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 bool Thumb1InstrInfo::isMoveInstr(const MachineInstr &MI,
30 unsigned &SrcReg, unsigned &DstReg,
31 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
32 SrcSubIdx = DstSubIdx = 0; // No sub-registers.
34 unsigned oc = MI.getOpcode();
39 case ARM::tMOVhir2lor:
40 case ARM::tMOVlor2hir:
41 case ARM::tMOVhir2hir:
42 assert(MI.getDesc().getNumOperands() >= 2 &&
43 MI.getOperand(0).isReg() &&
44 MI.getOperand(1).isReg() &&
45 "Invalid Thumb MOV instruction");
46 SrcReg = MI.getOperand(1).getReg();
47 DstReg = MI.getOperand(0).getReg();
52 unsigned Thumb1InstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
53 int &FrameIndex) const {
54 switch (MI->getOpcode()) {
57 if (MI->getOperand(1).isFI() &&
58 MI->getOperand(2).isImm() &&
59 MI->getOperand(2).getImm() == 0) {
60 FrameIndex = MI->getOperand(1).getIndex();
61 return MI->getOperand(0).getReg();
68 unsigned Thumb1InstrInfo::isStoreToStackSlot(const MachineInstr *MI,
69 int &FrameIndex) const {
70 switch (MI->getOpcode()) {
73 if (MI->getOperand(1).isFI() &&
74 MI->getOperand(2).isImm() &&
75 MI->getOperand(2).getImm() == 0) {
76 FrameIndex = MI->getOperand(1).getIndex();
77 return MI->getOperand(0).getReg();
84 bool Thumb1InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
85 MachineBasicBlock::iterator I,
86 unsigned DestReg, unsigned SrcReg,
87 const TargetRegisterClass *DestRC,
88 const TargetRegisterClass *SrcRC) const {
89 DebugLoc DL = DebugLoc::getUnknownLoc();
90 if (I != MBB.end()) DL = I->getDebugLoc();
92 if (DestRC == ARM::GPRRegisterClass) {
93 if (SrcRC == ARM::GPRRegisterClass) {
94 BuildMI(MBB, I, DL, get(ARM::tMOVhir2hir), DestReg).addReg(SrcReg);
96 } else if (SrcRC == ARM::tGPRRegisterClass) {
97 BuildMI(MBB, I, DL, get(ARM::tMOVlor2hir), DestReg).addReg(SrcReg);
100 } else if (DestRC == ARM::tGPRRegisterClass) {
101 if (SrcRC == ARM::GPRRegisterClass) {
102 BuildMI(MBB, I, DL, get(ARM::tMOVhir2lor), DestReg).addReg(SrcReg);
104 } else if (SrcRC == ARM::tGPRRegisterClass) {
105 BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg).addReg(SrcReg);
113 bool Thumb1InstrInfo::
114 canFoldMemoryOperand(const MachineInstr *MI,
115 const SmallVectorImpl<unsigned> &Ops) const {
116 if (Ops.size() != 1) return false;
118 unsigned OpNum = Ops[0];
119 unsigned Opc = MI->getOpcode();
123 case ARM::tMOVlor2hir:
124 case ARM::tMOVhir2lor:
125 case ARM::tMOVhir2hir: {
126 if (OpNum == 0) { // move -> store
127 unsigned SrcReg = MI->getOperand(1).getReg();
128 if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
129 // tSpill cannot take a high register operand.
131 } else { // move -> load
132 unsigned DstReg = MI->getOperand(0).getReg();
133 if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
134 // tRestore cannot target a high register operand.
