1 //===-- SystemZInstrInfo.cpp - SystemZ 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 SystemZ implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "SystemZInstrInfo.h"
15 #include "SystemZInstrBuilder.h"
16 #include "SystemZTargetMachine.h"
17 #include "llvm/CodeGen/LiveVariables.h"
18 #include "llvm/CodeGen/MachineRegisterInfo.h"
22 #define GET_INSTRINFO_CTOR_DTOR
23 #define GET_INSTRMAP_INFO
24 #include "SystemZGenInstrInfo.inc"
26 // Return a mask with Count low bits set.
27 static uint64_t allOnes(unsigned int Count) {
28 return Count == 0 ? 0 : (uint64_t(1) << (Count - 1) << 1) - 1;
31 // Reg should be a 32-bit GPR. Return true if it is a high register rather
32 // than a low register.
33 static bool isHighReg(unsigned int Reg) {
34 if (SystemZ::GRH32BitRegClass.contains(Reg))
36 assert(SystemZ::GR32BitRegClass.contains(Reg) && "Invalid GRX32");
40 // Pin the vtable to this file.
41 void SystemZInstrInfo::anchor() {}
43 SystemZInstrInfo::SystemZInstrInfo(SystemZSubtarget &sti)
44 : SystemZGenInstrInfo(SystemZ::ADJCALLSTACKDOWN, SystemZ::ADJCALLSTACKUP),
48 // MI is a 128-bit load or store. Split it into two 64-bit loads or stores,
49 // each having the opcode given by NewOpcode.
50 void SystemZInstrInfo::splitMove(MachineBasicBlock::iterator MI,
51 unsigned NewOpcode) const {
52 MachineBasicBlock *MBB = MI->getParent();
53 MachineFunction &MF = *MBB->getParent();
55 // Get two load or store instructions. Use the original instruction for one
56 // of them (arbitrarily the second here) and create a clone for the other.
57 MachineInstr *EarlierMI = MF.CloneMachineInstr(MI);
58 MBB->insert(MI, EarlierMI);
60 // Set up the two 64-bit registers.
61 MachineOperand &HighRegOp = EarlierMI->getOperand(0);
62 MachineOperand &LowRegOp = MI->getOperand(0);
63 HighRegOp.setReg(RI.getSubReg(HighRegOp.getReg(), SystemZ::subreg_h64));
64 LowRegOp.setReg(RI.getSubReg(LowRegOp.getReg(), SystemZ::subreg_l64));
66 // The address in the first (high) instruction is already correct.
67 // Adjust the offset in the second (low) instruction.
68 MachineOperand &HighOffsetOp = EarlierMI->getOperand(2);
69 MachineOperand &LowOffsetOp = MI->getOperand(2);
70 LowOffsetOp.setImm(LowOffsetOp.getImm() + 8);
72 // Clear the kill flags for the base and index registers in the first
74 EarlierMI->getOperand(1).setIsKill(false);
75 EarlierMI->getOperand(3).setIsKill(false);
78 unsigned HighOpcode = getOpcodeForOffset(NewOpcode, HighOffsetOp.getImm());
79 unsigned LowOpcode = getOpcodeForOffset(NewOpcode, LowOffsetOp.getImm());
80 assert(HighOpcode && LowOpcode && "Both offsets should be in range");
82 EarlierMI->setDesc(get(HighOpcode));
83 MI->setDesc(get(LowOpcode));
86 // Split ADJDYNALLOC instruction MI.
87 void SystemZInstrInfo::splitAdjDynAlloc(MachineBasicBlock::iterator MI) const {
88 MachineBasicBlock *MBB = MI->getParent();
89 MachineFunction &MF = *MBB->getParent();
90 MachineFrameInfo *MFFrame = MF.getFrameInfo();
91 MachineOperand &OffsetMO = MI->getOperand(2);
93 uint64_t Offset = (MFFrame->getMaxCallFrameSize() +
94 SystemZMC::CallFrameSize +
96 unsigned NewOpcode = getOpcodeForOffset(SystemZ::LA, Offset);
97 assert(NewOpcode && "No support for huge argument lists yet");
98 MI->setDesc(get(NewOpcode));
99 OffsetMO.setImm(Offset);
102 // MI is an RI-style pseudo instruction. Replace it with LowOpcode
103 // if the first operand is a low GR32 and HighOpcode if the first operand
104 // is a high GR32. ConvertHigh is true if LowOpcode takes a signed operand
105 // and HighOpcode takes an unsigned 32-bit operand. In those cases,
106 // MI has the same kind of operand as LowOpcode, so needs to be converted
107 // if HighOpcode is used.
108 void SystemZInstrInfo::expandRIPseudo(MachineInstr *MI, unsigned LowOpcode,
110 bool ConvertHigh) const {
111 unsigned Reg = MI->getOperand(0).getReg();
112 bool IsHigh = isHighReg(Reg);
113 MI->setDesc(get(IsHigh ? HighOpcode : LowOpcode));
114 if (IsHigh && ConvertHigh)
115 MI->getOperand(1).setImm(uint32_t(MI->getOperand(1).getImm()));
118 // MI is a three-operand RIE-style pseudo instruction. Replace it with
119 // LowOpcodeK if the registers are both low GR32s, otherwise use a move
120 // followed by HighOpcode or LowOpcode, depending on whether the target
121 // is a high or low GR32.
122 void SystemZInstrInfo::expandRIEPseudo(MachineInstr *MI, unsigned LowOpcode,
124 unsigned HighOpcode) const {
125 unsigned DestReg = MI->getOperand(0).getReg();
126 unsigned SrcReg = MI->getOperand(1).getReg();
127 bool DestIsHigh = isHighReg(DestReg);
128 bool SrcIsHigh = isHighReg(SrcReg);
129 if (!DestIsHigh && !SrcIsHigh)
130 MI->setDesc(get(LowOpcodeK));
132 emitGRX32Move(*MI->getParent(), MI, MI->getDebugLoc(),
133 DestReg, SrcReg, SystemZ::LR, 32,
134 MI->getOperand(1).isKill());
135 MI->setDesc(get(DestIsHigh ? HighOpcode : LowOpcode));
136 MI->getOperand(1).setReg(DestReg);
137 MI->tieOperands(0, 1);
141 // MI is an RXY-style pseudo instruction. Replace it with LowOpcode
142 // if the first operand is a low GR32 and HighOpcode if the first operand
144 void SystemZInstrInfo::expandRXYPseudo(MachineInstr *MI, unsigned LowOpcode,
145 unsigned HighOpcode) const {
146 unsigned Reg = MI->getOperand(0).getReg();
147 unsigned Opcode = getOpcodeForOffset(isHighReg(Reg) ? HighOpcode : LowOpcode,
148 MI->getOperand(2).getImm());
149 MI->setDesc(get(Opcode));
152 // MI is an RR-style pseudo instruction that zero-extends the low Size bits
153 // of one GRX32 into another. Replace it with LowOpcode if both operands
154 // are low registers, otherwise use RISB[LH]G.
