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);
105 unsigned getAddrModeSBit(const MachineInstr &MI,
106 const TargetInstrDesc &TID) const;
108 void emitDataProcessingInstruction(const MachineInstr &MI,
109 unsigned ImplicitRd = 0,
110 unsigned ImplicitRn = 0);
112 void emitLoadStoreInstruction(const MachineInstr &MI,
113 unsigned ImplicitRd = 0,
114 unsigned ImplicitRn = 0);
116 void emitMiscLoadStoreInstruction(const MachineInstr &MI,
117 unsigned ImplicitRn = 0);
119 void emitLoadStoreMultipleInstruction(const MachineInstr &MI);
121 void emitMulFrmInstruction(const MachineInstr &MI);
123 void emitExtendInstruction(const MachineInstr &MI);
125 void emitMiscArithInstruction(const MachineInstr &MI);
127 void emitSaturateInstruction(const MachineInstr &MI);
129 void emitBranchInstruction(const MachineInstr &MI);
131 void emitInlineJumpTable(unsigned JTIndex);
133 void emitMiscBranchInstruction(const MachineInstr &MI);
135 void emitVFPArithInstruction(const MachineInstr &MI);
137 void emitVFPConversionInstruction(const MachineInstr &MI);
139 void emitVFPLoadStoreInstruction(const MachineInstr &MI);
141 void emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI);
143 void emitMiscInstruction(const MachineInstr &MI);
145 void emitNEONLaneInstruction(const MachineInstr &MI);
146 void emitNEONDupInstruction(const MachineInstr &MI);
147 void emitNEON1RegModImmInstruction(const MachineInstr &MI);
148 void emitNEON2RegInstruction(const MachineInstr &MI);
149 void emitNEON3RegInstruction(const MachineInstr &MI);
151 /// getMachineOpValue - Return binary encoding of operand. If the machine
152 /// operand requires relocation, record the relocation and return zero.
153 unsigned getMachineOpValue(const MachineInstr &MI,
154 const MachineOperand &MO) const;
155 unsigned getMachineOpValue(const MachineInstr &MI, unsigned OpIdx) const {
156 return getMachineOpValue(MI, MI.getOperand(OpIdx));
159 // FIXME: The legacy JIT ARMCodeEmitter doesn't rely on the the
160 // TableGen'erated getBinaryCodeForInstr() function to encode any
161 // operand values, instead querying getMachineOpValue() directly for
162 // each operand it needs to encode. Thus, any of the new encoder
163 // helper functions can simply return 0 as the values the return
164 // are already handled elsewhere. They are placeholders to allow this
165 // encoder to continue to function until the MC encoder is sufficiently
166 // far along that this one can be eliminated entirely.
167 unsigned getCCOutOpValue(const MachineInstr &MI, unsigned Op)
170 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
171 /// machine operand requires relocation, record the relocation and return
173 unsigned getMovi32Value(const MachineInstr &MI,const MachineOperand &MO,
176 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
178 unsigned getShiftOp(unsigned Imm) const ;
180 /// Routines that handle operands which add machine relocations which are
181 /// fixed up by the relocation stage.
182 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
183 bool MayNeedFarStub, bool Indirect,
184 intptr_t ACPV = 0) const;
185 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
186 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
187 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
188 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
189 intptr_t JTBase = 0) const;
193 char ARMCodeEmitter::ID = 0;
195 /// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
196 /// code to the specified MCE object.
197 FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
198 JITCodeEmitter &JCE) {
199 return new ARMCodeEmitter(TM, JCE);
202 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
203 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
204 MF.getTarget().getRelocationModel() != Reloc::Static) &&
205 "JIT relocation model must be set to static or default!");
206 JTI = ((ARMTargetMachine &)MF.getTarget()).getJITInfo();
207 II = ((const ARMTargetMachine &)MF.getTarget()).getInstrInfo();
208 TD = ((const ARMTargetMachine &)MF.getTarget()).getTargetData();
209 Subtarget = &TM.getSubtarget<ARMSubtarget>();
210 MCPEs = &MF.getConstantPool()->getConstants();
212 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
213 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
214 IsThumb = MF.getInfo<ARMFunctionInfo>()->isThumbFunction();
215 JTI->Initialize(MF, IsPIC);
216 MMI = &getAnalysis<MachineModuleInfo>();
217 MCE.setModuleInfo(MMI);
220 DEBUG(errs() << "JITTing function '"
221 << MF.getFunction()->getName() << "'\n");
222 MCE.startFunction(MF);
223 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
225 MCE.StartMachineBasicBlock(MBB);
226 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
230 } while (MCE.finishFunction(MF));
235 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
237 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
238 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
239 default: llvm_unreachable("Unknown shift opc!");
240 case ARM_AM::asr: return 2;
241 case ARM_AM::lsl: return 0;
242 case ARM_AM::lsr: return 1;
244 case ARM_AM::rrx: return 3;
249 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
250 /// machine operand requires relocation, record the relocation and return zero.
251 unsigned ARMCodeEmitter::getMovi32Value(const MachineInstr &MI,
252 const MachineOperand &MO,
254 assert(((Reloc == ARM::reloc_arm_movt) || (Reloc == ARM::reloc_arm_movw))
255 && "Relocation to this function should be for movt or movw");
258 return static_cast<unsigned>(MO.getImm());
259 else if (MO.isGlobal())
260 emitGlobalAddress(MO.getGlobal(), Reloc, true, false);
261 else if (MO.isSymbol())
262 emitExternalSymbolAddress(MO.getSymbolName(), Reloc);
264 emitMachineBasicBlock(MO.getMBB(), Reloc);
269 llvm_unreachable("Unsupported operand type for movw/movt");
274 /// getMachineOpValue - Return binary encoding of operand. If the machine
275 /// operand requires relocation, record the relocation and return zero.
