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 getCCOutOpValue(const MachineInstr &MI, unsigned Op)
166 unsigned getSOImmOpValue(const MachineInstr &MI, unsigned Op)
168 unsigned getSORegOpValue(const MachineInstr &MI, unsigned Op)
170 unsigned getRotImmOpValue(const MachineInstr &MI, unsigned Op)
172 unsigned getImmMinusOneOpValue(const MachineInstr &MI, unsigned Op)
174 unsigned getAddrMode6AddressOpValue(const MachineInstr &MI, unsigned Op)
176 unsigned getAddrMode6OffsetOpValue(const MachineInstr &MI, unsigned Op)
178 unsigned getBitfieldInvertedMaskOpValue(const MachineInstr &MI,
179 unsigned Op) const { return 0; }
180 uint32_t getLdStmModeOpValue(const MachineInstr &MI, unsigned OpIdx)
182 uint32_t getLdStSORegOpValue(const MachineInstr &MI, unsigned OpIdx)
185 unsigned getAddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
188 // {12} = (U)nsigned (add == '1', sub == '0')
190 const MachineOperand &MO = MI.getOperand(Op);
191 const MachineOperand &MO1 = MI.getOperand(Op + 1);
193 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
196 unsigned Reg = getARMRegisterNumbering(MO.getReg());
197 int32_t Imm12 = MO1.getImm();
199 Binary = Imm12 & 0xfff;
202 Binary |= (Reg << 13);
205 uint32_t getAddrMode5OpValue(const MachineInstr &MI, unsigned Op) const {
207 // {8} = (U)nsigned (add == '1', sub == '0')
209 const MachineOperand &MO = MI.getOperand(Op);
210 const MachineOperand &MO1 = MI.getOperand(Op + 1);
212 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
215 unsigned Reg = getARMRegisterNumbering(MO.getReg());
216 int32_t Imm8 = MO1.getImm();
218 Binary = Imm8 & 0xff;
221 Binary |= (Reg << 9);
224 unsigned getNEONVcvtImm32OpValue(const MachineInstr &MI, unsigned Op)
227 unsigned getRegisterListOpValue(const MachineInstr &MI, unsigned Op)
230 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
231 /// machine operand requires relocation, record the relocation and return
233 unsigned getMovi32Value(const MachineInstr &MI,const MachineOperand &MO,
236 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
238 unsigned getShiftOp(unsigned Imm) const ;
240 /// Routines that handle operands which add machine relocations which are
241 /// fixed up by the relocation stage.
242 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
243 bool MayNeedFarStub, bool Indirect,
244 intptr_t ACPV = 0) const;
245 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
246 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
247 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
248 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
249 intptr_t JTBase = 0) const;
253 char ARMCodeEmitter::ID = 0;
255 /// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
256 /// code to the specified MCE object.
257 FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
258 JITCodeEmitter &JCE) {
259 return new ARMCodeEmitter(TM, JCE);
262 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
263 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
264 MF.getTarget().getRelocationModel() != Reloc::Static) &&
265 "JIT relocation model must be set to static or default!");
266 JTI = ((ARMTargetMachine &)MF.getTarget()).getJITInfo();
267 II = ((const ARMTargetMachine &)MF.getTarget()).getInstrInfo();
268 TD = ((const ARMTargetMachine &)MF.getTarget()).getTargetData();
269 Subtarget = &TM.getSubtarget<ARMSubtarget>();
270 MCPEs = &MF.getConstantPool()->getConstants();
272 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
273 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
274 IsThumb = MF.getInfo<ARMFunctionInfo>()->isThumbFunction();
275 JTI->Initialize(MF, IsPIC);
276 MMI = &getAnalysis<MachineModuleInfo>();
277 MCE.setModuleInfo(MMI);
280 DEBUG(errs() << "JITTing function '"
281 << MF.getFunction()->getName() << "'\n");
282 MCE.startFunction(MF);
283 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
285 MCE.StartMachineBasicBlock(MBB);
286 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
290 } while (MCE.finishFunction(MF));
295 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
297 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
298 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
299 default: llvm_unreachable("Unknown shift opc!");
300 case ARM_AM::asr: return 2;
301 case ARM_AM::lsl: return 0;
302 case ARM_AM::lsr: return 1;
304 case ARM_AM::rrx: return 3;
309 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
310 /// machine operand requires relocation, record the relocation and return zero.
311 unsigned ARMCodeEmitter::getMovi32Value(const MachineInstr &MI,
312 const MachineOperand &MO,
314 assert(((Reloc == ARM::reloc_arm_movt) || (Reloc == ARM::reloc_arm_movw))
315 && "Relocation to this function should be for movt or movw");
318 return static_cast<unsigned>(MO.getImm());
319 else if (MO.isGlobal())
320 emitGlobalAddress(MO.getGlobal(), Reloc, true, false);
321 else if (MO.isSymbol())
322 emitExternalSymbolAddress(MO.getSymbolName(), Reloc);
324 emitMachineBasicBlock(MO.getMBB(), Reloc);
329 llvm_unreachable("Unsupported operand type for movw/movt");
334 /// getMachineOpValue - Return binary encoding of operand. If the machine
335 /// operand requires relocation, record the relocation and return zero.
