1 //===-- PPCRegisterInfo.cpp - PowerPC Register Information ----------------===//
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 PowerPC implementation of the TargetRegisterInfo
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "reginfo"
16 #include "PPCRegisterInfo.h"
18 #include "PPCInstrBuilder.h"
19 #include "PPCMachineFunctionInfo.h"
20 #include "PPCFrameLowering.h"
21 #include "PPCSubtarget.h"
22 #include "llvm/CallingConv.h"
23 #include "llvm/Constants.h"
24 #include "llvm/Function.h"
25 #include "llvm/Type.h"
26 #include "llvm/CodeGen/ValueTypes.h"
27 #include "llvm/CodeGen/MachineInstrBuilder.h"
28 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "llvm/CodeGen/MachineFunction.h"
30 #include "llvm/CodeGen/MachineFrameInfo.h"
31 #include "llvm/CodeGen/MachineRegisterInfo.h"
32 #include "llvm/CodeGen/RegisterScavenging.h"
33 #include "llvm/Target/TargetFrameLowering.h"
34 #include "llvm/Target/TargetInstrInfo.h"
35 #include "llvm/Target/TargetMachine.h"
36 #include "llvm/Target/TargetOptions.h"
37 #include "llvm/Support/CommandLine.h"
38 #include "llvm/Support/Debug.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/MathExtras.h"
41 #include "llvm/Support/raw_ostream.h"
42 #include "llvm/ADT/BitVector.h"
43 #include "llvm/ADT/STLExtras.h"
46 #define GET_REGINFO_TARGET_DESC
47 #include "PPCGenRegisterInfo.inc"
50 cl::opt<bool> DisablePPC32RS("disable-ppc32-regscavenger",
52 cl::desc("Disable PPC32 register scavenger"),
54 cl::opt<bool> DisablePPC64RS("disable-ppc64-regscavenger",
56 cl::desc("Disable PPC64 register scavenger"),
62 // FIXME (64-bit): Should be inlined.
64 PPCRegisterInfo::requiresRegisterScavenging(const MachineFunction &) const {
65 return ((!DisablePPC32RS && !Subtarget.isPPC64()) ||
66 (!DisablePPC64RS && Subtarget.isPPC64()));
69 PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
70 const TargetInstrInfo &tii)
71 : PPCGenRegisterInfo(ST.isPPC64() ? PPC::LR8 : PPC::LR,
73 ST.isPPC64() ? 0 : 1),
74 Subtarget(ST), TII(tii) {
75 ImmToIdxMap[PPC::LD] = PPC::LDX; ImmToIdxMap[PPC::STD] = PPC::STDX;
76 ImmToIdxMap[PPC::LBZ] = PPC::LBZX; ImmToIdxMap[PPC::STB] = PPC::STBX;
77 ImmToIdxMap[PPC::LHZ] = PPC::LHZX; ImmToIdxMap[PPC::LHA] = PPC::LHAX;
78 ImmToIdxMap[PPC::LWZ] = PPC::LWZX; ImmToIdxMap[PPC::LWA] = PPC::LWAX;
79 ImmToIdxMap[PPC::LFS] = PPC::LFSX; ImmToIdxMap[PPC::LFD] = PPC::LFDX;
80 ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX;
81 ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX;
82 ImmToIdxMap[PPC::ADDI] = PPC::ADD4;
85 ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8;
86 ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8;
87 ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8;
88 ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX;
89 ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
93 PPCRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
94 return requiresRegisterScavenging(MF);
98 /// getPointerRegClass - Return the register class to use to hold pointers.
99 /// This is used for addressing modes.
100 const TargetRegisterClass *
101 PPCRegisterInfo::getPointerRegClass(unsigned Kind) const {
102 if (Subtarget.isPPC64())
103 return &PPC::G8RCRegClass;
104 return &PPC::GPRCRegClass;
108 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
109 if (Subtarget.isDarwinABI())
110 return Subtarget.isPPC64() ? CSR_Darwin64_SaveList :
111 CSR_Darwin32_SaveList;
113 return Subtarget.isPPC64() ? CSR_SVR464_SaveList : CSR_SVR432_SaveList;
117 PPCRegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
118 if (Subtarget.isDarwinABI())
119 return Subtarget.isPPC64() ? CSR_Darwin64_RegMask :
120 CSR_Darwin32_RegMask;
122 return Subtarget.isPPC64() ? CSR_SVR464_RegMask : CSR_SVR432_RegMask;
125 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
126 BitVector Reserved(getNumRegs());
127 const PPCFrameLowering *PPCFI =
128 static_cast<const PPCFrameLowering*>(MF.getTarget().getFrameLowering());
130 Reserved.set(PPC::R0);
131 Reserved.set(PPC::R1);
132 Reserved.set(PPC::LR);
133 Reserved.set(PPC::LR8);
134 Reserved.set(PPC::RM);
136 // The SVR4 ABI reserves r2 and r13
137 if (Subtarget.isSVR4ABI()) {
138 Reserved.set(PPC::R2); // System-reserved register
139 Reserved.set(PPC::R13); // Small Data Area pointer register
141 // Reserve R2 on Darwin to hack around the problem of save/restore of CR
142 // when the stack frame is too big to address directly; we need two regs.
