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, bool isKill, int FrameIdx,
108 const TargetRegisterClass *RC,
109 SmallVectorImpl<MachineInstr*> &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, isKill), 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, isKill), 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, isKill), 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, isKill), FrameIdx));
134 } else if (RC == PPC::F8RCRegisterClass) {
135 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STFD))
136 .addReg(SrcReg, false, false, isKill), FrameIdx));
137 } else if (RC == PPC::F4RCRegisterClass) {
138 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STFS))
139 .addReg(SrcReg, false, false, isKill), 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, isKill), 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, isKill).addReg(PPC::R0).addReg(PPC::R0));
168 assert(0 && "Unknown regclass!");
174 PPCRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
175 MachineBasicBlock::iterator MI,
176 unsigned SrcReg, bool isKill, int FrameIdx,
177 const TargetRegisterClass *RC) const {
178 SmallVector<MachineInstr*, 4> NewMIs;
179 StoreRegToStackSlot(TII, SrcReg, isKill, 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,
186 SmallVectorImpl<MachineOperand> &Addr,
187 const TargetRegisterClass *RC,
188 SmallVectorImpl<MachineInstr*> &NewMIs) const {
189 if (Addr[0].isFrameIndex()) {
190 StoreRegToStackSlot(TII, SrcReg, isKill, Addr[0].getFrameIndex(), RC,
196 if (RC == PPC::GPRCRegisterClass) {
198 } else if (RC == PPC::G8RCRegisterClass) {
200 } else if (RC == PPC::F8RCRegisterClass) {
202 } else if (RC == PPC::F4RCRegisterClass) {
204 } else if (RC == PPC::VRRCRegisterClass) {
207 assert(0 && "Unknown regclass!");
210 MachineInstrBuilder MIB = BuildMI(TII.get(Opc))
211 .addReg(SrcReg, false, false, isKill);
212 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
213 MachineOperand &MO = Addr[i];
215 MIB.addReg(MO.getReg());
216 else if (MO.isImmediate())
217 MIB.addImm(MO.getImmedValue());
219 MIB.addFrameIndex(MO.getFrameIndex());
221 NewMIs.push_back(MIB);
225 static void LoadRegFromStackSlot(const TargetInstrInfo &TII,
226 unsigned DestReg, int FrameIdx,
227 const TargetRegisterClass *RC,
228 SmallVectorImpl<MachineInstr*> &NewMIs) {
229 if (RC == PPC::GPRCRegisterClass) {
230 if (DestReg != PPC::LR) {
231 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), DestReg),
234 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), PPC::R11),
236 NewMIs.push_back(BuildMI(TII.get(PPC::MTLR)).addReg(PPC::R11));
238 } else if (RC == PPC::G8RCRegisterClass) {
239 if (DestReg != PPC::LR8) {
240 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LD), DestReg),
243 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LD), PPC::R11),
245 NewMIs.push_back(BuildMI(TII.get(PPC::MTLR8)).addReg(PPC::R11));
247 } else if (RC == PPC::F8RCRegisterClass) {
248 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LFD), DestReg),
250 } else if (RC == PPC::F4RCRegisterClass) {
251 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LFS), DestReg),
253 } else if (RC == PPC::CRRCRegisterClass) {
254 // FIXME: We use R0 here, because it isn't available for RA.
255 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), PPC::R0),
258 // If the reloaded register isn't CR0, shift the bits right so that they are
259 // in the right CR's slot.
260 if (DestReg != PPC::CR0) {
261 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
262 // rlwinm r11, r11, 32-ShiftBits, 0, 31.
263 NewMIs.push_back(BuildMI(TII.get(PPC::RLWINM), PPC::R0)
264 .addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31));
267 NewMIs.push_back(BuildMI(TII.get(PPC::MTCRF), DestReg).addReg(PPC::R0));
268 } else if (RC == PPC::VRRCRegisterClass) {
269 // We don't have indexed addressing for vector loads. Emit:
273 // FIXME: We use R0 here, because it isn't available for RA.
