1 //===-- ARM/ARMCodeEmitter.cpp - Convert ARM code to machine code ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the pass that transforms the ARM machine instructions into
11 // relocatable machine code.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
17 #include "ARMAddressingModes.h"
18 #include "ARMConstantPoolValue.h"
19 #include "ARMInstrInfo.h"
20 #include "ARMRelocations.h"
21 #include "ARMSubtarget.h"
22 #include "ARMTargetMachine.h"
23 #include "llvm/Constants.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Function.h"
26 #include "llvm/PassManager.h"
27 #include "llvm/CodeGen/JITCodeEmitter.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFunctionPass.h"
30 #include "llvm/CodeGen/MachineInstr.h"
31 #include "llvm/CodeGen/MachineJumpTableInfo.h"
32 #include "llvm/CodeGen/MachineModuleInfo.h"
33 #include "llvm/CodeGen/Passes.h"
34 #include "llvm/ADT/Statistic.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/raw_ostream.h"
43 STATISTIC(NumEmitted, "Number of machine instructions emitted");
47 class ARMCodeEmitter : public MachineFunctionPass {
49 const ARMInstrInfo *II;
51 const ARMSubtarget *Subtarget;
54 MachineModuleInfo *MMI;
55 const std::vector<MachineConstantPoolEntry> *MCPEs;
56 const std::vector<MachineJumpTableEntry> *MJTEs;
60 void getAnalysisUsage(AnalysisUsage &AU) const {
61 AU.addRequired<MachineModuleInfo>();
62 MachineFunctionPass::getAnalysisUsage(AU);
67 ARMCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce)
68 : MachineFunctionPass(ID), JTI(0),
69 II((const ARMInstrInfo *)tm.getInstrInfo()),
70 TD(tm.getTargetData()), TM(tm),
71 MCE(mce), MCPEs(0), MJTEs(0),
72 IsPIC(TM.getRelocationModel() == Reloc::PIC_), IsThumb(false) {}
74 /// getBinaryCodeForInstr - This function, generated by the
75 /// CodeEmitterGenerator using TableGen, produces the binary encoding for
76 /// machine instructions.
77 unsigned getBinaryCodeForInstr(const MachineInstr &MI) const;
79 bool runOnMachineFunction(MachineFunction &MF);
81 virtual const char *getPassName() const {
82 return "ARM Machine Code Emitter";
85 void emitInstruction(const MachineInstr &MI);
89 void emitWordLE(unsigned Binary);
90 void emitDWordLE(uint64_t Binary);
91 void emitConstPoolInstruction(const MachineInstr &MI);
92 void emitMOVi32immInstruction(const MachineInstr &MI);
93 void emitMOVi2piecesInstruction(const MachineInstr &MI);
94 void emitLEApcrelJTInstruction(const MachineInstr &MI);
95 void emitPseudoMoveInstruction(const MachineInstr &MI);
96 void addPCLabel(unsigned LabelID);
97 void emitPseudoInstruction(const MachineInstr &MI);
98 unsigned getMachineSoRegOpValue(const MachineInstr &MI,
99 const TargetInstrDesc &TID,
100 const MachineOperand &MO,
103 unsigned getMachineSoImmOpValue(unsigned SoImm);
104 unsigned getAddrModeSBit(const MachineInstr &MI,
105 const TargetInstrDesc &TID) const;
107 void emitDataProcessingInstruction(const MachineInstr &MI,
108 unsigned ImplicitRd = 0,
109 unsigned ImplicitRn = 0);
111 void emitLoadStoreInstruction(const MachineInstr &MI,
112 unsigned ImplicitRd = 0,
113 unsigned ImplicitRn = 0);
115 void emitMiscLoadStoreInstruction(const MachineInstr &MI,
116 unsigned ImplicitRn = 0);
118 void emitLoadStoreMultipleInstruction(const MachineInstr &MI);
120 void emitMulFrmInstruction(const MachineInstr &MI);
122 void emitExtendInstruction(const MachineInstr &MI);
124 void emitMiscArithInstruction(const MachineInstr &MI);
126 void emitSaturateInstruction(const MachineInstr &MI);
128 void emitBranchInstruction(const MachineInstr &MI);
130 void emitInlineJumpTable(unsigned JTIndex);
132 void emitMiscBranchInstruction(const MachineInstr &MI);
134 void emitVFPArithInstruction(const MachineInstr &MI);
136 void emitVFPConversionInstruction(const MachineInstr &MI);
138 void emitVFPLoadStoreInstruction(const MachineInstr &MI);
140 void emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI);
142 void emitNEONLaneInstruction(const MachineInstr &MI);
143 void emitNEONDupInstruction(const MachineInstr &MI);
144 void emitNEON1RegModImmInstruction(const MachineInstr &MI);
145 void emitNEON2RegInstruction(const MachineInstr &MI);
146 void emitNEON3RegInstruction(const MachineInstr &MI);
148 /// getMachineOpValue - Return binary encoding of operand. If the machine
149 /// operand requires relocation, record the relocation and return zero.
150 unsigned getMachineOpValue(const MachineInstr &MI,
151 const MachineOperand &MO) const;
152 unsigned getMachineOpValue(const MachineInstr &MI, unsigned OpIdx) const {
153 return getMachineOpValue(MI, MI.getOperand(OpIdx));
156 // FIXME: The legacy JIT ARMCodeEmitter doesn't rely on the the
157 // TableGen'erated getBinaryCodeForInstr() function to encode any
158 // operand values, instead querying getMachineOpValue() directly for
159 // each operand it needs to encode. Thus, any of the new encoder
160 // helper functions can simply return 0 as the values the return
161 // are already handled elsewhere. They are placeholders to allow this
162 // encoder to continue to function until the MC encoder is sufficiently
163 // far along that this one can be eliminated entirely.