155 void SystemZInstrInfo::expandZExtPseudo(MachineInstr *MI, unsigned LowOpcode,
156 unsigned Size) const {
157 emitGRX32Move(*MI->getParent(), MI, MI->getDebugLoc(),
158 MI->getOperand(0).getReg(), MI->getOperand(1).getReg(),
159 LowOpcode, Size, MI->getOperand(1).isKill());
160 MI->eraseFromParent();
163 // Emit a zero-extending move from 32-bit GPR SrcReg to 32-bit GPR
164 // DestReg before MBBI in MBB. Use LowLowOpcode when both DestReg and SrcReg
165 // are low registers, otherwise use RISB[LH]G. Size is the number of bits
166 // taken from the low end of SrcReg (8 for LLCR, 16 for LLHR and 32 for LR).
167 // KillSrc is true if this move is the last use of SrcReg.
168 void SystemZInstrInfo::emitGRX32Move(MachineBasicBlock &MBB,
169 MachineBasicBlock::iterator MBBI,
170 DebugLoc DL, unsigned DestReg,
171 unsigned SrcReg, unsigned LowLowOpcode,
172 unsigned Size, bool KillSrc) const {
174 bool DestIsHigh = isHighReg(DestReg);
175 bool SrcIsHigh = isHighReg(SrcReg);
176 if (DestIsHigh && SrcIsHigh)
177 Opcode = SystemZ::RISBHH;
178 else if (DestIsHigh && !SrcIsHigh)
179 Opcode = SystemZ::RISBHL;
180 else if (!DestIsHigh && SrcIsHigh)
181 Opcode = SystemZ::RISBLH;
183 BuildMI(MBB, MBBI, DL, get(LowLowOpcode), DestReg)
184 .addReg(SrcReg, getKillRegState(KillSrc));
187 unsigned Rotate = (DestIsHigh != SrcIsHigh ? 32 : 0);
188 BuildMI(MBB, MBBI, DL, get(Opcode), DestReg)
189 .addReg(DestReg, RegState::Undef)
190 .addReg(SrcReg, getKillRegState(KillSrc))
191 .addImm(32 - Size).addImm(128 + 31).addImm(Rotate);
194 // If MI is a simple load or store for a frame object, return the register
195 // it loads or stores and set FrameIndex to the index of the frame object.
196 // Return 0 otherwise.
198 // Flag is SimpleBDXLoad for loads and SimpleBDXStore for stores.
199 static int isSimpleMove(const MachineInstr *MI, int &FrameIndex,
201 const MCInstrDesc &MCID = MI->getDesc();
202 if ((MCID.TSFlags & Flag) &&
203 MI->getOperand(1).isFI() &&
204 MI->getOperand(2).getImm() == 0 &&
205 MI->getOperand(3).getReg() == 0) {
206 FrameIndex = MI->getOperand(1).getIndex();
207 return MI->getOperand(0).getReg();
212 unsigned SystemZInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
213 int &FrameIndex) const {
214 return isSimpleMove(MI, FrameIndex, SystemZII::SimpleBDXLoad);
217 unsigned SystemZInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
218 int &FrameIndex) const {
219 return isSimpleMove(MI, FrameIndex, SystemZII::SimpleBDXStore);
222 bool SystemZInstrInfo::isStackSlotCopy(const MachineInstr *MI,
224 int &SrcFrameIndex) const {
225 // Check for MVC 0(Length,FI1),0(FI2)
226 const MachineFrameInfo *MFI = MI->getParent()->getParent()->getFrameInfo();
227 if (MI->getOpcode() != SystemZ::MVC ||
228 !MI->getOperand(0).isFI() ||
229 MI->getOperand(1).getImm() != 0 ||
230 !MI->getOperand(3).isFI() ||
231 MI->getOperand(4).getImm() != 0)
234 // Check that Length covers the full slots.
235 int64_t Length = MI->getOperand(2).getImm();
236 unsigned FI1 = MI->getOperand(0).getIndex();
237 unsigned FI2 = MI->getOperand(3).getIndex();
238 if (MFI->getObjectSize(FI1) != Length ||
239 MFI->getObjectSize(FI2) != Length)
242 DestFrameIndex = FI1;
247 bool SystemZInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
248 MachineBasicBlock *&TBB,
249 MachineBasicBlock *&FBB,
250 SmallVectorImpl<MachineOperand> &Cond,
251 bool AllowModify) const {
252 // Most of the code and comments here are boilerplate.
254 // Start from the bottom of the block and work up, examining the
255 // terminator instructions.
256 MachineBasicBlock::iterator I = MBB.end();
257 while (I != MBB.begin()) {
259 if (I->isDebugValue())
262 // Working from the bottom, when we see a non-terminator instruction, we're
264 if (!isUnpredicatedTerminator(I))
267 // A terminator that isn't a branch can't easily be handled by this
272 // Can't handle indirect branches.
273 SystemZII::Branch Branch(getBranchInfo(I));
274 if (!Branch.Target->isMBB())
277 // Punt on compound branches.
278 if (Branch.Type != SystemZII::BranchNormal)
281 if (Branch.CCMask == SystemZ::CCMASK_ANY) {
282 // Handle unconditional branches.
284 TBB = Branch.Target->getMBB();
288 // If the block has any instructions after a JMP, delete them.
289 while (std::next(I) != MBB.end())
290 std::next(I)->eraseFromParent();
295 // Delete the JMP if it's equivalent to a fall-through.
296 if (MBB.isLayoutSuccessor(Branch.Target->getMBB())) {
298 I->eraseFromParent();
303 // TBB is used to indicate the unconditinal destination.
304 TBB = Branch.Target->getMBB();
308 // Working from the bottom, handle the first conditional branch.