274 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::ADDI), PPC::R0),
276 NewMIs.push_back(BuildMI(TII.get(PPC::LVX),DestReg).addReg(PPC::R0)
279 assert(0 && "Unknown regclass!");
285 PPCRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
286 MachineBasicBlock::iterator MI,
287 unsigned DestReg, int FrameIdx,
288 const TargetRegisterClass *RC) const {
289 SmallVector<MachineInstr*, 4> NewMIs;
290 LoadRegFromStackSlot(TII, DestReg, FrameIdx, RC, NewMIs);
291 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
292 MBB.insert(MI, NewMIs[i]);
295 void PPCRegisterInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
296 SmallVectorImpl<MachineOperand> &Addr,
297 const TargetRegisterClass *RC,
298 SmallVectorImpl<MachineInstr*> &NewMIs) const {
299 if (Addr[0].isFrameIndex()) {
300 LoadRegFromStackSlot(TII, DestReg, Addr[0].getFrameIndex(), RC, NewMIs);
305 if (RC == PPC::GPRCRegisterClass) {
306 assert(DestReg != PPC::LR && "Can't handle this yet!");
308 } else if (RC == PPC::G8RCRegisterClass) {
309 assert(DestReg != PPC::LR8 && "Can't handle this yet!");
311 } else if (RC == PPC::F8RCRegisterClass) {
313 } else if (RC == PPC::F4RCRegisterClass) {
315 } else if (RC == PPC::VRRCRegisterClass) {
318 assert(0 && "Unknown regclass!");
321 MachineInstrBuilder MIB = BuildMI(TII.get(Opc), DestReg);
322 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
323 MachineOperand &MO = Addr[i];
325 MIB.addReg(MO.getReg());
326 else if (MO.isImmediate())
327 MIB.addImm(MO.getImmedValue());
329 MIB.addFrameIndex(MO.getFrameIndex());
331 NewMIs.push_back(MIB);
335 void PPCRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
336 MachineBasicBlock::iterator MI,
337 unsigned DestReg, unsigned SrcReg,
338 const TargetRegisterClass *DestRC,
339 const TargetRegisterClass *SrcRC) const {
340 if (DestRC != SrcRC) {
341 cerr << "Not yet supported!";
345 if (DestRC == PPC::GPRCRegisterClass) {
346 BuildMI(MBB, MI, TII.get(PPC::OR), DestReg).addReg(SrcReg).addReg(SrcReg);
347 } else if (DestRC == PPC::G8RCRegisterClass) {
348 BuildMI(MBB, MI, TII.get(PPC::OR8), DestReg).addReg(SrcReg).addReg(SrcReg);
349 } else if (DestRC == PPC::F4RCRegisterClass) {
350 BuildMI(MBB, MI, TII.get(PPC::FMRS), DestReg).addReg(SrcReg);
351 } else if (DestRC == PPC::F8RCRegisterClass) {
352 BuildMI(MBB, MI, TII.get(PPC::FMRD), DestReg).addReg(SrcReg);
353 } else if (DestRC == PPC::CRRCRegisterClass) {
354 BuildMI(MBB, MI, TII.get(PPC::MCRF), DestReg).addReg(SrcReg);
355 } else if (DestRC == PPC::VRRCRegisterClass) {
356 BuildMI(MBB, MI, TII.get(PPC::VOR), DestReg).addReg(SrcReg).addReg(SrcReg);
358 cerr << "Attempt to copy register that is not GPR or FPR";
363 void PPCRegisterInfo::reMaterialize(MachineBasicBlock &MBB,
364 MachineBasicBlock::iterator I,
366 const MachineInstr *Orig) const {
367 MachineInstr *MI = Orig->clone();
368 MI->getOperand(0).setReg(DestReg);
373 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
374 // 32-bit Darwin calling convention.
375 static const unsigned Macho32_CalleeSavedRegs[] = {
376 PPC::R13, PPC::R14, PPC::R15,
377 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
378 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
379 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
380 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
382 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
383 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
384 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
385 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
388 PPC::CR2, PPC::CR3, PPC::CR4,
389 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
390 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
391 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
396 static const unsigned ELF32_CalleeSavedRegs[] = {
397 PPC::R13, PPC::R14, PPC::R15,
398 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
399 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
400 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
401 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
404 PPC::F10, PPC::F11, PPC::F12, PPC::F13,
405 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
406 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
407 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
408 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
411 PPC::CR2, PPC::CR3, PPC::CR4,
412 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
413 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
414 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
418 // 64-bit Darwin calling convention.
419 static const unsigned Macho64_CalleeSavedRegs[] = {
421 PPC::X16, PPC::X17, PPC::X18, PPC::X19,
422 PPC::X20, PPC::X21, PPC::X22, PPC::X23,
423 PPC::X24, PPC::X25, PPC::X26, PPC::X27,
424 PPC::X28, PPC::X29, PPC::X30, PPC::X31,
426 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
427 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
428 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
429 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
432 PPC::CR2, PPC::CR3, PPC::CR4,
433 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
434 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
435 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
440 if (Subtarget.isMachoABI())
441 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegs :
442 Macho32_CalleeSavedRegs;
445 return ELF32_CalleeSavedRegs;
448 const TargetRegisterClass* const*
449 PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
450 // 32-bit Macho calling convention.
