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 and is distributed under the
7 // University of Illinois Open Source License. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 // This file contains the PowerPC implementation of the MRegisterInfo class.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "reginfo"
17 #include "SPURegisterInfo.h"
18 #include "SPURegisterNames.h"
19 #include "SPUInstrBuilder.h"
20 #include "SPUSubtarget.h"
21 #include "SPUMachineFunction.h"
22 #include "SPUFrameInfo.h"
23 #include "llvm/Constants.h"
24 #include "llvm/Type.h"
25 #include "llvm/CodeGen/ValueTypes.h"
26 #include "llvm/CodeGen/MachineInstrBuilder.h"
27 #include "llvm/CodeGen/MachineModuleInfo.h"
28 #include "llvm/CodeGen/MachineFunction.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineLocation.h"
31 #include "llvm/CodeGen/SelectionDAGNodes.h"
32 #include "llvm/CodeGen/ValueTypes.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"
47 /// getRegisterNumbering - Given the enum value for some register, e.g.
48 /// PPC::F14, return the number that it corresponds to (e.g. 14).
49 unsigned SPURegisterInfo::getRegisterNumbering(unsigned RegEnum) {
52 case SPU::R0: return 0;
53 case SPU::R1: return 1;
54 case SPU::R2: return 2;
55 case SPU::R3: return 3;
56 case SPU::R4: return 4;
57 case SPU::R5: return 5;
58 case SPU::R6: return 6;
59 case SPU::R7: return 7;
60 case SPU::R8: return 8;
61 case SPU::R9: return 9;
62 case SPU::R10: return 10;
63 case SPU::R11: return 11;
64 case SPU::R12: return 12;
65 case SPU::R13: return 13;
66 case SPU::R14: return 14;
67 case SPU::R15: return 15;
68 case SPU::R16: return 16;
69 case SPU::R17: return 17;
70 case SPU::R18: return 18;
71 case SPU::R19: return 19;
72 case SPU::R20: return 20;
73 case SPU::R21: return 21;
74 case SPU::R22: return 22;
75 case SPU::R23: return 23;
76 case SPU::R24: return 24;
77 case SPU::R25: return 25;
78 case SPU::R26: return 26;
79 case SPU::R27: return 27;
80 case SPU::R28: return 28;
81 case SPU::R29: return 29;
82 case SPU::R30: return 30;
83 case SPU::R31: return 31;
84 case SPU::R32: return 32;
85 case SPU::R33: return 33;
86 case SPU::R34: return 34;
87 case SPU::R35: return 35;
88 case SPU::R36: return 36;
89 case SPU::R37: return 37;
90 case SPU::R38: return 38;
91 case SPU::R39: return 39;
92 case SPU::R40: return 40;
93 case SPU::R41: return 41;
94 case SPU::R42: return 42;
95 case SPU::R43: return 43;
96 case SPU::R44: return 44;
97 case SPU::R45: return 45;
98 case SPU::R46: return 46;
99 case SPU::R47: return 47;
100 case SPU::R48: return 48;
101 case SPU::R49: return 49;
102 case SPU::R50: return 50;
103 case SPU::R51: return 51;
104 case SPU::R52: return 52;
105 case SPU::R53: return 53;
106 case SPU::R54: return 54;
107 case SPU::R55: return 55;
108 case SPU::R56: return 56;
109 case SPU::R57: return 57;
110 case SPU::R58: return 58;
111 case SPU::R59: return 59;
112 case SPU::R60: return 60;
113 case SPU::R61: return 61;
114 case SPU::R62: return 62;
115 case SPU::R63: return 63;
116 case SPU::R64: return 64;
117 case SPU::R65: return 65;
118 case SPU::R66: return 66;
119 case SPU::R67: return 67;
120 case SPU::R68: return 68;
121 case SPU::R69: return 69;
122 case SPU::R70: return 70;
123 case SPU::R71: return 71;
124 case SPU::R72: return 72;
125 case SPU::R73: return 73;
126 case SPU::R74: return 74;
127 case SPU::R75: return 75;
128 case SPU::R76: return 76;
129 case SPU::R77: return 77;
130 case SPU::R78: return 78;
131 case SPU::R79: return 79;
132 case SPU::R80: return 80;
133 case SPU::R81: return 81;
134 case SPU::R82: return 82;
135 case SPU::R83: return 83;
136 case SPU::R84: return 84;
137 case SPU::R85: return 85;
138 case SPU::R86: return 86;
139 case SPU::R87: return 87;
140 case SPU::R88: return 88;
141 case SPU::R89: return 89;
142 case SPU::R90: return 90;
143 case SPU::R91: return 91;
144 case SPU::R92: return 92;
145 case SPU::R93: return 93;
146 case SPU::R94: return 94;
147 case SPU::R95: return 95;
148 case SPU::R96: return 96;
149 case SPU::R97: return 97;
150 case SPU::R98: return 98;
151 case SPU::R99: return 99;
152 case SPU::R100: return 100;
153 case SPU::R101: return 101;
154 case SPU::R102: return 102;