144 if (Subtarget.isDarwinABI()) {
145 Reserved.set(PPC::R2);
148 // On PPC64, r13 is the thread pointer. Never allocate this register.
149 // Note that this is over conservative, as it also prevents allocation of R31
150 // when the FP is not needed.
151 if (Subtarget.isPPC64()) {
152 Reserved.set(PPC::R13);
153 Reserved.set(PPC::R31);
155 Reserved.set(PPC::X0);
156 Reserved.set(PPC::X1);
157 Reserved.set(PPC::X13);
158 Reserved.set(PPC::X31);
160 // The 64-bit SVR4 ABI reserves r2 for the TOC pointer.
161 if (Subtarget.isSVR4ABI()) {
162 Reserved.set(PPC::X2);
164 // Reserve X2 on Darwin to hack around the problem of save/restore of CR
165 // when the stack frame is too big to address directly; we need two regs.
167 if (Subtarget.isDarwinABI()) {
168 Reserved.set(PPC::X2);
172 if (PPCFI->needsFP(MF))
173 Reserved.set(PPC::R31);
179 PPCRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
180 MachineFunction &MF) const {
181 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
182 const unsigned DefaultSafety = 1;
184 switch (RC->getID()) {
187 case PPC::G8RCRegClassID:
188 case PPC::GPRCRegClassID: {
189 unsigned FP = TFI->hasFP(MF) ? 1 : 0;
190 return 32 - FP - DefaultSafety;
192 case PPC::F8RCRegClassID:
193 case PPC::F4RCRegClassID:
194 case PPC::VRRCRegClassID:
195 return 32 - DefaultSafety;
196 case PPC::CRRCRegClassID:
197 return 8 - DefaultSafety;
201 //===----------------------------------------------------------------------===//
202 // Stack Frame Processing methods
203 //===----------------------------------------------------------------------===//
205 void PPCRegisterInfo::
206 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
207 MachineBasicBlock::iterator I) const {
208 if (MF.getTarget().Options.GuaranteedTailCallOpt &&
209 I->getOpcode() == PPC::ADJCALLSTACKUP) {
210 // Add (actually subtract) back the amount the callee popped on return.
211 if (int CalleeAmt = I->getOperand(1).getImm()) {
212 bool is64Bit = Subtarget.isPPC64();
214 unsigned StackReg = is64Bit ? PPC::X1 : PPC::R1;
215 unsigned TmpReg = is64Bit ? PPC::X0 : PPC::R0;
216 unsigned ADDIInstr = is64Bit ? PPC::ADDI8 : PPC::ADDI;
217 unsigned ADDInstr = is64Bit ? PPC::ADD8 : PPC::ADD4;
218 unsigned LISInstr = is64Bit ? PPC::LIS8 : PPC::LIS;
219 unsigned ORIInstr = is64Bit ? PPC::ORI8 : PPC::ORI;
220 MachineInstr *MI = I;
221 DebugLoc dl = MI->getDebugLoc();
223 if (isInt<16>(CalleeAmt)) {
224 BuildMI(MBB, I, dl, TII.get(ADDIInstr), StackReg)
225 .addReg(StackReg, RegState::Kill)
228 MachineBasicBlock::iterator MBBI = I;
229 BuildMI(MBB, MBBI, dl, TII.get(LISInstr), TmpReg)
230 .addImm(CalleeAmt >> 16);
231 BuildMI(MBB, MBBI, dl, TII.get(ORIInstr), TmpReg)
232 .addReg(TmpReg, RegState::Kill)
233 .addImm(CalleeAmt & 0xFFFF);
234 BuildMI(MBB, MBBI, dl, TII.get(ADDInstr), StackReg)
235 .addReg(StackReg, RegState::Kill)
240 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
244 /// findScratchRegister - Find a 'free' PPC register. Try for a call-clobbered
245 /// register first and then a spilled callee-saved register if that fails.
