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 emitNEONLaneInstruction(const MachineInstr &MI);
144 void emitNEONDupInstruction(const MachineInstr &MI);
145 void emitNEON1RegModImmInstruction(const MachineInstr &MI);
146 void emitNEON2RegInstruction(const MachineInstr &MI);
147 void emitNEON3RegInstruction(const MachineInstr &MI);
149 /// getMachineOpValue - Return binary encoding of operand. If the machine
150 /// operand requires relocation, record the relocation and return zero.
151 unsigned getMachineOpValue(const MachineInstr &MI,
152 const MachineOperand &MO) const;
153 unsigned getMachineOpValue(const MachineInstr &MI, unsigned OpIdx) const {
154 return getMachineOpValue(MI, MI.getOperand(OpIdx));
157 // FIXME: The legacy JIT ARMCodeEmitter doesn't rely on the the
158 // TableGen'erated getBinaryCodeForInstr() function to encode any
159 // operand values, instead querying getMachineOpValue() directly for
160 // each operand it needs to encode. Thus, any of the new encoder
161 // helper functions can simply return 0 as the values the return
162 // are already handled elsewhere. They are placeholders to allow this
163 // encoder to continue to function until the MC encoder is sufficiently
164 // far along that this one can be eliminated entirely.
165 unsigned getCCOutOpValue(const MachineInstr &MI, unsigned Op)
167 unsigned getSOImmOpValue(const MachineInstr &MI, unsigned Op)
169 unsigned getSORegOpValue(const MachineInstr &MI, unsigned Op)
171 unsigned getRotImmOpValue(const MachineInstr &MI, unsigned Op)
173 unsigned getImmMinusOneOpValue(const MachineInstr &MI, unsigned Op)
175 unsigned getBitfieldInvertedMaskOpValue(const MachineInstr &MI,
176 unsigned Op) const { return 0; }
177 unsigned getAddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
180 // {12} = (U)nsigned (add == '1', sub == '0')
182 const MachineOperand &MO = MI.getOperand(Op);
183 const MachineOperand &MO1 = MI.getOperand(Op + 1);
185 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
188 unsigned Reg = getARMRegisterNumbering(MO.getReg());
189 int32_t Imm12 = MO1.getImm();
191 Binary = Imm12 & 0xfff;
194 Binary |= (Reg << 13);
198 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
199 /// machine operand requires relocation, record the relocation and return
201 unsigned getMovi32Value(const MachineInstr &MI,const MachineOperand &MO,
204 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
206 unsigned getShiftOp(unsigned Imm) const ;
208 /// Routines that handle operands which add machine relocations which are
209 /// fixed up by the relocation stage.
210 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
211 bool MayNeedFarStub, bool Indirect,
212 intptr_t ACPV = 0) const;
213 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
214 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
215 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
216 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
217 intptr_t JTBase = 0) const;
221 char ARMCodeEmitter::ID = 0;
223 /// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
224 /// code to the specified MCE object.
225 FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
226 JITCodeEmitter &JCE) {
227 return new ARMCodeEmitter(TM, JCE);
230 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
231 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
232 MF.getTarget().getRelocationModel() != Reloc::Static) &&
233 "JIT relocation model must be set to static or default!");
234 JTI = ((ARMTargetMachine &)MF.getTarget()).getJITInfo();
235 II = ((const ARMTargetMachine &)MF.getTarget()).getInstrInfo();
236 TD = ((const ARMTargetMachine &)MF.getTarget()).getTargetData();
237 Subtarget = &TM.getSubtarget<ARMSubtarget>();
238 MCPEs = &MF.getConstantPool()->getConstants();
240 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
241 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
242 IsThumb = MF.getInfo<ARMFunctionInfo>()->isThumbFunction();
243 JTI->Initialize(MF, IsPIC);
244 MMI = &getAnalysis<MachineModuleInfo>();
245 MCE.setModuleInfo(MMI);
248 DEBUG(errs() << "JITTing function '"
249 << MF.getFunction()->getName() << "'\n");
250 MCE.startFunction(MF);
251 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
253 MCE.StartMachineBasicBlock(MBB);
254 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
258 } while (MCE.finishFunction(MF));
263 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
265 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
266 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
267 default: llvm_unreachable("Unknown shift opc!");
268 case ARM_AM::asr: return 2;
269 case ARM_AM::lsl: return 0;
270 case ARM_AM::lsr: return 1;
272 case ARM_AM::rrx: return 3;
277 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
278 /// machine operand requires relocation, record the relocation and return zero.
279 unsigned ARMCodeEmitter::getMovi32Value(const MachineInstr &MI,
280 const MachineOperand &MO,
282 assert(((Reloc == ARM::reloc_arm_movt) || (Reloc == ARM::reloc_arm_movw))
283 && "Relocation to this function should be for movt or movw");
286 return static_cast<unsigned>(MO.getImm());
287 else if (MO.isGlobal())
288 emitGlobalAddress(MO.getGlobal(), Reloc, true, false);
289 else if (MO.isSymbol())
290 emitExternalSymbolAddress(MO.getSymbolName(), Reloc);
292 emitMachineBasicBlock(MO.getMBB(), Reloc);
297 llvm_unreachable("Unsupported operand type for movw/movt");
302 /// getMachineOpValue - Return binary encoding of operand. If the machine
303 /// operand requires relocation, record the relocation and return zero.
