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