451 static const TargetRegisterClass * const Macho32_CalleeSavedRegClasses[] = {
452 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
453 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
454 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
455 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
456 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
458 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
459 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
460 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
461 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
462 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
464 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
466 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
467 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
468 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
470 &PPC::GPRCRegClass, 0
473 static const TargetRegisterClass * const ELF32_CalleeSavedRegClasses[] = {
474 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
475 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
476 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
477 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
478 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
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,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
485 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
486 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
488 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
490 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
491 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
492 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
494 &PPC::GPRCRegClass, 0
497 // 64-bit Macho calling convention.
498 static const TargetRegisterClass * const Macho64_CalleeSavedRegClasses[] = {
499 &PPC::G8RCRegClass,&PPC::G8RCRegClass,
500 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
501 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
502 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
503 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
505 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
506 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
507 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
508 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
509 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
511 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
513 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
514 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
515 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
517 &PPC::G8RCRegClass, 0
520 if (Subtarget.isMachoABI())
521 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegClasses :
522 Macho32_CalleeSavedRegClasses;
525 return ELF32_CalleeSavedRegClasses;
528 // needsFP - Return true if the specified function should have a dedicated frame
529 // pointer register. This is true if the function has variable sized allocas or
530 // if frame pointer elimination is disabled.
532 static bool needsFP(const MachineFunction &MF) {
533 const MachineFrameInfo *MFI = MF.getFrameInfo();
534 return NoFramePointerElim || MFI->hasVarSizedObjects();
537 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
538 BitVector Reserved(getNumRegs());
539 Reserved.set(PPC::R0);
540 Reserved.set(PPC::R1);
541 Reserved.set(PPC::LR);
542 // In Linux, r2 is reserved for the OS.
543 if (!Subtarget.isDarwin())
544 Reserved.set(PPC::R2);
545 // On PPC64, r13 is the thread pointer. Never allocate this register.
546 // Note that this is overconservative, as it also prevents allocation of
547 // R31 when the FP is not needed.
548 if (Subtarget.isPPC64()) {
549 Reserved.set(PPC::R13);
550 Reserved.set(PPC::R31);
553 Reserved.set(PPC::R31);
557 /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
558 /// copy instructions, turning them into load/store instructions.
559 MachineInstr *PPCRegisterInfo::foldMemoryOperand(MachineInstr *MI,
560 SmallVectorImpl<unsigned> &Ops,
561 int FrameIndex) const {
562 if (Ops.size() != 1) return NULL;
564 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
565 // it takes more than one instruction to store it.
566 unsigned Opc = MI->getOpcode();
567 unsigned OpNum = Ops[0];
569 MachineInstr *NewMI = NULL;
570 if ((Opc == PPC::OR &&
571 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
572 if (OpNum == 0) { // move -> store
573 unsigned InReg = MI->getOperand(1).getReg();
574 NewMI = addFrameReference(BuildMI(TII.get(PPC::STW)).addReg(InReg),
576 } else { // move -> load
577 unsigned OutReg = MI->getOperand(0).getReg();
578 NewMI = addFrameReference(BuildMI(TII.get(PPC::LWZ), OutReg),
581 } else if ((Opc == PPC::OR8 &&
582 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
583 if (OpNum == 0) { // move -> store
584 unsigned InReg = MI->getOperand(1).getReg();
585 NewMI = addFrameReference(BuildMI(TII.get(PPC::STD)).addReg(InReg),
587 } else { // move -> load
588 unsigned OutReg = MI->getOperand(0).getReg();
589 NewMI = addFrameReference(BuildMI(TII.get(PPC::LD), OutReg), FrameIndex);
591 } else if (Opc == PPC::FMRD) {
592 if (OpNum == 0) { // move -> store
593 unsigned InReg = MI->getOperand(1).getReg();
594 NewMI = addFrameReference(BuildMI(TII.get(PPC::STFD)).addReg(InReg),
596 } else { // move -> load
597 unsigned OutReg = MI->getOperand(0).getReg();
598 NewMI = addFrameReference(BuildMI(TII.get(PPC::LFD), OutReg), FrameIndex);
600 } else if (Opc == PPC::FMRS) {
601 if (OpNum == 0) { // move -> store
602 unsigned InReg = MI->getOperand(1).getReg();
603 NewMI = addFrameReference(BuildMI(TII.get(PPC::STFS)).addReg(InReg),
605 } else { // move -> load
606 unsigned OutReg = MI->getOperand(0).getReg();
607 NewMI = addFrameReference(BuildMI(TII.get(PPC::LFS), OutReg), FrameIndex);
612 NewMI->copyKillDeadInfo(MI);
616 bool PPCRegisterInfo::canFoldMemoryOperand(MachineInstr *MI,
617 SmallVectorImpl<unsigned> &Ops) const {
618 if (Ops.size() != 1) return false;
620 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
621 // it takes more than one instruction to store it.