310 // FIXME: add X86-style branch swap
312 TBB = Branch.Target->getMBB();
313 Cond.push_back(MachineOperand::CreateImm(Branch.CCValid));
314 Cond.push_back(MachineOperand::CreateImm(Branch.CCMask));
318 // Handle subsequent conditional branches.
319 assert(Cond.size() == 2 && TBB && "Should have seen a conditional branch");
321 // Only handle the case where all conditional branches branch to the same
323 if (TBB != Branch.Target->getMBB())
326 // If the conditions are the same, we can leave them alone.
327 unsigned OldCCValid = Cond[0].getImm();
328 unsigned OldCCMask = Cond[1].getImm();
329 if (OldCCValid == Branch.CCValid && OldCCMask == Branch.CCMask)
332 // FIXME: Try combining conditions like X86 does. Should be easy on Z!
339 unsigned SystemZInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
340 // Most of the code and comments here are boilerplate.
341 MachineBasicBlock::iterator I = MBB.end();
344 while (I != MBB.begin()) {
346 if (I->isDebugValue())
350 if (!getBranchInfo(I).Target->isMBB())
352 // Remove the branch.
353 I->eraseFromParent();
361 bool SystemZInstrInfo::
362 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
363 assert(Cond.size() == 2 && "Invalid condition");
364 Cond[1].setImm(Cond[1].getImm() ^ Cond[0].getImm());
369 SystemZInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
370 MachineBasicBlock *FBB,
371 ArrayRef<MachineOperand> Cond,
373 // In this function we output 32-bit branches, which should always
374 // have enough range. They can be shortened and relaxed by later code
375 // in the pipeline, if desired.
377 // Shouldn't be a fall through.
378 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
379 assert((Cond.size() == 2 || Cond.size() == 0) &&
380 "SystemZ branch conditions have one component!");
383 // Unconditional branch?
384 assert(!FBB && "Unconditional branch with multiple successors!");
385 BuildMI(&MBB, DL, get(SystemZ::J)).addMBB(TBB);
389 // Conditional branch.
391 unsigned CCValid = Cond[0].getImm();
392 unsigned CCMask = Cond[1].getImm();
393 BuildMI(&MBB, DL, get(SystemZ::BRC))
394 .addImm(CCValid).addImm(CCMask).addMBB(TBB);
398 // Two-way Conditional branch. Insert the second branch.
399 BuildMI(&MBB, DL, get(SystemZ::J)).addMBB(FBB);
405 bool SystemZInstrInfo::analyzeCompare(const MachineInstr *MI,
406 unsigned &SrcReg, unsigned &SrcReg2,
407 int &Mask, int &Value) const {
408 assert(MI->isCompare() && "Caller should have checked for a comparison");
410 if (MI->getNumExplicitOperands() == 2 &&
411 MI->getOperand(0).isReg() &&
412 MI->getOperand(1).isImm()) {
413 SrcReg = MI->getOperand(0).getReg();
415 Value = MI->getOperand(1).getImm();
423 // If Reg is a virtual register, return its definition, otherwise return null.
424 static MachineInstr *getDef(unsigned Reg,
425 const MachineRegisterInfo *MRI) {
426 if (TargetRegisterInfo::isPhysicalRegister(Reg))
428 return MRI->getUniqueVRegDef(Reg);
431 // Return true if MI is a shift of type Opcode by Imm bits.
432 static bool isShift(MachineInstr *MI, unsigned Opcode, int64_t Imm) {
433 return (MI->getOpcode() == Opcode &&
434 !MI->getOperand(2).getReg() &&
435 MI->getOperand(3).getImm() == Imm);
438 // If the destination of MI has no uses, delete it as dead.
439 static void eraseIfDead(MachineInstr *MI, const MachineRegisterInfo *MRI) {
440 if (MRI->use_nodbg_empty(MI->getOperand(0).getReg()))
441 MI->eraseFromParent();
444 // Compare compares SrcReg against zero. Check whether SrcReg contains
445 // the result of an IPM sequence whose input CC survives until Compare,
446 // and whether Compare is therefore redundant. Delete it and return
448 static bool removeIPMBasedCompare(MachineInstr *Compare, unsigned SrcReg,
449 const MachineRegisterInfo *MRI,
450 const TargetRegisterInfo *TRI) {
451 MachineInstr *LGFR = nullptr;
452 MachineInstr *RLL = getDef(SrcReg, MRI);
453 if (RLL && RLL->getOpcode() == SystemZ::LGFR) {
455 RLL = getDef(LGFR->getOperand(1).getReg(), MRI);
457 if (!RLL || !isShift(RLL, SystemZ::RLL, 31))
460 MachineInstr *SRL = getDef(RLL->getOperand(1).getReg(), MRI);
461 if (!SRL || !isShift(SRL, SystemZ::SRL, SystemZ::IPM_CC))
464 MachineInstr *IPM = getDef(SRL->getOperand(1).getReg(), MRI);
465 if (!IPM || IPM->getOpcode() != SystemZ::IPM)
468 // Check that there are no assignments to CC between the IPM and Compare,
469 if (IPM->getParent() != Compare->getParent())
471 MachineBasicBlock::iterator MBBI = IPM, MBBE = Compare;
472 for (++MBBI; MBBI != MBBE; ++MBBI) {
473 MachineInstr *MI = MBBI;
474 if (MI->modifiesRegister(SystemZ::CC, TRI))
478 Compare->eraseFromParent();
480 eraseIfDead(LGFR, MRI);
481 eraseIfDead(RLL, MRI);
482 eraseIfDead(SRL, MRI);
483 eraseIfDead(IPM, MRI);
489 SystemZInstrInfo::optimizeCompareInstr(MachineInstr *Compare,
490 unsigned SrcReg, unsigned SrcReg2,
492 const MachineRegisterInfo *MRI) const {
493 assert(!SrcReg2 && "Only optimizing constant comparisons so far");
494 bool IsLogical = (Compare->getDesc().TSFlags & SystemZII::IsLogical) != 0;
495 return Value == 0 && !IsLogical &&
496 removeIPMBasedCompare(Compare, SrcReg, MRI, &RI);
499 // If Opcode is a move that has a conditional variant, return that variant,
500 // otherwise return 0.
