1 //===- SPURegisterInfo.cpp - Cell SPU Register Information ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by a team from the Computer Systems Research
6 // Department at The Aerospace Corporation.
8 // See README.txt for details.
10 //===----------------------------------------------------------------------===//
12 // This file contains the PowerPC implementation of the MRegisterInfo class.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "reginfo"
18 #include "SPURegisterInfo.h"
19 #include "SPURegisterNames.h"
20 #include "SPUInstrBuilder.h"
21 #include "SPUSubtarget.h"
22 #include "SPUMachineFunction.h"
23 #include "SPUFrameInfo.h"
24 #include "llvm/Constants.h"
25 #include "llvm/Type.h"
26 #include "llvm/CodeGen/ValueTypes.h"
27 #include "llvm/CodeGen/MachineInstrBuilder.h"
28 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "llvm/CodeGen/MachineFunction.h"
30 #include "llvm/CodeGen/MachineFrameInfo.h"
31 #include "llvm/CodeGen/MachineLocation.h"
32 #include "llvm/CodeGen/SelectionDAGNodes.h"
33 #include "llvm/CodeGen/ValueTypes.h"
34 #include "llvm/Target/TargetFrameInfo.h"
35 #include "llvm/Target/TargetInstrInfo.h"
36 #include "llvm/Target/TargetMachine.h"
37 #include "llvm/Target/TargetOptions.h"
38 #include "llvm/Support/CommandLine.h"
39 #include "llvm/Support/Debug.h"
40 #include "llvm/Support/MathExtras.h"
41 #include "llvm/ADT/BitVector.h"
42 #include "llvm/ADT/STLExtras.h"
48 /// getRegisterNumbering - Given the enum value for some register, e.g.
49 /// PPC::F14, return the number that it corresponds to (e.g. 14).
50 unsigned SPURegisterInfo::getRegisterNumbering(unsigned RegEnum) {
53 case SPU::R0: return 0;
54 case SPU::R1: return 1;
55 case SPU::R2: return 2;
56 case SPU::R3: return 3;
57 case SPU::R4: return 4;
58 case SPU::R5: return 5;
59 case SPU::R6: return 6;
60 case SPU::R7: return 7;
61 case SPU::R8: return 8;
62 case SPU::R9: return 9;
63 case SPU::R10: return 10;
64 case SPU::R11: return 11;
65 case SPU::R12: return 12;
66 case SPU::R13: return 13;
67 case SPU::R14: return 14;
68 case SPU::R15: return 15;
69 case SPU::R16: return 16;
70 case SPU::R17: return 17;
71 case SPU::R18: return 18;
72 case SPU::R19: return 19;
73 case SPU::R20: return 20;
74 case SPU::R21: return 21;
75 case SPU::R22: return 22;
76 case SPU::R23: return 23;
77 case SPU::R24: return 24;
78 case SPU::R25: return 25;
79 case SPU::R26: return 26;
80 case SPU::R27: return 27;
81 case SPU::R28: return 28;
82 case SPU::R29: return 29;
83 case SPU::R30: return 30;
84 case SPU::R31: return 31;
85 case SPU::R32: return 32;
86 case SPU::R33: return 33;
87 case SPU::R34: return 34;
88 case SPU::R35: return 35;
89 case SPU::R36: return 36;
90 case SPU::R37: return 37;
91 case SPU::R38: return 38;
92 case SPU::R39: return 39;
93 case SPU::R40: return 40;
94 case SPU::R41: return 41;
95 case SPU::R42: return 42;
96 case SPU::R43: return 43;
97 case SPU::R44: return 44;
98 case SPU::R45: return 45;
99 case SPU::R46: return 46;
100 case SPU::R47: return 47;
101 case SPU::R48: return 48;
102 case SPU::R49: return 49;
103 case SPU::R50: return 50;
104 case SPU::R51: return 51;
105 case SPU::R52: return 52;
106 case SPU::R53: return 53;
107 case SPU::R54: return 54;
108 case SPU::R55: return 55;
109 case SPU::R56: return 56;
