1 //===- PPCRegisterInfo.cpp - PowerPC Register Information -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the PowerPC implementation of the MRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "reginfo"
16 #include "PPCInstrBuilder.h"
17 #include "PPCMachineFunctionInfo.h"
18 #include "PPCRegisterInfo.h"
19 #include "PPCFrameInfo.h"
20 #include "PPCSubtarget.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Type.h"
23 #include "llvm/CodeGen/ValueTypes.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/MachineFunction.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineLocation.h"
29 #include "llvm/CodeGen/SelectionDAGNodes.h"
30 #include "llvm/Target/TargetFrameInfo.h"
31 #include "llvm/Target/TargetInstrInfo.h"
32 #include "llvm/Target/TargetMachine.h"
33 #include "llvm/Target/TargetOptions.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/MathExtras.h"
37 #include "llvm/ADT/BitVector.h"
38 #include "llvm/ADT/STLExtras.h"
42 /// getRegisterNumbering - Given the enum value for some register, e.g.
43 /// PPC::F14, return the number that it corresponds to (e.g. 14).
44 unsigned PPCRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
47 case R0 : case X0 : case F0 : case V0 : case CR0: return 0;
48 case R1 : case X1 : case F1 : case V1 : case CR1: return 1;
49 case R2 : case X2 : case F2 : case V2 : case CR2: return 2;
50 case R3 : case X3 : case F3 : case V3 : case CR3: return 3;
51 case R4 : case X4 : case F4 : case V4 : case CR4: return 4;
52 case R5 : case X5 : case F5 : case V5 : case CR5: return 5;
53 case R6 : case X6 : case F6 : case V6 : case CR6: return 6;
54 case R7 : case X7 : case F7 : case V7 : case CR7: return 7;
55 case R8 : case X8 : case F8 : case V8 : return 8;
56 case R9 : case X9 : case F9 : case V9 : return 9;
57 case R10: case X10: case F10: case V10: return 10;
58 case R11: case X11: case F11: case V11: return 11;
59 case R12: case X12: case F12: case V12: return 12;
60 case R13: case X13: case F13: case V13: return 13;
61 case R14: case X14: case F14: case V14: return 14;
62 case R15: case X15: case F15: case V15: return 15;
63 case R16: case X16: case F16: case V16: return 16;
64 case R17: case X17: case F17: case V17: return 17;
65 case R18: case X18: case F18: case V18: return 18;
66 case R19: case X19: case F19: case V19: return 19;
67 case R20: case X20: case F20: case V20: return 20;
68 case R21: case X21: case F21: case V21: return 21;
69 case R22: case X22: case F22: case V22: return 22;
70 case R23: case X23: case F23: case V23: return 23;
71 case R24: case X24: case F24: case V24: return 24;
72 case R25: case X25: case F25: case V25: return 25;
73 case R26: case X26: case F26: case V26: return 26;
74 case R27: case X27: case F27: case V27: return 27;
75 case R28: case X28: case F28: case V28: return 28;
76 case R29: case X29: case F29: case V29: return 29;
77 case R30: case X30: case F30: case V30: return 30;
78 case R31: case X31: case F31: case V31: return 31;
80 cerr << "Unhandled reg in PPCRegisterInfo::getRegisterNumbering!\n";
85 PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
86 const TargetInstrInfo &tii)
87 : PPCGenRegisterInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
88 Subtarget(ST), TII(tii) {
89 ImmToIdxMap[PPC::LD] = PPC::LDX; ImmToIdxMap[PPC::STD] = PPC::STDX;
90 ImmToIdxMap[PPC::LBZ] = PPC::LBZX; ImmToIdxMap[PPC::STB] = PPC::STBX;
91 ImmToIdxMap[PPC::LHZ] = PPC::LHZX; ImmToIdxMap[PPC::LHA] = PPC::LHAX;
92 ImmToIdxMap[PPC::LWZ] = PPC::LWZX; ImmToIdxMap[PPC::LWA] = PPC::LWAX;
93 ImmToIdxMap[PPC::LFS] = PPC::LFSX; ImmToIdxMap[PPC::LFD] = PPC::LFDX;
94 ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX;
95 ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX;
96 ImmToIdxMap[PPC::ADDI] = PPC::ADD4;
99 ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8;
100 ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8;
101 ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8;
102 ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX;
103 ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
106 static void StoreRegToStackSlot(const TargetInstrInfo &TII,
107 unsigned SrcReg, int FrameIdx,
108 const TargetRegisterClass *RC,
109 SmallVector<MachineInstr*, 4> &NewMIs) {
110 if (RC == PPC::GPRCRegisterClass) {
111 if (SrcReg != PPC::LR) {
112 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STW))
113 .addReg(SrcReg, false, false, true), FrameIdx));
115 // FIXME: this spills LR immediately to memory in one step. To do this,
116 // we use R11, which we know cannot be used in the prolog/epilog. This is
118 NewMIs.push_back(BuildMI(TII.get(PPC::MFLR), PPC::R11));
119 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STW))
120 .addReg(PPC::R11, false, false, true), FrameIdx));
122 } else if (RC == PPC::G8RCRegisterClass) {
123 if (SrcReg != PPC::LR8) {
124 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STD))
125 .addReg(SrcReg, false, false, true), FrameIdx));
127 // FIXME: this spills LR immediately to memory in one step. To do this,
128 // we use R11, which we know cannot be used in the prolog/epilog. This is
130 NewMIs.push_back(BuildMI(TII.get(PPC::MFLR8), PPC::X11));
131 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STD))
132 .addReg(PPC::X11, false, false, true), FrameIdx));
134 } else if (RC == PPC::F8RCRegisterClass) {
135 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STFD))
136 .addReg(SrcReg, false, false, true), FrameIdx));
137 } else if (RC == PPC::F4RCRegisterClass) {
138 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STFS))
139 .addReg(SrcReg, false, false, true), FrameIdx));
140 } else if (RC == PPC::CRRCRegisterClass) {
141 // FIXME: We use R0 here, because it isn't available for RA.