304 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
305 const MachineOperand &MO) const {
307 return getARMRegisterNumbering(MO.getReg());
309 return static_cast<unsigned>(MO.getImm());
310 else if (MO.isGlobal())
311 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
312 else if (MO.isSymbol())
313 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
314 else if (MO.isCPI()) {
315 const TargetInstrDesc &TID = MI.getDesc();
316 // For VFP load, the immediate offset is multiplied by 4.
317 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
318 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
319 emitConstPoolAddress(MO.getIndex(), Reloc);
320 } else if (MO.isJTI())
321 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
323 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
333 /// emitGlobalAddress - Emit the specified address to the code stream.
335 void ARMCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
336 bool MayNeedFarStub, bool Indirect,
337 intptr_t ACPV) const {
338 MachineRelocation MR = Indirect
339 ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
340 const_cast<GlobalValue *>(GV),
341 ACPV, MayNeedFarStub)
342 : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
343 const_cast<GlobalValue *>(GV), ACPV,
345 MCE.addRelocation(MR);
348 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
349 /// be emitted to the current location in the function, and allow it to be PC
351 void ARMCodeEmitter::
352 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
353 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
357 /// emitConstPoolAddress - Arrange for the address of an constant pool
358 /// to be emitted to the current location in the function, and allow it to be PC
360 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
361 // Tell JIT emitter we'll resolve the address.
362 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
363 Reloc, CPI, 0, true));
366 /// emitJumpTableAddress - Arrange for the address of a jump table to
367 /// be emitted to the current location in the function, and allow it to be PC
369 void ARMCodeEmitter::
370 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
371 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
372 Reloc, JTIndex, 0, true));
375 /// emitMachineBasicBlock - Emit the specified address basic block.
376 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
378 intptr_t JTBase) const {
379 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
383 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
384 DEBUG(errs() << " 0x";
385 errs().write_hex(Binary) << "\n");
386 MCE.emitWordLE(Binary);
389 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
390 DEBUG(errs() << " 0x";
391 errs().write_hex(Binary) << "\n");
392 MCE.emitDWordLE(Binary);
395 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
396 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
398 MCE.processDebugLoc(MI.getDebugLoc(), true);
400 ++NumEmitted; // Keep track of the # of mi's emitted
401 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
403 llvm_unreachable("Unhandled instruction encoding format!");
407 emitPseudoInstruction(MI);
410 case ARMII::DPSoRegFrm:
411 emitDataProcessingInstruction(MI);
415 emitLoadStoreInstruction(MI);
417 case ARMII::LdMiscFrm:
418 case ARMII::StMiscFrm:
419 emitMiscLoadStoreInstruction(MI);
421 case ARMII::LdStMulFrm:
422 emitLoadStoreMultipleInstruction(MI);
425 emitMulFrmInstruction(MI);
428 emitExtendInstruction(MI);
430 case ARMII::ArithMiscFrm:
431 emitMiscArithInstruction(MI);
434 emitSaturateInstruction(MI);
437 emitBranchInstruction(MI);
439 case ARMII::BrMiscFrm:
440 emitMiscBranchInstruction(MI);
443 case ARMII::VFPUnaryFrm:
444 case ARMII::VFPBinaryFrm:
445 emitVFPArithInstruction(MI);
447 case ARMII::VFPConv1Frm:
448 case ARMII::VFPConv2Frm:
449 case ARMII::VFPConv3Frm:
450 case ARMII::VFPConv4Frm:
451 case ARMII::VFPConv5Frm:
452 emitVFPConversionInstruction(MI);
454 case ARMII::VFPLdStFrm:
455 emitVFPLoadStoreInstruction(MI);
457 case ARMII::VFPLdStMulFrm:
458 emitVFPLoadStoreMultipleInstruction(MI);
461 // NEON instructions.
462 case ARMII::NGetLnFrm:
463 case ARMII::NSetLnFrm:
464 emitNEONLaneInstruction(MI);
467 emitNEONDupInstruction(MI);
469 case ARMII::N1RegModImmFrm:
470 emitNEON1RegModImmInstruction(MI);
472 case ARMII::N2RegFrm:
473 emitNEON2RegInstruction(MI);
475 case ARMII::N3RegFrm:
476 emitNEON3RegInstruction(MI);
479 MCE.processDebugLoc(MI.getDebugLoc(), false);
482 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
483 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
484 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
485 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
487 // Remember the CONSTPOOL_ENTRY address for later relocation.
488 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
490 // Emit constpool island entry. In most cases, the actual values will be
491 // resolved and relocated after code emission.
492 if (MCPE.isMachineConstantPoolEntry()) {
493 ARMConstantPoolValue *ACPV =
494 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
496 DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
497 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
499 assert(ACPV->isGlobalValue() && "unsupported constant pool value");
500 const GlobalValue *GV = ACPV->getGV();
502 Reloc::Model RelocM = TM.getRelocationModel();
503 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
505 Subtarget->GVIsIndirectSymbol(GV, RelocM),
508 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
512 const Constant *CV = MCPE.Val.ConstVal;
515 errs() << " ** Constant pool #" << CPI << " @ "
516 << (void*)MCE.getCurrentPCValue() << " ";
517 if (const Function *F = dyn_cast<Function>(CV))
518 errs() << F->getName();
524 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
525 emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
527 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
528 uint32_t Val = uint32_t(*CI->getValue().getRawData());
530 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
531 if (CFP->getType()->isFloatTy())
532 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
533 else if (CFP->getType()->isDoubleTy())
534 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
536 llvm_unreachable("Unable to handle this constantpool entry!");
539 llvm_unreachable("Unable to handle this constantpool entry!");
544 void ARMCodeEmitter::emitMOVi32immInstruction(const MachineInstr &MI) {
545 const MachineOperand &MO0 = MI.getOperand(0);
546 const MachineOperand &MO1 = MI.getOperand(1);
548 // Emit the 'movw' instruction.
