1 //===-- ARM/ARMCodeEmitter.cpp - Convert ARM code to machine code ---------===//
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 pass that transforms the ARM machine instructions into
11 // relocatable machine code.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
17 #include "ARMAddressingModes.h"
18 #include "ARMConstantPoolValue.h"
19 #include "ARMInstrInfo.h"
20 #include "ARMRelocations.h"
21 #include "ARMSubtarget.h"
22 #include "ARMTargetMachine.h"
23 #include "llvm/Constants.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Function.h"
26 #include "llvm/PassManager.h"
27 #include "llvm/CodeGen/JITCodeEmitter.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFunctionPass.h"
30 #include "llvm/CodeGen/MachineInstr.h"
31 #include "llvm/CodeGen/MachineJumpTableInfo.h"
32 #include "llvm/CodeGen/MachineModuleInfo.h"
33 #include "llvm/CodeGen/Passes.h"
34 #include "llvm/ADT/Statistic.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/raw_ostream.h"
43 STATISTIC(NumEmitted, "Number of machine instructions emitted");
47 class ARMCodeEmitter : public MachineFunctionPass {
49 const ARMInstrInfo *II;
51 const ARMSubtarget *Subtarget;
54 MachineModuleInfo *MMI;
55 const std::vector<MachineConstantPoolEntry> *MCPEs;
56 const std::vector<MachineJumpTableEntry> *MJTEs;
60 void getAnalysisUsage(AnalysisUsage &AU) const {
61 AU.addRequired<MachineModuleInfo>();
62 MachineFunctionPass::getAnalysisUsage(AU);
67 ARMCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce)
68 : MachineFunctionPass(ID), JTI(0),
69 II((const ARMInstrInfo *)tm.getInstrInfo()),
70 TD(tm.getTargetData()), TM(tm),
71 MCE(mce), MCPEs(0), MJTEs(0),
72 IsPIC(TM.getRelocationModel() == Reloc::PIC_), IsThumb(false) {}
74 /// getBinaryCodeForInstr - This function, generated by the
75 /// CodeEmitterGenerator using TableGen, produces the binary encoding for
76 /// machine instructions.
77 unsigned getBinaryCodeForInstr(const MachineInstr &MI) const;
79 bool runOnMachineFunction(MachineFunction &MF);
81 virtual const char *getPassName() const {
82 return "ARM Machine Code Emitter";
85 void emitInstruction(const MachineInstr &MI);
89 void emitWordLE(unsigned Binary);
90 void emitDWordLE(uint64_t Binary);
91 void emitConstPoolInstruction(const MachineInstr &MI);
92 void emitMOVi32immInstruction(const MachineInstr &MI);
93 void emitMOVi2piecesInstruction(const MachineInstr &MI);
94 void emitLEApcrelJTInstruction(const MachineInstr &MI);
95 void emitPseudoMoveInstruction(const MachineInstr &MI);
96 void addPCLabel(unsigned LabelID);
97 void emitPseudoInstruction(const MachineInstr &MI);
98 unsigned getMachineSoRegOpValue(const MachineInstr &MI,
99 const TargetInstrDesc &TID,
100 const MachineOperand &MO,
103 unsigned getMachineSoImmOpValue(unsigned SoImm);
104 unsigned getAddrModeSBit(const MachineInstr &MI,
105 const TargetInstrDesc &TID) const;
107 void emitDataProcessingInstruction(const MachineInstr &MI,
108 unsigned ImplicitRd = 0,
109 unsigned ImplicitRn = 0);
111 void emitLoadStoreInstruction(const MachineInstr &MI,
112 unsigned ImplicitRd = 0,
113 unsigned ImplicitRn = 0);
115 void emitMiscLoadStoreInstruction(const MachineInstr &MI,
116 unsigned ImplicitRn = 0);
118 void emitLoadStoreMultipleInstruction(const MachineInstr &MI);
120 void emitMulFrmInstruction(const MachineInstr &MI);
122 void emitExtendInstruction(const MachineInstr &MI);
124 void emitMiscArithInstruction(const MachineInstr &MI);
126 void emitSaturateInstruction(const MachineInstr &MI);
128 void emitBranchInstruction(const MachineInstr &MI);
130 void emitInlineJumpTable(unsigned JTIndex);
132 void emitMiscBranchInstruction(const MachineInstr &MI);
134 void emitVFPArithInstruction(const MachineInstr &MI);
136 void emitVFPConversionInstruction(const MachineInstr &MI);
138 void emitVFPLoadStoreInstruction(const MachineInstr &MI);
140 void emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI);
142 void emitNEONLaneInstruction(const MachineInstr &MI);
143 void emitNEONDupInstruction(const MachineInstr &MI);
144 void emitNEON1RegModImmInstruction(const MachineInstr &MI);
145 void emitNEON2RegInstruction(const MachineInstr &MI);
146 void emitNEON3RegInstruction(const MachineInstr &MI);
148 /// getMachineOpValue - Return binary encoding of operand. If the machine
149 /// operand requires relocation, record the relocation and return zero.
150 unsigned getMachineOpValue(const MachineInstr &MI,
151 const MachineOperand &MO) const;
152 unsigned getMachineOpValue(const MachineInstr &MI, unsigned OpIdx) const {
153 return getMachineOpValue(MI, MI.getOperand(OpIdx));
156 // FIXME: The legacy JIT ARMCodeEmitter doesn't rely on the the
157 // TableGen'erated getBinaryCodeForInstr() function to encode any
158 // operand values, instead querying getMachineOpValue() directly for
159 // each operand it needs to encode. Thus, any of the new encoder
160 // helper functions can simply return 0 as the values the return
161 // are already handled elsewhere. They are placeholders to allow this
162 // encoder to continue to function until the MC encoder is sufficiently
163 // far along that this one can be eliminated entirely.
