1//===-- MipsSEInstrInfo.cpp - Mips32/64 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 Mips32/64 implementation of the TargetInstrInfo class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "MipsSEInstrInfo.h" 15#include "MipsTargetMachine.h" 16#include "MipsMachineFunction.h" 17#include "InstPrinter/MipsInstPrinter.h" 18#include "llvm/CodeGen/MachineInstrBuilder.h" 19#include "llvm/CodeGen/MachineRegisterInfo.h" 20#include "llvm/Support/ErrorHandling.h" 21#include "llvm/Support/TargetRegistry.h" 22#include "llvm/ADT/STLExtras.h" 23 24using namespace llvm; 25 26MipsSEInstrInfo::MipsSEInstrInfo(MipsTargetMachine &tm) 27 : MipsInstrInfo(tm, 28 tm.getRelocationModel() == Reloc::PIC_ ? Mips::B : Mips::J), 29 RI(*tm.getSubtargetImpl(), *this), 30 IsN64(tm.getSubtarget<MipsSubtarget>().isABI_N64()) {} 31 32const MipsRegisterInfo &MipsSEInstrInfo::getRegisterInfo() const { 33 return RI; 34} 35 36/// isLoadFromStackSlot - If the specified machine instruction is a direct 37/// load from a stack slot, return the virtual or physical register number of 38/// the destination along with the FrameIndex of the loaded stack slot. If 39/// not, return 0. This predicate must return 0 if the instruction has 40/// any side effects other than loading from the stack slot. 41unsigned MipsSEInstrInfo:: 42isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const 43{ 44 unsigned Opc = MI->getOpcode(); 45 46 if ((Opc == Mips::LW) || (Opc == Mips::LW_P8) || (Opc == Mips::LD) || 47 (Opc == Mips::LD_P8) || (Opc == Mips::LWC1) || (Opc == Mips::LWC1_P8) || 48 (Opc == Mips::LDC1) || (Opc == Mips::LDC164) || 49 (Opc == Mips::LDC164_P8)) { 50 if ((MI->getOperand(1).isFI()) && // is a stack slot 51 (MI->getOperand(2).isImm()) && // the imm is zero 52 (isZeroImm(MI->getOperand(2)))) { 53 FrameIndex = MI->getOperand(1).getIndex(); 54 return MI->getOperand(0).getReg(); 55 } 56 } 57 58 return 0; 59} 60 61/// isStoreToStackSlot - If the specified machine instruction is a direct 62/// store to a stack slot, return the virtual or physical register number of 63/// the source reg along with the FrameIndex of the loaded stack slot. If 64/// not, return 0. This predicate must return 0 if the instruction has 65/// any side effects other than storing to the stack slot. 66unsigned MipsSEInstrInfo:: 67isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const 68{ 69 unsigned Opc = MI->getOpcode(); 70 71 if ((Opc == Mips::SW) || (Opc == Mips::SW_P8) || (Opc == Mips::SD) || 72 (Opc == Mips::SD_P8) || (Opc == Mips::SWC1) || (Opc == Mips::SWC1_P8) || 73 (Opc == Mips::SDC1) || (Opc == Mips::SDC164) || 74 (Opc == Mips::SDC164_P8)) { 75 if ((MI->getOperand(1).isFI()) && // is a stack slot 76 (MI->getOperand(2).isImm()) && // the imm is zero 77 (isZeroImm(MI->getOperand(2)))) { 78 FrameIndex = MI->getOperand(1).getIndex(); 79 return MI->getOperand(0).getReg(); 80 } 81 } 82 return 0; 83} 84 85void MipsSEInstrInfo::copyPhysReg(MachineBasicBlock &MBB, 86 MachineBasicBlock::iterator I, DebugLoc DL, 87 unsigned DestReg, unsigned SrcReg, 88 bool KillSrc) const { 89 unsigned Opc = 0, ZeroReg = 0; 90 91 if (Mips::CPURegsRegClass.contains(DestReg)) { // Copy to CPU Reg. 92 if (Mips::CPURegsRegClass.contains(SrcReg)) 93 Opc = Mips::ADDu, ZeroReg = Mips::ZERO; 