1 //===-- PPCRegisterInfo.cpp - PowerPC Register 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 PowerPC implementation of the TargetRegisterInfo 11 // class. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "PPCRegisterInfo.h" 16 #include "PPC.h" 17 #include "PPCFrameLowering.h" 18 #include "PPCInstrBuilder.h" 19 #include "PPCMachineFunctionInfo.h" 20 #include "PPCSubtarget.h" 21 #include "PPCTargetMachine.h" 22 #include "llvm/ADT/BitVector.h" 23 #include "llvm/ADT/STLExtras.h" 24 #include "llvm/CodeGen/MachineFrameInfo.h" 25 #include "llvm/CodeGen/MachineFunction.h" 26 #include "llvm/CodeGen/MachineInstrBuilder.h" 27 #include "llvm/CodeGen/MachineModuleInfo.h" 28 #include "llvm/CodeGen/MachineRegisterInfo.h" 29 #include "llvm/CodeGen/RegisterScavenging.h" 30 #include "llvm/IR/CallingConv.h" 31 #include "llvm/IR/Constants.h" 32 #include "llvm/IR/Function.h" 33 #include "llvm/IR/Type.h" 34 #include "llvm/Support/CommandLine.h" 35 #include "llvm/Support/Debug.h" 36 #include "llvm/Support/ErrorHandling.h" 37 #include "llvm/Support/MathExtras.h" 38 #include "llvm/Support/raw_ostream.h" 39 #include "llvm/Target/TargetFrameLowering.h" 40 #include "llvm/Target/TargetInstrInfo.h" 41 #include "llvm/Target/TargetMachine.h" 42 #include "llvm/Target/TargetOptions.h" 43 #include <cstdlib> 44 45 using namespace llvm; 46 47 #define DEBUG_TYPE "reginfo" 48 49 #define GET_REGINFO_TARGET_DESC 50 #include "PPCGenRegisterInfo.inc" 51 52 static cl::opt<bool> 53 EnableBasePointer("ppc-use-base-pointer", cl::Hidden, cl::init(true), 54 cl::desc("Enable use of a base pointer for complex stack frames")); 55 56 static cl::opt<bool> 57 AlwaysBasePointer("ppc-always-use-base-pointer", cl::Hidden, cl::init(false), 58 cl::desc("Force the use of a base pointer in every function")); 59 60 PPCRegisterInfo::PPCRegisterInfo(const PPCTargetMachine &TM) 61 : PPCGenRegisterInfo(TM.isPPC64() ? PPC::LR8 : PPC::LR, 62 TM.isPPC64() ? 0 : 1, 63 TM.isPPC64() ? 0 : 1), 64 TM(TM) { 65 ImmToIdxMap[PPC::LD] = PPC::LDX; ImmToIdxMap[PPC::STD] = PPC::STDX; 66 ImmToIdxMap[PPC::LBZ] = PPC::LBZX; ImmToIdxMap[PPC::STB] = PPC::STBX; 67 ImmToIdxMap[PPC::LHZ] = PPC::LHZX; ImmToIdxMap[PPC::LHA] = PPC::LHAX; 68 ImmToIdxMap[PPC::LWZ] = PPC::LWZX; ImmToIdxMap[PPC::LWA] = PPC::LWAX; 69 ImmToIdxMap[PPC::LFS] = PPC::LFSX; ImmToIdxMap[PPC::LFD] = PPC::LFDX; 70 ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX; 71 ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX; 72 ImmToIdxMap[PPC::ADDI] = PPC::ADD4; 73 ImmToIdxMap[PPC::LWA_32] = PPC::LWAX_32; 74 75 // 64-bit 76 ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8; 77 ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8; 78 ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8; 79 ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX; 80 ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; 81 } 82 83 /// getPointerRegClass - Return the register class to use to hold pointers. 84 /// This is used for addressing modes. 85 const TargetRegisterClass * 86 PPCRegisterInfo::getPointerRegClass(const MachineFunction &MF, unsigned Kind) 87 const { 88 // Note that PPCInstrInfo::FoldImmediate also directly uses this Kind value 89 // when it checks for ZERO folding. 90 if (Kind == 1) { 91 if (TM.isPPC64()) 92 return &PPC::G8RC_NOX0RegClass; 93 return &PPC::GPRC_NOR0RegClass; 94 } 95 96 if (TM.isPPC64()) 97 return &PPC::G8RCRegClass; 98 return &PPC::GPRCRegClass; 99 } 100 101 const MCPhysReg* 102 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const { 103 const PPCSubtarget &Subtarget = MF->getSubtarget<PPCSubtarget>(); 104 if (MF->getFunction()->getCallingConv() == CallingConv::AnyReg) { 105 if (Subtarget.hasVSX()) 106 return CSR_64_AllRegs_VSX_SaveList; 107 if (Subtarget.hasAltivec()) 108 return CSR_64_AllRegs_Altivec_SaveList; 109 return CSR_64_AllRegs_SaveList; 110 } 111 112 if (Subtarget.isDarwinABI()) 113 return TM.isPPC64() 114 ? (Subtarget.hasAltivec() ? CSR_Darwin64_Altivec_SaveList 115 : CSR_Darwin64_SaveList) 116 : (Subtarget.hasAltivec() ? CSR_Darwin32_Altivec_SaveList 117 : CSR_Darwin32_SaveList); 118 119 // On PPC64, we might need to save r2 (but only if it is not reserved). 