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> EnablePPC32RS("enable-ppc32-regscavenger",
48 cl::desc("Enable PPC32 register scavenger"),
50 cl::opt<bool> EnablePPC64RS("enable-ppc64-regscavenger",
52 cl::desc("Enable PPC64 register scavenger"),
54 #define EnableRegisterScavenging \
55 ((EnablePPC32RS && !Subtarget.isPPC64()) || \
56 (EnablePPC64RS && Subtarget.isPPC64()))
58 // FIXME (64-bit): Should be inlined.
60 PPCRegisterInfo::requiresRegisterScavenging(const MachineFunction &) const {
61 return EnableRegisterScavenging;
64 /// getRegisterNumbering - Given the enum value for some register, e.g.
65 /// PPC::F14, return the number that it corresponds to (e.g. 14).
66 unsigned PPCRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
70 case R0 : case X0 : case F0 : case V0 : case CR0: case CR0LT: return 0;
71 case R1 : case X1 : case F1 : case V1 : case CR1: case CR0GT: return 1;
72 case R2 : case X2 : case F2 : case V2 : case CR2: case CR0EQ: return 2;
73 case R3 : case X3 : case F3 : case V3 : case CR3: case CR0UN: return 3;
74 case R4 : case X4 : case F4 : case V4 : case CR4: case CR1LT: return 4;
75 case R5 : case X5 : case F5 : case V5 : case CR5: case CR1GT: return 5;
76 case R6 : case X6 : case F6 : case V6 : case CR6: case CR1EQ: return 6;
77 case R7 : case X7 : case F7 : case V7 : case CR7: case CR1UN: return 7;
78 case R8 : case X8 : case F8 : case V8 : case CR2LT: return 8;
79 case R9 : case X9 : case F9 : case V9 : case CR2GT: return 9;
80 case R10: case X10: case F10: case V10: case CR2EQ: return 10;
81 case R11: case X11: case F11: case V11: case CR2UN: return 11;
82 case R12: case X12: case F12: case V12: case CR3LT: return 12;
83 case R13: case X13: case F13: case V13: case CR3GT: return 13;
84 case R14: case X14: case F14: case V14: case CR3EQ: return 14;
85 case R15: case X15: case F15: case V15: case CR3UN: return 15;
86 case R16: case X16: case F16: case V16: case CR4LT: return 16;
87 case R17: case X17: case F17: case V17: case CR4GT: return 17;
88 case R18: case X18: case F18: case V18: case CR4EQ: return 18;
89 case R19: case X19: case F19: case V19: case CR4UN: return 19;
90 case R20: case X20: case F20: case V20: case CR5LT: return 20;
91 case R21: case X21: case F21: case V21: case CR5GT: return 21;
92 case R22: case X22: case F22: case V22: case CR5EQ: return 22;
93 case R23: case X23: case F23: case V23: case CR5UN: return 23;
94 case R24: case X24: case F24: case V24: case CR6LT: return 24;
95 case R25: case X25: case F25: case V25: case CR6GT: return 25;
96 case R26: case X26: case F26: case V26: case CR6EQ: return 26;
97 case R27: case X27: case F27: case V27: case CR6UN: return 27;
98 case R28: case X28: case F28: case V28: case CR7LT: return 28;
99 case R29: case X29: case F29: case V29: case CR7GT: return 29;
100 case R30: case X30: case F30: case V30: case CR7EQ: return 30;
101 case R31: case X31: case F31: case V31: case CR7UN: return 31;
103 cerr << "Unhandled reg in PPCRegisterInfo::getRegisterNumbering!\n";
108 PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
109 const TargetInstrInfo &tii)
110 : PPCGenRegisterInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
111 Subtarget(ST), TII(tii) {
112 ImmToIdxMap[PPC::LD] = PPC::LDX; ImmToIdxMap[PPC::STD] = PPC::STDX;
113 ImmToIdxMap[PPC::LBZ] = PPC::LBZX; ImmToIdxMap[PPC::STB] = PPC::STBX;
114 ImmToIdxMap[PPC::LHZ] = PPC::LHZX; ImmToIdxMap[PPC::LHA] = PPC::LHAX;
115 ImmToIdxMap[PPC::LWZ] = PPC::LWZX; ImmToIdxMap[PPC::LWA] = PPC::LWAX;
116 ImmToIdxMap[PPC::LFS] = PPC::LFSX; ImmToIdxMap[PPC::LFD] = PPC::LFDX;
117 ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX;
118 ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX;
119 ImmToIdxMap[PPC::ADDI] = PPC::ADD4;
122 ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8;
123 ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8;
124 ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8;
125 ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX;
126 ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
129 void PPCRegisterInfo::reMaterialize(MachineBasicBlock &MBB,
130 MachineBasicBlock::iterator I,
132 const MachineInstr *Orig) const {
133 MachineInstr *MI = Orig->clone();
134 MI->getOperand(0).setReg(DestReg);
139 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
140 // 32-bit Darwin calling convention.