247 unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
248 const TargetRegisterClass *RC, int SPAdj) {
249 assert(RS && "Register scavenging must be on");
250 unsigned Reg = RS->FindUnusedReg(RC);
251 // FIXME: move ARM callee-saved reg scan to target independent code, then
252 // search for already spilled CS register here.
254 Reg = RS->scavengeRegister(RC, II, SPAdj);
258 /// lowerDynamicAlloc - Generate the code for allocating an object in the
259 /// current frame. The sequence of code with be in the general form
261 /// addi R0, SP, \#frameSize ; get the address of the previous frame
262 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
263 /// addi Rnew, SP, \#maxCalFrameSize ; get the top of the allocation
265 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
266 int SPAdj, RegScavenger *RS) const {
267 // Get the instruction.
268 MachineInstr &MI = *II;
269 // Get the instruction's basic block.
270 MachineBasicBlock &MBB = *MI.getParent();
271 // Get the basic block's function.
272 MachineFunction &MF = *MBB.getParent();
273 // Get the frame info.
274 MachineFrameInfo *MFI = MF.getFrameInfo();
275 // Determine whether 64-bit pointers are used.
276 bool LP64 = Subtarget.isPPC64();
277 DebugLoc dl = MI.getDebugLoc();
279 // Get the maximum call stack size.
280 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
281 // Get the total frame size.
282 unsigned FrameSize = MFI->getStackSize();
284 // Get stack alignments.
285 unsigned TargetAlign = MF.getTarget().getFrameLowering()->getStackAlignment();
286 unsigned MaxAlign = MFI->getMaxAlignment();
287 if (MaxAlign > TargetAlign)
288 report_fatal_error("Dynamic alloca with large aligns not supported");
290 // Determine the previous frame's address. If FrameSize can't be
291 // represented as 16 bits or we need special alignment, then we load the
292 // previous frame's address from 0(SP). Why not do an addis of the hi?
293 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
294 // Constructing the constant and adding would take 3 instructions.
295 // Fortunately, a frame greater than 32K is rare.
296 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
297 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
298 const TargetRegisterClass *RC = LP64 ? G8RC : GPRC;
300 // FIXME (64-bit): Use "findScratchRegister"
302 if (requiresRegisterScavenging(MF))
303 Reg = findScratchRegister(II, RS, RC, SPAdj);
307 if (MaxAlign < TargetAlign && isInt<16>(FrameSize)) {
308 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), Reg)
312 if (requiresRegisterScavenging(MF)) // FIXME (64-bit): Use "true" part.
313 BuildMI(MBB, II, dl, TII.get(PPC::LD), Reg)
317 BuildMI(MBB, II, dl, TII.get(PPC::LD), PPC::X0)
321 BuildMI(MBB, II, dl, TII.get(PPC::LWZ), Reg)
326 // Grow the stack and update the stack pointer link, then determine the
327 // address of new allocated space.
329 if (requiresRegisterScavenging(MF)) // FIXME (64-bit): Use "true" part.
330 BuildMI(MBB, II, dl, TII.get(PPC::STDUX))
331 .addReg(Reg, RegState::Kill)
332 .addReg(PPC::X1, RegState::Define)
333 .addReg(MI.getOperand(1).getReg());
335 BuildMI(MBB, II, dl, TII.get(PPC::STDUX))
336 .addReg(PPC::X0, RegState::Kill)
337 .addReg(PPC::X1, RegState::Define)
338 .addReg(MI.getOperand(1).getReg());
340 if (!MI.getOperand(1).isKill())
341 BuildMI(MBB, II, dl, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
343 .addImm(maxCallFrameSize);
345 // Implicitly kill the register.
346 BuildMI(MBB, II, dl, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
348 .addImm(maxCallFrameSize)
349 .addReg(MI.getOperand(1).getReg(), RegState::ImplicitKill);
351 BuildMI(MBB, II, dl, TII.get(PPC::STWUX))
352 .addReg(Reg, RegState::Kill)
353 .addReg(PPC::R1, RegState::Define)
354 .addReg(MI.getOperand(1).getReg());
356 if (!MI.getOperand(1).isKill())
357 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
359 .addImm(maxCallFrameSize);
361 // Implicitly kill the register.