336 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
337 const MachineOperand &MO) const {
339 return getARMRegisterNumbering(MO.getReg());
341 return static_cast<unsigned>(MO.getImm());
342 else if (MO.isGlobal())
343 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
344 else if (MO.isSymbol())
345 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
346 else if (MO.isCPI()) {
347 const TargetInstrDesc &TID = MI.getDesc();
348 // For VFP load, the immediate offset is multiplied by 4.
349 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
350 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
351 emitConstPoolAddress(MO.getIndex(), Reloc);
352 } else if (MO.isJTI())
353 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
355 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
365 /// emitGlobalAddress - Emit the specified address to the code stream.
367 void ARMCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
368 bool MayNeedFarStub, bool Indirect,
369 intptr_t ACPV) const {
370 MachineRelocation MR = Indirect
371 ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
372 const_cast<GlobalValue *>(GV),
373 ACPV, MayNeedFarStub)
374 : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
375 const_cast<GlobalValue *>(GV), ACPV,
377 MCE.addRelocation(MR);
380 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
381 /// be emitted to the current location in the function, and allow it to be PC
383 void ARMCodeEmitter::
384 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
385 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
389 /// emitConstPoolAddress - Arrange for the address of an constant pool
390 /// to be emitted to the current location in the function, and allow it to be PC
392 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
393 // Tell JIT emitter we'll resolve the address.
394 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
395 Reloc, CPI, 0, true));
398 /// emitJumpTableAddress - Arrange for the address of a jump table to
399 /// be emitted to the current location in the function, and allow it to be PC
401 void ARMCodeEmitter::
402 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
403 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
404 Reloc, JTIndex, 0, true));
407 /// emitMachineBasicBlock - Emit the specified address basic block.
408 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
410 intptr_t JTBase) const {
411 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
415 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
416 DEBUG(errs() << " 0x";
417 errs().write_hex(Binary) << "\n");
418 MCE.emitWordLE(Binary);
421 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
422 DEBUG(errs() << " 0x";
423 errs().write_hex(Binary) << "\n");
424 MCE.emitDWordLE(Binary);
427 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
428 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
430 MCE.processDebugLoc(MI.getDebugLoc(), true);
432 ++NumEmitted; // Keep track of the # of mi's emitted
433 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
435 llvm_unreachable("Unhandled instruction encoding format!");
439 emitPseudoInstruction(MI);
442 case ARMII::DPSoRegFrm:
443 emitDataProcessingInstruction(MI);
447 emitLoadStoreInstruction(MI);
449 case ARMII::LdMiscFrm:
450 case ARMII::StMiscFrm:
451 emitMiscLoadStoreInstruction(MI);
453 case ARMII::LdStMulFrm:
454 emitLoadStoreMultipleInstruction(MI);
457 emitMulFrmInstruction(MI);
460 emitExtendInstruction(MI);
462 case ARMII::ArithMiscFrm:
463 emitMiscArithInstruction(MI);
466 emitSaturateInstruction(MI);
469 emitBranchInstruction(MI);
471 case ARMII::BrMiscFrm:
472 emitMiscBranchInstruction(MI);
475 case ARMII::VFPUnaryFrm:
476 case ARMII::VFPBinaryFrm:
477 emitVFPArithInstruction(MI);
479 case ARMII::VFPConv1Frm:
480 case ARMII::VFPConv2Frm:
481 case ARMII::VFPConv3Frm:
482 case ARMII::VFPConv4Frm:
483 case ARMII::VFPConv5Frm:
484 emitVFPConversionInstruction(MI);
486 case ARMII::VFPLdStFrm:
487 emitVFPLoadStoreInstruction(MI);
489 case ARMII::VFPLdStMulFrm:
490 emitVFPLoadStoreMultipleInstruction(MI);
493 // NEON instructions.
494 case ARMII::NGetLnFrm:
495 case ARMII::NSetLnFrm:
496 emitNEONLaneInstruction(MI);
499 emitNEONDupInstruction(MI);
501 case ARMII::N1RegModImmFrm:
502 emitNEON1RegModImmInstruction(MI);
504 case ARMII::N2RegFrm:
505 emitNEON2RegInstruction(MI);
507 case ARMII::N3RegFrm:
508 emitNEON3RegInstruction(MI);
511 MCE.processDebugLoc(MI.getDebugLoc(), false);
514 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
515 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
516 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
517 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
519 // Remember the CONSTPOOL_ENTRY address for later relocation.
520 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
522 // Emit constpool island entry. In most cases, the actual values will be
523 // resolved and relocated after code emission.
524 if (MCPE.isMachineConstantPoolEntry()) {
525 ARMConstantPoolValue *ACPV =
526 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
528 DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
529 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
531 assert(ACPV->isGlobalValue() && "unsupported constant pool value");
532 const GlobalValue *GV = ACPV->getGV();
534 Reloc::Model RelocM = TM.getRelocationModel();
535 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
537 Subtarget->GVIsIndirectSymbol(GV, RelocM),
540 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
544 const Constant *CV = MCPE.Val.ConstVal;
547 errs() << " ** Constant pool #" << CPI << " @ "
548 << (void*)MCE.getCurrentPCValue() << " ";
549 if (const Function *F = dyn_cast<Function>(CV))
550 errs() << F->getName();
556 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
557 emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
559 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
560 uint32_t Val = uint32_t(*CI->getValue().getRawData());
562 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
563 if (CFP->getType()->isFloatTy())
564 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
565 else if (CFP->getType()->isDoubleTy())
566 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
568 llvm_unreachable("Unable to handle this constantpool entry!");
571 llvm_unreachable("Unable to handle this constantpool entry!");
576 void ARMCodeEmitter::emitMOVi32immInstruction(const MachineInstr &MI) {
577 const MachineOperand &MO0 = MI.getOperand(0);
578 const MachineOperand &MO1 = MI.getOperand(1);
580 // Emit the 'movw' instruction.