549 unsigned Binary = 0x30 << 20; // mov: Insts{27-20} = 0b00110000
551 unsigned Lo16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movw) & 0xFFFF;
553 // Set the conditional execution predicate.
554 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
557 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
559 // Encode imm16 as imm4:imm12
560 Binary |= Lo16 & 0xFFF; // Insts{11-0} = imm12
561 Binary |= ((Lo16 >> 12) & 0xF) << 16; // Insts{19-16} = imm4
564 unsigned Hi16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movt) >> 16;
565 // Emit the 'movt' instruction.
566 Binary = 0x34 << 20; // movt: Insts{27-20} = 0b00110100
568 // Set the conditional execution predicate.
569 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
572 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
574 // Encode imm16 as imm4:imm1, same as movw above.
575 Binary |= Hi16 & 0xFFF;
576 Binary |= ((Hi16 >> 12) & 0xF) << 16;
580 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
581 const MachineOperand &MO0 = MI.getOperand(0);
582 const MachineOperand &MO1 = MI.getOperand(1);
583 assert(MO1.isImm() && ARM_AM::isSOImmTwoPartVal(MO1.getImm()) &&
584 "Not a valid so_imm value!");
585 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
586 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
588 // Emit the 'mov' instruction.
589 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
591 // Set the conditional execution predicate.
592 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
595 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
598 // Set bit I(25) to identify this is the immediate form of <shifter_op>
599 Binary |= 1 << ARMII::I_BitShift;
600 Binary |= getMachineSoImmOpValue(V1);
603 // Now the 'orr' instruction.
604 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
606 // Set the conditional execution predicate.
607 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
610 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
613 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
616 // Set bit I(25) to identify this is the immediate form of <shifter_op>
617 Binary |= 1 << ARMII::I_BitShift;
618 Binary |= getMachineSoImmOpValue(V2);
622 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
623 // It's basically add r, pc, (LJTI - $+8)
625 const TargetInstrDesc &TID = MI.getDesc();
627 // Emit the 'add' instruction.
628 unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
630 // Set the conditional execution predicate
631 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
633 // Encode S bit if MI modifies CPSR.
634 Binary |= getAddrModeSBit(MI, TID);
637 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
639 // Encode Rn which is PC.
640 Binary |= getARMRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
642 // Encode the displacement.
643 Binary |= 1 << ARMII::I_BitShift;
644 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
649 void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
650 unsigned Opcode = MI.getDesc().Opcode;
652 // Part of binary is determined by TableGn.
653 unsigned Binary = getBinaryCodeForInstr(MI);
655 // Set the conditional execution predicate
656 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
658 // Encode S bit if MI modifies CPSR.
659 if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
660 Binary |= 1 << ARMII::S_BitShift;
662 // Encode register def if there is one.
663 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
665 // Encode the shift operation.
672 case ARM::MOVsrl_flag:
674 Binary |= (0x2 << 4) | (1 << 7);
676 case ARM::MOVsra_flag:
678 Binary |= (0x4 << 4) | (1 << 7);
682 // Encode register Rm.
683 Binary |= getMachineOpValue(MI, 1);
688 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
689 DEBUG(errs() << " ** LPC" << LabelID << " @ "
690 << (void*)MCE.getCurrentPCValue() << '\n');
691 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
694 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
695 unsigned Opcode = MI.getDesc().Opcode;
698 llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
702 case ARM::BMOVPCRXr9: {
703 // First emit mov lr, pc
704 unsigned Binary = 0x01a0e00f;
705 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
708 // and then emit the branch.
709 emitMiscBranchInstruction(MI);
712 case TargetOpcode::INLINEASM: {
713 // We allow inline assembler nodes with empty bodies - they can
714 // implicitly define registers, which is ok for JIT.
715 if (MI.getOperand(0).getSymbolName()[0]) {
716 report_fatal_error("JIT does not support inline asm!");
720 case TargetOpcode::PROLOG_LABEL:
721 case TargetOpcode::EH_LABEL:
722 MCE.emitLabel(MI.getOperand(0).getMCSymbol());
724 case TargetOpcode::IMPLICIT_DEF:
725 case TargetOpcode::KILL:
728 case ARM::CONSTPOOL_ENTRY:
729 emitConstPoolInstruction(MI);
732 // Remember of the address of the PC label for relocation later.
733 addPCLabel(MI.getOperand(2).getImm());
734 // PICADD is just an add instruction that implicitly read pc.
735 emitDataProcessingInstruction(MI, 0, ARM::PC);
742 // Remember of the address of the PC label for relocation later.
743 addPCLabel(MI.getOperand(2).getImm());
744 // These are just load / store instructions that implicitly read pc.
745 emitLoadStoreInstruction(MI, 0, ARM::PC);
752 // Remember of the address of the PC label for relocation later.
753 addPCLabel(MI.getOperand(2).getImm());
754 // These are just load / store instructions that implicitly read pc.