276 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
277 const MachineOperand &MO) const {
279 return getARMRegisterNumbering(MO.getReg());
281 return static_cast<unsigned>(MO.getImm());
282 else if (MO.isGlobal())
283 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
284 else if (MO.isSymbol())
285 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
286 else if (MO.isCPI()) {
287 const TargetInstrDesc &TID = MI.getDesc();
288 // For VFP load, the immediate offset is multiplied by 4.
289 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
290 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
291 emitConstPoolAddress(MO.getIndex(), Reloc);
292 } else if (MO.isJTI())
293 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
295 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
305 /// emitGlobalAddress - Emit the specified address to the code stream.
307 void ARMCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
308 bool MayNeedFarStub, bool Indirect,
309 intptr_t ACPV) const {
310 MachineRelocation MR = Indirect
311 ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
312 const_cast<GlobalValue *>(GV),
313 ACPV, MayNeedFarStub)
314 : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
315 const_cast<GlobalValue *>(GV), ACPV,
317 MCE.addRelocation(MR);
320 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
321 /// be emitted to the current location in the function, and allow it to be PC
323 void ARMCodeEmitter::
324 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
325 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
329 /// emitConstPoolAddress - Arrange for the address of an constant pool
330 /// to be emitted to the current location in the function, and allow it to be PC
332 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
333 // Tell JIT emitter we'll resolve the address.
334 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
335 Reloc, CPI, 0, true));
338 /// emitJumpTableAddress - Arrange for the address of a jump table to
339 /// be emitted to the current location in the function, and allow it to be PC
341 void ARMCodeEmitter::
342 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
343 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
344 Reloc, JTIndex, 0, true));
347 /// emitMachineBasicBlock - Emit the specified address basic block.
348 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
350 intptr_t JTBase) const {
351 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
355 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
356 DEBUG(errs() << " 0x";
357 errs().write_hex(Binary) << "\n");
358 MCE.emitWordLE(Binary);
361 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
362 DEBUG(errs() << " 0x";
363 errs().write_hex(Binary) << "\n");
364 MCE.emitDWordLE(Binary);
367 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
368 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
370 MCE.processDebugLoc(MI.getDebugLoc(), true);
372 ++NumEmitted; // Keep track of the # of mi's emitted
373 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
375 llvm_unreachable("Unhandled instruction encoding format!");
379 emitPseudoInstruction(MI);
382 case ARMII::DPSoRegFrm:
383 emitDataProcessingInstruction(MI);
387 emitLoadStoreInstruction(MI);
389 case ARMII::LdMiscFrm:
390 case ARMII::StMiscFrm:
391 emitMiscLoadStoreInstruction(MI);
393 case ARMII::LdStMulFrm:
394 emitLoadStoreMultipleInstruction(MI);
397 emitMulFrmInstruction(MI);
400 emitExtendInstruction(MI);
402 case ARMII::ArithMiscFrm:
403 emitMiscArithInstruction(MI);
406 emitSaturateInstruction(MI);
409 emitBranchInstruction(MI);
411 case ARMII::BrMiscFrm:
412 emitMiscBranchInstruction(MI);
415 case ARMII::VFPUnaryFrm:
416 case ARMII::VFPBinaryFrm:
417 emitVFPArithInstruction(MI);
419 case ARMII::VFPConv1Frm:
420 case ARMII::VFPConv2Frm:
421 case ARMII::VFPConv3Frm:
422 case ARMII::VFPConv4Frm:
423 case ARMII::VFPConv5Frm:
424 emitVFPConversionInstruction(MI);
426 case ARMII::VFPLdStFrm:
427 emitVFPLoadStoreInstruction(MI);
429 case ARMII::VFPLdStMulFrm:
430 emitVFPLoadStoreMultipleInstruction(MI);
432 case ARMII::VFPMiscFrm:
433 emitMiscInstruction(MI);
435 // NEON instructions.
436 case ARMII::NGetLnFrm:
437 case ARMII::NSetLnFrm:
438 emitNEONLaneInstruction(MI);
441 emitNEONDupInstruction(MI);
443 case ARMII::N1RegModImmFrm:
444 emitNEON1RegModImmInstruction(MI);
446 case ARMII::N2RegFrm:
447 emitNEON2RegInstruction(MI);
449 case ARMII::N3RegFrm:
450 emitNEON3RegInstruction(MI);
453 MCE.processDebugLoc(MI.getDebugLoc(), false);
456 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
457 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
458 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
459 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
461 // Remember the CONSTPOOL_ENTRY address for later relocation.
462 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
464 // Emit constpool island entry. In most cases, the actual values will be
465 // resolved and relocated after code emission.
466 if (MCPE.isMachineConstantPoolEntry()) {
467 ARMConstantPoolValue *ACPV =
468 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
470 DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
471 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
473 assert(ACPV->isGlobalValue() && "unsupported constant pool value");
474 const GlobalValue *GV = ACPV->getGV();
476 Reloc::Model RelocM = TM.getRelocationModel();
477 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
479 Subtarget->GVIsIndirectSymbol(GV, RelocM),
482 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
486 const Constant *CV = MCPE.Val.ConstVal;
489 errs() << " ** Constant pool #" << CPI << " @ "
490 << (void*)MCE.getCurrentPCValue() << " ";
491 if (const Function *F = dyn_cast<Function>(CV))
492 errs() << F->getName();
498 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
499 emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
501 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
502 uint32_t Val = *(uint32_t*)CI->getValue().getRawData();
504 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
505 if (CFP->getType()->isFloatTy())
506 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
507 else if (CFP->getType()->isDoubleTy())
508 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
510 llvm_unreachable("Unable to handle this constantpool entry!");
513 llvm_unreachable("Unable to handle this constantpool entry!");
518 void ARMCodeEmitter::emitMOVi32immInstruction(const MachineInstr &MI) {
519 const MachineOperand &MO0 = MI.getOperand(0);
520 const MachineOperand &MO1 = MI.getOperand(1);
522 // Emit the 'movw' instruction.
