1 //===- Thumb1InstrInfo.cpp - Thumb-1 Instruction Information --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the Thumb-1 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "ARMInstrInfo.h"
16 #include "ARMGenInstrInfo.inc"
17 #include "ARMMachineFunctionInfo.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "Thumb1InstrInfo.h"
25 Thumb1InstrInfo::Thumb1InstrInfo(const ARMSubtarget &STI)
26 : ARMBaseInstrInfo(STI), RI(*this, STI) {
29 unsigned Thumb1InstrInfo::getUnindexedOpcode(unsigned Opc) const {
33 unsigned Thumb1InstrInfo::getOpcode(ARMII::Op Op) const {
35 case ARMII::ADDri: return ARM::tADDi8;
36 case ARMII::ADDrs: return 0;
37 case ARMII::ADDrr: return ARM::tADDrr;
38 case ARMII::B: return ARM::tB;
39 case ARMII::Bcc: return ARM::tBcc;
40 case ARMII::BR_JTr: return ARM::tBR_JTr;
41 case ARMII::BR_JTm: return 0;
42 case ARMII::BR_JTadd: return 0;
43 case ARMII::BX_RET: return ARM::tBX_RET;
44 case ARMII::LDRrr: return ARM::tLDR;
45 case ARMII::LDRri: return 0;
46 case ARMII::MOVr: return ARM::tMOVr;
47 case ARMII::STRrr: return ARM::tSTR;
48 case ARMII::STRri: return 0;
49 case ARMII::SUBri: return ARM::tSUBi8;
50 case ARMII::SUBrs: return 0;
51 case ARMII::SUBrr: return ARM::tSUBrr;
60 Thumb1InstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
61 if (MBB.empty()) return false;
63 switch (MBB.back().getOpcode()) {
65 case ARM::tBX_RET_vararg:
77 bool Thumb1InstrInfo::isMoveInstr(const MachineInstr &MI,
78 unsigned &SrcReg, unsigned &DstReg,
79 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
80 SrcSubIdx = DstSubIdx = 0; // No sub-registers.
82 unsigned oc = MI.getOpcode();
87 case ARM::tMOVhir2lor:
88 case ARM::tMOVlor2hir:
89 case ARM::tMOVhir2hir:
90 assert(MI.getDesc().getNumOperands() >= 2 &&
91 MI.getOperand(0).isReg() &&
92 MI.getOperand(1).isReg() &&
93 "Invalid Thumb MOV instruction");
94 SrcReg = MI.getOperand(1).getReg();
95 DstReg = MI.getOperand(0).getReg();
100 unsigned Thumb1InstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
101 int &FrameIndex) const {
102 switch (MI->getOpcode()) {
105 if (MI->getOperand(1).isFI() &&
106 MI->getOperand(2).isImm() &&
107 MI->getOperand(2).getImm() == 0) {
108 FrameIndex = MI->getOperand(1).getIndex();
109 return MI->getOperand(0).getReg();
116 unsigned Thumb1InstrInfo::isStoreToStackSlot(const MachineInstr *MI,
117 int &FrameIndex) const {
118 switch (MI->getOpcode()) {
121 if (MI->getOperand(1).isFI() &&
122 MI->getOperand(2).isImm() &&
123 MI->getOperand(2).getImm() == 0) {
124 FrameIndex = MI->getOperand(1).getIndex();
125 return MI->getOperand(0).getReg();
132 bool Thumb1InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
133 MachineBasicBlock::iterator I,
134 unsigned DestReg, unsigned SrcReg,
135 const TargetRegisterClass *DestRC,
136 const TargetRegisterClass *SrcRC) const {
137 DebugLoc DL = DebugLoc::getUnknownLoc();
138 if (I != MBB.end()) DL = I->getDebugLoc();
140 if (DestRC == ARM::GPRRegisterClass) {
141 if (SrcRC == ARM::GPRRegisterClass) {
142 BuildMI(MBB, I, DL, get(ARM::tMOVhir2hir), DestReg).addReg(SrcReg);
144 } else if (SrcRC == ARM::tGPRRegisterClass) {
145 BuildMI(MBB, I, DL, get(ARM::tMOVlor2hir), DestReg).addReg(SrcReg);
148 } else if (DestRC == ARM::tGPRRegisterClass) {
149 if (SrcRC == ARM::GPRRegisterClass) {
150 BuildMI(MBB, I, DL, get(ARM::tMOVhir2lor), DestReg).addReg(SrcReg);
152 } else if (SrcRC == ARM::tGPRRegisterClass) {
153 BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg).addReg(SrcReg);
161 bool Thumb1InstrInfo::
162 canFoldMemoryOperand(const MachineInstr *MI,
163 const SmallVectorImpl<unsigned> &Ops) const {
164 if (Ops.size() != 1) return false;
166 unsigned OpNum = Ops[0];
167 unsigned Opc = MI->getOpcode();
171 case ARM::tMOVlor2hir:
172 case ARM::tMOVhir2lor:
173 case ARM::tMOVhir2hir: {
174 if (OpNum == 0) { // move -> store
175 unsigned SrcReg = MI->getOperand(1).getReg();
176 if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
177 // tSpill cannot take a high register operand.
