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/MachineCodeEmitter.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/Passes.h"
33 #include "llvm/ADT/Statistic.h"
34 #include "llvm/Support/Compiler.h"
35 #include "llvm/Support/Debug.h"
41 STATISTIC(NumEmitted, "Number of machine instructions emitted");
44 class VISIBILITY_HIDDEN ARMCodeEmitter : public MachineFunctionPass {
46 const ARMInstrInfo *II;
49 MachineCodeEmitter &MCE;
50 const std::vector<MachineConstantPoolEntry> *MCPEs;
51 const std::vector<MachineJumpTableEntry> *MJTEs;
56 explicit ARMCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce)
57 : MachineFunctionPass(&ID), JTI(0), II(0), TD(0), TM(tm),
58 MCE(mce), MCPEs(0), MJTEs(0),
59 IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
60 ARMCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce,
61 const ARMInstrInfo &ii, const TargetData &td)
62 : MachineFunctionPass(&ID), JTI(0), II(&ii), TD(&td), TM(tm),
63 MCE(mce), MCPEs(0), MJTEs(0),
64 IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
66 bool runOnMachineFunction(MachineFunction &MF);
68 virtual const char *getPassName() const {
69 return "ARM Machine Code Emitter";
72 void emitInstruction(const MachineInstr &MI);
76 void emitWordLE(unsigned Binary);
78 void emitDWordLE(uint64_t Binary);
80 void emitConstPoolInstruction(const MachineInstr &MI);
82 void emitMOVi2piecesInstruction(const MachineInstr &MI);
84 void emitLEApcrelJTInstruction(const MachineInstr &MI);
86 void addPCLabel(unsigned LabelID);
88 void emitPseudoInstruction(const MachineInstr &MI);
90 unsigned getMachineSoRegOpValue(const MachineInstr &MI,
91 const TargetInstrDesc &TID,
92 const MachineOperand &MO,
95 unsigned getMachineSoImmOpValue(unsigned SoImm);
97 unsigned getAddrModeSBit(const MachineInstr &MI,
98 const TargetInstrDesc &TID) const;
100 void emitDataProcessingInstruction(const MachineInstr &MI,
101 unsigned ImplicitRd = 0,
102 unsigned ImplicitRn = 0);
104 void emitLoadStoreInstruction(const MachineInstr &MI,
105 unsigned ImplicitRd = 0,
106 unsigned ImplicitRn = 0);
108 void emitMiscLoadStoreInstruction(const MachineInstr &MI,
109 unsigned ImplicitRn = 0);
111 void emitLoadStoreMultipleInstruction(const MachineInstr &MI);
113 void emitMulFrmInstruction(const MachineInstr &MI);
115 void emitExtendInstruction(const MachineInstr &MI);
117 void emitMiscArithInstruction(const MachineInstr &MI);
119 void emitBranchInstruction(const MachineInstr &MI);
121 void emitInlineJumpTable(unsigned JTIndex);
123 void emitMiscBranchInstruction(const MachineInstr &MI);
125 void emitVFPArithInstruction(const MachineInstr &MI);
127 void emitVFPConversionInstruction(const MachineInstr &MI);
129 void emitVFPLoadStoreInstruction(const MachineInstr &MI);
131 void emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI);
133 void emitMiscInstruction(const MachineInstr &MI);
135 /// getBinaryCodeForInstr - This function, generated by the
136 /// CodeEmitterGenerator using TableGen, produces the binary encoding for
137 /// machine instructions.
139 unsigned getBinaryCodeForInstr(const MachineInstr &MI);
141 /// getMachineOpValue - Return binary encoding of operand. If the machine
142 /// operand requires relocation, record the relocation and return zero.
143 unsigned getMachineOpValue(const MachineInstr &MI,const MachineOperand &MO);
144 unsigned getMachineOpValue(const MachineInstr &MI, unsigned OpIdx) {
145 return getMachineOpValue(MI, MI.getOperand(OpIdx));
148 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
150 unsigned getShiftOp(unsigned Imm) const ;
152 /// Routines that handle operands which add machine relocations which are
153 /// fixed up by the relocation stage.
