1 //===- SPUInstrInfo.cpp - Cell SPU Instruction Information ----------------===//
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 Cell SPU implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "SPURegisterNames.h"
15 #include "SPUInstrInfo.h"
16 #include "SPUInstrBuilder.h"
17 #include "SPUTargetMachine.h"
18 #include "SPUGenInstrInfo.inc"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/Support/Streams.h"
21 #include "llvm/Support/Debug.h"
26 //! Predicate for an unconditional branch instruction
27 inline bool isUncondBranch(const MachineInstr *I) {
28 unsigned opc = I->getOpcode();
30 return (opc == SPU::BR
35 //! Predicate for a conditional branch instruction
36 inline bool isCondBranch(const MachineInstr *I) {
37 unsigned opc = I->getOpcode();
39 return (opc == SPU::BRNZr32
40 || opc == SPU::BRNZv4i32
42 || opc == SPU::BRZv4i32
43 || opc == SPU::BRHNZr16
44 || opc == SPU::BRHNZv8i16
45 || opc == SPU::BRHZr16
46 || opc == SPU::BRHZv8i16);
50 SPUInstrInfo::SPUInstrInfo(SPUTargetMachine &tm)
51 : TargetInstrInfoImpl(SPUInsts, sizeof(SPUInsts)/sizeof(SPUInsts[0])),
53 RI(*TM.getSubtargetImpl(), *this)
56 /// getPointerRegClass - Return the register class to use to hold pointers.
57 /// This is used for addressing modes.
58 const TargetRegisterClass *
59 SPUInstrInfo::getPointerRegClass() const
61 return &SPU::R32CRegClass;
65 SPUInstrInfo::isMoveInstr(const MachineInstr& MI,
67 unsigned& destReg) const {
68 // Primarily, ORI and OR are generated by copyRegToReg. But, there are other
69 // cases where we can safely say that what's being done is really a move
70 // (see how PowerPC does this -- it's the model for this code too.)
71 switch (MI.getOpcode()) {
86 assert(MI.getNumOperands() == 3 &&
87 MI.getOperand(0).isReg() &&
88 MI.getOperand(1).isReg() &&
89 MI.getOperand(2).isImm() &&
90 "invalid SPU ORI/ORHI/ORBI/AHI/AI/SFI/SFHI instruction!");
91 if (MI.getOperand(2).getImm() == 0) {
92 sourceReg = MI.getOperand(1).getReg();
93 destReg = MI.getOperand(0).getReg();
98 assert(MI.getNumOperands() == 3 &&
99 "wrong number of operands to AIr32");
100 if (MI.getOperand(0).isReg() &&
101 MI.getOperand(1).isReg() &&
102 (MI.getOperand(2).isImm() &&
103 MI.getOperand(2).getImm() == 0)) {
104 sourceReg = MI.getOperand(1).getReg();
105 destReg = MI.getOperand(0).getReg();
122 case SPU::ORv16i8_i8:
123 case SPU::ORv8i16_i16:
124 case SPU::ORv4i32_i32:
125 case SPU::ORv2i64_i64:
126 case SPU::ORv4f32_f32:
127 case SPU::ORv2f64_f64:
128 case SPU::ORi8_v16i8:
129 case SPU::ORi16_v8i16:
130 case SPU::ORi32_v4i32:
131 case SPU::ORi64_v2i64:
132 case SPU::ORf32_v4f32:
133 case SPU::ORf64_v2f64: {
134 assert(MI.getNumOperands() == 2 &&
135 MI.getOperand(0).isReg() &&
136 MI.getOperand(1).isReg() &&
137 "invalid SPU OR<type>_<vec> or LR instruction!");
138 if (MI.getOperand(0).getReg() == MI.getOperand(1).getReg()) {
139 sourceReg = MI.getOperand(0).getReg();
140 destReg = MI.getOperand(0).getReg();
155 assert(MI.getNumOperands() == 3 &&
156 MI.getOperand(0).isReg() &&
