1 //===- PPCRegisterInfo.cpp - PowerPC Register Information -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the PowerPC implementation of the TargetRegisterInfo
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "reginfo"
17 #include "PPCInstrBuilder.h"
18 #include "PPCMachineFunctionInfo.h"
19 #include "PPCRegisterInfo.h"
20 #include "PPCFrameInfo.h"
21 #include "PPCSubtarget.h"
22 #include "llvm/Constants.h"
23 #include "llvm/Type.h"
24 #include "llvm/CodeGen/ValueTypes.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineModuleInfo.h"
27 #include "llvm/CodeGen/MachineFunction.h"
28 #include "llvm/CodeGen/MachineFrameInfo.h"
29 #include "llvm/CodeGen/MachineLocation.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/CodeGen/RegisterScavenging.h"
32 #include "llvm/CodeGen/SelectionDAGNodes.h"
33 #include "llvm/Target/TargetFrameInfo.h"
34 #include "llvm/Target/TargetInstrInfo.h"
35 #include "llvm/Target/TargetMachine.h"
36 #include "llvm/Target/TargetOptions.h"
37 #include "llvm/Support/CommandLine.h"
38 #include "llvm/Support/Debug.h"
39 #include "llvm/Support/MathExtras.h"
40 #include "llvm/ADT/BitVector.h"
41 #include "llvm/ADT/STLExtras.h"
45 // FIXME (64-bit): Eventually enable by default.
46 cl::opt<bool> EnablePPCRS("enable-ppc-regscavenger",
48 cl::desc("enable PPC register scavenger"),
51 // FIXME (64-bit): Should be inlined.
53 PPCRegisterInfo::requiresRegisterScavenging(const MachineFunction &) const {
57 /// getRegisterNumbering - Given the enum value for some register, e.g.
58 /// PPC::F14, return the number that it corresponds to (e.g. 14).
59 unsigned PPCRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
63 case R0 : case X0 : case F0 : case V0 : case CR0: return 0;
64 case R1 : case X1 : case F1 : case V1 : case CR1: return 1;
65 case R2 : case X2 : case F2 : case V2 : case CR2: return 2;
66 case R3 : case X3 : case F3 : case V3 : case CR3: return 3;
67 case R4 : case X4 : case F4 : case V4 : case CR4: return 4;
68 case R5 : case X5 : case F5 : case V5 : case CR5: return 5;
69 case R6 : case X6 : case F6 : case V6 : case CR6: return 6;
70 case R7 : case X7 : case F7 : case V7 : case CR7: return 7;
71 case R8 : case X8 : case F8 : case V8 : return 8;
72 case R9 : case X9 : case F9 : case V9 : return 9;
73 case R10: case X10: case F10: case V10: return 10;
74 case R11: case X11: case F11: case V11: return 11;
75 case R12: case X12: case F12: case V12: return 12;
76 case R13: case X13: case F13: case V13: return 13;
77 case R14: case X14: case F14: case V14: return 14;
78 case R15: case X15: case F15: case V15: return 15;
79 case R16: case X16: case F16: case V16: return 16;
80 case R17: case X17: case F17: case V17: return 17;
81 case R18: case X18: case F18: case V18: return 18;
82 case R19: case X19: case F19: case V19: return 19;
83 case R20: case X20: case F20: case V20: return 20;
84 case R21: case X21: case F21: case V21: return 21;
85 case R22: case X22: case F22: case V22: return 22;
86 case R23: case X23: case F23: case V23: return 23;
87 case R24: case X24: case F24: case V24: return 24;
88 case R25: case X25: case F25: case V25: return 25;
89 case R26: case X26: case F26: case V26: return 26;
90 case R27: case X27: case F27: case V27: return 27;
91 case R28: case X28: case F28: case V28: return 28;
92 case R29: case X29: case F29: case V29: return 29;
93 case R30: case X30: case F30: case V30: return 30;
94 case R31: case X31: case F31: case V31: return 31;
96 cerr << "Unhandled reg in PPCRegisterInfo::getRegisterNumbering!\n";
101 PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
102 const TargetInstrInfo &tii)
103 : PPCGenRegisterInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
104 Subtarget(ST), TII(tii) {
105 ImmToIdxMap[PPC::LD] = PPC::LDX; ImmToIdxMap[PPC::STD] = PPC::STDX;
106 ImmToIdxMap[PPC::LBZ] = PPC::LBZX; ImmToIdxMap[PPC::STB] = PPC::STBX;
107 ImmToIdxMap[PPC::LHZ] = PPC::LHZX; ImmToIdxMap[PPC::LHA] = PPC::LHAX;
108 ImmToIdxMap[PPC::LWZ] = PPC::LWZX; ImmToIdxMap[PPC::LWA] = PPC::LWAX;
109 ImmToIdxMap[PPC::LFS] = PPC::LFSX; ImmToIdxMap[PPC::LFD] = PPC::LFDX;
110 ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX;
111 ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX;
112 ImmToIdxMap[PPC::ADDI] = PPC::ADD4;
115 ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8;
116 ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8;
117 ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8;
118 ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX;
119 ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
122 void PPCRegisterInfo::reMaterialize(MachineBasicBlock &MBB,
123 MachineBasicBlock::iterator I,
125 const MachineInstr *Orig) const {
126 MachineInstr *MI = Orig->clone();
127 MI->getOperand(0).setReg(DestReg);
132 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
133 // 32-bit Darwin calling convention.