622 unsigned Opc = MI->getOpcode();
624 if ((Opc == PPC::OR &&
625 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
627 else if ((Opc == PPC::OR8 &&
628 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
630 else if (Opc == PPC::FMRD || Opc == PPC::FMRS)
636 //===----------------------------------------------------------------------===//
637 // Stack Frame Processing methods
638 //===----------------------------------------------------------------------===//
640 // hasFP - Return true if the specified function actually has a dedicated frame
641 // pointer register. This is true if the function needs a frame pointer and has
642 // a non-zero stack size.
643 bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
644 const MachineFrameInfo *MFI = MF.getFrameInfo();
645 return MFI->getStackSize() && needsFP(MF);
648 /// usesLR - Returns if the link registers (LR) has been used in the function.
650 bool PPCRegisterInfo::usesLR(MachineFunction &MF) const {
651 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
655 void PPCRegisterInfo::
656 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
657 MachineBasicBlock::iterator I) const {
658 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
662 /// LowerDynamicAlloc - Generate the code for allocating an object in the
663 /// current frame. The sequence of code with be in the general form
665 /// addi R0, SP, #frameSize ; get the address of the previous frame
666 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
667 /// addi Rnew, SP, #maxCalFrameSize ; get the top of the allocation
669 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II) const {
670 // Get the instruction.
671 MachineInstr &MI = *II;
672 // Get the instruction's basic block.
673 MachineBasicBlock &MBB = *MI.getParent();
674 // Get the basic block's function.
675 MachineFunction &MF = *MBB.getParent();
676 // Get the frame info.
677 MachineFrameInfo *MFI = MF.getFrameInfo();
678 // Determine whether 64-bit pointers are used.
679 bool LP64 = Subtarget.isPPC64();
681 // Get the maximum call stack size.
682 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
683 // Get the total frame size.
684 unsigned FrameSize = MFI->getStackSize();
686 // Get stack alignments.
687 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
688 unsigned MaxAlign = MFI->getMaxAlignment();
689 assert(MaxAlign <= TargetAlign &&
690 "Dynamic alloca with large aligns not supported");
692 // Determine the previous frame's address. If FrameSize can't be
693 // represented as 16 bits or we need special alignment, then we load the
694 // previous frame's address from 0(SP). Why not do an addis of the hi?
695 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
696 // Constructing the constant and adding would take 3 instructions.
697 // Fortunately, a frame greater than 32K is rare.
698 if (MaxAlign < TargetAlign && isInt16(FrameSize)) {
699 BuildMI(MBB, II, TII.get(PPC::ADDI), PPC::R0)
703 BuildMI(MBB, II, TII.get(PPC::LD), PPC::X0)
707 BuildMI(MBB, II, TII.get(PPC::LWZ), PPC::R0)
712 // Grow the stack and update the stack pointer link, then
713 // determine the address of new allocated space.
715 BuildMI(MBB, II, TII.get(PPC::STDUX))
718 .addReg(MI.getOperand(1).getReg());
719 BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
721 .addImm(maxCallFrameSize);
723 BuildMI(MBB, II, TII.get(PPC::STWUX))
726 .addReg(MI.getOperand(1).getReg());
727 BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
729 .addImm(maxCallFrameSize);
732 // Discard the DYNALLOC instruction.
736 void PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
737 int SPAdj, RegScavenger *RS) const {
738 assert(SPAdj == 0 && "Unexpected");
740 // Get the instruction.
741 MachineInstr &MI = *II;
742 // Get the instruction's basic block.
743 MachineBasicBlock &MBB = *MI.getParent();
744 // Get the basic block's function.
745 MachineFunction &MF = *MBB.getParent();
746 // Get the frame info.
747 MachineFrameInfo *MFI = MF.getFrameInfo();
749 // Find out which operand is the frame index.
750 unsigned FIOperandNo = 0;
751 while (!MI.getOperand(FIOperandNo).isFrameIndex()) {
753 assert(FIOperandNo != MI.getNumOperands() &&
754 "Instr doesn't have FrameIndex operand!");
756 // Take into account whether it's an add or mem instruction
757 unsigned OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
758 if (MI.getOpcode() == TargetInstrInfo::INLINEASM)
759 OffsetOperandNo = FIOperandNo-1;
761 // Get the frame index.
762 int FrameIndex = MI.getOperand(FIOperandNo).getFrameIndex();
764 // Get the frame pointer save index. Users of this index are primarily
765 // DYNALLOC instructions.
766 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
767 int FPSI = FI->getFramePointerSaveIndex();
768 // Get the instruction opcode.
769 unsigned OpC = MI.getOpcode();
771 // Special case for dynamic alloca.
772 if (FPSI && FrameIndex == FPSI &&
773 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
774 lowerDynamicAlloc(II);
778 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
779 MI.getOperand(FIOperandNo).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1,
782 // Figure out if the offset in the instruction is shifted right two bits. This
783 // is true for instructions like "STD", which the machine implicitly adds two
785 bool isIXAddr = false;
795 // Now add the frame object offset to the offset from r1.