141 static const unsigned Macho32_CalleeSavedRegs[] = {
142 PPC::R13, PPC::R14, PPC::R15,
143 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
144 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
145 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
146 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
148 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
149 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
150 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
151 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
154 PPC::CR2, PPC::CR3, PPC::CR4,
155 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
156 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
157 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
159 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
160 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
161 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
166 static const unsigned ELF32_CalleeSavedRegs[] = {
167 PPC::R13, PPC::R14, PPC::R15,
168 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
169 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
170 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
171 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
174 PPC::F10, PPC::F11, PPC::F12, PPC::F13,
175 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
176 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
177 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
178 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
181 PPC::CR2, PPC::CR3, PPC::CR4,
182 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
183 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
184 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
186 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
187 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
188 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
192 // 64-bit Darwin calling convention.
193 static const unsigned Macho64_CalleeSavedRegs[] = {
195 PPC::X16, PPC::X17, PPC::X18, PPC::X19,
196 PPC::X20, PPC::X21, PPC::X22, PPC::X23,
197 PPC::X24, PPC::X25, PPC::X26, PPC::X27,
198 PPC::X28, PPC::X29, PPC::X30, PPC::X31,
200 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
201 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
202 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
203 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
206 PPC::CR2, PPC::CR3, PPC::CR4,
207 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
208 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
209 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
211 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
212 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
213 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
218 if (Subtarget.isMachoABI())
219 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegs :
220 Macho32_CalleeSavedRegs;
223 return ELF32_CalleeSavedRegs;
226 const TargetRegisterClass* const*
227 PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
228 // 32-bit Macho calling convention.
229 static const TargetRegisterClass * const Macho32_CalleeSavedRegClasses[] = {
230 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
231 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
232 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
233 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
234 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
236 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
237 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
238 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
239 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
240 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
242 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
244 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
245 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
246 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
248 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
249 &PPC::CRBITRCRegClass,
250 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
251 &PPC::CRBITRCRegClass,
252 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
253 &PPC::CRBITRCRegClass,
255 &PPC::GPRCRegClass, 0
258 static const TargetRegisterClass * const ELF32_CalleeSavedRegClasses[] = {
259 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
260 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
261 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
262 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
263 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
266 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
267 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
268 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
269 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
270 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
271 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
273 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
275 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
276 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
277 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
279 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
280 &PPC::CRBITRCRegClass,
281 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
282 &PPC::CRBITRCRegClass,
283 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
284 &PPC::CRBITRCRegClass,
286 &PPC::GPRCRegClass, 0
289 // 64-bit Macho calling convention.
290 static const TargetRegisterClass * const Macho64_CalleeSavedRegClasses[] = {
291 &PPC::G8RCRegClass,&PPC::G8RCRegClass,
292 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
293 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
294 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
295 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
297 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
298 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
299 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
300 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
301 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
303 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
305 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
306 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
307 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
309 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
310 &PPC::CRBITRCRegClass,
311 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
312 &PPC::CRBITRCRegClass,
313 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
314 &PPC::CRBITRCRegClass,
316 &PPC::G8RCRegClass, 0
319 if (Subtarget.isMachoABI())
320 return Subtarget.isPPC64() ? Macho64_CalleeSavedRegClasses :
321 Macho32_CalleeSavedRegClasses;
324 return ELF32_CalleeSavedRegClasses;
327 // needsFP - Return true if the specified function should have a dedicated frame
328 // pointer register. This is true if the function has variable sized allocas or
329 // if frame pointer elimination is disabled.
331 static bool needsFP(const MachineFunction &MF) {
332 const MachineFrameInfo *MFI = MF.getFrameInfo();
333 return NoFramePointerElim || MFI->hasVarSizedObjects();
336 static bool spillsCR(const MachineFunction &MF) {
337 const PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
338 return FuncInfo->isCRSpilled();
341 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
342 BitVector Reserved(getNumRegs());
343 Reserved.set(PPC::R0);
344 Reserved.set(PPC::R1);
345 Reserved.set(PPC::LR);
346 Reserved.set(PPC::LR8);
348 // In Linux, r2 is reserved for the OS.
349 if (!Subtarget.isDarwin())
350 Reserved.set(PPC::R2);
352 // On PPC64, r13 is the thread pointer. Never allocate this register. Note
353 // that this is over conservative, as it also prevents allocation of R31 when
354 // the FP is not needed.