110 case SPU::R57: return 57;
111 case SPU::R58: return 58;
112 case SPU::R59: return 59;
113 case SPU::R60: return 60;
114 case SPU::R61: return 61;
115 case SPU::R62: return 62;
116 case SPU::R63: return 63;
117 case SPU::R64: return 64;
118 case SPU::R65: return 65;
119 case SPU::R66: return 66;
120 case SPU::R67: return 67;
121 case SPU::R68: return 68;
122 case SPU::R69: return 69;
123 case SPU::R70: return 70;
124 case SPU::R71: return 71;
125 case SPU::R72: return 72;
126 case SPU::R73: return 73;
127 case SPU::R74: return 74;
128 case SPU::R75: return 75;
129 case SPU::R76: return 76;
130 case SPU::R77: return 77;
131 case SPU::R78: return 78;
132 case SPU::R79: return 79;
133 case SPU::R80: return 80;
134 case SPU::R81: return 81;
135 case SPU::R82: return 82;
136 case SPU::R83: return 83;
137 case SPU::R84: return 84;
138 case SPU::R85: return 85;
139 case SPU::R86: return 86;
140 case SPU::R87: return 87;
141 case SPU::R88: return 88;
142 case SPU::R89: return 89;
143 case SPU::R90: return 90;
144 case SPU::R91: return 91;
145 case SPU::R92: return 92;
146 case SPU::R93: return 93;
147 case SPU::R94: return 94;
148 case SPU::R95: return 95;
149 case SPU::R96: return 96;
150 case SPU::R97: return 97;
151 case SPU::R98: return 98;
152 case SPU::R99: return 99;
153 case SPU::R100: return 100;
154 case SPU::R101: return 101;
155 case SPU::R102: return 102;
156 case SPU::R103: return 103;
157 case SPU::R104: return 104;
158 case SPU::R105: return 105;
159 case SPU::R106: return 106;
160 case SPU::R107: return 107;
161 case SPU::R108: return 108;
162 case SPU::R109: return 109;
163 case SPU::R110: return 110;
164 case SPU::R111: return 111;
165 case SPU::R112: return 112;
166 case SPU::R113: return 113;
167 case SPU::R114: return 114;
168 case SPU::R115: return 115;
169 case SPU::R116: return 116;
170 case SPU::R117: return 117;
171 case SPU::R118: return 118;
172 case SPU::R119: return 119;
173 case SPU::R120: return 120;
174 case SPU::R121: return 121;
175 case SPU::R122: return 122;
176 case SPU::R123: return 123;
177 case SPU::R124: return 124;
178 case SPU::R125: return 125;
179 case SPU::R126: return 126;
180 case SPU::R127: return 127;
182 std::cerr << "Unhandled reg in SPURegisterInfo::getRegisterNumbering!\n";
187 SPURegisterInfo::SPURegisterInfo(const SPUSubtarget &subtarget,
188 const TargetInstrInfo &tii) :
189 SPUGenRegisterInfo(SPU::ADJCALLSTACKDOWN, SPU::ADJCALLSTACKUP),
190 Subtarget(subtarget),
196 SPURegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
197 MachineBasicBlock::iterator MI,
198 unsigned SrcReg, int FrameIdx,
199 const TargetRegisterClass *RC) const
202 if (RC == SPU::GPRCRegisterClass) {
203 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
206 } else if (RC == SPU::R64CRegisterClass) {
207 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
210 } else if (RC == SPU::R64FPRegisterClass) {
211 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
214 } else if (RC == SPU::R32CRegisterClass) {
215 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
218 } else if (RC == SPU::R32FPRegisterClass) {
219 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
222 } else if (RC == SPU::R16CRegisterClass) {
223 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset()) ?