796 int Offset = MFI->getObjectOffset(FrameIndex);
798 Offset += MI.getOperand(OffsetOperandNo).getImmedValue();
800 Offset += MI.getOperand(OffsetOperandNo).getImmedValue() << 2;
802 // If we're not using a Frame Pointer that has been set to the value of the
803 // SP before having the stack size subtracted from it, then add the stack size
804 // to Offset to get the correct offset.
805 Offset += MFI->getStackSize();
807 // If we can, encode the offset directly into the instruction. If this is a
808 // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If
809 // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits
810 // clear can be encoded. This is extremely uncommon, because normally you
811 // only "std" to a stack slot that is at least 4-byte aligned, but it can
812 // happen in invalid code.
813 if (isInt16(Offset) && (!isIXAddr || (isIXAddr & 3) == 0)) {
815 Offset >>= 2; // The actual encoded value has the low two bits zero.
816 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
820 // Insert a set of r0 with the full offset value before the ld, st, or add
821 BuildMI(MBB, II, TII.get(PPC::LIS), PPC::R0).addImm(Offset >> 16);
822 BuildMI(MBB, II, TII.get(PPC::ORI), PPC::R0).addReg(PPC::R0).addImm(Offset);
824 // Convert into indexed form of the instruction
825 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
826 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
827 unsigned OperandBase;
828 if (OpC != TargetInstrInfo::INLINEASM) {
829 assert(ImmToIdxMap.count(OpC) &&
830 "No indexed form of load or store available!");
831 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
832 MI.setInstrDescriptor(TII.get(NewOpcode));
835 OperandBase = OffsetOperandNo;
838 unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
839 MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
840 MI.getOperand(OperandBase+1).ChangeToRegister(PPC::R0, false);
843 /// VRRegNo - Map from a numbered VR register to its enum value.
845 static const unsigned short VRRegNo[] = {
846 PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
847 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15,
848 PPC::V16, PPC::V17, PPC::V18, PPC::V19, PPC::V20, PPC::V21, PPC::V22, PPC::V23,
849 PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
852 /// RemoveVRSaveCode - We have found that this function does not need any code
853 /// to manipulate the VRSAVE register, even though it uses vector registers.
854 /// This can happen when the only registers used are known to be live in or out
855 /// of the function. Remove all of the VRSAVE related code from the function.
856 static void RemoveVRSaveCode(MachineInstr *MI) {
857 MachineBasicBlock *Entry = MI->getParent();
858 MachineFunction *MF = Entry->getParent();
860 // We know that the MTVRSAVE instruction immediately follows MI. Remove it.
861 MachineBasicBlock::iterator MBBI = MI;
863 assert(MBBI != Entry->end() && MBBI->getOpcode() == PPC::MTVRSAVE);
864 MBBI->eraseFromParent();
866 bool RemovedAllMTVRSAVEs = true;
867 // See if we can find and remove the MTVRSAVE instruction from all of the
869 const TargetInstrInfo &TII = *MF->getTarget().getInstrInfo();
870 for (MachineFunction::iterator I = MF->begin(), E = MF->end(); I != E; ++I) {
871 // If last instruction is a return instruction, add an epilogue
872 if (!I->empty() && TII.isReturn(I->back().getOpcode())) {
873 bool FoundIt = false;
874 for (MBBI = I->end(); MBBI != I->begin(); ) {
876 if (MBBI->getOpcode() == PPC::MTVRSAVE) {
877 MBBI->eraseFromParent(); // remove it.
882 RemovedAllMTVRSAVEs &= FoundIt;
886 // If we found and removed all MTVRSAVE instructions, remove the read of
888 if (RemovedAllMTVRSAVEs) {
890 assert(MBBI != Entry->begin() && "UPDATE_VRSAVE is first instr in block?");
892 assert(MBBI->getOpcode() == PPC::MFVRSAVE && "VRSAVE instrs wandered?");
893 MBBI->eraseFromParent();
896 // Finally, nuke the UPDATE_VRSAVE.
897 MI->eraseFromParent();
900 // HandleVRSaveUpdate - MI is the UPDATE_VRSAVE instruction introduced by the
901 // instruction selector. Based on the vector registers that have been used,
902 // transform this into the appropriate ORI instruction.
903 static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
904 MachineFunction *MF = MI->getParent()->getParent();
906 unsigned UsedRegMask = 0;
907 for (unsigned i = 0; i != 32; ++i)
908 if (MF->isPhysRegUsed(VRRegNo[i]))
909 UsedRegMask |= 1 << (31-i);
911 // Live in and live out values already must be in the mask, so don't bother
913 for (MachineFunction::livein_iterator I =
914 MF->livein_begin(), E = MF->livein_end(); I != E; ++I) {
915 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(I->first);
916 if (VRRegNo[RegNo] == I->first) // If this really is a vector reg.