144 void Thumb1InstrInfo::
145 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
146 unsigned SrcReg, bool isKill, int FI,
147 const TargetRegisterClass *RC) const {
148 DebugLoc DL = DebugLoc::getUnknownLoc();
149 if (I != MBB.end()) DL = I->getDebugLoc();
151 assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
153 if (RC == ARM::tGPRRegisterClass) {
154 BuildMI(MBB, I, DL, get(ARM::tSpill))
155 .addReg(SrcReg, getKillRegState(isKill))
156 .addFrameIndex(FI).addImm(0);
160 void Thumb1InstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
162 SmallVectorImpl<MachineOperand> &Addr,
163 const TargetRegisterClass *RC,
164 SmallVectorImpl<MachineInstr*> &NewMIs) const{
165 DebugLoc DL = DebugLoc::getUnknownLoc();
168 assert(RC == ARM::GPRRegisterClass && "Unknown regclass!");
169 if (RC == ARM::GPRRegisterClass) {
170 Opc = Addr[0].isFI() ? ARM::tSpill : ARM::tSTR;
173 MachineInstrBuilder MIB =
174 BuildMI(MF, DL, get(Opc)).addReg(SrcReg, getKillRegState(isKill));
175 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
176 MIB.addOperand(Addr[i]);
177 NewMIs.push_back(MIB);
181 void Thumb1InstrInfo::
182 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
183 unsigned DestReg, int FI,
184 const TargetRegisterClass *RC) const {
185 DebugLoc DL = DebugLoc::getUnknownLoc();
186 if (I != MBB.end()) DL = I->getDebugLoc();
188 assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
190 if (RC == ARM::tGPRRegisterClass) {
191 BuildMI(MBB, I, DL, get(ARM::tRestore), DestReg)
192 .addFrameIndex(FI).addImm(0);
196 void Thumb1InstrInfo::
197 loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
198 SmallVectorImpl<MachineOperand> &Addr,
199 const TargetRegisterClass *RC,
200 SmallVectorImpl<MachineInstr*> &NewMIs) const {
201 DebugLoc DL = DebugLoc::getUnknownLoc();
204 if (RC == ARM::GPRRegisterClass) {
205 Opc = Addr[0].isFI() ? ARM::tRestore : ARM::tLDR;
208 MachineInstrBuilder MIB = BuildMI(MF, DL, get(Opc), DestReg);
209 for (unsigned i = 0, e = Addr.size(); i != e; ++i)
210 MIB.addOperand(Addr[i]);
211 NewMIs.push_back(MIB);
215 bool Thumb1InstrInfo::
216 spillCalleeSavedRegisters(MachineBasicBlock &MBB,
217 MachineBasicBlock::iterator MI,
218 const std::vector<CalleeSavedInfo> &CSI) const {
222 DebugLoc DL = DebugLoc::getUnknownLoc();
223 if (MI != MBB.end()) DL = MI->getDebugLoc();
225 MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, get(ARM::tPUSH));
226 for (unsigned i = CSI.size(); i != 0; --i) {
227 unsigned Reg = CSI[i-1].getReg();
228 // Add the callee-saved register as live-in. It's killed at the spill.
230 MIB.addReg(Reg, RegState::Kill);
235 bool Thumb1InstrInfo::
236 restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
237 MachineBasicBlock::iterator MI,
238 const std::vector<CalleeSavedInfo> &CSI) const {
239 MachineFunction &MF = *MBB.getParent();
240 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
244 bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
245 MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
246 for (unsigned i = CSI.size(); i != 0; --i) {
247 unsigned Reg = CSI[i-1].getReg();
248 if (Reg == ARM::LR) {
249 // Special epilogue for vararg functions. See emitEpilogue
253 PopMI->setDesc(get(ARM::tPOP_RET));
256 PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
259 // It's illegal to emit pop instruction without operands.
260 if (PopMI->getNumOperands() > 0)
261 MBB.insert(MI, PopMI);
266 MachineInstr *Thumb1InstrInfo::
267 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
268 const SmallVectorImpl<unsigned> &Ops, int FI) const {
269 if (Ops.size() != 1) return NULL;
271 unsigned OpNum = Ops[0];
272 unsigned Opc = MI->getOpcode();
273 MachineInstr *NewMI = NULL;
277 case ARM::tMOVlor2hir:
278 case ARM::tMOVhir2lor:
279 case ARM::tMOVhir2hir: {
280 if (OpNum == 0) { // move -> store
281 unsigned SrcReg = MI->getOperand(1).getReg();
282 bool isKill = MI->getOperand(1).isKill();
283 if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
284 // tSpill cannot take a high register operand.
286 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
287 .addReg(SrcReg, getKillRegState(isKill))
288 .addFrameIndex(FI).addImm(0);
289 } else { // move -> load
290 unsigned DstReg = MI->getOperand(0).getReg();
291 if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
292 // tRestore cannot target a high register operand.
294 bool isDead = MI->getOperand(0).isDead();
295 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
296 .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
297 .addFrameIndex(FI).addImm(0);