179 } else { // move -> load
180 unsigned DstReg = MI->getOperand(0).getReg();
181 if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
182 // tRestore cannot target a high register operand.
192 void Thumb1InstrInfo::
193 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
194 unsigned SrcReg, bool isKill, int FI,
195 const TargetRegisterClass *RC) const {
196 DebugLoc DL = DebugLoc::getUnknownLoc();
197 if (I != MBB.end()) DL = I->getDebugLoc();
199 assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
201 if (RC == ARM::tGPRRegisterClass) {
202 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSpill))
203 .addReg(SrcReg, getKillRegState(isKill))
204 .addFrameIndex(FI).addImm(0));
208 void Thumb1InstrInfo::
209 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
210 unsigned DestReg, int FI,
211 const TargetRegisterClass *RC) const {
212 DebugLoc DL = DebugLoc::getUnknownLoc();
213 if (I != MBB.end()) DL = I->getDebugLoc();
215 assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
217 if (RC == ARM::tGPRRegisterClass) {
218 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tRestore), DestReg)
219 .addFrameIndex(FI).addImm(0));
223 bool Thumb1InstrInfo::
224 spillCalleeSavedRegisters(MachineBasicBlock &MBB,
225 MachineBasicBlock::iterator MI,
226 const std::vector<CalleeSavedInfo> &CSI) const {
230 DebugLoc DL = DebugLoc::getUnknownLoc();
231 if (MI != MBB.end()) DL = MI->getDebugLoc();
233 MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, get(ARM::tPUSH));
234 for (unsigned i = CSI.size(); i != 0; --i) {
235 unsigned Reg = CSI[i-1].getReg();
236 // Add the callee-saved register as live-in. It's killed at the spill.
238 MIB.addReg(Reg, RegState::Kill);
243 bool Thumb1InstrInfo::
244 restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
245 MachineBasicBlock::iterator MI,
246 const std::vector<CalleeSavedInfo> &CSI) const {
247 MachineFunction &MF = *MBB.getParent();
248 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
252 bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
253 MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
254 for (unsigned i = CSI.size(); i != 0; --i) {
255 unsigned Reg = CSI[i-1].getReg();
256 if (Reg == ARM::LR) {
257 // Special epilogue for vararg functions. See emitEpilogue
261 PopMI->setDesc(get(ARM::tPOP_RET));
264 PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
267 // It's illegal to emit pop instruction without operands.
268 if (PopMI->getNumOperands() > 0)
269 MBB.insert(MI, PopMI);
274 MachineInstr *Thumb1InstrInfo::
275 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
276 const SmallVectorImpl<unsigned> &Ops, int FI) const {
277 if (Ops.size() != 1) return NULL;
279 unsigned OpNum = Ops[0];
280 unsigned Opc = MI->getOpcode();
281 MachineInstr *NewMI = NULL;
285 case ARM::tMOVlor2hir:
286 case ARM::tMOVhir2lor:
287 case ARM::tMOVhir2hir: {
288 if (OpNum == 0) { // move -> store
289 unsigned SrcReg = MI->getOperand(1).getReg();
290 bool isKill = MI->getOperand(1).isKill();
291 if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
292 // tSpill cannot take a high register operand.
294 NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
295 .addReg(SrcReg, getKillRegState(isKill))
296 .addFrameIndex(FI).addImm(0));
297 } else { // move -> load
298 unsigned DstReg = MI->getOperand(0).getReg();
299 if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
300 // tRestore cannot target a high register operand.
302 bool isDead = MI->getOperand(0).isDead();
303 NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
305 RegState::Define | getDeadRegState(isDead))
306 .addFrameIndex(FI).addImm(0));