134 static const unsigned Macho32_CalleeSavedRegs[] = {
135 PPC::R13, PPC::R14, PPC::R15,
136 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
137 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
138 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
139 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
141 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
142 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
143 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
144 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
147 PPC::CR2, PPC::CR3, PPC::CR4,
148 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
149 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
150 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
155 static const unsigned ELF32_CalleeSavedRegs[] = {
156 PPC::R13, PPC::R14, PPC::R15,
157 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
158 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
159 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
160 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
163 PPC::F10, PPC::F11, PPC::F12, PPC::F13,
164 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
165 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
166 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
167 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
170 PPC::CR2, PPC::CR3, PPC::CR4,
171 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
172 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
173 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
177 // 64-bit Darwin calling convention.
178 static const unsigned Macho64_CalleeSavedRegs[] = {
180 PPC::X16, PPC::X17, PPC::X18, PPC::X19,
181 PPC::X20, PPC::X21, PPC::X22, PPC::X23,
182 PPC::X24, PPC::X25, PPC::X26, PPC::X27,
183 PPC::X28, PPC::X29, PPC::X30, PPC::X31,
185 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
186 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
187 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
188 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
191 PPC::CR2, PPC::CR3, PPC::CR4,
192 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
193 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
194 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
199 if (Subtarget.isMachoABI())
200 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegs :
201 Macho32_CalleeSavedRegs;
204 return ELF32_CalleeSavedRegs;
207 const TargetRegisterClass* const*
208 PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
209 // 32-bit Macho calling convention.
210 static const TargetRegisterClass * const Macho32_CalleeSavedRegClasses[] = {
211 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
212 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
213 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
214 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
215 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
217 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
218 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
219 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
220 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
221 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
223 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
225 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
226 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
227 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
229 &PPC::GPRCRegClass, 0
232 static const TargetRegisterClass * const ELF32_CalleeSavedRegClasses[] = {
233 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
234 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
235 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
236 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
237 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
240 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
241 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
242 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
243 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
244 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
245 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
247 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
249 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
250 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
251 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
253 &PPC::GPRCRegClass, 0
256 // 64-bit Macho calling convention.
257 static const TargetRegisterClass * const Macho64_CalleeSavedRegClasses[] = {
258 &PPC::G8RCRegClass,&PPC::G8RCRegClass,
259 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
260 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
261 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
262 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
264 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
265 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
266 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
267 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
268 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
270 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
272 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
273 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
274 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
276 &PPC::G8RCRegClass, 0
279 if (Subtarget.isMachoABI())
280 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegClasses :
281 Macho32_CalleeSavedRegClasses;
284 return ELF32_CalleeSavedRegClasses;
287 // needsFP - Return true if the specified function should have a dedicated frame
288 // pointer register. This is true if the function has variable sized allocas or
289 // if frame pointer elimination is disabled.
291 static bool needsFP(const MachineFunction &MF) {
292 const MachineFrameInfo *MFI = MF.getFrameInfo();
293 return NoFramePointerElim || MFI->hasVarSizedObjects();
296 static bool spillsCR(const MachineFunction &MF) {
297 const PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
298 return FuncInfo->isCRSpilled();
301 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
302 BitVector Reserved(getNumRegs());
303 Reserved.set(PPC::R0);
304 Reserved.set(PPC::R1);
305 Reserved.set(PPC::LR);
306 Reserved.set(PPC::LR8);
308 // In Linux, r2 is reserved for the OS.
309 if (!Subtarget.isDarwin())
310 Reserved.set(PPC::R2);
312 // On PPC64, r13 is the thread pointer. Never allocate this register. Note
313 // that this is over conservative, as it also prevents allocation of R31 when
314 // the FP is not needed.