755 emitMiscLoadStoreInstruction(MI, ARM::PC);
760 emitMOVi32immInstruction(MI);
763 case ARM::MOVi2pieces:
764 // Two instructions to materialize a constant.
765 emitMOVi2piecesInstruction(MI);
767 case ARM::LEApcrelJT:
768 // Materialize jumptable address.
769 emitLEApcrelJTInstruction(MI);
772 case ARM::MOVsrl_flag:
773 case ARM::MOVsra_flag:
774 emitPseudoMoveInstruction(MI);
779 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
780 const TargetInstrDesc &TID,
781 const MachineOperand &MO,
783 unsigned Binary = getMachineOpValue(MI, MO);
785 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
786 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
787 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
789 // Encode the shift opcode.
791 unsigned Rs = MO1.getReg();
793 // Set shift operand (bit[7:4]).
798 // RRX - 0110 and bit[11:8] clear.
800 default: llvm_unreachable("Unknown shift opc!");
801 case ARM_AM::lsl: SBits = 0x1; break;
802 case ARM_AM::lsr: SBits = 0x3; break;
803 case ARM_AM::asr: SBits = 0x5; break;
804 case ARM_AM::ror: SBits = 0x7; break;
805 case ARM_AM::rrx: SBits = 0x6; break;
808 // Set shift operand (bit[6:4]).
814 default: llvm_unreachable("Unknown shift opc!");
815 case ARM_AM::lsl: SBits = 0x0; break;
816 case ARM_AM::lsr: SBits = 0x2; break;
817 case ARM_AM::asr: SBits = 0x4; break;
818 case ARM_AM::ror: SBits = 0x6; break;
821 Binary |= SBits << 4;
822 if (SOpc == ARM_AM::rrx)
825 // Encode the shift operation Rs or shift_imm (except rrx).
827 // Encode Rs bit[11:8].
828 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
829 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
832 // Encode shift_imm bit[11:7].
833 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
836 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
837 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
838 assert(SoImmVal != -1 && "Not a valid so_imm value!");
840 // Encode rotate_imm.
841 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
842 << ARMII::SoRotImmShift;
845 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
849 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
850 const TargetInstrDesc &TID) const {
851 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
852 const MachineOperand &MO = MI.getOperand(i-1);
853 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
854 return 1 << ARMII::S_BitShift;
859 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
861 unsigned ImplicitRn) {
862 const TargetInstrDesc &TID = MI.getDesc();
864 // Part of binary is determined by TableGn.
865 unsigned Binary = getBinaryCodeForInstr(MI);
867 // Set the conditional execution predicate
868 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
870 // Encode S bit if MI modifies CPSR.
871 Binary |= getAddrModeSBit(MI, TID);
873 // Encode register def if there is one.
874 unsigned NumDefs = TID.getNumDefs();
877 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
879 // Special handling for implicit use (e.g. PC).
880 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
882 if (TID.Opcode == ARM::MOVi16) {
883 // Get immediate from MI.
884 unsigned Lo16 = getMovi32Value(MI, MI.getOperand(OpIdx),
885 ARM::reloc_arm_movw);
886 // Encode imm which is the same as in emitMOVi32immInstruction().
887 Binary |= Lo16 & 0xFFF;
888 Binary |= ((Lo16 >> 12) & 0xF) << 16;
891 } else if(TID.Opcode == ARM::MOVTi16) {
892 unsigned Hi16 = (getMovi32Value(MI, MI.getOperand(OpIdx),
893 ARM::reloc_arm_movt) >> 16);
894 Binary |= Hi16 & 0xFFF;
895 Binary |= ((Hi16 >> 12) & 0xF) << 16;
898 } else if ((TID.Opcode == ARM::BFC) || (TID.Opcode == ARM::BFI)) {
899 uint32_t v = ~MI.getOperand(2).getImm();
900 int32_t lsb = CountTrailingZeros_32(v);
901 int32_t msb = (32 - CountLeadingZeros_32(v)) - 1;
902 // Instr{20-16} = msb, Instr{11-7} = lsb
903 Binary |= (msb & 0x1F) << 16;
904 Binary |= (lsb & 0x1F) << 7;
907 } else if ((TID.Opcode == ARM::UBFX) || (TID.Opcode == ARM::SBFX)) {
908 // Encode Rn in Instr{0-3}
909 Binary |= getMachineOpValue(MI, OpIdx++);
911 uint32_t lsb = MI.getOperand(OpIdx++).getImm();
912 uint32_t widthm1 = MI.getOperand(OpIdx++).getImm() - 1;
914 // Instr{20-16} = widthm1, Instr{11-7} = lsb
915 Binary |= (widthm1 & 0x1F) << 16;
916 Binary |= (lsb & 0x1F) << 7;
921 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
922 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
925 // Encode first non-shifter register operand if there is one.
926 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
929 // Special handling for implicit use (e.g. PC).
930 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
932 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
937 // Encode shifter operand.
938 const MachineOperand &MO = MI.getOperand(OpIdx);
939 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
941 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
946 // Encode register Rm.
947 emitWordLE(Binary | getARMRegisterNumbering(MO.getReg()));
952 Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
957 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
959 unsigned ImplicitRn) {
960 const TargetInstrDesc &TID = MI.getDesc();
961 unsigned Form = TID.TSFlags & ARMII::FormMask;
962 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
964 // Part of binary is determined by TableGn.