355 if (Subtarget.isPPC64()) {
356 Reserved.set(PPC::R13);
357 Reserved.set(PPC::R31);
359 if (!EnableRegisterScavenging)
360 Reserved.set(PPC::R0); // FIXME (64-bit): Remove
362 Reserved.set(PPC::X0);
363 Reserved.set(PPC::X1);
364 Reserved.set(PPC::X13);
365 Reserved.set(PPC::X31);
369 Reserved.set(PPC::R31);
374 //===----------------------------------------------------------------------===//
375 // Stack Frame Processing methods
376 //===----------------------------------------------------------------------===//
378 // hasFP - Return true if the specified function actually has a dedicated frame
379 // pointer register. This is true if the function needs a frame pointer and has
380 // a non-zero stack size.
381 bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
382 const MachineFrameInfo *MFI = MF.getFrameInfo();
383 return MFI->getStackSize() && needsFP(MF);
386 /// MustSaveLR - Return true if this function requires that we save the LR
387 /// register onto the stack in the prolog and restore it in the epilog of the
389 static bool MustSaveLR(const MachineFunction &MF) {
390 const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
392 // We need an save/restore of LR if there is any use/def of LR explicitly, or
393 // if there is some use of the LR stack slot (e.g. for builtin_return_address.
394 return MFI->usesLR() || MFI->isLRStoreRequired() ||
395 // FIXME: Anything that has a call should clobber the LR register,
396 // isn't this redundant??
397 MF.getFrameInfo()->hasCalls();
400 void PPCRegisterInfo::
401 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
402 MachineBasicBlock::iterator I) const {
403 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
407 /// findScratchRegister - Find a 'free' PPC register. Try for a call-clobbered
408 /// register first and then a spilled callee-saved register if that fails.
410 unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
411 const TargetRegisterClass *RC, int SPAdj) {
412 assert(RS && "Register scavenging must be on");
413 unsigned Reg = RS->FindUnusedReg(RC, true);
414 // FIXME: move ARM callee-saved reg scan to target independent code, then
415 // search for already spilled CS register here.
417 Reg = RS->scavengeRegister(RC, II, SPAdj);
421 /// lowerDynamicAlloc - Generate the code for allocating an object in the
422 /// current frame. The sequence of code with be in the general form
424 /// addi R0, SP, #frameSize ; get the address of the previous frame
425 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
426 /// addi Rnew, SP, #maxCalFrameSize ; get the top of the allocation
428 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
429 int SPAdj, RegScavenger *RS) const {
430 // Get the instruction.
431 MachineInstr &MI = *II;
432 // Get the instruction's basic block.
433 MachineBasicBlock &MBB = *MI.getParent();
434 // Get the basic block's function.
435 MachineFunction &MF = *MBB.getParent();
436 // Get the frame info.
437 MachineFrameInfo *MFI = MF.getFrameInfo();
438 // Determine whether 64-bit pointers are used.
439 bool LP64 = Subtarget.isPPC64();
441 // Get the maximum call stack size.
442 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
443 // Get the total frame size.
444 unsigned FrameSize = MFI->getStackSize();
446 // Get stack alignments.
447 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
448 unsigned MaxAlign = MFI->getMaxAlignment();
449 assert(MaxAlign <= TargetAlign &&
450 "Dynamic alloca with large aligns not supported");
452 // Determine the previous frame's address. If FrameSize can't be
453 // represented as 16 bits or we need special alignment, then we load the
454 // previous frame's address from 0(SP). Why not do an addis of the hi?
455 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
456 // Constructing the constant and adding would take 3 instructions.
457 // Fortunately, a frame greater than 32K is rare.
458 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
459 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
460 const TargetRegisterClass *RC = LP64 ? G8RC : GPRC;
462 // FIXME (64-bit): Use "findScratchRegister"
464 if (EnableRegisterScavenging)
465 Reg = findScratchRegister(II, RS, RC, SPAdj);
469 if (MaxAlign < TargetAlign && isInt16(FrameSize)) {
470 BuildMI(MBB, II, TII.get(PPC::ADDI), Reg)
474 if (EnableRegisterScavenging) // FIXME (64-bit): Use "true" part.
475 BuildMI(MBB, II, TII.get(PPC::LD), Reg)
479 BuildMI(MBB, II, TII.get(PPC::LD), PPC::X0)
483 BuildMI(MBB, II, TII.get(PPC::LWZ), Reg)
488 // Grow the stack and update the stack pointer link, then determine the
489 // address of new allocated space.
491 if (EnableRegisterScavenging) // FIXME (64-bit): Use "true" part.
492 BuildMI(MBB, II, TII.get(PPC::STDUX))
493 .addReg(Reg, false, false, true)
495 .addReg(MI.getOperand(1).getReg());
497 BuildMI(MBB, II, TII.get(PPC::STDUX))
498 .addReg(PPC::X0, false, false, true)
500 .addReg(MI.getOperand(1).getReg());
502 if (!MI.getOperand(1).isKill())
503 BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
505 .addImm(maxCallFrameSize);
507 // Implicitly kill the register.