581 unsigned Binary = 0x30 << 20; // mov: Insts{27-20} = 0b00110000
583 unsigned Lo16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movw) & 0xFFFF;
585 // Set the conditional execution predicate.
586 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
589 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
591 // Encode imm16 as imm4:imm12
592 Binary |= Lo16 & 0xFFF; // Insts{11-0} = imm12
593 Binary |= ((Lo16 >> 12) & 0xF) << 16; // Insts{19-16} = imm4
596 unsigned Hi16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movt) >> 16;
597 // Emit the 'movt' instruction.
598 Binary = 0x34 << 20; // movt: Insts{27-20} = 0b00110100
600 // Set the conditional execution predicate.
601 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
604 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
606 // Encode imm16 as imm4:imm1, same as movw above.
607 Binary |= Hi16 & 0xFFF;
608 Binary |= ((Hi16 >> 12) & 0xF) << 16;
612 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
613 const MachineOperand &MO0 = MI.getOperand(0);
614 const MachineOperand &MO1 = MI.getOperand(1);
615 assert(MO1.isImm() && ARM_AM::isSOImmTwoPartVal(MO1.getImm()) &&
616 "Not a valid so_imm value!");
617 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
618 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
620 // Emit the 'mov' instruction.
621 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
623 // Set the conditional execution predicate.
624 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
627 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
630 // Set bit I(25) to identify this is the immediate form of <shifter_op>
631 Binary |= 1 << ARMII::I_BitShift;
632 Binary |= getMachineSoImmOpValue(V1);
635 // Now the 'orr' instruction.
636 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
638 // Set the conditional execution predicate.
639 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
642 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
645 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
648 // Set bit I(25) to identify this is the immediate form of <shifter_op>
649 Binary |= 1 << ARMII::I_BitShift;
650 Binary |= getMachineSoImmOpValue(V2);
654 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
655 // It's basically add r, pc, (LJTI - $+8)
657 const TargetInstrDesc &TID = MI.getDesc();
659 // Emit the 'add' instruction.
660 unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
662 // Set the conditional execution predicate
663 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
665 // Encode S bit if MI modifies CPSR.
666 Binary |= getAddrModeSBit(MI, TID);
669 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
671 // Encode Rn which is PC.
672 Binary |= getARMRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
674 // Encode the displacement.
675 Binary |= 1 << ARMII::I_BitShift;
676 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
681 void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
682 unsigned Opcode = MI.getDesc().Opcode;
684 // Part of binary is determined by TableGn.
685 unsigned Binary = getBinaryCodeForInstr(MI);
687 // Set the conditional execution predicate
688 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
690 // Encode S bit if MI modifies CPSR.
691 if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
692 Binary |= 1 << ARMII::S_BitShift;
694 // Encode register def if there is one.
695 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
697 // Encode the shift operation.
704 case ARM::MOVsrl_flag:
706 Binary |= (0x2 << 4) | (1 << 7);
708 case ARM::MOVsra_flag:
710 Binary |= (0x4 << 4) | (1 << 7);
714 // Encode register Rm.
715 Binary |= getMachineOpValue(MI, 1);
720 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
721 DEBUG(errs() << " ** LPC" << LabelID << " @ "
722 << (void*)MCE.getCurrentPCValue() << '\n');
723 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
726 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
727 unsigned Opcode = MI.getDesc().Opcode;
730 llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
734 case ARM::BMOVPCRXr9: {
735 // First emit mov lr, pc
736 unsigned Binary = 0x01a0e00f;
737 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
740 // and then emit the branch.
741 emitMiscBranchInstruction(MI);
744 case TargetOpcode::INLINEASM: {
745 // We allow inline assembler nodes with empty bodies - they can
746 // implicitly define registers, which is ok for JIT.
747 if (MI.getOperand(0).getSymbolName()[0]) {
748 report_fatal_error("JIT does not support inline asm!");
752 case TargetOpcode::PROLOG_LABEL:
753 case TargetOpcode::EH_LABEL:
754 MCE.emitLabel(MI.getOperand(0).getMCSymbol());
756 case TargetOpcode::IMPLICIT_DEF:
757 case TargetOpcode::KILL:
760 case ARM::CONSTPOOL_ENTRY:
761 emitConstPoolInstruction(MI);
764 // Remember of the address of the PC label for relocation later.
765 addPCLabel(MI.getOperand(2).getImm());
766 // PICADD is just an add instruction that implicitly read pc.
767 emitDataProcessingInstruction(MI, 0, ARM::PC);
774 // Remember of the address of the PC label for relocation later.
775 addPCLabel(MI.getOperand(2).getImm());
776 // These are just load / store instructions that implicitly read pc.
777 emitLoadStoreInstruction(MI, 0, ARM::PC);
784 // Remember of the address of the PC label for relocation later.
785 addPCLabel(MI.getOperand(2).getImm());
786 // These are just load / store instructions that implicitly read pc.
787 emitMiscLoadStoreInstruction(MI, ARM::PC);
792 emitMOVi32immInstruction(MI);
795 case ARM::MOVi2pieces:
796 // Two instructions to materialize a constant.