155 case SPU::R103: return 103;
156 case SPU::R104: return 104;
157 case SPU::R105: return 105;
158 case SPU::R106: return 106;
159 case SPU::R107: return 107;
160 case SPU::R108: return 108;
161 case SPU::R109: return 109;
162 case SPU::R110: return 110;
163 case SPU::R111: return 111;
164 case SPU::R112: return 112;
165 case SPU::R113: return 113;
166 case SPU::R114: return 114;
167 case SPU::R115: return 115;
168 case SPU::R116: return 116;
169 case SPU::R117: return 117;
170 case SPU::R118: return 118;
171 case SPU::R119: return 119;
172 case SPU::R120: return 120;
173 case SPU::R121: return 121;
174 case SPU::R122: return 122;
175 case SPU::R123: return 123;
176 case SPU::R124: return 124;
177 case SPU::R125: return 125;
178 case SPU::R126: return 126;
179 case SPU::R127: return 127;
181 std::cerr << "Unhandled reg in SPURegisterInfo::getRegisterNumbering!\n";
186 SPURegisterInfo::SPURegisterInfo(const SPUSubtarget &subtarget,
187 const TargetInstrInfo &tii) :
188 SPUGenRegisterInfo(SPU::ADJCALLSTACKDOWN, SPU::ADJCALLSTACKUP),
189 Subtarget(subtarget),
195 SPURegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
196 MachineBasicBlock::iterator MI,
197 unsigned SrcReg, int FrameIdx,
198 const TargetRegisterClass *RC) const
201 if (RC == SPU::GPRCRegisterClass) {
202 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
205 } else if (RC == SPU::R64CRegisterClass) {
206 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
209 } else if (RC == SPU::R64FPRegisterClass) {
210 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
213 } else if (RC == SPU::R32CRegisterClass) {
214 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
217 } else if (RC == SPU::R32FPRegisterClass) {
218 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
221 } else if (RC == SPU::R16CRegisterClass) {
222 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset()) ?
226 assert(0 && "Unknown regclass!");
230 addFrameReference(BuildMI(MBB, MI, TII.get(opc)).addReg(SrcReg), FrameIdx);
233 void SPURegisterInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
234 SmallVectorImpl<MachineOperand> &Addr,
235 const TargetRegisterClass *RC,
236 SmallVectorImpl<MachineInstr*> &NewMIs) const {
237 cerr << "storeRegToAddr() invoked!\n";
240 if (Addr[0].isFrameIndex()) {
241 /* do what storeRegToStackSlot does here */
244 if (RC == SPU::GPRCRegisterClass) {
245 /* Opc = PPC::STW; */
246 } else if (RC == SPU::R16CRegisterClass) {
247 /* Opc = PPC::STD; */
248 } else if (RC == SPU::R32CRegisterClass) {
249 /* Opc = PPC::STFD; */
250 } else if (RC == SPU::R32FPRegisterClass) {
251 /* Opc = PPC::STFD; */
252 } else if (RC == SPU::R64FPRegisterClass) {
253 /* Opc = PPC::STFS; */
254 } else if (RC == SPU::VECREGRegisterClass) {
255 /* Opc = PPC::STVX; */
257 assert(0 && "Unknown regclass!");
260 MachineInstrBuilder MIB = BuildMI(TII.get(Opc))
261 .addReg(SrcReg, false, false, true);
262 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
263 MachineOperand &MO = Addr[i];
265 MIB.addReg(MO.getReg());
266 else if (MO.isImmediate())
267 MIB.addImm(MO.getImmedValue());
269 MIB.addFrameIndex(MO.getFrameIndex());
271 NewMIs.push_back(MIB);
276 SPURegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
277 MachineBasicBlock::iterator MI,
278 unsigned DestReg, int FrameIdx,
279 const TargetRegisterClass *RC) const
282 if (RC == SPU::GPRCRegisterClass) {
283 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
286 } else if (RC == SPU::R64CRegisterClass) {
287 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
290 } else if (RC == SPU::R64FPRegisterClass) {
291 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
294 } else if (RC == SPU::R32CRegisterClass) {
295 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
298 } else if (RC == SPU::R32FPRegisterClass) {
299 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
302 } else if (RC == SPU::R16CRegisterClass) {
303 opc = (FrameIdx < SPUFrameInfo::maxFrameOffset())
307 assert(0 && "Unknown regclass in loadRegFromStackSlot!");
311 addFrameReference(BuildMI(MBB, MI, TII.get(opc)).addReg(DestReg), FrameIdx);
315 \note We are really pessimistic here about what kind of a load we're doing.