142 // We need to store the CR in the low 4-bits of the saved value. First,
143 // issue a MFCR to save all of the CRBits.
144 NewMIs.push_back(BuildMI(TII.get(PPC::MFCR), PPC::R0));
146 // If the saved register wasn't CR0, shift the bits left so that they are in
148 if (SrcReg != PPC::CR0) {
149 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
150 // rlwinm r0, r0, ShiftBits, 0, 31.
151 NewMIs.push_back(BuildMI(TII.get(PPC::RLWINM), PPC::R0)
152 .addReg(PPC::R0).addImm(ShiftBits).addImm(0).addImm(31));
155 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STW))
156 .addReg(PPC::R0, false, false, true), FrameIdx));
157 } else if (RC == PPC::VRRCRegisterClass) {
158 // We don't have indexed addressing for vector loads. Emit:
162 // FIXME: We use R0 here, because it isn't available for RA.
163 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::ADDI), PPC::R0),
165 NewMIs.push_back(BuildMI(TII.get(PPC::STVX))
166 .addReg(SrcReg, false, false, true).addReg(PPC::R0).addReg(PPC::R0));
168 assert(0 && "Unknown regclass!");
174 PPCRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
175 MachineBasicBlock::iterator MI,
176 unsigned SrcReg, int FrameIdx,
177 const TargetRegisterClass *RC) const {
178 SmallVector<MachineInstr*, 4> NewMIs;
179 StoreRegToStackSlot(TII, SrcReg, FrameIdx, RC, NewMIs);
180 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
181 MBB.insert(MI, NewMIs[i]);
184 void PPCRegisterInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
185 SmallVector<MachineOperand,4> Addr,
186 const TargetRegisterClass *RC,
187 SmallVector<MachineInstr*, 4> &NewMIs) const {
188 if (Addr[0].isFrameIndex()) {
189 StoreRegToStackSlot(TII, SrcReg, Addr[0].getFrameIndex(), RC, NewMIs);
194 if (RC == PPC::GPRCRegisterClass) {
196 } else if (RC == PPC::G8RCRegisterClass) {
198 } else if (RC == PPC::F8RCRegisterClass) {
200 } else if (RC == PPC::F4RCRegisterClass) {
202 } else if (RC == PPC::VRRCRegisterClass) {
205 assert(0 && "Unknown regclass!");
208 MachineInstrBuilder MIB = BuildMI(TII.get(Opc))
209 .addReg(SrcReg, false, false, true);
210 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
211 MachineOperand &MO = Addr[i];
213 MIB.addReg(MO.getReg());
214 else if (MO.isImmediate())
215 MIB.addImm(MO.getImmedValue());
217 MIB.addFrameIndex(MO.getFrameIndex());
219 NewMIs.push_back(MIB);
223 static void LoadRegFromStackSlot(const TargetInstrInfo &TII,
224 unsigned DestReg, int FrameIdx,
225 const TargetRegisterClass *RC,
226 SmallVector<MachineInstr*, 4> &NewMIs) {
227 if (RC == PPC::GPRCRegisterClass) {
228 if (DestReg != PPC::LR) {
229 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), DestReg),
232 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), PPC::R11),
234 NewMIs.push_back(BuildMI(TII.get(PPC::MTLR)).addReg(PPC::R11));
236 } else if (RC == PPC::G8RCRegisterClass) {
237 if (DestReg != PPC::LR8) {
238 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LD), DestReg),
241 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LD), PPC::R11),
243 NewMIs.push_back(BuildMI(TII.get(PPC::MTLR8)).addReg(PPC::R11));
245 } else if (RC == PPC::F8RCRegisterClass) {
246 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LFD), DestReg),
248 } else if (RC == PPC::F4RCRegisterClass) {
249 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LFS), DestReg),
251 } else if (RC == PPC::CRRCRegisterClass) {
252 // FIXME: We use R0 here, because it isn't available for RA.
253 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), PPC::R0),
256 // If the reloaded register isn't CR0, shift the bits right so that they are
257 // in the right CR's slot.
258 if (DestReg != PPC::CR0) {
259 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
260 // rlwinm r11, r11, 32-ShiftBits, 0, 31.
261 NewMIs.push_back(BuildMI(TII.get(PPC::RLWINM), PPC::R0)
262 .addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31));
265 NewMIs.push_back(BuildMI(TII.get(PPC::MTCRF), DestReg).addReg(PPC::R0));
266 } else if (RC == PPC::VRRCRegisterClass) {
267 // We don't have indexed addressing for vector loads. Emit:
271 // FIXME: We use R0 here, because it isn't available for RA.