797 emitMOVi2piecesInstruction(MI);
799 case ARM::LEApcrelJT:
800 // Materialize jumptable address.
801 emitLEApcrelJTInstruction(MI);
804 case ARM::MOVsrl_flag:
805 case ARM::MOVsra_flag:
806 emitPseudoMoveInstruction(MI);
811 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
812 const TargetInstrDesc &TID,
813 const MachineOperand &MO,
815 unsigned Binary = getMachineOpValue(MI, MO);
817 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
818 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
819 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
821 // Encode the shift opcode.
823 unsigned Rs = MO1.getReg();
825 // Set shift operand (bit[7:4]).
830 // RRX - 0110 and bit[11:8] clear.
832 default: llvm_unreachable("Unknown shift opc!");
833 case ARM_AM::lsl: SBits = 0x1; break;
834 case ARM_AM::lsr: SBits = 0x3; break;
835 case ARM_AM::asr: SBits = 0x5; break;
836 case ARM_AM::ror: SBits = 0x7; break;
837 case ARM_AM::rrx: SBits = 0x6; break;
840 // Set shift operand (bit[6:4]).
846 default: llvm_unreachable("Unknown shift opc!");
847 case ARM_AM::lsl: SBits = 0x0; break;
848 case ARM_AM::lsr: SBits = 0x2; break;
849 case ARM_AM::asr: SBits = 0x4; break;
850 case ARM_AM::ror: SBits = 0x6; break;
853 Binary |= SBits << 4;
854 if (SOpc == ARM_AM::rrx)
857 // Encode the shift operation Rs or shift_imm (except rrx).
859 // Encode Rs bit[11:8].
860 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
861 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
864 // Encode shift_imm bit[11:7].
865 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
868 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
869 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
870 assert(SoImmVal != -1 && "Not a valid so_imm value!");
872 // Encode rotate_imm.
873 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
874 << ARMII::SoRotImmShift;
877 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
881 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
882 const TargetInstrDesc &TID) const {
883 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
884 const MachineOperand &MO = MI.getOperand(i-1);
885 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
886 return 1 << ARMII::S_BitShift;
891 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
893 unsigned ImplicitRn) {
894 const TargetInstrDesc &TID = MI.getDesc();
896 // Part of binary is determined by TableGn.
897 unsigned Binary = getBinaryCodeForInstr(MI);
899 // Set the conditional execution predicate
900 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
902 // Encode S bit if MI modifies CPSR.
903 Binary |= getAddrModeSBit(MI, TID);
905 // Encode register def if there is one.
906 unsigned NumDefs = TID.getNumDefs();
909 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
911 // Special handling for implicit use (e.g. PC).
912 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
914 if (TID.Opcode == ARM::MOVi16) {
915 // Get immediate from MI.
916 unsigned Lo16 = getMovi32Value(MI, MI.getOperand(OpIdx),
917 ARM::reloc_arm_movw);
918 // Encode imm which is the same as in emitMOVi32immInstruction().
919 Binary |= Lo16 & 0xFFF;
920 Binary |= ((Lo16 >> 12) & 0xF) << 16;
923 } else if(TID.Opcode == ARM::MOVTi16) {
924 unsigned Hi16 = (getMovi32Value(MI, MI.getOperand(OpIdx),
925 ARM::reloc_arm_movt) >> 16);
926 Binary |= Hi16 & 0xFFF;
927 Binary |= ((Hi16 >> 12) & 0xF) << 16;
930 } else if ((TID.Opcode == ARM::BFC) || (TID.Opcode == ARM::BFI)) {
931 uint32_t v = ~MI.getOperand(2).getImm();
932 int32_t lsb = CountTrailingZeros_32(v);
933 int32_t msb = (32 - CountLeadingZeros_32(v)) - 1;
934 // Instr{20-16} = msb, Instr{11-7} = lsb
935 Binary |= (msb & 0x1F) << 16;
936 Binary |= (lsb & 0x1F) << 7;
939 } else if ((TID.Opcode == ARM::UBFX) || (TID.Opcode == ARM::SBFX)) {
940 // Encode Rn in Instr{0-3}
941 Binary |= getMachineOpValue(MI, OpIdx++);
943 uint32_t lsb = MI.getOperand(OpIdx++).getImm();
944 uint32_t widthm1 = MI.getOperand(OpIdx++).getImm() - 1;
946 // Instr{20-16} = widthm1, Instr{11-7} = lsb
947 Binary |= (widthm1 & 0x1F) << 16;
948 Binary |= (lsb & 0x1F) << 7;
953 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
954 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
957 // Encode first non-shifter register operand if there is one.
958 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
961 // Special handling for implicit use (e.g. PC).
962 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
964 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
969 // Encode shifter operand.
970 const MachineOperand &MO = MI.getOperand(OpIdx);
971 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
973 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
978 // Encode register Rm.
979 emitWordLE(Binary | getARMRegisterNumbering(MO.getReg()));
984 Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
989 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
991 unsigned ImplicitRn) {
992 const TargetInstrDesc &TID = MI.getDesc();
993 unsigned Form = TID.TSFlags & ARMII::FormMask;
994 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
996 // Part of binary is determined by TableGn.
997 unsigned Binary = getBinaryCodeForInstr(MI);
999 // If this is an LDRi12, STRi12 or LDRcp, nothing more needs be done.