120 bool SaveR2 = MF->getRegInfo().isAllocatable(PPC::X2); 121 122 return TM.isPPC64() 123 ? (Subtarget.hasAltivec() 124 ? (SaveR2 ? CSR_SVR464_R2_Altivec_SaveList 125 : CSR_SVR464_Altivec_SaveList) 126 : (SaveR2 ? CSR_SVR464_R2_SaveList : CSR_SVR464_SaveList)) 127 : (Subtarget.hasAltivec() ? CSR_SVR432_Altivec_SaveList 128 : CSR_SVR432_SaveList); 129 } 130 131 const uint32_t * 132 PPCRegisterInfo::getCallPreservedMask(const MachineFunction &MF, 133 CallingConv::ID CC) const { 134 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 135 if (CC == CallingConv::AnyReg) { 136 if (Subtarget.hasVSX()) 137 return CSR_64_AllRegs_VSX_RegMask; 138 if (Subtarget.hasAltivec()) 139 return CSR_64_AllRegs_Altivec_RegMask; 140 return CSR_64_AllRegs_RegMask; 141 } 142 143 if (Subtarget.isDarwinABI()) 144 return TM.isPPC64() ? (Subtarget.hasAltivec() ? CSR_Darwin64_Altivec_RegMask 145 : CSR_Darwin64_RegMask) 146 : (Subtarget.hasAltivec() ? CSR_Darwin32_Altivec_RegMask 147 : CSR_Darwin32_RegMask); 148 149 return TM.isPPC64() ? (Subtarget.hasAltivec() ? CSR_SVR464_Altivec_RegMask 150 : CSR_SVR464_RegMask) 151 : (Subtarget.hasAltivec() ? CSR_SVR432_Altivec_RegMask 152 : CSR_SVR432_RegMask); 153 } 154 155 const uint32_t* 156 PPCRegisterInfo::getNoPreservedMask() const { 157 return CSR_NoRegs_RegMask; 158 } 159 160 void PPCRegisterInfo::adjustStackMapLiveOutMask(uint32_t *Mask) const { 161 for (unsigned PseudoReg : {PPC::ZERO, PPC::ZERO8, PPC::RM}) 162 Mask[PseudoReg / 32] &= ~(1u << (PseudoReg % 32)); 163 } 164 165 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const { 166 BitVector Reserved(getNumRegs()); 167 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 168 const PPCFrameLowering *TFI = getFrameLowering(MF); 169 170 // The ZERO register is not really a register, but the representation of r0 171 // when used in instructions that treat r0 as the constant 0. 172 Reserved.set(PPC::ZERO); 173 Reserved.set(PPC::ZERO8); 174 175 // The FP register is also not really a register, but is the representation 176 // of the frame pointer register used by ISD::FRAMEADDR. 177 Reserved.set(PPC::FP); 178 Reserved.set(PPC::FP8); 179 180 // The BP register is also not really a register, but is the representation 181 // of the base pointer register used by setjmp. 182 Reserved.set(PPC::BP); 183 Reserved.set(PPC::BP8); 184 185 // The counter registers must be reserved so that counter-based loops can 186 // be correctly formed (and the mtctr instructions are not DCE'd). 187 Reserved.set(PPC::CTR); 188 Reserved.set(PPC::CTR8); 189 190 Reserved.set(PPC::R1); 191 Reserved.set(PPC::LR); 192 Reserved.set(PPC::LR8); 193 Reserved.set(PPC::RM); 194 195 if (!Subtarget.isDarwinABI() || !Subtarget.hasAltivec()) 196 Reserved.set(PPC::VRSAVE); 197 198 // The SVR4 ABI reserves r2 and r13 199 if (Subtarget.isSVR4ABI()) { 200 Reserved.set(PPC::R2); // System-reserved register 201 Reserved.set(PPC::R13); // Small Data Area pointer register 202 } 203 204 // On PPC64, r13 is the thread pointer. Never allocate this register. 205 if (TM.isPPC64()) { 206 Reserved.set(PPC::R13); 207 208 Reserved.set(PPC::X1); 209 Reserved.set(PPC::X13); 210 211 if (TFI->needsFP(MF)) 212 Reserved.set(PPC::X31); 213 214 if (hasBasePointer(MF)) 215 Reserved.set(PPC::X30); 216 217 // The 64-bit SVR4 ABI reserves r2 for the TOC pointer. 218 if (Subtarget.isSVR4ABI()) { 219 // We only reserve r2 if we need to use the TOC pointer. If we have no 220 // explicit uses of the TOC pointer (meaning we're a leaf function with 221 // no constant-pool loads, etc.) and we have no potential uses inside an 222 // inline asm block, then we can treat r2 has an ordinary callee-saved 223 // register. 224 const PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>(); 225 if (FuncInfo->usesTOCBasePtr() || MF.hasInlineAsm()) 226 Reserved.set(PPC::X2); 227 else 228 Reserved.reset(PPC::R2); 229 } 230 } 231 232 if (TFI->needsFP(MF)) 233 Reserved.set(PPC::R31); 234 235 if (hasBasePointer(MF)) { 236 if (Subtarget.isSVR4ABI() && !TM.isPPC64() && 237 TM.getRelocationModel() == Reloc::PIC_) 238 Reserved.set(PPC::R29); 239 else 240 Reserved.set(PPC::R30); 241 } 242 243 if (Subtarget.isSVR4ABI() && !TM.isPPC64() && 244 TM.getRelocationModel() == Reloc::PIC_) 245 Reserved.set(PPC::R30); 246 247 // Reserve Altivec registers when Altivec is unavailable. 248 if (!Subtarget.hasAltivec()) 249 for (TargetRegisterClass::iterator I = PPC::VRRCRegClass.begin(), 250 IE = PPC::VRRCRegClass.end(); I != IE; ++I) 251 Reserved.set(*I); 252 253 return Reserved; 254 } 255 256 unsigned PPCRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC, 257 MachineFunction &MF) const { 258 const PPCFrameLowering *TFI = getFrameLowering(MF); 259 const unsigned DefaultSafety = 1; 260 261 switch (RC->getID()) { 262 default: 263 return 0; 264 case PPC::G8RC_NOX0RegClassID: 265 case PPC::GPRC_NOR0RegClassID: 266 case PPC::G8RCRegClassID: 267 case PPC::GPRCRegClassID: { 268 unsigned FP = TFI->hasFP(MF) ? 