315 if (Subtarget.isPPC64()) {
316 Reserved.set(PPC::R13);
317 Reserved.set(PPC::R31);
320 Reserved.set(PPC::R0); // FIXME (64-bit): Remove
322 Reserved.set(PPC::X0);
323 Reserved.set(PPC::X1);
324 Reserved.set(PPC::X13);
325 Reserved.set(PPC::X31);
329 Reserved.set(PPC::R31);
334 //===----------------------------------------------------------------------===//
335 // Stack Frame Processing methods
336 //===----------------------------------------------------------------------===//
338 // hasFP - Return true if the specified function actually has a dedicated frame
339 // pointer register. This is true if the function needs a frame pointer and has
340 // a non-zero stack size.
341 bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
342 const MachineFrameInfo *MFI = MF.getFrameInfo();
343 return MFI->getStackSize() && needsFP(MF);
346 /// MustSaveLR - Return true if this function requires that we save the LR
347 /// register onto the stack in the prolog and restore it in the epilog of the
349 static bool MustSaveLR(const MachineFunction &MF) {
350 const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
352 // We need an save/restore of LR if there is any use/def of LR explicitly, or
353 // if there is some use of the LR stack slot (e.g. for builtin_return_address.
354 return MFI->usesLR() || MFI->isLRStoreRequired() ||
355 // FIXME: Anything that has a call should clobber the LR register,
356 // isn't this redundant??
357 MF.getFrameInfo()->hasCalls();
360 void PPCRegisterInfo::
361 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
362 MachineBasicBlock::iterator I) const {
363 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
367 /// findScratchRegister - Find a 'free' PPC register. Try for a call-clobbered
368 /// register first and then a spilled callee-saved register if that fails.
370 unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
371 const TargetRegisterClass *RC, int SPAdj) {
372 assert(RS && "Register scavenging must be on");
373 unsigned Reg = RS->FindUnusedReg(RC, true);
374 // FIXME: move ARM callee-saved reg scan to target independent code, then
375 // search for already spilled CS register here.
377 Reg = RS->scavengeRegister(RC, II, SPAdj);
381 /// lowerDynamicAlloc - Generate the code for allocating an object in the
382 /// current frame. The sequence of code with be in the general form
384 /// addi R0, SP, #frameSize ; get the address of the previous frame
385 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
386 /// addi Rnew, SP, #maxCalFrameSize ; get the top of the allocation
388 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
389 int SPAdj, RegScavenger *RS) const {
390 // Get the instruction.
391 MachineInstr &MI = *II;
392 // Get the instruction's basic block.
393 MachineBasicBlock &MBB = *MI.getParent();
394 // Get the basic block's function.
395 MachineFunction &MF = *MBB.getParent();
396 // Get the frame info.
397 MachineFrameInfo *MFI = MF.getFrameInfo();
398 // Determine whether 64-bit pointers are used.
399 bool LP64 = Subtarget.isPPC64();
401 // Get the maximum call stack size.
402 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
403 // Get the total frame size.
404 unsigned FrameSize = MFI->getStackSize();
406 // Get stack alignments.
407 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
408 unsigned MaxAlign = MFI->getMaxAlignment();
409 assert(MaxAlign <= TargetAlign &&
410 "Dynamic alloca with large aligns not supported");
412 // Determine the previous frame's address. If FrameSize can't be
413 // represented as 16 bits or we need special alignment, then we load the
414 // previous frame's address from 0(SP). Why not do an addis of the hi?
415 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
416 // Constructing the constant and adding would take 3 instructions.
417 // Fortunately, a frame greater than 32K is rare.
418 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
419 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
420 const TargetRegisterClass *RC = LP64 ? G8RC : GPRC;
422 // FIXME (64-bit): Use "findScratchRegister"
425 Reg = findScratchRegister(II, RS, RC, SPAdj);
429 if (MaxAlign < TargetAlign && isInt16(FrameSize)) {
430 BuildMI(MBB, II, TII.get(PPC::ADDI), Reg)
435 if (EnablePPCRS) // FIXME (64-bit): Use "true" version.
436 BuildMI(MBB, II, TII.get(PPC::LD), Reg)
440 BuildMI(MBB, II, TII.get(PPC::LD), PPC::X0)
444 BuildMI(MBB, II, TII.get(PPC::LWZ), Reg)
449 // Grow the stack and update the stack pointer link, then determine the
450 // address of new allocated space.
452 if (EnablePPCRS) // FIXME (64-bit): Use "true" version.
453 BuildMI(MBB, II, TII.get(PPC::STDUX))
454 .addReg(Reg, false, false, true)
456 .addReg(MI.getOperand(1).getReg());
458 BuildMI(MBB, II, TII.get(PPC::STDUX))
459 .addReg(PPC::X0, false, false, true)
461 .addReg(MI.getOperand(1).getReg());
463 if (!MI.getOperand(1).isKill())
464 BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
466 .addImm(maxCallFrameSize);
468 // Implicitly kill the register.