1000 if (MI.getOpcode() == ARM::LDRi12 || MI.getOpcode() == ARM::LDRcp ||
1001 MI.getOpcode() == ARM::STRi12) {
1006 // Set the conditional execution predicate
1007 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1011 // Operand 0 of a pre- and post-indexed store is the address base
1012 // writeback. Skip it.
1013 bool Skipped = false;
1014 if (IsPrePost && Form == ARMII::StFrm) {
1019 // Set first operand
1021 // Special handling for implicit use (e.g. PC).
1022 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
1024 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1026 // Set second operand
1028 // Special handling for implicit use (e.g. PC).
1029 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1031 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1033 // If this is a two-address operand, skip it. e.g. LDR_PRE.
1034 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1037 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1038 unsigned AM2Opc = (ImplicitRn == ARM::PC)
1039 ? 0 : MI.getOperand(OpIdx+1).getImm();
1041 // Set bit U(23) according to sign of immed value (positive or negative).
1042 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
1044 if (!MO2.getReg()) { // is immediate
1045 if (ARM_AM::getAM2Offset(AM2Opc))
1046 // Set the value of offset_12 field
1047 Binary |= ARM_AM::getAM2Offset(AM2Opc);
1052 // Set bit I(25), because this is not in immediate encoding.
1053 Binary |= 1 << ARMII::I_BitShift;
1054 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
1055 // Set bit[3:0] to the corresponding Rm register
1056 Binary |= getARMRegisterNumbering(MO2.getReg());
1058 // If this instr is in scaled register offset/index instruction, set
1059 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
1060 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
1061 Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
1062 Binary |= ShImm << ARMII::ShiftShift; // shift_immed
1068 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
1069 unsigned ImplicitRn) {
1070 const TargetInstrDesc &TID = MI.getDesc();
1071 unsigned Form = TID.TSFlags & ARMII::FormMask;
1072 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1074 // Part of binary is determined by TableGn.
1075 unsigned Binary = getBinaryCodeForInstr(MI);
1077 // Set the conditional execution predicate
1078 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1082 // Operand 0 of a pre- and post-indexed store is the address base
1083 // writeback. Skip it.
1084 bool Skipped = false;
1085 if (IsPrePost && Form == ARMII::StMiscFrm) {
1090 // Set first operand
1091 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1093 // Skip LDRD and STRD's second operand.
1094 if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
1097 // Set second operand
1099 // Special handling for implicit use (e.g. PC).
1100 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1102 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1104 // If this is a two-address operand, skip it. e.g. LDRH_POST.
1105 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1108 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1109 unsigned AM3Opc = (ImplicitRn == ARM::PC)
1110 ? 0 : MI.getOperand(OpIdx+1).getImm();
1112 // Set bit U(23) according to sign of immed value (positive or negative)
1113 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
1116 // If this instr is in register offset/index encoding, set bit[3:0]
1117 // to the corresponding Rm register.
1119 Binary |= getARMRegisterNumbering(MO2.getReg());
1124 // This instr is in immediate offset/index encoding, set bit 22 to 1.
1125 Binary |= 1 << ARMII::AM3_I_BitShift;
1126 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
1128 Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
1129 Binary |= (ImmOffs & 0xF); // immedL
1135 static unsigned getAddrModeUPBits(unsigned Mode) {
1136 unsigned Binary = 0;
1138 // Set addressing mode by modifying bits U(23) and P(24)
1139 // IA - Increment after - bit U = 1 and bit P = 0
1140 // IB - Increment before - bit U = 1 and bit P = 1
1141 // DA - Decrement after - bit U = 0 and bit P = 0
1142 // DB - Decrement before - bit U = 0 and bit P = 1
1144 default: llvm_unreachable("Unknown addressing sub-mode!");
1145 case ARM_AM::da: break;
1146 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
1147 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
1148 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
1154 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
1155 const TargetInstrDesc &TID = MI.getDesc();
1156 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1158 // Part of binary is determined by TableGn.
1159 unsigned Binary = getBinaryCodeForInstr(MI);
1161 // Set the conditional execution predicate
1162 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1164 // Skip operand 0 of an instruction with base register update.
1169 // Set base address operand
1170 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1172 // Set addressing mode by modifying bits U(23) and P(24)
1173 const MachineOperand &MO = MI.getOperand(OpIdx++);
1174 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1178 Binary |= 0x1 << ARMII::W_BitShift;
1181 for (unsigned i = OpIdx+2, e = MI.getNumOperands(); i != e; ++i) {
1182 const MachineOperand &MO = MI.getOperand(i);
1183 if (!MO.isReg() || MO.isImplicit())
1185 unsigned RegNum = getARMRegisterNumbering(MO.getReg());
1186 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
1188 Binary |= 0x1 << RegNum;
1194 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
1195 const TargetInstrDesc &TID = MI.getDesc();
1197 // Part of binary is determined by TableGn.
1198 unsigned Binary = getBinaryCodeForInstr(MI);
1200 // Set the conditional execution predicate
1201 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1203 // Encode S bit if MI modifies CPSR.
1204 Binary |= getAddrModeSBit(MI, TID);
1206 // 32x32->64bit operations have two destination registers. The number
1207 // of register definitions will tell us if that's what we're dealing with.
1209 if (TID.getNumDefs() == 2)
1210 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
1213 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
1216 Binary |= getMachineOpValue(MI, OpIdx++);
1219 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
1221 // Many multiple instructions (e.g. MLA) have three src operands. Encode
1222 // it as Rn (for multiply, that's in the same offset as RdLo.