154 void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
155 bool NeedStub, intptr_t ACPV = 0);
156 void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
157 void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
158 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc);
159 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
160 intptr_t JTBase = 0);
162 char ARMCodeEmitter::ID = 0;
165 /// createARMCodeEmitterPass - Return a pass that emits the collected ARM code
166 /// to the specified MCE object.
167 FunctionPass *llvm::createARMCodeEmitterPass(ARMTargetMachine &TM,
168 MachineCodeEmitter &MCE) {
169 return new ARMCodeEmitter(TM, MCE);
172 bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
173 assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
174 MF.getTarget().getRelocationModel() != Reloc::Static) &&
175 "JIT relocation model must be set to static or default!");
176 II = ((ARMTargetMachine&)MF.getTarget()).getInstrInfo();
177 TD = ((ARMTargetMachine&)MF.getTarget()).getTargetData();
178 JTI = ((ARMTargetMachine&)MF.getTarget()).getJITInfo();
179 MCPEs = &MF.getConstantPool()->getConstants();
180 MJTEs = &MF.getJumpTableInfo()->getJumpTables();
181 IsPIC = TM.getRelocationModel() == Reloc::PIC_;
182 JTI->Initialize(MF, IsPIC);
185 DOUT << "JITTing function '" << MF.getFunction()->getName() << "'\n";
186 MCE.startFunction(MF);
187 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
189 MCE.StartMachineBasicBlock(MBB);
190 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
194 } while (MCE.finishFunction(MF));
199 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
201 unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
202 switch (ARM_AM::getAM2ShiftOpc(Imm)) {
203 default: assert(0 && "Unknown shift opc!");
204 case ARM_AM::asr: return 2;
205 case ARM_AM::lsl: return 0;
206 case ARM_AM::lsr: return 1;
208 case ARM_AM::rrx: return 3;
213 /// getMachineOpValue - Return binary encoding of operand. If the machine
214 /// operand requires relocation, record the relocation and return zero.
215 unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
216 const MachineOperand &MO) {
218 return ARMRegisterInfo::getRegisterNumbering(MO.getReg());
220 return static_cast<unsigned>(MO.getImm());
221 else if (MO.isGlobal())
222 emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true);
223 else if (MO.isSymbol())
224 emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
225 else if (MO.isCPI()) {
226 const TargetInstrDesc &TID = MI.getDesc();
227 // For VFP load, the immediate offset is multiplied by 4.
228 unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
229 ? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
230 emitConstPoolAddress(MO.getIndex(), Reloc);
231 } else if (MO.isJTI())
232 emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
234 emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
236 cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
242 /// emitGlobalAddress - Emit the specified address to the code stream.
244 void ARMCodeEmitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
245 bool NeedStub, intptr_t ACPV) {
246 MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
247 Reloc, GV, ACPV, NeedStub));
250 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
251 /// be emitted to the current location in the function, and allow it to be PC
253 void ARMCodeEmitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
254 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
258 /// emitConstPoolAddress - Arrange for the address of an constant pool
259 /// to be emitted to the current location in the function, and allow it to be PC
261 void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
262 // Tell JIT emitter we'll resolve the address.
263 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
264 Reloc, CPI, 0, true));
267 /// emitJumpTableAddress - Arrange for the address of a jump table to
268 /// be emitted to the current location in the function, and allow it to be PC
270 void ARMCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) {
271 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
272 Reloc, JTIndex, 0, true));
275 /// emitMachineBasicBlock - Emit the specified address basic block.