362 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
364 .addImm(maxCallFrameSize)
365 .addReg(MI.getOperand(1).getReg(), RegState::ImplicitKill);
368 // Discard the DYNALLOC instruction.
372 /// lowerCRSpilling - Generate the code for spilling a CR register. Instead of
373 /// reserving a whole register (R0), we scrounge for one here. This generates
376 /// mfcr rA ; Move the conditional register into GPR rA.
377 /// rlwinm rA, rA, SB, 0, 31 ; Shift the bits left so they are in CR0's slot.
378 /// stw rA, FI ; Store rA to the frame.
380 void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
381 unsigned FrameIndex, int SPAdj,
382 RegScavenger *RS) const {
383 // Get the instruction.
384 MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset>
385 // Get the instruction's basic block.
386 MachineBasicBlock &MBB = *MI.getParent();
387 DebugLoc dl = MI.getDebugLoc();
389 // FIXME: Once LLVM supports creating virtual registers here, or the register
390 // scavenger can return multiple registers, stop using reserved registers
395 bool LP64 = Subtarget.isPPC64();
396 unsigned Reg = Subtarget.isDarwinABI() ? (LP64 ? PPC::X2 : PPC::R2) :
397 (LP64 ? PPC::X0 : PPC::R0);
398 unsigned SrcReg = MI.getOperand(0).getReg();
400 // We need to store the CR in the low 4-bits of the saved value. First, issue
401 // an MFCRpsued to save all of the CRBits and, if needed, kill the SrcReg.
402 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MFCR8pseud : PPC::MFCRpseud), Reg)
403 .addReg(SrcReg, getKillRegState(MI.getOperand(0).isKill()));
405 // If the saved register wasn't CR0, shift the bits left so that they are in
407 if (SrcReg != PPC::CR0)
408 // rlwinm rA, rA, ShiftBits, 0, 31.
409 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg)
410 .addReg(Reg, RegState::Kill)
411 .addImm(getPPCRegisterNumbering(SrcReg) * 4)
415 addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::STW8 : PPC::STW))
416 .addReg(Reg, getKillRegState(MI.getOperand(1).getImm())),
419 // Discard the pseudo instruction.
423 void PPCRegisterInfo::lowerCRRestore(MachineBasicBlock::iterator II,
424 unsigned FrameIndex, int SPAdj,
425 RegScavenger *RS) const {
426 // Get the instruction.
427 MachineInstr &MI = *II; // ; <DestReg> = RESTORE_CR <offset>
428 // Get the instruction's basic block.
429 MachineBasicBlock &MBB = *MI.getParent();
430 DebugLoc dl = MI.getDebugLoc();
432 // FIXME: Once LLVM supports creating virtual registers here, or the register
433 // scavenger can return multiple registers, stop using reserved registers
438 bool LP64 = Subtarget.isPPC64();
439 unsigned Reg = Subtarget.isDarwinABI() ? (LP64 ? PPC::X2 : PPC::R2) :
440 (LP64 ? PPC::X0 : PPC::R0);
441 unsigned DestReg = MI.getOperand(0).getReg();
442 assert(MI.definesRegister(DestReg) &&
443 "RESTORE_CR does not define its destination");
445 addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::LWZ8 : PPC::LWZ),
448 // If the reloaded register isn't CR0, shift the bits right so that they are
449 // in the right CR's slot.
450 if (DestReg != PPC::CR0) {
451 unsigned ShiftBits = getPPCRegisterNumbering(DestReg)*4;
452 // rlwinm r11, r11, 32-ShiftBits, 0, 31.
453 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg)
454 .addReg(Reg).addImm(32-ShiftBits).addImm(0)
458 BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MTCRF8 : PPC::MTCRF), DestReg)
461 // Discard the pseudo instruction.
466 PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
467 int SPAdj, RegScavenger *RS) const {
468 assert(SPAdj == 0 && "Unexpected");
470 // Get the instruction.
471 MachineInstr &MI = *II;
472 // Get the instruction's basic block.
473 MachineBasicBlock &MBB = *MI.getParent();
474 // Get the basic block's function.
475 MachineFunction &MF = *MBB.getParent();
476 // Get the frame info.
477 MachineFrameInfo *MFI = MF.getFrameInfo();
478 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
479 DebugLoc dl = MI.getDebugLoc();
481 // Find out which operand is the frame index.