227 assert(0 && "Unknown regclass!");
231 addFrameReference(BuildMI(MBB, MI, TII.get(opc)).addReg(SrcReg), FrameIdx);
234 void SPURegisterInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
235 SmallVectorImpl<MachineOperand> &Addr,
236 const TargetRegisterClass *RC,
237 SmallVectorImpl<MachineInstr*> &NewMIs) const {
238 cerr << "storeRegToAddr() invoked!\n";
241 if (Addr[0].isFrameIndex()) {
242 /* do what storeRegToStackSlot does here */
245 if (RC == SPU::GPRCRegisterClass) {
246 /* Opc = PPC::STW; */
247 } else if (RC == SPU::R16CRegisterClass) {
248 /* Opc = PPC::STD; */
249 } else if (RC == SPU::R32CRegisterClass) {
250 /* Opc = PPC::STFD; */
251 } else if (RC == SPU::R32FPRegisterClass) {
252 /* Opc = PPC::STFD; */
253 } else if (RC == SPU::R64FPRegisterClass) {
254 /* Opc = PPC::STFS; */
255 } else if (RC == SPU::VECREGRegisterClass) {
256 /* Opc = PPC::STVX; */
258 assert(0 && "Unknown regclass!");
261 MachineInstrBuilder MIB = BuildMI(TII.get(Opc))
262 .addReg(SrcReg, false, false, true);
263 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
264 MachineOperand &MO = Addr[i];
266 MIB.addReg(MO.getReg());
267 else if (MO.isImmediate())
268 MIB.addImm(MO.getImmedValue());
270 MIB.addFrameIndex(MO.getFrameIndex());
272 NewMIs.push_back(MIB);
277 SPURegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
278 MachineBasicBlock::iterator MI,
279 unsigned DestReg, int FrameIdx,
280 const TargetRegisterClass *RC) const
283 if (RC == SPU::GPRCRegisterClass) {
284 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
287 } else if (RC == SPU::R64CRegisterClass) {
288 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
291 } else if (RC == SPU::R64FPRegisterClass) {
292 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
295 } else if (RC == SPU::R32CRegisterClass) {
296 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
299 } else if (RC == SPU::R32FPRegisterClass) {
300 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
303 } else if (RC == SPU::R16CRegisterClass) {
304 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
308 assert(0 && "Unknown regclass in loadRegFromStackSlot!");
312 addFrameReference(BuildMI(MBB, MI, TII.get(opc)).addReg(DestReg), FrameIdx);
316 \note We are really pessimistic here about what kind of a load we're doing.
318 void SPURegisterInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
319 SmallVectorImpl<MachineOperand> &Addr,
320 const TargetRegisterClass *RC,
321 SmallVectorImpl<MachineInstr*> &NewMIs)
323 cerr << "loadRegToAddr() invoked!\n";
326 if (Addr[0].isFrameIndex()) {
327 /* do what loadRegFromStackSlot does here... */
330 if (RC == SPU::R16CRegisterClass) {
331 /* Opc = PPC::LWZ; */
332 } else if (RC == SPU::R32CRegisterClass) {
334 } else if (RC == SPU::R32FPRegisterClass) {
335 /* Opc = PPC::LFD; */
336 } else if (RC == SPU::R64FPRegisterClass) {
337 /* Opc = PPC::LFS; */
338 } else if (RC == SPU::VECREGRegisterClass) {
339 /* Opc = PPC::LVX; */
340 } else if (RC == SPU::GPRCRegisterClass) {
341 /* Opc = something else! */
343 assert(0 && "Unknown regclass!");
346 MachineInstrBuilder MIB = BuildMI(TII.get(Opc), DestReg);
347 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
348 MachineOperand &MO = Addr[i];
350 MIB.addReg(MO.getReg());
351 else if (MO.isImmediate())
352 MIB.addImm(MO.getImmedValue());
354 MIB.addFrameIndex(MO.getFrameIndex());
356 NewMIs.push_back(MIB);
360 void SPURegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
361 MachineBasicBlock::iterator MI,
362 unsigned DestReg, unsigned SrcReg,
363 const TargetRegisterClass *DestRC,
364 const TargetRegisterClass *SrcRC) const
366 if (DestRC != SrcRC) {
367 cerr << "SPURegisterInfo::copyRegToReg(): DestRC != SrcRC not supported!\n";
371 /* if (DestRC == SPU::R8CRegisterClass) {
372 BuildMI(MBB, MI, TII.get(SPU::ORBIr8), DestReg).addReg(SrcReg).addImm(0);
374 if (DestRC == SPU::R16CRegisterClass) {
375 BuildMI(MBB, MI, TII.get(SPU::ORHIr16), DestReg).addReg(SrcReg).addImm(0);
376 } else if (DestRC == SPU::R32CRegisterClass) {
377 BuildMI(MBB, MI, TII.get(SPU::ORIr32), DestReg).addReg(SrcReg).addImm(0);
378 } else if (DestRC == SPU::R32FPRegisterClass) {
379 BuildMI(MBB, MI, TII.get(SPU::ORIf32), DestReg).addReg(SrcReg).addImm(0);
380 } else if (DestRC == SPU::R64CRegisterClass) {
381 BuildMI(MBB, MI, TII.get(SPU::ORIr64), DestReg).addReg(SrcReg).addImm(0);