164 unsigned NEONThumb2DataIPostEncoder(const MachineInstr &MI, unsigned Val)
166 unsigned NEONThumb2LoadStorePostEncoder(const MachineInstr &MI,unsigned Val)
168 unsigned NEONThumb2DupPostEncoder(const MachineInstr &MI,unsigned Val)
170 unsigned getBranchTargetOpValue(const MachineInstr &MI, unsigned Op)
172 unsigned getCCOutOpValue(const MachineInstr &MI, unsigned Op)
174 unsigned getSOImmOpValue(const MachineInstr &MI, unsigned Op)
176 unsigned getT2SOImmOpValue(const MachineInstr &MI, unsigned Op)
178 unsigned getSORegOpValue(const MachineInstr &MI, unsigned Op)
180 unsigned getT2SORegOpValue(const MachineInstr &MI, unsigned Op)
182 unsigned getRotImmOpValue(const MachineInstr &MI, unsigned Op)
184 unsigned getImmMinusOneOpValue(const MachineInstr &MI, unsigned Op)
186 unsigned getAddrMode6AddressOpValue(const MachineInstr &MI, unsigned Op)
188 unsigned getAddrMode6OffsetOpValue(const MachineInstr &MI, unsigned Op)
190 unsigned getBitfieldInvertedMaskOpValue(const MachineInstr &MI,
191 unsigned Op) const { return 0; }
192 uint32_t getLdStmModeOpValue(const MachineInstr &MI, unsigned OpIdx)
194 uint32_t getLdStSORegOpValue(const MachineInstr &MI, unsigned OpIdx)
197 unsigned getAddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
200 // {12} = (U)nsigned (add == '1', sub == '0')
202 const MachineOperand &MO = MI.getOperand(Op);
203 const MachineOperand &MO1 = MI.getOperand(Op + 1);
205 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
208 unsigned Reg = getARMRegisterNumbering(MO.getReg());
209 int32_t Imm12 = MO1.getImm();
211 Binary = Imm12 & 0xfff;
214 Binary |= (Reg << 13);
218 unsigned getMovtImmOpValue(const MachineInstr &MI, unsigned Op) const {
222 uint32_t getAddrMode2OpValue(const MachineInstr &MI, unsigned OpIdx)
224 uint32_t getAddrMode2OffsetOpValue(const MachineInstr &MI, unsigned OpIdx)
226 uint32_t getAddrMode3OffsetOpValue(const MachineInstr &MI, unsigned OpIdx)
228 uint32_t getAddrMode3OpValue(const MachineInstr &MI, unsigned Op) const
230 uint32_t getAddrMode5OpValue(const MachineInstr &MI, unsigned Op) const {
232 // {8} = (U)nsigned (add == '1', sub == '0')
234 const MachineOperand &MO = MI.getOperand(Op);
235 const MachineOperand &MO1 = MI.getOperand(Op + 1);
237 emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
240 unsigned Reg = getARMRegisterNumbering(MO.getReg());
241 int32_t Imm8 = MO1.getImm();
243 Binary = Imm8 & 0xff;
246 Binary |= (Reg << 9);
249 unsigned getNEONVcvtImm32OpValue(const MachineInstr &MI, unsigned Op)
252 unsigned getRegisterListOpValue(const MachineInstr &MI, unsigned Op)
255 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
256 /// machine operand requires relocation, record the relocation and return
258 unsigned getMovi32Value(const MachineInstr &MI,const MachineOperand &MO,
261 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
263 unsigned getShiftOp(unsigned Imm) const ;
265 /// Routines that handle operands which add machine relocations which are
266 /// fixed up by the relocation stage.
267 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
268 bool MayNeedFarStub, bool Indirect,
269 intptr_t ACPV = 0) const;
270 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
271 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
272 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
273 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
274 intptr_t JTBase = 0) const;
278 char ARMCodeEmitter::ID = 0;
280 /// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
281 /// code to the specified MCE object.
282 FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
283 JITCodeEmitter &JCE) {
284 return new ARMCodeEmitter(TM, JCE);
287 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
288 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
289 MF.getTarget().getRelocationModel() != Reloc::Static) &&
290 "JIT relocation model must be set to static or default!");
291 JTI = ((ARMTargetMachine &)MF.getTarget()).getJITInfo();
292 II = ((const ARMTargetMachine &)MF.getTarget()).getInstrInfo();
293 TD = ((const ARMTargetMachine &)MF.getTarget()).getTargetData();
294 Subtarget = &TM.getSubtarget<ARMSubtarget>();
295 MCPEs = &MF.getConstantPool()->getConstants();
297 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
298 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
299 IsThumb = MF.getInfo<ARMFunctionInfo>()->isThumbFunction();
300 JTI->Initialize(MF, IsPIC);
301 MMI = &getAnalysis<MachineModuleInfo>();
302 MCE.setModuleInfo(MMI);
305 DEBUG(errs() << "JITTing function '"
306 << MF.getFunction()->getName() << "'\n");
307 MCE.startFunction(MF);
308 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
310 MCE.StartMachineBasicBlock(MBB);
311 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
315 } while (MCE.finishFunction(MF));
320 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
322 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
323 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
324 default: llvm_unreachable("Unknown shift opc!");
325 case ARM_AM::asr: return 2;
326 case ARM_AM::lsl: return 0;
327 case ARM_AM::lsr: return 1;
329 case ARM_AM::rrx: return 3;
334 /// getMovi32Value - Return binary encoding of operand for movw/movt. If the
335 /// machine operand requires relocation, record the relocation and return zero.
336 unsigned ARMCodeEmitter::getMovi32Value(const MachineInstr &MI,
337 const MachineOperand &MO,
339 assert(((Reloc == ARM::reloc_arm_movt) || (Reloc == ARM::reloc_arm_movw))
340 && "Relocation to this function should be for movt or movw");
343 return static_cast<unsigned>(MO.getImm());
344 else if (MO.isGlobal())
345 emitGlobalAddress(MO.getGlobal(), Reloc, true, false);
346 else if (MO.isSymbol())
347 emitExternalSymbolAddress(MO.getSymbolName(), Reloc);
349 emitMachineBasicBlock(MO.getMBB(), Reloc);
354 llvm_unreachable("Unsupported operand type for movw/movt");
359 /// getMachineOpValue - Return binary encoding of operand. If the machine
360 /// operand requires relocation, record the relocation and return zero.
361 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
362 const MachineOperand &MO) const {
364 return getARMRegisterNumbering(MO.getReg());
366 return static_cast<unsigned>(MO.getImm());
367 else if (MO.isGlobal())
368 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
369 else if (MO.isSymbol())
370 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
371 else if (MO.isCPI()) {
372 const TargetInstrDesc &TID = MI.getDesc();
373 // For VFP load, the immediate offset is multiplied by 4.
374 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
375 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
376 emitConstPoolAddress(MO.getIndex(), Reloc);
377 } else if (MO.isJTI())
378 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
380 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
390 /// emitGlobalAddress - Emit the specified address to the code stream.
