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 getLdStSORegOpValue(const MachineInstr &MI, unsigned OpIdx)
183 unsigned getAddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
186 // {12} = (U)nsigned (add == '1', sub == '0')
188 const MachineOperand &MO = MI.getOperand(Op);
189 const MachineOperand &MO1 = MI.getOperand(Op + 1);
191 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
194 unsigned Reg = getARMRegisterNumbering(MO.getReg());
195 int32_t Imm12 = MO1.getImm();
197 Binary = Imm12 & 0xfff;
200 Binary |= (Reg << 13);
203 uint32_t getAddrMode5OpValue(const MachineInstr &MI, unsigned Op) const {
205 // {8} = (U)nsigned (add == '1', sub == '0')
207 const MachineOperand &MO = MI.getOperand(Op);
208 const MachineOperand &MO1 = MI.getOperand(Op + 1);
210 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
213 unsigned Reg = getARMRegisterNumbering(MO.getReg());
214 int32_t Imm8 = MO1.getImm();
216 Binary = Imm8 & 0xff;
219 Binary |= (Reg << 9);
222 unsigned getNEONVcvtImm32OpValue(const MachineInstr &MI, unsigned Op)
225 unsigned getRegisterListOpValue(const MachineInstr &MI, unsigned Op)
228 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
229 /// machine operand requires relocation, record the relocation and return
231 unsigned getMovi32Value(const MachineInstr &MI,const MachineOperand &MO,
234 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
236 unsigned getShiftOp(unsigned Imm) const ;
238 /// Routines that handle operands which add machine relocations which are
239 /// fixed up by the relocation stage.
240 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
241 bool MayNeedFarStub, bool Indirect,
242 intptr_t ACPV = 0) const;
243 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
244 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
245 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
246 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
247 intptr_t JTBase = 0) const;
251 char ARMCodeEmitter::ID = 0;
253 /// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
254 /// code to the specified MCE object.
255 FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
256 JITCodeEmitter &JCE) {
257 return new ARMCodeEmitter(TM, JCE);
260 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
261 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
262 MF.getTarget().getRelocationModel() != Reloc::Static) &&
263 "JIT relocation model must be set to static or default!");
264 JTI = ((ARMTargetMachine &)MF.getTarget()).getJITInfo();
265 II = ((const ARMTargetMachine &)MF.getTarget()).getInstrInfo();
266 TD = ((const ARMTargetMachine &)MF.getTarget()).getTargetData();
267 Subtarget = &TM.getSubtarget<ARMSubtarget>();
268 MCPEs = &MF.getConstantPool()->getConstants();
270 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
271 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
272 IsThumb = MF.getInfo<ARMFunctionInfo>()->isThumbFunction();
273 JTI->Initialize(MF, IsPIC);
274 MMI = &getAnalysis<MachineModuleInfo>();
275 MCE.setModuleInfo(MMI);
278 DEBUG(errs() << "JITTing function '"
279 << MF.getFunction()->getName() << "'\n");
280 MCE.startFunction(MF);
281 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
283 MCE.StartMachineBasicBlock(MBB);
284 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
288 } while (MCE.finishFunction(MF));
293 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
295 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
296 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
297 default: llvm_unreachable("Unknown shift opc!");
298 case ARM_AM::asr: return 2;
299 case ARM_AM::lsl: return 0;
300 case ARM_AM::lsr: return 1;
302 case ARM_AM::rrx: return 3;
307 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
308 /// machine operand requires relocation, record the relocation and return zero.
309 unsigned ARMCodeEmitter::getMovi32Value(const MachineInstr &MI,
310 const MachineOperand &MO,
312 assert(((Reloc == ARM::reloc_arm_movt) || (Reloc == ARM::reloc_arm_movw))
313 && "Relocation to this function should be for movt or movw");
316 return static_cast<unsigned>(MO.getImm());
317 else if (MO.isGlobal())
318 emitGlobalAddress(MO.getGlobal(), Reloc, true, false);
319 else if (MO.isSymbol())
320 emitExternalSymbolAddress(MO.getSymbolName(), Reloc);
322 emitMachineBasicBlock(MO.getMBB(), Reloc);
327 llvm_unreachable("Unsupported operand type for movw/movt");
332 /// getMachineOpValue - Return binary encoding of operand. If the machine
333 /// operand requires relocation, record the relocation and return zero.
334 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
335 const MachineOperand &MO) const {
337 return getARMRegisterNumbering(MO.getReg());
339 return static_cast<unsigned>(MO.getImm());
340 else if (MO.isGlobal())
341 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
342 else if (MO.isSymbol())
343 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
344 else if (MO.isCPI()) {
345 const TargetInstrDesc &TID = MI.getDesc();
346 // For VFP load, the immediate offset is multiplied by 4.
347 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
348 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
349 emitConstPoolAddress(MO.getIndex(), Reloc);
350 } else if (MO.isJTI())
351 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
353 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
363 /// emitGlobalAddress - Emit the specified address to the code stream.