382 } else if (DestRC == SPU::R64FPRegisterClass) {
383 BuildMI(MBB, MI, TII.get(SPU::ORIf64), DestReg).addReg(SrcReg).addImm(0);
384 } else if (DestRC == SPU::GPRCRegisterClass) {
385 BuildMI(MBB, MI, TII.get(SPU::ORgprc), DestReg).addReg(SrcReg)
387 } else if (DestRC == SPU::VECREGRegisterClass) {
388 BuildMI(MBB, MI, TII.get(SPU::ORv4i32), DestReg).addReg(SrcReg)
391 std::cerr << "Attempt to copy unknown/unsupported register class!\n";
396 void SPURegisterInfo::reMaterialize(MachineBasicBlock &MBB,
397 MachineBasicBlock::iterator I,
399 const MachineInstr *Orig) const {
400 MachineInstr *MI = Orig->clone();
401 MI->getOperand(0).setReg(DestReg);
405 // SPU's 128-bit registers used for argument passing:
406 static const unsigned SPU_ArgRegs[] = {
407 SPU::R3, SPU::R4, SPU::R5, SPU::R6, SPU::R7, SPU::R8, SPU::R9,
408 SPU::R10, SPU::R11, SPU::R12, SPU::R13, SPU::R14, SPU::R15, SPU::R16,
409 SPU::R17, SPU::R18, SPU::R19, SPU::R20, SPU::R21, SPU::R22, SPU::R23,
410 SPU::R24, SPU::R25, SPU::R26, SPU::R27, SPU::R28, SPU::R29, SPU::R30,
411 SPU::R31, SPU::R32, SPU::R33, SPU::R34, SPU::R35, SPU::R36, SPU::R37,
412 SPU::R38, SPU::R39, SPU::R40, SPU::R41, SPU::R42, SPU::R43, SPU::R44,
413 SPU::R45, SPU::R46, SPU::R47, SPU::R48, SPU::R49, SPU::R50, SPU::R51,
414 SPU::R52, SPU::R53, SPU::R54, SPU::R55, SPU::R56, SPU::R57, SPU::R58,
415 SPU::R59, SPU::R60, SPU::R61, SPU::R62, SPU::R63, SPU::R64, SPU::R65,
416 SPU::R66, SPU::R67, SPU::R68, SPU::R69, SPU::R70, SPU::R71, SPU::R72,
417 SPU::R73, SPU::R74, SPU::R75, SPU::R76, SPU::R77, SPU::R78, SPU::R79
421 SPURegisterInfo::getArgRegs()
427 SPURegisterInfo::getNumArgRegs()
429 return sizeof(SPU_ArgRegs) / sizeof(SPU_ArgRegs[0]);
433 SPURegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const
435 // Cell ABI calling convention
436 static const unsigned SPU_CalleeSaveRegs[] = {
437 SPU::R80, SPU::R81, SPU::R82, SPU::R83,
438 SPU::R84, SPU::R85, SPU::R86, SPU::R87,
439 SPU::R88, SPU::R89, SPU::R90, SPU::R91,
440 SPU::R92, SPU::R93, SPU::R94, SPU::R95,
441 SPU::R96, SPU::R97, SPU::R98, SPU::R99,
442 SPU::R100, SPU::R101, SPU::R102, SPU::R103,
443 SPU::R104, SPU::R105, SPU::R106, SPU::R107,
444 SPU::R108, SPU::R109, SPU::R110, SPU::R111,
445 SPU::R112, SPU::R113, SPU::R114, SPU::R115,
446 SPU::R116, SPU::R117, SPU::R118, SPU::R119,
447 SPU::R120, SPU::R121, SPU::R122, SPU::R123,
448 SPU::R124, SPU::R125, SPU::R126, SPU::R127,
449 SPU::R2, /* environment pointer */
450 SPU::R1, /* stack pointer */
451 SPU::R0, /* link register */
455 return SPU_CalleeSaveRegs;
458 const TargetRegisterClass* const*
459 SPURegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const
461 // Cell ABI Calling Convention
462 static const TargetRegisterClass * const SPU_CalleeSaveRegClasses[] = {
463 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
464 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
465 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
466 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
467 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
468 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
469 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
470 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
471 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
472 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
473 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
474 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
475 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
476 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
477 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
478 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
479 &SPU::GPRCRegClass, /* environment pointer */
480 &SPU::GPRCRegClass, /* stack pointer */
481 &SPU::GPRCRegClass, /* link register */
485 return SPU_CalleeSaveRegClasses;
489 R0 (link register), R1 (stack pointer) and R2 (environment pointer -- this is
490 generally unused) are the Cell's reserved registers
492 BitVector SPURegisterInfo::getReservedRegs(const MachineFunction &MF) const {
493 BitVector Reserved(getNumRegs());
494 Reserved.set(SPU::R0); // LR
495 Reserved.set(SPU::R1); // SP
496 Reserved.set(SPU::R2); // environment pointer
500 /// foldMemoryOperand - SPU, like PPC, can only fold spills into
501 /// copy instructions, turning them into load/store instructions.
