseInstrInfo &tii, const ARMSubtarget &STI);
29
30  /// emitLoadConstPool - Emits a load from constpool to materialize the
31  /// specified immediate.
32 void emitLoadConstPool(MachineBasicBlock &MBB,
33                        MachineBasicBlock::iterator &MBBI,
34                        DebugLoc dl,
35                        unsigned DestReg, unsigned SubIdx, int Val,
36                        ARMCC::CondCodes Pred = ARMCC::AL,
37                        unsigned PredReg = 0) const;
38
39  /// Code Generation virtual methods...
40  const TargetRegisterClass *
41    getPhysicalRegisterRegClass(unsigned Reg, EVT VT = MVT::Other) const;
42
43  bool requiresRegisterScavenging(const MachineFunction &MF) const;
44  bool requiresFrameIndexScavenging(const MachineFunction &MF) const;
45
46  bool hasReservedCallFrame(MachineFunction &MF) const;
47
48  void eliminateCallFramePseudoInstr(MachineFunction &MF,
49                                     MachineBasicBlock &MBB,
50                                     MachineBasicBlock::iterator I) const;
51
52  // rewrite MI to access 'Offset' bytes from the FP. Return the offset that
53  // could not be handled directly in MI.
54  int rewriteFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
55                        unsigned FrameReg, int Offset,
56                        unsigned MOVOpc, unsigned ADDriOpc, unsigned SUBriOpc) const;
57
58  bool saveScavengerRegister(MachineBasicBlock &MBB,
59                             MachineBasicBlock::iterator I,
60                             const TargetRegisterClass *RC,
61                             unsigned Reg) const;
62  void restoreScavengerRegister(MachineBasicBlock &MBB,
63                                MachineBasicBlock::iterator I,
64                                const TargetRegisterClass *RC,
65                                unsigned Reg) const;
66  unsigned eliminateFrameIndex(MachineBasicBlock::iterator II,
67                               int SPAdj, int *Value = NULL,
68                               RegScavenger *RS = NULL) const;
69
70  void emitPrologue(MachineFunction &MF) const;
71  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
72};
73}
74
75#endif // THUMB1REGISTERINFO_H
76