276 void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
277 unsigned Reloc, intptr_t JTBase) {
278 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
282 void ARMCodeEmitter::emitWordLE(unsigned Binary) {
284 DOUT << " 0x" << std::hex << std::setw(8) << std::setfill('0')
285 << Binary << std::dec << "\n";
287 MCE.emitWordLE(Binary);
290 void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
292 DOUT << " 0x" << std::hex << std::setw(8) << std::setfill('0')
293 << (unsigned)Binary << std::dec << "\n";
294 DOUT << " 0x" << std::hex << std::setw(8) << std::setfill('0')
295 << (unsigned)(Binary >> 32) << std::dec << "\n";
297 MCE.emitDWordLE(Binary);
300 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
301 DOUT << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI;
303 NumEmitted++; // Keep track of the # of mi's emitted
304 switch (MI.getDesc().TSFlags & ARMII::FormMask) {
306 assert(0 && "Unhandled instruction encoding format!");
309 emitPseudoInstruction(MI);
312 case ARMII::DPSoRegFrm:
313 emitDataProcessingInstruction(MI);
317 emitLoadStoreInstruction(MI);
319 case ARMII::LdMiscFrm:
320 case ARMII::StMiscFrm:
321 emitMiscLoadStoreInstruction(MI);
323 case ARMII::LdMulFrm:
324 case ARMII::StMulFrm:
325 emitLoadStoreMultipleInstruction(MI);
328 emitMulFrmInstruction(MI);
331 emitExtendInstruction(MI);
333 case ARMII::ArithMiscFrm:
334 emitMiscArithInstruction(MI);
337 emitBranchInstruction(MI);
339 case ARMII::BrMiscFrm:
340 emitMiscBranchInstruction(MI);
343 case ARMII::VFPUnaryFrm:
344 case ARMII::VFPBinaryFrm:
345 emitVFPArithInstruction(MI);
347 case ARMII::VFPConv1Frm:
348 case ARMII::VFPConv2Frm:
349 case ARMII::VFPConv3Frm:
350 emitVFPConversionInstruction(MI);
352 case ARMII::VFPLdStFrm:
353 emitVFPLoadStoreInstruction(MI);
355 case ARMII::VFPLdStMulFrm:
356 emitVFPLoadStoreMultipleInstruction(MI);
358 case ARMII::VFPMiscFrm:
359 emitMiscInstruction(MI);
364 void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
365 unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
366 unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
367 const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
369 // Remember the CONSTPOOL_ENTRY address for later relocation.
370 JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
372 // Emit constpool island entry. In most cases, the actual values will be
373 // resolved and relocated after code emission.
374 if (MCPE.isMachineConstantPoolEntry()) {
375 ARMConstantPoolValue *ACPV =
376 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
378 DOUT << " ** ARM constant pool #" << CPI << " @ "
379 << (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n';
381 GlobalValue *GV = ACPV->getGV();
383 assert(!ACPV->isStub() && "Don't know how to deal this yet!");
384 if (ACPV->isNonLazyPointer())
385 MCE.addRelocation(MachineRelocation::getIndirectSymbol(
386 MCE.getCurrentPCOffset(), ARM::reloc_arm_machine_cp_entry, GV,
387 (intptr_t)ACPV, false));
389 emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
390 ACPV->isStub(), (intptr_t)ACPV);
392 assert(!ACPV->isNonLazyPointer() && "Don't know how to deal this yet!");
393 emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
397 Constant *CV = MCPE.Val.ConstVal;
399 DOUT << " ** Constant pool #" << CPI << " @ "
400 << (void*)MCE.getCurrentPCValue() << " " << *CV << '\n';
402 if (GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
403 emitGlobalAddress(GV, ARM::reloc_arm_absolute, false);
405 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
406 uint32_t Val = *(uint32_t*)CI->getValue().getRawData();
408 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
409 if (CFP->getType() == Type::FloatTy)
410 emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
411 else if (CFP->getType() == Type::DoubleTy)
412 emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
414 assert(0 && "Unable to handle this constantpool entry!");
418 assert(0 && "Unable to handle this constantpool entry!");
424 void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
425 const MachineOperand &MO0 = MI.getOperand(0);
426 const MachineOperand &MO1 = MI.getOperand(1);
427 assert(MO1.isImm() && "Not a valid so_imm value!");
428 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
429 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
431 // Emit the 'mov' instruction.