272 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::ADDI), PPC::R0),
274 NewMIs.push_back(BuildMI(TII.get(PPC::LVX),DestReg).addReg(PPC::R0)
277 assert(0 && "Unknown regclass!");
283 PPCRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
284 MachineBasicBlock::iterator MI,
285 unsigned DestReg, int FrameIdx,
286 const TargetRegisterClass *RC) const {
287 SmallVector<MachineInstr*, 4> NewMIs;
288 LoadRegFromStackSlot(TII, DestReg, FrameIdx, RC, NewMIs);
289 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
290 MBB.insert(MI, NewMIs[i]);
293 void PPCRegisterInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
294 SmallVector<MachineOperand,4> Addr,
295 const TargetRegisterClass *RC,
296 SmallVector<MachineInstr*, 4> &NewMIs) const {
297 if (Addr[0].isFrameIndex()) {
298 LoadRegFromStackSlot(TII, DestReg, Addr[0].getFrameIndex(), RC, NewMIs);
303 if (RC == PPC::GPRCRegisterClass) {
304 assert(DestReg != PPC::LR && "Can't handle this yet!");
306 } else if (RC == PPC::G8RCRegisterClass) {
307 assert(DestReg != PPC::LR8 && "Can't handle this yet!");
309 } else if (RC == PPC::F8RCRegisterClass) {
311 } else if (RC == PPC::F4RCRegisterClass) {
313 } else if (RC == PPC::VRRCRegisterClass) {
316 assert(0 && "Unknown regclass!");
319 MachineInstrBuilder MIB = BuildMI(TII.get(Opc), DestReg);
320 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
321 MachineOperand &MO = Addr[i];
323 MIB.addReg(MO.getReg());
324 else if (MO.isImmediate())
325 MIB.addImm(MO.getImmedValue());
327 MIB.addFrameIndex(MO.getFrameIndex());
329 NewMIs.push_back(MIB);
333 void PPCRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
334 MachineBasicBlock::iterator MI,
335 unsigned DestReg, unsigned SrcReg,
336 const TargetRegisterClass *DestRC,
337 const TargetRegisterClass *SrcRC) const {
338 if (DestRC != SrcRC) {
339 cerr << "Not yet supported!";
343 if (DestRC == PPC::GPRCRegisterClass) {
344 BuildMI(MBB, MI, TII.get(PPC::OR), DestReg).addReg(SrcReg).addReg(SrcReg);
345 } else if (DestRC == PPC::G8RCRegisterClass) {
346 BuildMI(MBB, MI, TII.get(PPC::OR8), DestReg).addReg(SrcReg).addReg(SrcReg);
347 } else if (DestRC == PPC::F4RCRegisterClass) {
348 BuildMI(MBB, MI, TII.get(PPC::FMRS), DestReg).addReg(SrcReg);
349 } else if (DestRC == PPC::F8RCRegisterClass) {
350 BuildMI(MBB, MI, TII.get(PPC::FMRD), DestReg).addReg(SrcReg);
351 } else if (DestRC == PPC::CRRCRegisterClass) {
352 BuildMI(MBB, MI, TII.get(PPC::MCRF), DestReg).addReg(SrcReg);
353 } else if (DestRC == PPC::VRRCRegisterClass) {
354 BuildMI(MBB, MI, TII.get(PPC::VOR), DestReg).addReg(SrcReg).addReg(SrcReg);
356 cerr << "Attempt to copy register that is not GPR or FPR";
361 void PPCRegisterInfo::reMaterialize(MachineBasicBlock &MBB,
362 MachineBasicBlock::iterator I,
364 const MachineInstr *Orig) const {
365 MachineInstr *MI = Orig->clone();
366 MI->getOperand(0).setReg(DestReg);
371 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
372 // 32-bit Darwin calling convention.
373 static const unsigned Macho32_CalleeSavedRegs[] = {
374 PPC::R13, PPC::R14, PPC::R15,
375 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
376 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
377 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
378 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
380 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
381 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
382 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
383 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
386 PPC::CR2, PPC::CR3, PPC::CR4,
387 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
388 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
389 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
394 static const unsigned ELF32_CalleeSavedRegs[] = {
395 PPC::R13, PPC::R14, PPC::R15,
396 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
397 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
398 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
399 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
402 PPC::F10, PPC::F11, PPC::F12, PPC::F13,
403 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
404 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
405 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
406 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
409 PPC::CR2, PPC::CR3, PPC::CR4,
410 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
411 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
412 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
416 // 64-bit Darwin calling convention.
417 static const unsigned Macho64_CalleeSavedRegs[] = {
419 PPC::X16, PPC::X17, PPC::X18, PPC::X19,
420 PPC::X20, PPC::X21, PPC::X22, PPC::X23,
421 PPC::X24, PPC::X25, PPC::X26, PPC::X27,
422 PPC::X28, PPC::X29, PPC::X30, PPC::X31,
424 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
425 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
426 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
427 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
430 PPC::CR2, PPC::CR3, PPC::CR4,
431 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
432 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
433 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
438 if (Subtarget.isMachoABI())
439 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegs :
440 Macho32_CalleeSavedRegs;
443 return ELF32_CalleeSavedRegs;
446 const TargetRegisterClass* const*
447 PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
448 // 32-bit Macho calling convention.
449 static const TargetRegisterClass * const Macho32_CalleeSavedRegClasses[] = {
450 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
451 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
452 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
453 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
454 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
456 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
457 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
458 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
459 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
460 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
462 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
464 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
465 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
466 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
468 &PPC::GPRCRegClass, 0
471 static const TargetRegisterClass * const ELF32_CalleeSavedRegClasses[] = {
472 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
473 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
474 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
475 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
476 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
479 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
480 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
481 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
482 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
483 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
484 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
486 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
488 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
489 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
490 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
492 &PPC::GPRCRegClass, 0
495 // 64-bit Macho calling convention.