523 unsigned Binary = 0x30 << 20; // mov: Insts{27-20} = 0b00110000
525 unsigned Lo16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movw) & 0xFFFF;
527 // Set the conditional execution predicate.
528 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
531 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
533 // Encode imm16 as imm4:imm12
534 Binary |= Lo16 & 0xFFF; // Insts{11-0} = imm12
535 Binary |= ((Lo16 >> 12) & 0xF) << 16; // Insts{19-16} = imm4
538 unsigned Hi16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movt) >> 16;
539 // Emit the 'movt' instruction.
540 Binary = 0x34 << 20; // movt: Insts{27-20} = 0b00110100
542 // Set the conditional execution predicate.
543 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
546 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
548 // Encode imm16 as imm4:imm1, same as movw above.
549 Binary |= Hi16 & 0xFFF;
550 Binary |= ((Hi16 >> 12) & 0xF) << 16;
554 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
555 const MachineOperand &MO0 = MI.getOperand(0);
556 const MachineOperand &MO1 = MI.getOperand(1);
557 assert(MO1.isImm() && ARM_AM::isSOImmTwoPartVal(MO1.getImm()) &&
558 "Not a valid so_imm value!");
559 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
560 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
562 // Emit the 'mov' instruction.
563 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
565 // Set the conditional execution predicate.
566 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
569 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
572 // Set bit I(25) to identify this is the immediate form of <shifter_op>
573 Binary |= 1 << ARMII::I_BitShift;
574 Binary |= getMachineSoImmOpValue(V1);
577 // Now the 'orr' instruction.
578 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
580 // Set the conditional execution predicate.
581 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
584 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
587 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
590 // Set bit I(25) to identify this is the immediate form of <shifter_op>
591 Binary |= 1 << ARMII::I_BitShift;
592 Binary |= getMachineSoImmOpValue(V2);
596 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
597 // It's basically add r, pc, (LJTI - $+8)
599 const TargetInstrDesc &TID = MI.getDesc();
601 // Emit the 'add' instruction.
602 unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
604 // Set the conditional execution predicate
605 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
607 // Encode S bit if MI modifies CPSR.
608 Binary |= getAddrModeSBit(MI, TID);
611 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
613 // Encode Rn which is PC.
614 Binary |= getARMRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
616 // Encode the displacement.
617 Binary |= 1 << ARMII::I_BitShift;
618 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
623 void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
624 unsigned Opcode = MI.getDesc().Opcode;
626 // Part of binary is determined by TableGn.
627 unsigned Binary = getBinaryCodeForInstr(MI);
629 // Set the conditional execution predicate
630 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
632 // Encode S bit if MI modifies CPSR.
633 if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
634 Binary |= 1 << ARMII::S_BitShift;
636 // Encode register def if there is one.
637 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
639 // Encode the shift operation.
646 case ARM::MOVsrl_flag:
648 Binary |= (0x2 << 4) | (1 << 7);
650 case ARM::MOVsra_flag:
652 Binary |= (0x4 << 4) | (1 << 7);
656 // Encode register Rm.
657 Binary |= getMachineOpValue(MI, 1);
662 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
663 DEBUG(errs() << " ** LPC" << LabelID << " @ "
664 << (void*)MCE.getCurrentPCValue() << '\n');
665 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
668 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
669 unsigned Opcode = MI.getDesc().Opcode;
672 llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
676 case ARM::BMOVPCRXr9: {
677 // First emit mov lr, pc
678 unsigned Binary = 0x01a0e00f;
679 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
682 // and then emit the branch.
683 emitMiscBranchInstruction(MI);
686 case TargetOpcode::INLINEASM: {
687 // We allow inline assembler nodes with empty bodies - they can
688 // implicitly define registers, which is ok for JIT.
689 if (MI.getOperand(0).getSymbolName()[0]) {
690 report_fatal_error("JIT does not support inline asm!");
694 case TargetOpcode::PROLOG_LABEL:
695 case TargetOpcode::EH_LABEL:
696 MCE.emitLabel(MI.getOperand(0).getMCSymbol());
698 case TargetOpcode::IMPLICIT_DEF:
699 case TargetOpcode::KILL:
702 case ARM::CONSTPOOL_ENTRY:
703 emitConstPoolInstruction(MI);
706 // Remember of the address of the PC label for relocation later.
707 addPCLabel(MI.getOperand(2).getImm());
708 // PICADD is just an add instruction that implicitly read pc.
709 emitDataProcessingInstruction(MI, 0, ARM::PC);
716 // Remember of the address of the PC label for relocation later.
717 addPCLabel(MI.getOperand(2).getImm());
718 // These are just load / store instructions that implicitly read pc.
719 emitLoadStoreInstruction(MI, 0, ARM::PC);
726 // Remember of the address of the PC label for relocation later.
727 addPCLabel(MI.getOperand(2).getImm());
728 // These are just load / store instructions that implicitly read pc.
729 emitMiscLoadStoreInstruction(MI, ARM::PC);
734 emitMOVi32immInstruction(MI);
737 case ARM::MOVi2pieces:
738 // Two instructions to materialize a constant.