365 void ARMCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
366 bool MayNeedFarStub, bool Indirect,
367 intptr_t ACPV) const {
368 MachineRelocation MR = Indirect
369 ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
370 const_cast<GlobalValue *>(GV),
371 ACPV, MayNeedFarStub)
372 : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
373 const_cast<GlobalValue *>(GV), ACPV,
375 MCE.addRelocation(MR);
378 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
379 /// be emitted to the current location in the function, and allow it to be PC
381 void ARMCodeEmitter::
382 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
383 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
387 /// emitConstPoolAddress - Arrange for the address of an constant pool
388 /// to be emitted to the current location in the function, and allow it to be PC
390 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
391 // Tell JIT emitter we'll resolve the address.
392 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
393 Reloc, CPI, 0, true));
396 /// emitJumpTableAddress - Arrange for the address of a jump table to
397 /// be emitted to the current location in the function, and allow it to be PC
399 void ARMCodeEmitter::
400 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
401 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
402 Reloc, JTIndex, 0, true));
405 /// emitMachineBasicBlock - Emit the specified address basic block.
406 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
408 intptr_t JTBase) const {
409 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
413 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
414 DEBUG(errs() << " 0x";
415 errs().write_hex(Binary) << "\n");
416 MCE.emitWordLE(Binary);
419 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
420 DEBUG(errs() << " 0x";
421 errs().write_hex(Binary) << "\n");
422 MCE.emitDWordLE(Binary);
425 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
426 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
428 MCE.processDebugLoc(MI.getDebugLoc(), true);
430 ++NumEmitted; // Keep track of the # of mi's emitted
431 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
433 llvm_unreachable("Unhandled instruction encoding format!");
437 emitPseudoInstruction(MI);
440 case ARMII::DPSoRegFrm:
441 emitDataProcessingInstruction(MI);
445 emitLoadStoreInstruction(MI);
447 case ARMII::LdMiscFrm:
448 case ARMII::StMiscFrm:
449 emitMiscLoadStoreInstruction(MI);
451 case ARMII::LdStMulFrm:
452 emitLoadStoreMultipleInstruction(MI);
455 emitMulFrmInstruction(MI);
458 emitExtendInstruction(MI);
460 case ARMII::ArithMiscFrm:
461 emitMiscArithInstruction(MI);
464 emitSaturateInstruction(MI);
467 emitBranchInstruction(MI);
469 case ARMII::BrMiscFrm:
470 emitMiscBranchInstruction(MI);
473 case ARMII::VFPUnaryFrm:
474 case ARMII::VFPBinaryFrm:
475 emitVFPArithInstruction(MI);
477 case ARMII::VFPConv1Frm:
478 case ARMII::VFPConv2Frm:
479 case ARMII::VFPConv3Frm:
480 case ARMII::VFPConv4Frm:
481 case ARMII::VFPConv5Frm:
482 emitVFPConversionInstruction(MI);
484 case ARMII::VFPLdStFrm:
485 emitVFPLoadStoreInstruction(MI);
487 case ARMII::VFPLdStMulFrm:
488 emitVFPLoadStoreMultipleInstruction(MI);
491 // NEON instructions.
492 case ARMII::NGetLnFrm:
493 case ARMII::NSetLnFrm:
494 emitNEONLaneInstruction(MI);
497 emitNEONDupInstruction(MI);
499 case ARMII::N1RegModImmFrm:
500 emitNEON1RegModImmInstruction(MI);
502 case ARMII::N2RegFrm:
503 emitNEON2RegInstruction(MI);
505 case ARMII::N3RegFrm:
506 emitNEON3RegInstruction(MI);
509 MCE.processDebugLoc(MI.getDebugLoc(), false);
512 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
513 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
514 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
515 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
517 // Remember the CONSTPOOL_ENTRY address for later relocation.
518 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
520 // Emit constpool island entry. In most cases, the actual values will be
521 // resolved and relocated after code emission.
522 if (MCPE.isMachineConstantPoolEntry()) {
523 ARMConstantPoolValue *ACPV =
524 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
526 DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
527 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
529 assert(ACPV->isGlobalValue() && "unsupported constant pool value");
530 const GlobalValue *GV = ACPV->getGV();
532 Reloc::Model RelocM = TM.getRelocationModel();
533 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
535 Subtarget->GVIsIndirectSymbol(GV, RelocM),
538 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
542 const Constant *CV = MCPE.Val.ConstVal;
545 errs() << " ** Constant pool #" << CPI << " @ "
546 << (void*)MCE.getCurrentPCValue() << " ";
547 if (const Function *F = dyn_cast<Function>(CV))
548 errs() << F->getName();
554 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
555 emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
557 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
558 uint32_t Val = uint32_t(*CI->getValue().getRawData());
560 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
561 if (CFP->getType()->isFloatTy())
562 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
563 else if (CFP->getType()->isDoubleTy())
564 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
566 llvm_unreachable("Unable to handle this constantpool entry!");
569 llvm_unreachable("Unable to handle this constantpool entry!");
574 void ARMCodeEmitter::emitMOVi32immInstruction(const MachineInstr &MI) {
575 const MachineOperand &MO0 = MI.getOperand(0);
576 const MachineOperand &MO1 = MI.getOperand(1);
578 // Emit the 'movw' instruction.
579 unsigned Binary = 0x30 << 20; // mov: Insts{27-20} = 0b00110000
581 unsigned Lo16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movw) & 0xFFFF;
583 // Set the conditional execution predicate.