1 : 0; 269 return 32 - FP - DefaultSafety; 270 } 271 case PPC::F8RCRegClassID: 272 case PPC::F4RCRegClassID: 273 case PPC::QFRCRegClassID: 274 case PPC::QSRCRegClassID: 275 case PPC::QBRCRegClassID: 276 case PPC::VRRCRegClassID: 277 case PPC::VFRCRegClassID: 278 case PPC::VSLRCRegClassID: 279 case PPC::VSHRCRegClassID: 280 return 32 - DefaultSafety; 281 case PPC::VSRCRegClassID: 282 case PPC::VSFRCRegClassID: 283 case PPC::VSSRCRegClassID: 284 return 64 - DefaultSafety; 285 case PPC::CRRCRegClassID: 286 return 8 - DefaultSafety; 287 } 288 } 289 290 const TargetRegisterClass * 291 PPCRegisterInfo::getLargestLegalSuperClass(const TargetRegisterClass *RC, 292 const MachineFunction &MF) const { 293 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 294 if (Subtarget.hasVSX()) { 295 // With VSX, we can inflate various sub-register classes to the full VSX 296 // register set. 297 298 if (RC == &PPC::F8RCRegClass) 299 return &PPC::VSFRCRegClass; 300 else if (RC == &PPC::VRRCRegClass) 301 return &PPC::VSRCRegClass; 302 else if (RC == &PPC::F4RCRegClass && Subtarget.hasP8Vector()) 303 return &PPC::VSSRCRegClass; 304 } 305 306 return TargetRegisterInfo::getLargestLegalSuperClass(RC, MF); 307 } 308 309 //===----------------------------------------------------------------------===// 310 // Stack Frame Processing methods 311 //===----------------------------------------------------------------------===// 312 313 /// lowerDynamicAlloc - Generate the code for allocating an object in the 314 /// current frame. The sequence of code will be in the general form 315 /// 316 /// addi R0, SP, \#frameSize ; get the address of the previous frame 317 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size 318 /// addi Rnew, SP, \#maxCalFrameSize ; get the top of the allocation 319 /// 320 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II) const { 321 // Get the instruction. 322 MachineInstr &MI = *II; 323 // Get the instruction's basic block. 324 MachineBasicBlock &MBB = *MI.getParent(); 325 // Get the basic block's function. 326 MachineFunction &MF = *MBB.getParent(); 327 // Get the frame info. 328 MachineFrameInfo *MFI = MF.getFrameInfo(); 329 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 330 // Get the instruction info. 331 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 332 // Determine whether 64-bit pointers are used. 333 bool LP64 = TM.isPPC64(); 334 DebugLoc dl = MI.getDebugLoc(); 335 336 // Get the maximum call stack size. 337 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize(); 338 // Get the total frame size. 339 unsigned FrameSize = MFI->getStackSize(); 340 341 // Get stack alignments. 342 const PPCFrameLowering *TFI = getFrameLowering(MF); 343 unsigned TargetAlign = TFI->getStackAlignment(); 344 unsigned MaxAlign = MFI->getMaxAlignment(); 345 assert((maxCallFrameSize & (MaxAlign-1)) == 0 && 346 "Maximum call-frame size not sufficiently aligned"); 347 348 // Determine the previous frame's address. If FrameSize can't be 349 // represented as 16 bits or we need special alignment, then we load the 350 // previous frame's address from 0(SP). Why not do an addis of the hi? 351 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero. 352 // Constructing the constant and adding would take 3 instructions. 353 // Fortunately, a frame greater than 32K is rare. 354 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass; 355 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 356 unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 357 358 if (MaxAlign < TargetAlign && isInt<16>(FrameSize)) { 359 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), Reg) 360 .addReg(PPC::R31) 361 .addImm(FrameSize); 362 } else if (LP64) { 363 BuildMI(MBB, II, dl, TII.get(PPC::LD), Reg) 364 .addImm(0) 365 .addReg(PPC::X1); 366 } else { 367 BuildMI(MBB, II, dl, TII.get(PPC::LWZ), Reg) 368 .addImm(0) 369 .addReg(PPC::R1); 370 } 371 372 bool KillNegSizeReg = MI.getOperand(1).isKill(); 373 unsigned NegSizeReg = MI.getOperand(1).getReg(); 374 375 // Grow the stack and update the stack pointer link, then determine the 376 // address of new allocated space. 377 if (LP64) { 378 if (MaxAlign > TargetAlign) { 379 unsigned UnalNegSizeReg = NegSizeReg; 380 NegSizeReg = MF.getRegInfo().createVirtualRegister(G8RC); 381 382 // Unfortunately, there is no andi, only andi., and we can't insert that 383 // here because we might clobber cr0 while it is live. 384 BuildMI(MBB, II, dl, TII.get(PPC::LI8), NegSizeReg) 385 .addImm(~(MaxAlign-1)); 386 387 unsigned NegSizeReg1 = NegSizeReg; 388 NegSizeReg = MF.getRegInfo().createVirtualRegister(G8RC); 389 BuildMI(MBB, II, dl, TII.get(PPC::AND8), NegSizeReg) 390 .addReg(UnalNegSizeReg, getKillRegState(KillNegSizeReg)) 391 .addReg(NegSizeReg1, RegState::Kill); 392 KillNegSizeReg = true; 393 } 394 395 BuildMI(MBB, II, dl, TII.get(PPC::STDUX), PPC::X1) 396 .addReg(Reg, RegState::Kill) 397 .addReg(PPC::X1) 398 .addReg(NegSizeReg, getKillRegState(KillNegSizeReg)); 399 BuildMI(MBB, II, dl, TII.get(PPC::ADDI8), MI.getOperand(0).getReg()) 400 .addReg(PPC::X1) 401 .addImm(maxCallFrameSize); 402 } else { 403 if (MaxAlign > TargetAlign) { 404 unsigned UnalNegSizeReg = NegSizeReg; 405 NegSizeReg = MF.getRegInfo().createVirtualRegister(GPRC); 406 407 // Unfortunately, there is no andi, only andi., and we can't insert that 408 // here because we might clobber cr0 while it is live. 409 BuildMI(MBB, II, dl, TII.get(PPC::LI), NegSizeReg) 410 .addImm(~(MaxAlign-1)); 411 412 unsigned NegSizeReg1 = NegSizeReg; 413 NegSizeReg = MF.getRegInfo().createVirtualRegister(GPRC); 414 BuildMI(MBB, II, dl, TII.get(PPC::AND), NegSizeReg) 415 .addReg(UnalNegSizeReg, getKillRegState(KillNegSizeReg)) 416 .addReg(NegSizeReg1, RegState::Kill); 417 KillNegSizeReg = true; 418 } 419 420 BuildMI(MBB, II, dl, TII.get(PPC::STWUX), PPC::R1) 421 .addReg(Reg, RegState::Kill) 422 .addReg(PPC::R1) 423 .addReg(NegSizeReg, getKillRegState(KillNegSizeReg)); 424 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), MI.getOperand(0).getReg()) 425 .addReg(PPC::R1) 426 .addImm(maxCallFrameSize); 427 } 428 429 // Discard the DYNALLOC instruction. 