157 MI.getOperand(1).isReg() &&
158 MI.getOperand(2).isReg() &&
159 "invalid SPU OR(vec|r32|r64|gprc) instruction!");
160 if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
161 sourceReg = MI.getOperand(1).getReg();
162 destReg = MI.getOperand(0).getReg();
172 SPUInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
173 int &FrameIndex) const {
174 switch (MI->getOpcode()) {
185 const MachineOperand MOp1 = MI->getOperand(1);
186 const MachineOperand MOp2 = MI->getOperand(2);
187 if (MOp1.isImm() && MOp2.isFI()) {
188 FrameIndex = MOp2.getIndex();
189 return MI->getOperand(0).getReg();
198 SPUInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
199 int &FrameIndex) const {
200 switch (MI->getOpcode()) {
212 const MachineOperand MOp1 = MI->getOperand(1);
213 const MachineOperand MOp2 = MI->getOperand(2);
214 if (MOp1.isImm() && MOp2.isFI()) {
215 FrameIndex = MOp2.getIndex();
216 return MI->getOperand(0).getReg();
224 bool SPUInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
225 MachineBasicBlock::iterator MI,
226 unsigned DestReg, unsigned SrcReg,
227 const TargetRegisterClass *DestRC,
228 const TargetRegisterClass *SrcRC) const
230 // We support cross register class moves for our aliases, such as R3 in any
231 // reg class to any other reg class containing R3. This is required because
232 // we instruction select bitconvert i64 -> f64 as a noop for example, so our
233 // types have no specific meaning.
235 if (DestRC == SPU::R8CRegisterClass) {
236 BuildMI(MBB, MI, get(SPU::LRr8), DestReg).addReg(SrcReg);
237 } else if (DestRC == SPU::R16CRegisterClass) {
238 BuildMI(MBB, MI, get(SPU::LRr16), DestReg).addReg(SrcReg);
239 } else if (DestRC == SPU::R32CRegisterClass) {
240 BuildMI(MBB, MI, get(SPU::LRr32), DestReg).addReg(SrcReg);
241 } else if (DestRC == SPU::R32FPRegisterClass) {
242 BuildMI(MBB, MI, get(SPU::LRf32), DestReg).addReg(SrcReg);
243 } else if (DestRC == SPU::R64CRegisterClass) {
244 BuildMI(MBB, MI, get(SPU::LRr64), DestReg).addReg(SrcReg);
245 } else if (DestRC == SPU::R64FPRegisterClass) {
246 BuildMI(MBB, MI, get(SPU::LRf64), DestReg).addReg(SrcReg);
247 } else if (DestRC == SPU::GPRCRegisterClass) {
248 BuildMI(MBB, MI, get(SPU::LRr128), DestReg).addReg(SrcReg);
249 } else if (DestRC == SPU::VECREGRegisterClass) {
250 BuildMI(MBB, MI, get(SPU::LRv16i8), DestReg).addReg(SrcReg);
252 // Attempt to copy unknown/unsupported register class!
260 SPUInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
261 MachineBasicBlock::iterator MI,
262 unsigned SrcReg, bool isKill, int FrameIdx,
263 const TargetRegisterClass *RC) const
266 bool isValidFrameIdx = (FrameIdx < SPUFrameInfo::maxFrameOffset());
267 if (RC == SPU::GPRCRegisterClass) {
268 opc = (isValidFrameIdx ? SPU::STQDr128 : SPU::STQXr128);
269 } else if (RC == SPU::R64CRegisterClass) {
270 opc = (isValidFrameIdx ? SPU::STQDr64 : SPU::STQXr64);
271 } else if (RC == SPU::R64FPRegisterClass) {
272 opc = (isValidFrameIdx ? SPU::STQDr64 : SPU::STQXr64);
273 } else if (RC == SPU::R32CRegisterClass) {