965 unsigned Binary = getBinaryCodeForInstr(MI);
967 // If this is an LDRi12 or LDRcp, nothing more needs be done.
968 if (MI.getOpcode() == ARM::LDRi12 || MI.getOpcode() == ARM::LDRcp) {
973 // Set the conditional execution predicate
974 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
978 // Operand 0 of a pre- and post-indexed store is the address base
979 // writeback. Skip it.
980 bool Skipped = false;
981 if (IsPrePost && Form == ARMII::StFrm) {
988 // Special handling for implicit use (e.g. PC).
989 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
991 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
993 // Set second operand
995 // Special handling for implicit use (e.g. PC).
996 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
998 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1000 // If this is a two-address operand, skip it. e.g. LDR_PRE.
1001 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1004 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1005 unsigned AM2Opc = (ImplicitRn == ARM::PC)
1006 ? 0 : MI.getOperand(OpIdx+1).getImm();
1008 // Set bit U(23) according to sign of immed value (positive or negative).
1009 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
1011 if (!MO2.getReg()) { // is immediate
1012 if (ARM_AM::getAM2Offset(AM2Opc))
1013 // Set the value of offset_12 field
1014 Binary |= ARM_AM::getAM2Offset(AM2Opc);
1019 // Set bit I(25), because this is not in immediate encoding.
1020 Binary |= 1 << ARMII::I_BitShift;
1021 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
1022 // Set bit[3:0] to the corresponding Rm register
1023 Binary |= getARMRegisterNumbering(MO2.getReg());
1025 // If this instr is in scaled register offset/index instruction, set
1026 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
1027 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
1028 Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
1029 Binary |= ShImm << ARMII::ShiftShift; // shift_immed
1035 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
1036 unsigned ImplicitRn) {
1037 const TargetInstrDesc &TID = MI.getDesc();
1038 unsigned Form = TID.TSFlags & ARMII::FormMask;
1039 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1041 // Part of binary is determined by TableGn.
1042 unsigned Binary = getBinaryCodeForInstr(MI);
1044 // Set the conditional execution predicate
1045 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1049 // Operand 0 of a pre- and post-indexed store is the address base
1050 // writeback. Skip it.
1051 bool Skipped = false;
1052 if (IsPrePost && Form == ARMII::StMiscFrm) {
1057 // Set first operand
1058 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1060 // Skip LDRD and STRD's second operand.
1061 if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
1064 // Set second operand
1066 // Special handling for implicit use (e.g. PC).
1067 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1069 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1071 // If this is a two-address operand, skip it. e.g. LDRH_POST.
1072 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1075 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1076 unsigned AM3Opc = (ImplicitRn == ARM::PC)
1077 ? 0 : MI.getOperand(OpIdx+1).getImm();
1079 // Set bit U(23) according to sign of immed value (positive or negative)
1080 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
1083 // If this instr is in register offset/index encoding, set bit[3:0]
1084 // to the corresponding Rm register.
1086 Binary |= getARMRegisterNumbering(MO2.getReg());
1091 // This instr is in immediate offset/index encoding, set bit 22 to 1.
1092 Binary |= 1 << ARMII::AM3_I_BitShift;
1093 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
1095 Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
1096 Binary |= (ImmOffs & 0xF); // immedL
1102 static unsigned getAddrModeUPBits(unsigned Mode) {
1103 unsigned Binary = 0;
1105 // Set addressing mode by modifying bits U(23) and P(24)
1106 // IA - Increment after - bit U = 1 and bit P = 0
1107 // IB - Increment before - bit U = 1 and bit P = 1
1108 // DA - Decrement after - bit U = 0 and bit P = 0
1109 // DB - Decrement before - bit U = 0 and bit P = 1
1111 default: llvm_unreachable("Unknown addressing sub-mode!");
1112 case ARM_AM::da: break;
1113 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
1114 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
1115 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
1121 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
1122 const TargetInstrDesc &TID = MI.getDesc();
1123 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1125 // Part of binary is determined by TableGn.
1126 unsigned Binary = getBinaryCodeForInstr(MI);
1128 // Set the conditional execution predicate
1129 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1131 // Skip operand 0 of an instruction with base register update.
1136 // Set base address operand
1137 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1139 // Set addressing mode by modifying bits U(23) and P(24)
1140 const MachineOperand &MO = MI.getOperand(OpIdx++);
1141 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1145 Binary |= 0x1 << ARMII::W_BitShift;
1148 for (unsigned i = OpIdx+2, e = MI.getNumOperands(); i != e; ++i) {
1149 const MachineOperand &MO = MI.getOperand(i);
1150 if (!MO.isReg() || MO.isImplicit())
1152 unsigned RegNum = getARMRegisterNumbering(MO.getReg());
1153 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
1155 Binary |= 0x1 << RegNum;
1161 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
1162 const TargetInstrDesc &TID = MI.getDesc();
1164 // Part of binary is determined by TableGn.
1165 unsigned Binary = getBinaryCodeForInstr(MI);
1167 // Set the conditional execution predicate
1168 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1170 // Encode S bit if MI modifies CPSR.
1171 Binary |= getAddrModeSBit(MI, TID);
1173 // 32x32->64bit operations have two destination registers. The number
1174 // of register definitions will tell us if that's what we're dealing with.
1176 if (TID.getNumDefs() == 2)
1177 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
1180 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
1183 Binary |= getMachineOpValue(MI, OpIdx++);
1186 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
1188 // Many multiple instructions (e.g. MLA) have three src operands. Encode
1189 // it as Rn (for multiply, that's in the same offset as RdLo.