430 MBB.erase(II); 431 } 432 433 void PPCRegisterInfo::lowerDynamicAreaOffset( 434 MachineBasicBlock::iterator II) const { 435 // Get the instruction. 436 MachineInstr &MI = *II; 437 // Get the instruction's basic block. 438 MachineBasicBlock &MBB = *MI.getParent(); 439 // Get the basic block's function. 440 MachineFunction &MF = *MBB.getParent(); 441 // Get the frame info. 442 MachineFrameInfo *MFI = MF.getFrameInfo(); 443 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 444 // Get the instruction info. 445 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 446 447 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize(); 448 DebugLoc dl = MI.getDebugLoc(); 449 BuildMI(MBB, II, dl, TII.get(PPC::LI), MI.getOperand(0).getReg()) 450 .addImm(maxCallFrameSize); 451 MBB.erase(II); 452 } 453 454 /// lowerCRSpilling - Generate the code for spilling a CR register. Instead of 455 /// reserving a whole register (R0), we scrounge for one here. This generates 456 /// code like this: 457 /// 458 /// mfcr rA ; Move the conditional register into GPR rA. 459 /// rlwinm rA, rA, SB, 0, 31 ; Shift the bits left so they are in CR0's slot. 460 /// stw rA, FI ; Store rA to the frame. 461 /// 462 void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II, 463 unsigned FrameIndex) const { 464 // Get the instruction. 465 MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset> 466 // Get the instruction's basic block. 467 MachineBasicBlock &MBB = *MI.getParent(); 468 MachineFunction &MF = *MBB.getParent(); 469 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 470 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 471 DebugLoc dl = MI.getDebugLoc(); 472 473 bool LP64 = TM.isPPC64(); 474 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass; 475 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 476 477 unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 478 unsigned SrcReg = MI.getOperand(0).getReg(); 479 480 // We need to store the CR in the low 4-bits of the saved value. First, issue 481 // an MFOCRF to save all of the CRBits and, if needed, kill the SrcReg. 482 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MFOCRF8 : PPC::MFOCRF), Reg) 483 .addReg(SrcReg, getKillRegState(MI.getOperand(0).isKill())); 484 485 // If the saved register wasn't CR0, shift the bits left so that they are in 486 // CR0's slot. 487 if (SrcReg != PPC::CR0) { 488 unsigned Reg1 = Reg; 489 Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 490 491 // rlwinm rA, rA, ShiftBits, 0, 31. 492 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg) 493 .addReg(Reg1, RegState::Kill) 494 .addImm(getEncodingValue(SrcReg) * 4) 495 .addImm(0) 496 .addImm(31); 497 } 498 499 addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::STW8 : PPC::STW)) 500 .addReg(Reg, RegState::Kill), 501 FrameIndex); 502 503 // Discard the pseudo instruction. 504 MBB.erase(II); 505 } 506 507 void PPCRegisterInfo::lowerCRRestore(MachineBasicBlock::iterator II, 508 unsigned FrameIndex) const { 509 // Get the instruction. 510 MachineInstr &MI = *II; // ; <DestReg> = RESTORE_CR <offset> 511 // Get the instruction's basic block. 512 MachineBasicBlock &MBB = *MI.getParent(); 513 MachineFunction &MF = *MBB.getParent(); 514 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 515 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 516 DebugLoc dl = MI.getDebugLoc(); 517 518 bool LP64 = TM.isPPC64(); 519 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass; 520 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 521 522 unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 523 unsigned DestReg = MI.getOperand(0).getReg(); 524 assert(MI.definesRegister(DestReg) && 525 "RESTORE_CR does not define its destination"); 526 527 addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::LWZ8 : PPC::LWZ), 528 Reg), FrameIndex); 529 530 // If the reloaded register isn't CR0, shift the bits right so that they are 531 // in the right CR's slot. 532 if (DestReg != PPC::CR0) { 533 unsigned Reg1 = Reg; 534 Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 535 536 unsigned ShiftBits = getEncodingValue(DestReg)*4; 537 // rlwinm r11, r11, 32-ShiftBits, 0, 31. 