739 emitMOVi2piecesInstruction(MI);
741 case ARM::LEApcrelJT:
742 // Materialize jumptable address.
743 emitLEApcrelJTInstruction(MI);
746 case ARM::MOVsrl_flag:
747 case ARM::MOVsra_flag:
748 emitPseudoMoveInstruction(MI);
753 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
754 const TargetInstrDesc &TID,
755 const MachineOperand &MO,
757 unsigned Binary = getMachineOpValue(MI, MO);
759 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
760 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
761 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
763 // Encode the shift opcode.
765 unsigned Rs = MO1.getReg();
767 // Set shift operand (bit[7:4]).
772 // RRX - 0110 and bit[11:8] clear.
774 default: llvm_unreachable("Unknown shift opc!");
775 case ARM_AM::lsl: SBits = 0x1; break;
776 case ARM_AM::lsr: SBits = 0x3; break;
777 case ARM_AM::asr: SBits = 0x5; break;
778 case ARM_AM::ror: SBits = 0x7; break;
779 case ARM_AM::rrx: SBits = 0x6; break;
782 // Set shift operand (bit[6:4]).
788 default: llvm_unreachable("Unknown shift opc!");
789 case ARM_AM::lsl: SBits = 0x0; break;
790 case ARM_AM::lsr: SBits = 0x2; break;
791 case ARM_AM::asr: SBits = 0x4; break;
792 case ARM_AM::ror: SBits = 0x6; break;
795 Binary |= SBits << 4;
796 if (SOpc == ARM_AM::rrx)
799 // Encode the shift operation Rs or shift_imm (except rrx).
801 // Encode Rs bit[11:8].
802 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
803 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
806 // Encode shift_imm bit[11:7].
807 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
810 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
811 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
812 assert(SoImmVal != -1 && "Not a valid so_imm value!");
814 // Encode rotate_imm.
815 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
816 << ARMII::SoRotImmShift;
819 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
823 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
824 const TargetInstrDesc &TID) const {
825 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
826 const MachineOperand &MO = MI.getOperand(i-1);
827 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
828 return 1 << ARMII::S_BitShift;
833 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
835 unsigned ImplicitRn) {
836 const TargetInstrDesc &TID = MI.getDesc();
838 // Part of binary is determined by TableGn.
839 unsigned Binary = getBinaryCodeForInstr(MI);
841 // Set the conditional execution predicate
842 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
844 // Encode S bit if MI modifies CPSR.
845 Binary |= getAddrModeSBit(MI, TID);
847 // Encode register def if there is one.
848 unsigned NumDefs = TID.getNumDefs();
851 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
853 // Special handling for implicit use (e.g. PC).
854 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
856 if (TID.Opcode == ARM::MOVi16) {
857 // Get immediate from MI.
858 unsigned Lo16 = getMovi32Value(MI, MI.getOperand(OpIdx),
859 ARM::reloc_arm_movw);
860 // Encode imm which is the same as in emitMOVi32immInstruction().
861 Binary |= Lo16 & 0xFFF;
862 Binary |= ((Lo16 >> 12) & 0xF) << 16;
865 } else if(TID.Opcode == ARM::MOVTi16) {
866 unsigned Hi16 = (getMovi32Value(MI, MI.getOperand(OpIdx),
867 ARM::reloc_arm_movt) >> 16);
868 Binary |= Hi16 & 0xFFF;
869 Binary |= ((Hi16 >> 12) & 0xF) << 16;
872 } else if ((TID.Opcode == ARM::BFC) || (TID.Opcode == ARM::BFI)) {
873 uint32_t v = ~MI.getOperand(2).getImm();
874 int32_t lsb = CountTrailingZeros_32(v);
875 int32_t msb = (32 - CountLeadingZeros_32(v)) - 1;
876 // Instr{20-16} = msb, Instr{11-7} = lsb
877 Binary |= (msb & 0x1F) << 16;
878 Binary |= (lsb & 0x1F) << 7;
881 } else if ((TID.Opcode == ARM::UBFX) || (TID.Opcode == ARM::SBFX)) {
882 // Encode Rn in Instr{0-3}
883 Binary |= getMachineOpValue(MI, OpIdx++);
885 uint32_t lsb = MI.getOperand(OpIdx++).getImm();
886 uint32_t widthm1 = MI.getOperand(OpIdx++).getImm() - 1;
888 // Instr{20-16} = widthm1, Instr{11-7} = lsb
889 Binary |= (widthm1 & 0x1F) << 16;
890 Binary |= (lsb & 0x1F) << 7;
895 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
896 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
899 // Encode first non-shifter register operand if there is one.
900 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
903 // Special handling for implicit use (e.g. PC).
904 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
906 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
911 // Encode shifter operand.
912 const MachineOperand &MO = MI.getOperand(OpIdx);
913 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
915 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
920 // Encode register Rm.
921 emitWordLE(Binary | getARMRegisterNumbering(MO.getReg()));
926 Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
931 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
933 unsigned ImplicitRn) {
934 const TargetInstrDesc &TID = MI.getDesc();
935 unsigned Form = TID.TSFlags & ARMII::FormMask;
936 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
938 // Part of binary is determined by TableGn.
939 unsigned Binary = getBinaryCodeForInstr(MI);
941 // Set the conditional execution predicate
942 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
946 // Operand 0 of a pre- and post-indexed store is the address base
947 // writeback. Skip it.
948 bool Skipped = false;
949 if (IsPrePost && Form == ARMII::StFrm) {
956 // Special handling for implicit use (e.g. PC).
957 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
959 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
961 // Set second operand
963 // Special handling for implicit use (e.g. PC).
964 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
966 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
968 // If this is a two-address operand, skip it. e.g. LDR_PRE.