469 BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
471 .addImm(maxCallFrameSize)
472 .addReg(MI.getOperand(1).getReg(), false, true, true);
474 BuildMI(MBB, II, TII.get(PPC::STWUX))
475 .addReg(Reg, false, false, true)
477 .addReg(MI.getOperand(1).getReg());
479 if (!MI.getOperand(1).isKill())
480 BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
482 .addImm(maxCallFrameSize);
484 // Implicitly kill the register.
485 BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
487 .addImm(maxCallFrameSize)
488 .addReg(MI.getOperand(1).getReg(), false, true, true);
491 // Discard the DYNALLOC instruction.
495 /// lowerCRSpilling - Generate the code for spilling a CR register. Instead of
496 /// reserving a whole register (R0), we scrounge for one here. This generates
499 /// mfcr rA ; Move the conditional register into GPR rA.
500 /// rlwinm rA, rA, SB, 0, 31 ; Shift the bits left so they are in CR0's slot.
501 /// stw rA, FI ; Store rA to the frame.
503 void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
504 unsigned FrameIndex, int SPAdj,
505 RegScavenger *RS) const {
506 // Get the instruction.
507 MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset>, <FI>
508 // Get the instruction's basic block.
509 MachineBasicBlock &MBB = *MI.getParent();
511 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
512 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
513 const TargetRegisterClass *RC = Subtarget.isPPC64() ? G8RC : GPRC;
514 unsigned Reg = findScratchRegister(II, RS, RC, SPAdj);
516 // We need to store the CR in the low 4-bits of the saved value. First, issue
517 // an MFCR to save all of the CRBits.
518 if (!MI.getOperand(0).isKill())
519 BuildMI(MBB, II, TII.get(PPC::MFCR), Reg);
521 // Implicitly kill the CR register.
522 BuildMI(MBB, II, TII.get(PPC::MFCR), Reg)
523 .addReg(MI.getOperand(0).getReg(), false, true, true);
525 // If the saved register wasn't CR0, shift the bits left so that they are in
527 unsigned SrcReg = MI.getOperand(0).getReg();
528 if (SrcReg != PPC::CR0)
529 // rlwinm rA, rA, ShiftBits, 0, 31.
530 BuildMI(MBB, II, TII.get(PPC::RLWINM), Reg)
531 .addReg(Reg, false, false, true)
532 .addImm(PPCRegisterInfo::getRegisterNumbering(SrcReg) * 4)
536 addFrameReference(BuildMI(MBB, II, TII.get(PPC::STW))
537 .addReg(Reg, false, false, MI.getOperand(1).getImm()),
540 // Discard the pseudo instruction.
544 void PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
545 int SPAdj, RegScavenger *RS) const {
546 assert(SPAdj == 0 && "Unexpected");
548 // Get the instruction.
549 MachineInstr &MI = *II;
550 // Get the instruction's basic block.
551 MachineBasicBlock &MBB = *MI.getParent();
552 // Get the basic block's function.
553 MachineFunction &MF = *MBB.getParent();
554 // Get the frame info.
555 MachineFrameInfo *MFI = MF.getFrameInfo();
557 // Find out which operand is the frame index.
558 unsigned FIOperandNo = 0;
559 while (!MI.getOperand(FIOperandNo).isFrameIndex()) {
561 assert(FIOperandNo != MI.getNumOperands() &&
562 "Instr doesn't have FrameIndex operand!");
564 // Take into account whether it's an add or mem instruction
565 unsigned OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
566 if (MI.getOpcode() == TargetInstrInfo::INLINEASM)
567 OffsetOperandNo = FIOperandNo-1;
569 // Get the frame index.
570 int FrameIndex = MI.getOperand(FIOperandNo).getIndex();
572 // Get the frame pointer save index. Users of this index are primarily
573 // DYNALLOC instructions.
574 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
575 int FPSI = FI->getFramePointerSaveIndex();
576 // Get the instruction opcode.
577 unsigned OpC = MI.getOpcode();
579 // Special case for dynamic alloca.
580 if (FPSI && FrameIndex == FPSI &&
581 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
582 lowerDynamicAlloc(II, SPAdj, RS);
586 // Special case for pseudo-op SPILL_CR.
587 if (EnablePPCRS) // FIXME (64-bit): Enable by default
588 if (OpC == PPC::SPILL_CR) {
589 lowerCRSpilling(II, FrameIndex, SPAdj, RS);
593 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
594 MI.getOperand(FIOperandNo).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1,
597 // Figure out if the offset in the instruction is shifted right two bits. This
598 // is true for instructions like "STD", which the machine implicitly adds two
600 bool isIXAddr = false;
610 // Now add the frame object offset to the offset from r1.