392 void ARMCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
393 bool MayNeedFarStub, bool Indirect,
394 intptr_t ACPV) const {
395 MachineRelocation MR = Indirect
396 ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
397 const_cast<GlobalValue *>(GV),
398 ACPV, MayNeedFarStub)
399 : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
400 const_cast<GlobalValue *>(GV), ACPV,
402 MCE.addRelocation(MR);
405 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
406 /// be emitted to the current location in the function, and allow it to be PC
408 void ARMCodeEmitter::
409 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
410 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
414 /// emitConstPoolAddress - Arrange for the address of an constant pool
415 /// to be emitted to the current location in the function, and allow it to be PC
417 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
418 // Tell JIT emitter we'll resolve the address.
419 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
420 Reloc, CPI, 0, true));
423 /// emitJumpTableAddress - Arrange for the address of a jump table to
424 /// be emitted to the current location in the function, and allow it to be PC
426 void ARMCodeEmitter::
427 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
428 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
429 Reloc, JTIndex, 0, true));
432 /// emitMachineBasicBlock - Emit the specified address basic block.
433 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
435 intptr_t JTBase) const {
436 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
440 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
441 DEBUG(errs() << " 0x";
442 errs().write_hex(Binary) << "\n");
443 MCE.emitWordLE(Binary);
446 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
447 DEBUG(errs() << " 0x";
448 errs().write_hex(Binary) << "\n");
449 MCE.emitDWordLE(Binary);
452 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
453 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
455 MCE.processDebugLoc(MI.getDebugLoc(), true);
457 ++NumEmitted; // Keep track of the # of mi's emitted
458 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
460 llvm_unreachable("Unhandled instruction encoding format!");
464 if (MI.getOpcode() == ARM::LEApcrelJT) {
465 // Materialize jumptable address.
466 emitLEApcrelJTInstruction(MI);
469 llvm_unreachable("Unhandled instruction encoding!");
472 emitPseudoInstruction(MI);
475 case ARMII::DPSoRegFrm:
476 emitDataProcessingInstruction(MI);
480 emitLoadStoreInstruction(MI);
482 case ARMII::LdMiscFrm:
483 case ARMII::StMiscFrm:
484 emitMiscLoadStoreInstruction(MI);
486 case ARMII::LdStMulFrm:
487 emitLoadStoreMultipleInstruction(MI);
490 emitMulFrmInstruction(MI);
493 emitExtendInstruction(MI);
495 case ARMII::ArithMiscFrm:
496 emitMiscArithInstruction(MI);
499 emitSaturateInstruction(MI);
502 emitBranchInstruction(MI);
504 case ARMII::BrMiscFrm:
505 emitMiscBranchInstruction(MI);
508 case ARMII::VFPUnaryFrm:
509 case ARMII::VFPBinaryFrm:
510 emitVFPArithInstruction(MI);
512 case ARMII::VFPConv1Frm:
513 case ARMII::VFPConv2Frm:
514 case ARMII::VFPConv3Frm:
515 case ARMII::VFPConv4Frm:
516 case ARMII::VFPConv5Frm:
517 emitVFPConversionInstruction(MI);
519 case ARMII::VFPLdStFrm:
520 emitVFPLoadStoreInstruction(MI);
522 case ARMII::VFPLdStMulFrm:
523 emitVFPLoadStoreMultipleInstruction(MI);
526 // NEON instructions.
527 case ARMII::NGetLnFrm:
528 case ARMII::NSetLnFrm:
529 emitNEONLaneInstruction(MI);
532 emitNEONDupInstruction(MI);
534 case ARMII::N1RegModImmFrm:
535 emitNEON1RegModImmInstruction(MI);
537 case ARMII::N2RegFrm:
538 emitNEON2RegInstruction(MI);
540 case ARMII::N3RegFrm:
541 emitNEON3RegInstruction(MI);
544 MCE.processDebugLoc(MI.getDebugLoc(), false);
547 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
548 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
549 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
550 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
552 // Remember the CONSTPOOL_ENTRY address for later relocation.
553 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
555 // Emit constpool island entry. In most cases, the actual values will be
556 // resolved and relocated after code emission.
557 if (MCPE.isMachineConstantPoolEntry()) {
558 ARMConstantPoolValue *ACPV =
559 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
561 DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
562 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
564 assert(ACPV->isGlobalValue() && "unsupported constant pool value");
565 const GlobalValue *GV = ACPV->getGV();
567 Reloc::Model RelocM = TM.getRelocationModel();
568 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
570 Subtarget->GVIsIndirectSymbol(GV, RelocM),
573 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
577 const Constant *CV = MCPE.Val.ConstVal;
580 errs() << " ** Constant pool #" << CPI << " @ "
581 << (void*)MCE.getCurrentPCValue() << " ";
582 if (const Function *F = dyn_cast<Function>(CV))
583 errs() << F->getName();
589 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
590 emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
592 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
593 uint32_t Val = uint32_t(*CI->getValue().getRawData());
595 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
596 if (CFP->getType()->isFloatTy())
597 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
598 else if (CFP->getType()->isDoubleTy())
599 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
601 llvm_unreachable("Unable to handle this constantpool entry!");
604 llvm_unreachable("Unable to handle this constantpool entry!");
609 void ARMCodeEmitter::emitMOVi32immInstruction(const MachineInstr &MI) {
610 const MachineOperand &MO0 = MI.getOperand(0);
611 const MachineOperand &MO1 = MI.getOperand(1);
613 // Emit the 'movw' instruction.
614 unsigned Binary = 0x30 << 20; // mov: Insts{27-20} = 0b00110000
616 unsigned Lo16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movw) & 0xFFFF;
618 // Set the conditional execution predicate.
619 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
622 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
624 // Encode imm16 as imm4:imm12
625 Binary |= Lo16 & 0xFFF; // Insts{11-0} = imm12
626 Binary |= ((Lo16 >> 12) & 0xF) << 16; // Insts{19-16} = imm4
629 unsigned Hi16 = getMovi32Value(MI, MO1, ARM::reloc_arm_movt) >> 16;
630 // Emit the 'movt' instruction.
631 Binary = 0x34 << 20; // movt: Insts{27-20} = 0b00110100
633 // Set the conditional execution predicate.
634 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
637 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
639 // Encode imm16 as imm4:imm1, same as movw above.