508 BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
510 .addImm(maxCallFrameSize)
511 .addReg(MI.getOperand(1).getReg(), false, true, true);
513 BuildMI(MBB, II, TII.get(PPC::STWUX))
514 .addReg(Reg, false, false, true)
516 .addReg(MI.getOperand(1).getReg());
518 if (!MI.getOperand(1).isKill())
519 BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
521 .addImm(maxCallFrameSize);
523 // Implicitly kill the register.
524 BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
526 .addImm(maxCallFrameSize)
527 .addReg(MI.getOperand(1).getReg(), false, true, true);
530 // Discard the DYNALLOC instruction.
534 /// lowerCRSpilling - Generate the code for spilling a CR register. Instead of
535 /// reserving a whole register (R0), we scrounge for one here. This generates
538 /// mfcr rA ; Move the conditional register into GPR rA.
539 /// rlwinm rA, rA, SB, 0, 31 ; Shift the bits left so they are in CR0's slot.
540 /// stw rA, FI ; Store rA to the frame.
542 void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
543 unsigned FrameIndex, int SPAdj,
544 RegScavenger *RS) const {
545 // Get the instruction.
546 MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset>, <FI>
547 // Get the instruction's basic block.
548 MachineBasicBlock &MBB = *MI.getParent();
550 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
551 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
552 const TargetRegisterClass *RC = Subtarget.isPPC64() ? G8RC : GPRC;
553 unsigned Reg = findScratchRegister(II, RS, RC, SPAdj);
555 // We need to store the CR in the low 4-bits of the saved value. First, issue
556 // an MFCR to save all of the CRBits. Add an implicit kill of the CR.
557 if (!MI.getOperand(0).isKill())
558 BuildMI(MBB, II, TII.get(PPC::MFCR), Reg);
560 // Implicitly kill the CR register.
561 BuildMI(MBB, II, TII.get(PPC::MFCR), Reg)
562 .addReg(MI.getOperand(0).getReg(), false, true, true);
564 // If the saved register wasn't CR0, shift the bits left so that they are in
566 unsigned SrcReg = MI.getOperand(0).getReg();
567 if (SrcReg != PPC::CR0)
568 // rlwinm rA, rA, ShiftBits, 0, 31.
569 BuildMI(MBB, II, TII.get(PPC::RLWINM), Reg)
570 .addReg(Reg, false, false, true)
571 .addImm(PPCRegisterInfo::getRegisterNumbering(SrcReg) * 4)
575 addFrameReference(BuildMI(MBB, II, TII.get(PPC::STW))
576 .addReg(Reg, false, false, MI.getOperand(1).getImm()),
579 // Discard the pseudo instruction.
583 void PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
584 int SPAdj, RegScavenger *RS) const {
585 assert(SPAdj == 0 && "Unexpected");
587 // Get the instruction.
588 MachineInstr &MI = *II;
589 // Get the instruction's basic block.
590 MachineBasicBlock &MBB = *MI.getParent();
591 // Get the basic block's function.
592 MachineFunction &MF = *MBB.getParent();
593 // Get the frame info.
594 MachineFrameInfo *MFI = MF.getFrameInfo();
596 // Find out which operand is the frame index.
597 unsigned FIOperandNo = 0;
598 while (!MI.getOperand(FIOperandNo).isFrameIndex()) {
600 assert(FIOperandNo != MI.getNumOperands() &&
601 "Instr doesn't have FrameIndex operand!");
603 // Take into account whether it's an add or mem instruction
604 unsigned OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
605 if (MI.getOpcode() == TargetInstrInfo::INLINEASM)
606 OffsetOperandNo = FIOperandNo-1;
608 // Get the frame index.
609 int FrameIndex = MI.getOperand(FIOperandNo).getIndex();
611 // Get the frame pointer save index. Users of this index are primarily
612 // DYNALLOC instructions.
613 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
614 int FPSI = FI->getFramePointerSaveIndex();
615 // Get the instruction opcode.
616 unsigned OpC = MI.getOpcode();
618 // Special case for dynamic alloca.
619 if (FPSI && FrameIndex == FPSI &&
620 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
621 lowerDynamicAlloc(II, SPAdj, RS);
625 // Special case for pseudo-op SPILL_CR.
626 if (EnableRegisterScavenging) // FIXME (64-bit): Enable by default.
627 if (OpC == PPC::SPILL_CR) {
628 lowerCRSpilling(II, FrameIndex, SPAdj, RS);
632 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
633 MI.getOperand(FIOperandNo).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1,
636 // Figure out if the offset in the instruction is shifted right two bits. This
637 // is true for instructions like "STD", which the machine implicitly adds two
639 bool isIXAddr = false;
649 // Now add the frame object offset to the offset from r1.