503 SPURegisterInfo::foldMemoryOperand(MachineInstr *MI, unsigned OpNum,
504 int FrameIndex) const
506 #if SOMEDAY_SCOTT_LOOKS_AT_ME_AGAIN
507 unsigned Opc = MI->getOpcode();
508 MachineInstr *NewMI = 0;
510 if ((Opc == SPU::ORr32
511 || Opc == SPU::ORv4i32)
512 && MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
513 if (OpNum == 0) { // move -> store
514 unsigned InReg = MI->getOperand(1).getReg();
515 if (FrameIndex < SPUFrameInfo::maxFrameOffset()) {
516 NewMI = addFrameReference(BuildMI(TII.get(SPU::STQDr32)).addReg(InReg),
519 } else { // move -> load
520 unsigned OutReg = MI->getOperand(0).getReg();
521 Opc = (FrameIndex < SPUFrameInfo::maxFrameOffset()) ? SPU::STQDr32 : SPU::STQXr32;
522 NewMI = addFrameReference(BuildMI(TII.get(Opc), OutReg), FrameIndex);
527 NewMI->copyKillDeadInfo(MI);
535 /// General-purpose load/store fold to operand code
537 SPURegisterInfo::foldMemoryOperand(MachineInstr *MI, unsigned OpNum,
538 MachineInstr *LoadMI) const
543 //===----------------------------------------------------------------------===//
544 // Stack Frame Processing methods
545 //===----------------------------------------------------------------------===//
547 // needsFP - Return true if the specified function should have a dedicated frame
548 // pointer register. This is true if the function has variable sized allocas or
549 // if frame pointer elimination is disabled.
551 static bool needsFP(const MachineFunction &MF) {
552 const MachineFrameInfo *MFI = MF.getFrameInfo();
553 return NoFramePointerElim || MFI->hasVarSizedObjects();
556 //--------------------------------------------------------------------------
557 // hasFP - Return true if the specified function actually has a dedicated frame
558 // pointer register. This is true if the function needs a frame pointer and has
559 // a non-zero stack size.
561 SPURegisterInfo::hasFP(const MachineFunction &MF) const {
562 const MachineFrameInfo *MFI = MF.getFrameInfo();
563 return MFI->getStackSize() && needsFP(MF);
566 //--------------------------------------------------------------------------
568 SPURegisterInfo::eliminateCallFramePseudoInstr(MachineFunction &MF,
569 MachineBasicBlock &MBB,
570 MachineBasicBlock::iterator I)
573 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
578 SPURegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
579 RegScavenger *RS) const
581 assert(SPAdj == 0 && "Unexpected SP adjacency == 0");
584 MachineInstr &MI = *II;
585 MachineBasicBlock &MBB = *MI.getParent();
586 MachineFunction &MF = *MBB.getParent();
587 MachineFrameInfo *MFI = MF.getFrameInfo();
589 while (!MI.getOperand(i).isFrameIndex()) {
591 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
594 MachineOperand &SPOp = MI.getOperand(i);
595 int FrameIndex = SPOp.getFrameIndex();
597 // Now add the frame object offset to the offset from r1.
598 int Offset = MFI->getObjectOffset(FrameIndex);
600 // Most instructions, except for generated FrameIndex additions using AIr32,
601 // have the immediate in operand 1. AIr32, in this case, has the immediate
603 unsigned OpNo = (MI.getOpcode() != SPU::AIr32 ? 1 : 2);
604 MachineOperand &MO = MI.getOperand(OpNo);
606 // Offset is biased by $lr's slot at the bottom.