584 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
587 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
589 // Encode imm16 as imm4:imm12
590 Binary |= Lo16 & 0xFFF; // Insts{11-0} = imm12
591 Binary |= ((Lo16 >> 12) & 0xF) << 16; // Insts{19-16} = imm4
594 unsigned Hi16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movt) >> 16;
595 // Emit the 'movt' instruction.
596 Binary = 0x34 << 20; // movt: Insts{27-20} = 0b00110100
598 // Set the conditional execution predicate.
599 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
602 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
604 // Encode imm16 as imm4:imm1, same as movw above.
605 Binary |= Hi16 & 0xFFF;
606 Binary |= ((Hi16 >> 12) & 0xF) << 16;
610 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
611 const MachineOperand &MO0 = MI.getOperand(0);
612 const MachineOperand &MO1 = MI.getOperand(1);
613 assert(MO1.isImm() && ARM_AM::isSOImmTwoPartVal(MO1.getImm()) &&
614 "Not a valid so_imm value!");
615 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
616 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
618 // Emit the 'mov' instruction.
619 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
621 // Set the conditional execution predicate.
622 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
625 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
628 // Set bit I(25) to identify this is the immediate form of <shifter_op>
629 Binary |= 1 << ARMII::I_BitShift;
630 Binary |= getMachineSoImmOpValue(V1);
633 // Now the 'orr' instruction.
634 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
636 // Set the conditional execution predicate.
637 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
640 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
643 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
646 // Set bit I(25) to identify this is the immediate form of <shifter_op>
647 Binary |= 1 << ARMII::I_BitShift;
648 Binary |= getMachineSoImmOpValue(V2);
652 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
653 // It's basically add r, pc, (LJTI - $+8)
655 const TargetInstrDesc &TID = MI.getDesc();
657 // Emit the 'add' instruction.
658 unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
660 // Set the conditional execution predicate
661 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
663 // Encode S bit if MI modifies CPSR.
664 Binary |= getAddrModeSBit(MI, TID);
667 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
669 // Encode Rn which is PC.
670 Binary |= getARMRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
672 // Encode the displacement.
673 Binary |= 1 << ARMII::I_BitShift;
674 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
679 void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
680 unsigned Opcode = MI.getDesc().Opcode;
682 // Part of binary is determined by TableGn.
683 unsigned Binary = getBinaryCodeForInstr(MI);
685 // Set the conditional execution predicate
686 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
688 // Encode S bit if MI modifies CPSR.
689 if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
690 Binary |= 1 << ARMII::S_BitShift;
692 // Encode register def if there is one.
693 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
695 // Encode the shift operation.
702 case ARM::MOVsrl_flag:
704 Binary |= (0x2 << 4) | (1 << 7);
706 case ARM::MOVsra_flag:
708 Binary |= (0x4 << 4) | (1 << 7);
712 // Encode register Rm.
713 Binary |= getMachineOpValue(MI, 1);
718 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
719 DEBUG(errs() << " ** LPC" << LabelID << " @ "
720 << (void*)MCE.getCurrentPCValue() << '\n');
721 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
724 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
725 unsigned Opcode = MI.getDesc().Opcode;
728 llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
732 case ARM::BMOVPCRXr9: {
733 // First emit mov lr, pc
734 unsigned Binary = 0x01a0e00f;
735 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
738 // and then emit the branch.
739 emitMiscBranchInstruction(MI);
742 case TargetOpcode::INLINEASM: {
743 // We allow inline assembler nodes with empty bodies - they can
744 // implicitly define registers, which is ok for JIT.
745 if (MI.getOperand(0).getSymbolName()[0]) {
746 report_fatal_error("JIT does not support inline asm!");
750 case TargetOpcode::PROLOG_LABEL:
751 case TargetOpcode::EH_LABEL:
752 MCE.emitLabel(MI.getOperand(0).getMCSymbol());
754 case TargetOpcode::IMPLICIT_DEF:
755 case TargetOpcode::KILL:
758 case ARM::CONSTPOOL_ENTRY:
759 emitConstPoolInstruction(MI);
762 // Remember of the address of the PC label for relocation later.
763 addPCLabel(MI.getOperand(2).getImm());
764 // PICADD is just an add instruction that implicitly read pc.
765 emitDataProcessingInstruction(MI, 0, ARM::PC);
772 // Remember of the address of the PC label for relocation later.
773 addPCLabel(MI.getOperand(2).getImm());
774 // These are just load / store instructions that implicitly read pc.
775 emitLoadStoreInstruction(MI, 0, ARM::PC);
782 // Remember of the address of the PC label for relocation later.
783 addPCLabel(MI.getOperand(2).getImm());
784 // These are just load / store instructions that implicitly read pc.
785 emitMiscLoadStoreInstruction(MI, ARM::PC);
790 emitMOVi32immInstruction(MI);
793 case ARM::MOVi2pieces:
794 // Two instructions to materialize a constant.
795 emitMOVi2piecesInstruction(MI);
797 case ARM::LEApcrelJT:
798 // Materialize jumptable address.
799 emitLEApcrelJTInstruction(MI);
802 case ARM::MOVsrl_flag:
803 case ARM::MOVsra_flag:
804 emitPseudoMoveInstruction(MI);
809 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
810 const TargetInstrDesc &TID,
811 const MachineOperand &MO,
813 unsigned Binary = getMachineOpValue(MI, MO);
815 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
816 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
817 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
819 // Encode the shift opcode.