611 int Offset = MFI->getObjectOffset(FrameIndex);
613 Offset += MI.getOperand(OffsetOperandNo).getImm();
615 Offset += MI.getOperand(OffsetOperandNo).getImm() << 2;
617 // If we're not using a Frame Pointer that has been set to the value of the
618 // SP before having the stack size subtracted from it, then add the stack size
619 // to Offset to get the correct offset.
620 Offset += MFI->getStackSize();
622 // If we can, encode the offset directly into the instruction. If this is a
623 // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If
624 // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits
625 // clear can be encoded. This is extremely uncommon, because normally you
626 // only "std" to a stack slot that is at least 4-byte aligned, but it can
627 // happen in invalid code.
628 if (isInt16(Offset) && (!isIXAddr || (Offset & 3) == 0)) {
630 Offset >>= 2; // The actual encoded value has the low two bits zero.
631 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
635 // The offset doesn't fit into a single register, scavenge one to build the
637 // FIXME: figure out what SPAdj is doing here.
639 // FIXME (64-bit): Use "findScratchRegister".
642 SReg = findScratchRegister(II, RS, &PPC::GPRCRegClass, SPAdj);
646 // Insert a set of rA with the full offset value before the ld, st, or add
647 BuildMI(MBB, II, TII.get(PPC::LIS), SReg)
648 .addImm(Offset >> 16);
649 BuildMI(MBB, II, TII.get(PPC::ORI), SReg)
650 .addReg(SReg, false, false, true)
653 // Convert into indexed form of the instruction:
655 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
656 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
657 unsigned OperandBase;
659 if (OpC != TargetInstrInfo::INLINEASM) {
660 assert(ImmToIdxMap.count(OpC) &&
661 "No indexed form of load or store available!");
662 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
663 MI.setDesc(TII.get(NewOpcode));
666 OperandBase = OffsetOperandNo;
669 unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
670 MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
671 MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false);
674 /// VRRegNo - Map from a numbered VR register to its enum value.
676 static const unsigned short VRRegNo[] = {
677 PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
678 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15,
679 PPC::V16, PPC::V17, PPC::V18, PPC::V19, PPC::V20, PPC::V21, PPC::V22, PPC::V23,
680 PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
683 /// RemoveVRSaveCode - We have found that this function does not need any code
684 /// to manipulate the VRSAVE register, even though it uses vector registers.
685 /// This can happen when the only registers used are known to be live in or out
686 /// of the function. Remove all of the VRSAVE related code from the function.
687 static void RemoveVRSaveCode(MachineInstr *MI) {
688 MachineBasicBlock *Entry = MI->getParent();
689 MachineFunction *MF = Entry->getParent();
691 // We know that the MTVRSAVE instruction immediately follows MI. Remove it.
692 MachineBasicBlock::iterator MBBI = MI;
694 assert(MBBI != Entry->end() && MBBI->getOpcode() == PPC::MTVRSAVE);
695 MBBI->eraseFromParent();
697 bool RemovedAllMTVRSAVEs = true;
698 // See if we can find and remove the MTVRSAVE instruction from all of the
700 for (MachineFunction::iterator I = MF->begin(), E = MF->end(); I != E; ++I) {
701 // If last instruction is a return instruction, add an epilogue
702 if (!I->empty() && I->back().getDesc().isReturn()) {
703 bool FoundIt = false;
704 for (MBBI = I->end(); MBBI != I->begin(); ) {
706 if (MBBI->getOpcode() == PPC::MTVRSAVE) {
707 MBBI->eraseFromParent(); // remove it.
712 RemovedAllMTVRSAVEs &= FoundIt;
716 // If we found and removed all MTVRSAVE instructions, remove the read of
718 if (RemovedAllMTVRSAVEs) {
720 assert(MBBI != Entry->begin() && "UPDATE_VRSAVE is first instr in block?");
722 assert(MBBI->getOpcode() == PPC::MFVRSAVE && "VRSAVE instrs wandered?");
723 MBBI->eraseFromParent();
726 // Finally, nuke the UPDATE_VRSAVE.
727 MI->eraseFromParent();
730 // HandleVRSaveUpdate - MI is the UPDATE_VRSAVE instruction introduced by the
731 // instruction selector. Based on the vector registers that have been used,
732 // transform this into the appropriate ORI instruction.
733 static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
734 MachineFunction *MF = MI->getParent()->getParent();
736 unsigned UsedRegMask = 0;
737 for (unsigned i = 0; i != 32; ++i)
738 if (MF->getRegInfo().isPhysRegUsed(VRRegNo[i]))
739 UsedRegMask |= 1 << (31-i);
741 // Live in and live out values already must be in the mask, so don't bother
743 for (MachineRegisterInfo::livein_iterator
744 I = MF->getRegInfo().livein_begin(),
745 E = MF->getRegInfo().livein_end(); I != E; ++I) {
746 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(I->first);
747 if (VRRegNo[RegNo] == I->first) // If this really is a vector reg.