607 Offset += MO.getImmedValue() + MFI->getStackSize()
608 + SPUFrameInfo::minStackSize();
609 assert((Offset & 0xf) == 0
610 && "16-byte alignment violated in SPURegisterInfo::eliminateFrameIndex");
612 // Replace the FrameIndex with base register with $sp (aka $r1)
613 SPOp.ChangeToRegister(SPU::R1, false);
614 if (Offset > SPUFrameInfo::maxFrameOffset()
615 || Offset < SPUFrameInfo::minFrameOffset()) {
616 cerr << "Large stack adjustment ("
618 << ") in SPURegisterInfo::eliminateFrameIndex.";
620 MO.ChangeToImmediate(Offset);
624 /// determineFrameLayout - Determine the size of the frame and maximum call
627 SPURegisterInfo::determineFrameLayout(MachineFunction &MF) const
629 MachineFrameInfo *MFI = MF.getFrameInfo();
631 // Get the number of bytes to allocate from the FrameInfo
632 unsigned FrameSize = MFI->getStackSize();
634 // Get the alignments provided by the target, and the maximum alignment
635 // (if any) of the fixed frame objects.
636 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
637 unsigned Align = std::max(TargetAlign, MFI->getMaxAlignment());
638 assert(isPowerOf2_32(Align) && "Alignment is not power of 2");
639 unsigned AlignMask = Align - 1;
641 // Get the maximum call frame size of all the calls.
642 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
644 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
645 // that allocations will be aligned.
646 if (MFI->hasVarSizedObjects())
647 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
649 // Update maximum call frame size.
650 MFI->setMaxCallFrameSize(maxCallFrameSize);
652 // Include call frame size in total.
653 FrameSize += maxCallFrameSize;
655 // Make sure the frame is aligned.
656 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
658 // Update frame info.
659 MFI->setStackSize(FrameSize);
662 void SPURegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
666 // Save and clear the LR state.
667 SPUFunctionInfo *FI = MF.getInfo<SPUFunctionInfo>();
668 FI->setUsesLR(MF.isPhysRegUsed(LR));
670 // Mark LR and SP unused, since the prolog spills them to stack and
671 // we don't want anyone else to spill them for us.
673 // Also, unless R2 is really used someday, don't spill it automatically.
674 MF.setPhysRegUnused(SPU::R0);
675 MF.setPhysRegUnused(SPU::R1);
676 MF.setPhysRegUnused(SPU::R2);
679 void SPURegisterInfo::emitPrologue(MachineFunction &MF) const
681 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
682 MachineBasicBlock::iterator MBBI = MBB.begin();
683 MachineFrameInfo *MFI = MF.getFrameInfo();
684 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
686 // Prepare for debug frame info.
687 bool hasDebugInfo = MMI && MMI->hasDebugInfo();
688 unsigned FrameLabelId = 0;
690 // Move MBBI back to the beginning of the function.
693 // Work out frame sizes.
694 determineFrameLayout(MF);
695 int FrameSize = MFI->getStackSize();
697 assert((FrameSize & 0xf) == 0
698 && "SPURegisterInfo::emitPrologue: FrameSize not aligned");
701 FrameSize = -(FrameSize + SPUFrameInfo::minStackSize());
703 // Mark effective beginning of when frame pointer becomes valid.
704 FrameLabelId = MMI->NextLabelID();
705 BuildMI(MBB, MBBI, TII.get(ISD::LABEL)).addImm(FrameLabelId);
708 // Adjust stack pointer, spilling $lr -> 16($sp) and $sp -> -FrameSize($sp)
710 BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R0).addImm(16)
712 if (isS10Constant(FrameSize)) {
713 // Spill $sp to adjusted $sp
714 BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R1).addImm(FrameSize)
716 // Adjust $sp by required amout
717 BuildMI(MBB, MBBI, TII.get(SPU::AIr32), SPU::R1).addReg(SPU::R1)
719 } else if (FrameSize <= (1 << 16) - 1 && FrameSize >= -(1 << 16)) {
720 // Frame size can be loaded into ILr32n, so temporarily spill $r2 and use
721 // $r2 to adjust $sp:
722 BuildMI(MBB, MBBI, TII.get(SPU::STQDr128), SPU::R2)
725 BuildMI(MBB, MBBI, TII.get(SPU::ILr32), SPU::R2)
727 BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R1)
730 BuildMI(MBB, MBBI, TII.get(SPU::Ar32), SPU::R1)
733 BuildMI(MBB, MBBI, TII.get(SPU::SFIr32), SPU::R2)
736 BuildMI(MBB, MBBI, TII.get(SPU::LQXr128), SPU::R2)
740 cerr << "Unhandled frame size: " << FrameSize << "\n";
745 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
747 // Show update of SP.