164 unsigned NEONThumb2DataIPostEncoder(const MachineInstr &MI, unsigned Val)
166 unsigned NEONThumb2LoadStorePostEncoder(const MachineInstr &MI,unsigned Val)
168 unsigned NEONThumb2DupPostEncoder(const MachineInstr &MI,unsigned Val)
170 unsigned getBranchTargetOpValue(const MachineInstr &MI, unsigned Op)
172 unsigned getCCOutOpValue(const MachineInstr &MI, unsigned Op)
174 unsigned getSOImmOpValue(const MachineInstr &MI, unsigned Op)
176 unsigned getT2SOImmOpValue(const MachineInstr &MI, unsigned Op)
178 unsigned getSORegOpValue(const MachineInstr &MI, unsigned Op)
180 unsigned getT2SORegOpValue(const MachineInstr &MI, unsigned Op)
182 unsigned getRotImmOpValue(const MachineInstr &MI, unsigned Op)
184 unsigned getImmMinusOneOpValue(const MachineInstr &MI, unsigned Op)
186 unsigned getAddrMode6AddressOpValue(const MachineInstr &MI, unsigned Op)
188 unsigned getAddrMode6OffsetOpValue(const MachineInstr &MI, unsigned Op)
190 unsigned getBitfieldInvertedMaskOpValue(const MachineInstr &MI,
191 unsigned Op) const { return 0; }
192 uint32_t getLdStmModeOpValue(const MachineInstr &MI, unsigned OpIdx)
194 uint32_t getLdStSORegOpValue(const MachineInstr &MI, unsigned OpIdx)
197 unsigned getAddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
200 // {12} = (U)nsigned (add == '1', sub == '0')
202 const MachineOperand &MO = MI.getOperand(Op);
203 const MachineOperand &MO1 = MI.getOperand(Op + 1);
205 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
208 unsigned Reg = getARMRegisterNumbering(MO.getReg());
209 int32_t Imm12 = MO1.getImm();
211 Binary = Imm12 & 0xfff;
214 Binary |= (Reg << 13);
218 unsigned getMovtImmOpValue(const MachineInstr &MI, unsigned Op) const {
222 uint32_t getAddrMode2OpValue(const MachineInstr &MI, unsigned OpIdx)
224 uint32_t getAddrMode2OffsetOpValue(const MachineInstr &MI, unsigned OpIdx)
226 uint32_t getAddrMode3OffsetOpValue(const MachineInstr &MI, unsigned OpIdx)
228 uint32_t getAddrMode3OpValue(const MachineInstr &MI, unsigned Op) const
230 uint32_t getAddrMode5OpValue(const MachineInstr &MI, unsigned Op) const {
232 // {12} = (U)nsigned (add == '1', sub == '0')
234 const MachineOperand &MO = MI.getOperand(Op);
235 const MachineOperand &MO1 = MI.getOperand(Op + 1);
237 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
240 unsigned Reg = getARMRegisterNumbering(MO.getReg());
241 int32_t Imm12 = MO1.getImm();
243 // Special value for #-0
244 if (Imm12 == INT32_MIN)
247 // Immediate is always encoded as positive. The 'U' bit controls add vs
255 uint32_t Binary = Imm12 & 0xfff;
258 Binary |= (Reg << 13);
261 unsigned getNEONVcvtImm32OpValue(const MachineInstr &MI, unsigned Op)
264 unsigned getRegisterListOpValue(const MachineInstr &MI, unsigned Op)
267 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
268 /// machine operand requires relocation, record the relocation and return
270 unsigned getMovi32Value(const MachineInstr &MI,const MachineOperand &MO,
273 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
275 unsigned getShiftOp(unsigned Imm) const ;
277 /// Routines that handle operands which add machine relocations which are
278 /// fixed up by the relocation stage.
279 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
280 bool MayNeedFarStub, bool Indirect,
281 intptr_t ACPV = 0) const;
282 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
283 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
284 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
285 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
286 intptr_t JTBase = 0) const;
290 char ARMCodeEmitter::ID = 0;
292 /// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
293 /// code to the specified MCE object.
294 FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
295 JITCodeEmitter &JCE) {
296 return new ARMCodeEmitter(TM, JCE);
299 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
300 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
301 MF.getTarget().getRelocationModel() != Reloc::Static) &&
302 "JIT relocation model must be set to static or default!");
303 JTI = ((ARMTargetMachine &)MF.getTarget()).getJITInfo();
304 II = ((const ARMTargetMachine &)MF.getTarget()).getInstrInfo();
305 TD = ((const ARMTargetMachine &)MF.getTarget()).getTargetData();
306 Subtarget = &TM.getSubtarget<ARMSubtarget>();
307 MCPEs = &MF.getConstantPool()->getConstants();
309 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
310 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
311 IsThumb = MF.getInfo<ARMFunctionInfo>()->isThumbFunction();
312 JTI->Initialize(MF, IsPIC);
313 MMI = &getAnalysis<MachineModuleInfo>();
314 MCE.setModuleInfo(MMI);
317 DEBUG(errs() << "JITTing function '"
318 << MF.getFunction()->getName() << "'\n");
319 MCE.startFunction(MF);
320 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
322 MCE.StartMachineBasicBlock(MBB);
323 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
327 } while (MCE.finishFunction(MF));
332 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
334 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
335 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
336 default: llvm_unreachable("Unknown shift opc!");
337 case ARM_AM::asr: return 2;
338 case ARM_AM::lsl: return 0;
339 case ARM_AM::lsr: return 1;
341 case ARM_AM::rrx: return 3;
346 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
347 /// machine operand requires relocation, record the relocation and return zero.
348 unsigned ARMCodeEmitter::getMovi32Value(const MachineInstr &MI,
349 const MachineOperand &MO,
351 assert(((Reloc == ARM::reloc_arm_movt) || (Reloc == ARM::reloc_arm_movw))
352 && "Relocation to this function should be for movt or movw");
355 return static_cast<unsigned>(MO.getImm());
356 else if (MO.isGlobal())
357 emitGlobalAddress(MO.getGlobal(), Reloc, true, false);
358 else if (MO.isSymbol())
359 emitExternalSymbolAddress(MO.getSymbolName(), Reloc);
361 emitMachineBasicBlock(MO.getMBB(), Reloc);
366 llvm_unreachable("Unsupported operand type for movw/movt");
371 /// getMachineOpValue - Return binary encoding of operand. If the machine
372 /// operand requires relocation, record the relocation and return zero.
373 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
374 const MachineOperand &MO) const {
376 return getARMRegisterNumbering(MO.getReg());
378 return static_cast<unsigned>(MO.getImm());
379 else if (MO.isGlobal())
380 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
381 else if (MO.isSymbol())
382 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
383 else if (MO.isCPI()) {
384 const TargetInstrDesc &TID = MI.getDesc();
385 // For VFP load, the immediate offset is multiplied by 4.