748 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
750 for (MachineRegisterInfo::liveout_iterator
751 I = MF->getRegInfo().liveout_begin(),
752 E = MF->getRegInfo().liveout_end(); I != E; ++I) {
753 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(*I);
754 if (VRRegNo[RegNo] == *I) // If this really is a vector reg.
755 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
758 // If no registers are used, turn this into a copy.
759 if (UsedRegMask == 0) {
760 // Remove all VRSAVE code.
761 RemoveVRSaveCode(MI);
765 unsigned SrcReg = MI->getOperand(1).getReg();
766 unsigned DstReg = MI->getOperand(0).getReg();
768 if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
769 if (DstReg != SrcReg)
770 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
772 .addImm(UsedRegMask);
774 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
775 .addReg(SrcReg, false, false, true)
776 .addImm(UsedRegMask);
777 } else if ((UsedRegMask & 0xFFFF0000) == UsedRegMask) {
778 if (DstReg != SrcReg)
779 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
781 .addImm(UsedRegMask >> 16);
783 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
784 .addReg(SrcReg, false, false, true)
785 .addImm(UsedRegMask >> 16);
787 if (DstReg != SrcReg)
788 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
790 .addImm(UsedRegMask >> 16);
792 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
793 .addReg(SrcReg, false, false, true)
794 .addImm(UsedRegMask >> 16);
796 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
797 .addReg(DstReg, false, false, true)
798 .addImm(UsedRegMask & 0xFFFF);
801 // Remove the old UPDATE_VRSAVE instruction.
802 MI->eraseFromParent();
805 /// determineFrameLayout - Determine the size of the frame and maximum call
807 void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
808 MachineFrameInfo *MFI = MF.getFrameInfo();
810 // Get the number of bytes to allocate from the FrameInfo
811 unsigned FrameSize = MFI->getStackSize();
813 // Get the alignments provided by the target, and the maximum alignment
814 // (if any) of the fixed frame objects.
815 unsigned MaxAlign = MFI->getMaxAlignment();
816 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
817 unsigned AlignMask = TargetAlign - 1; //
819 // If we are a leaf function, and use up to 224 bytes of stack space,
820 // don't have a frame pointer, calls, or dynamic alloca then we do not need
821 // to adjust the stack pointer (we fit in the Red Zone).
822 if (FrameSize <= 224 && // Fits in red zone.
823 !MFI->hasVarSizedObjects() && // No dynamic alloca.
824 !MFI->hasCalls() && // No calls.
825 MaxAlign <= TargetAlign) { // No special alignment.
827 MFI->setStackSize(0);
831 // Get the maximum call frame size of all the calls.
832 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
834 // Maximum call frame needs to be at least big enough for linkage and 8 args.
835 unsigned minCallFrameSize =
836 PPCFrameInfo::getMinCallFrameSize(Subtarget.isPPC64(),
837 Subtarget.isMachoABI());
838 maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
840 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
841 // that allocations will be aligned.
842 if (MFI->hasVarSizedObjects())
843 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
845 // Update maximum call frame size.
846 MFI->setMaxCallFrameSize(maxCallFrameSize);
848 // Include call frame size in total.
849 FrameSize += maxCallFrameSize;
851 // Make sure the frame is aligned.
852 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
854 // Update frame info.
855 MFI->setStackSize(FrameSize);
859 PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
860 RegScavenger *RS) const {
861 // Save and clear the LR state.
862 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
863 unsigned LR = getRARegister();
864 FI->setUsesLR(MF.getRegInfo().isPhysRegUsed(LR));
865 MF.getRegInfo().setPhysRegUnused(LR);
867 // Save R31 if necessary
868 int FPSI = FI->getFramePointerSaveIndex();
869 bool IsPPC64 = Subtarget.isPPC64();
870 bool IsELF32_ABI = Subtarget.isELF32_ABI();
871 bool IsMachoABI = Subtarget.isMachoABI();
872 MachineFrameInfo *MFI = MF.getFrameInfo();
874 // If the frame pointer save index hasn't been defined yet.
875 if (!FPSI && (NoFramePointerElim || MFI->hasVarSizedObjects()) &&
877 // Find out what the fix offset of the frame pointer save area.
878 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64,
880 // Allocate the frame index for frame pointer save area.
881 FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
883 FI->setFramePointerSaveIndex(FPSI);
886 // Reserve a slot closest to SP or frame pointer if we have a dynalloc or
887 // a large stack, which will require scavenging a register to materialize a
889 // FIXME: this doesn't actually check stack size, so is a bit pessimistic
890 // FIXME: doesn't detect whether or not we need to spill vXX, which requires
893 if (EnablePPCRS) // FIXME (64-bit): Enable.