748 MachineLocation SPDst(MachineLocation::VirtualFP);
749 MachineLocation SPSrc(MachineLocation::VirtualFP, -FrameSize);
750 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
752 // Add callee saved registers to move list.
753 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
754 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
755 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
756 unsigned Reg = CSI[I].getReg();
757 if (Reg == SPU::R0) continue;
758 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
759 MachineLocation CSSrc(Reg);
760 Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
763 // Mark effective beginning of when frame pointer is ready.
764 unsigned ReadyLabelId = MMI->NextLabelID();
765 BuildMI(MBB, MBBI, TII.get(ISD::LABEL)).addImm(ReadyLabelId);
767 MachineLocation FPDst(SPU::R1);
768 MachineLocation FPSrc(MachineLocation::VirtualFP);
769 Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
772 // This is a leaf function -- insert a branch hint iff there are
773 // sufficient number instructions in the basic block. Note that
774 // this is just a best guess based on the basic block's size.
775 if (MBB.size() >= (unsigned) SPUFrameInfo::branchHintPenalty()) {
776 MachineBasicBlock::iterator MBBI = prior(MBB.end());
777 // Insert terminator label
778 unsigned BranchLabelId = MMI->NextLabelID();
779 BuildMI(MBB, MBBI, TII.get(SPU::LABEL)).addImm(BranchLabelId);
785 SPURegisterInfo::emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
787 MachineBasicBlock::iterator MBBI = prior(MBB.end());
788 const MachineFrameInfo *MFI = MF.getFrameInfo();
789 int FrameSize = MFI->getStackSize();
790 int LinkSlotOffset = SPUFrameInfo::stackSlotSize();
792 assert(MBBI->getOpcode() == SPU::RET &&
793 "Can only insert epilog into returning blocks");
794 assert((FrameSize & 0xf) == 0
795 && "SPURegisterInfo::emitEpilogue: FrameSize not aligned");
797 FrameSize = FrameSize + SPUFrameInfo::minStackSize();
798 if (isS10Constant(FrameSize + LinkSlotOffset)) {
799 // Reload $lr, adjust $sp by required amount
800 // Note: We do this to slightly improve dual issue -- not by much, but it
801 // is an opportunity for dual issue.
802 BuildMI(MBB, MBBI, TII.get(SPU::LQDr128), SPU::R0)
803 .addImm(FrameSize + LinkSlotOffset)
805 BuildMI(MBB, MBBI, TII.get(SPU::AIr32), SPU::R1)
808 } else if (FrameSize <= (1 << 16) - 1 && FrameSize >= -(1 << 16)) {
809 // Frame size can be loaded into ILr32n, so temporarily spill $r2 and use
810 // $r2 to adjust $sp:
811 BuildMI(MBB, MBBI, TII.get(SPU::STQDr128), SPU::R2)
814 BuildMI(MBB, MBBI, TII.get(SPU::ILr32), SPU::R2)
816 BuildMI(MBB, MBBI, TII.get(SPU::Ar32), SPU::R1)
819 BuildMI(MBB, MBBI, TII.get(SPU::LQDr128), SPU::R0)
822 BuildMI(MBB, MBBI, TII.get(SPU::SFIr32), SPU::R2).
825 BuildMI(MBB, MBBI, TII.get(SPU::LQXr128), SPU::R2)
829 cerr << "Unhandled frame size: " << FrameSize << "\n";
836 SPURegisterInfo::getRARegister() const
842 SPURegisterInfo::getFrameRegister(MachineFunction &MF) const
848 SPURegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const
850 // Initial state of the frame pointer is R1.
851 MachineLocation Dst(MachineLocation::VirtualFP);
852 MachineLocation Src(SPU::R1, 0);
853 Moves.push_back(MachineMove(0, Dst, Src));
858 SPURegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
859 // FIXME: Most probably dwarf numbers differs for Linux and Darwin
860 return SPUGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
863 #include "SPUGenRegisterInfo.inc"