650 int Offset = MFI->getObjectOffset(FrameIndex);
652 Offset += MI.getOperand(OffsetOperandNo).getImm();
654 Offset += MI.getOperand(OffsetOperandNo).getImm() << 2;
656 // If we're not using a Frame Pointer that has been set to the value of the
657 // SP before having the stack size subtracted from it, then add the stack size
658 // to Offset to get the correct offset.
659 Offset += MFI->getStackSize();
661 // If we can, encode the offset directly into the instruction. If this is a
662 // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If
663 // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits
664 // clear can be encoded. This is extremely uncommon, because normally you
665 // only "std" to a stack slot that is at least 4-byte aligned, but it can
666 // happen in invalid code.
667 if (isInt16(Offset) && (!isIXAddr || (Offset & 3) == 0)) {
669 Offset >>= 2; // The actual encoded value has the low two bits zero.
670 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
674 // The offset doesn't fit into a single register, scavenge one to build the
676 // FIXME: figure out what SPAdj is doing here.
678 // FIXME (64-bit): Use "findScratchRegister".
680 if (EnableRegisterScavenging)
681 SReg = findScratchRegister(II, RS, &PPC::GPRCRegClass, SPAdj);
685 // Insert a set of rA with the full offset value before the ld, st, or add
686 BuildMI(MBB, II, TII.get(PPC::LIS), SReg)
687 .addImm(Offset >> 16);
688 BuildMI(MBB, II, TII.get(PPC::ORI), SReg)
689 .addReg(SReg, false, false, true)
692 // Convert into indexed form of the instruction:
694 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
695 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
696 unsigned OperandBase;
698 if (OpC != TargetInstrInfo::INLINEASM) {
699 assert(ImmToIdxMap.count(OpC) &&
700 "No indexed form of load or store available!");
701 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
702 MI.setDesc(TII.get(NewOpcode));
705 OperandBase = OffsetOperandNo;
708 unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
709 MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
710 MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false);
713 /// VRRegNo - Map from a numbered VR register to its enum value.
715 static const unsigned short VRRegNo[] = {
716 PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
717 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15,
718 PPC::V16, PPC::V17, PPC::V18, PPC::V19, PPC::V20, PPC::V21, PPC::V22, PPC::V23,
719 PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
722 /// RemoveVRSaveCode - We have found that this function does not need any code
723 /// to manipulate the VRSAVE register, even though it uses vector registers.
724 /// This can happen when the only registers used are known to be live in or out
725 /// of the function. Remove all of the VRSAVE related code from the function.
726 static void RemoveVRSaveCode(MachineInstr *MI) {
727 MachineBasicBlock *Entry = MI->getParent();
728 MachineFunction *MF = Entry->getParent();
730 // We know that the MTVRSAVE instruction immediately follows MI. Remove it.
731 MachineBasicBlock::iterator MBBI = MI;
733 assert(MBBI != Entry->end() && MBBI->getOpcode() == PPC::MTVRSAVE);
734 MBBI->eraseFromParent();
736 bool RemovedAllMTVRSAVEs = true;
737 // See if we can find and remove the MTVRSAVE instruction from all of the
739 for (MachineFunction::iterator I = MF->begin(), E = MF->end(); I != E; ++I) {
740 // If last instruction is a return instruction, add an epilogue
741 if (!I->empty() && I->back().getDesc().isReturn()) {
742 bool FoundIt = false;
743 for (MBBI = I->end(); MBBI != I->begin(); ) {
745 if (MBBI->getOpcode() == PPC::MTVRSAVE) {
746 MBBI->eraseFromParent(); // remove it.
751 RemovedAllMTVRSAVEs &= FoundIt;
755 // If we found and removed all MTVRSAVE instructions, remove the read of
757 if (RemovedAllMTVRSAVEs) {
759 assert(MBBI != Entry->begin() && "UPDATE_VRSAVE is first instr in block?");
761 assert(MBBI->getOpcode() == PPC::MFVRSAVE && "VRSAVE instrs wandered?");
762 MBBI->eraseFromParent();
765 // Finally, nuke the UPDATE_VRSAVE.
766 MI->eraseFromParent();
769 // HandleVRSaveUpdate - MI is the UPDATE_VRSAVE instruction introduced by the
770 // instruction selector. Based on the vector registers that have been used,
771 // transform this into the appropriate ORI instruction.
772 static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
773 MachineFunction *MF = MI->getParent()->getParent();
775 unsigned UsedRegMask = 0;
776 for (unsigned i = 0; i != 32; ++i)
777 if (MF->getRegInfo().isPhysRegUsed(VRRegNo[i]))
778 UsedRegMask |= 1 << (31-i);
780 // Live in and live out values already must be in the mask, so don't bother
782 for (MachineRegisterInfo::livein_iterator
783 I = MF->getRegInfo().livein_begin(),
784 E = MF->getRegInfo().livein_end(); I != E; ++I) {
785 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(I->first);
786 if (VRRegNo[RegNo] == I->first) // If this really is a vector reg.