821 unsigned Rs = MO1.getReg();
823 // Set shift operand (bit[7:4]).
828 // RRX - 0110 and bit[11:8] clear.
830 default: llvm_unreachable("Unknown shift opc!");
831 case ARM_AM::lsl: SBits = 0x1; break;
832 case ARM_AM::lsr: SBits = 0x3; break;
833 case ARM_AM::asr: SBits = 0x5; break;
834 case ARM_AM::ror: SBits = 0x7; break;
835 case ARM_AM::rrx: SBits = 0x6; break;
838 // Set shift operand (bit[6:4]).
844 default: llvm_unreachable("Unknown shift opc!");
845 case ARM_AM::lsl: SBits = 0x0; break;
846 case ARM_AM::lsr: SBits = 0x2; break;
847 case ARM_AM::asr: SBits = 0x4; break;
848 case ARM_AM::ror: SBits = 0x6; break;
851 Binary |= SBits << 4;
852 if (SOpc == ARM_AM::rrx)
855 // Encode the shift operation Rs or shift_imm (except rrx).
857 // Encode Rs bit[11:8].
858 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
859 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
862 // Encode shift_imm bit[11:7].
863 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
866 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
867 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
868 assert(SoImmVal != -1 && "Not a valid so_imm value!");
870 // Encode rotate_imm.
871 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
872 << ARMII::SoRotImmShift;
875 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
879 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
880 const TargetInstrDesc &TID) const {
881 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
882 const MachineOperand &MO = MI.getOperand(i-1);
883 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
884 return 1 << ARMII::S_BitShift;
889 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
891 unsigned ImplicitRn) {
892 const TargetInstrDesc &TID = MI.getDesc();
894 // Part of binary is determined by TableGn.
895 unsigned Binary = getBinaryCodeForInstr(MI);
897 // Set the conditional execution predicate
898 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
900 // Encode S bit if MI modifies CPSR.
901 Binary |= getAddrModeSBit(MI, TID);
903 // Encode register def if there is one.
904 unsigned NumDefs = TID.getNumDefs();
907 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
909 // Special handling for implicit use (e.g. PC).
910 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
912 if (TID.Opcode == ARM::MOVi16) {
913 // Get immediate from MI.
914 unsigned Lo16 = getMovi32Value(MI, MI.getOperand(OpIdx),
915 ARM::reloc_arm_movw);
916 // Encode imm which is the same as in emitMOVi32immInstruction().
917 Binary |= Lo16 & 0xFFF;
918 Binary |= ((Lo16 >> 12) & 0xF) << 16;
921 } else if(TID.Opcode == ARM::MOVTi16) {
922 unsigned Hi16 = (getMovi32Value(MI, MI.getOperand(OpIdx),
923 ARM::reloc_arm_movt) >> 16);
924 Binary |= Hi16 & 0xFFF;
925 Binary |= ((Hi16 >> 12) & 0xF) << 16;
928 } else if ((TID.Opcode == ARM::BFC) || (TID.Opcode == ARM::BFI)) {
929 uint32_t v = ~MI.getOperand(2).getImm();
930 int32_t lsb = CountTrailingZeros_32(v);
931 int32_t msb = (32 - CountLeadingZeros_32(v)) - 1;
932 // Instr{20-16} = msb, Instr{11-7} = lsb
933 Binary |= (msb & 0x1F) << 16;
934 Binary |= (lsb & 0x1F) << 7;
937 } else if ((TID.Opcode == ARM::UBFX) || (TID.Opcode == ARM::SBFX)) {
938 // Encode Rn in Instr{0-3}
939 Binary |= getMachineOpValue(MI, OpIdx++);
941 uint32_t lsb = MI.getOperand(OpIdx++).getImm();
942 uint32_t widthm1 = MI.getOperand(OpIdx++).getImm() - 1;
944 // Instr{20-16} = widthm1, Instr{11-7} = lsb
945 Binary |= (widthm1 & 0x1F) << 16;
946 Binary |= (lsb & 0x1F) << 7;
951 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
952 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
955 // Encode first non-shifter register operand if there is one.
956 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
959 // Special handling for implicit use (e.g. PC).
960 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
962 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
967 // Encode shifter operand.
968 const MachineOperand &MO = MI.getOperand(OpIdx);
969 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
971 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
976 // Encode register Rm.
977 emitWordLE(Binary | getARMRegisterNumbering(MO.getReg()));
982 Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
987 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
989 unsigned ImplicitRn) {
990 const TargetInstrDesc &TID = MI.getDesc();
991 unsigned Form = TID.TSFlags & ARMII::FormMask;
992 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
994 // Part of binary is determined by TableGn.
995 unsigned Binary = getBinaryCodeForInstr(MI);
997 // If this is an LDRi12, STRi12 or LDRcp, nothing more needs be done.
998 if (MI.getOpcode() == ARM::LDRi12 || MI.getOpcode() == ARM::LDRcp ||
999 MI.getOpcode() == ARM::STRi12) {
1004 // Set the conditional execution predicate
1005 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1009 // Operand 0 of a pre- and post-indexed store is the address base
1010 // writeback. Skip it.
1011 bool Skipped = false;
1012 if (IsPrePost && Form == ARMII::StFrm) {
1017 // Set first operand
1019 // Special handling for implicit use (e.g. PC).