274 opc = (isValidFrameIdx ? SPU::STQDr32 : SPU::STQXr32);
275 } else if (RC == SPU::R32FPRegisterClass) {
276 opc = (isValidFrameIdx ? SPU::STQDr32 : SPU::STQXr32);
277 } else if (RC == SPU::R16CRegisterClass) {
278 opc = (isValidFrameIdx ? SPU::STQDr16 : SPU::STQXr16);
279 } else if (RC == SPU::R8CRegisterClass) {
280 opc = (isValidFrameIdx ? SPU::STQDr8 : SPU::STQXr8);
281 } else if (RC == SPU::VECREGRegisterClass) {
282 opc = (isValidFrameIdx) ? SPU::STQDv16i8 : SPU::STQXv16i8;
284 assert(0 && "Unknown regclass!");
288 addFrameReference(BuildMI(MBB, MI, get(opc))
289 .addReg(SrcReg, false, false, isKill), FrameIdx);
292 void SPUInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
294 SmallVectorImpl<MachineOperand> &Addr,
295 const TargetRegisterClass *RC,
296 SmallVectorImpl<MachineInstr*> &NewMIs) const {
297 cerr << "storeRegToAddr() invoked!\n";
300 if (Addr[0].isFI()) {
301 /* do what storeRegToStackSlot does here */
304 if (RC == SPU::GPRCRegisterClass) {
305 /* Opc = PPC::STW; */
306 } else if (RC == SPU::R16CRegisterClass) {
307 /* Opc = PPC::STD; */
308 } else if (RC == SPU::R32CRegisterClass) {
309 /* Opc = PPC::STFD; */
310 } else if (RC == SPU::R32FPRegisterClass) {
311 /* Opc = PPC::STFD; */
312 } else if (RC == SPU::R64FPRegisterClass) {
313 /* Opc = PPC::STFS; */
314 } else if (RC == SPU::VECREGRegisterClass) {
315 /* Opc = PPC::STVX; */
317 assert(0 && "Unknown regclass!");
320 MachineInstrBuilder MIB = BuildMI(MF, get(Opc))
321 .addReg(SrcReg, false, false, isKill);
322 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
323 MachineOperand &MO = Addr[i];
325 MIB.addReg(MO.getReg());
327 MIB.addImm(MO.getImm());
329 MIB.addFrameIndex(MO.getIndex());
331 NewMIs.push_back(MIB);
336 SPUInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
337 MachineBasicBlock::iterator MI,
338 unsigned DestReg, int FrameIdx,
339 const TargetRegisterClass *RC) const
342 bool isValidFrameIdx = (FrameIdx < SPUFrameInfo::maxFrameOffset());
343 if (RC == SPU::GPRCRegisterClass) {
344 opc = (isValidFrameIdx ? SPU::LQDr128 : SPU::LQXr128);
345 } else if (RC == SPU::R64CRegisterClass) {
346 opc = (isValidFrameIdx ? SPU::LQDr64 : SPU::LQXr64);
347 } else if (RC == SPU::R64FPRegisterClass) {
348 opc = (isValidFrameIdx ? SPU::LQDr64 : SPU::LQXr64);
349 } else if (RC == SPU::R32CRegisterClass) {
350 opc = (isValidFrameIdx ? SPU::LQDr32 : SPU::LQXr32);
351 } else if (RC == SPU::R32FPRegisterClass) {
352 opc = (isValidFrameIdx ? SPU::LQDr32 : SPU::LQXr32);
353 } else if (RC == SPU::R16CRegisterClass) {
354 opc = (isValidFrameIdx ? SPU::LQDr16 : SPU::LQXr16);
355 } else if (RC == SPU::R8CRegisterClass) {
356 opc = (isValidFrameIdx ? SPU::LQDr8 : SPU::LQXr8);
357 } else if (RC == SPU::VECREGRegisterClass) {
358 opc = (isValidFrameIdx) ? SPU::LQDv16i8 : SPU::LQXv16i8;
360 assert(0 && "Unknown regclass in loadRegFromStackSlot!");
364 addFrameReference(BuildMI(MBB, MI, get(opc)).addReg(DestReg), FrameIdx);
368 \note We are really pessimistic here about what kind of a load we're doing.