496 static const TargetRegisterClass * const Macho64_CalleeSavedRegClasses[] = {
497 &PPC::G8RCRegClass,&PPC::G8RCRegClass,
498 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
499 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
500 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
501 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
503 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
504 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
505 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
506 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
507 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
509 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
511 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
512 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
513 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
515 &PPC::G8RCRegClass, 0
518 if (Subtarget.isMachoABI())
519 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegClasses :
520 Macho32_CalleeSavedRegClasses;
523 return ELF32_CalleeSavedRegClasses;
526 // needsFP - Return true if the specified function should have a dedicated frame
527 // pointer register. This is true if the function has variable sized allocas or
528 // if frame pointer elimination is disabled.
530 static bool needsFP(const MachineFunction &MF) {
531 const MachineFrameInfo *MFI = MF.getFrameInfo();
532 return NoFramePointerElim || MFI->hasVarSizedObjects();
535 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
536 BitVector Reserved(getNumRegs());
537 Reserved.set(PPC::R0);
538 Reserved.set(PPC::R1);
539 Reserved.set(PPC::LR);
540 // In Linux, r2 is reserved for the OS.
541 if (!Subtarget.isDarwin())
542 Reserved.set(PPC::R2);
543 // On PPC64, r13 is the thread pointer. Never allocate this register.
544 // Note that this is overconservative, as it also prevents allocation of
545 // R31 when the FP is not needed.
546 if (Subtarget.isPPC64()) {
547 Reserved.set(PPC::R13);
548 Reserved.set(PPC::R31);
551 Reserved.set(PPC::R31);
555 /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
556 /// copy instructions, turning them into load/store instructions.
557 MachineInstr *PPCRegisterInfo::foldMemoryOperand(MachineInstr *MI,
559 int FrameIndex) const {
560 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
561 // it takes more than one instruction to store it.
562 unsigned Opc = MI->getOpcode();
564 MachineInstr *NewMI = NULL;
565 if ((Opc == PPC::OR &&
566 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
567 if (OpNum == 0) { // move -> store
568 unsigned InReg = MI->getOperand(1).getReg();
569 NewMI = addFrameReference(BuildMI(TII.get(PPC::STW)).addReg(InReg),
571 } else { // move -> load
572 unsigned OutReg = MI->getOperand(0).getReg();
573 NewMI = addFrameReference(BuildMI(TII.get(PPC::LWZ), OutReg),
576 } else if ((Opc == PPC::OR8 &&
577 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
578 if (OpNum == 0) { // move -> store
579 unsigned InReg = MI->getOperand(1).getReg();
580 NewMI = addFrameReference(BuildMI(TII.get(PPC::STD)).addReg(InReg),
582 } else { // move -> load
583 unsigned OutReg = MI->getOperand(0).getReg();
584 NewMI = addFrameReference(BuildMI(TII.get(PPC::LD), OutReg), FrameIndex);
586 } else if (Opc == PPC::FMRD) {
587 if (OpNum == 0) { // move -> store
588 unsigned InReg = MI->getOperand(1).getReg();
589 NewMI = addFrameReference(BuildMI(TII.get(PPC::STFD)).addReg(InReg),
591 } else { // move -> load
592 unsigned OutReg = MI->getOperand(0).getReg();
593 NewMI = addFrameReference(BuildMI(TII.get(PPC::LFD), OutReg), FrameIndex);
595 } else if (Opc == PPC::FMRS) {
596 if (OpNum == 0) { // move -> store
597 unsigned InReg = MI->getOperand(1).getReg();
598 NewMI = addFrameReference(BuildMI(TII.get(PPC::STFS)).addReg(InReg),
600 } else { // move -> load
601 unsigned OutReg = MI->getOperand(0).getReg();
602 NewMI = addFrameReference(BuildMI(TII.get(PPC::LFS), OutReg), FrameIndex);
607 NewMI->copyKillDeadInfo(MI);
611 //===----------------------------------------------------------------------===//
612 // Stack Frame Processing methods
613 //===----------------------------------------------------------------------===//
615 // hasFP - Return true if the specified function actually has a dedicated frame
616 // pointer register. This is true if the function needs a frame pointer and has
617 // a non-zero stack size.
618 bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
619 const MachineFrameInfo *MFI = MF.getFrameInfo();
620 return MFI->getStackSize() && needsFP(MF);
623 /// usesLR - Returns if the link registers (LR) has been used in the function.
625 bool PPCRegisterInfo::usesLR(MachineFunction &MF) const {
626 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
630 void PPCRegisterInfo::
631 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
632 MachineBasicBlock::iterator I) const {
633 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
637 /// LowerDynamicAlloc - Generate the code for allocating an object in the
638 /// current frame. The sequence of code with be in the general form
640 /// addi R0, SP, #frameSize ; get the address of the previous frame
641 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
642 /// addi Rnew, SP, #maxCalFrameSize ; get the top of the allocation
644 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II) const {
645 // Get the instruction.
646 MachineInstr &MI = *II;
647 // Get the instruction's basic block.
648 MachineBasicBlock &MBB = *MI.getParent();
649 // Get the basic block's function.
650 MachineFunction &MF = *MBB.getParent();
651 // Get the frame info.