386 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
387 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
388 emitConstPoolAddress(MO.getIndex(), Reloc);
389 } else if (MO.isJTI())
390 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
392 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
394 llvm_unreachable("Unable to encode MachineOperand!");
398 /// emitGlobalAddress - Emit the specified address to the code stream.
400 void ARMCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
401 bool MayNeedFarStub, bool Indirect,
402 intptr_t ACPV) const {
403 MachineRelocation MR = Indirect
404 ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
405 const_cast<GlobalValue *>(GV),
406 ACPV, MayNeedFarStub)
407 : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
408 const_cast<GlobalValue *>(GV), ACPV,
410 MCE.addRelocation(MR);
413 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
414 /// be emitted to the current location in the function, and allow it to be PC
416 void ARMCodeEmitter::
417 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
418 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
422 /// emitConstPoolAddress - Arrange for the address of an constant pool
423 /// to be emitted to the current location in the function, and allow it to be PC
425 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
426 // Tell JIT emitter we'll resolve the address.
427 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
428 Reloc, CPI, 0, true));
431 /// emitJumpTableAddress - Arrange for the address of a jump table to
432 /// be emitted to the current location in the function, and allow it to be PC
434 void ARMCodeEmitter::
435 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
436 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
437 Reloc, JTIndex, 0, true));
440 /// emitMachineBasicBlock - Emit the specified address basic block.
441 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
443 intptr_t JTBase) const {
444 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
448 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
449 DEBUG(errs() << " 0x";
450 errs().write_hex(Binary) << "\n");
451 MCE.emitWordLE(Binary);
454 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
455 DEBUG(errs() << " 0x";
456 errs().write_hex(Binary) << "\n");
457 MCE.emitDWordLE(Binary);
460 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
461 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
463 MCE.processDebugLoc(MI.getDebugLoc(), true);
465 ++NumEmitted; // Keep track of the # of mi's emitted
466 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
468 llvm_unreachable("Unhandled instruction encoding format!");
472 if (MI.getOpcode() == ARM::LEApcrelJT) {
473 // Materialize jumptable address.
474 emitLEApcrelJTInstruction(MI);
477 llvm_unreachable("Unhandled instruction encoding!");
480 emitPseudoInstruction(MI);
483 case ARMII::DPSoRegFrm:
484 emitDataProcessingInstruction(MI);
488 emitLoadStoreInstruction(MI);
490 case ARMII::LdMiscFrm:
491 case ARMII::StMiscFrm:
492 emitMiscLoadStoreInstruction(MI);
494 case ARMII::LdStMulFrm:
495 emitLoadStoreMultipleInstruction(MI);
498 emitMulFrmInstruction(MI);
501 emitExtendInstruction(MI);
503 case ARMII::ArithMiscFrm:
504 emitMiscArithInstruction(MI);
507 emitSaturateInstruction(MI);
510 emitBranchInstruction(MI);
512 case ARMII::BrMiscFrm:
513 emitMiscBranchInstruction(MI);
516 case ARMII::VFPUnaryFrm:
517 case ARMII::VFPBinaryFrm:
518 emitVFPArithInstruction(MI);
520 case ARMII::VFPConv1Frm:
521 case ARMII::VFPConv2Frm:
522 case ARMII::VFPConv3Frm:
523 case ARMII::VFPConv4Frm:
524 case ARMII::VFPConv5Frm:
525 emitVFPConversionInstruction(MI);
527 case ARMII::VFPLdStFrm:
528 emitVFPLoadStoreInstruction(MI);
530 case ARMII::VFPLdStMulFrm:
531 emitVFPLoadStoreMultipleInstruction(MI);
534 // NEON instructions.
535 case ARMII::NGetLnFrm:
536 case ARMII::NSetLnFrm:
537 emitNEONLaneInstruction(MI);
540 emitNEONDupInstruction(MI);
542 case ARMII::N1RegModImmFrm:
543 emitNEON1RegModImmInstruction(MI);
545 case ARMII::N2RegFrm:
546 emitNEON2RegInstruction(MI);
548 case ARMII::N3RegFrm:
549 emitNEON3RegInstruction(MI);
552 MCE.processDebugLoc(MI.getDebugLoc(), false);
555 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
556 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
557 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
558 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
560 // Remember the CONSTPOOL_ENTRY address for later relocation.
561 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
563 // Emit constpool island entry. In most cases, the actual values will be
564 // resolved and relocated after code emission.
565 if (MCPE.isMachineConstantPoolEntry()) {
566 ARMConstantPoolValue *ACPV =
567 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
569 DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
570 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
572 assert(ACPV->isGlobalValue() && "unsupported constant pool value");
573 const GlobalValue *GV = ACPV->getGV();
575 Reloc::Model RelocM = TM.getRelocationModel();
576 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
578 Subtarget->GVIsIndirectSymbol(GV, RelocM),
581 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
585 const Constant *CV = MCPE.Val.ConstVal;
588 errs() << " ** Constant pool #" << CPI << " @ "
589 << (void*)MCE.getCurrentPCValue() << " ";
590 if (const Function *F = dyn_cast<Function>(CV))
591 errs() << F->getName();
597 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
598 emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
600 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
601 uint32_t Val = uint32_t(*CI->getValue().getRawData());
603 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
604 if (CFP->getType()->isFloatTy())
605 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
606 else if (CFP->getType()->isDoubleTy())
607 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
609 llvm_unreachable("Unable to handle this constantpool entry!");
612 llvm_unreachable("Unable to handle this constantpool entry!");
617 void ARMCodeEmitter::emitMOVi32immInstruction(const MachineInstr &MI) {
618 const MachineOperand &MO0 = MI.getOperand(0);
619 const MachineOperand &MO1 = MI.getOperand(1);
621 // Emit the 'movw' instruction.
622 unsigned Binary = 0x30 << 20; // mov: Insts{27-20} = 0b00110000
624 unsigned Lo16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movw) & 0xFFFF;
626 // Set the conditional execution predicate.
627 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
630 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
632 // Encode imm16 as imm4:imm12
633 Binary |= Lo16 & 0xFFF; // Insts{11-0} = imm12
634 Binary |= ((Lo16 >> 12) & 0xF) << 16; // Insts{19-16} = imm4
637 unsigned Hi16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movt) >> 16;
638 // Emit the 'movt' instruction.