1223 if (TID.getNumOperands() > OpIdx &&
1224 !TID.OpInfo[OpIdx].isPredicate() &&
1225 !TID.OpInfo[OpIdx].isOptionalDef())
1226 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
1231 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
1232 const TargetInstrDesc &TID = MI.getDesc();
1234 // Part of binary is determined by TableGn.
1235 unsigned Binary = getBinaryCodeForInstr(MI);
1237 // Set the conditional execution predicate
1238 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1243 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1245 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1246 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1248 // Two register operand form.
1250 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1253 Binary |= getMachineOpValue(MI, MO2);
1256 Binary |= getMachineOpValue(MI, MO1);
1259 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1260 if (MI.getOperand(OpIdx).isImm() &&
1261 !TID.OpInfo[OpIdx].isPredicate() &&
1262 !TID.OpInfo[OpIdx].isOptionalDef())
1263 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1268 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1269 const TargetInstrDesc &TID = MI.getDesc();
1271 // Part of binary is determined by TableGn.
1272 unsigned Binary = getBinaryCodeForInstr(MI);
1274 // Set the conditional execution predicate
1275 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1280 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1282 const MachineOperand &MO = MI.getOperand(OpIdx++);
1283 if (OpIdx == TID.getNumOperands() ||
1284 TID.OpInfo[OpIdx].isPredicate() ||
1285 TID.OpInfo[OpIdx].isOptionalDef()) {
1286 // Encode Rm and it's done.
1287 Binary |= getMachineOpValue(MI, MO);
1293 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1296 Binary |= getMachineOpValue(MI, OpIdx++);
1298 // Encode shift_imm.
1299 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1300 if (TID.Opcode == ARM::PKHTB) {
1301 assert(ShiftAmt != 0 && "PKHTB shift_imm is 0!");
1305 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1306 Binary |= ShiftAmt << ARMII::ShiftShift;
1311 void ARMCodeEmitter::emitSaturateInstruction(const MachineInstr &MI) {
1312 const TargetInstrDesc &TID = MI.getDesc();
1314 // Part of binary is determined by TableGen.
1315 unsigned Binary = getBinaryCodeForInstr(MI);
1317 // Set the conditional execution predicate
1318 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1321 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
1323 // Encode saturate bit position.
1324 unsigned Pos = MI.getOperand(1).getImm();
1325 if (TID.Opcode == ARM::SSAT || TID.Opcode == ARM::SSAT16)
1327 assert((Pos < 16 || (Pos < 32 &&
1328 TID.Opcode != ARM::SSAT16 &&
1329 TID.Opcode != ARM::USAT16)) &&
1330 "saturate bit position out of range");
1331 Binary |= Pos << 16;
1334 Binary |= getMachineOpValue(MI, 2);
1336 // Encode shift_imm.
1337 if (TID.getNumOperands() == 4) {
1338 unsigned ShiftOp = MI.getOperand(3).getImm();
1339 ARM_AM::ShiftOpc Opc = ARM_AM::getSORegShOp(ShiftOp);
1340 if (Opc == ARM_AM::asr)
1342 unsigned ShiftAmt = MI.getOperand(3).getImm();
1343 if (ShiftAmt == 32 && Opc == ARM_AM::asr)
1345 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1346 Binary |= ShiftAmt << ARMII::ShiftShift;
1352 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1353 const TargetInstrDesc &TID = MI.getDesc();
1355 if (TID.Opcode == ARM::TPsoft) {
1356 llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1359 // Part of binary is determined by TableGn.
1360 unsigned Binary = getBinaryCodeForInstr(MI);
1362 // Set the conditional execution predicate
1363 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1365 // Set signed_immed_24 field
1366 Binary |= getMachineOpValue(MI, 0);
1371 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1372 // Remember the base address of the inline jump table.
1373 uintptr_t JTBase = MCE.getCurrentPCValue();
1374 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1375 DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1378 // Now emit the jump table entries.
1379 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1380 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1382 // DestBB address - JT base.
1383 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1385 // Absolute DestBB address.
1386 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1391 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1392 const TargetInstrDesc &TID = MI.getDesc();
1394 // Handle jump tables.
1395 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1396 // First emit a ldr pc, [] instruction.
1397 emitDataProcessingInstruction(MI, ARM::PC);
1399 // Then emit the inline jump table.
1401 (TID.Opcode == ARM::BR_JTr)
1402 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1403 emitInlineJumpTable(JTIndex);
1405 } else if (TID.Opcode == ARM::BR_JTm) {
1406 // First emit a ldr pc, [] instruction.
1407 emitLoadStoreInstruction(MI, ARM::PC);
1409 // Then emit the inline jump table.
1410 emitInlineJumpTable(MI.getOperand(3).getIndex());
1414 // Part of binary is determined by TableGn.
1415 unsigned Binary = getBinaryCodeForInstr(MI);
1417 // Set the conditional execution predicate
1418 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1420 if (TID.Opcode == ARM::BX_RET || TID.Opcode == ARM::MOVPCLR)
1421 // The return register is LR.