969 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
972 const MachineOperand &MO2 = MI.getOperand(OpIdx);
973 unsigned AM2Opc = (ImplicitRn == ARM::PC)
974 ? 0 : MI.getOperand(OpIdx+1).getImm();
976 // Set bit U(23) according to sign of immed value (positive or negative).
977 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
979 if (!MO2.getReg()) { // is immediate
980 if (ARM_AM::getAM2Offset(AM2Opc))
981 // Set the value of offset_12 field
982 Binary |= ARM_AM::getAM2Offset(AM2Opc);
987 // Set bit I(25), because this is not in immediate enconding.
988 Binary |= 1 << ARMII::I_BitShift;
989 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
990 // Set bit[3:0] to the corresponding Rm register
991 Binary |= getARMRegisterNumbering(MO2.getReg());
993 // If this instr is in scaled register offset/index instruction, set
994 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
995 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
996 Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
997 Binary |= ShImm << ARMII::ShiftShift; // shift_immed
1003 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
1004 unsigned ImplicitRn) {
1005 const TargetInstrDesc &TID = MI.getDesc();
1006 unsigned Form = TID.TSFlags & ARMII::FormMask;
1007 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1009 // Part of binary is determined by TableGn.
1010 unsigned Binary = getBinaryCodeForInstr(MI);
1012 // Set the conditional execution predicate
1013 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1017 // Operand 0 of a pre- and post-indexed store is the address base
1018 // writeback. Skip it.
1019 bool Skipped = false;
1020 if (IsPrePost && Form == ARMII::StMiscFrm) {
1025 // Set first operand
1026 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1028 // Skip LDRD and STRD's second operand.
1029 if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
1032 // Set second operand
1034 // Special handling for implicit use (e.g. PC).
1035 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1037 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1039 // If this is a two-address operand, skip it. e.g. LDRH_POST.
1040 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1043 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1044 unsigned AM3Opc = (ImplicitRn == ARM::PC)
1045 ? 0 : MI.getOperand(OpIdx+1).getImm();
1047 // Set bit U(23) according to sign of immed value (positive or negative)
1048 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
1051 // If this instr is in register offset/index encoding, set bit[3:0]
1052 // to the corresponding Rm register.
1054 Binary |= getARMRegisterNumbering(MO2.getReg());
1059 // This instr is in immediate offset/index encoding, set bit 22 to 1.
1060 Binary |= 1 << ARMII::AM3_I_BitShift;
1061 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
1063 Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
1064 Binary |= (ImmOffs & 0xF); // immedL
1070 static unsigned getAddrModeUPBits(unsigned Mode) {
1071 unsigned Binary = 0;
1073 // Set addressing mode by modifying bits U(23) and P(24)
1074 // IA - Increment after - bit U = 1 and bit P = 0
1075 // IB - Increment before - bit U = 1 and bit P = 1
1076 // DA - Decrement after - bit U = 0 and bit P = 0
1077 // DB - Decrement before - bit U = 0 and bit P = 1
1079 default: llvm_unreachable("Unknown addressing sub-mode!");
1080 case ARM_AM::da: break;
1081 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
1082 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
1083 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
1089 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
1090 const TargetInstrDesc &TID = MI.getDesc();
1091 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1093 // Part of binary is determined by TableGn.
1094 unsigned Binary = getBinaryCodeForInstr(MI);
1096 // Set the conditional execution predicate
1097 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1099 // Skip operand 0 of an instruction with base register update.
1104 // Set base address operand
1105 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1107 // Set addressing mode by modifying bits U(23) and P(24)
1108 const MachineOperand &MO = MI.getOperand(OpIdx++);
1109 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1113 Binary |= 0x1 << ARMII::W_BitShift;
1116 for (unsigned i = OpIdx+2, e = MI.getNumOperands(); i != e; ++i) {
1117 const MachineOperand &MO = MI.getOperand(i);
1118 if (!MO.isReg() || MO.isImplicit())
1120 unsigned RegNum = getARMRegisterNumbering(MO.getReg());
1121 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
1123 Binary |= 0x1 << RegNum;
1129 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
1130 const TargetInstrDesc &TID = MI.getDesc();
1132 // Part of binary is determined by TableGn.
1133 unsigned Binary = getBinaryCodeForInstr(MI);
1135 // Set the conditional execution predicate
1136 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1138 // Encode S bit if MI modifies CPSR.
1139 Binary |= getAddrModeSBit(MI, TID);
1141 // 32x32->64bit operations have two destination registers. The number
1142 // of register definitions will tell us if that's what we're dealing with.
1144 if (TID.getNumDefs() == 2)
1145 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
1148 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
1151 Binary |= getMachineOpValue(MI, OpIdx++);
1154 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
1156 // Many multiple instructions (e.g. MLA) have three src operands. Encode
1157 // it as Rn (for multiply, that's in the same offset as RdLo.
1158 if (TID.getNumOperands() > OpIdx &&
1159 !TID.OpInfo[OpIdx].isPredicate() &&
1160 !TID.OpInfo[OpIdx].isOptionalDef())
1161 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
1166 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
1167 const TargetInstrDesc &TID = MI.getDesc();
1169 // Part of binary is determined by TableGn.
1170 unsigned Binary = getBinaryCodeForInstr(MI);
1172 // Set the conditional execution predicate
1173 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1178 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1180 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1181 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1183 // Two register operand form.
1185 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1188 Binary |= getMachineOpValue(MI, MO2);
1191 Binary |= getMachineOpValue(MI, MO1);
1194 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1195 if (MI.getOperand(OpIdx).isImm() &&
1196 !TID.OpInfo[OpIdx].isPredicate() &&
1197 !TID.OpInfo[OpIdx].isOptionalDef())
1198 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1203 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1204 const TargetInstrDesc &TID = MI.getDesc();
1206 // Part of binary is determined by TableGn.
