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::BX_RET: return ARM::tBX_RET;
41 case ARMII::LDRri: return 0;
42 case ARMII::MOVr: return ARM::tMOVr;
43 case ARMII::STRri: return 0;
44 case ARMII::SUBri: return ARM::tSUBi8;
45 case ARMII::SUBrs: return 0;
46 case ARMII::SUBrr: return ARM::tSUBrr;
55 Thumb1InstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
56 if (MBB.empty()) return false;
58 switch (MBB.back().getOpcode()) {
60 case ARM::tBX_RET_vararg:
72 bool Thumb1InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
73 MachineBasicBlock::iterator I,
74 unsigned DestReg, unsigned SrcReg,
75 const TargetRegisterClass *DestRC,
76 const TargetRegisterClass *SrcRC) const {
77 DebugLoc DL = DebugLoc::getUnknownLoc();
78 if (I != MBB.end()) DL = I->getDebugLoc();
80 if (DestRC == ARM::GPRRegisterClass) {
81 if (SrcRC == ARM::GPRRegisterClass) {
82 BuildMI(MBB, I, DL, get(ARM::tMOVgpr2gpr), DestReg).addReg(SrcReg);
84 } else if (SrcRC == ARM::tGPRRegisterClass) {
85 BuildMI(MBB, I, DL, get(ARM::tMOVtgpr2gpr), DestReg).addReg(SrcReg);
88 } else if (DestRC == ARM::tGPRRegisterClass) {
89 if (SrcRC == ARM::GPRRegisterClass) {
90 BuildMI(MBB, I, DL, get(ARM::tMOVgpr2tgpr), DestReg).addReg(SrcReg);
92 } else if (SrcRC == ARM::tGPRRegisterClass) {
93 BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg).addReg(SrcReg);
101 bool Thumb1InstrInfo::
102 canFoldMemoryOperand(const MachineInstr *MI,
103 const SmallVectorImpl<unsigned> &Ops) const {
104 if (Ops.size() != 1) return false;
106 unsigned OpNum = Ops[0];
107 unsigned Opc = MI->getOpcode();
111 case ARM::tMOVtgpr2gpr:
112 case ARM::tMOVgpr2tgpr:
113 case ARM::tMOVgpr2gpr: {
114 if (OpNum == 0) { // move -> store
115 unsigned SrcReg = MI->getOperand(1).getReg();
116 if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
117 // tSpill cannot take a high register operand.
119 } else { // move -> load
120 unsigned DstReg = MI->getOperand(0).getReg();
121 if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
122 // tRestore cannot target a high register operand.
132 void Thumb1InstrInfo::
133 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
134 unsigned SrcReg, bool isKill, int FI,
135 const TargetRegisterClass *RC) const {
136 DebugLoc DL = DebugLoc::getUnknownLoc();
137 if (I != MBB.end()) DL = I->getDebugLoc();
139 assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
141 if (RC == ARM::tGPRRegisterClass) {
142 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSpill))
143 .addReg(SrcReg, getKillRegState(isKill))
144 .addFrameIndex(FI).addImm(0));
148 void Thumb1InstrInfo::
149 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
150 unsigned DestReg, int FI,
151 const TargetRegisterClass *RC) const {
152 DebugLoc DL = DebugLoc::getUnknownLoc();
153 if (I != MBB.end()) DL = I->getDebugLoc();
155 assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
157 if (RC == ARM::tGPRRegisterClass) {
158 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tRestore), DestReg)
159 .addFrameIndex(FI).addImm(0));
163 bool Thumb1InstrInfo::
164 spillCalleeSavedRegisters(MachineBasicBlock &MBB,
165 MachineBasicBlock::iterator MI,
166 const std::vector<CalleeSavedInfo> &CSI) const {
170 DebugLoc DL = DebugLoc::getUnknownLoc();
171 if (MI != MBB.end()) DL = MI->getDebugLoc();
173 MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, get(ARM::tPUSH));
174 for (unsigned i = CSI.size(); i != 0; --i) {
175 unsigned Reg = CSI[i-1].getReg();
176 // Add the callee-saved register as live-in. It's killed at the spill.
178 MIB.addReg(Reg, RegState::Kill);
183 bool Thumb1InstrInfo::
184 restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
185 MachineBasicBlock::iterator MI,
186 const std::vector<CalleeSavedInfo> &CSI) const {
187 MachineFunction &MF = *MBB.getParent();
188 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
192 bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
193 MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
194 for (unsigned i = CSI.size(); i != 0; --i) {
195 unsigned Reg = CSI[i-1].getReg();
196 if (Reg == ARM::LR) {
197 // Special epilogue for vararg functions. See emitEpilogue
201 PopMI->setDesc(get(ARM::tPOP_RET));
204 PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
207 // It's illegal to emit pop instruction without operands.
208 if (PopMI->getNumOperands() > 0)
209 MBB.insert(MI, PopMI);
214 MachineInstr *Thumb1InstrInfo::
215 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
216 const SmallVectorImpl<unsigned> &Ops, int FI) const {
217 if (Ops.size() != 1) return NULL;
219 unsigned OpNum = Ops[0];
220 unsigned Opc = MI->getOpcode();
221 MachineInstr *NewMI = NULL;
225 case ARM::tMOVtgpr2gpr:
226 case ARM::tMOVgpr2tgpr:
227 case ARM::tMOVgpr2gpr: {
228 if (OpNum == 0) { // move -> store
229 unsigned SrcReg = MI->getOperand(1).getReg();
230 bool isKill = MI->getOperand(1).isKill();
231 if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
232 // tSpill cannot take a high register operand.
234 NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
235 .addReg(SrcReg, getKillRegState(isKill))
236 .addFrameIndex(FI).addImm(0));
237 } else { // move -> load
238 unsigned DstReg = MI->getOperand(0).getReg();
239 if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
240 // tRestore cannot target a high register operand.
242 bool isDead = MI->getOperand(0).isDead();
243 NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
245 RegState::Define | getDeadRegState(isDead))
246 .addFrameIndex(FI).addImm(0));