1422 Binary |= getARMRegisterNumbering(ARM::LR);
1424 // otherwise, set the return register
1425 Binary |= getMachineOpValue(MI, 0);
1430 static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1431 unsigned RegD = MI.getOperand(OpIdx).getReg();
1432 unsigned Binary = 0;
1433 bool isSPVFP = ARM::SPRRegisterClass->contains(RegD);
1434 RegD = getARMRegisterNumbering(RegD);
1436 Binary |= RegD << ARMII::RegRdShift;
1438 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1439 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1444 static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1445 unsigned RegN = MI.getOperand(OpIdx).getReg();
1446 unsigned Binary = 0;
1447 bool isSPVFP = ARM::SPRRegisterClass->contains(RegN);
1448 RegN = getARMRegisterNumbering(RegN);
1450 Binary |= RegN << ARMII::RegRnShift;
1452 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1453 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1458 static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1459 unsigned RegM = MI.getOperand(OpIdx).getReg();
1460 unsigned Binary = 0;
1461 bool isSPVFP = ARM::SPRRegisterClass->contains(RegM);
1462 RegM = getARMRegisterNumbering(RegM);
1466 Binary |= ((RegM & 0x1E) >> 1);
1467 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1472 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1473 const TargetInstrDesc &TID = MI.getDesc();
1475 // Part of binary is determined by TableGn.
1476 unsigned Binary = getBinaryCodeForInstr(MI);
1478 // Set the conditional execution predicate
1479 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1482 assert((Binary & ARMII::D_BitShift) == 0 &&
1483 (Binary & ARMII::N_BitShift) == 0 &&
1484 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1487 Binary |= encodeVFPRd(MI, OpIdx++);
1489 // If this is a two-address operand, skip it, e.g. FMACD.
1490 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1494 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1495 Binary |= encodeVFPRn(MI, OpIdx++);
1497 if (OpIdx == TID.getNumOperands() ||
1498 TID.OpInfo[OpIdx].isPredicate() ||
1499 TID.OpInfo[OpIdx].isOptionalDef()) {
1500 // FCMPEZD etc. has only one operand.
1506 Binary |= encodeVFPRm(MI, OpIdx);
1511 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1512 const TargetInstrDesc &TID = MI.getDesc();
1513 unsigned Form = TID.TSFlags & ARMII::FormMask;
1515 // Part of binary is determined by TableGn.
1516 unsigned Binary = getBinaryCodeForInstr(MI);
1518 // Set the conditional execution predicate
1519 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1523 case ARMII::VFPConv1Frm:
1524 case ARMII::VFPConv2Frm:
1525 case ARMII::VFPConv3Frm:
1527 Binary |= encodeVFPRd(MI, 0);
1529 case ARMII::VFPConv4Frm:
1531 Binary |= encodeVFPRn(MI, 0);
1533 case ARMII::VFPConv5Frm:
1535 Binary |= encodeVFPRm(MI, 0);
1541 case ARMII::VFPConv1Frm:
1543 Binary |= encodeVFPRm(MI, 1);
1545 case ARMII::VFPConv2Frm:
1546 case ARMII::VFPConv3Frm:
1548 Binary |= encodeVFPRn(MI, 1);
1550 case ARMII::VFPConv4Frm:
1551 case ARMII::VFPConv5Frm:
1553 Binary |= encodeVFPRd(MI, 1);
1557 if (Form == ARMII::VFPConv5Frm)
1559 Binary |= encodeVFPRn(MI, 2);
1560 else if (Form == ARMII::VFPConv3Frm)
1562 Binary |= encodeVFPRm(MI, 2);
1567 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1568 // Part of binary is determined by TableGn.
1569 unsigned Binary = getBinaryCodeForInstr(MI);
1571 // Set the conditional execution predicate
1572 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1577 Binary |= encodeVFPRd(MI, OpIdx++);
1579 // Encode address base.
1580 const MachineOperand &Base = MI.getOperand(OpIdx++);
1581 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1583 // If there is a non-zero immediate offset, encode it.
1585 const MachineOperand &Offset = MI.getOperand(OpIdx);
1586 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1587 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1588 Binary |= 1 << ARMII::U_BitShift;
1595 // If immediate offset is omitted, default to +0.
1596 Binary |= 1 << ARMII::U_BitShift;
1602 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1603 const TargetInstrDesc &TID = MI.getDesc();
1604 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1606 // Part of binary is determined by TableGn.
1607 unsigned Binary = getBinaryCodeForInstr(MI);
1609 // Set the conditional execution predicate
1610 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1612 // Skip operand 0 of an instruction with base register update.
1617 // Set base address operand
1618 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1620 // Set addressing mode by modifying bits U(23) and P(24)
1621 const MachineOperand &MO = MI.getOperand(OpIdx++);
1622 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1626 Binary |= 0x1 << ARMII::W_BitShift;
1628 // First register is encoded in Dd.
1629 Binary |= encodeVFPRd(MI, OpIdx+2);
1631 // Count the number of registers.
1632 unsigned NumRegs = 1;
1633 for (unsigned i = OpIdx+3, e = MI.getNumOperands(); i != e; ++i) {
1634 const MachineOperand &MO = MI.getOperand(i);
1635 if (!MO.isReg() || MO.isImplicit())
1639 // Bit 8 will be set if <list> is consecutive 64-bit registers (e.g., D0)
1640 // Otherwise, it will be 0, in the case of 32-bit registers.