538 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg) 539 .addReg(Reg1, RegState::Kill).addImm(32-ShiftBits).addImm(0) 540 .addImm(31); 541 } 542 543 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MTOCRF8 : PPC::MTOCRF), DestReg) 544 .addReg(Reg, RegState::Kill); 545 546 // Discard the pseudo instruction. 547 MBB.erase(II); 548 } 549 550 void PPCRegisterInfo::lowerCRBitSpilling(MachineBasicBlock::iterator II, 551 unsigned FrameIndex) const { 552 // Get the instruction. 553 MachineInstr &MI = *II; // ; SPILL_CRBIT <SrcReg>, <offset> 554 // Get the instruction's basic block. 555 MachineBasicBlock &MBB = *MI.getParent(); 556 MachineFunction &MF = *MBB.getParent(); 557 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 558 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 559 DebugLoc dl = MI.getDebugLoc(); 560 561 bool LP64 = TM.isPPC64(); 562 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass; 563 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 564 565 unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 566 unsigned SrcReg = MI.getOperand(0).getReg(); 567 568 BuildMI(MBB, II, dl, TII.get(TargetOpcode::KILL), 569 getCRFromCRBit(SrcReg)) 570 .addReg(SrcReg, getKillRegState(MI.getOperand(0).isKill())); 571 572 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MFOCRF8 : PPC::MFOCRF), Reg) 573 .addReg(getCRFromCRBit(SrcReg)); 574 575 // If the saved register wasn't CR0LT, shift the bits left so that the bit to 576 // store is the first one. Mask all but that bit. 577 unsigned Reg1 = Reg; 578 Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 579 580 // rlwinm rA, rA, ShiftBits, 0, 0. 581 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg) 582 .addReg(Reg1, RegState::Kill) 583 .addImm(getEncodingValue(SrcReg)) 584 .addImm(0).addImm(0); 585 586 addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::STW8 : PPC::STW)) 587 .addReg(Reg, RegState::Kill), 588 FrameIndex); 589 590 // Discard the pseudo instruction. 591 MBB.erase(II); 592 } 593 594 void PPCRegisterInfo::lowerCRBitRestore(MachineBasicBlock::iterator II, 595 unsigned FrameIndex) const { 596 // Get the instruction. 597 MachineInstr &MI = *II; // ; <DestReg> = RESTORE_CRBIT <offset> 598 // Get the instruction's basic block. 599 MachineBasicBlock &MBB = *MI.getParent(); 600 MachineFunction &MF = *MBB.getParent(); 601 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 602 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 603 DebugLoc dl = MI.getDebugLoc(); 604 605 bool LP64 = TM.isPPC64(); 606 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass; 607 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 608 609 unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 610 unsigned DestReg = MI.getOperand(0).getReg(); 611 assert(MI.definesRegister(DestReg) && 612 "RESTORE_CRBIT does not define its destination"); 613 614 addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::LWZ8 : PPC::LWZ), 615 Reg), FrameIndex); 616 617 BuildMI(MBB, II, dl, TII.get(TargetOpcode::IMPLICIT_DEF), DestReg); 618 619 unsigned RegO = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC); 620 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MFOCRF8 : PPC::MFOCRF), RegO) 621 .addReg(getCRFromCRBit(DestReg)); 622 623 unsigned ShiftBits = getEncodingValue(DestReg); 624 // rlwimi r11, r10, 32-ShiftBits, ..., ... 625 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWIMI8 : PPC::RLWIMI), RegO) 626 .addReg(RegO, RegState::Kill) 627 .addReg(Reg, RegState::Kill) 628 .addImm(ShiftBits ? 32 - ShiftBits : 0) 629 .addImm(ShiftBits) 630 .addImm(ShiftBits); 631 632 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MTOCRF8 : PPC::MTOCRF), 633 getCRFromCRBit(DestReg)) 634 .addReg(RegO, RegState::Kill) 635 // Make sure we have a use dependency all the way through this 636 // sequence of instructions. We can't have the other bits in the CR 637 // modified in between the mfocrf and the mtocrf. 638 .addReg(getCRFromCRBit(DestReg), RegState::Implicit); 639 640 // Discard the pseudo instruction. 641 MBB.erase(II); 642 } 643 644 void PPCRegisterInfo::lowerVRSAVESpilling(MachineBasicBlock::iterator II, 645 unsigned FrameIndex) const { 646 // Get the instruction. 647 MachineInstr &MI = *II; // ; SPILL_VRSAVE <SrcReg>, <offset> 648 // Get the instruction's basic block. 649 MachineBasicBlock &MBB = *MI.getParent(); 650 MachineFunction &MF = *MBB.getParent(); 651 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 652 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 653 DebugLoc dl = MI.getDebugLoc(); 654 655 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 656 unsigned Reg = MF.getRegInfo().createVirtualRegister(GPRC); 657 unsigned SrcReg = MI.getOperand(0).getReg(); 658 659 BuildMI(MBB, II, dl, TII.get(PPC::MFVRSAVEv), Reg) 660 .addReg(SrcReg, getKillRegState(MI.getOperand(0).isKill())); 661 662 addFrameReference( 663 BuildMI(MBB, II, dl, TII.get(PPC::STW)).addReg(Reg, RegState::Kill), 664 FrameIndex); 665 666 // Discard the pseudo instruction. 