640 Binary |= Hi16 & 0xFFF;
641 Binary |= ((Hi16 >> 12) & 0xF) << 16;
645 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
646 const MachineOperand &MO0 = MI.getOperand(0);
647 const MachineOperand &MO1 = MI.getOperand(1);
648 assert(MO1.isImm() && ARM_AM::isSOImmTwoPartVal(MO1.getImm()) &&
649 "Not a valid so_imm value!");
650 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
651 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
653 // Emit the 'mov' instruction.
654 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
656 // Set the conditional execution predicate.
657 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
660 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
663 // Set bit I(25) to identify this is the immediate form of <shifter_op>
664 Binary |= 1 << ARMII::I_BitShift;
665 Binary |= getMachineSoImmOpValue(V1);
668 // Now the 'orr' instruction.
669 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
671 // Set the conditional execution predicate.
672 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
675 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
678 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
681 // Set bit I(25) to identify this is the immediate form of <shifter_op>
682 Binary |= 1 << ARMII::I_BitShift;
683 Binary |= getMachineSoImmOpValue(V2);
687 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
688 // It's basically add r, pc, (LJTI - $+8)
690 const TargetInstrDesc &TID = MI.getDesc();
692 // Emit the 'add' instruction.
693 unsigned Binary = 0x4 << 21; // add: Insts{24-21} = 0b0100
695 // Set the conditional execution predicate
696 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
698 // Encode S bit if MI modifies CPSR.
699 Binary |= getAddrModeSBit(MI, TID);
702 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
704 // Encode Rn which is PC.
705 Binary |= getARMRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
707 // Encode the displacement.
708 Binary |= 1 << ARMII::I_BitShift;
709 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
714 void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
715 unsigned Opcode = MI.getDesc().Opcode;
717 // Part of binary is determined by TableGn.
718 unsigned Binary = getBinaryCodeForInstr(MI);
720 // Set the conditional execution predicate
721 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
723 // Encode S bit if MI modifies CPSR.
724 if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
725 Binary |= 1 << ARMII::S_BitShift;
727 // Encode register def if there is one.
728 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
730 // Encode the shift operation.
737 case ARM::MOVsrl_flag:
739 Binary |= (0x2 << 4) | (1 << 7);
741 case ARM::MOVsra_flag:
743 Binary |= (0x4 << 4) | (1 << 7);
747 // Encode register Rm.
748 Binary |= getMachineOpValue(MI, 1);
753 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
754 DEBUG(errs() << " ** LPC" << LabelID << " @ "
755 << (void*)MCE.getCurrentPCValue() << '\n');
756 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
759 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
760 unsigned Opcode = MI.getDesc().Opcode;
763 llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
767 case ARM::BMOVPCRXr9: {
768 // First emit mov lr, pc
769 unsigned Binary = 0x01a0e00f;
770 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
773 // and then emit the branch.
774 emitMiscBranchInstruction(MI);
777 case TargetOpcode::INLINEASM: {
778 // We allow inline assembler nodes with empty bodies - they can
779 // implicitly define registers, which is ok for JIT.
780 if (MI.getOperand(0).getSymbolName()[0]) {
781 report_fatal_error("JIT does not support inline asm!");
785 case TargetOpcode::PROLOG_LABEL:
786 case TargetOpcode::EH_LABEL:
787 MCE.emitLabel(MI.getOperand(0).getMCSymbol());
789 case TargetOpcode::IMPLICIT_DEF:
790 case TargetOpcode::KILL:
793 case ARM::CONSTPOOL_ENTRY:
794 emitConstPoolInstruction(MI);
797 // Remember of the address of the PC label for relocation later.
798 addPCLabel(MI.getOperand(2).getImm());
799 // PICADD is just an add instruction that implicitly read pc.
800 emitDataProcessingInstruction(MI, 0, ARM::PC);
807 // Remember of the address of the PC label for relocation later.
808 addPCLabel(MI.getOperand(2).getImm());
809 // These are just load / store instructions that implicitly read pc.
810 emitLoadStoreInstruction(MI, 0, ARM::PC);
817 // Remember of the address of the PC label for relocation later.
818 addPCLabel(MI.getOperand(2).getImm());
819 // These are just load / store instructions that implicitly read pc.
820 emitMiscLoadStoreInstruction(MI, ARM::PC);
825 // Two instructions to materialize a constant.
826 if (Subtarget->hasV6T2Ops())
827 emitMOVi32immInstruction(MI);
829 emitMOVi2piecesInstruction(MI);
832 case ARM::LEApcrelJT:
833 // Materialize jumptable address.
834 emitLEApcrelJTInstruction(MI);
837 case ARM::MOVsrl_flag:
838 case ARM::MOVsra_flag:
839 emitPseudoMoveInstruction(MI);
844 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
845 const TargetInstrDesc &TID,
846 const MachineOperand &MO,
848 unsigned Binary = getMachineOpValue(MI, MO);
850 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
851 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
852 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
854 // Encode the shift opcode.
856 unsigned Rs = MO1.getReg();
858 // Set shift operand (bit[7:4]).
863 // RRX - 0110 and bit[11:8] clear.
865 default: llvm_unreachable("Unknown shift opc!");
866 case ARM_AM::lsl: SBits = 0x1; break;
867 case ARM_AM::lsr: SBits = 0x3; break;
868 case ARM_AM::asr: SBits = 0x5; break;
869 case ARM_AM::ror: SBits = 0x7; break;
870 case ARM_AM::rrx: SBits = 0x6; break;
873 // Set shift operand (bit[6:4]).
879 default: llvm_unreachable("Unknown shift opc!");
880 case ARM_AM::lsl: SBits = 0x0; break;
881 case ARM_AM::lsr: SBits = 0x2; break;
882 case ARM_AM::asr: SBits = 0x4; break;
883 case ARM_AM::ror: SBits = 0x6; break;
886 Binary |= SBits << 4;
887 if (SOpc == ARM_AM::rrx)
890 // Encode the shift operation Rs or shift_imm (except rrx).
892 // Encode Rs bit[11:8].
893 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
894 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
897 // Encode shift_imm bit[11:7].
898 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
901 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
902 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
903 assert(SoImmVal != -1 && "Not a valid so_imm value!");
905 // Encode rotate_imm.