639 Binary = 0x34 << 20; // movt: Insts{27-20} = 0b00110100
641 // Set the conditional execution predicate.
642 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
645 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
647 // Encode imm16 as imm4:imm1, same as movw above.
648 Binary |= Hi16 & 0xFFF;
649 Binary |= ((Hi16 >> 12) & 0xF) << 16;
653 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
654 const MachineOperand &MO0 = MI.getOperand(0);
655 const MachineOperand &MO1 = MI.getOperand(1);
656 assert(MO1.isImm() && ARM_AM::isSOImmTwoPartVal(MO1.getImm()) &&
657 "Not a valid so_imm value!");
658 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
659 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
661 // Emit the 'mov' instruction.
662 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
664 // Set the conditional execution predicate.
665 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
668 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
671 // Set bit I(25) to identify this is the immediate form of <shifter_op>
672 Binary |= 1 << ARMII::I_BitShift;
673 Binary |= getMachineSoImmOpValue(V1);
676 // Now the 'orr' instruction.
677 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
679 // Set the conditional execution predicate.
680 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
683 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
686 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
689 // Set bit I(25) to identify this is the immediate form of <shifter_op>
690 Binary |= 1 << ARMII::I_BitShift;
691 Binary |= getMachineSoImmOpValue(V2);
695 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
696 // It's basically add r, pc, (LJTI - $+8)
698 const TargetInstrDesc &TID = MI.getDesc();
700 // Emit the 'add' instruction.
701 unsigned Binary = 0x4 << 21; // add: Insts{24-21} = 0b0100
703 // Set the conditional execution predicate
704 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
706 // Encode S bit if MI modifies CPSR.
707 Binary |= getAddrModeSBit(MI, TID);
710 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
712 // Encode Rn which is PC.
713 Binary |= getARMRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
715 // Encode the displacement.
716 Binary |= 1 << ARMII::I_BitShift;
717 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
722 void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
723 unsigned Opcode = MI.getDesc().Opcode;
725 // Part of binary is determined by TableGn.
726 unsigned Binary = getBinaryCodeForInstr(MI);
728 // Set the conditional execution predicate
729 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
731 // Encode S bit if MI modifies CPSR.
732 if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
733 Binary |= 1 << ARMII::S_BitShift;
735 // Encode register def if there is one.
736 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
738 // Encode the shift operation.
745 case ARM::MOVsrl_flag:
747 Binary |= (0x2 << 4) | (1 << 7);
749 case ARM::MOVsra_flag:
751 Binary |= (0x4 << 4) | (1 << 7);
755 // Encode register Rm.
756 Binary |= getMachineOpValue(MI, 1);
761 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
762 DEBUG(errs() << " ** LPC" << LabelID << " @ "
763 << (void*)MCE.getCurrentPCValue() << '\n');
764 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
767 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
768 unsigned Opcode = MI.getDesc().Opcode;
771 llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
775 case ARM::BMOVPCRXr9: {
776 // First emit mov lr, pc
777 unsigned Binary = 0x01a0e00f;
778 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
781 // and then emit the branch.
782 emitMiscBranchInstruction(MI);
785 case TargetOpcode::INLINEASM: {
786 // We allow inline assembler nodes with empty bodies - they can
787 // implicitly define registers, which is ok for JIT.
788 if (MI.getOperand(0).getSymbolName()[0]) {
789 report_fatal_error("JIT does not support inline asm!");
793 case TargetOpcode::PROLOG_LABEL:
794 case TargetOpcode::EH_LABEL:
795 MCE.emitLabel(MI.getOperand(0).getMCSymbol());
797 case TargetOpcode::IMPLICIT_DEF:
798 case TargetOpcode::KILL:
801 case ARM::CONSTPOOL_ENTRY:
802 emitConstPoolInstruction(MI);
805 // Remember of the address of the PC label for relocation later.
806 addPCLabel(MI.getOperand(2).getImm());
807 // PICADD is just an add instruction that implicitly read pc.
808 emitDataProcessingInstruction(MI, 0, ARM::PC);
815 // Remember of the address of the PC label for relocation later.
816 addPCLabel(MI.getOperand(2).getImm());
817 // These are just load / store instructions that implicitly read pc.
818 emitLoadStoreInstruction(MI, 0, ARM::PC);
825 // Remember of the address of the PC label for relocation later.
826 addPCLabel(MI.getOperand(2).getImm());
827 // These are just load / store instructions that implicitly read pc.
828 emitMiscLoadStoreInstruction(MI, ARM::PC);
833 // Two instructions to materialize a constant.
834 if (Subtarget->hasV6T2Ops())
835 emitMOVi32immInstruction(MI);
837 emitMOVi2piecesInstruction(MI);
840 case ARM::LEApcrelJT:
841 // Materialize jumptable address.
842 emitLEApcrelJTInstruction(MI);
845 case ARM::MOVsrl_flag:
846 case ARM::MOVsra_flag:
847 emitPseudoMoveInstruction(MI);
852 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
853 const TargetInstrDesc &TID,
854 const MachineOperand &MO,
856 unsigned Binary = getMachineOpValue(MI, MO);
858 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
859 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
860 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
862 // Encode the shift opcode.
864 unsigned Rs = MO1.getReg();
866 // Set shift operand (bit[7:4]).
871 // RRX - 0110 and bit[11:8] clear.
873 default: llvm_unreachable("Unknown shift opc!");
874 case ARM_AM::lsl: SBits = 0x1; break;
875 case ARM_AM::lsr: SBits = 0x3; break;
876 case ARM_AM::asr: SBits = 0x5; break;
877 case ARM_AM::ror: SBits = 0x7; break;
878 case ARM_AM::rrx: SBits = 0x6; break;
881 // Set shift operand (bit[6:4]).
887 default: llvm_unreachable("Unknown shift opc!");
888 case ARM_AM::lsl: SBits = 0x0; break;
889 case ARM_AM::lsr: SBits = 0x2; break;
890 case ARM_AM::asr: SBits = 0x4; break;
891 case ARM_AM::ror: SBits = 0x6; break;
894 Binary |= SBits << 4;
895 if (SOpc == ARM_AM::rrx)
898 // Encode the shift operation Rs or shift_imm (except rrx).
900 // Encode Rs bit[11:8].
901 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
902 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
905 // Encode shift_imm bit[11:7].