501 static unsigned getConditionalMove(unsigned Opcode) {
503 case SystemZ::LR: return SystemZ::LOCR;
504 case SystemZ::LGR: return SystemZ::LOCGR;
509 bool SystemZInstrInfo::isPredicable(MachineInstr *MI) const {
510 unsigned Opcode = MI->getOpcode();
511 return STI.hasLoadStoreOnCond() && getConditionalMove(Opcode);
514 bool SystemZInstrInfo::
515 isProfitableToIfCvt(MachineBasicBlock &MBB,
516 unsigned NumCycles, unsigned ExtraPredCycles,
517 BranchProbability Probability) const {
518 // For now only convert single instructions.
519 return NumCycles == 1;
522 bool SystemZInstrInfo::
523 isProfitableToIfCvt(MachineBasicBlock &TMBB,
524 unsigned NumCyclesT, unsigned ExtraPredCyclesT,
525 MachineBasicBlock &FMBB,
526 unsigned NumCyclesF, unsigned ExtraPredCyclesF,
527 BranchProbability Probability) const {
528 // For now avoid converting mutually-exclusive cases.
532 bool SystemZInstrInfo::
533 PredicateInstruction(MachineInstr *MI, ArrayRef<MachineOperand> Pred) const {
534 assert(Pred.size() == 2 && "Invalid condition");
535 unsigned CCValid = Pred[0].getImm();
536 unsigned CCMask = Pred[1].getImm();
537 assert(CCMask > 0 && CCMask < 15 && "Invalid predicate");
538 unsigned Opcode = MI->getOpcode();
539 if (STI.hasLoadStoreOnCond()) {
540 if (unsigned CondOpcode = getConditionalMove(Opcode)) {
541 MI->setDesc(get(CondOpcode));
542 MachineInstrBuilder(*MI->getParent()->getParent(), MI)
543 .addImm(CCValid).addImm(CCMask)
544 .addReg(SystemZ::CC, RegState::Implicit);
551 void SystemZInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
552 MachineBasicBlock::iterator MBBI,
553 DebugLoc DL, unsigned DestReg,
554 unsigned SrcReg, bool KillSrc) const {
555 // Split 128-bit GPR moves into two 64-bit moves. This handles ADDR128 too.
556 if (SystemZ::GR128BitRegClass.contains(DestReg, SrcReg)) {
557 copyPhysReg(MBB, MBBI, DL, RI.getSubReg(DestReg, SystemZ::subreg_h64),
558 RI.getSubReg(SrcReg, SystemZ::subreg_h64), KillSrc);
559 copyPhysReg(MBB, MBBI, DL, RI.getSubReg(DestReg, SystemZ::subreg_l64),
560 RI.getSubReg(SrcReg, SystemZ::subreg_l64), KillSrc);
564 if (SystemZ::GRX32BitRegClass.contains(DestReg, SrcReg)) {
565 emitGRX32Move(MBB, MBBI, DL, DestReg, SrcReg, SystemZ::LR, 32, KillSrc);
569 // Everything else needs only one instruction.
571 if (SystemZ::GR64BitRegClass.contains(DestReg, SrcReg))
572 Opcode = SystemZ::LGR;
573 else if (SystemZ::FP32BitRegClass.contains(DestReg, SrcReg))
574 Opcode = SystemZ::LER;
575 else if (SystemZ::FP64BitRegClass.contains(DestReg, SrcReg))
576 Opcode = SystemZ::LDR;
577 else if (SystemZ::FP128BitRegClass.contains(DestReg, SrcReg))
578 Opcode = SystemZ::LXR;
579 else if (SystemZ::VR32BitRegClass.contains(DestReg, SrcReg))
580 Opcode = SystemZ::VLR32;
581 else if (SystemZ::VR64BitRegClass.contains(DestReg, SrcReg))
582 Opcode = SystemZ::VLR64;
583 else if (SystemZ::VR128BitRegClass.contains(DestReg, SrcReg))
584 Opcode = SystemZ::VLR;
586 llvm_unreachable("Impossible reg-to-reg copy");
588 BuildMI(MBB, MBBI, DL, get(Opcode), DestReg)
589 .addReg(SrcReg, getKillRegState(KillSrc));
592 void SystemZInstrInfo::storeRegToStackSlot(
593 MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, unsigned SrcReg,
594 bool isKill, int FrameIdx, const TargetRegisterClass *RC,
595 const TargetRegisterInfo *TRI) const {
596 DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
598 // Callers may expect a single instruction, so keep 128-bit moves
599 // together for now and lower them after register allocation.
600 unsigned LoadOpcode, StoreOpcode;
601 getLoadStoreOpcodes(RC, LoadOpcode, StoreOpcode);
602 addFrameReference(BuildMI(MBB, MBBI, DL, get(StoreOpcode))
603 .addReg(SrcReg, getKillRegState(isKill)),
607 void SystemZInstrInfo::loadRegFromStackSlot(
608 MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, unsigned DestReg,
609 int FrameIdx, const TargetRegisterClass *RC,
610 const TargetRegisterInfo *TRI) const {
611 DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
613 // Callers may expect a single instruction, so keep 128-bit moves
614 // together for now and lower them after register allocation.
615 unsigned LoadOpcode, StoreOpcode;
616 getLoadStoreOpcodes(RC, LoadOpcode, StoreOpcode);
617 addFrameReference(BuildMI(MBB, MBBI, DL, get(LoadOpcode), DestReg),
621 // Return true if MI is a simple load or store with a 12-bit displacement
622 // and no index. Flag is SimpleBDXLoad for loads and SimpleBDXStore for stores.
623 static bool isSimpleBD12Move(const MachineInstr *MI, unsigned Flag) {
624 const MCInstrDesc &MCID = MI->getDesc();
625 return ((MCID.TSFlags & Flag) &&
626 isUInt<12>(MI->getOperand(2).getImm()) &&
627 MI->getOperand(3).getReg() == 0);
632 LogicOp() : RegSize(0), ImmLSB(0), ImmSize(0) {}
633 LogicOp(unsigned regSize, unsigned immLSB, unsigned immSize)
634 : RegSize(regSize), ImmLSB(immLSB), ImmSize(immSize) {}
636 explicit operator bool() const { return RegSize; }
638 unsigned RegSize, ImmLSB, ImmSize;
640 } // end anonymous namespace
642 static LogicOp interpretAndImmediate(unsigned Opcode) {
644 case SystemZ::NILMux: return LogicOp(32, 0, 16);
645 case SystemZ::NIHMux: return LogicOp(32, 16, 16);
646 case SystemZ::NILL64: return LogicOp(64, 0, 16);
647 case SystemZ::NILH64: return LogicOp(64, 16, 16);
648 case SystemZ::NIHL64: return LogicOp(64, 32, 16);
649 case SystemZ::NIHH64: return LogicOp(64, 48, 16);
650 case SystemZ::NIFMux: return LogicOp(32, 0, 32);
651 case SystemZ::NILF64: return LogicOp(64, 0, 32);
652 case SystemZ::NIHF64: return LogicOp(64, 32, 32);
653 default: return LogicOp();
657 // Used to return from convertToThreeAddress after replacing two-address
658 // instruction OldMI with three-address instruction NewMI.