667 MBB.erase(II); 668 } 669 670 void PPCRegisterInfo::lowerVRSAVERestore(MachineBasicBlock::iterator II, 671 unsigned FrameIndex) const { 672 // Get the instruction. 673 MachineInstr &MI = *II; // ; <DestReg> = RESTORE_VRSAVE <offset> 674 // Get the instruction's basic block. 675 MachineBasicBlock &MBB = *MI.getParent(); 676 MachineFunction &MF = *MBB.getParent(); 677 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 678 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 679 DebugLoc dl = MI.getDebugLoc(); 680 681 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 682 unsigned Reg = MF.getRegInfo().createVirtualRegister(GPRC); 683 unsigned DestReg = MI.getOperand(0).getReg(); 684 assert(MI.definesRegister(DestReg) && 685 "RESTORE_VRSAVE does not define its destination"); 686 687 addFrameReference(BuildMI(MBB, II, dl, TII.get(PPC::LWZ), 688 Reg), FrameIndex); 689 690 BuildMI(MBB, II, dl, TII.get(PPC::MTVRSAVEv), DestReg) 691 .addReg(Reg, RegState::Kill); 692 693 // Discard the pseudo instruction. 694 MBB.erase(II); 695 } 696 697 bool PPCRegisterInfo::hasReservedSpillSlot(const MachineFunction &MF, 698 unsigned Reg, int &FrameIdx) const { 699 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 700 // For the nonvolatile condition registers (CR2, CR3, CR4) in an SVR4 701 // ABI, return true to prevent allocating an additional frame slot. 702 // For 64-bit, the CR save area is at SP+8; the value of FrameIdx = 0 703 // is arbitrary and will be subsequently ignored. For 32-bit, we have 704 // previously created the stack slot if needed, so return its FrameIdx. 705 if (Subtarget.isSVR4ABI() && PPC::CR2 <= Reg && Reg <= PPC::CR4) { 706 if (TM.isPPC64()) 707 FrameIdx = 0; 708 else { 709 const PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>(); 710 FrameIdx = FI->getCRSpillFrameIndex(); 711 } 712 return true; 713 } 714 return false; 715 } 716 717 // Figure out if the offset in the instruction must be a multiple of 4. 718 // This is true for instructions like "STD". 719 static bool usesIXAddr(const MachineInstr &MI) { 720 unsigned OpC = MI.getOpcode(); 721 722 switch (OpC) { 723 default: 724 return false; 725 case PPC::LWA: 726 case PPC::LWA_32: 727 case PPC::LD: 728 case PPC::STD: 729 return true; 730 } 731 } 732 733 // Return the OffsetOperandNo given the FIOperandNum (and the instruction). 734 static unsigned getOffsetONFromFION(const MachineInstr &MI, 735 unsigned FIOperandNum) { 736 // Take into account whether it's an add or mem instruction 737 unsigned OffsetOperandNo = (FIOperandNum == 2) ? 1 : 2; 738 if (MI.isInlineAsm()) 739 OffsetOperandNo = FIOperandNum - 1; 740 else if (MI.getOpcode() == TargetOpcode::STACKMAP || 741 MI.getOpcode() == TargetOpcode::PATCHPOINT) 742 OffsetOperandNo = FIOperandNum + 1; 743 744 return OffsetOperandNo; 745 } 746 747 void 748 PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, 749 int SPAdj, unsigned FIOperandNum, 750 RegScavenger *RS) const { 751 assert(SPAdj == 0 && "Unexpected"); 752 753 // Get the instruction. 754 MachineInstr &MI = *II; 755 // Get the instruction's basic block. 756 MachineBasicBlock &MBB = *MI.getParent(); 757 // Get the basic block's function. 758 MachineFunction &MF = *MBB.getParent(); 759 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 760 // Get the instruction info. 761 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 762 // Get the frame info. 763 MachineFrameInfo *MFI = MF.getFrameInfo(); 764 DebugLoc dl = MI.getDebugLoc(); 765 766 unsigned OffsetOperandNo = getOffsetONFromFION(MI, FIOperandNum); 767 768 // Get the frame index. 769 int FrameIndex = MI.getOperand(FIOperandNum).getIndex(); 770 771 // Get the frame pointer save index. Users of this index are primarily 772 // DYNALLOC instructions. 773 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>(); 774 int FPSI = FI->getFramePointerSaveIndex(); 775 // Get the instruction opcode. 776 unsigned OpC = MI.getOpcode(); 777 778 if ((OpC == PPC::DYNAREAOFFSET || OpC == PPC::DYNAREAOFFSET8)) { 779 lowerDynamicAreaOffset(II); 780 return; 781 } 782 783 // Special case for dynamic alloca. 784 if (FPSI && FrameIndex == FPSI && 785 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) { 786 lowerDynamicAlloc(II); 787 return; 788 } 789 790 // Special case for pseudo-ops SPILL_CR and RESTORE_CR, etc. 791 if (OpC == PPC::SPILL_CR) { 792 lowerCRSpilling(II, FrameIndex); 793 return; 794 } else if (OpC == PPC::RESTORE_CR) { 795 lowerCRRestore(II, FrameIndex); 796 return; 797 } else if (OpC == PPC::SPILL_CRBIT) { 798 lowerCRBitSpilling(II, FrameIndex); 799 return; 800 } else if (OpC == PPC::RESTORE_CRBIT) { 801 lowerCRBitRestore(II, FrameIndex); 802 return; 803 } else if (OpC == PPC::SPILL_VRSAVE) { 804 lowerVRSAVESpilling(II, FrameIndex); 805 return; 806 } else if (OpC == PPC::RESTORE_VRSAVE) { 807 lowerVRSAVERestore(II, FrameIndex); 808 return; 809 } 810 811 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP). 