894 if (needsFP(MF) || spillsCR(MF)) {
895 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
896 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
897 const TargetRegisterClass *RC = IsPPC64 ? G8RC : GPRC;
898 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
899 RC->getAlignment()));
904 PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
905 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
906 MachineBasicBlock::iterator MBBI = MBB.begin();
907 MachineFrameInfo *MFI = MF.getFrameInfo();
908 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
910 // Prepare for frame info.
911 unsigned FrameLabelId = 0;
913 // Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
915 for (unsigned i = 0; MBBI != MBB.end(); ++i, ++MBBI) {
916 if (MBBI->getOpcode() == PPC::UPDATE_VRSAVE) {
917 HandleVRSaveUpdate(MBBI, TII);
922 // Move MBBI back to the beginning of the function.
925 // Work out frame sizes.
926 determineFrameLayout(MF);
927 unsigned FrameSize = MFI->getStackSize();
929 int NegFrameSize = -FrameSize;
931 // Get processor type.
932 bool IsPPC64 = Subtarget.isPPC64();
933 // Get operating system
934 bool IsMachoABI = Subtarget.isMachoABI();
935 // Check if the link register (LR) has been used.
936 bool UsesLR = MustSaveLR(MF);
937 // Do we have a frame pointer for this function?
938 bool HasFP = hasFP(MF) && FrameSize;
940 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
941 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
945 BuildMI(MBB, MBBI, TII.get(PPC::MFLR8), PPC::X0);
948 BuildMI(MBB, MBBI, TII.get(PPC::STD))
954 BuildMI(MBB, MBBI, TII.get(PPC::STD))
956 .addImm(LROffset / 4)
960 BuildMI(MBB, MBBI, TII.get(PPC::MFLR), PPC::R0);
963 BuildMI(MBB, MBBI, TII.get(PPC::STW))
969 BuildMI(MBB, MBBI, TII.get(PPC::STW))
975 // Skip if a leaf routine.
976 if (!FrameSize) return;
978 // Get stack alignments.
979 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
980 unsigned MaxAlign = MFI->getMaxAlignment();
982 if (MMI && MMI->needsFrameInfo()) {
983 // Mark effective beginning of when frame pointer becomes valid.
984 FrameLabelId = MMI->NextLabelID();
985 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(FrameLabelId).addImm(0);
988 // Adjust stack pointer: r1 += NegFrameSize.
989 // If there is a preferred stack alignment, align R1 now
992 if (MaxAlign > TargetAlign) {
993 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
994 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
996 BuildMI(MBB, MBBI, TII.get(PPC::RLWINM), PPC::R0)
999 .addImm(32 - Log2_32(MaxAlign))
1001 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC) ,PPC::R0)
1002 .addReg(PPC::R0, false, false, true)
1003 .addImm(NegFrameSize);
1004 BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
1008 } else if (isInt16(NegFrameSize)) {
1009 BuildMI(MBB, MBBI, TII.get(PPC::STWU), PPC::R1)
1011 .addImm(NegFrameSize)
1014 BuildMI(MBB, MBBI, TII.get(PPC::LIS), PPC::R0)
1015 .addImm(NegFrameSize >> 16);
1016 BuildMI(MBB, MBBI, TII.get(PPC::ORI), PPC::R0)
1017 .addReg(PPC::R0, false, false, true)
1018 .addImm(NegFrameSize & 0xFFFF);
1019 BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
1025 if (MaxAlign > TargetAlign) {
1026 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1027 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1029 BuildMI(MBB, MBBI, TII.get(PPC::RLDICL), PPC::X0)
1032 .addImm(64 - Log2_32(MaxAlign));
1033 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC8), PPC::X0)
1035 .addImm(NegFrameSize);
1036 BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
1040 } else if (isInt16(NegFrameSize)) {
1041 BuildMI(MBB, MBBI, TII.get(PPC::STDU), PPC::X1)
1043 .addImm(NegFrameSize / 4)
1046 BuildMI(MBB, MBBI, TII.get(PPC::LIS8), PPC::X0)
1047 .addImm(NegFrameSize >> 16);
1048 BuildMI(MBB, MBBI, TII.get(PPC::ORI8), PPC::X0)
1049 .addReg(PPC::X0, false, false, true)
1050 .addImm(NegFrameSize & 0xFFFF);
1051 BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
1058 if (MMI && MMI->needsFrameInfo()) {
1059 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
1062 // Show update of SP.