917 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
919 for (MachineFunction::liveout_iterator I =
920 MF->liveout_begin(), E = MF->liveout_end(); I != E; ++I) {
921 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(*I);
922 if (VRRegNo[RegNo] == *I) // If this really is a vector reg.
923 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
926 unsigned SrcReg = MI->getOperand(1).getReg();
927 unsigned DstReg = MI->getOperand(0).getReg();
928 // If no registers are used, turn this into a copy.
929 if (UsedRegMask == 0) {
930 // Remove all VRSAVE code.
931 RemoveVRSaveCode(MI);
933 } else if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
934 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
935 .addReg(SrcReg).addImm(UsedRegMask);
936 } else if ((UsedRegMask & 0xFFFF0000) == UsedRegMask) {
937 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
938 .addReg(SrcReg).addImm(UsedRegMask >> 16);
940 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
941 .addReg(SrcReg).addImm(UsedRegMask >> 16);
942 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
943 .addReg(DstReg).addImm(UsedRegMask & 0xFFFF);
946 // Remove the old UPDATE_VRSAVE instruction.
947 MI->eraseFromParent();
950 /// determineFrameLayout - Determine the size of the frame and maximum call
952 void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
953 MachineFrameInfo *MFI = MF.getFrameInfo();
955 // Get the number of bytes to allocate from the FrameInfo
956 unsigned FrameSize = MFI->getStackSize();
958 // Get the alignments provided by the target, and the maximum alignment
959 // (if any) of the fixed frame objects.
960 unsigned MaxAlign = MFI->getMaxAlignment();
961 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
962 unsigned AlignMask = TargetAlign - 1; //
964 // If we are a leaf function, and use up to 224 bytes of stack space,
965 // don't have a frame pointer, calls, or dynamic alloca then we do not need
966 // to adjust the stack pointer (we fit in the Red Zone).
967 if (FrameSize <= 224 && // Fits in red zone.
968 !MFI->hasVarSizedObjects() && // No dynamic alloca.
969 !MFI->hasCalls() && // No calls.
970 MaxAlign <= TargetAlign) { // No special alignment.
972 MFI->setStackSize(0);
976 // Get the maximum call frame size of all the calls.
977 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
979 // Maximum call frame needs to be at least big enough for linkage and 8 args.
980 unsigned minCallFrameSize =
981 PPCFrameInfo::getMinCallFrameSize(Subtarget.isPPC64(),
982 Subtarget.isMachoABI());
983 maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
985 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
986 // that allocations will be aligned.
987 if (MFI->hasVarSizedObjects())
988 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
990 // Update maximum call frame size.
991 MFI->setMaxCallFrameSize(maxCallFrameSize);
993 // Include call frame size in total.
994 FrameSize += maxCallFrameSize;
996 // Make sure the frame is aligned.
997 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
999 // Update frame info.
1000 MFI->setStackSize(FrameSize);
1003 void PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
1006 // Save and clear the LR state.
1007 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1008 unsigned LR = getRARegister();
1009 FI->setUsesLR(MF.isPhysRegUsed(LR));
1010 MF.setPhysRegUnused(LR);
1012 // Save R31 if necessary
1013 int FPSI = FI->getFramePointerSaveIndex();
1014 bool IsPPC64 = Subtarget.isPPC64();
1015 bool IsELF32_ABI = Subtarget.isELF32_ABI();
1016 bool IsMachoABI = Subtarget.isMachoABI();
1017 const MachineFrameInfo *MFI = MF.getFrameInfo();
1019 // If the frame pointer save index hasn't been defined yet.
1020 if (!FPSI && (NoFramePointerElim || MFI->hasVarSizedObjects())
1022 // Find out what the fix offset of the frame pointer save area.
1023 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64,
1025 // Allocate the frame index for frame pointer save area.
1026 FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
1028 FI->setFramePointerSaveIndex(FPSI);
1033 void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
1034 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
1035 MachineBasicBlock::iterator MBBI = MBB.begin();
1036 MachineFrameInfo *MFI = MF.getFrameInfo();
1037 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
1039 // Prepare for frame info.
1040 unsigned FrameLabelId = 0;
1042 // Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
1044 for (unsigned i = 0; MBBI != MBB.end(); ++i, ++MBBI) {
1045 if (MBBI->getOpcode() == PPC::UPDATE_VRSAVE) {
1046 HandleVRSaveUpdate(MBBI, TII);
1051 // Move MBBI back to the beginning of the function.
1054 // Work out frame sizes.