370 void SPUInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
371 SmallVectorImpl<MachineOperand> &Addr,
372 const TargetRegisterClass *RC,
373 SmallVectorImpl<MachineInstr*> &NewMIs)
375 cerr << "loadRegToAddr() invoked!\n";
378 if (Addr[0].isFI()) {
379 /* do what loadRegFromStackSlot does here... */
382 if (RC == SPU::R8CRegisterClass) {
383 /* do brilliance here */
384 } else if (RC == SPU::R16CRegisterClass) {
385 /* Opc = PPC::LWZ; */
386 } else if (RC == SPU::R32CRegisterClass) {
388 } else if (RC == SPU::R32FPRegisterClass) {
389 /* Opc = PPC::LFD; */
390 } else if (RC == SPU::R64FPRegisterClass) {
391 /* Opc = PPC::LFS; */
392 } else if (RC == SPU::VECREGRegisterClass) {
393 /* Opc = PPC::LVX; */
394 } else if (RC == SPU::GPRCRegisterClass) {
395 /* Opc = something else! */
397 assert(0 && "Unknown regclass!");
400 MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
401 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
402 MachineOperand &MO = Addr[i];
404 MIB.addReg(MO.getReg());
406 MIB.addImm(MO.getImm());
408 MIB.addFrameIndex(MO.getIndex());
410 NewMIs.push_back(MIB);
414 //! Return true if the specified load or store can be folded
416 SPUInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
417 const SmallVectorImpl<unsigned> &Ops) const {
418 if (Ops.size() != 1) return false;
420 // Make sure this is a reg-reg copy.
421 unsigned Opc = MI->getOpcode();
434 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg())
442 /// foldMemoryOperand - SPU, like PPC, can only fold spills into
443 /// copy instructions, turning them into load/store instructions.
445 SPUInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
447 const SmallVectorImpl<unsigned> &Ops,
448 int FrameIndex) const
450 if (Ops.size() != 1) return 0;
452 unsigned OpNum = Ops[0];
453 unsigned Opc = MI->getOpcode();
454 MachineInstr *NewMI = 0;
467 if (OpNum == 0) { // move -> store
468 unsigned InReg = MI->getOperand(1).getReg();
469 bool isKill = MI->getOperand(1).isKill();
470 if (FrameIndex < SPUFrameInfo::maxFrameOffset()) {
471 MachineInstrBuilder MIB = BuildMI(MF, get(SPU::STQDr32));
473 MIB.addReg(InReg, false, false, isKill);
474 NewMI = addFrameReference(MIB, FrameIndex);
476 } else { // move -> load
477 unsigned OutReg = MI->getOperand(0).getReg();
478 bool isDead = MI->getOperand(0).isDead();
479 MachineInstrBuilder MIB = BuildMI(MF, get(Opc));
481 MIB.addReg(OutReg, true, false, false, isDead);
482 Opc = (FrameIndex < SPUFrameInfo::maxFrameOffset())
483 ? SPU::STQDr32 : SPU::STQXr32;
484 NewMI = addFrameReference(MIB, FrameIndex);
494 \note This code was kiped from PPC. There may be more branch analysis for
495 CellSPU than what's currently done here.
498 SPUInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
499 MachineBasicBlock *&FBB,
500 SmallVectorImpl<MachineOperand> &Cond) const {
501 // If the block has no terminators, it just falls into the block after it.
502 MachineBasicBlock::iterator I = MBB.end();
503 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
506 // Get the last instruction in the block.
507 MachineInstr *LastInst = I;
509 // If there is only one terminator instruction, process it.
510 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
511 if (isUncondBranch(LastInst)) {
512 TBB = LastInst->getOperand(0).getMBB();
514 } else if (isCondBranch(LastInst)) {
515 // Block ends with fall-through condbranch.
516 TBB = LastInst->getOperand(1).getMBB();
517 DEBUG(cerr << "Pushing LastInst: ");
518 DEBUG(LastInst->dump());
519 Cond.push_back(MachineOperand::CreateImm(LastInst->getOpcode()));
520 Cond.push_back(LastInst->getOperand(0));
523 // Otherwise, don't know what this is.
527 // Get the instruction before it if it's a terminator.
528 MachineInstr *SecondLastInst = I;
530 // If there are three terminators, we don't know what sort of block this is.
531 if (SecondLastInst && I != MBB.begin() &&
532 isUnpredicatedTerminator(--I))
535 // If the block ends with a conditional and unconditional branch, handle it.