906 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
909 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
910 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
911 assert(SoImmVal != -1 && "Not a valid so_imm value!");
913 // Encode rotate_imm.
914 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
915 << ARMII::SoRotImmShift;
918 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
922 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
923 const TargetInstrDesc &TID) const {
924 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
925 const MachineOperand &MO = MI.getOperand(i-1);
926 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
927 return 1 << ARMII::S_BitShift;
932 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
934 unsigned ImplicitRn) {
935 const TargetInstrDesc &TID = MI.getDesc();
937 // Part of binary is determined by TableGn.
938 unsigned Binary = getBinaryCodeForInstr(MI);
940 // Set the conditional execution predicate
941 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
943 // Encode S bit if MI modifies CPSR.
944 Binary |= getAddrModeSBit(MI, TID);
946 // Encode register def if there is one.
947 unsigned NumDefs = TID.getNumDefs();
950 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
952 // Special handling for implicit use (e.g. PC).
953 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
955 if (TID.Opcode == ARM::MOVi16) {
956 // Get immediate from MI.
957 unsigned Lo16 = getMovi32Value(MI, MI.getOperand(OpIdx),
958 ARM::reloc_arm_movw);
959 // Encode imm which is the same as in emitMOVi32immInstruction().
960 Binary |= Lo16 & 0xFFF;
961 Binary |= ((Lo16 >> 12) & 0xF) << 16;
964 } else if(TID.Opcode == ARM::MOVTi16) {
965 unsigned Hi16 = (getMovi32Value(MI, MI.getOperand(OpIdx),
966 ARM::reloc_arm_movt) >> 16);
967 Binary |= Hi16 & 0xFFF;
968 Binary |= ((Hi16 >> 12) & 0xF) << 16;
971 } else if ((TID.Opcode == ARM::BFC) || (TID.Opcode == ARM::BFI)) {
972 uint32_t v = ~MI.getOperand(2).getImm();
973 int32_t lsb = CountTrailingZeros_32(v);
974 int32_t msb = (32 - CountLeadingZeros_32(v)) - 1;
975 // Instr{20-16} = msb, Instr{11-7} = lsb
976 Binary |= (msb & 0x1F) << 16;
977 Binary |= (lsb & 0x1F) << 7;
980 } else if ((TID.Opcode == ARM::UBFX) || (TID.Opcode == ARM::SBFX)) {
981 // Encode Rn in Instr{0-3}
982 Binary |= getMachineOpValue(MI, OpIdx++);
984 uint32_t lsb = MI.getOperand(OpIdx++).getImm();
985 uint32_t widthm1 = MI.getOperand(OpIdx++).getImm() - 1;
987 // Instr{20-16} = widthm1, Instr{11-7} = lsb
988 Binary |= (widthm1 & 0x1F) << 16;
989 Binary |= (lsb & 0x1F) << 7;
994 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
995 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
998 // Encode first non-shifter register operand if there is one.
999 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
1002 // Special handling for implicit use (e.g. PC).
1003 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1005 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
1010 // Encode shifter operand.
1011 const MachineOperand &MO = MI.getOperand(OpIdx);
1012 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
1014 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
1019 // Encode register Rm.
1020 emitWordLE(Binary | getARMRegisterNumbering(MO.getReg()));
1025 Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
1030 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
1031 unsigned ImplicitRd,
1032 unsigned ImplicitRn) {
1033 const TargetInstrDesc &TID = MI.getDesc();
1034 unsigned Form = TID.TSFlags & ARMII::FormMask;
1035 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1037 // Part of binary is determined by TableGn.
1038 unsigned Binary = getBinaryCodeForInstr(MI);
1040 // If this is an LDRi12, STRi12 or LDRcp, nothing more needs be done.
1041 if (MI.getOpcode() == ARM::LDRi12 || MI.getOpcode() == ARM::LDRcp ||
1042 MI.getOpcode() == ARM::STRi12) {
1047 // Set the conditional execution predicate
1048 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1052 // Operand 0 of a pre- and post-indexed store is the address base
1053 // writeback. Skip it.
1054 bool Skipped = false;
1055 if (IsPrePost && Form == ARMII::StFrm) {
1060 // Set first operand
1062 // Special handling for implicit use (e.g. PC).
1063 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
1065 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1067 // Set second operand
1069 // Special handling for implicit use (e.g. PC).
1070 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1072 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1074 // If this is a two-address operand, skip it. e.g. LDR_PRE.
1075 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1078 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1079 unsigned AM2Opc = (ImplicitRn == ARM::PC)
1080 ? 0 : MI.getOperand(OpIdx+1).getImm();
1082 // Set bit U(23) according to sign of immed value (positive or negative).
1083 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
1085 if (!MO2.getReg()) { // is immediate
1086 if (ARM_AM::getAM2Offset(AM2Opc))
1087 // Set the value of offset_12 field
1088 Binary |= ARM_AM::getAM2Offset(AM2Opc);
1093 // Set bit I(25), because this is not in immediate encoding.
1094 Binary |= 1 << ARMII::I_BitShift;
1095 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
1096 // Set bit[3:0] to the corresponding Rm register
1097 Binary |= getARMRegisterNumbering(MO2.getReg());
1099 // If this instr is in scaled register offset/index instruction, set
1100 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
1101 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
1102 Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
1103 Binary |= ShImm << ARMII::ShiftShift; // shift_immed
1109 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
1110 unsigned ImplicitRn) {
1111 const TargetInstrDesc &TID = MI.getDesc();
1112 unsigned Form = TID.TSFlags & ARMII::FormMask;
1113 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1115 // Part of binary is determined by TableGn.
1116 unsigned Binary = getBinaryCodeForInstr(MI);
1118 // Set the conditional execution predicate
1119 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1123 // Operand 0 of a pre- and post-indexed store is the address base
1124 // writeback. Skip it.
1125 bool Skipped = false;
1126 if (IsPrePost && Form == ARMII::StMiscFrm) {
1131 // Set first operand
1132 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1134 // Skip LDRD and STRD's second operand.
1135 if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
1138 // Set second operand
1140 // Special handling for implicit use (e.g. PC).
1141 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1143 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1145 // If this is a two-address operand, skip it. e.g. LDRH_POST.