317 void SPURegisterInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
318 SmallVectorImpl<MachineOperand> &Addr,
319 const TargetRegisterClass *RC,
320 SmallVectorImpl<MachineInstr*> &NewMIs)
322 cerr << "loadRegToAddr() invoked!\n";
325 if (Addr[0].isFrameIndex()) {
326 /* do what loadRegFromStackSlot does here... */
329 if (RC == SPU::R16CRegisterClass) {
330 /* Opc = PPC::LWZ; */
331 } else if (RC == SPU::R32CRegisterClass) {
333 } else if (RC == SPU::R32FPRegisterClass) {
334 /* Opc = PPC::LFD; */
335 } else if (RC == SPU::R64FPRegisterClass) {
336 /* Opc = PPC::LFS; */
337 } else if (RC == SPU::VECREGRegisterClass) {
338 /* Opc = PPC::LVX; */
339 } else if (RC == SPU::GPRCRegisterClass) {
340 /* Opc = something else! */
342 assert(0 && "Unknown regclass!");
345 MachineInstrBuilder MIB = BuildMI(TII.get(Opc), DestReg);
346 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
347 MachineOperand &MO = Addr[i];
349 MIB.addReg(MO.getReg());
350 else if (MO.isImmediate())
351 MIB.addImm(MO.getImmedValue());
353 MIB.addFrameIndex(MO.getFrameIndex());
355 NewMIs.push_back(MIB);
359 void SPURegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
360 MachineBasicBlock::iterator MI,
361 unsigned DestReg, unsigned SrcReg,
362 const TargetRegisterClass *DestRC,
363 const TargetRegisterClass *SrcRC) const
365 if (DestRC != SrcRC) {
366 cerr << "SPURegisterInfo::copyRegToReg(): DestRC != SrcRC not supported!\n";
370 /* if (DestRC == SPU::R8CRegisterClass) {
371 BuildMI(MBB, MI, TII.get(SPU::ORBIr8), DestReg).addReg(SrcReg).addImm(0);
373 if (DestRC == SPU::R16CRegisterClass) {
374 BuildMI(MBB, MI, TII.get(SPU::ORHIr16), DestReg).addReg(SrcReg).addImm(0);
375 } else if (DestRC == SPU::R32CRegisterClass) {
376 BuildMI(MBB, MI, TII.get(SPU::ORIr32), DestReg).addReg(SrcReg).addImm(0);
377 } else if (DestRC == SPU::R32FPRegisterClass) {
378 BuildMI(MBB, MI, TII.get(SPU::ORIf32), DestReg).addReg(SrcReg).addImm(0);
379 } else if (DestRC == SPU::R64CRegisterClass) {
380 BuildMI(MBB, MI, TII.get(SPU::ORIr64), DestReg).addReg(SrcReg).addImm(0);
381 } else if (DestRC == SPU::R64FPRegisterClass) {
382 BuildMI(MBB, MI, TII.get(SPU::ORIf64), DestReg).addReg(SrcReg).addImm(0);
383 } else if (DestRC == SPU::GPRCRegisterClass) {
384 BuildMI(MBB, MI, TII.get(SPU::ORgprc), DestReg).addReg(SrcReg)
386 } else if (DestRC == SPU::VECREGRegisterClass) {
387 BuildMI(MBB, MI, TII.get(SPU::ORv4i32), DestReg).addReg(SrcReg)
390 std::cerr << "Attempt to copy unknown/unsupported register class!\n";
395 void SPURegisterInfo::reMaterialize(MachineBasicBlock &MBB,
396 MachineBasicBlock::iterator I,
398 const MachineInstr *Orig) const {
399 MachineInstr *MI = Orig->clone();
400 MI->getOperand(0).setReg(DestReg);
404 // SPU's 128-bit registers used for argument passing:
405 static const unsigned SPU_ArgRegs[] = {
406 SPU::R3, SPU::R4, SPU::R5, SPU::R6, SPU::R7, SPU::R8, SPU::R9,
407 SPU::R10, SPU::R11, SPU::R12, SPU::R13, SPU::R14, SPU::R15, SPU::R16,
408 SPU::R17, SPU::R18, SPU::R19, SPU::R20, SPU::R21, SPU::R22, SPU::R23,
409 SPU::R24, SPU::R25, SPU::R26, SPU::R27, SPU::R28, SPU::R29, SPU::R30,
410 SPU::R31, SPU::R32, SPU::R33, SPU::R34, SPU::R35, SPU::R36, SPU::R37,
411 SPU::R38, SPU::R39, SPU::R40, SPU::R41, SPU::R42, SPU::R43, SPU::R44,
412 SPU::R45, SPU::R46, SPU::R47, SPU::R48, SPU::R49, SPU::R50, SPU::R51,
413 SPU::R52, SPU::R53, SPU::R54, SPU::R55, SPU::R56, SPU::R57, SPU::R58,
414 SPU::R59, SPU::R60, SPU::R61, SPU::R62, SPU::R63, SPU::R64, SPU::R65,
415 SPU::R66, SPU::R67, SPU::R68, SPU::R69, SPU::R70, SPU::R71, SPU::R72,
416 SPU::R73, SPU::R74, SPU::R75, SPU::R76, SPU::R77, SPU::R78, SPU::R79
420 SPURegisterInfo::getArgRegs()
426 SPURegisterInfo::getNumArgRegs()
428 return sizeof(SPU_ArgRegs) / sizeof(SPU_ArgRegs[0]);
432 SPURegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const
434 // Cell ABI calling convention
435 static const unsigned SPU_CalleeSaveRegs[] = {
436 SPU::R80, SPU::R81, SPU::R82, SPU::R83,
437 SPU::R84, SPU::R85, SPU::R86, SPU::R87,
438 SPU::R88, SPU::R89, SPU::R90, SPU::R91,
439 SPU::R92, SPU::R93, SPU::R94, SPU::R95,
440 SPU::R96, SPU::R97, SPU::R98, SPU::R99,
441 SPU::R100, SPU::R101, SPU::R102, SPU::R103,
442 SPU::R104, SPU::R105, SPU::R106, SPU::R107,
443 SPU::R108, SPU::R109, SPU::R110, SPU::R111,
444 SPU::R112, SPU::R113, SPU::R114, SPU::R115,
445 SPU::R116, SPU::R117, SPU::R118, SPU::R119,
446 SPU::R120, SPU::R121, SPU::R122, SPU::R123,
447 SPU::R124, SPU::R125, SPU::R126, SPU::R127,
448 SPU::R2, /* environment pointer */
449 SPU::R1, /* stack pointer */
450 SPU::R0, /* link register */
454 return SPU_CalleeSaveRegs;
457 const TargetRegisterClass* const*
458 SPURegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const
460 // Cell ABI Calling Convention
461 static const TargetRegisterClass * const SPU_CalleeSaveRegClasses[] = {
462 &SPU::GPRCRegClass, &SPU::GPRCRegClass, &SPU::GPRCRegClass,
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, /* environment pointer */
479 &SPU::GPRCRegClass, /* stack pointer */
480 &SPU::GPRCRegClass, /* link register */
484 return SPU_CalleeSaveRegClasses;
488 R0 (link register), R1 (stack pointer) and R2 (environment pointer -- this is
489 generally unused) are the Cell's reserved registers
491 BitVector SPURegisterInfo::getReservedRegs(const MachineFunction &MF) const {
492 BitVector Reserved(getNumRegs());
493 Reserved.set(SPU::R0); // LR
494 Reserved.set(SPU::R1); // SP
495 Reserved.set(SPU::R2); // environment pointer
499 /// foldMemoryOperand - SPU, like PPC, can only fold spills into
500 /// copy instructions, turning them into load/store instructions.