94 else if (Mips::CCRRegClass.contains(SrcReg)) 95 Opc = Mips::CFC1; 96 else if (Mips::FGR32RegClass.contains(SrcReg)) 97 Opc = Mips::MFC1; 98 else if (SrcReg == Mips::HI) 99 Opc = Mips::MFHI, SrcReg = 0; 100 else if (SrcReg == Mips::LO) 101 Opc = Mips::MFLO, SrcReg = 0; 102 } 103 else if (Mips::CPURegsRegClass.contains(SrcReg)) { // Copy from CPU Reg. 104 if (Mips::CCRRegClass.contains(DestReg)) 105 Opc = Mips::CTC1; 106 else if (Mips::FGR32RegClass.contains(DestReg)) 107 Opc = Mips::MTC1; 108 else if (DestReg == Mips::HI) 109 Opc = Mips::MTHI, DestReg = 0; 110 else if (DestReg == Mips::LO) 111 Opc = Mips::MTLO, DestReg = 0; 112 } 113 else if (Mips::FGR32RegClass.contains(DestReg, SrcReg)) 114 Opc = Mips::FMOV_S; 115 else if (Mips::AFGR64RegClass.contains(DestReg, SrcReg)) 116 Opc = Mips::FMOV_D32; 117 else if (Mips::FGR64RegClass.contains(DestReg, SrcReg)) 118 Opc = Mips::FMOV_D64; 119 else if (Mips::CCRRegClass.contains(DestReg, SrcReg)) 120 Opc = Mips::MOVCCRToCCR; 121 else if (Mips::CPU64RegsRegClass.contains(DestReg)) { // Copy to CPU64 Reg. 122 if (Mips::CPU64RegsRegClass.contains(SrcReg)) 123 Opc = Mips::DADDu, ZeroReg = Mips::ZERO_64; 124 else if (SrcReg == Mips::HI64) 125 Opc = Mips::MFHI64, SrcReg = 0; 126 else if (SrcReg == Mips::LO64) 127 Opc = Mips::MFLO64, SrcReg = 0; 128 else if (Mips::FGR64RegClass.contains(SrcReg)) 129 Opc = Mips::DMFC1; 130 } 131 else if (Mips::CPU64RegsRegClass.contains(SrcReg)) { // Copy from CPU64 Reg. 132 if (DestReg == Mips::HI64) 133 Opc = Mips::MTHI64, DestReg = 0; 134 else if (DestReg == Mips::LO64) 135 Opc = Mips::MTLO64, DestReg = 0; 136 else if (Mips::FGR64RegClass.contains(DestReg)) 137 Opc = Mips::DMTC1; 138 } 139 140 assert(Opc && "Cannot copy registers"); 141 142 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(Opc)); 143 144 if (DestReg) 145 MIB.addReg(DestReg, RegState::Define); 146 147 if (ZeroReg) 148 MIB.addReg(ZeroReg); 149 150 if (SrcReg) 151 MIB.addReg(SrcReg, getKillRegState(KillSrc)); 152} 153 154void MipsSEInstrInfo:: 155storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 156 unsigned SrcReg, bool isKill, int FI, 157 const TargetRegisterClass *RC, 158 const TargetRegisterInfo *TRI) const { 159 DebugLoc DL; 160 if (I != MBB.end()) DL = I->getDebugLoc(); 161 MachineMemOperand *MMO = GetMemOperand(MBB, FI, MachineMemOperand::MOStore); 162 163 unsigned Opc = 0; 164 165 if (Mips::CPURegsRegClass.hasSubClassEq(RC)) 166 Opc = IsN64 ? Mips::SW_P8 : Mips::SW; 167 else if (Mips::CPU64RegsRegClass.hasSubClassEq(RC)) 168 Opc = IsN64 ? Mips::SD_P8 : Mips::SD; 169 else if (Mips::FGR32RegClass.hasSubClassEq(RC)) 170 Opc = IsN64 ? Mips::SWC1_P8 : Mips::SWC1; 171 else if (Mips::AFGR64RegClass.hasSubClassEq(RC)) 172 Opc = Mips::SDC1; 173 else if (Mips::FGR64RegClass.hasSubClassEq(RC)) 174 Opc = IsN64 ? Mips::SDC164_P8 : Mips::SDC164; 175 176 assert(Opc && "Register class not handled!"); 177 BuildMI(MBB, I, DL, get(Opc)).addReg(SrcReg, getKillRegState(isKill)) 178 .addFrameIndex(FI).addImm(0).addMemOperand(MMO); 179} 180 181void MipsSEInstrInfo:: 182loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 183 unsigned DestReg, int FI, 184 const TargetRegisterClass *RC, 185 const TargetRegisterInfo *TRI) const 186{ 187 DebugLoc DL; 188 if (I != MBB.end()) DL = I->getDebugLoc(); 189 MachineMemOperand *MMO = GetMemOperand(MBB, FI, MachineMemOperand::MOLoad); 190 unsigned Opc = 0; 191 192 if (Mips::CPURegsRegClass.hasSubClassEq(RC)) 193 Opc = IsN64 ? Mips::LW_P8 : Mips::LW; 194 else if (Mips::CPU64RegsRegClass.hasSubClassEq(RC)) 195 Opc = IsN64 ? Mips::LD_P8 : Mips::LD; 196 else if (Mips::FGR32RegClass.hasSubClassEq(RC)) 197 Opc = IsN64 ? Mips::LWC1_P8 : Mips::LWC1; 198 else if (Mips::AFGR64RegClass.hasSubClassEq(RC)) 199 Opc = Mips::LDC1; 200 else if (Mips::FGR64RegClass.hasSubClassEq(RC)) 201 Opc = IsN64 ? Mips::LDC164_P8 : Mips::LDC164; 202 203 assert(Opc && "Register class not handled!"); 204 BuildMI(MBB, I, DL, get(Opc), DestReg).addFrameIndex(FI).addImm(0) 205 .addMemOperand(MMO); 206} 207 208bool MipsSEInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const { 209 MachineBasicBlock &MBB = *MI->getParent(); 210 211 switch(MI->getDesc().getOpcode()) { 212 default: 213 return false; 214 case Mips::RetRA: 215 ExpandRetRA(MBB, MI, Mips::RET); 216 break; 217 case Mips::BuildPairF64: 218 ExpandBuildPairF64(MBB, MI); 219 break; 220 case Mips::ExtractElementF64: 221 ExpandExtractElementF64(MBB, MI); 222 break; 223 } 224 225 MBB.erase(MI); 226 return true; 227} 228 229/// GetOppositeBranchOpc - Return the inverse of the specified 230/// opcode, e.g. turning BEQ to BNE. 231unsigned MipsSEInstrInfo::GetOppositeBranchOpc(unsigned Opc) const { 232 switch (Opc) { 233 default: llvm_unreachable("Illegal opcode!"); 234 case Mips::BEQ: return Mips::BNE; 235 case Mips::BNE: return Mips::BEQ; 236 case Mips::BGTZ: return Mips::BLEZ; 237 case Mips::BGEZ: return Mips::BLTZ; 238 case Mips::BLTZ: return Mips::BGEZ; 239 case Mips::BLEZ: return Mips::BGTZ; 240 case Mips::BEQ64: return Mips::BNE64; 241 case Mips::BNE64: return Mips::BEQ64; 242 case Mips::BGTZ64: return Mips::BLEZ64; 243 case Mips::BGEZ64: return Mips::BLTZ64; 244 case Mips::BLTZ64: return Mips::BGEZ64; 245 case Mips::BLEZ64: return Mips::BGTZ64; 246 case Mips::BC1T: return Mips::BC1F; 247 case Mips::BC1F: return Mips::BC1T; 248 } 249} 250 251/// Adjust SP by Amount bytes. 252void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount, 253 MachineBasicBlock &MBB, 254 MachineBasicBlock::iterator I) const { 255 const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>(); 256 DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc(); 257 unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu; 258 unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu; 259 260 if (isInt<16>(Amount))// addi sp, sp, amount 261 BuildMI(MBB, I, DL, get(ADDiu), SP).addReg(SP).addImm(Amount); 262 else { // Expand immediate that doesn't fit in 16-bit. 263 MBB.getParent()->getInfo<MipsFunctionInfo>()->setEmitNOAT(); 264 unsigned Reg = loadImmediate(Amount, MBB, I, DL, 0); 265 BuildMI(MBB, I, DL, get(ADDu), SP).addReg(SP).addReg(Reg); 266 } 267} 268 269/// This function generates the sequence of instructions needed to get the 270/// result of adding register REG and immediate IMM. 271unsigned 272MipsSEInstrInfo::loadImmediate(int64_t Imm, MachineBasicBlock &MBB, 273 MachineBasicBlock::iterator II, DebugLoc DL, 274 unsigned *NewImm) const { 275 MipsAnalyzeImmediate AnalyzeImm; 276 const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>(); 277 unsigned Size = STI.isABI_N64() ? 