652 MachineFrameInfo *MFI = MF.getFrameInfo();
653 // Determine whether 64-bit pointers are used.
654 bool LP64 = Subtarget.isPPC64();
656 // Get the maximum call stack size.
657 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
658 // Get the total frame size.
659 unsigned FrameSize = MFI->getStackSize();
661 // Get stack alignments.
662 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
663 unsigned MaxAlign = MFI->getMaxAlignment();
664 assert(MaxAlign <= TargetAlign &&
665 "Dynamic alloca with large aligns not supported");
667 // Determine the previous frame's address. If FrameSize can't be
668 // represented as 16 bits or we need special alignment, then we load the
669 // previous frame's address from 0(SP). Why not do an addis of the hi?
670 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
671 // Constructing the constant and adding would take 3 instructions.
672 // Fortunately, a frame greater than 32K is rare.
673 if (MaxAlign < TargetAlign && isInt16(FrameSize)) {
674 BuildMI(MBB, II, TII.get(PPC::ADDI), PPC::R0)
678 BuildMI(MBB, II, TII.get(PPC::LD), PPC::X0)
682 BuildMI(MBB, II, TII.get(PPC::LWZ), PPC::R0)
687 // Grow the stack and update the stack pointer link, then
688 // determine the address of new allocated space.
690 BuildMI(MBB, II, TII.get(PPC::STDUX))
693 .addReg(MI.getOperand(1).getReg());
694 BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
696 .addImm(maxCallFrameSize);
698 BuildMI(MBB, II, TII.get(PPC::STWUX))
701 .addReg(MI.getOperand(1).getReg());
702 BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
704 .addImm(maxCallFrameSize);
707 // Discard the DYNALLOC instruction.
711 void PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
712 int SPAdj, RegScavenger *RS) const {
713 assert(SPAdj == 0 && "Unexpected");
715 // Get the instruction.
716 MachineInstr &MI = *II;
717 // Get the instruction's basic block.
718 MachineBasicBlock &MBB = *MI.getParent();
719 // Get the basic block's function.
720 MachineFunction &MF = *MBB.getParent();
721 // Get the frame info.
722 MachineFrameInfo *MFI = MF.getFrameInfo();
724 // Find out which operand is the frame index.
726 while (!MI.getOperand(i).isFrameIndex()) {
728 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
730 // Take into account whether it's an add or mem instruction
731 unsigned OffIdx = (i == 2) ? 1 : 2;
732 if (MI.getOpcode() == TargetInstrInfo::INLINEASM)
735 // Get the frame index.
736 int FrameIndex = MI.getOperand(i).getFrameIndex();
738 // Get the frame pointer save index. Users of this index are primarily
739 // DYNALLOC instructions.
740 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
741 int FPSI = FI->getFramePointerSaveIndex();
742 // Get the instruction opcode.
743 unsigned OpC = MI.getOpcode();
745 // Special case for dynamic alloca.
746 if (FPSI && FrameIndex == FPSI &&
747 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
748 lowerDynamicAlloc(II);
752 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
753 MI.getOperand(i).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1, false);
755 // Figure out if the offset in the instruction is shifted right two bits. This
756 // is true for instructions like "STD", which the machine implicitly adds two
758 bool isIXAddr = false;
768 // Now add the frame object offset to the offset from r1.
769 int Offset = MFI->getObjectOffset(FrameIndex);
772 Offset += MI.getOperand(OffIdx).getImmedValue();
774 Offset += MI.getOperand(OffIdx).getImmedValue() << 2;
776 // If we're not using a Frame Pointer that has been set to the value of the
777 // SP before having the stack size subtracted from it, then add the stack size
778 // to Offset to get the correct offset.
779 Offset += MFI->getStackSize();
781 if (!isInt16(Offset)) {
782 // Insert a set of r0 with the full offset value before the ld, st, or add
783 BuildMI(MBB, II, TII.get(PPC::LIS), PPC::R0).addImm(Offset >> 16);
784 BuildMI(MBB, II, TII.get(PPC::ORI), PPC::R0).addReg(PPC::R0).addImm(Offset);
786 // convert into indexed form of the instruction
787 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
788 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
789 assert(ImmToIdxMap.count(OpC) &&
790 "No indexed form of load or store available!");
791 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
792 MI.setInstrDescriptor(TII.get(NewOpcode));
793 MI.getOperand(1).ChangeToRegister(MI.getOperand(i).getReg(), false);
794 MI.getOperand(2).ChangeToRegister(PPC::R0, false);
797 assert((Offset & 3) == 0 && "Invalid frame offset!");
798 Offset >>= 2; // The actual encoded value has the low two bits zero.
800 MI.getOperand(OffIdx).ChangeToImmediate(Offset);
804 /// VRRegNo - Map from a numbered VR register to its enum value.
806 static const unsigned short VRRegNo[] = {
807 PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
808 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15,
809 PPC::V16, PPC::V17, PPC::V18, PPC::V19, PPC::V20, PPC::V21, PPC::V22, PPC::V23,
810 PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
813 /// RemoveVRSaveCode - We have found that this function does not need any code
814 /// to manipulate the VRSAVE register, even though it uses vector registers.
815 /// This can happen when the only registers used are known to be live in or out
816 /// of the function. Remove all of the VRSAVE related code from the function.