1020 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
1022 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1024 // Set second operand
1026 // Special handling for implicit use (e.g. PC).
1027 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1029 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1031 // If this is a two-address operand, skip it. e.g. LDR_PRE.
1032 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1035 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1036 unsigned AM2Opc = (ImplicitRn == ARM::PC)
1037 ? 0 : MI.getOperand(OpIdx+1).getImm();
1039 // Set bit U(23) according to sign of immed value (positive or negative).
1040 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
1042 if (!MO2.getReg()) { // is immediate
1043 if (ARM_AM::getAM2Offset(AM2Opc))
1044 // Set the value of offset_12 field
1045 Binary |= ARM_AM::getAM2Offset(AM2Opc);
1050 // Set bit I(25), because this is not in immediate encoding.
1051 Binary |= 1 << ARMII::I_BitShift;
1052 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
1053 // Set bit[3:0] to the corresponding Rm register
1054 Binary |= getARMRegisterNumbering(MO2.getReg());
1056 // If this instr is in scaled register offset/index instruction, set
1057 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
1058 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
1059 Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
1060 Binary |= ShImm << ARMII::ShiftShift; // shift_immed
1066 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
1067 unsigned ImplicitRn) {
1068 const TargetInstrDesc &TID = MI.getDesc();
1069 unsigned Form = TID.TSFlags & ARMII::FormMask;
1070 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1072 // Part of binary is determined by TableGn.
1073 unsigned Binary = getBinaryCodeForInstr(MI);
1075 // Set the conditional execution predicate
1076 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1080 // Operand 0 of a pre- and post-indexed store is the address base
1081 // writeback. Skip it.
1082 bool Skipped = false;
1083 if (IsPrePost && Form == ARMII::StMiscFrm) {
1088 // Set first operand
1089 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1091 // Skip LDRD and STRD's second operand.
1092 if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
1095 // Set second operand
1097 // Special handling for implicit use (e.g. PC).
1098 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1100 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1102 // If this is a two-address operand, skip it. e.g. LDRH_POST.
1103 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1106 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1107 unsigned AM3Opc = (ImplicitRn == ARM::PC)
1108 ? 0 : MI.getOperand(OpIdx+1).getImm();
1110 // Set bit U(23) according to sign of immed value (positive or negative)
1111 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
1114 // If this instr is in register offset/index encoding, set bit[3:0]
1115 // to the corresponding Rm register.
1117 Binary |= getARMRegisterNumbering(MO2.getReg());
1122 // This instr is in immediate offset/index encoding, set bit 22 to 1.
1123 Binary |= 1 << ARMII::AM3_I_BitShift;
1124 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
1126 Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
1127 Binary |= (ImmOffs & 0xF); // immedL
1133 static unsigned getAddrModeUPBits(unsigned Mode) {
1134 unsigned Binary = 0;
1136 // Set addressing mode by modifying bits U(23) and P(24)
1137 // IA - Increment after - bit U = 1 and bit P = 0
1138 // IB - Increment before - bit U = 1 and bit P = 1
1139 // DA - Decrement after - bit U = 0 and bit P = 0
1140 // DB - Decrement before - bit U = 0 and bit P = 1
1142 default: llvm_unreachable("Unknown addressing sub-mode!");
1143 case ARM_AM::da: break;
1144 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
1145 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
1146 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
1152 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
1153 const TargetInstrDesc &TID = MI.getDesc();
1154 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1156 // Part of binary is determined by TableGn.
1157 unsigned Binary = getBinaryCodeForInstr(MI);
1159 // Set the conditional execution predicate
1160 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1162 // Skip operand 0 of an instruction with base register update.
1167 // Set base address operand
1168 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1170 // Set addressing mode by modifying bits U(23) and P(24)
1171 const MachineOperand &MO = MI.getOperand(OpIdx++);
1172 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1176 Binary |= 0x1 << ARMII::W_BitShift;
1179 for (unsigned i = OpIdx+2, e = MI.getNumOperands(); i != e; ++i) {
1180 const MachineOperand &MO = MI.getOperand(i);
1181 if (!MO.isReg() || MO.isImplicit())
1183 unsigned RegNum = getARMRegisterNumbering(MO.getReg());
1184 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
1186 Binary |= 0x1 << RegNum;
1192 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
1193 const TargetInstrDesc &TID = MI.getDesc();
1195 // Part of binary is determined by TableGn.
1196 unsigned Binary = getBinaryCodeForInstr(MI);
1198 // Set the conditional execution predicate
1199 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1201 // Encode S bit if MI modifies CPSR.
1202 Binary |= getAddrModeSBit(MI, TID);
1204 // 32x32->64bit operations have two destination registers. The number
1205 // of register definitions will tell us if that's what we're dealing with.
1207 if (TID.getNumDefs() == 2)
1208 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
1211 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
1214 Binary |= getMachineOpValue(MI, OpIdx++);
1217 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
1219 // Many multiple instructions (e.g. MLA) have three src operands. Encode
1220 // it as Rn (for multiply, that's in the same offset as RdLo.
1221 if (TID.getNumOperands() > OpIdx &&
1222 !TID.OpInfo[OpIdx].isPredicate() &&
1223 !TID.OpInfo[OpIdx].isOptionalDef())
1224 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
1229 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
1230 const TargetInstrDesc &TID = MI.getDesc();
1232 // Part of binary is determined by TableGn.