787 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
789 for (MachineRegisterInfo::liveout_iterator
790 I = MF->getRegInfo().liveout_begin(),
791 E = MF->getRegInfo().liveout_end(); I != E; ++I) {
792 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(*I);
793 if (VRRegNo[RegNo] == *I) // If this really is a vector reg.
794 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
797 // If no registers are used, turn this into a copy.
798 if (UsedRegMask == 0) {
799 // Remove all VRSAVE code.
800 RemoveVRSaveCode(MI);
804 unsigned SrcReg = MI->getOperand(1).getReg();
805 unsigned DstReg = MI->getOperand(0).getReg();
807 if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
808 if (DstReg != SrcReg)
809 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
811 .addImm(UsedRegMask);
813 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
814 .addReg(SrcReg, false, false, true)
815 .addImm(UsedRegMask);
816 } else if ((UsedRegMask & 0xFFFF0000) == UsedRegMask) {
817 if (DstReg != SrcReg)
818 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
820 .addImm(UsedRegMask >> 16);
822 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
823 .addReg(SrcReg, false, false, true)
824 .addImm(UsedRegMask >> 16);
826 if (DstReg != SrcReg)
827 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
829 .addImm(UsedRegMask >> 16);
831 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
832 .addReg(SrcReg, false, false, true)
833 .addImm(UsedRegMask >> 16);
835 BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
836 .addReg(DstReg, false, false, true)
837 .addImm(UsedRegMask & 0xFFFF);
840 // Remove the old UPDATE_VRSAVE instruction.
841 MI->eraseFromParent();
844 /// determineFrameLayout - Determine the size of the frame and maximum call
846 void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
847 MachineFrameInfo *MFI = MF.getFrameInfo();
849 // Get the number of bytes to allocate from the FrameInfo
850 unsigned FrameSize = MFI->getStackSize();
852 // Get the alignments provided by the target, and the maximum alignment
853 // (if any) of the fixed frame objects.
854 unsigned MaxAlign = MFI->getMaxAlignment();
855 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
856 unsigned AlignMask = TargetAlign - 1; //
858 // If we are a leaf function, and use up to 224 bytes of stack space,
859 // don't have a frame pointer, calls, or dynamic alloca then we do not need
860 // to adjust the stack pointer (we fit in the Red Zone).
861 if (FrameSize <= 224 && // Fits in red zone.
862 !MFI->hasVarSizedObjects() && // No dynamic alloca.
863 !MFI->hasCalls() && // No calls.
864 MaxAlign <= TargetAlign) { // No special alignment.
866 MFI->setStackSize(0);
870 // Get the maximum call frame size of all the calls.
871 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
873 // Maximum call frame needs to be at least big enough for linkage and 8 args.
874 unsigned minCallFrameSize =
875 PPCFrameInfo::getMinCallFrameSize(Subtarget.isPPC64(),
876 Subtarget.isMachoABI());
877 maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
879 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
880 // that allocations will be aligned.
881 if (MFI->hasVarSizedObjects())
882 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
884 // Update maximum call frame size.
885 MFI->setMaxCallFrameSize(maxCallFrameSize);
887 // Include call frame size in total.
888 FrameSize += maxCallFrameSize;
890 // Make sure the frame is aligned.
891 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
893 // Update frame info.
894 MFI->setStackSize(FrameSize);
898 PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
899 RegScavenger *RS) const {
900 // Save and clear the LR state.
901 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
902 unsigned LR = getRARegister();
903 FI->setUsesLR(MF.getRegInfo().isPhysRegUsed(LR));
904 MF.getRegInfo().setPhysRegUnused(LR);
906 // Save R31 if necessary
907 int FPSI = FI->getFramePointerSaveIndex();
908 bool IsPPC64 = Subtarget.isPPC64();
909 bool IsELF32_ABI = Subtarget.isELF32_ABI();
910 bool IsMachoABI = Subtarget.isMachoABI();
911 MachineFrameInfo *MFI = MF.getFrameInfo();
913 // If the frame pointer save index hasn't been defined yet.
914 if (!FPSI && (NoFramePointerElim || MFI->hasVarSizedObjects()) &&
916 // Find out what the fix offset of the frame pointer save area.
917 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64,
919 // Allocate the frame index for frame pointer save area.
920 FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
922 FI->setFramePointerSaveIndex(FPSI);
925 // Reserve a slot closest to SP or frame pointer if we have a dynalloc or
926 // a large stack, which will require scavenging a register to materialize a
928 // FIXME: this doesn't actually check stack size, so is a bit pessimistic
929 // FIXME: doesn't detect whether or not we need to spill vXX, which requires
932 if (EnableRegisterScavenging) // FIXME (64-bit): Enable.