817 static void RemoveVRSaveCode(MachineInstr *MI) {
818 MachineBasicBlock *Entry = MI->getParent();
819 MachineFunction *MF = Entry->getParent();
821 // We know that the MTVRSAVE instruction immediately follows MI. Remove it.
822 MachineBasicBlock::iterator MBBI = MI;
824 assert(MBBI != Entry->end() && MBBI->getOpcode() == PPC::MTVRSAVE);
825 MBBI->eraseFromParent();
827 bool RemovedAllMTVRSAVEs = true;
828 // See if we can find and remove the MTVRSAVE instruction from all of the
830 const TargetInstrInfo &TII = *MF->getTarget().getInstrInfo();
831 for (MachineFunction::iterator I = MF->begin(), E = MF->end(); I != E; ++I) {
832 // If last instruction is a return instruction, add an epilogue
833 if (!I->empty() && TII.isReturn(I->back().getOpcode())) {
834 bool FoundIt = false;
835 for (MBBI = I->end(); MBBI != I->begin(); ) {
837 if (MBBI->getOpcode() == PPC::MTVRSAVE) {
838 MBBI->eraseFromParent(); // remove it.
843 RemovedAllMTVRSAVEs &= FoundIt;
847 // If we found and removed all MTVRSAVE instructions, remove the read of
849 if (RemovedAllMTVRSAVEs) {
851 assert(MBBI != Entry->begin() && "UPDATE_VRSAVE is first instr in block?");
853 assert(MBBI->getOpcode() == PPC::MFVRSAVE && "VRSAVE instrs wandered?");
854 MBBI->eraseFromParent();
857 // Finally, nuke the UPDATE_VRSAVE.
858 MI->eraseFromParent();
861 // HandleVRSaveUpdate - MI is the UPDATE_VRSAVE instruction introduced by the
862 // instruction selector. Based on the vector registers that have been used,
863 // transform this into the appropriate ORI instruction.
864 static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
865 MachineFunction *MF = MI->getParent()->getParent();
867 unsigned UsedRegMask = 0;
868 for (unsigned i = 0; i != 32; ++i)
869 if (MF->isPhysRegUsed(VRRegNo[i]))
870 UsedRegMask |= 1 << (31-i);
872 // Live in and live out values already must be in the mask, so don't bother
874 for (MachineFunction::livein_iterator I =
875 MF->livein_begin(), E = MF->livein_end(); I != E; ++I) {
876 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(I->first);
877 if (VRRegNo[RegNo] == I->first) // If this really is a vector reg.
878 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
880 for (MachineFunction::liveout_iterator I =
881 MF->liveout_begin(), E = MF->liveout_end(); I != E; ++I) {
882 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(*I);
883 if (VRRegNo[RegNo] == *I) // If this really is a vector reg.
884 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
887 unsigned SrcReg = MI->getOperand(1).getReg();
888 unsigned DstReg = MI->getOperand(0).getReg();
889 // If no registers are used, turn this into a copy.
890 if (UsedRegMask == 0) {
891 // Remove all VRSAVE code.
892 RemoveVRSaveCode(MI);
894 } else if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
895 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
896 .addReg(SrcReg).addImm(UsedRegMask);
897 } else if ((UsedRegMask & 0xFFFF0000) == UsedRegMask) {
898 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
899 .addReg(SrcReg).addImm(UsedRegMask >> 16);
901 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
902 .addReg(SrcReg).addImm(UsedRegMask >> 16);
903 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
904 .addReg(DstReg).addImm(UsedRegMask & 0xFFFF);
907 // Remove the old UPDATE_VRSAVE instruction.
908 MI->eraseFromParent();
911 /// determineFrameLayout - Determine the size of the frame and maximum call
913 void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
914 MachineFrameInfo *MFI = MF.getFrameInfo();
916 // Get the number of bytes to allocate from the FrameInfo
917 unsigned FrameSize = MFI->getStackSize();
919 // Get the alignments provided by the target, and the maximum alignment
920 // (if any) of the fixed frame objects.
921 unsigned MaxAlign = MFI->getMaxAlignment();
922 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
923 unsigned AlignMask = TargetAlign - 1; //
925 // If we are a leaf function, and use up to 224 bytes of stack space,
926 // don't have a frame pointer, calls, or dynamic alloca then we do not need
927 // to adjust the stack pointer (we fit in the Red Zone).
928 if (FrameSize <= 224 && // Fits in red zone.
929 !MFI->hasVarSizedObjects() && // No dynamic alloca.
930 !MFI->hasCalls() && // No calls.
931 MaxAlign <= TargetAlign) { // No special alignment.
933 MFI->setStackSize(0);
937 // Get the maximum call frame size of all the calls.
938 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
940 // Maximum call frame needs to be at least big enough for linkage and 8 args.
941 unsigned minCallFrameSize =
942 PPCFrameInfo::getMinCallFrameSize(Subtarget.isPPC64(),
943 Subtarget.isMachoABI());
944 maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
946 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
947 // that allocations will be aligned.
948 if (MFI->hasVarSizedObjects())
949 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
951 // Update maximum call frame size.
952 MFI->setMaxCallFrameSize(maxCallFrameSize);
954 // Include call frame size in total.
955 FrameSize += maxCallFrameSize;
957 // Make sure the frame is aligned.
958 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
960 // Update frame info.
961 MFI->setStackSize(FrameSize);
964 void PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
967 // Save and clear the LR state.