1233 unsigned Binary = getBinaryCodeForInstr(MI);
1235 // Set the conditional execution predicate
1236 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1241 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1243 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1244 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1246 // Two register operand form.
1248 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1251 Binary |= getMachineOpValue(MI, MO2);
1254 Binary |= getMachineOpValue(MI, MO1);
1257 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1258 if (MI.getOperand(OpIdx).isImm() &&
1259 !TID.OpInfo[OpIdx].isPredicate() &&
1260 !TID.OpInfo[OpIdx].isOptionalDef())
1261 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1266 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1267 const TargetInstrDesc &TID = MI.getDesc();
1269 // Part of binary is determined by TableGn.
1270 unsigned Binary = getBinaryCodeForInstr(MI);
1272 // Set the conditional execution predicate
1273 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1278 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1280 const MachineOperand &MO = MI.getOperand(OpIdx++);
1281 if (OpIdx == TID.getNumOperands() ||
1282 TID.OpInfo[OpIdx].isPredicate() ||
1283 TID.OpInfo[OpIdx].isOptionalDef()) {
1284 // Encode Rm and it's done.
1285 Binary |= getMachineOpValue(MI, MO);
1291 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1294 Binary |= getMachineOpValue(MI, OpIdx++);
1296 // Encode shift_imm.
1297 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1298 if (TID.Opcode == ARM::PKHTB) {
1299 assert(ShiftAmt != 0 && "PKHTB shift_imm is 0!");
1303 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1304 Binary |= ShiftAmt << ARMII::ShiftShift;
1309 void ARMCodeEmitter::emitSaturateInstruction(const MachineInstr &MI) {
1310 const TargetInstrDesc &TID = MI.getDesc();
1312 // Part of binary is determined by TableGen.
1313 unsigned Binary = getBinaryCodeForInstr(MI);
1315 // Set the conditional execution predicate
1316 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1319 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
1321 // Encode saturate bit position.
1322 unsigned Pos = MI.getOperand(1).getImm();
1323 if (TID.Opcode == ARM::SSAT || TID.Opcode == ARM::SSAT16)
1325 assert((Pos < 16 || (Pos < 32 &&
1326 TID.Opcode != ARM::SSAT16 &&
1327 TID.Opcode != ARM::USAT16)) &&
1328 "saturate bit position out of range");
1329 Binary |= Pos << 16;
1332 Binary |= getMachineOpValue(MI, 2);
1334 // Encode shift_imm.
1335 if (TID.getNumOperands() == 4) {
1336 unsigned ShiftOp = MI.getOperand(3).getImm();
1337 ARM_AM::ShiftOpc Opc = ARM_AM::getSORegShOp(ShiftOp);
1338 if (Opc == ARM_AM::asr)
1340 unsigned ShiftAmt = MI.getOperand(3).getImm();
1341 if (ShiftAmt == 32 && Opc == ARM_AM::asr)
1343 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1344 Binary |= ShiftAmt << ARMII::ShiftShift;
1350 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1351 const TargetInstrDesc &TID = MI.getDesc();
1353 if (TID.Opcode == ARM::TPsoft) {
1354 llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1357 // Part of binary is determined by TableGn.
1358 unsigned Binary = getBinaryCodeForInstr(MI);
1360 // Set the conditional execution predicate
1361 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1363 // Set signed_immed_24 field
1364 Binary |= getMachineOpValue(MI, 0);
1369 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1370 // Remember the base address of the inline jump table.
1371 uintptr_t JTBase = MCE.getCurrentPCValue();
1372 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1373 DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1376 // Now emit the jump table entries.
1377 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1378 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1380 // DestBB address - JT base.
1381 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1383 // Absolute DestBB address.
1384 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1389 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1390 const TargetInstrDesc &TID = MI.getDesc();
1392 // Handle jump tables.
1393 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1394 // First emit a ldr pc, [] instruction.
1395 emitDataProcessingInstruction(MI, ARM::PC);
1397 // Then emit the inline jump table.
1399 (TID.Opcode == ARM::BR_JTr)
1400 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1401 emitInlineJumpTable(JTIndex);
1403 } else if (TID.Opcode == ARM::BR_JTm) {
1404 // First emit a ldr pc, [] instruction.
1405 emitLoadStoreInstruction(MI, ARM::PC);
1407 // Then emit the inline jump table.
1408 emitInlineJumpTable(MI.getOperand(3).getIndex());
1412 // Part of binary is determined by TableGn.
1413 unsigned Binary = getBinaryCodeForInstr(MI);
1415 // Set the conditional execution predicate
1416 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1418 if (TID.Opcode == ARM::BX_RET || TID.Opcode == ARM::MOVPCLR)
1419 // The return register is LR.