502 SPURegisterInfo::foldMemoryOperand(MachineInstr *MI, unsigned OpNum,
503 int FrameIndex) const
505 #if SOMEDAY_SCOTT_LOOKS_AT_ME_AGAIN
506 unsigned Opc = MI->getOpcode();
507 MachineInstr *NewMI = 0;
509 if ((Opc == SPU::ORr32
510 || Opc == SPU::ORv4i32)
511 && MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
512 if (OpNum == 0) { // move -> store
513 unsigned InReg = MI->getOperand(1).getReg();
514 if (FrameIndex < SPUFrameInfo::maxFrameOffset()) {
515 NewMI = addFrameReference(BuildMI(TII.get(SPU::STQDr32)).addReg(InReg),
518 } else { // move -> load
519 unsigned OutReg = MI->getOperand(0).getReg();
520 Opc = (FrameIndex < SPUFrameInfo::maxFrameOffset()) ? SPU::STQDr32 : SPU::STQXr32;
521 NewMI = addFrameReference(BuildMI(TII.get(Opc), OutReg), FrameIndex);
526 NewMI->copyKillDeadInfo(MI);
534 /// General-purpose load/store fold to operand code
536 SPURegisterInfo::foldMemoryOperand(MachineInstr *MI, unsigned OpNum,
537 MachineInstr *LoadMI) const
542 //===----------------------------------------------------------------------===//
543 // Stack Frame Processing methods
544 //===----------------------------------------------------------------------===//
546 // needsFP - Return true if the specified function should have a dedicated frame
547 // pointer register. This is true if the function has variable sized allocas or
548 // if frame pointer elimination is disabled.
550 static bool needsFP(const MachineFunction &MF) {
551 const MachineFrameInfo *MFI = MF.getFrameInfo();
552 return NoFramePointerElim || MFI->hasVarSizedObjects();
555 //--------------------------------------------------------------------------
556 // hasFP - Return true if the specified function actually has a dedicated frame
557 // pointer register. This is true if the function needs a frame pointer and has
558 // a non-zero stack size.
560 SPURegisterInfo::hasFP(const MachineFunction &MF) const {
561 const MachineFrameInfo *MFI = MF.getFrameInfo();
562 return MFI->getStackSize() && needsFP(MF);
565 //--------------------------------------------------------------------------
567 SPURegisterInfo::eliminateCallFramePseudoInstr(MachineFunction &MF,
568 MachineBasicBlock &MBB,
569 MachineBasicBlock::iterator I)
572 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
577 SPURegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
578 RegScavenger *RS) const
580 assert(SPAdj == 0 && "Unexpected SP adjacency == 0");
583 MachineInstr &MI = *II;
584 MachineBasicBlock &MBB = *MI.getParent();
585 MachineFunction &MF = *MBB.getParent();
586 MachineFrameInfo *MFI = MF.getFrameInfo();
588 while (!MI.getOperand(i).isFrameIndex()) {
590 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
593 MachineOperand &SPOp = MI.getOperand(i);
594 int FrameIndex = SPOp.getFrameIndex();
596 // Now add the frame object offset to the offset from r1.
597 int Offset = MFI->getObjectOffset(FrameIndex);
599 // Most instructions, except for generated FrameIndex additions using AIr32,
600 // have the immediate in operand 1. AIr32, in this case, has the immediate
602 unsigned OpNo = (MI.getOpcode() != SPU::AIr32 ? 1 : 2);
603 MachineOperand &MO = MI.getOperand(OpNo);
605 // Offset is biased by $lr's slot at the bottom.