906 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
907 << ARMII::SoRotImmShift;
910 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
914 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
915 const TargetInstrDesc &TID) const {
916 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
917 const MachineOperand &MO = MI.getOperand(i-1);
918 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
919 return 1 << ARMII::S_BitShift;
924 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
926 unsigned ImplicitRn) {
927 const TargetInstrDesc &TID = MI.getDesc();
929 // Part of binary is determined by TableGn.
930 unsigned Binary = getBinaryCodeForInstr(MI);
932 // Set the conditional execution predicate
933 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
935 // Encode S bit if MI modifies CPSR.
936 Binary |= getAddrModeSBit(MI, TID);
938 // Encode register def if there is one.
939 unsigned NumDefs = TID.getNumDefs();
942 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
944 // Special handling for implicit use (e.g. PC).
945 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
947 if (TID.Opcode == ARM::MOVi16) {
948 // Get immediate from MI.
949 unsigned Lo16 = getMovi32Value(MI, MI.getOperand(OpIdx),
950 ARM::reloc_arm_movw);
951 // Encode imm which is the same as in emitMOVi32immInstruction().
952 Binary |= Lo16 & 0xFFF;
953 Binary |= ((Lo16 >> 12) & 0xF) << 16;
956 } else if(TID.Opcode == ARM::MOVTi16) {
957 unsigned Hi16 = (getMovi32Value(MI, MI.getOperand(OpIdx),
958 ARM::reloc_arm_movt) >> 16);
959 Binary |= Hi16 & 0xFFF;
960 Binary |= ((Hi16 >> 12) & 0xF) << 16;
963 } else if ((TID.Opcode == ARM::BFC) || (TID.Opcode == ARM::BFI)) {
964 uint32_t v = ~MI.getOperand(2).getImm();
965 int32_t lsb = CountTrailingZeros_32(v);
966 int32_t msb = (32 - CountLeadingZeros_32(v)) - 1;
967 // Instr{20-16} = msb, Instr{11-7} = lsb
968 Binary |= (msb & 0x1F) << 16;
969 Binary |= (lsb & 0x1F) << 7;
972 } else if ((TID.Opcode == ARM::UBFX) || (TID.Opcode == ARM::SBFX)) {
973 // Encode Rn in Instr{0-3}
974 Binary |= getMachineOpValue(MI, OpIdx++);
976 uint32_t lsb = MI.getOperand(OpIdx++).getImm();
977 uint32_t widthm1 = MI.getOperand(OpIdx++).getImm() - 1;
979 // Instr{20-16} = widthm1, Instr{11-7} = lsb
980 Binary |= (widthm1 & 0x1F) << 16;
981 Binary |= (lsb & 0x1F) << 7;
986 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
987 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
990 // Encode first non-shifter register operand if there is one.
991 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
994 // Special handling for implicit use (e.g. PC).
995 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
997 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
1002 // Encode shifter operand.
1003 const MachineOperand &MO = MI.getOperand(OpIdx);
1004 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
1006 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
1011 // Encode register Rm.
1012 emitWordLE(Binary | getARMRegisterNumbering(MO.getReg()));
1017 Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
1022 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
1023 unsigned ImplicitRd,
1024 unsigned ImplicitRn) {
1025 const TargetInstrDesc &TID = MI.getDesc();
1026 unsigned Form = TID.TSFlags & ARMII::FormMask;
1027 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1029 // Part of binary is determined by TableGn.
1030 unsigned Binary = getBinaryCodeForInstr(MI);
1032 // If this is an LDRi12, STRi12 or LDRcp, nothing more needs be done.
1033 if (MI.getOpcode() == ARM::LDRi12 || MI.getOpcode() == ARM::LDRcp ||
1034 MI.getOpcode() == ARM::STRi12) {
1039 // Set the conditional execution predicate
1040 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1044 // Operand 0 of a pre- and post-indexed store is the address base
1045 // writeback. Skip it.
1046 bool Skipped = false;
1047 if (IsPrePost && Form == ARMII::StFrm) {
1052 // Set first operand
1054 // Special handling for implicit use (e.g. PC).
1055 Binary |= (getARMRegisterNumbering(ImplicitRd) << ARMII::RegRdShift);
1057 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1059 // Set second operand
1061 // Special handling for implicit use (e.g. PC).
1062 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1064 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1066 // If this is a two-address operand, skip it. e.g. LDR_PRE.
1067 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1070 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1071 unsigned AM2Opc = (ImplicitRn == ARM::PC)
1072 ? 0 : MI.getOperand(OpIdx+1).getImm();
1074 // Set bit U(23) according to sign of immed value (positive or negative).
1075 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
1077 if (!MO2.getReg()) { // is immediate
1078 if (ARM_AM::getAM2Offset(AM2Opc))
1079 // Set the value of offset_12 field
1080 Binary |= ARM_AM::getAM2Offset(AM2Opc);
1085 // Set bit I(25), because this is not in immediate encoding.
1086 Binary |= 1 << ARMII::I_BitShift;
1087 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
1088 // Set bit[3:0] to the corresponding Rm register
1089 Binary |= getARMRegisterNumbering(MO2.getReg());
1091 // If this instr is in scaled register offset/index instruction, set
1092 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
1093 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
1094 Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
1095 Binary |= ShImm << ARMII::ShiftShift; // shift_immed
1101 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
1102 unsigned ImplicitRn) {
1103 const TargetInstrDesc &TID = MI.getDesc();
1104 unsigned Form = TID.TSFlags & ARMII::FormMask;
1105 bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1107 // Part of binary is determined by TableGn.
1108 unsigned Binary = getBinaryCodeForInstr(MI);
1110 // Set the conditional execution predicate
1111 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1115 // Operand 0 of a pre- and post-indexed store is the address base
1116 // writeback. Skip it.
1117 bool Skipped = false;
1118 if (IsPrePost && Form == ARMII::StMiscFrm) {
1123 // Set first operand
1124 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1126 // Skip LDRD and STRD's second operand.
1127 if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
1130 // Set second operand
1132 // Special handling for implicit use (e.g. PC).
1133 Binary |= (getARMRegisterNumbering(ImplicitRn) << ARMII::RegRnShift);
1135 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1137 // If this is a two-address operand, skip it. e.g. LDRH_POST.
1138 if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1141 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1142 unsigned AM3Opc = (ImplicitRn == ARM::PC)
1143 ? 0 : MI.getOperand(OpIdx+1).getImm();
1145 // Set bit U(23) according to sign of immed value (positive or negative)
1146 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
1149 // If this instr is in register offset/index encoding, set bit[3:0]
1150 // to the corresponding Rm register.