1055 determineFrameLayout(MF);
1056 unsigned FrameSize = MFI->getStackSize();
1058 int NegFrameSize = -FrameSize;
1060 // Get processor type.
1061 bool IsPPC64 = Subtarget.isPPC64();
1062 // Get operating system
1063 bool IsMachoABI = Subtarget.isMachoABI();
1064 // Check if the link register (LR) has been used.
1065 bool UsesLR = MFI->hasCalls() || usesLR(MF);
1066 // Do we have a frame pointer for this function?
1067 bool HasFP = hasFP(MF) && FrameSize;
1069 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
1070 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
1074 BuildMI(MBB, MBBI, TII.get(PPC::MFLR8), PPC::X0);
1077 BuildMI(MBB, MBBI, TII.get(PPC::STD))
1078 .addReg(PPC::X31).addImm(FPOffset/4).addReg(PPC::X1);
1081 BuildMI(MBB, MBBI, TII.get(PPC::STD))
1082 .addReg(PPC::X0).addImm(LROffset/4).addReg(PPC::X1);
1085 BuildMI(MBB, MBBI, TII.get(PPC::MFLR), PPC::R0);
1088 BuildMI(MBB, MBBI, TII.get(PPC::STW))
1089 .addReg(PPC::R31).addImm(FPOffset).addReg(PPC::R1);
1092 BuildMI(MBB, MBBI, TII.get(PPC::STW))
1093 .addReg(PPC::R0).addImm(LROffset).addReg(PPC::R1);
1096 // Skip if a leaf routine.
1097 if (!FrameSize) return;
1099 // Get stack alignments.
1100 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1101 unsigned MaxAlign = MFI->getMaxAlignment();
1103 if (MMI && MMI->needsFrameInfo()) {
1104 // Mark effective beginning of when frame pointer becomes valid.
1105 FrameLabelId = MMI->NextLabelID();
1106 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(FrameLabelId);
1109 // Adjust stack pointer: r1 += NegFrameSize.
1110 // If there is a preferred stack alignment, align R1 now
1113 if (MaxAlign > TargetAlign) {
1114 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1115 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1116 BuildMI(MBB, MBBI, TII.get(PPC::RLWINM), PPC::R0)
1117 .addReg(PPC::R1).addImm(0).addImm(32-Log2_32(MaxAlign)).addImm(31);
1118 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC) ,PPC::R0).addReg(PPC::R0)
1119 .addImm(NegFrameSize);
1120 BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
1121 .addReg(PPC::R1).addReg(PPC::R1).addReg(PPC::R0);
1122 } else if (isInt16(NegFrameSize)) {
1123 BuildMI(MBB, MBBI, TII.get(PPC::STWU),
1124 PPC::R1).addReg(PPC::R1).addImm(NegFrameSize).addReg(PPC::R1);
1126 BuildMI(MBB, MBBI, TII.get(PPC::LIS), PPC::R0).addImm(NegFrameSize >> 16);
1127 BuildMI(MBB, MBBI, TII.get(PPC::ORI), PPC::R0).addReg(PPC::R0)
1128 .addImm(NegFrameSize & 0xFFFF);
1129 BuildMI(MBB, MBBI, TII.get(PPC::STWUX)).addReg(PPC::R1).addReg(PPC::R1)
1133 if (MaxAlign > TargetAlign) {
1134 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1135 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1136 BuildMI(MBB, MBBI, TII.get(PPC::RLDICL), PPC::X0)
1137 .addReg(PPC::X1).addImm(0).addImm(64-Log2_32(MaxAlign));
1138 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC8), PPC::X0).addReg(PPC::X0)
1139 .addImm(NegFrameSize);
1140 BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
1141 .addReg(PPC::X1).addReg(PPC::X1).addReg(PPC::X0);
1142 } else if (isInt16(NegFrameSize)) {
1143 BuildMI(MBB, MBBI, TII.get(PPC::STDU), PPC::X1)
1144 .addReg(PPC::X1).addImm(NegFrameSize/4).addReg(PPC::X1);
1146 BuildMI(MBB, MBBI, TII.get(PPC::LIS8), PPC::X0).addImm(NegFrameSize >>16);
1147 BuildMI(MBB, MBBI, TII.get(PPC::ORI8), PPC::X0).addReg(PPC::X0)
1148 .addImm(NegFrameSize & 0xFFFF);
1149 BuildMI(MBB, MBBI, TII.get(PPC::STDUX)).addReg(PPC::X1).addReg(PPC::X1)
1154 if (MMI && MMI->needsFrameInfo()) {
1155 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
1158 // Show update of SP.