606 Offset += MO.getImmedValue() + MFI->getStackSize()
607 + SPUFrameInfo::minStackSize();
608 assert((Offset & 0xf) == 0
609 && "16-byte alignment violated in SPURegisterInfo::eliminateFrameIndex");
611 // Replace the FrameIndex with base register with $sp (aka $r1)
612 SPOp.ChangeToRegister(SPU::R1, false);
613 if (Offset > SPUFrameInfo::maxFrameOffset()
614 || Offset < SPUFrameInfo::minFrameOffset()) {
615 cerr << "Large stack adjustment ("
617 << ") in SPURegisterInfo::eliminateFrameIndex.";
619 MO.ChangeToImmediate(Offset);
623 /// determineFrameLayout - Determine the size of the frame and maximum call
626 SPURegisterInfo::determineFrameLayout(MachineFunction &MF) const
628 MachineFrameInfo *MFI = MF.getFrameInfo();
630 // Get the number of bytes to allocate from the FrameInfo
631 unsigned FrameSize = MFI->getStackSize();
633 // Get the alignments provided by the target, and the maximum alignment
634 // (if any) of the fixed frame objects.
635 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
636 unsigned Align = std::max(TargetAlign, MFI->getMaxAlignment());
637 assert(isPowerOf2_32(Align) && "Alignment is not power of 2");
638 unsigned AlignMask = Align - 1;
640 // Get the maximum call frame size of all the calls.
641 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
643 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
644 // that allocations will be aligned.
645 if (MFI->hasVarSizedObjects())
646 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
648 // Update maximum call frame size.
649 MFI->setMaxCallFrameSize(maxCallFrameSize);
651 // Include call frame size in total.
652 FrameSize += maxCallFrameSize;
654 // Make sure the frame is aligned.
655 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
657 // Update frame info.
658 MFI->setStackSize(FrameSize);
661 void SPURegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
665 // Save and clear the LR state.
666 SPUFunctionInfo *FI = MF.getInfo<SPUFunctionInfo>();
667 FI->setUsesLR(MF.isPhysRegUsed(LR));
669 // Mark LR and SP unused, since the prolog spills them to stack and
670 // we don't want anyone else to spill them for us.
672 // Also, unless R2 is really used someday, don't spill it automatically.
673 MF.setPhysRegUnused(SPU::R0);
674 MF.setPhysRegUnused(SPU::R1);
675 MF.setPhysRegUnused(SPU::R2);
678 void SPURegisterInfo::emitPrologue(MachineFunction &MF) const
680 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
681 MachineBasicBlock::iterator MBBI = MBB.begin();
682 MachineFrameInfo *MFI = MF.getFrameInfo();
683 MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
685 // Prepare for debug frame info.
686 bool hasDebugInfo = MMI && MMI->hasDebugInfo();
687 unsigned FrameLabelId = 0;
689 // Move MBBI back to the beginning of the function.
692 // Work out frame sizes.
693 determineFrameLayout(MF);
694 int FrameSize = MFI->getStackSize();
696 assert((FrameSize & 0xf) == 0
697 && "SPURegisterInfo::emitPrologue: FrameSize not aligned");
700 FrameSize = -(FrameSize + SPUFrameInfo::minStackSize());
702 // Mark effective beginning of when frame pointer becomes valid.
703 FrameLabelId = MMI->NextLabelID();
704 BuildMI(MBB, MBBI, TII.get(ISD::LABEL)).addImm(FrameLabelId);
707 // Adjust stack pointer, spilling $lr -> 16($sp) and $sp -> -FrameSize($sp)
709 BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R0).addImm(16)
711 if (isS10Constant(FrameSize)) {
712 // Spill $sp to adjusted $sp
713 BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R1).addImm(FrameSize)
715 // Adjust $sp by required amout
716 BuildMI(MBB, MBBI, TII.get(SPU::AIr32), SPU::R1).addReg(SPU::R1)
718 } else if (FrameSize <= (1 << 16) - 1 && FrameSize >= -(1 << 16)) {
719 // Frame size can be loaded into ILr32n, so temporarily spill $r2 and use
720 // $r2 to adjust $sp:
721 BuildMI(MBB, MBBI, TII.get(SPU::STQDr128), SPU::R2)
724 BuildMI(MBB, MBBI, TII.get(SPU::ILr32), SPU::R2)
726 BuildMI(MBB, MBBI, TII.get(SPU::STQDr32), SPU::R1)
729 BuildMI(MBB, MBBI, TII.get(SPU::Ar32), SPU::R1)
732 BuildMI(MBB, MBBI, TII.get(SPU::SFIr32), SPU::R2)
735 BuildMI(MBB, MBBI, TII.get(SPU::LQXr128), SPU::R2)
739 cerr << "Unhandled frame size: " << FrameSize << "\n";
744 std::vector<MachineMove> &Moves = MMI->getFrameMoves();
746 // Show update of SP.