1190 if (TID.getNumOperands() > OpIdx &&
1191 !TID.OpInfo[OpIdx].isPredicate() &&
1192 !TID.OpInfo[OpIdx].isOptionalDef())
1193 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
1198 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
1199 const TargetInstrDesc &TID = MI.getDesc();
1201 // Part of binary is determined by TableGn.
1202 unsigned Binary = getBinaryCodeForInstr(MI);
1204 // Set the conditional execution predicate
1205 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1210 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1212 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1213 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1215 // Two register operand form.
1217 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1220 Binary |= getMachineOpValue(MI, MO2);
1223 Binary |= getMachineOpValue(MI, MO1);
1226 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1227 if (MI.getOperand(OpIdx).isImm() &&
1228 !TID.OpInfo[OpIdx].isPredicate() &&
1229 !TID.OpInfo[OpIdx].isOptionalDef())
1230 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1235 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1236 const TargetInstrDesc &TID = MI.getDesc();
1238 // Part of binary is determined by TableGn.
1239 unsigned Binary = getBinaryCodeForInstr(MI);
1241 // Set the conditional execution predicate
1242 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1247 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1249 const MachineOperand &MO = MI.getOperand(OpIdx++);
1250 if (OpIdx == TID.getNumOperands() ||
1251 TID.OpInfo[OpIdx].isPredicate() ||
1252 TID.OpInfo[OpIdx].isOptionalDef()) {
1253 // Encode Rm and it's done.
1254 Binary |= getMachineOpValue(MI, MO);
1260 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1263 Binary |= getMachineOpValue(MI, OpIdx++);
1265 // Encode shift_imm.
1266 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1267 if (TID.Opcode == ARM::PKHTB) {
1268 assert(ShiftAmt != 0 && "PKHTB shift_imm is 0!");
1272 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1273 Binary |= ShiftAmt << ARMII::ShiftShift;
1278 void ARMCodeEmitter::emitSaturateInstruction(const MachineInstr &MI) {
1279 const TargetInstrDesc &TID = MI.getDesc();
1281 // Part of binary is determined by TableGen.
1282 unsigned Binary = getBinaryCodeForInstr(MI);
1284 // Set the conditional execution predicate
1285 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1288 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
1290 // Encode saturate bit position.
1291 unsigned Pos = MI.getOperand(1).getImm();
1292 if (TID.Opcode == ARM::SSAT || TID.Opcode == ARM::SSAT16)
1294 assert((Pos < 16 || (Pos < 32 &&
1295 TID.Opcode != ARM::SSAT16 &&
1296 TID.Opcode != ARM::USAT16)) &&
1297 "saturate bit position out of range");
1298 Binary |= Pos << 16;
1301 Binary |= getMachineOpValue(MI, 2);
1303 // Encode shift_imm.
1304 if (TID.getNumOperands() == 4) {
1305 unsigned ShiftOp = MI.getOperand(3).getImm();
1306 ARM_AM::ShiftOpc Opc = ARM_AM::getSORegShOp(ShiftOp);
1307 if (Opc == ARM_AM::asr)
1309 unsigned ShiftAmt = MI.getOperand(3).getImm();
1310 if (ShiftAmt == 32 && Opc == ARM_AM::asr)
1312 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1313 Binary |= ShiftAmt << ARMII::ShiftShift;
1319 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1320 const TargetInstrDesc &TID = MI.getDesc();
1322 if (TID.Opcode == ARM::TPsoft) {
1323 llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1326 // Part of binary is determined by TableGn.
1327 unsigned Binary = getBinaryCodeForInstr(MI);
1329 // Set the conditional execution predicate
1330 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1332 // Set signed_immed_24 field
1333 Binary |= getMachineOpValue(MI, 0);
1338 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1339 // Remember the base address of the inline jump table.
1340 uintptr_t JTBase = MCE.getCurrentPCValue();
1341 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1342 DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1345 // Now emit the jump table entries.
1346 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1347 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1349 // DestBB address - JT base.
1350 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1352 // Absolute DestBB address.
1353 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1358 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1359 const TargetInstrDesc &TID = MI.getDesc();
1361 // Handle jump tables.
1362 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1363 // First emit a ldr pc, [] instruction.
1364 emitDataProcessingInstruction(MI, ARM::PC);
1366 // Then emit the inline jump table.
1368 (TID.Opcode == ARM::BR_JTr)
1369 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1370 emitInlineJumpTable(JTIndex);
1372 } else if (TID.Opcode == ARM::BR_JTm) {
1373 // First emit a ldr pc, [] instruction.
1374 emitLoadStoreInstruction(MI, ARM::PC);
1376 // Then emit the inline jump table.
1377 emitInlineJumpTable(MI.getOperand(3).getIndex());
1381 // Part of binary is determined by TableGn.
1382 unsigned Binary = getBinaryCodeForInstr(MI);
1384 // Set the conditional execution predicate
1385 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1387 if (TID.Opcode == ARM::BX_RET || TID.Opcode == ARM::MOVPCLR)
1388 // The return register is LR.