933 if (needsFP(MF) || spillsCR(MF)) {
934 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
935 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
936 const TargetRegisterClass *RC = IsPPC64 ? G8RC : GPRC;
937 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
938 RC->getAlignment()));
943 PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
944 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
945 MachineBasicBlock::iterator MBBI = MBB.begin();
946 MachineFrameInfo *MFI = MF.getFrameInfo();
947 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
949 // Prepare for frame info.
950 unsigned FrameLabelId = 0;
952 // Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
954 for (unsigned i = 0; MBBI != MBB.end(); ++i, ++MBBI) {
955 if (MBBI->getOpcode() == PPC::UPDATE_VRSAVE) {
956 HandleVRSaveUpdate(MBBI, TII);
961 // Move MBBI back to the beginning of the function.
964 // Work out frame sizes.
965 determineFrameLayout(MF);
966 unsigned FrameSize = MFI->getStackSize();
968 int NegFrameSize = -FrameSize;
970 // Get processor type.
971 bool IsPPC64 = Subtarget.isPPC64();
972 // Get operating system
973 bool IsMachoABI = Subtarget.isMachoABI();
974 // Check if the link register (LR) has been used.
975 bool UsesLR = MustSaveLR(MF);
976 // Do we have a frame pointer for this function?
977 bool HasFP = hasFP(MF) && FrameSize;
979 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
980 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
984 BuildMI(MBB, MBBI, TII.get(PPC::MFLR8), PPC::X0);
987 BuildMI(MBB, MBBI, TII.get(PPC::STD))
993 BuildMI(MBB, MBBI, TII.get(PPC::STD))
995 .addImm(LROffset / 4)
999 BuildMI(MBB, MBBI, TII.get(PPC::MFLR), PPC::R0);
1002 BuildMI(MBB, MBBI, TII.get(PPC::STW))
1008 BuildMI(MBB, MBBI, TII.get(PPC::STW))
1014 // Skip if a leaf routine.
1015 if (!FrameSize) return;
1017 // Get stack alignments.
1018 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1019 unsigned MaxAlign = MFI->getMaxAlignment();
1021 if (MMI && MMI->needsFrameInfo()) {
1022 // Mark effective beginning of when frame pointer becomes valid.
1023 FrameLabelId = MMI->NextLabelID();
1024 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(FrameLabelId).addImm(0);
1027 // Adjust stack pointer: r1 += NegFrameSize.
1028 // If there is a preferred stack alignment, align R1 now
1031 if (MaxAlign > TargetAlign) {
1032 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1033 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1035 BuildMI(MBB, MBBI, TII.get(PPC::RLWINM), PPC::R0)
1038 .addImm(32 - Log2_32(MaxAlign))
1040 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC) ,PPC::R0)
1041 .addReg(PPC::R0, false, false, true)
1042 .addImm(NegFrameSize);
1043 BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
1047 } else if (isInt16(NegFrameSize)) {
1048 BuildMI(MBB, MBBI, TII.get(PPC::STWU), PPC::R1)
1050 .addImm(NegFrameSize)
1053 BuildMI(MBB, MBBI, TII.get(PPC::LIS), PPC::R0)
1054 .addImm(NegFrameSize >> 16);
1055 BuildMI(MBB, MBBI, TII.get(PPC::ORI), PPC::R0)
1056 .addReg(PPC::R0, false, false, true)
1057 .addImm(NegFrameSize & 0xFFFF);
1058 BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
1064 if (MaxAlign > TargetAlign) {
1065 assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
1066 assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
1068 BuildMI(MBB, MBBI, TII.get(PPC::RLDICL), PPC::X0)
1071 .addImm(64 - Log2_32(MaxAlign));
1072 BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC8), PPC::X0)
1074 .addImm(NegFrameSize);
1075 BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
1079 } else if (isInt16(NegFrameSize)) {
1080 BuildMI(MBB, MBBI, TII.get(PPC::STDU), PPC::X1)
1082 .addImm(NegFrameSize / 4)
1085 BuildMI(MBB, MBBI, TII.get(PPC::LIS8), PPC::X0)
1086 .addImm(NegFrameSize >> 16);
1087 BuildMI(MBB, MBBI, TII.get(PPC::ORI8), PPC::X0)
1088 .addReg(PPC::X0, false, false, true)
1089 .addImm(NegFrameSize & 0xFFFF);
1090 BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
1097 if (MMI && MMI->needsFrameInfo()) {
1098 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
1101 // Show update of SP.