1063 MachineLocation SPDst(MachineLocation::VirtualFP);
1064 MachineLocation SPSrc(MachineLocation::VirtualFP, NegFrameSize);
1065 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
1067 MachineLocation SP(IsPPC64 ? PPC::X31 : PPC::R31);
1068 Moves.push_back(MachineMove(FrameLabelId, SP, SP));
1072 MachineLocation FPDst(MachineLocation::VirtualFP, FPOffset);
1073 MachineLocation FPSrc(IsPPC64 ? PPC::X31 : PPC::R31);
1074 Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
1077 // Add callee saved registers to move list.
1078 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1079 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
1080 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
1081 unsigned Reg = CSI[I].getReg();
1082 if (Reg == PPC::LR || Reg == PPC::LR8) continue;
1083 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
1084 MachineLocation CSSrc(Reg);
1085 Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
1088 MachineLocation LRDst(MachineLocation::VirtualFP, LROffset);
1089 MachineLocation LRSrc(IsPPC64 ? PPC::LR8 : PPC::LR);
1090 Moves.push_back(MachineMove(FrameLabelId, LRDst, LRSrc));
1092 // Mark effective beginning of when frame pointer is ready.
1093 unsigned ReadyLabelId = MMI->NextLabelID();
1094 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(ReadyLabelId).addImm(0);
1096 MachineLocation FPDst(HasFP ? (IsPPC64 ? PPC::X31 : PPC::R31) :
1097 (IsPPC64 ? PPC::X1 : PPC::R1));
1098 MachineLocation FPSrc(MachineLocation::VirtualFP);
1099 Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
1102 // If there is a frame pointer, copy R1 into R31
1105 BuildMI(MBB, MBBI, TII.get(PPC::OR), PPC::R31)
1109 BuildMI(MBB, MBBI, TII.get(PPC::OR8), PPC::X31)
1116 void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
1117 MachineBasicBlock &MBB) const {
1118 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1119 assert(MBBI->getOpcode() == PPC::BLR &&
1120 "Can only insert epilog into returning blocks");
1122 // Get alignment info so we know how to restore r1
1123 const MachineFrameInfo *MFI = MF.getFrameInfo();
1124 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1125 unsigned MaxAlign = MFI->getMaxAlignment();
1127 // Get the number of bytes allocated from the FrameInfo.
1128 unsigned FrameSize = MFI->getStackSize();
1130 // Get processor type.
1131 bool IsPPC64 = Subtarget.isPPC64();
1132 // Get operating system
1133 bool IsMachoABI = Subtarget.isMachoABI();
1134 // Check if the link register (LR) has been used.
1135 bool UsesLR = MustSaveLR(MF);
1136 // Do we have a frame pointer for this function?
1137 bool HasFP = hasFP(MF) && FrameSize;
1139 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
1140 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
1143 // The loaded (or persistent) stack pointer value is offset by the 'stwu'
1144 // on entry to the function. Add this offset back now.
1145 if (!Subtarget.isPPC64()) {
1146 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1147 !MFI->hasVarSizedObjects()) {
1148 BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
1149 .addReg(PPC::R1).addImm(FrameSize);
1151 BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
1154 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1155 !MFI->hasVarSizedObjects()) {
1156 BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
1157 .addReg(PPC::X1).addImm(FrameSize);
1159 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
1166 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X0)
1167 .addImm(LROffset/4).addReg(PPC::X1);
1170 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X31)
1171 .addImm(FPOffset/4).addReg(PPC::X1);
1174 BuildMI(MBB, MBBI, TII.get(PPC::MTLR8)).addReg(PPC::X0);
1177 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R0)
1178 .addImm(LROffset).addReg(PPC::R1);
1181 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R31)
1182 .addImm(FPOffset).addReg(PPC::R1);
1185 BuildMI(MBB, MBBI, TII.get(PPC::MTLR)).addReg(PPC::R0);
1189 unsigned PPCRegisterInfo::getRARegister() const {
1190 return !Subtarget.isPPC64() ? PPC::LR : PPC::LR8;
1193 unsigned PPCRegisterInfo::getFrameRegister(MachineFunction &MF) const {
1194 if (!Subtarget.isPPC64())
1195 return hasFP(MF) ? PPC::R31 : PPC::R1;
1197 return hasFP(MF) ? PPC::X31 : PPC::X1;
1200 void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
1202 // Initial state of the frame pointer is R1.
1203 MachineLocation Dst(MachineLocation::VirtualFP);
1204 MachineLocation Src(PPC::R1, 0);
1205 Moves.push_back(MachineMove(0, Dst, Src));
1208 unsigned PPCRegisterInfo::getEHExceptionRegister() const {
1209 return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
1212 unsigned PPCRegisterInfo::getEHHandlerRegister() const {
1213 return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;
1216 int PPCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
1217 // FIXME: Most probably dwarf numbers differs for Linux and Darwin
1218 return PPCGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
1221 #include "PPCGenRegisterInfo.inc"