1389 Binary |= getARMRegisterNumbering(ARM::LR);
1391 // otherwise, set the return register
1392 Binary |= getMachineOpValue(MI, 0);
1397 static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1398 unsigned RegD = MI.getOperand(OpIdx).getReg();
1399 unsigned Binary = 0;
1400 bool isSPVFP = ARM::SPRRegisterClass->contains(RegD);
1401 RegD = getARMRegisterNumbering(RegD);
1403 Binary |= RegD << ARMII::RegRdShift;
1405 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1406 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1411 static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1412 unsigned RegN = MI.getOperand(OpIdx).getReg();
1413 unsigned Binary = 0;
1414 bool isSPVFP = ARM::SPRRegisterClass->contains(RegN);
1415 RegN = getARMRegisterNumbering(RegN);
1417 Binary |= RegN << ARMII::RegRnShift;
1419 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1420 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1425 static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1426 unsigned RegM = MI.getOperand(OpIdx).getReg();
1427 unsigned Binary = 0;
1428 bool isSPVFP = ARM::SPRRegisterClass->contains(RegM);
1429 RegM = getARMRegisterNumbering(RegM);
1433 Binary |= ((RegM & 0x1E) >> 1);
1434 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1439 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1440 const TargetInstrDesc &TID = MI.getDesc();
1442 // Part of binary is determined by TableGn.
1443 unsigned Binary = getBinaryCodeForInstr(MI);
1445 // Set the conditional execution predicate
1446 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1449 assert((Binary & ARMII::D_BitShift) == 0 &&
1450 (Binary & ARMII::N_BitShift) == 0 &&
1451 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1454 Binary |= encodeVFPRd(MI, OpIdx++);
1456 // If this is a two-address operand, skip it, e.g. FMACD.
1457 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1461 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1462 Binary |= encodeVFPRn(MI, OpIdx++);
1464 if (OpIdx == TID.getNumOperands() ||
1465 TID.OpInfo[OpIdx].isPredicate() ||
1466 TID.OpInfo[OpIdx].isOptionalDef()) {
1467 // FCMPEZD etc. has only one operand.
1473 Binary |= encodeVFPRm(MI, OpIdx);
1478 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1479 const TargetInstrDesc &TID = MI.getDesc();
1480 unsigned Form = TID.TSFlags & ARMII::FormMask;
1482 // Part of binary is determined by TableGn.
1483 unsigned Binary = getBinaryCodeForInstr(MI);
1485 // Set the conditional execution predicate
1486 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1490 case ARMII::VFPConv1Frm:
1491 case ARMII::VFPConv2Frm:
1492 case ARMII::VFPConv3Frm:
1494 Binary |= encodeVFPRd(MI, 0);
1496 case ARMII::VFPConv4Frm:
1498 Binary |= encodeVFPRn(MI, 0);
1500 case ARMII::VFPConv5Frm:
1502 Binary |= encodeVFPRm(MI, 0);
1508 case ARMII::VFPConv1Frm:
1510 Binary |= encodeVFPRm(MI, 1);
1512 case ARMII::VFPConv2Frm:
1513 case ARMII::VFPConv3Frm:
1515 Binary |= encodeVFPRn(MI, 1);
1517 case ARMII::VFPConv4Frm:
1518 case ARMII::VFPConv5Frm:
1520 Binary |= encodeVFPRd(MI, 1);
1524 if (Form == ARMII::VFPConv5Frm)
1526 Binary |= encodeVFPRn(MI, 2);
1527 else if (Form == ARMII::VFPConv3Frm)
1529 Binary |= encodeVFPRm(MI, 2);
1534 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1535 // Part of binary is determined by TableGn.
1536 unsigned Binary = getBinaryCodeForInstr(MI);
1538 // Set the conditional execution predicate
1539 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1544 Binary |= encodeVFPRd(MI, OpIdx++);
1546 // Encode address base.
1547 const MachineOperand &Base = MI.getOperand(OpIdx++);
1548 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1550 // If there is a non-zero immediate offset, encode it.
1552 const MachineOperand &Offset = MI.getOperand(OpIdx);
1553 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1554 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1555 Binary |= 1 << ARMII::U_BitShift;
1562 // If immediate offset is omitted, default to +0.
1563 Binary |= 1 << ARMII::U_BitShift;
1569 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1570 const TargetInstrDesc &TID = MI.getDesc();
1571 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1573 // Part of binary is determined by TableGn.
1574 unsigned Binary = getBinaryCodeForInstr(MI);
1576 // Set the conditional execution predicate
1577 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1579 // Skip operand 0 of an instruction with base register update.
1584 // Set base address operand
1585 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1587 // Set addressing mode by modifying bits U(23) and P(24)
1588 const MachineOperand &MO = MI.getOperand(OpIdx++);
1589 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1593 Binary |= 0x1 << ARMII::W_BitShift;
1595 // First register is encoded in Dd.
1596 Binary |= encodeVFPRd(MI, OpIdx+2);
1598 // Count the number of registers.
1599 unsigned NumRegs = 1;
1600 for (unsigned i = OpIdx+3, e = MI.getNumOperands(); i != e; ++i) {
1601 const MachineOperand &MO = MI.getOperand(i);
1602 if (!MO.isReg() || MO.isImplicit())
1606 // Bit 8 will be set if <list> is consecutive 64-bit registers (e.g., D0)
1607 // Otherwise, it will be 0, in the case of 32-bit registers.