1102 MachineLocation SPDst(MachineLocation::VirtualFP);
1103 MachineLocation SPSrc(MachineLocation::VirtualFP, NegFrameSize);
1104 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
1106 MachineLocation SP(IsPPC64 ? PPC::X31 : PPC::R31);
1107 Moves.push_back(MachineMove(FrameLabelId, SP, SP));
1111 MachineLocation FPDst(MachineLocation::VirtualFP, FPOffset);
1112 MachineLocation FPSrc(IsPPC64 ? PPC::X31 : PPC::R31);
1113 Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
1116 // Add callee saved registers to move list.
1117 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1118 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
1119 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
1120 unsigned Reg = CSI[I].getReg();
1121 if (Reg == PPC::LR || Reg == PPC::LR8) continue;
1122 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
1123 MachineLocation CSSrc(Reg);
1124 Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
1127 MachineLocation LRDst(MachineLocation::VirtualFP, LROffset);
1128 MachineLocation LRSrc(IsPPC64 ? PPC::LR8 : PPC::LR);
1129 Moves.push_back(MachineMove(FrameLabelId, LRDst, LRSrc));
1131 // Mark effective beginning of when frame pointer is ready.
1132 unsigned ReadyLabelId = MMI->NextLabelID();
1133 BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(ReadyLabelId).addImm(0);
1135 MachineLocation FPDst(HasFP ? (IsPPC64 ? PPC::X31 : PPC::R31) :
1136 (IsPPC64 ? PPC::X1 : PPC::R1));
1137 MachineLocation FPSrc(MachineLocation::VirtualFP);
1138 Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
1141 // If there is a frame pointer, copy R1 into R31
1144 BuildMI(MBB, MBBI, TII.get(PPC::OR), PPC::R31)
1148 BuildMI(MBB, MBBI, TII.get(PPC::OR8), PPC::X31)
1155 void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
1156 MachineBasicBlock &MBB) const {
1157 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1158 assert(MBBI->getOpcode() == PPC::BLR &&
1159 "Can only insert epilog into returning blocks");
1161 // Get alignment info so we know how to restore r1
1162 const MachineFrameInfo *MFI = MF.getFrameInfo();
1163 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1164 unsigned MaxAlign = MFI->getMaxAlignment();
1166 // Get the number of bytes allocated from the FrameInfo.
1167 unsigned FrameSize = MFI->getStackSize();
1169 // Get processor type.
1170 bool IsPPC64 = Subtarget.isPPC64();
1171 // Get operating system
1172 bool IsMachoABI = Subtarget.isMachoABI();
1173 // Check if the link register (LR) has been used.
1174 bool UsesLR = MustSaveLR(MF);
1175 // Do we have a frame pointer for this function?
1176 bool HasFP = hasFP(MF) && FrameSize;
1178 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
1179 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
1182 // The loaded (or persistent) stack pointer value is offset by the 'stwu'
1183 // on entry to the function. Add this offset back now.
1184 if (!Subtarget.isPPC64()) {
1185 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1186 !MFI->hasVarSizedObjects()) {
1187 BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
1188 .addReg(PPC::R1).addImm(FrameSize);
1190 BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
1193 if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
1194 !MFI->hasVarSizedObjects()) {
1195 BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
1196 .addReg(PPC::X1).addImm(FrameSize);
1198 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
1205 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X0)
1206 .addImm(LROffset/4).addReg(PPC::X1);
1209 BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X31)
1210 .addImm(FPOffset/4).addReg(PPC::X1);
1213 BuildMI(MBB, MBBI, TII.get(PPC::MTLR8)).addReg(PPC::X0);
1216 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R0)
1217 .addImm(LROffset).addReg(PPC::R1);
1220 BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R31)
1221 .addImm(FPOffset).addReg(PPC::R1);
1224 BuildMI(MBB, MBBI, TII.get(PPC::MTLR)).addReg(PPC::R0);
1228 unsigned PPCRegisterInfo::getRARegister() const {
1229 return !Subtarget.isPPC64() ? PPC::LR : PPC::LR8;
1232 unsigned PPCRegisterInfo::getFrameRegister(MachineFunction &MF) const {
1233 if (!Subtarget.isPPC64())
1234 return hasFP(MF) ? PPC::R31 : PPC::R1;
1236 return hasFP(MF) ? PPC::X31 : PPC::X1;
1239 void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
1241 // Initial state of the frame pointer is R1.
1242 MachineLocation Dst(MachineLocation::VirtualFP);
1243 MachineLocation Src(PPC::R1, 0);
1244 Moves.push_back(MachineMove(0, Dst, Src));
1247 unsigned PPCRegisterInfo::getEHExceptionRegister() const {
1248 return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
1251 unsigned PPCRegisterInfo::getEHHandlerRegister() const {
1252 return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;
1255 int PPCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
1256 // FIXME: Most probably dwarf numbers differs for Linux and Darwin
1257 return PPCGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
1260 #include "PPCGenRegisterInfo.inc"