1146 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1149 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1150 unsigned AM3Opc = (ImplicitRn == ARM::PC)
1151 ? 0 : MI.getOperand(OpIdx+1).getImm();
1153 // Set bit U(23) according to sign of immed value (positive or negative)
1154 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
1157 // If this instr is in register offset/index encoding, set bit[3:0]
1158 // to the corresponding Rm register.
1160 Binary |= getARMRegisterNumbering(MO2.getReg());
1165 // This instr is in immediate offset/index encoding, set bit 22 to 1.
1166 Binary |= 1 << ARMII::AM3_I_BitShift;
1167 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
1169 Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
1170 Binary |= (ImmOffs & 0xF); // immedL
1176 static unsigned getAddrModeUPBits(unsigned Mode) {
1177 unsigned Binary = 0;
1179 // Set addressing mode by modifying bits U(23) and P(24)
1180 // IA - Increment after - bit U = 1 and bit P = 0
1181 // IB - Increment before - bit U = 1 and bit P = 1
1182 // DA - Decrement after - bit U = 0 and bit P = 0
1183 // DB - Decrement before - bit U = 0 and bit P = 1
1185 default: llvm_unreachable("Unknown addressing sub-mode!");
1186 case ARM_AM::da: break;
1187 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
1188 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
1189 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
1195 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
1196 const TargetInstrDesc &TID = MI.getDesc();
1197 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1199 // Part of binary is determined by TableGn.
1200 unsigned Binary = getBinaryCodeForInstr(MI);
1202 // Set the conditional execution predicate
1203 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1205 // Skip operand 0 of an instruction with base register update.
1210 // Set base address operand
1211 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1213 // Set addressing mode by modifying bits U(23) and P(24)
1214 ARM_AM::AMSubMode Mode = ARM_AM::getLoadStoreMultipleSubMode(MI.getOpcode());
1215 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(Mode));
1219 Binary |= 0x1 << ARMII::W_BitShift;
1222 for (unsigned i = OpIdx+2, e = MI.getNumOperands(); i != e; ++i) {
1223 const MachineOperand &MO = MI.getOperand(i);
1224 if (!MO.isReg() || MO.isImplicit())
1226 unsigned RegNum = getARMRegisterNumbering(MO.getReg());
1227 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
1229 Binary |= 0x1 << RegNum;
1235 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
1236 const TargetInstrDesc &TID = MI.getDesc();
1238 // Part of binary is determined by TableGn.
1239 unsigned Binary = getBinaryCodeForInstr(MI);
1241 // Set the conditional execution predicate
1242 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1244 // Encode S bit if MI modifies CPSR.
1245 Binary |= getAddrModeSBit(MI, TID);
1247 // 32x32->64bit operations have two destination registers. The number
1248 // of register definitions will tell us if that's what we're dealing with.
1250 if (TID.getNumDefs() == 2)
1251 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
1254 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
1257 Binary |= getMachineOpValue(MI, OpIdx++);
1260 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
1262 // Many multiple instructions (e.g. MLA) have three src operands. Encode
1263 // it as Rn (for multiply, that's in the same offset as RdLo.
1264 if (TID.getNumOperands() > OpIdx &&
1265 !TID.OpInfo[OpIdx].isPredicate() &&
1266 !TID.OpInfo[OpIdx].isOptionalDef())
1267 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
1272 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
1273 const TargetInstrDesc &TID = MI.getDesc();
1275 // Part of binary is determined by TableGn.
1276 unsigned Binary = getBinaryCodeForInstr(MI);
1278 // Set the conditional execution predicate
1279 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1284 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1286 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1287 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1289 // Two register operand form.
1291 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1294 Binary |= getMachineOpValue(MI, MO2);
1297 Binary |= getMachineOpValue(MI, MO1);
1300 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1301 if (MI.getOperand(OpIdx).isImm() &&
1302 !TID.OpInfo[OpIdx].isPredicate() &&
1303 !TID.OpInfo[OpIdx].isOptionalDef())
1304 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1309 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1310 const TargetInstrDesc &TID = MI.getDesc();
1312 // Part of binary is determined by TableGn.
1313 unsigned Binary = getBinaryCodeForInstr(MI);
1315 // Set the conditional execution predicate
1316 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1321 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1323 const MachineOperand &MO = MI.getOperand(OpIdx++);
1324 if (OpIdx == TID.getNumOperands() ||
1325 TID.OpInfo[OpIdx].isPredicate() ||
1326 TID.OpInfo[OpIdx].isOptionalDef()) {
1327 // Encode Rm and it's done.
1328 Binary |= getMachineOpValue(MI, MO);
1334 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1337 Binary |= getMachineOpValue(MI, OpIdx++);
1339 // Encode shift_imm.
1340 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1341 if (TID.Opcode == ARM::PKHTB) {
1342 assert(ShiftAmt != 0 && "PKHTB shift_imm is 0!");
1346 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1347 Binary |= ShiftAmt << ARMII::ShiftShift;
1352 void ARMCodeEmitter::emitSaturateInstruction(const MachineInstr &MI) {
1353 const TargetInstrDesc &TID = MI.getDesc();
1355 // Part of binary is determined by TableGen.
1356 unsigned Binary = getBinaryCodeForInstr(MI);
1358 // Set the conditional execution predicate
1359 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1362 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
1364 // Encode saturate bit position.
1365 unsigned Pos = MI.getOperand(1).getImm();
1366 if (TID.Opcode == ARM::SSAT || TID.Opcode == ARM::SSAT16)
1368 assert((Pos < 16 || (Pos < 32 &&
1369 TID.Opcode != ARM::SSAT16 &&
1370 TID.Opcode != ARM::USAT16)) &&
1371 "saturate bit position out of range");
1372 Binary |= Pos << 16;
1375 Binary |= getMachineOpValue(MI, 2);
1377 // Encode shift_imm.
1378 if (TID.getNumOperands() == 4) {
1379 unsigned ShiftOp = MI.getOperand(3).getImm();
1380 ARM_AM::ShiftOpc Opc = ARM_AM::getSORegShOp(ShiftOp);
1381 if (Opc == ARM_AM::asr)
1383 unsigned ShiftAmt = MI.getOperand(3).getImm();
1384 if (ShiftAmt == 32 && Opc == ARM_AM::asr)
1386 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1387 Binary |= ShiftAmt << ARMII::ShiftShift;
1393 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1394 const TargetInstrDesc &TID = MI.getDesc();
1396 if (TID.Opcode == ARM::TPsoft) {
1397 llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1400 // Part of binary is determined by TableGn.