812 MI.getOperand(FIOperandNum).ChangeToRegister( 813 FrameIndex < 0 ? getBaseRegister(MF) : getFrameRegister(MF), false); 814 815 // Figure out if the offset in the instruction is shifted right two bits. 816 bool isIXAddr = usesIXAddr(MI); 817 818 // If the instruction is not present in ImmToIdxMap, then it has no immediate 819 // form (and must be r+r). 820 bool noImmForm = !MI.isInlineAsm() && OpC != TargetOpcode::STACKMAP && 821 OpC != TargetOpcode::PATCHPOINT && !ImmToIdxMap.count(OpC); 822 823 // Now add the frame object offset to the offset from r1. 824 int Offset = MFI->getObjectOffset(FrameIndex); 825 Offset += MI.getOperand(OffsetOperandNo).getImm(); 826 827 // If we're not using a Frame Pointer that has been set to the value of the 828 // SP before having the stack size subtracted from it, then add the stack size 829 // to Offset to get the correct offset. 830 // Naked functions have stack size 0, although getStackSize may not reflect 831 // that because we didn't call all the pieces that compute it for naked 832 // functions. 833 if (!MF.getFunction()->hasFnAttribute(Attribute::Naked)) { 834 if (!(hasBasePointer(MF) && FrameIndex < 0)) 835 Offset += MFI->getStackSize(); 836 } 837 838 // If we can, encode the offset directly into the instruction. If this is a 839 // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If 840 // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits 841 // clear can be encoded. This is extremely uncommon, because normally you 842 // only "std" to a stack slot that is at least 4-byte aligned, but it can 843 // happen in invalid code. 844 assert(OpC != PPC::DBG_VALUE && 845 "This should be handled in a target-independent way"); 846 if (!noImmForm && ((isInt<16>(Offset) && (!isIXAddr || (Offset & 3) == 0)) || 847 OpC == TargetOpcode::STACKMAP || 848 OpC == TargetOpcode::PATCHPOINT)) { 849 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset); 850 return; 851 } 852 853 // The offset doesn't fit into a single register, scavenge one to build the 854 // offset in. 855 856 bool is64Bit = TM.isPPC64(); 857 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass; 858 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass; 859 const TargetRegisterClass *RC = is64Bit ? G8RC : GPRC; 860 unsigned SRegHi = MF.getRegInfo().createVirtualRegister(RC), 861 SReg = MF.getRegInfo().createVirtualRegister(RC); 862 863 // Insert a set of rA with the full offset value before the ld, st, or add 864 BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::LIS8 : PPC::LIS), SRegHi) 865 .addImm(Offset >> 16); 866 BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::ORI8 : PPC::ORI), SReg) 867 .addReg(SRegHi, RegState::Kill) 868 .addImm(Offset); 869 870 // Convert into indexed form of the instruction: 871 // 872 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0 873 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0 874 unsigned OperandBase; 875 876 if (noImmForm) 877 OperandBase = 1; 878 else if (OpC != TargetOpcode::INLINEASM) { 879 assert(ImmToIdxMap.count(OpC) && 880 "No indexed form of load or store available!"); 881 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second; 882 MI.setDesc(TII.get(NewOpcode)); 883 OperandBase = 1; 884 } else { 885 OperandBase = OffsetOperandNo; 886 } 887 888 unsigned StackReg = MI.getOperand(FIOperandNum).getReg(); 889 MI.getOperand(OperandBase).ChangeToRegister(StackReg, false); 890 MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false, false, true); 891 } 892 893 unsigned PPCRegisterInfo::getFrameRegister(const MachineFunction &MF) const { 894 const PPCFrameLowering *TFI = getFrameLowering(MF); 895 896 if (!TM.isPPC64()) 897 return TFI->hasFP(MF) ? PPC::R31 : PPC::R1; 898 else 899 return TFI->hasFP(MF) ? PPC::X31 : PPC::X1; 900 } 901 902 unsigned PPCRegisterInfo::getBaseRegister(const MachineFunction &MF) const { 903 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 904 if (!hasBasePointer(MF)) 905 return getFrameRegister(MF); 906 907 if (TM.isPPC64()) 908 return PPC::X30; 909 910 if (Subtarget.isSVR4ABI() && 911 TM.getRelocationModel() == Reloc::PIC_) 912 return PPC::R29; 913 914 return PPC::R30; 915 } 916 917 bool PPCRegisterInfo::hasBasePointer(const MachineFunction &MF) const { 918 if (!EnableBasePointer) 919 return false; 920 if (AlwaysBasePointer) 921 return true; 922 923 // If we need to realign the stack, then the stack pointer can no longer 924 // serve as an offset into the caller's stack space. As a result, we need a 925 // base pointer. 