968 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
969 unsigned LR = getRARegister();
970 FI->setUsesLR(MF.isPhysRegUsed(LR));
971 MF.setPhysRegUnused(LR);
973 // Save R31 if necessary
974 int FPSI = FI->getFramePointerSaveIndex();
975 bool IsPPC64 = Subtarget.isPPC64();
976 bool IsELF32_ABI = Subtarget.isELF32_ABI();
977 bool IsMachoABI = Subtarget.isMachoABI();
978 const MachineFrameInfo *MFI = MF.getFrameInfo();
980 // If the frame pointer save index hasn't been defined yet.
981 if (!FPSI && (NoFramePointerElim || MFI->hasVarSizedObjects())
983 // Find out what the fix offset of the frame pointer save area.
984 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64,
986 // Allocate the frame index for frame pointer save area.
987 FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
989 FI->setFramePointerSaveIndex(FPSI);
994 void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
995 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
996 MachineBasicBlock::iterator MBBI = MBB.begin();
997 MachineFrameInfo *MFI = MF.getFrameInfo();
998 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
1000 // Prepare for frame info.
1001 unsigned FrameLabelId = 0;
1003 // Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
1005 for (unsigned i = 0; MBBI != MBB.end(); ++i, ++MBBI) {
1006 if (MBBI->getOpcode() == PPC::UPDATE_VRSAVE) {
1007 HandleVRSaveUpdate(MBBI, TII);
1012 // Move MBBI back to the beginning of the function.
1015 // Work out frame sizes.
1016 determineFrameLayout(MF);
1017 unsigned FrameSize = MFI->getStackSize();
1019 int NegFrameSize = -FrameSize;
1021 // Get processor type.
1022 bool IsPPC64 = Subtarget.isPPC64();
1023 // Get operating system
1024 bool IsMachoABI = Subtarget.isMachoABI();
1025 // Check if the link register (LR) has been used.
1026 bool UsesLR = MFI->hasCalls() || usesLR(MF);
1027 // Do we have a frame pointer for this function?
1028 bool HasFP = hasFP(MF) && FrameSize;
1030 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
1031 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
1035 BuildMI(MBB, MBBI, TII.get(PPC::MFLR8), PPC::X0);
1038 BuildMI(MBB, MBBI, TII.get(PPC::STD))
1039 .addReg(PPC::X31).addImm(FPOffset/4).addReg(PPC::X1);
1042 BuildMI(MBB, MBBI, TII.get(PPC::STD))
1043 .addReg(PPC::X0).addImm(LROffset/4).addReg(PPC::X1);
1046 BuildMI(MBB, MBBI, TII.get(PPC::MFLR), PPC::R0);
1049 BuildMI(MBB, MBBI, TII.get(PPC::STW))
1050 .addReg(PPC::R31).addImm(FPOffset).addReg(PPC::R1);
1053 BuildMI(MBB, MBBI, TII.get(PPC::STW))
1054 .addReg(PPC::R0).addImm(LROffset).addReg(PPC::R1);
1057 // Skip if a leaf routine.
1058 if (!FrameSize) return;
1060 // Get stack alignments.
1061 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1062 unsigned MaxAlign = MFI->getMaxAlignment();
1064 if (MMI && MMI->needsFrameInfo()) {
1065 // Mark effective beginning of when frame pointer becomes valid.
1066 FrameLabelId = MMI->NextLabelID();
1067 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(FrameLabelId);
1070 // Adjust stack pointer: r1 += NegFrameSize.
1071 // If there is a preferred stack alignment, align R1 now
1074 if (MaxAlign > TargetAlign) {
1075 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1076 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1077 BuildMI(MBB, MBBI, TII.get(PPC::RLWINM), PPC::R0)
1078 .addReg(PPC::R1).addImm(0).addImm(32-Log2_32(MaxAlign)).addImm(31);
1079 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC) ,PPC::R0).addReg(PPC::R0)
1080 .addImm(NegFrameSize);
1081 BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
1082 .addReg(PPC::R1).addReg(PPC::R1).addReg(PPC::R0);
1083 } else if (isInt16(NegFrameSize)) {
1084 BuildMI(MBB, MBBI, TII.get(PPC::STWU),
1085 PPC::R1).addReg(PPC::R1).addImm(NegFrameSize).addReg(PPC::R1);
1087 BuildMI(MBB, MBBI, TII.get(PPC::LIS), PPC::R0).addImm(NegFrameSize >> 16);
1088 BuildMI(MBB, MBBI, TII.get(PPC::ORI), PPC::R0).addReg(PPC::R0)
1089 .addImm(NegFrameSize & 0xFFFF);
1090 BuildMI(MBB, MBBI, TII.get(PPC::STWUX)).addReg(PPC::R1).addReg(PPC::R1)
1094 if (MaxAlign > TargetAlign) {
1095 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1096 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1097 BuildMI(MBB, MBBI, TII.get(PPC::RLDICL), PPC::X0)
1098 .addReg(PPC::X1).addImm(0).addImm(64-Log2_32(MaxAlign));
1099 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC8), PPC::X0).addReg(PPC::X0)
1100 .addImm(NegFrameSize);
1101 BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
1102 .addReg(PPC::X1).addReg(PPC::X1).addReg(PPC::X0);
1103 } else if (isInt16(NegFrameSize)) {
1104 BuildMI(MBB, MBBI, TII.get(PPC::STDU), PPC::X1)
1105 .addReg(PPC::X1).addImm(NegFrameSize/4).addReg(PPC::X1);
1107 BuildMI(MBB, MBBI, TII.get(PPC::LIS8), PPC::X0).addImm(NegFrameSize >>16);
1108 BuildMI(MBB, MBBI, TII.get(PPC::ORI8), PPC::X0).addReg(PPC::X0)
1109 .addImm(NegFrameSize & 0xFFFF);
1110 BuildMI(MBB, MBBI, TII.get(PPC::STDUX)).addReg(PPC::X1).addReg(PPC::X1)
1115 if (MMI && MMI->needsFrameInfo()) {
1116 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
1119 // Show update of SP.