1207 unsigned Binary = getBinaryCodeForInstr(MI);
1209 // Set the conditional execution predicate
1210 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1215 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1217 const MachineOperand &MO = MI.getOperand(OpIdx++);
1218 if (OpIdx == TID.getNumOperands() ||
1219 TID.OpInfo[OpIdx].isPredicate() ||
1220 TID.OpInfo[OpIdx].isOptionalDef()) {
1221 // Encode Rm and it's done.
1222 Binary |= getMachineOpValue(MI, MO);
1228 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1231 Binary |= getMachineOpValue(MI, OpIdx++);
1233 // Encode shift_imm.
1234 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1235 if (TID.Opcode == ARM::PKHTB) {
1236 assert(ShiftAmt != 0 && "PKHTB shift_imm is 0!");
1240 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1241 Binary |= ShiftAmt << ARMII::ShiftShift;
1246 void ARMCodeEmitter::emitSaturateInstruction(const MachineInstr &MI) {
1247 const TargetInstrDesc &TID = MI.getDesc();
1249 // Part of binary is determined by TableGen.
1250 unsigned Binary = getBinaryCodeForInstr(MI);
1252 // Set the conditional execution predicate
1253 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1256 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
1258 // Encode saturate bit position.
1259 unsigned Pos = MI.getOperand(1).getImm();
1260 if (TID.Opcode == ARM::SSAT || TID.Opcode == ARM::SSAT16)
1262 assert((Pos < 16 || (Pos < 32 &&
1263 TID.Opcode != ARM::SSAT16 &&
1264 TID.Opcode != ARM::USAT16)) &&
1265 "saturate bit position out of range");
1266 Binary |= Pos << 16;
1269 Binary |= getMachineOpValue(MI, 2);
1271 // Encode shift_imm.
1272 if (TID.getNumOperands() == 4) {
1273 unsigned ShiftOp = MI.getOperand(3).getImm();
1274 ARM_AM::ShiftOpc Opc = ARM_AM::getSORegShOp(ShiftOp);
1275 if (Opc == ARM_AM::asr)
1277 unsigned ShiftAmt = MI.getOperand(3).getImm();
1278 if (ShiftAmt == 32 && Opc == ARM_AM::asr)
1280 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1281 Binary |= ShiftAmt << ARMII::ShiftShift;
1287 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1288 const TargetInstrDesc &TID = MI.getDesc();
1290 if (TID.Opcode == ARM::TPsoft) {
1291 llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1294 // Part of binary is determined by TableGn.
1295 unsigned Binary = getBinaryCodeForInstr(MI);
1297 // Set the conditional execution predicate
1298 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1300 // Set signed_immed_24 field
1301 Binary |= getMachineOpValue(MI, 0);
1306 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1307 // Remember the base address of the inline jump table.
1308 uintptr_t JTBase = MCE.getCurrentPCValue();
1309 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1310 DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1313 // Now emit the jump table entries.
1314 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1315 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1317 // DestBB address - JT base.
1318 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1320 // Absolute DestBB address.
1321 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1326 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1327 const TargetInstrDesc &TID = MI.getDesc();
1329 // Handle jump tables.
1330 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1331 // First emit a ldr pc, [] instruction.
1332 emitDataProcessingInstruction(MI, ARM::PC);
1334 // Then emit the inline jump table.
1336 (TID.Opcode == ARM::BR_JTr)
1337 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1338 emitInlineJumpTable(JTIndex);
1340 } else if (TID.Opcode == ARM::BR_JTm) {
1341 // First emit a ldr pc, [] instruction.
1342 emitLoadStoreInstruction(MI, ARM::PC);
1344 // Then emit the inline jump table.
1345 emitInlineJumpTable(MI.getOperand(3).getIndex());
1349 // Part of binary is determined by TableGn.
1350 unsigned Binary = getBinaryCodeForInstr(MI);
1352 // Set the conditional execution predicate
1353 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1355 if (TID.Opcode == ARM::BX_RET || TID.Opcode == ARM::MOVPCLR)
1356 // The return register is LR.
1357 Binary |= getARMRegisterNumbering(ARM::LR);
1359 // otherwise, set the return register
1360 Binary |= getMachineOpValue(MI, 0);
1365 static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1366 unsigned RegD = MI.getOperand(OpIdx).getReg();
1367 unsigned Binary = 0;
1368 bool isSPVFP = ARM::SPRRegisterClass->contains(RegD);
1369 RegD = getARMRegisterNumbering(RegD);
1371 Binary |= RegD << ARMII::RegRdShift;
1373 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1374 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1379 static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1380 unsigned RegN = MI.getOperand(OpIdx).getReg();
1381 unsigned Binary = 0;
1382 bool isSPVFP = ARM::SPRRegisterClass->contains(RegN);
1383 RegN = getARMRegisterNumbering(RegN);
1385 Binary |= RegN << ARMII::RegRnShift;
1387 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1388 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1393 static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1394 unsigned RegM = MI.getOperand(OpIdx).getReg();
1395 unsigned Binary = 0;
1396 bool isSPVFP = ARM::SPRRegisterClass->contains(RegM);
1397 RegM = getARMRegisterNumbering(RegM);
1401 Binary |= ((RegM & 0x1E) >> 1);
1402 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1407 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1408 const TargetInstrDesc &TID = MI.getDesc();
1410 // Part of binary is determined by TableGn.