1420 Binary |= getARMRegisterNumbering(ARM::LR);
1422 // otherwise, set the return register
1423 Binary |= getMachineOpValue(MI, 0);
1428 static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1429 unsigned RegD = MI.getOperand(OpIdx).getReg();
1430 unsigned Binary = 0;
1431 bool isSPVFP = ARM::SPRRegisterClass->contains(RegD);
1432 RegD = getARMRegisterNumbering(RegD);
1434 Binary |= RegD << ARMII::RegRdShift;
1436 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1437 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1442 static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1443 unsigned RegN = MI.getOperand(OpIdx).getReg();
1444 unsigned Binary = 0;
1445 bool isSPVFP = ARM::SPRRegisterClass->contains(RegN);
1446 RegN = getARMRegisterNumbering(RegN);
1448 Binary |= RegN << ARMII::RegRnShift;
1450 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1451 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1456 static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1457 unsigned RegM = MI.getOperand(OpIdx).getReg();
1458 unsigned Binary = 0;
1459 bool isSPVFP = ARM::SPRRegisterClass->contains(RegM);
1460 RegM = getARMRegisterNumbering(RegM);
1464 Binary |= ((RegM & 0x1E) >> 1);
1465 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1470 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1471 const TargetInstrDesc &TID = MI.getDesc();
1473 // Part of binary is determined by TableGn.
1474 unsigned Binary = getBinaryCodeForInstr(MI);
1476 // Set the conditional execution predicate
1477 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1480 assert((Binary & ARMII::D_BitShift) == 0 &&
1481 (Binary & ARMII::N_BitShift) == 0 &&
1482 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1485 Binary |= encodeVFPRd(MI, OpIdx++);
1487 // If this is a two-address operand, skip it, e.g. FMACD.
1488 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1492 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1493 Binary |= encodeVFPRn(MI, OpIdx++);
1495 if (OpIdx == TID.getNumOperands() ||
1496 TID.OpInfo[OpIdx].isPredicate() ||
1497 TID.OpInfo[OpIdx].isOptionalDef()) {
1498 // FCMPEZD etc. has only one operand.
1504 Binary |= encodeVFPRm(MI, OpIdx);
1509 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1510 const TargetInstrDesc &TID = MI.getDesc();
1511 unsigned Form = TID.TSFlags & ARMII::FormMask;
1513 // Part of binary is determined by TableGn.
1514 unsigned Binary = getBinaryCodeForInstr(MI);
1516 // Set the conditional execution predicate
1517 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1521 case ARMII::VFPConv1Frm:
1522 case ARMII::VFPConv2Frm:
1523 case ARMII::VFPConv3Frm:
1525 Binary |= encodeVFPRd(MI, 0);
1527 case ARMII::VFPConv4Frm:
1529 Binary |= encodeVFPRn(MI, 0);
1531 case ARMII::VFPConv5Frm:
1533 Binary |= encodeVFPRm(MI, 0);
1539 case ARMII::VFPConv1Frm:
1541 Binary |= encodeVFPRm(MI, 1);
1543 case ARMII::VFPConv2Frm:
1544 case ARMII::VFPConv3Frm:
1546 Binary |= encodeVFPRn(MI, 1);
1548 case ARMII::VFPConv4Frm:
1549 case ARMII::VFPConv5Frm:
1551 Binary |= encodeVFPRd(MI, 1);
1555 if (Form == ARMII::VFPConv5Frm)
1557 Binary |= encodeVFPRn(MI, 2);
1558 else if (Form == ARMII::VFPConv3Frm)
1560 Binary |= encodeVFPRm(MI, 2);
1565 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1566 // Part of binary is determined by TableGn.
1567 unsigned Binary = getBinaryCodeForInstr(MI);
1569 // Set the conditional execution predicate
1570 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1575 Binary |= encodeVFPRd(MI, OpIdx++);
1577 // Encode address base.
1578 const MachineOperand &Base = MI.getOperand(OpIdx++);
1579 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1581 // If there is a non-zero immediate offset, encode it.
1583 const MachineOperand &Offset = MI.getOperand(OpIdx);
1584 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1585 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1586 Binary |= 1 << ARMII::U_BitShift;
1593 // If immediate offset is omitted, default to +0.
1594 Binary |= 1 << ARMII::U_BitShift;
1600 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1601 const TargetInstrDesc &TID = MI.getDesc();
1602 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1604 // Part of binary is determined by TableGn.
1605 unsigned Binary = getBinaryCodeForInstr(MI);
1607 // Set the conditional execution predicate
1608 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1610 // Skip operand 0 of an instruction with base register update.
1615 // Set base address operand
1616 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1618 // Set addressing mode by modifying bits U(23) and P(24)
1619 const MachineOperand &MO = MI.getOperand(OpIdx++);
1620 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
1624 Binary |= 0x1 << ARMII::W_BitShift;
1626 // First register is encoded in Dd.
1627 Binary |= encodeVFPRd(MI, OpIdx+2);
1629 // Count the number of registers.
1630 unsigned NumRegs = 1;
1631 for (unsigned i = OpIdx+3, e = MI.getNumOperands(); i != e; ++i) {
1632 const MachineOperand &MO = MI.getOperand(i);
1633 if (!MO.isReg() || MO.isImplicit())
1637 // Bit 8 will be set if <list> is consecutive 64-bit registers (e.g., D0)
1638 // Otherwise, it will be 0, in the case of 32-bit registers.