1152 Binary |= getARMRegisterNumbering(MO2.getReg());
1157 // This instr is in immediate offset/index encoding, set bit 22 to 1.
1158 Binary |= 1 << ARMII::AM3_I_BitShift;
1159 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
1161 Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
1162 Binary |= (ImmOffs & 0xF); // immedL
1168 static unsigned getAddrModeUPBits(unsigned Mode) {
1169 unsigned Binary = 0;
1171 // Set addressing mode by modifying bits U(23) and P(24)
1172 // IA - Increment after - bit U = 1 and bit P = 0
1173 // IB - Increment before - bit U = 1 and bit P = 1
1174 // DA - Decrement after - bit U = 0 and bit P = 0
1175 // DB - Decrement before - bit U = 0 and bit P = 1
1177 default: llvm_unreachable("Unknown addressing sub-mode!");
1178 case ARM_AM::da: break;
1179 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
1180 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
1181 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
1187 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
1188 const TargetInstrDesc &TID = MI.getDesc();
1189 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1191 // Part of binary is determined by TableGn.
1192 unsigned Binary = getBinaryCodeForInstr(MI);
1194 // Set the conditional execution predicate
1195 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1197 // Skip operand 0 of an instruction with base register update.
1202 // Set base address operand
1203 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1205 // Set addressing mode by modifying bits U(23) and P(24)
1206 ARM_AM::AMSubMode Mode = ARM_AM::getLoadStoreMultipleSubMode(MI.getOpcode());
1207 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(Mode));
1211 Binary |= 0x1 << ARMII::W_BitShift;
1214 for (unsigned i = OpIdx+2, e = MI.getNumOperands(); i != e; ++i) {
1215 const MachineOperand &MO = MI.getOperand(i);
1216 if (!MO.isReg() || MO.isImplicit())
1218 unsigned RegNum = getARMRegisterNumbering(MO.getReg());
1219 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
1221 Binary |= 0x1 << RegNum;
1227 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
1228 const TargetInstrDesc &TID = MI.getDesc();
1230 // Part of binary is determined by TableGn.
1231 unsigned Binary = getBinaryCodeForInstr(MI);
1233 // Set the conditional execution predicate
1234 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1236 // Encode S bit if MI modifies CPSR.
1237 Binary |= getAddrModeSBit(MI, TID);
1239 // 32x32->64bit operations have two destination registers. The number
1240 // of register definitions will tell us if that's what we're dealing with.
1242 if (TID.getNumDefs() == 2)
1243 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
1246 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
1249 Binary |= getMachineOpValue(MI, OpIdx++);
1252 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
1254 // Many multiple instructions (e.g. MLA) have three src operands. Encode
1255 // it as Rn (for multiply, that's in the same offset as RdLo.
1256 if (TID.getNumOperands() > OpIdx &&
1257 !TID.OpInfo[OpIdx].isPredicate() &&
1258 !TID.OpInfo[OpIdx].isOptionalDef())
1259 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
1264 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
1265 const TargetInstrDesc &TID = MI.getDesc();
1267 // Part of binary is determined by TableGn.
1268 unsigned Binary = getBinaryCodeForInstr(MI);
1270 // Set the conditional execution predicate
1271 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1276 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1278 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1279 const MachineOperand &MO2 = MI.getOperand(OpIdx);
1281 // Two register operand form.
1283 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1286 Binary |= getMachineOpValue(MI, MO2);
1289 Binary |= getMachineOpValue(MI, MO1);
1292 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1293 if (MI.getOperand(OpIdx).isImm() &&
1294 !TID.OpInfo[OpIdx].isPredicate() &&
1295 !TID.OpInfo[OpIdx].isOptionalDef())
1296 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1301 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1302 const TargetInstrDesc &TID = MI.getDesc();
1304 // Part of binary is determined by TableGn.
1305 unsigned Binary = getBinaryCodeForInstr(MI);
1307 // Set the conditional execution predicate
1308 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1313 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1315 const MachineOperand &MO = MI.getOperand(OpIdx++);
1316 if (OpIdx == TID.getNumOperands() ||
1317 TID.OpInfo[OpIdx].isPredicate() ||
1318 TID.OpInfo[OpIdx].isOptionalDef()) {
1319 // Encode Rm and it's done.
1320 Binary |= getMachineOpValue(MI, MO);
1326 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1329 Binary |= getMachineOpValue(MI, OpIdx++);
1331 // Encode shift_imm.
1332 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1333 if (TID.Opcode == ARM::PKHTB) {
1334 assert(ShiftAmt != 0 && "PKHTB shift_imm is 0!");
1338 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1339 Binary |= ShiftAmt << ARMII::ShiftShift;
1344 void ARMCodeEmitter::emitSaturateInstruction(const MachineInstr &MI) {
1345 const TargetInstrDesc &TID = MI.getDesc();
1347 // Part of binary is determined by TableGen.
1348 unsigned Binary = getBinaryCodeForInstr(MI);
1350 // Set the conditional execution predicate
1351 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1354 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
1356 // Encode saturate bit position.
1357 unsigned Pos = MI.getOperand(1).getImm();
1358 if (TID.Opcode == ARM::SSAT || TID.Opcode == ARM::SSAT16)
1360 assert((Pos < 16 || (Pos < 32 &&
1361 TID.Opcode != ARM::SSAT16 &&
1362 TID.Opcode != ARM::USAT16)) &&
1363 "saturate bit position out of range");
1364 Binary |= Pos << 16;
1367 Binary |= getMachineOpValue(MI, 2);
1369 // Encode shift_imm.
1370 if (TID.getNumOperands() == 4) {
1371 unsigned ShiftOp = MI.getOperand(3).getImm();
1372 ARM_AM::ShiftOpc Opc = ARM_AM::getSORegShOp(ShiftOp);
1373 if (Opc == ARM_AM::asr)
1375 unsigned ShiftAmt = MI.getOperand(3).getImm();
1376 if (ShiftAmt == 32 && Opc == ARM_AM::asr)
1378 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1379 Binary |= ShiftAmt << ARMII::ShiftShift;
1385 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1386 const TargetInstrDesc &TID = MI.getDesc();
1388 if (TID.Opcode == ARM::TPsoft) {
1389 llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1392 // Part of binary is determined by TableGn.