1411 unsigned Binary = getBinaryCodeForInstr(MI);
1413 // Set the conditional execution predicate
1414 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1417 assert((Binary & ARMII::D_BitShift) == 0 &&
1418 (Binary & ARMII::N_BitShift) == 0 &&
1419 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1422 Binary |= encodeVFPRd(MI, OpIdx++);
1424 // If this is a two-address operand, skip it, e.g. FMACD.
1425 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1429 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1430 Binary |= encodeVFPRn(MI, OpIdx++);
1432 if (OpIdx == TID.getNumOperands() ||
1433 TID.OpInfo[OpIdx].isPredicate() ||
1434 TID.OpInfo[OpIdx].isOptionalDef()) {
1435 // FCMPEZD etc. has only one operand.
1441 Binary |= encodeVFPRm(MI, OpIdx);
1446 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1447 const TargetInstrDesc &TID = MI.getDesc();
1448 unsigned Form = TID.TSFlags & ARMII::FormMask;
1450 // Part of binary is determined by TableGn.
1451 unsigned Binary = getBinaryCodeForInstr(MI);
1453 // Set the conditional execution predicate
1454 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1458 case ARMII::VFPConv1Frm:
1459 case ARMII::VFPConv2Frm:
1460 case ARMII::VFPConv3Frm:
1462 Binary |= encodeVFPRd(MI, 0);
1464 case ARMII::VFPConv4Frm:
1466 Binary |= encodeVFPRn(MI, 0);
1468 case ARMII::VFPConv5Frm:
1470 Binary |= encodeVFPRm(MI, 0);
1476 case ARMII::VFPConv1Frm:
1478 Binary |= encodeVFPRm(MI, 1);
1480 case ARMII::VFPConv2Frm:
1481 case ARMII::VFPConv3Frm:
1483 Binary |= encodeVFPRn(MI, 1);
1485 case ARMII::VFPConv4Frm:
1486 case ARMII::VFPConv5Frm:
1488 Binary |= encodeVFPRd(MI, 1);
1492 if (Form == ARMII::VFPConv5Frm)
1494 Binary |= encodeVFPRn(MI, 2);
1495 else if (Form == ARMII::VFPConv3Frm)
1497 Binary |= encodeVFPRm(MI, 2);
1502 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1503 // Part of binary is determined by TableGn.
1504 unsigned Binary = getBinaryCodeForInstr(MI);
1506 // Set the conditional execution predicate
1507 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1512 Binary |= encodeVFPRd(MI, OpIdx++);
1514 // Encode address base.
1515 const MachineOperand &Base = MI.getOperand(OpIdx++);
1516 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1518 // If there is a non-zero immediate offset, encode it.
1520 const MachineOperand &Offset = MI.getOperand(OpIdx);
1521 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1522 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1523 Binary |= 1 << ARMII::U_BitShift;
1530 // If immediate offset is omitted, default to +0.
1531 Binary |= 1 << ARMII::U_BitShift;
1537 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1538 const TargetInstrDesc &TID = MI.getDesc();
1539 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1541 // Part of binary is determined by TableGn.
1542 unsigned Binary = getBinaryCodeForInstr(MI);
1544 // Set the conditional execution predicate
1545 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1547 // Skip operand 0 of an instruction with base register update.
1552 // Set base address operand
1553 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1555 // Set addressing mode by modifying bits U(23) and P(24)
1556 const MachineOperand &MO = MI.getOperand(OpIdx++);
1557 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1561 Binary |= 0x1 << ARMII::W_BitShift;
1563 // First register is encoded in Dd.
1564 Binary |= encodeVFPRd(MI, OpIdx+2);
1566 // Count the number of registers.
1567 unsigned NumRegs = 1;
1568 for (unsigned i = OpIdx+3, e = MI.getNumOperands(); i != e; ++i) {
1569 const MachineOperand &MO = MI.getOperand(i);
1570 if (!MO.isReg() || MO.isImplicit())
1574 // Bit 8 will be set if <list> is consecutive 64-bit registers (e.g., D0)
1575 // Otherwise, it will be 0, in the case of 32-bit registers.
1577 Binary |= NumRegs * 2;
1584 void ARMCodeEmitter::emitMiscInstruction(const MachineInstr &MI) {
1585 unsigned Opcode = MI.getDesc().Opcode;
1586 // Part of binary is determined by TableGn.
1587 unsigned Binary = getBinaryCodeForInstr(MI);
1589 // Set the conditional execution predicate
1590 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1594 llvm_unreachable("ARMCodeEmitter::emitMiscInstruction");
1597 // No further encoding needed.