536 if (isCondBranch(SecondLastInst) && isUncondBranch(LastInst)) {
537 TBB = SecondLastInst->getOperand(1).getMBB();
538 DEBUG(cerr << "Pushing SecondLastInst: ");
539 DEBUG(SecondLastInst->dump());
540 Cond.push_back(MachineOperand::CreateImm(SecondLastInst->getOpcode()));
541 Cond.push_back(SecondLastInst->getOperand(0));
542 FBB = LastInst->getOperand(0).getMBB();
546 // If the block ends with two unconditional branches, handle it. The second
547 // one is not executed, so remove it.
548 if (isUncondBranch(SecondLastInst) && isUncondBranch(LastInst)) {
549 TBB = SecondLastInst->getOperand(0).getMBB();
551 I->eraseFromParent();
555 // Otherwise, can't handle this.
560 SPUInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
561 MachineBasicBlock::iterator I = MBB.end();
562 if (I == MBB.begin())
565 if (!isCondBranch(I) && !isUncondBranch(I))
568 // Remove the first branch.
569 DEBUG(cerr << "Removing branch: ");
571 I->eraseFromParent();
573 if (I == MBB.begin())
577 if (!(isCondBranch(I) || isUncondBranch(I)))
580 // Remove the second branch.
581 DEBUG(cerr << "Removing second branch: ");
583 I->eraseFromParent();
588 SPUInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
589 MachineBasicBlock *FBB,
590 const SmallVectorImpl<MachineOperand> &Cond) const {
591 // Shouldn't be a fall through.
592 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
593 assert((Cond.size() == 2 || Cond.size() == 0) &&
594 "SPU branch conditions have two components!");
599 // Unconditional branch
600 MachineInstrBuilder MIB = BuildMI(&MBB, get(SPU::BR));
603 DEBUG(cerr << "Inserted one-way uncond branch: ");
604 DEBUG((*MIB).dump());
606 // Conditional branch
607 MachineInstrBuilder MIB = BuildMI(&MBB, get(Cond[0].getImm()));
608 MIB.addReg(Cond[1].getReg()).addMBB(TBB);
610 DEBUG(cerr << "Inserted one-way cond branch: ");
611 DEBUG((*MIB).dump());
615 MachineInstrBuilder MIB = BuildMI(&MBB, get(Cond[0].getImm()));
616 MachineInstrBuilder MIB2 = BuildMI(&MBB, get(SPU::BR));
618 // Two-way Conditional Branch.
619 MIB.addReg(Cond[1].getReg()).addMBB(TBB);
622 DEBUG(cerr << "Inserted conditional branch: ");
623 DEBUG((*MIB).dump());
624 DEBUG(cerr << "part 2: ");
625 DEBUG((*MIB2).dump());
631 SPUInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
632 return (!MBB.empty() && isUncondBranch(&MBB.back()));
634 //! Reverses a branch's condition, returning false on success.
636 SPUInstrInfo::ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond)
638 // Pretty brainless way of inverting the condition, but it works, considering
639 // there are only two conditions...
641 unsigned Opc; //! The incoming opcode
642 unsigned RevCondOpc; //! The reversed condition opcode
644 { SPU::BRNZr32, SPU::BRZr32 },
645 { SPU::BRNZv4i32, SPU::BRZv4i32 },
646 { SPU::BRZr32, SPU::BRNZr32 },
647 { SPU::BRZv4i32, SPU::BRNZv4i32 },
648 { SPU::BRHNZr16, SPU::BRHZr16 },
649 { SPU::BRHNZv8i16, SPU::BRHZv8i16 },
650 { SPU::BRHZr16, SPU::BRHNZr16 },
651 { SPU::BRHZv8i16, SPU::BRHNZv8i16 }
654 unsigned Opc = unsigned(Cond[0].getImm());
655 // Pretty dull mapping between the two conditions that SPU can generate:
656 for (int i = sizeof(revconds)/sizeof(revconds[0]); i >= 0; --i) {
657 if (revconds[i].Opc == Opc) {
658 Cond[0].setImm(revconds[i].RevCondOpc);