1401 unsigned Binary = getBinaryCodeForInstr(MI);
1403 // Set the conditional execution predicate
1404 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1406 // Set signed_immed_24 field
1407 Binary |= getMachineOpValue(MI, 0);
1412 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1413 // Remember the base address of the inline jump table.
1414 uintptr_t JTBase = MCE.getCurrentPCValue();
1415 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1416 DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1419 // Now emit the jump table entries.
1420 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1421 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1423 // DestBB address - JT base.
1424 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1426 // Absolute DestBB address.
1427 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1432 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1433 const TargetInstrDesc &TID = MI.getDesc();
1435 // Handle jump tables.
1436 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1437 // First emit a ldr pc, [] instruction.
1438 emitDataProcessingInstruction(MI, ARM::PC);
1440 // Then emit the inline jump table.
1442 (TID.Opcode == ARM::BR_JTr)
1443 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1444 emitInlineJumpTable(JTIndex);
1446 } else if (TID.Opcode == ARM::BR_JTm) {
1447 // First emit a ldr pc, [] instruction.
1448 emitLoadStoreInstruction(MI, ARM::PC);
1450 // Then emit the inline jump table.
1451 emitInlineJumpTable(MI.getOperand(3).getIndex());
1455 // Part of binary is determined by TableGn.
1456 unsigned Binary = getBinaryCodeForInstr(MI);
1458 // Set the conditional execution predicate
1459 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1461 if (TID.Opcode == ARM::BX_RET || TID.Opcode == ARM::MOVPCLR)
1462 // The return register is LR.
1463 Binary |= getARMRegisterNumbering(ARM::LR);
1465 // otherwise, set the return register
1466 Binary |= getMachineOpValue(MI, 0);
1471 static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1472 unsigned RegD = MI.getOperand(OpIdx).getReg();
1473 unsigned Binary = 0;
1474 bool isSPVFP = ARM::SPRRegisterClass->contains(RegD);
1475 RegD = getARMRegisterNumbering(RegD);
1477 Binary |= RegD << ARMII::RegRdShift;
1479 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1480 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1485 static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1486 unsigned RegN = MI.getOperand(OpIdx).getReg();
1487 unsigned Binary = 0;
1488 bool isSPVFP = ARM::SPRRegisterClass->contains(RegN);
1489 RegN = getARMRegisterNumbering(RegN);
1491 Binary |= RegN << ARMII::RegRnShift;
1493 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1494 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1499 static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1500 unsigned RegM = MI.getOperand(OpIdx).getReg();
1501 unsigned Binary = 0;
1502 bool isSPVFP = ARM::SPRRegisterClass->contains(RegM);
1503 RegM = getARMRegisterNumbering(RegM);
1507 Binary |= ((RegM & 0x1E) >> 1);
1508 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1513 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1514 const TargetInstrDesc &TID = MI.getDesc();
1516 // Part of binary is determined by TableGn.
1517 unsigned Binary = getBinaryCodeForInstr(MI);
1519 // Set the conditional execution predicate
1520 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1523 assert((Binary & ARMII::D_BitShift) == 0 &&
1524 (Binary & ARMII::N_BitShift) == 0 &&
1525 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1528 Binary |= encodeVFPRd(MI, OpIdx++);
1530 // If this is a two-address operand, skip it, e.g. FMACD.
1531 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1535 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1536 Binary |= encodeVFPRn(MI, OpIdx++);
1538 if (OpIdx == TID.getNumOperands() ||
1539 TID.OpInfo[OpIdx].isPredicate() ||
1540 TID.OpInfo[OpIdx].isOptionalDef()) {
1541 // FCMPEZD etc. has only one operand.
1547 Binary |= encodeVFPRm(MI, OpIdx);
1552 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1553 const TargetInstrDesc &TID = MI.getDesc();
1554 unsigned Form = TID.TSFlags & ARMII::FormMask;
1556 // Part of binary is determined by TableGn.
1557 unsigned Binary = getBinaryCodeForInstr(MI);
1559 // Set the conditional execution predicate
1560 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1564 case ARMII::VFPConv1Frm:
1565 case ARMII::VFPConv2Frm:
1566 case ARMII::VFPConv3Frm:
1568 Binary |= encodeVFPRd(MI, 0);
1570 case ARMII::VFPConv4Frm:
1572 Binary |= encodeVFPRn(MI, 0);
1574 case ARMII::VFPConv5Frm:
1576 Binary |= encodeVFPRm(MI, 0);
1582 case ARMII::VFPConv1Frm:
1584 Binary |= encodeVFPRm(MI, 1);
1586 case ARMII::VFPConv2Frm:
1587 case ARMII::VFPConv3Frm:
1589 Binary |= encodeVFPRn(MI, 1);
1591 case ARMII::VFPConv4Frm:
1592 case ARMII::VFPConv5Frm:
1594 Binary |= encodeVFPRd(MI, 1);
1598 if (Form == ARMII::VFPConv5Frm)
1600 Binary |= encodeVFPRn(MI, 2);
1601 else if (Form == ARMII::VFPConv3Frm)
1603 Binary |= encodeVFPRm(MI, 2);
1608 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1609 // Part of binary is determined by TableGn.
1610 unsigned Binary = getBinaryCodeForInstr(MI);
1612 // Set the conditional execution predicate
1613 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1618 Binary |= encodeVFPRd(MI, OpIdx++);
1620 // Encode address base.
1621 const MachineOperand &Base = MI.getOperand(OpIdx++);
1622 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1624 // If there is a non-zero immediate offset, encode it.
1626 const MachineOperand &Offset = MI.getOperand(OpIdx);
1627 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1628 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1629 Binary |= 1 << ARMII::U_BitShift;
1636 // If immediate offset is omitted, default to +0.
1637 Binary |= 1 << ARMII::U_BitShift;
1643 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1644 const TargetInstrDesc &TID = MI.getDesc();
1645 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1647 // Part of binary is determined by TableGn.
1648 unsigned Binary = getBinaryCodeForInstr(MI);
1650 // Set the conditional execution predicate
1651 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1653 // Skip operand 0 of an instruction with base register update.