1640 Binary |= NumRegs * 2;
1647 static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
1648 unsigned RegD = MI.getOperand(OpIdx).getReg();
1649 unsigned Binary = 0;
1650 RegD = getARMRegisterNumbering(RegD);
1651 Binary |= (RegD & 0xf) << ARMII::RegRdShift;
1652 Binary |= ((RegD >> 4) & 1) << ARMII::D_BitShift;
1656 static unsigned encodeNEONRn(const MachineInstr &MI, unsigned OpIdx) {
1657 unsigned RegN = MI.getOperand(OpIdx).getReg();
1658 unsigned Binary = 0;
1659 RegN = getARMRegisterNumbering(RegN);
1660 Binary |= (RegN & 0xf) << ARMII::RegRnShift;
1661 Binary |= ((RegN >> 4) & 1) << ARMII::N_BitShift;
1665 static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
1666 unsigned RegM = MI.getOperand(OpIdx).getReg();
1667 unsigned Binary = 0;
1668 RegM = getARMRegisterNumbering(RegM);
1669 Binary |= (RegM & 0xf);
1670 Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
1674 /// convertNEONDataProcToThumb - Convert the ARM mode encoding for a NEON
1675 /// data-processing instruction to the corresponding Thumb encoding.
1676 static unsigned convertNEONDataProcToThumb(unsigned Binary) {
1677 assert((Binary & 0xfe000000) == 0xf2000000 &&
1678 "not an ARM NEON data-processing instruction");
1679 unsigned UBit = (Binary >> 24) & 1;
1680 return 0xef000000 | (UBit << 28) | (Binary & 0xffffff);
1683 void ARMCodeEmitter::emitNEONLaneInstruction(const MachineInstr &MI) {
1684 unsigned Binary = getBinaryCodeForInstr(MI);
1686 unsigned RegTOpIdx, RegNOpIdx, LnOpIdx;
1687 const TargetInstrDesc &TID = MI.getDesc();
1688 if ((TID.TSFlags & ARMII::FormMask) == ARMII::NGetLnFrm) {
1692 } else { // ARMII::NSetLnFrm
1698 // Set the conditional execution predicate
1699 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1701 unsigned RegT = MI.getOperand(RegTOpIdx).getReg();
1702 RegT = getARMRegisterNumbering(RegT);
1703 Binary |= (RegT << ARMII::RegRdShift);
1704 Binary |= encodeNEONRn(MI, RegNOpIdx);
1707 if ((Binary & (1 << 22)) != 0)
1708 LaneShift = 0; // 8-bit elements
1709 else if ((Binary & (1 << 5)) != 0)
1710 LaneShift = 1; // 16-bit elements
1712 LaneShift = 2; // 32-bit elements
1714 unsigned Lane = MI.getOperand(LnOpIdx).getImm() << LaneShift;
1715 unsigned Opc1 = Lane >> 2;
1716 unsigned Opc2 = Lane & 3;
1717 assert((Opc1 & 3) == 0 && "out-of-range lane number operand");
1718 Binary |= (Opc1 << 21);
1719 Binary |= (Opc2 << 5);
1724 void ARMCodeEmitter::emitNEONDupInstruction(const MachineInstr &MI) {
1725 unsigned Binary = getBinaryCodeForInstr(MI);
1727 // Set the conditional execution predicate
1728 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1730 unsigned RegT = MI.getOperand(1).getReg();
1731 RegT = getARMRegisterNumbering(RegT);
1732 Binary |= (RegT << ARMII::RegRdShift);
1733 Binary |= encodeNEONRn(MI, 0);
1737 void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
1738 unsigned Binary = getBinaryCodeForInstr(MI);
1739 // Destination register is encoded in Dd.
1740 Binary |= encodeNEONRd(MI, 0);
1741 // Immediate fields: Op, Cmode, I, Imm3, Imm4
1742 unsigned Imm = MI.getOperand(1).getImm();
1743 unsigned Op = (Imm >> 12) & 1;
1744 unsigned Cmode = (Imm >> 8) & 0xf;
1745 unsigned I = (Imm >> 7) & 1;
1746 unsigned Imm3 = (Imm >> 4) & 0x7;
1747 unsigned Imm4 = Imm & 0xf;
1748 Binary |= (I << 24) | (Imm3 << 16) | (Cmode << 8) | (Op << 5) | Imm4;
1750 Binary = convertNEONDataProcToThumb(Binary);
1754 void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
1755 const TargetInstrDesc &TID = MI.getDesc();
1756 unsigned Binary = getBinaryCodeForInstr(MI);
1757 // Destination register is encoded in Dd; source register in Dm.
1759 Binary |= encodeNEONRd(MI, OpIdx++);
1760 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1762 Binary |= encodeNEONRm(MI, OpIdx);
1764 Binary = convertNEONDataProcToThumb(Binary);
1765 // FIXME: This does not handle VDUPfdf or VDUPfqf.
1769 void ARMCodeEmitter::emitNEON3RegInstruction(const MachineInstr &MI) {
1770 const TargetInstrDesc &TID = MI.getDesc();
1771 unsigned Binary = getBinaryCodeForInstr(MI);
1772 // Destination register is encoded in Dd; source registers in Dn and Dm.
1774 Binary |= encodeNEONRd(MI, OpIdx++);
1775 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1777 Binary |= encodeNEONRn(MI, OpIdx++);
1778 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1780 Binary |= encodeNEONRm(MI, OpIdx);
1782 Binary = convertNEONDataProcToThumb(Binary);
1783 // FIXME: This does not handle VMOVDneon or VMOVQ.
1787 #include "ARMGenCodeEmitter.inc"