1159 MachineLocation SPDst(MachineLocation::VirtualFP);
1160 MachineLocation SPSrc(MachineLocation::VirtualFP, NegFrameSize);
1161 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
1163 MachineLocation SP(IsPPC64 ? PPC::X31 : PPC::R31);
1164 Moves.push_back(MachineMove(FrameLabelId, SP, SP));
1168 MachineLocation FPDst(MachineLocation::VirtualFP, FPOffset);
1169 MachineLocation FPSrc(IsPPC64 ? PPC::X31 : PPC::R31);
1170 Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
1173 // Add callee saved registers to move list.
1174 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1175 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
1176 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
1177 unsigned Reg = CSI[I].getReg();
1178 if (Reg == PPC::LR || Reg == PPC::LR8) continue;
1179 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
1180 MachineLocation CSSrc(Reg);
1181 Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
1184 MachineLocation LRDst(MachineLocation::VirtualFP, LROffset);
1185 MachineLocation LRSrc(IsPPC64 ? PPC::LR8 : PPC::LR);
1186 Moves.push_back(MachineMove(FrameLabelId, LRDst, LRSrc));
1188 // Mark effective beginning of when frame pointer is ready.
1189 unsigned ReadyLabelId = MMI->NextLabelID();
1190 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(ReadyLabelId);
1192 MachineLocation FPDst(HasFP ? (IsPPC64 ? PPC::X31 : PPC::R31) :
1193 (IsPPC64 ? PPC::X1 : PPC::R1));
1194 MachineLocation FPSrc(MachineLocation::VirtualFP);
1195 Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
1198 // If there is a frame pointer, copy R1 into R31
1201 BuildMI(MBB, MBBI, TII.get(PPC::OR), PPC::R31).addReg(PPC::R1)
1204 BuildMI(MBB, MBBI, TII.get(PPC::OR8), PPC::X31).addReg(PPC::X1)
1210 void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
1211 MachineBasicBlock &MBB) const {
1212 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1213 assert(MBBI->getOpcode() == PPC::BLR &&
1214 "Can only insert epilog into returning blocks");
1216 // Get alignment info so we know how to restore r1
1217 const MachineFrameInfo *MFI = MF.getFrameInfo();
1218 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1219 unsigned MaxAlign = MFI->getMaxAlignment();
1221 // Get the number of bytes allocated from the FrameInfo.
1222 unsigned FrameSize = MFI->getStackSize();
1224 // Get processor type.
1225 bool IsPPC64 = Subtarget.isPPC64();
1226 // Get operating system
1227 bool IsMachoABI = Subtarget.isMachoABI();
1228 // Check if the link register (LR) has been used.
1229 bool UsesLR = MFI->hasCalls() || usesLR(MF);
1230 // Do we have a frame pointer for this function?
1231 bool HasFP = hasFP(MF) && FrameSize;
1233 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
1234 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
1237 // The loaded (or persistent) stack pointer value is offset by the 'stwu'
1238 // on entry to the function. Add this offset back now.
1239 if (!Subtarget.isPPC64()) {
1240 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1241 !MFI->hasVarSizedObjects()) {
1242 BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
1243 .addReg(PPC::R1).addImm(FrameSize);
1245 BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
1248 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1249 !MFI->hasVarSizedObjects()) {
1250 BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
1251 .addReg(PPC::X1).addImm(FrameSize);
1253 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
1260 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X0)
1261 .addImm(LROffset/4).addReg(PPC::X1);
1264 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X31)
1265 .addImm(FPOffset/4).addReg(PPC::X1);
1268 BuildMI(MBB, MBBI, TII.get(PPC::MTLR8)).addReg(PPC::X0);
1271 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R0)
1272 .addImm(LROffset).addReg(PPC::R1);
1275 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R31)
1276 .addImm(FPOffset).addReg(PPC::R1);
1279 BuildMI(MBB, MBBI, TII.get(PPC::MTLR)).addReg(PPC::R0);
1283 unsigned PPCRegisterInfo::getRARegister() const {
1284 return !Subtarget.isPPC64() ? PPC::LR : PPC::LR8;
1287 unsigned PPCRegisterInfo::getFrameRegister(MachineFunction &MF) const {
1288 if (!Subtarget.isPPC64())
1289 return hasFP(MF) ? PPC::R31 : PPC::R1;
1291 return hasFP(MF) ? PPC::X31 : PPC::X1;
1294 void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
1296 // Initial state of the frame pointer is R1.
1297 MachineLocation Dst(MachineLocation::VirtualFP);
1298 MachineLocation Src(PPC::R1, 0);
1299 Moves.push_back(MachineMove(0, Dst, Src));
1302 unsigned PPCRegisterInfo::getEHExceptionRegister() const {
1303 return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
1306 unsigned PPCRegisterInfo::getEHHandlerRegister() const {
1307 return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;
1310 int PPCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
1311 // FIXME: Most probably dwarf numbers differs for Linux and Darwin
1312 return PPCGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
1315 #include "PPCGenRegisterInfo.inc"