Thumb1InstrInfo.cpp revision c01810eeb7227010f73cb39e3c4fa0197a3c4ef0 
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 "ARMMachineFunctionInfo.h"
17#include "llvm/CodeGen/MachineFrameInfo.h"
18#include "llvm/CodeGen/MachineInstrBuilder.h"
19#include "llvm/CodeGen/MachineRegisterInfo.h"
20#include "llvm/CodeGen/MachineMemOperand.h"
21#include "llvm/ADT/SmallVector.h"
22#include "llvm/MC/MCInst.h"
23
24using namespace llvm;
25
26Thumb1InstrInfo::Thumb1InstrInfo(const ARMSubtarget &STI)
27  : ARMBaseInstrInfo(STI), RI(*this, STI) {
28}
29
30/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
31void Thumb1InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
32  NopInst.setOpcode(ARM::tMOVr);
33  NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
34  NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
35  NopInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
36  NopInst.addOperand(MCOperand::CreateReg(0));
37}
38
39unsigned Thumb1InstrInfo::getUnindexedOpcode(unsigned Opc) const {
40  return 0;
41}
42
43void Thumb1InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
44                                  MachineBasicBlock::iterator I, DebugLoc DL,
45                                  unsigned DestReg, unsigned SrcReg,
46                                  bool KillSrc) const {
47  AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg)
48    .addReg(SrcReg, getKillRegState(KillSrc)));
49  assert(ARM::GPRRegClass.contains(DestReg, SrcReg) &&
50         "Thumb1 can only copy GPR registers");
51}
52
53void Thumb1InstrInfo::
54storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
55                    unsigned SrcReg, bool isKill, int FI,
56                    const TargetRegisterClass *RC,
57                    const TargetRegisterInfo *TRI) const {
58  assert((RC == ARM::tGPRRegisterClass ||
59          (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
60           isARMLowRegister(SrcReg))) && "Unknown regclass!");
61
62  if (RC == ARM::tGPRRegisterClass ||
63      (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
64       isARMLowRegister(SrcReg))) {
65    DebugLoc DL;
66    if (I != MBB.end()) DL = I->getDebugLoc();
67
68    MachineFunction &MF = *MBB.getParent();
69    MachineFrameInfo &MFI = *MF.getFrameInfo();
70    MachineMemOperand *MMO =
71      MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
72                              MachineMemOperand::MOStore,
73                              MFI.getObjectSize(FI),
74                              MFI.getObjectAlignment(FI));
75    AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSTRspi))
76                   .addReg(SrcReg, getKillRegState(isKill))
77                   .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
78  }
79}
80
81void Thumb1InstrInfo::
82loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
83                     unsigned DestReg, int FI,
84                     const TargetRegisterClass *RC,
85                     const TargetRegisterInfo *TRI) const {
86  assert((RC == ARM::tGPRRegisterClass ||
87          (TargetRegisterInfo::isPhysicalRegister(DestReg) &&
88           isARMLowRegister(DestReg))) && "Unknown regclass!");
89
90  if (RC == ARM::tGPRRegisterClass ||
91      (TargetRegisterInfo::isPhysicalRegister(DestReg) &&
92       isARMLowRegister(DestReg))) {
93    DebugLoc DL;
94    if (I != MBB.end()) DL = I->getDebugLoc();
95
96    MachineFunction &MF = *MBB.getParent();
97    MachineFrameInfo &MFI = *MF.getFrameInfo();
98    MachineMemOperand *MMO =
99      MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
100                              MachineMemOperand::MOLoad,
101                              MFI.getObjectSize(FI),
102                              MFI.getObjectAlignment(FI));
103    AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tLDRspi), DestReg)
104                   .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
105  }
106}
107