1393 unsigned Binary = getBinaryCodeForInstr(MI);
1395 // Set the conditional execution predicate
1396 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1398 // Set signed_immed_24 field
1399 Binary |= getMachineOpValue(MI, 0);
1404 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1405 // Remember the base address of the inline jump table.
1406 uintptr_t JTBase = MCE.getCurrentPCValue();
1407 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1408 DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1411 // Now emit the jump table entries.
1412 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1413 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1415 // DestBB address - JT base.
1416 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1418 // Absolute DestBB address.
1419 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1424 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1425 const TargetInstrDesc &TID = MI.getDesc();
1427 // Handle jump tables.
1428 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1429 // First emit a ldr pc, [] instruction.
1430 emitDataProcessingInstruction(MI, ARM::PC);
1432 // Then emit the inline jump table.
1434 (TID.Opcode == ARM::BR_JTr)
1435 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1436 emitInlineJumpTable(JTIndex);
1438 } else if (TID.Opcode == ARM::BR_JTm) {
1439 // First emit a ldr pc, [] instruction.
1440 emitLoadStoreInstruction(MI, ARM::PC);
1442 // Then emit the inline jump table.
1443 emitInlineJumpTable(MI.getOperand(3).getIndex());
1447 // Part of binary is determined by TableGn.
1448 unsigned Binary = getBinaryCodeForInstr(MI);
1450 // Set the conditional execution predicate
1451 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1453 if (TID.Opcode == ARM::BX_RET || TID.Opcode == ARM::MOVPCLR)
1454 // The return register is LR.
1455 Binary |= getARMRegisterNumbering(ARM::LR);
1457 // otherwise, set the return register
1458 Binary |= getMachineOpValue(MI, 0);
1463 static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1464 unsigned RegD = MI.getOperand(OpIdx).getReg();
1465 unsigned Binary = 0;
1466 bool isSPVFP = ARM::SPRRegisterClass->contains(RegD);
1467 RegD = getARMRegisterNumbering(RegD);
1469 Binary |= RegD << ARMII::RegRdShift;
1471 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1472 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1477 static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1478 unsigned RegN = MI.getOperand(OpIdx).getReg();
1479 unsigned Binary = 0;
1480 bool isSPVFP = ARM::SPRRegisterClass->contains(RegN);
1481 RegN = getARMRegisterNumbering(RegN);
1483 Binary |= RegN << ARMII::RegRnShift;
1485 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1486 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1491 static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1492 unsigned RegM = MI.getOperand(OpIdx).getReg();
1493 unsigned Binary = 0;
1494 bool isSPVFP = ARM::SPRRegisterClass->contains(RegM);
1495 RegM = getARMRegisterNumbering(RegM);
1499 Binary |= ((RegM & 0x1E) >> 1);
1500 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1505 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1506 const TargetInstrDesc &TID = MI.getDesc();
1508 // Part of binary is determined by TableGn.
1509 unsigned Binary = getBinaryCodeForInstr(MI);
1511 // Set the conditional execution predicate
1512 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1515 assert((Binary & ARMII::D_BitShift) == 0 &&
1516 (Binary & ARMII::N_BitShift) == 0 &&
1517 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1520 Binary |= encodeVFPRd(MI, OpIdx++);
1522 // If this is a two-address operand, skip it, e.g. FMACD.
1523 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1527 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1528 Binary |= encodeVFPRn(MI, OpIdx++);
1530 if (OpIdx == TID.getNumOperands() ||
1531 TID.OpInfo[OpIdx].isPredicate() ||
1532 TID.OpInfo[OpIdx].isOptionalDef()) {
1533 // FCMPEZD etc. has only one operand.
1539 Binary |= encodeVFPRm(MI, OpIdx);
1544 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1545 const TargetInstrDesc &TID = MI.getDesc();
1546 unsigned Form = TID.TSFlags & ARMII::FormMask;
1548 // Part of binary is determined by TableGn.
1549 unsigned Binary = getBinaryCodeForInstr(MI);
1551 // Set the conditional execution predicate
1552 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1556 case ARMII::VFPConv1Frm:
1557 case ARMII::VFPConv2Frm:
1558 case ARMII::VFPConv3Frm:
1560 Binary |= encodeVFPRd(MI, 0);
1562 case ARMII::VFPConv4Frm:
1564 Binary |= encodeVFPRn(MI, 0);
1566 case ARMII::VFPConv5Frm:
1568 Binary |= encodeVFPRm(MI, 0);
1574 case ARMII::VFPConv1Frm:
1576 Binary |= encodeVFPRm(MI, 1);
1578 case ARMII::VFPConv2Frm:
1579 case ARMII::VFPConv3Frm:
1581 Binary |= encodeVFPRn(MI, 1);
1583 case ARMII::VFPConv4Frm:
1584 case ARMII::VFPConv5Frm:
1586 Binary |= encodeVFPRd(MI, 1);
1590 if (Form == ARMII::VFPConv5Frm)
1592 Binary |= encodeVFPRn(MI, 2);
1593 else if (Form == ARMII::VFPConv3Frm)
1595 Binary |= encodeVFPRm(MI, 2);
1600 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1601 // Part of binary is determined by TableGn.
1602 unsigned Binary = getBinaryCodeForInstr(MI);
1604 // Set the conditional execution predicate
1605 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1610 Binary |= encodeVFPRd(MI, OpIdx++);
1612 // Encode address base.
1613 const MachineOperand &Base = MI.getOperand(OpIdx++);
1614 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1616 // If there is a non-zero immediate offset, encode it.
1618 const MachineOperand &Offset = MI.getOperand(OpIdx);
1619 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1620 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1621 Binary |= 1 << ARMII::U_BitShift;
1628 // If immediate offset is omitted, default to +0.
1629 Binary |= 1 << ARMII::U_BitShift;
1635 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1636 const TargetInstrDesc &TID = MI.getDesc();
1637 bool IsUpdating = (TID.TSFlags & ARMII::IndexModeMask) != 0;
1639 // Part of binary is determined by TableGn.
1640 unsigned Binary = getBinaryCodeForInstr(MI);
1642 // Set the conditional execution predicate
1643 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1645 // Skip operand 0 of an instruction with base register update.
1650 // Set base address operand
1651 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
1653 // Set addressing mode by modifying bits U(23) and P(24)
1654 ARM_AM::AMSubMode Mode = ARM_AM::getLoadStoreMultipleSubMode(MI.getOpcode());
1655 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(Mode));
1659 Binary |= 0x1 << ARMII::W_BitShift;
1661 // First register is encoded in Dd.
