Thumb1InstrInfo.cpp revision 4e02f23de24375294005f88b5254a3775d39fcb2 
1//===-- Thumb1InstrInfo.cpp - Thumb-1 Instruction Information -------------===//
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 TargetInstrInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Thumb1InstrInfo.h"
15#include "ARM.h"
16#include "llvm/CodeGen/MachineFrameInfo.h"
17#include "llvm/CodeGen/MachineInstrBuilder.h"
18#include "llvm/CodeGen/MachineRegisterInfo.h"
19#include "llvm/CodeGen/MachineMemOperand.h"
20#include "llvm/MC/MCInst.h"
21
22using namespace llvm;
23
24Thumb1InstrInfo::Thumb1InstrInfo(const ARMSubtarget &STI)
25  : ARMBaseInstrInfo(STI), RI(*this, STI) {
26}
27
28/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
29void Thumb1InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
30  NopInst.setOpcode(ARM::tMOVr);
31  NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
32  NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
33  NopInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
34  NopInst.addOperand(MCOperand::CreateReg(0));
35}
36
37unsigned Thumb1InstrInfo::getUnindexedOpcode(unsigned Opc) const {
38  return 0;
39}
40
41void Thumb1InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
42                                  MachineBasicBlock::iterator I, DebugLoc DL,
43                                  unsigned DestReg, unsigned SrcReg,
44                                  bool KillSrc) const {
45  AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg)
46    .addReg(SrcReg, getKillRegState(KillSrc)));
47  assert(ARM::GPRRegClass.contains(DestReg, SrcReg) &&
48         "Thumb1 can only copy GPR registers");
49}
50
51void Thumb1InstrInfo::
52storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
53                    unsigned SrcReg, bool isKill, int FI,
54                    const TargetRegisterClass *RC,
55                    const TargetRegisterInfo *TRI) const {
56  assert((RC == ARM::tGPRRegisterClass ||
57          (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
58           isARMLowRegister(SrcReg))) && "Unknown regclass!");
59
60  if (RC == ARM::tGPRRegisterClass ||
61      (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
62       isARMLowRegister(SrcReg))) {
63    DebugLoc DL;
64    if (I != MBB.end()) DL = I->getDebugLoc();
65
66    MachineFunction &MF = *MBB.getParent();
67    MachineFrameInfo &MFI = *MF.getFrameInfo();
68    MachineMemOperand *MMO =
69      MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
70                              MachineMemOperand::MOStore,
71                              MFI.getObjectSize(FI),
72                              MFI.getObjectAlignment(FI));
73    AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSTRspi))
74                   .addReg(SrcReg, getKillRegState(isKill))
75                   .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
76  }
77}
78
79void Thumb1InstrInfo::
80loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
81                     unsigned DestReg, int FI,
82                     const TargetRegisterClass *RC,
83                     const TargetRegisterInfo *TRI) const {
84  assert((RC == ARM::tGPRRegisterClass ||
85          (TargetRegisterInfo::isPhysicalRegister(DestReg) &&
86           isARMLowRegister(DestReg))) && "Unknown regclass!");
87
88  if (RC == ARM::tGPRRegisterClass ||
89      (TargetRegisterInfo::isPhysicalRegister(DestReg) &&
90       isARMLowRegister(DestReg))) {
91    DebugLoc DL;
92    if (I != MBB.end()) DL = I->getDebugLoc();
93
94    MachineFunction &MF = *MBB.getParent();
95    MachineFrameInfo &MFI = *MF.getFrameInfo();
96    MachineMemOperand *MMO =
97      MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
98                              MachineMemOperand::MOLoad,
99                              MFI.getObjectSize(FI),
100                              MFI.getObjectAlignment(FI));
101    AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tLDRspi), DestReg)
102                   .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
103  }
104}
105