659 static MachineInstr *finishConvertToThreeAddress(MachineInstr *OldMI,
663 unsigned NumOps = OldMI->getNumOperands();
664 for (unsigned I = 1; I < NumOps; ++I) {
665 MachineOperand &Op = OldMI->getOperand(I);
666 if (Op.isReg() && Op.isKill())
667 LV->replaceKillInstruction(Op.getReg(), OldMI, NewMI);
674 SystemZInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
675 MachineBasicBlock::iterator &MBBI,
676 LiveVariables *LV) const {
677 MachineInstr *MI = MBBI;
678 MachineBasicBlock *MBB = MI->getParent();
679 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
681 unsigned Opcode = MI->getOpcode();
682 unsigned NumOps = MI->getNumOperands();
684 // Try to convert something like SLL into SLLK, if supported.
685 // We prefer to keep the two-operand form where possible both
686 // because it tends to be shorter and because some instructions
687 // have memory forms that can be used during spilling.
688 if (STI.hasDistinctOps()) {
689 MachineOperand &Dest = MI->getOperand(0);
690 MachineOperand &Src = MI->getOperand(1);
691 unsigned DestReg = Dest.getReg();
692 unsigned SrcReg = Src.getReg();
693 // AHIMux is only really a three-operand instruction when both operands
694 // are low registers. Try to constrain both operands to be low if
696 if (Opcode == SystemZ::AHIMux &&
697 TargetRegisterInfo::isVirtualRegister(DestReg) &&
698 TargetRegisterInfo::isVirtualRegister(SrcReg) &&
699 MRI.getRegClass(DestReg)->contains(SystemZ::R1L) &&
700 MRI.getRegClass(SrcReg)->contains(SystemZ::R1L)) {
701 MRI.constrainRegClass(DestReg, &SystemZ::GR32BitRegClass);
702 MRI.constrainRegClass(SrcReg, &SystemZ::GR32BitRegClass);
704 int ThreeOperandOpcode = SystemZ::getThreeOperandOpcode(Opcode);
705 if (ThreeOperandOpcode >= 0) {
706 MachineInstrBuilder MIB =
707 BuildMI(*MBB, MBBI, MI->getDebugLoc(), get(ThreeOperandOpcode))
709 // Keep the kill state, but drop the tied flag.
710 MIB.addReg(Src.getReg(), getKillRegState(Src.isKill()), Src.getSubReg());
711 // Keep the remaining operands as-is.
712 for (unsigned I = 2; I < NumOps; ++I)
713 MIB.addOperand(MI->getOperand(I));
714 return finishConvertToThreeAddress(MI, MIB, LV);
718 // Try to convert an AND into an RISBG-type instruction.
719 if (LogicOp And = interpretAndImmediate(Opcode)) {
720 uint64_t Imm = MI->getOperand(2).getImm() << And.ImmLSB;
721 // AND IMMEDIATE leaves the other bits of the register unchanged.
722 Imm |= allOnes(And.RegSize) & ~(allOnes(And.ImmSize) << And.ImmLSB);
724 if (isRxSBGMask(Imm, And.RegSize, Start, End)) {
726 if (And.RegSize == 64) {
727 NewOpcode = SystemZ::RISBG;
728 // Prefer RISBGN if available, since it does not clobber CC.
729 if (STI.hasMiscellaneousExtensions())
730 NewOpcode = SystemZ::RISBGN;
732 NewOpcode = SystemZ::RISBMux;
736 MachineOperand &Dest = MI->getOperand(0);
737 MachineOperand &Src = MI->getOperand(1);
738 MachineInstrBuilder MIB =
739 BuildMI(*MBB, MI, MI->getDebugLoc(), get(NewOpcode))
740 .addOperand(Dest).addReg(0)
741 .addReg(Src.getReg(), getKillRegState(Src.isKill()), Src.getSubReg())
742 .addImm(Start).addImm(End + 128).addImm(0);
743 return finishConvertToThreeAddress(MI, MIB, LV);
749 MachineInstr *SystemZInstrInfo::foldMemoryOperandImpl(
750 MachineFunction &MF, MachineInstr *MI, ArrayRef<unsigned> Ops,
751 MachineBasicBlock::iterator InsertPt, int FrameIndex) const {
752 const MachineFrameInfo *MFI = MF.getFrameInfo();
753 unsigned Size = MFI->getObjectSize(FrameIndex);
754 unsigned Opcode = MI->getOpcode();
756 if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
757 if ((Opcode == SystemZ::LA || Opcode == SystemZ::LAY) &&
758 isInt<8>(MI->getOperand(2).getImm()) &&
759 !MI->getOperand(3).getReg()) {
760 // LA(Y) %reg, CONST(%reg) -> AGSI %mem, CONST
761 return BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
763 .addFrameIndex(FrameIndex)
765 .addImm(MI->getOperand(2).getImm());
770 // All other cases require a single operand.
774 unsigned OpNum = Ops[0];
775 assert(Size == MF.getRegInfo()
776 .getRegClass(MI->getOperand(OpNum).getReg())->getSize() &&
777 "Invalid size combination");
779 if ((Opcode == SystemZ::AHI || Opcode == SystemZ::AGHI) &&
781 isInt<8>(MI->getOperand(2).getImm())) {
782 // A(G)HI %reg, CONST -> A(G)SI %mem, CONST
783 Opcode = (Opcode == SystemZ::AHI ? SystemZ::ASI : SystemZ::AGSI);
784 return BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
786 .addFrameIndex(FrameIndex)
788 .addImm(MI->getOperand(2).getImm());
791 if (Opcode == SystemZ::LGDR || Opcode == SystemZ::LDGR) {
792 bool Op0IsGPR = (Opcode == SystemZ::LGDR);
793 bool Op1IsGPR = (Opcode == SystemZ::LDGR);
794 // If we're spilling the destination of an LDGR or LGDR, store the
795 // source register instead.