64 : 32; 278 unsigned LUi = STI.isABI_N64() ? Mips::LUi64 : Mips::LUi; 279 unsigned ZEROReg = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO; 280 unsigned ATReg = STI.isABI_N64() ? Mips::AT_64 : Mips::AT; 281 bool LastInstrIsADDiu = NewImm; 282 283 const MipsAnalyzeImmediate::InstSeq &Seq = 284 AnalyzeImm.Analyze(Imm, Size, LastInstrIsADDiu); 285 MipsAnalyzeImmediate::InstSeq::const_iterator Inst = Seq.begin(); 286 287 assert(Seq.size() && (!LastInstrIsADDiu || (Seq.size() > 1))); 288 289 // The first instruction can be a LUi, which is different from other 290 // instructions (ADDiu, ORI and SLL) in that it does not have a register 291 // operand. 292 if (Inst->Opc == LUi) 293 BuildMI(MBB, II, DL, get(LUi), ATReg) 294 .addImm(SignExtend64<16>(Inst->ImmOpnd)); 295 else 296 BuildMI(MBB, II, DL, get(Inst->Opc), ATReg).addReg(ZEROReg) 297 .addImm(SignExtend64<16>(Inst->ImmOpnd)); 298 299 // Build the remaining instructions in Seq. 300 for (++Inst; Inst != Seq.end() - LastInstrIsADDiu; ++Inst) 301 BuildMI(MBB, II, DL, get(Inst->Opc), ATReg).addReg(ATReg) 302 .addImm(SignExtend64<16>(Inst->ImmOpnd)); 303 304 if (LastInstrIsADDiu) 305 *NewImm = Inst->ImmOpnd; 306 307 return ATReg; 308} 309 310unsigned MipsSEInstrInfo::GetAnalyzableBrOpc(unsigned Opc) const { 311 return (Opc == Mips::BEQ || Opc == Mips::BNE || Opc == Mips::BGTZ || 312 Opc == Mips::BGEZ || Opc == Mips::BLTZ || Opc == Mips::BLEZ || 313 Opc == Mips::BEQ64 || Opc == Mips::BNE64 || Opc == Mips::BGTZ64 || 314 Opc == Mips::BGEZ64 || Opc == Mips::BLTZ64 || Opc == Mips::BLEZ64 || 315 Opc == Mips::BC1T || Opc == Mips::BC1F || Opc == Mips::B || 316 Opc == Mips::J) ? 317 Opc : 0; 318} 319 320void MipsSEInstrInfo::ExpandRetRA(MachineBasicBlock &MBB, 321 MachineBasicBlock::iterator I, 322 unsigned Opc) const { 323 BuildMI(MBB, I, I->getDebugLoc(), get(Opc)).addReg(Mips::RA); 324} 325 326void MipsSEInstrInfo::ExpandExtractElementF64(MachineBasicBlock &MBB, 327 MachineBasicBlock::iterator I) const { 328 unsigned DstReg = I->getOperand(0).getReg(); 329 unsigned SrcReg = I->getOperand(1).getReg(); 330 unsigned N = I->getOperand(2).getImm(); 331 const MCInstrDesc& Mfc1Tdd = get(Mips::MFC1); 332 DebugLoc dl = I->getDebugLoc(); 333 334 assert(N < 2 && "Invalid immediate"); 335 unsigned SubIdx = N ? Mips::sub_fpodd : Mips::sub_fpeven; 336 unsigned SubReg = getRegisterInfo().getSubReg(SrcReg, SubIdx); 337 338 BuildMI(MBB, I, dl, Mfc1Tdd, DstReg).addReg(SubReg); 339} 340 341void MipsSEInstrInfo::ExpandBuildPairF64(MachineBasicBlock &MBB, 342 MachineBasicBlock::iterator I) const { 343 unsigned DstReg = I->getOperand(0).getReg(); 344 unsigned LoReg = I->getOperand(1).getReg(), HiReg = I->getOperand(2).getReg(); 345 const MCInstrDesc& Mtc1Tdd = get(Mips::MTC1); 346 DebugLoc dl = I->getDebugLoc(); 347 const TargetRegisterInfo &TRI = getRegisterInfo(); 348 349 // mtc1 Lo, $fp 350 // mtc1 Hi, $fp + 1 351 BuildMI(MBB, I, dl, Mtc1Tdd, TRI.getSubReg(DstReg, Mips::sub_fpeven)) 352 .addReg(LoReg); 353 BuildMI(MBB, I, dl, Mtc1Tdd, TRI.getSubReg(DstReg, Mips::sub_fpodd)) 354 .addReg(HiReg); 355} 356 357const MipsInstrInfo *llvm::createMipsSEInstrInfo(MipsTargetMachine &TM) { 358 return new MipsSEInstrInfo(TM); 359} 360