1642 Binary |= NumRegs * 2;
1649 static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
1650 unsigned RegD = MI.getOperand(OpIdx).getReg();
1651 unsigned Binary = 0;
1652 RegD = getARMRegisterNumbering(RegD);
1653 Binary |= (RegD & 0xf) << ARMII::RegRdShift;
1654 Binary |= ((RegD >> 4) & 1) << ARMII::D_BitShift;
1658 static unsigned encodeNEONRn(const MachineInstr &MI, unsigned OpIdx) {
1659 unsigned RegN = MI.getOperand(OpIdx).getReg();
1660 unsigned Binary = 0;
1661 RegN = getARMRegisterNumbering(RegN);
1662 Binary |= (RegN & 0xf) << ARMII::RegRnShift;
1663 Binary |= ((RegN >> 4) & 1) << ARMII::N_BitShift;
1667 static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
1668 unsigned RegM = MI.getOperand(OpIdx).getReg();
1669 unsigned Binary = 0;
1670 RegM = getARMRegisterNumbering(RegM);
1671 Binary |= (RegM & 0xf);
1672 Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
1676 /// convertNEONDataProcToThumb - Convert the ARM mode encoding for a NEON
1677 /// data-processing instruction to the corresponding Thumb encoding.
1678 static unsigned convertNEONDataProcToThumb(unsigned Binary) {
1679 assert((Binary & 0xfe000000) == 0xf2000000 &&
1680 "not an ARM NEON data-processing instruction");
1681 unsigned UBit = (Binary >> 24) & 1;
1682 return 0xef000000 | (UBit << 28) | (Binary & 0xffffff);
1685 void ARMCodeEmitter::emitNEONLaneInstruction(const MachineInstr &MI) {
1686 unsigned Binary = getBinaryCodeForInstr(MI);
1688 unsigned RegTOpIdx, RegNOpIdx, LnOpIdx;
1689 const TargetInstrDesc &TID = MI.getDesc();
1690 if ((TID.TSFlags & ARMII::FormMask) == ARMII::NGetLnFrm) {
1694 } else { // ARMII::NSetLnFrm
1700 // Set the conditional execution predicate
1701 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1703 unsigned RegT = MI.getOperand(RegTOpIdx).getReg();
1704 RegT = getARMRegisterNumbering(RegT);
1705 Binary |= (RegT << ARMII::RegRdShift);
1706 Binary |= encodeNEONRn(MI, RegNOpIdx);
1709 if ((Binary & (1 << 22)) != 0)
1710 LaneShift = 0; // 8-bit elements
1711 else if ((Binary & (1 << 5)) != 0)
1712 LaneShift = 1; // 16-bit elements
1714 LaneShift = 2; // 32-bit elements
1716 unsigned Lane = MI.getOperand(LnOpIdx).getImm() << LaneShift;
1717 unsigned Opc1 = Lane >> 2;
1718 unsigned Opc2 = Lane & 3;
1719 assert((Opc1 & 3) == 0 && "out-of-range lane number operand");
1720 Binary |= (Opc1 << 21);
1721 Binary |= (Opc2 << 5);
1726 void ARMCodeEmitter::emitNEONDupInstruction(const MachineInstr &MI) {
1727 unsigned Binary = getBinaryCodeForInstr(MI);
1729 // Set the conditional execution predicate
1730 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1732 unsigned RegT = MI.getOperand(1).getReg();
1733 RegT = getARMRegisterNumbering(RegT);
1734 Binary |= (RegT << ARMII::RegRdShift);
1735 Binary |= encodeNEONRn(MI, 0);
1739 void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
1740 unsigned Binary = getBinaryCodeForInstr(MI);
1741 // Destination register is encoded in Dd.
1742 Binary |= encodeNEONRd(MI, 0);
1743 // Immediate fields: Op, Cmode, I, Imm3, Imm4
1744 unsigned Imm = MI.getOperand(1).getImm();
1745 unsigned Op = (Imm >> 12) & 1;
1746 unsigned Cmode = (Imm >> 8) & 0xf;
1747 unsigned I = (Imm >> 7) & 1;
1748 unsigned Imm3 = (Imm >> 4) & 0x7;
1749 unsigned Imm4 = Imm & 0xf;
1750 Binary |= (I << 24) | (Imm3 << 16) | (Cmode << 8) | (Op << 5) | Imm4;
1752 Binary = convertNEONDataProcToThumb(Binary);
1756 void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
1757 const TargetInstrDesc &TID = MI.getDesc();
1758 unsigned Binary = getBinaryCodeForInstr(MI);
1759 // Destination register is encoded in Dd; source register in Dm.
1761 Binary |= encodeNEONRd(MI, OpIdx++);
1762 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1764 Binary |= encodeNEONRm(MI, OpIdx);
1766 Binary = convertNEONDataProcToThumb(Binary);
1767 // FIXME: This does not handle VDUPfdf or VDUPfqf.
1771 void ARMCodeEmitter::emitNEON3RegInstruction(const MachineInstr &MI) {
1772 const TargetInstrDesc &TID = MI.getDesc();
1773 unsigned Binary = getBinaryCodeForInstr(MI);
1774 // Destination register is encoded in Dd; source registers in Dn and Dm.
1776 Binary |= encodeNEONRd(MI, OpIdx++);
1777 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1779 Binary |= encodeNEONRn(MI, OpIdx++);
1780 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1782 Binary |= encodeNEONRm(MI, OpIdx);
1784 Binary = convertNEONDataProcToThumb(Binary);
1785 // FIXME: This does not handle VMOVDneon or VMOVQ.
1789 #include "ARMGenCodeEmitter.inc"