482 unsigned FIOperandNo = 0;
483 while (!MI.getOperand(FIOperandNo).isFI()) {
485 assert(FIOperandNo != MI.getNumOperands() &&
486 "Instr doesn't have FrameIndex operand!");
488 // Take into account whether it's an add or mem instruction
489 unsigned OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
490 if (MI.isInlineAsm())
491 OffsetOperandNo = FIOperandNo-1;
493 // Get the frame index.
494 int FrameIndex = MI.getOperand(FIOperandNo).getIndex();
496 // Get the frame pointer save index. Users of this index are primarily
497 // DYNALLOC instructions.
498 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
499 int FPSI = FI->getFramePointerSaveIndex();
500 // Get the instruction opcode.
501 unsigned OpC = MI.getOpcode();
503 // Special case for dynamic alloca.
504 if (FPSI && FrameIndex == FPSI &&
505 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
506 lowerDynamicAlloc(II, SPAdj, RS);
510 // Special case for pseudo-ops SPILL_CR and RESTORE_CR.
511 if (requiresRegisterScavenging(MF)) {
512 if (OpC == PPC::SPILL_CR) {
513 lowerCRSpilling(II, FrameIndex, SPAdj, RS);
515 } else if (OpC == PPC::RESTORE_CR) {
516 lowerCRRestore(II, FrameIndex, SPAdj, RS);
521 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
523 bool is64Bit = Subtarget.isPPC64();
524 MI.getOperand(FIOperandNo).ChangeToRegister(TFI->hasFP(MF) ?
525 (is64Bit ? PPC::X31 : PPC::R31) :
526 (is64Bit ? PPC::X1 : PPC::R1),
529 // Figure out if the offset in the instruction is shifted right two bits. This
530 // is true for instructions like "STD", which the machine implicitly adds two
532 bool isIXAddr = false;
542 // Now add the frame object offset to the offset from r1.
543 int Offset = MFI->getObjectOffset(FrameIndex);
545 Offset += MI.getOperand(OffsetOperandNo).getImm();
547 Offset += MI.getOperand(OffsetOperandNo).getImm() << 2;
549 // If we're not using a Frame Pointer that has been set to the value of the
550 // SP before having the stack size subtracted from it, then add the stack size
551 // to Offset to get the correct offset.
552 // Naked functions have stack size 0, although getStackSize may not reflect that
553 // because we didn't call all the pieces that compute it for naked functions.
554 if (!MF.getFunction()->hasFnAttr(Attribute::Naked))
555 Offset += MFI->getStackSize();
557 // If we can, encode the offset directly into the instruction. If this is a
558 // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If
559 // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits
560 // clear can be encoded. This is extremely uncommon, because normally you
561 // only "std" to a stack slot that is at least 4-byte aligned, but it can
562 // happen in invalid code.
563 if (OpC == PPC::DBG_VALUE || // DBG_VALUE is always Reg+Imm
564 (isInt<16>(Offset) && (!isIXAddr || (Offset & 3) == 0))) {
566 Offset >>= 2; // The actual encoded value has the low two bits zero.
567 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
571 // The offset doesn't fit into a single register, scavenge one to build the
575 if (requiresRegisterScavenging(MF)) {
576 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
577 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
578 SReg = findScratchRegister(II, RS, is64Bit ? G8RC : GPRC, SPAdj);
580 SReg = is64Bit ? PPC::X0 : PPC::R0;
582 // Insert a set of rA with the full offset value before the ld, st, or add
583 BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::LIS8 : PPC::LIS), SReg)
584 .addImm(Offset >> 16);
585 BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::ORI8 : PPC::ORI), SReg)
586 .addReg(SReg, RegState::Kill)
589 // Convert into indexed form of the instruction:
591 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
592 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
593 unsigned OperandBase;
595 if (OpC != TargetOpcode::INLINEASM) {
596 assert(ImmToIdxMap.count(OpC) &&
597 "No indexed form of load or store available!");
598 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
599 MI.setDesc(TII.get(NewOpcode));
602 OperandBase = OffsetOperandNo;
605 unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
606 MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
607 MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false, false, true);
610 unsigned PPCRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
611 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
613 if (!Subtarget.isPPC64())
614 return TFI->hasFP(MF) ? PPC::R31 : PPC::R1;
616 return TFI->hasFP(MF) ? PPC::X31 : PPC::X1;
619 unsigned PPCRegisterInfo::getEHExceptionRegister() const {
620 return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
623 unsigned PPCRegisterInfo::getEHHandlerRegister() const {
624 return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;