1662 Binary |= encodeVFPRd(MI, OpIdx+2);
1664 // Count the number of registers.
1665 unsigned NumRegs = 1;
1666 for (unsigned i = OpIdx+3, e = MI.getNumOperands(); i != e; ++i) {
1667 const MachineOperand &MO = MI.getOperand(i);
1668 if (!MO.isReg() || MO.isImplicit())
1672 // Bit 8 will be set if <list> is consecutive 64-bit registers (e.g., D0)
1673 // Otherwise, it will be 0, in the case of 32-bit registers.
1675 Binary |= NumRegs * 2;
1682 static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
1683 unsigned RegD = MI.getOperand(OpIdx).getReg();
1684 unsigned Binary = 0;
1685 RegD = getARMRegisterNumbering(RegD);
1686 Binary |= (RegD & 0xf) << ARMII::RegRdShift;
1687 Binary |= ((RegD >> 4) & 1) << ARMII::D_BitShift;
1691 static unsigned encodeNEONRn(const MachineInstr &MI, unsigned OpIdx) {
1692 unsigned RegN = MI.getOperand(OpIdx).getReg();
1693 unsigned Binary = 0;
1694 RegN = getARMRegisterNumbering(RegN);
1695 Binary |= (RegN & 0xf) << ARMII::RegRnShift;
1696 Binary |= ((RegN >> 4) & 1) << ARMII::N_BitShift;
1700 static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
1701 unsigned RegM = MI.getOperand(OpIdx).getReg();
1702 unsigned Binary = 0;
1703 RegM = getARMRegisterNumbering(RegM);
1704 Binary |= (RegM & 0xf);
1705 Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
1709 /// convertNEONDataProcToThumb - Convert the ARM mode encoding for a NEON
1710 /// data-processing instruction to the corresponding Thumb encoding.
1711 static unsigned convertNEONDataProcToThumb(unsigned Binary) {
1712 assert((Binary & 0xfe000000) == 0xf2000000 &&
1713 "not an ARM NEON data-processing instruction");
1714 unsigned UBit = (Binary >> 24) & 1;
1715 return 0xef000000 | (UBit << 28) | (Binary & 0xffffff);
1718 void ARMCodeEmitter::emitNEONLaneInstruction(const MachineInstr &MI) {
1719 unsigned Binary = getBinaryCodeForInstr(MI);
1721 unsigned RegTOpIdx, RegNOpIdx, LnOpIdx;
1722 const TargetInstrDesc &TID = MI.getDesc();
1723 if ((TID.TSFlags & ARMII::FormMask) == ARMII::NGetLnFrm) {
1727 } else { // ARMII::NSetLnFrm
1733 // Set the conditional execution predicate
1734 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1736 unsigned RegT = MI.getOperand(RegTOpIdx).getReg();
1737 RegT = getARMRegisterNumbering(RegT);
1738 Binary |= (RegT << ARMII::RegRdShift);
1739 Binary |= encodeNEONRn(MI, RegNOpIdx);
1742 if ((Binary & (1 << 22)) != 0)
1743 LaneShift = 0; // 8-bit elements
1744 else if ((Binary & (1 << 5)) != 0)
1745 LaneShift = 1; // 16-bit elements
1747 LaneShift = 2; // 32-bit elements
1749 unsigned Lane = MI.getOperand(LnOpIdx).getImm() << LaneShift;
1750 unsigned Opc1 = Lane >> 2;
1751 unsigned Opc2 = Lane & 3;
1752 assert((Opc1 & 3) == 0 && "out-of-range lane number operand");
1753 Binary |= (Opc1 << 21);
1754 Binary |= (Opc2 << 5);
1759 void ARMCodeEmitter::emitNEONDupInstruction(const MachineInstr &MI) {
1760 unsigned Binary = getBinaryCodeForInstr(MI);
1762 // Set the conditional execution predicate
1763 Binary |= (IsThumb ? ARMCC::AL : II->getPredicate(&MI)) << ARMII::CondShift;
1765 unsigned RegT = MI.getOperand(1).getReg();
1766 RegT = getARMRegisterNumbering(RegT);
1767 Binary |= (RegT << ARMII::RegRdShift);
1768 Binary |= encodeNEONRn(MI, 0);
1772 void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
1773 unsigned Binary = getBinaryCodeForInstr(MI);
1774 // Destination register is encoded in Dd.
1775 Binary |= encodeNEONRd(MI, 0);
1776 // Immediate fields: Op, Cmode, I, Imm3, Imm4
1777 unsigned Imm = MI.getOperand(1).getImm();
1778 unsigned Op = (Imm >> 12) & 1;
1779 unsigned Cmode = (Imm >> 8) & 0xf;
1780 unsigned I = (Imm >> 7) & 1;
1781 unsigned Imm3 = (Imm >> 4) & 0x7;
1782 unsigned Imm4 = Imm & 0xf;
1783 Binary |= (I << 24) | (Imm3 << 16) | (Cmode << 8) | (Op << 5) | Imm4;
1785 Binary = convertNEONDataProcToThumb(Binary);
1789 void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
1790 const TargetInstrDesc &TID = MI.getDesc();
1791 unsigned Binary = getBinaryCodeForInstr(MI);
1792 // Destination register is encoded in Dd; source register in Dm.
1794 Binary |= encodeNEONRd(MI, OpIdx++);
1795 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1797 Binary |= encodeNEONRm(MI, OpIdx);
1799 Binary = convertNEONDataProcToThumb(Binary);
1800 // FIXME: This does not handle VDUPfdf or VDUPfqf.
1804 void ARMCodeEmitter::emitNEON3RegInstruction(const MachineInstr &MI) {
1805 const TargetInstrDesc &TID = MI.getDesc();
1806 unsigned Binary = getBinaryCodeForInstr(MI);
1807 // Destination register is encoded in Dd; source registers in Dn and Dm.
1809 Binary |= encodeNEONRd(MI, OpIdx++);
1810 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1812 Binary |= encodeNEONRn(MI, OpIdx++);
1813 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1815 Binary |= encodeNEONRm(MI, OpIdx);
1817 Binary = convertNEONDataProcToThumb(Binary);
1818 // FIXME: This does not handle VMOVDneon or VMOVQ.
1822 #include "ARMGenCodeEmitter.inc"