1120 MachineLocation SPDst(MachineLocation::VirtualFP);
1121 MachineLocation SPSrc(MachineLocation::VirtualFP, NegFrameSize);
1122 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
1124 MachineLocation SP(IsPPC64 ? PPC::X31 : PPC::R31);
1125 Moves.push_back(MachineMove(FrameLabelId, SP, SP));
1129 MachineLocation FPDst(MachineLocation::VirtualFP, FPOffset);
1130 MachineLocation FPSrc(IsPPC64 ? PPC::X31 : PPC::R31);
1131 Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
1134 // Add callee saved registers to move list.
1135 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1136 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
1137 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
1138 unsigned Reg = CSI[I].getReg();
1139 if (Reg == PPC::LR || Reg == PPC::LR8) continue;
1140 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
1141 MachineLocation CSSrc(Reg);
1142 Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
1145 MachineLocation LRDst(MachineLocation::VirtualFP, LROffset);
1146 MachineLocation LRSrc(IsPPC64 ? PPC::LR8 : PPC::LR);
1147 Moves.push_back(MachineMove(FrameLabelId, LRDst, LRSrc));
1149 // Mark effective beginning of when frame pointer is ready.
1150 unsigned ReadyLabelId = MMI->NextLabelID();
1151 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(ReadyLabelId);
1153 MachineLocation FPDst(HasFP ? (IsPPC64 ? PPC::X31 : PPC::R31) :
1154 (IsPPC64 ? PPC::X1 : PPC::R1));
1155 MachineLocation FPSrc(MachineLocation::VirtualFP);
1156 Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
1159 // If there is a frame pointer, copy R1 into R31
1162 BuildMI(MBB, MBBI, TII.get(PPC::OR), PPC::R31).addReg(PPC::R1)
1165 BuildMI(MBB, MBBI, TII.get(PPC::OR8), PPC::X31).addReg(PPC::X1)
1171 void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
1172 MachineBasicBlock &MBB) const {
1173 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1174 assert(MBBI->getOpcode() == PPC::BLR &&
1175 "Can only insert epilog into returning blocks");
1177 // Get alignment info so we know how to restore r1
1178 const MachineFrameInfo *MFI = MF.getFrameInfo();
1179 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1180 unsigned MaxAlign = MFI->getMaxAlignment();
1182 // Get the number of bytes allocated from the FrameInfo.
1183 unsigned FrameSize = MFI->getStackSize();
1185 // Get processor type.
1186 bool IsPPC64 = Subtarget.isPPC64();
1187 // Get operating system
1188 bool IsMachoABI = Subtarget.isMachoABI();
1189 // Check if the link register (LR) has been used.
1190 bool UsesLR = MFI->hasCalls() || usesLR(MF);
1191 // Do we have a frame pointer for this function?
1192 bool HasFP = hasFP(MF) && FrameSize;
1194 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
1195 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
1198 // The loaded (or persistent) stack pointer value is offset by the 'stwu'
1199 // on entry to the function. Add this offset back now.
1200 if (!Subtarget.isPPC64()) {
1201 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1202 !MFI->hasVarSizedObjects()) {
1203 BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
1204 .addReg(PPC::R1).addImm(FrameSize);
1206 BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
1209 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1210 !MFI->hasVarSizedObjects()) {
1211 BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
1212 .addReg(PPC::X1).addImm(FrameSize);
1214 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
1221 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X0)
1222 .addImm(LROffset/4).addReg(PPC::X1);
1225 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X31)
1226 .addImm(FPOffset/4).addReg(PPC::X1);
1229 BuildMI(MBB, MBBI, TII.get(PPC::MTLR8)).addReg(PPC::X0);
1232 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R0)
1233 .addImm(LROffset).addReg(PPC::R1);
1236 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R31)
1237 .addImm(FPOffset).addReg(PPC::R1);
1240 BuildMI(MBB, MBBI, TII.get(PPC::MTLR)).addReg(PPC::R0);
1244 unsigned PPCRegisterInfo::getRARegister() const {
1245 return !Subtarget.isPPC64() ? PPC::LR : PPC::LR8;
1248 unsigned PPCRegisterInfo::getFrameRegister(MachineFunction &MF) const {
1249 if (!Subtarget.isPPC64())
1250 return hasFP(MF) ? PPC::R31 : PPC::R1;
1252 return hasFP(MF) ? PPC::X31 : PPC::X1;
1255 void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
1257 // Initial state of the frame pointer is R1.
1258 MachineLocation Dst(MachineLocation::VirtualFP);
1259 MachineLocation Src(PPC::R1, 0);
1260 Moves.push_back(MachineMove(0, Dst, Src));
1263 unsigned PPCRegisterInfo::getEHExceptionRegister() const {
1264 return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
1267 unsigned PPCRegisterInfo::getEHHandlerRegister() const {
1268 return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;
1271 #include "PPCGenRegisterInfo.inc"