926 return needsStackRealignment(MF); 927 } 928 929 /// Returns true if the instruction's frame index 930 /// reference would be better served by a base register other than FP 931 /// or SP. Used by LocalStackFrameAllocation to determine which frame index 932 /// references it should create new base registers for. 933 bool PPCRegisterInfo:: 934 needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const { 935 assert(Offset < 0 && "Local offset must be negative"); 936 937 // It's the load/store FI references that cause issues, as it can be difficult 938 // to materialize the offset if it won't fit in the literal field. Estimate 939 // based on the size of the local frame and some conservative assumptions 940 // about the rest of the stack frame (note, this is pre-regalloc, so 941 // we don't know everything for certain yet) whether this offset is likely 942 // to be out of range of the immediate. Return true if so. 943 944 // We only generate virtual base registers for loads and stores that have 945 // an r+i form. Return false for everything else. 946 unsigned OpC = MI->getOpcode(); 947 if (!ImmToIdxMap.count(OpC)) 948 return false; 949 950 // Don't generate a new virtual base register just to add zero to it. 951 if ((OpC == PPC::ADDI || OpC == PPC::ADDI8) && 952 MI->getOperand(2).getImm() == 0) 953 return false; 954 955 MachineBasicBlock &MBB = *MI->getParent(); 956 MachineFunction &MF = *MBB.getParent(); 957 const PPCFrameLowering *TFI = getFrameLowering(MF); 958 unsigned StackEst = TFI->determineFrameLayout(MF, false, true); 959 960 // If we likely don't need a stack frame, then we probably don't need a 961 // virtual base register either. 962 if (!StackEst) 963 return false; 964 965 // Estimate an offset from the stack pointer. 966 // The incoming offset is relating to the SP at the start of the function, 967 // but when we access the local it'll be relative to the SP after local 968 // allocation, so adjust our SP-relative offset by that allocation size. 969 Offset += StackEst; 970 971 // The frame pointer will point to the end of the stack, so estimate the 972 // offset as the difference between the object offset and the FP location. 973 return !isFrameOffsetLegal(MI, getBaseRegister(MF), Offset); 974 } 975 976 /// Insert defining instruction(s) for BaseReg to 977 /// be a pointer to FrameIdx at the beginning of the basic block. 978 void PPCRegisterInfo:: 979 materializeFrameBaseRegister(MachineBasicBlock *MBB, 980 unsigned BaseReg, int FrameIdx, 981 int64_t Offset) const { 982 unsigned ADDriOpc = TM.isPPC64() ? PPC::ADDI8 : PPC::ADDI; 983 984 MachineBasicBlock::iterator Ins = MBB->begin(); 985 DebugLoc DL; // Defaults to "unknown" 986 if (Ins != MBB->end()) 987 DL = Ins->getDebugLoc(); 988 989 const MachineFunction &MF = *MBB->getParent(); 990 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 991 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 992 const MCInstrDesc &MCID = TII.get(ADDriOpc); 993 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo(); 994 MRI.constrainRegClass(BaseReg, TII.getRegClass(MCID, 0, this, MF)); 995 996 BuildMI(*MBB, Ins, DL, MCID, BaseReg) 997 .addFrameIndex(FrameIdx).addImm(Offset); 998 } 999 1000 void PPCRegisterInfo::resolveFrameIndex(MachineInstr &MI, unsigned BaseReg, 1001 int64_t Offset) const { 1002 unsigned FIOperandNum = 0; 1003 while (!MI.getOperand(FIOperandNum).isFI()) { 1004 ++FIOperandNum; 1005 assert(FIOperandNum < MI.getNumOperands() && 1006 "Instr doesn't have FrameIndex operand!"); 1007 } 1008 1009 MI.getOperand(FIOperandNum).ChangeToRegister(BaseReg, false); 1010 unsigned OffsetOperandNo = getOffsetONFromFION(MI, FIOperandNum); 1011 Offset += MI.getOperand(OffsetOperandNo).getImm(); 1012 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset); 1013 1014 MachineBasicBlock &MBB = *MI.getParent(); 1015 MachineFunction &MF = *MBB.getParent(); 1016 const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>(); 1017 const TargetInstrInfo &TII = *Subtarget.getInstrInfo(); 1018 const MCInstrDesc &MCID = MI.getDesc(); 1019 MachineRegisterInfo &MRI = MF.getRegInfo(); 1020 MRI.constrainRegClass(BaseReg, 1021 TII.getRegClass(MCID, FIOperandNum, this, MF)); 1022 } 1023 1024 bool PPCRegisterInfo::isFrameOffsetLegal(const MachineInstr *MI, 1025 unsigned BaseReg, 1026 int64_t Offset) const { 1027 unsigned FIOperandNum = 0; 1028 while (!MI->getOperand(FIOperandNum).isFI()) { 1029 ++FIOperandNum; 1030 assert(FIOperandNum < MI->getNumOperands() && 1031 "Instr doesn't have FrameIndex operand!"); 1032 } 1033 1034 unsigned OffsetOperandNo = getOffsetONFromFION(*MI, FIOperandNum); 1035 Offset += MI->getOperand(OffsetOperandNo).getImm(); 1036 1037 return MI->getOpcode() == PPC::DBG_VALUE || // DBG_VALUE is always Reg+Imm 1038 MI->getOpcode() == TargetOpcode::STACKMAP || 1039 MI->getOpcode() == TargetOpcode::PATCHPOINT || 1040 (isInt<16>(Offset) && (!usesIXAddr(*MI) || (Offset & 3) == 0)); 1041 } 1042