1609 Binary |= NumRegs * 2;
1616 static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
1617 unsigned RegD = MI.getOperand(OpIdx).getReg();
1618 unsigned Binary = 0;
1619 RegD = getARMRegisterNumbering(RegD);
1620 Binary |= (RegD & 0xf) << ARMII::RegRdShift;
1621 Binary |= ((RegD >> 4) & 1) << ARMII::D_BitShift;
1625 static unsigned encodeNEONRn(const MachineInstr &MI, unsigned OpIdx) {
1626 unsigned RegN = MI.getOperand(OpIdx).getReg();
1627 unsigned Binary = 0;
1628 RegN = getARMRegisterNumbering(RegN);
1629 Binary |= (RegN & 0xf) << ARMII::RegRnShift;
1630 Binary |= ((RegN >> 4) & 1) << ARMII::N_BitShift;
1634 static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
1635 unsigned RegM = MI.getOperand(OpIdx).getReg();
1636 unsigned Binary = 0;
1637 RegM = getARMRegisterNumbering(RegM);
1638 Binary |= (RegM & 0xf);
1639 Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
1643 /// convertNEONDataProcToThumb - Convert the ARM mode encoding for a NEON
1644 /// data-processing instruction to the corresponding Thumb encoding.
1645 static unsigned convertNEONDataProcToThumb(unsigned Binary) {
1646 assert((Binary & 0xfe000000) == 0xf2000000 &&
1647 "not an ARM NEON data-processing instruction");
1648 unsigned UBit = (Binary >> 24) & 1;
1649 return 0xef000000 | (UBit << 28) | (Binary & 0xffffff);
1652 void ARMCodeEmitter::emitNEONLaneInstruction(const MachineInstr &MI) {
1653 unsigned Binary = getBinaryCodeForInstr(MI);
1655 unsigned RegTOpIdx, RegNOpIdx, LnOpIdx;
1656 const TargetInstrDesc &TID = MI.getDesc();
1657 if ((TID.TSFlags & ARMII::FormMask) == ARMII::NGetLnFrm) {
1661 } else { // ARMII::NSetLnFrm
1667 // Set the conditional execution predicate
1668 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1670 unsigned RegT = MI.getOperand(RegTOpIdx).getReg();
1671 RegT = getARMRegisterNumbering(RegT);
1672 Binary |= (RegT << ARMII::RegRdShift);
1673 Binary |= encodeNEONRn(MI, RegNOpIdx);
1676 if ((Binary & (1 << 22)) != 0)
1677 LaneShift = 0; // 8-bit elements
1678 else if ((Binary & (1 << 5)) != 0)
1679 LaneShift = 1; // 16-bit elements
1681 LaneShift = 2; // 32-bit elements
1683 unsigned Lane = MI.getOperand(LnOpIdx).getImm() << LaneShift;
1684 unsigned Opc1 = Lane >> 2;
1685 unsigned Opc2 = Lane & 3;
1686 assert((Opc1 & 3) == 0 && "out-of-range lane number operand");
1687 Binary |= (Opc1 << 21);
1688 Binary |= (Opc2 << 5);
1693 void ARMCodeEmitter::emitNEONDupInstruction(const MachineInstr &MI) {
1694 unsigned Binary = getBinaryCodeForInstr(MI);
1696 // Set the conditional execution predicate
1697 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1699 unsigned RegT = MI.getOperand(1).getReg();
1700 RegT = getARMRegisterNumbering(RegT);
1701 Binary |= (RegT << ARMII::RegRdShift);
1702 Binary |= encodeNEONRn(MI, 0);
1706 void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
1707 unsigned Binary = getBinaryCodeForInstr(MI);
1708 // Destination register is encoded in Dd.
1709 Binary |= encodeNEONRd(MI, 0);
1710 // Immediate fields: Op, Cmode, I, Imm3, Imm4
1711 unsigned Imm = MI.getOperand(1).getImm();
1712 unsigned Op = (Imm >> 12) & 1;
1713 unsigned Cmode = (Imm >> 8) & 0xf;
1714 unsigned I = (Imm >> 7) & 1;
1715 unsigned Imm3 = (Imm >> 4) & 0x7;
1716 unsigned Imm4 = Imm & 0xf;
1717 Binary |= (I << 24) | (Imm3 << 16) | (Cmode << 8) | (Op << 5) | Imm4;
1719 Binary = convertNEONDataProcToThumb(Binary);
1723 void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
1724 const TargetInstrDesc &TID = MI.getDesc();
1725 unsigned Binary = getBinaryCodeForInstr(MI);
1726 // Destination register is encoded in Dd; source register in Dm.
1728 Binary |= encodeNEONRd(MI, OpIdx++);
1729 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1731 Binary |= encodeNEONRm(MI, OpIdx);
1733 Binary = convertNEONDataProcToThumb(Binary);
1734 // FIXME: This does not handle VDUPfdf or VDUPfqf.
1738 void ARMCodeEmitter::emitNEON3RegInstruction(const MachineInstr &MI) {
1739 const TargetInstrDesc &TID = MI.getDesc();
1740 unsigned Binary = getBinaryCodeForInstr(MI);
1741 // Destination register is encoded in Dd; source registers in Dn and Dm.
1743 Binary |= encodeNEONRd(MI, OpIdx++);
1744 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1746 Binary |= encodeNEONRn(MI, OpIdx++);
1747 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1749 Binary |= encodeNEONRm(MI, OpIdx);
1751 Binary = convertNEONDataProcToThumb(Binary);
1752 // FIXME: This does not handle VMOVDneon or VMOVQ.
1756 #include "ARMGenCodeEmitter.inc"