1602 const MachineOperand &MO0 = MI.getOperand(0);
1604 Binary |= getARMRegisterNumbering(MO0.getReg()) << ARMII::RegRdShift;
1609 case ARM::FCONSTS: {
1611 Binary |= encodeVFPRd(MI, 0);
1613 // Encode imm., Table A7-18 VFP modified immediate constants
1614 const MachineOperand &MO1 = MI.getOperand(1);
1615 unsigned Imm = static_cast<unsigned>(MO1.getFPImm()->getValueAPF()
1616 .bitcastToAPInt().getHiBits(32).getLimitedValue());
1617 unsigned ModifiedImm;
1619 if(Opcode == ARM::FCONSTS)
1620 ModifiedImm = (Imm & 0x80000000) >> 24 | // a
1621 (Imm & 0x03F80000) >> 19; // bcdefgh
1622 else // Opcode == ARM::FCONSTD
1623 ModifiedImm = (Imm & 0x80000000) >> 24 | // a
1624 (Imm & 0x007F0000) >> 16; // bcdefgh
1626 // Insts{19-16} = abcd, Insts{3-0} = efgh
1627 Binary |= ((ModifiedImm & 0xF0) >> 4) << 16;
1628 Binary |= (ModifiedImm & 0xF);
1636 static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
1637 unsigned RegD = MI.getOperand(OpIdx).getReg();
1638 unsigned Binary = 0;
1639 RegD = getARMRegisterNumbering(RegD);
1640 Binary |= (RegD & 0xf) << ARMII::RegRdShift;
1641 Binary |= ((RegD >> 4) & 1) << ARMII::D_BitShift;
1645 static unsigned encodeNEONRn(const MachineInstr &MI, unsigned OpIdx) {
1646 unsigned RegN = MI.getOperand(OpIdx).getReg();
1647 unsigned Binary = 0;
1648 RegN = getARMRegisterNumbering(RegN);
1649 Binary |= (RegN & 0xf) << ARMII::RegRnShift;
1650 Binary |= ((RegN >> 4) & 1) << ARMII::N_BitShift;
1654 static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
1655 unsigned RegM = MI.getOperand(OpIdx).getReg();
1656 unsigned Binary = 0;
1657 RegM = getARMRegisterNumbering(RegM);
1658 Binary |= (RegM & 0xf);
1659 Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
1663 /// convertNEONDataProcToThumb - Convert the ARM mode encoding for a NEON
1664 /// data-processing instruction to the corresponding Thumb encoding.
1665 static unsigned convertNEONDataProcToThumb(unsigned Binary) {
1666 assert((Binary & 0xfe000000) == 0xf2000000 &&
1667 "not an ARM NEON data-processing instruction");
1668 unsigned UBit = (Binary >> 24) & 1;
1669 return 0xef000000 | (UBit << 28) | (Binary & 0xffffff);
1672 void ARMCodeEmitter::emitNEONLaneInstruction(const MachineInstr &MI) {
1673 unsigned Binary = getBinaryCodeForInstr(MI);
1675 unsigned RegTOpIdx, RegNOpIdx, LnOpIdx;
1676 const TargetInstrDesc &TID = MI.getDesc();
1677 if ((TID.TSFlags & ARMII::FormMask) == ARMII::NGetLnFrm) {
1681 } else { // ARMII::NSetLnFrm
1687 // Set the conditional execution predicate
1688 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1690 unsigned RegT = MI.getOperand(RegTOpIdx).getReg();
1691 RegT = getARMRegisterNumbering(RegT);
1692 Binary |= (RegT << ARMII::RegRdShift);
1693 Binary |= encodeNEONRn(MI, RegNOpIdx);
1696 if ((Binary & (1 << 22)) != 0)
1697 LaneShift = 0; // 8-bit elements
1698 else if ((Binary & (1 << 5)) != 0)
1699 LaneShift = 1; // 16-bit elements
1701 LaneShift = 2; // 32-bit elements
1703 unsigned Lane = MI.getOperand(LnOpIdx).getImm() << LaneShift;
1704 unsigned Opc1 = Lane >> 2;
1705 unsigned Opc2 = Lane & 3;
1706 assert((Opc1 & 3) == 0 && "out-of-range lane number operand");
1707 Binary |= (Opc1 << 21);
1708 Binary |= (Opc2 << 5);
1713 void ARMCodeEmitter::emitNEONDupInstruction(const MachineInstr &MI) {
1714 unsigned Binary = getBinaryCodeForInstr(MI);
1716 // Set the conditional execution predicate
1717 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1719 unsigned RegT = MI.getOperand(1).getReg();
1720 RegT = getARMRegisterNumbering(RegT);
1721 Binary |= (RegT << ARMII::RegRdShift);
1722 Binary |= encodeNEONRn(MI, 0);
1726 void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
1727 unsigned Binary = getBinaryCodeForInstr(MI);
1728 // Destination register is encoded in Dd.
1729 Binary |= encodeNEONRd(MI, 0);
1730 // Immediate fields: Op, Cmode, I, Imm3, Imm4
1731 unsigned Imm = MI.getOperand(1).getImm();
1732 unsigned Op = (Imm >> 12) & 1;
1733 unsigned Cmode = (Imm >> 8) & 0xf;
1734 unsigned I = (Imm >> 7) & 1;
1735 unsigned Imm3 = (Imm >> 4) & 0x7;
1736 unsigned Imm4 = Imm & 0xf;
1737 Binary |= (I << 24) | (Imm3 << 16) | (Cmode << 8) | (Op << 5) | Imm4;
1739 Binary = convertNEONDataProcToThumb(Binary);
1743 void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
1744 const TargetInstrDesc &TID = MI.getDesc();
1745 unsigned Binary = getBinaryCodeForInstr(MI);
1746 // Destination register is encoded in Dd; source register in Dm.
1748 Binary |= encodeNEONRd(MI, OpIdx++);
1749 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1751 Binary |= encodeNEONRm(MI, OpIdx);
1753 Binary = convertNEONDataProcToThumb(Binary);
1754 // FIXME: This does not handle VDUPfdf or VDUPfqf.
1758 void ARMCodeEmitter::emitNEON3RegInstruction(const MachineInstr &MI) {
1759 const TargetInstrDesc &TID = MI.getDesc();
1760 unsigned Binary = getBinaryCodeForInstr(MI);
1761 // Destination register is encoded in Dd; source registers in Dn and Dm.
1763 Binary |= encodeNEONRd(MI, OpIdx++);
1764 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1766 Binary |= encodeNEONRn(MI, OpIdx++);
1767 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1769 Binary |= encodeNEONRm(MI, OpIdx);
1771 Binary = convertNEONDataProcToThumb(Binary);
1772 // FIXME: This does not handle VMOVDneon or VMOVQ.
1776 #include "ARMGenCodeEmitter.inc"