1658 // Set base address operand
1659 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1661 // Set addressing mode by modifying bits U(23) and P(24)
1662 ARM_AM::AMSubMode Mode = ARM_AM::getLoadStoreMultipleSubMode(MI.getOpcode());
1663 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(Mode));
1667 Binary |= 0x1 << ARMII::W_BitShift;
1669 // First register is encoded in Dd.
1670 Binary |= encodeVFPRd(MI, OpIdx+2);
1672 // Count the number of registers.
1673 unsigned NumRegs = 1;
1674 for (unsigned i = OpIdx+3, e = MI.getNumOperands(); i != e; ++i) {
1675 const MachineOperand &MO = MI.getOperand(i);
1676 if (!MO.isReg() || MO.isImplicit())
1680 // Bit 8 will be set if <list> is consecutive 64-bit registers (e.g., D0)
1681 // Otherwise, it will be 0, in the case of 32-bit registers.
1683 Binary |= NumRegs * 2;
1690 static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
1691 unsigned RegD = MI.getOperand(OpIdx).getReg();
1692 unsigned Binary = 0;
1693 RegD = getARMRegisterNumbering(RegD);
1694 Binary |= (RegD & 0xf) << ARMII::RegRdShift;
1695 Binary |= ((RegD >> 4) & 1) << ARMII::D_BitShift;
1699 static unsigned encodeNEONRn(const MachineInstr &MI, unsigned OpIdx) {
1700 unsigned RegN = MI.getOperand(OpIdx).getReg();
1701 unsigned Binary = 0;
1702 RegN = getARMRegisterNumbering(RegN);
1703 Binary |= (RegN & 0xf) << ARMII::RegRnShift;
1704 Binary |= ((RegN >> 4) & 1) << ARMII::N_BitShift;
1708 static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
1709 unsigned RegM = MI.getOperand(OpIdx).getReg();
1710 unsigned Binary = 0;
1711 RegM = getARMRegisterNumbering(RegM);
1712 Binary |= (RegM & 0xf);
1713 Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
1717 /// convertNEONDataProcToThumb - Convert the ARM mode encoding for a NEON
1718 /// data-processing instruction to the corresponding Thumb encoding.
1719 static unsigned convertNEONDataProcToThumb(unsigned Binary) {
1720 assert((Binary & 0xfe000000) == 0xf2000000 &&
1721 "not an ARM NEON data-processing instruction");
1722 unsigned UBit = (Binary >> 24) & 1;
1723 return 0xef000000 | (UBit << 28) | (Binary & 0xffffff);
1726 void ARMCodeEmitter::emitNEONLaneInstruction(const MachineInstr &MI) {
1727 unsigned Binary = getBinaryCodeForInstr(MI);
1729 unsigned RegTOpIdx, RegNOpIdx, LnOpIdx;
1730 const TargetInstrDesc &TID = MI.getDesc();
1731 if ((TID.TSFlags & ARMII::FormMask) == ARMII::NGetLnFrm) {
1735 } else { // ARMII::NSetLnFrm
1741 // Set the conditional execution predicate
1742 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1744 unsigned RegT = MI.getOperand(RegTOpIdx).getReg();
1745 RegT = getARMRegisterNumbering(RegT);
1746 Binary |= (RegT << ARMII::RegRdShift);
1747 Binary |= encodeNEONRn(MI, RegNOpIdx);
1750 if ((Binary & (1 << 22)) != 0)
1751 LaneShift = 0; // 8-bit elements
1752 else if ((Binary & (1 << 5)) != 0)
1753 LaneShift = 1; // 16-bit elements
1755 LaneShift = 2; // 32-bit elements
1757 unsigned Lane = MI.getOperand(LnOpIdx).getImm() << LaneShift;
1758 unsigned Opc1 = Lane >> 2;
1759 unsigned Opc2 = Lane & 3;
1760 assert((Opc1 & 3) == 0 && "out-of-range lane number operand");
1761 Binary |= (Opc1 << 21);
1762 Binary |= (Opc2 << 5);
1767 void ARMCodeEmitter::emitNEONDupInstruction(const MachineInstr &MI) {
1768 unsigned Binary = getBinaryCodeForInstr(MI);
1770 // Set the conditional execution predicate
1771 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1773 unsigned RegT = MI.getOperand(1).getReg();
1774 RegT = getARMRegisterNumbering(RegT);
1775 Binary |= (RegT << ARMII::RegRdShift);
1776 Binary |= encodeNEONRn(MI, 0);
1780 void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
1781 unsigned Binary = getBinaryCodeForInstr(MI);
1782 // Destination register is encoded in Dd.
1783 Binary |= encodeNEONRd(MI, 0);
1784 // Immediate fields: Op, Cmode, I, Imm3, Imm4
1785 unsigned Imm = MI.getOperand(1).getImm();
1786 unsigned Op = (Imm >> 12) & 1;
1787 unsigned Cmode = (Imm >> 8) & 0xf;
1788 unsigned I = (Imm >> 7) & 1;
1789 unsigned Imm3 = (Imm >> 4) & 0x7;
1790 unsigned Imm4 = Imm & 0xf;
1791 Binary |= (I << 24) | (Imm3 << 16) | (Cmode << 8) | (Op << 5) | Imm4;
1793 Binary = convertNEONDataProcToThumb(Binary);
1797 void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
1798 const TargetInstrDesc &TID = MI.getDesc();
1799 unsigned Binary = getBinaryCodeForInstr(MI);
1800 // Destination register is encoded in Dd; source register in Dm.
1802 Binary |= encodeNEONRd(MI, OpIdx++);
1803 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1805 Binary |= encodeNEONRm(MI, OpIdx);
1807 Binary = convertNEONDataProcToThumb(Binary);
1808 // FIXME: This does not handle VDUPfdf or VDUPfqf.
1812 void ARMCodeEmitter::emitNEON3RegInstruction(const MachineInstr &MI) {
1813 const TargetInstrDesc &TID = MI.getDesc();
1814 unsigned Binary = getBinaryCodeForInstr(MI);
1815 // Destination register is encoded in Dd; source registers in Dn and Dm.
1817 Binary |= encodeNEONRd(MI, OpIdx++);
1818 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1820 Binary |= encodeNEONRn(MI, OpIdx++);
1821 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1823 Binary |= encodeNEONRm(MI, OpIdx);
1825 Binary = convertNEONDataProcToThumb(Binary);
1826 // FIXME: This does not handle VMOVDneon or VMOVQ.
1830 #include "ARMGenCodeEmitter.inc"