797 unsigned StoreOpcode = Op1IsGPR ? SystemZ::STG : SystemZ::STD;
798 return BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
800 .addOperand(MI->getOperand(1))
801 .addFrameIndex(FrameIndex)
805 // If we're spilling the source of an LDGR or LGDR, load the
806 // destination register instead.
808 unsigned LoadOpcode = Op0IsGPR ? SystemZ::LG : SystemZ::LD;
809 unsigned Dest = MI->getOperand(0).getReg();
810 return BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
811 get(LoadOpcode), Dest)
812 .addFrameIndex(FrameIndex)
818 // Look for cases where the source of a simple store or the destination
819 // of a simple load is being spilled. Try to use MVC instead.
821 // Although MVC is in practice a fast choice in these cases, it is still
822 // logically a bytewise copy. This means that we cannot use it if the
823 // load or store is volatile. We also wouldn't be able to use MVC if
824 // the two memories partially overlap, but that case cannot occur here,
825 // because we know that one of the memories is a full frame index.
827 // For performance reasons, we also want to avoid using MVC if the addresses
828 // might be equal. We don't worry about that case here, because spill slot
829 // coloring happens later, and because we have special code to remove
830 // MVCs that turn out to be redundant.
831 if (OpNum == 0 && MI->hasOneMemOperand()) {
832 MachineMemOperand *MMO = *MI->memoperands_begin();
833 if (MMO->getSize() == Size && !MMO->isVolatile()) {
834 // Handle conversion of loads.
835 if (isSimpleBD12Move(MI, SystemZII::SimpleBDXLoad)) {
836 return BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
838 .addFrameIndex(FrameIndex)
841 .addOperand(MI->getOperand(1))
842 .addImm(MI->getOperand(2).getImm())
845 // Handle conversion of stores.
846 if (isSimpleBD12Move(MI, SystemZII::SimpleBDXStore)) {
847 return BuildMI(*InsertPt->getParent(), InsertPt, MI->getDebugLoc(),
849 .addOperand(MI->getOperand(1))
850 .addImm(MI->getOperand(2).getImm())
852 .addFrameIndex(FrameIndex)
859 // If the spilled operand is the final one, try to change <INSN>R
861 int MemOpcode = SystemZ::getMemOpcode(Opcode);
862 if (MemOpcode >= 0) {
863 unsigned NumOps = MI->getNumExplicitOperands();
864 if (OpNum == NumOps - 1) {
865 const MCInstrDesc &MemDesc = get(MemOpcode);
866 uint64_t AccessBytes = SystemZII::getAccessSize(MemDesc.TSFlags);
867 assert(AccessBytes != 0 && "Size of access should be known");
868 assert(AccessBytes <= Size && "Access outside the frame index");
869 uint64_t Offset = Size - AccessBytes;
870 MachineInstrBuilder MIB = BuildMI(*InsertPt->getParent(), InsertPt,
871 MI->getDebugLoc(), get(MemOpcode));
872 for (unsigned I = 0; I < OpNum; ++I)
873 MIB.addOperand(MI->getOperand(I));
874 MIB.addFrameIndex(FrameIndex).addImm(Offset);
875 if (MemDesc.TSFlags & SystemZII::HasIndex)
884 MachineInstr *SystemZInstrInfo::foldMemoryOperandImpl(
885 MachineFunction &MF, MachineInstr *MI, ArrayRef<unsigned> Ops,
886 MachineBasicBlock::iterator InsertPt, MachineInstr *LoadMI) const {
891 SystemZInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
892 switch (MI->getOpcode()) {
894 splitMove(MI, SystemZ::LG);
898 splitMove(MI, SystemZ::STG);
902 splitMove(MI, SystemZ::LD);
906 splitMove(MI, SystemZ::STD);
910 expandRXYPseudo(MI, SystemZ::LB, SystemZ::LBH);
914 expandRXYPseudo(MI, SystemZ::LH, SystemZ::LHH);
917 case SystemZ::LLCRMux:
918 expandZExtPseudo(MI, SystemZ::LLCR, 8);
921 case SystemZ::LLHRMux:
922 expandZExtPseudo(MI, SystemZ::LLHR, 16);
925 case SystemZ::LLCMux:
926 expandRXYPseudo(MI, SystemZ::LLC, SystemZ::LLCH);
929 case SystemZ::LLHMux:
930 expandRXYPseudo(MI, SystemZ::LLH, SystemZ::LLHH);
934 expandRXYPseudo(MI, SystemZ::L, SystemZ::LFH);
937 case SystemZ::STCMux:
938 expandRXYPseudo(MI, SystemZ::STC, SystemZ::STCH);
941 case SystemZ::STHMux:
942 expandRXYPseudo(MI, SystemZ::STH, SystemZ::STHH);
946 expandRXYPseudo(MI, SystemZ::ST, SystemZ::STFH);
949 case SystemZ::LHIMux:
950 expandRIPseudo(MI, SystemZ::LHI, SystemZ::IIHF, true);
953 case SystemZ::IIFMux:
954 expandRIPseudo(MI, SystemZ::IILF, SystemZ::IIHF, false);
957 case SystemZ::IILMux:
958 expandRIPseudo(MI, SystemZ::IILL, SystemZ::IIHL, false);
961 case SystemZ::IIHMux:
962 expandRIPseudo(MI, SystemZ::IILH, SystemZ::IIHH, false);
965 case SystemZ::NIFMux:
966 expandRIPseudo(MI, SystemZ::NILF, SystemZ::NIHF, false);
969 case SystemZ::NILMux:
970 expandRIPseudo(MI, SystemZ::NILL, SystemZ::NIHL, false);
973 case SystemZ::NIHMux:
974 expandRIPseudo(MI, SystemZ::NILH, SystemZ::NIHH, false);
977 case SystemZ::OIFMux:
978 expandRIPseudo(MI, SystemZ::OILF, SystemZ::OIHF, false);
981 case SystemZ::OILMux:
982 expandRIPseudo(MI, SystemZ::OILL, SystemZ::OIHL, false);
985 case SystemZ::OIHMux:
986 expandRIPseudo(MI, SystemZ::OILH, SystemZ::OIHH, false);
989 case SystemZ::XIFMux:
990 expandRIPseudo(MI, SystemZ::XILF, SystemZ::XIHF, false);
993 case SystemZ::TMLMux:
994 expandRIPseudo(MI, SystemZ::TMLL, SystemZ::TMHL, false);
997 case SystemZ::TMHMux:
998 expandRIPseudo(MI, SystemZ::TMLH, SystemZ::TMHH, false);
1001 case SystemZ::AHIMux:
1002 expandRIPseudo(MI, SystemZ::AHI, SystemZ::AIH, false);
1005 case SystemZ::AHIMuxK:
1006 expandRIEPseudo(MI, SystemZ::AHI, SystemZ::AHIK, SystemZ::AIH);
1009 case SystemZ::AFIMux:
1010 expandRIPseudo(MI, SystemZ::AFI, SystemZ::AIH, false);
1013 case SystemZ::CFIMux:
1014 expandRIPseudo(MI, SystemZ::CFI, SystemZ::CIH, false);
1017 case SystemZ::CLFIMux:
1018 expandRIPseudo(MI, SystemZ::CLFI, SystemZ::CLIH, false);
1022 expandRXYPseudo(MI, SystemZ::C, SystemZ::CHF);
1025 case SystemZ::CLMux:
1026 expandRXYPseudo(MI, SystemZ::CL, SystemZ::CLHF);
1029 case SystemZ::RISBMux: {
1030 bool DestIsHigh = isHighReg(MI->getOperand(0).getReg());
1031 bool SrcIsHigh = isHighReg(MI->getOperand(2).getReg());
1032 if (SrcIsHigh == DestIsHigh)
1033 MI->setDesc(get(DestIsHigh ? SystemZ::RISBHH : SystemZ::RISBLL));
1035 MI->setDesc(get(DestIsHigh ? SystemZ::RISBHL : SystemZ::RISBLH));
1036 MI->getOperand(5).setImm(MI->getOperand(5).getImm() ^ 32);
1041 case SystemZ::ADJDYNALLOC:
1042 splitAdjDynAlloc(MI);
1050 uint64_t SystemZInstrInfo::getInstSizeInBytes(const MachineInstr *MI) const {
1051 if (MI->getOpcode() == TargetOpcode::INLINEASM) {
1052 const MachineFunction *MF = MI->getParent()->getParent();
1053 const char *AsmStr = MI->getOperand(0).getSymbolName();
1054 return getInlineAsmLength(AsmStr, *MF->getTarget().getMCAsmInfo());
1056 return MI->getDesc().getSize();
1060 SystemZInstrInfo::getBranchInfo(const MachineInstr *MI) const {
1061 switch (MI->getOpcode()) {
1065 return SystemZII::Branch(SystemZII::BranchNormal, SystemZ::CCMASK_ANY,
1066 SystemZ::CCMASK_ANY, &MI->getOperand(0));
1070 return SystemZII::Branch(SystemZII::BranchNormal,
1071 MI->getOperand(0).getImm(),
1072 MI->getOperand(1).getImm(), &MI->getOperand(2));
1075 return SystemZII::Branch(SystemZII::BranchCT, SystemZ::CCMASK_ICMP,
1076 SystemZ::CCMASK_CMP_NE, &MI->getOperand(2));
1078 case SystemZ::BRCTG:
1079 return SystemZII::Branch(SystemZII::BranchCTG, SystemZ::CCMASK_ICMP,
1080 SystemZ::CCMASK_CMP_NE, &MI->getOperand(2));
1084 return SystemZII::Branch(SystemZII::BranchC, SystemZ::CCMASK_ICMP,
1085 MI->getOperand(2).getImm(), &MI->getOperand(3));
1089 return SystemZII::Branch(SystemZII::BranchCL, SystemZ::CCMASK_ICMP,
1090 MI->getOperand(2).getImm(), &MI->getOperand(3));
1094 return SystemZII::Branch(SystemZII::BranchCG, SystemZ::CCMASK_ICMP,
1095 MI->getOperand(2).getImm(), &MI->getOperand(3));
1097 case SystemZ::CLGIJ:
1098 case SystemZ::CLGRJ:
1099 return SystemZII::Branch(SystemZII::BranchCLG, SystemZ::CCMASK_ICMP,
1100 MI->getOperand(2).getImm(), &MI->getOperand(3));
1103 llvm_unreachable("Unrecognized branch opcode");
1107 void SystemZInstrInfo::getLoadStoreOpcodes(const TargetRegisterClass *RC,
1108 unsigned &LoadOpcode,
1109 unsigned &StoreOpcode) const {
1110 if (RC == &SystemZ::GR32BitRegClass || RC == &SystemZ::ADDR32BitRegClass) {
1111 LoadOpcode = SystemZ::L;
1112 StoreOpcode = SystemZ::ST;
1113 } else if (RC == &SystemZ::GRH32BitRegClass) {
1114 LoadOpcode = SystemZ::LFH;
1115 StoreOpcode = SystemZ::STFH;
1116 } else if (RC == &SystemZ::GRX32BitRegClass) {
1117 LoadOpcode = SystemZ::LMux;
1118 StoreOpcode = SystemZ::STMux;
1119 } else if (RC == &SystemZ::GR64BitRegClass ||
1120 RC == &SystemZ::ADDR64BitRegClass) {
1121 LoadOpcode = SystemZ::LG;
1122 StoreOpcode = SystemZ::STG;
1123 } else if (RC == &SystemZ::GR128BitRegClass ||
1124 RC == &SystemZ::ADDR128BitRegClass) {
1125 LoadOpcode = SystemZ::L128;
1126 StoreOpcode = SystemZ::ST128;
1127 } else if (RC == &SystemZ::FP32BitRegClass) {
1128 LoadOpcode = SystemZ::LE;
1129 StoreOpcode = SystemZ::STE;
1130 } else if (RC == &SystemZ::FP64BitRegClass) {
1131 LoadOpcode = SystemZ::LD;
1132 StoreOpcode = SystemZ::STD;
1133 } else if (RC == &SystemZ::FP128BitRegClass) {
1134 LoadOpcode = SystemZ::LX;
1135 StoreOpcode = SystemZ::STX;
1136 } else if (RC == &SystemZ::VR32BitRegClass) {
1137 LoadOpcode = SystemZ::VL32;
1138 StoreOpcode = SystemZ::VST32;
1139 } else if (RC == &SystemZ::VR64BitRegClass) {
1140 LoadOpcode = SystemZ::VL64;
1141 StoreOpcode = SystemZ::VST64;
1142 } else if (RC == &SystemZ::VF128BitRegClass ||
1143 RC == &SystemZ::VR128BitRegClass) {
1144 LoadOpcode = SystemZ::VL;
1145 StoreOpcode = SystemZ::VST;
1147 llvm_unreachable("Unsupported regclass to load or store");
1150 unsigned SystemZInstrInfo::getOpcodeForOffset(unsigned Opcode,
1151 int64_t Offset) const {
1152 const MCInstrDesc &MCID = get(Opcode);
1153 int64_t Offset2 = (MCID.TSFlags & SystemZII::Is128Bit ? Offset + 8 : Offset);
1154 if (isUInt<12>(Offset) && isUInt<12>(Offset2)) {
1155 // Get the instruction to use for unsigned 12-bit displacements.