747 MachineLocation SPDst(MachineLocation::VirtualFP);
748 MachineLocation SPSrc(MachineLocation::VirtualFP, -FrameSize);
749 Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
751 // Add callee saved registers to move list.
752 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
753 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
754 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
755 unsigned Reg = CSI[I].getReg();
756 if (Reg == SPU::R0) continue;
757 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
758 MachineLocation CSSrc(Reg);
759 Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
762 // Mark effective beginning of when frame pointer is ready.
763 unsigned ReadyLabelId = MMI->NextLabelID();
764 BuildMI(MBB, MBBI, TII.get(ISD::LABEL)).addImm(ReadyLabelId);
766 MachineLocation FPDst(SPU::R1);
767 MachineLocation FPSrc(MachineLocation::VirtualFP);
768 Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
771 // This is a leaf function -- insert a branch hint iff there are
772 // sufficient number instructions in the basic block. Note that
773 // this is just a best guess based on the basic block's size.
774 if (MBB.size() >= (unsigned) SPUFrameInfo::branchHintPenalty()) {
775 MachineBasicBlock::iterator MBBI = prior(MBB.end());
776 // Insert terminator label
777 unsigned BranchLabelId = MMI->NextLabelID();
778 BuildMI(MBB, MBBI, TII.get(SPU::LABEL)).addImm(BranchLabelId);
784 SPURegisterInfo::emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
786 MachineBasicBlock::iterator MBBI = prior(MBB.end());
787 const MachineFrameInfo *MFI = MF.getFrameInfo();
788 int FrameSize = MFI->getStackSize();
789 int LinkSlotOffset = SPUFrameInfo::stackSlotSize();
791 assert(MBBI->getOpcode() == SPU::RET &&
792 "Can only insert epilog into returning blocks");
793 assert((FrameSize & 0xf) == 0
794 && "SPURegisterInfo::emitEpilogue: FrameSize not aligned");
796 FrameSize = FrameSize + SPUFrameInfo::minStackSize();
797 if (isS10Constant(FrameSize + LinkSlotOffset)) {
798 // Reload $lr, adjust $sp by required amount
799 // Note: We do this to slightly improve dual issue -- not by much, but it
800 // is an opportunity for dual issue.
801 BuildMI(MBB, MBBI, TII.get(SPU::LQDr128), SPU::R0)
802 .addImm(FrameSize + LinkSlotOffset)
804 BuildMI(MBB, MBBI, TII.get(SPU::AIr32), SPU::R1)
807 } else if (FrameSize <= (1 << 16) - 1 && FrameSize >= -(1 << 16)) {
808 // Frame size can be loaded into ILr32n, so temporarily spill $r2 and use
809 // $r2 to adjust $sp:
810 BuildMI(MBB, MBBI, TII.get(SPU::STQDr128), SPU::R2)
813 BuildMI(MBB, MBBI, TII.get(SPU::ILr32), SPU::R2)
815 BuildMI(MBB, MBBI, TII.get(SPU::Ar32), SPU::R1)
818 BuildMI(MBB, MBBI, TII.get(SPU::LQDr128), SPU::R0)
821 BuildMI(MBB, MBBI, TII.get(SPU::SFIr32), SPU::R2).
824 BuildMI(MBB, MBBI, TII.get(SPU::LQXr128), SPU::R2)
828 cerr << "Unhandled frame size: " << FrameSize << "\n";
835 SPURegisterInfo::getRARegister() const
841 SPURegisterInfo::getFrameRegister(MachineFunction &MF) const
847 SPURegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const
849 // Initial state of the frame pointer is R1.
850 MachineLocation Dst(MachineLocation::VirtualFP);
851 MachineLocation Src(SPU::R1, 0);
852 Moves.push_back(MachineMove(0, Dst, Src));
857 SPURegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
858 // FIXME: Most probably dwarf numbers differs for Linux and Darwin
859 return SPUGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
862 #include "SPUGenRegisterInfo.inc"