1156 int Disp12Opcode = SystemZ::getDisp12Opcode(Opcode);
1157 if (Disp12Opcode >= 0)
1158 return Disp12Opcode;
1160 // All address-related instructions can use unsigned 12-bit
1164 if (isInt<20>(Offset) && isInt<20>(Offset2)) {
1165 // Get the instruction to use for signed 20-bit displacements.
1166 int Disp20Opcode = SystemZ::getDisp20Opcode(Opcode);
1167 if (Disp20Opcode >= 0)
1168 return Disp20Opcode;
1170 // Check whether Opcode allows signed 20-bit displacements.
1171 if (MCID.TSFlags & SystemZII::Has20BitOffset)
1177 unsigned SystemZInstrInfo::getLoadAndTest(unsigned Opcode) const {
1179 case SystemZ::L: return SystemZ::LT;
1180 case SystemZ::LY: return SystemZ::LT;
1181 case SystemZ::LG: return SystemZ::LTG;
1182 case SystemZ::LGF: return SystemZ::LTGF;
1183 case SystemZ::LR: return SystemZ::LTR;
1184 case SystemZ::LGFR: return SystemZ::LTGFR;
1185 case SystemZ::LGR: return SystemZ::LTGR;
1186 case SystemZ::LER: return SystemZ::LTEBR;
1187 case SystemZ::LDR: return SystemZ::LTDBR;
1188 case SystemZ::LXR: return SystemZ::LTXBR;
1189 case SystemZ::LCDFR: return SystemZ::LCDBR;
1190 case SystemZ::LPDFR: return SystemZ::LPDBR;
1191 case SystemZ::LNDFR: return SystemZ::LNDBR;
1192 case SystemZ::LCDFR_32: return SystemZ::LCEBR;
1193 case SystemZ::LPDFR_32: return SystemZ::LPEBR;
1194 case SystemZ::LNDFR_32: return SystemZ::LNEBR;
1195 // On zEC12 we prefer to use RISBGN. But if there is a chance to
1196 // actually use the condition code, we may turn it back into RISGB.
1197 // Note that RISBG is not really a "load-and-test" instruction,
1198 // but sets the same condition code values, so is OK to use here.
1199 case SystemZ::RISBGN: return SystemZ::RISBG;
1204 // Return true if Mask matches the regexp 0*1+0*, given that zero masks
1205 // have already been filtered out. Store the first set bit in LSB and
1206 // the number of set bits in Length if so.
1207 static bool isStringOfOnes(uint64_t Mask, unsigned &LSB, unsigned &Length) {
1208 unsigned First = findFirstSet(Mask);
1209 uint64_t Top = (Mask >> First) + 1;
1210 if ((Top & -Top) == Top) {
1212 Length = findFirstSet(Top);
1218 bool SystemZInstrInfo::isRxSBGMask(uint64_t Mask, unsigned BitSize,
1219 unsigned &Start, unsigned &End) const {
1220 // Reject trivial all-zero masks.
1221 Mask &= allOnes(BitSize);
1225 // Handle the 1+0+ or 0+1+0* cases. Start then specifies the index of
1226 // the msb and End specifies the index of the lsb.
1227 unsigned LSB, Length;
1228 if (isStringOfOnes(Mask, LSB, Length)) {
1229 Start = 63 - (LSB + Length - 1);
1234 // Handle the wrap-around 1+0+1+ cases. Start then specifies the msb
1235 // of the low 1s and End specifies the lsb of the high 1s.
1236 if (isStringOfOnes(Mask ^ allOnes(BitSize), LSB, Length)) {
1237 assert(LSB > 0 && "Bottom bit must be set");
1238 assert(LSB + Length < BitSize && "Top bit must be set");
1239 Start = 63 - (LSB - 1);
1240 End = 63 - (LSB + Length);
1247 unsigned SystemZInstrInfo::getCompareAndBranch(unsigned Opcode,
1248 const MachineInstr *MI) const {
1251 return SystemZ::CRJ;
1253 return SystemZ::CGRJ;
1255 return MI && isInt<8>(MI->getOperand(1).getImm()) ? SystemZ::CIJ : 0;
1257 return MI && isInt<8>(MI->getOperand(1).getImm()) ? SystemZ::CGIJ : 0;
1259 return SystemZ::CLRJ;
1261 return SystemZ::CLGRJ;
1263 return MI && isUInt<8>(MI->getOperand(1).getImm()) ? SystemZ::CLIJ : 0;
1264 case SystemZ::CLGFI:
1265 return MI && isUInt<8>(MI->getOperand(1).getImm()) ? SystemZ::CLGIJ : 0;
1271 void SystemZInstrInfo::loadImmediate(MachineBasicBlock &MBB,
1272 MachineBasicBlock::iterator MBBI,
1273 unsigned Reg, uint64_t Value) const {
1274 DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
1276 if (isInt<16>(Value))
1277 Opcode = SystemZ::LGHI;
1278 else if (SystemZ::isImmLL(Value))
1279 Opcode = SystemZ::LLILL;
1280 else if (SystemZ::isImmLH(Value)) {
1281 Opcode = SystemZ::LLILH;
1284 assert(isInt<32>(Value) && "Huge values not handled yet");
1285 Opcode = SystemZ::LGFI;
1287 BuildMI(MBB, MBBI, DL, get(Opcode), Reg).addImm(Value);