432 unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
434 // Set the conditional execution predicate.
435 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
438 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
441 // Set bit I(25) to identify this is the immediate form of <shifter_op>
442 Binary |= 1 << ARMII::I_BitShift;
443 Binary |= getMachineSoImmOpValue(ARM_AM::getSOImmVal(V1));
446 // Now the 'orr' instruction.
447 Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
449 // Set the conditional execution predicate.
450 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
453 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
456 Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
459 // Set bit I(25) to identify this is the immediate form of <shifter_op>
460 Binary |= 1 << ARMII::I_BitShift;
461 Binary |= getMachineSoImmOpValue(ARM_AM::getSOImmVal(V2));
465 void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
466 // It's basically add r, pc, (LJTI - $+8)
468 const TargetInstrDesc &TID = MI.getDesc();
470 // Emit the 'add' instruction.
471 unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
473 // Set the conditional execution predicate
474 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
476 // Encode S bit if MI modifies CPSR.
477 Binary |= getAddrModeSBit(MI, TID);
480 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
482 // Encode Rn which is PC.
483 Binary |= ARMRegisterInfo::getRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
485 // Encode the displacement.
486 // Set bit I(25) to identify this is the immediate form of <shifter_op>.
487 Binary |= 1 << ARMII::I_BitShift;
488 emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
493 void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
494 DOUT << " ** LPC" << LabelID << " @ "
495 << (void*)MCE.getCurrentPCValue() << '\n';
496 JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
499 void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
500 unsigned Opcode = MI.getDesc().Opcode;
504 case ARM::CONSTPOOL_ENTRY:
505 emitConstPoolInstruction(MI);
508 // Remember of the address of the PC label for relocation later.
509 addPCLabel(MI.getOperand(2).getImm());
510 // PICADD is just an add instruction that implicitly read pc.
511 emitDataProcessingInstruction(MI, 0, ARM::PC);
518 // Remember of the address of the PC label for relocation later.
519 addPCLabel(MI.getOperand(2).getImm());
520 // These are just load / store instructions that implicitly read pc.
521 emitLoadStoreInstruction(MI, 0, ARM::PC);
528 // Remember of the address of the PC label for relocation later.
529 addPCLabel(MI.getOperand(2).getImm());
530 // These are just load / store instructions that implicitly read pc.
531 emitMiscLoadStoreInstruction(MI, ARM::PC);
534 case ARM::MOVi2pieces:
535 // Two instructions to materialize a constant.
536 emitMOVi2piecesInstruction(MI);
538 case ARM::LEApcrelJT:
539 // Materialize jumptable address.
540 emitLEApcrelJTInstruction(MI);
546 unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
547 const TargetInstrDesc &TID,
548 const MachineOperand &MO,
550 unsigned Binary = getMachineOpValue(MI, MO);
552 const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
553 const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
554 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
556 // Encode the shift opcode.
558 unsigned Rs = MO1.getReg();
560 // Set shift operand (bit[7:4]).
565 // RRX - 0110 and bit[11:8] clear.
567 default: assert(0 && "Unknown shift opc!");
568 case ARM_AM::lsl: SBits = 0x1; break;
569 case ARM_AM::lsr: SBits = 0x3; break;
570 case ARM_AM::asr: SBits = 0x5; break;
571 case ARM_AM::ror: SBits = 0x7; break;
572 case ARM_AM::rrx: SBits = 0x6; break;
575 // Set shift operand (bit[6:4]).
581 default: assert(0 && "Unknown shift opc!");
582 case ARM_AM::lsl: SBits = 0x0; break;
583 case ARM_AM::lsr: SBits = 0x2; break;
584 case ARM_AM::asr: SBits = 0x4; break;
585 case ARM_AM::ror: SBits = 0x6; break;
588 Binary |= SBits << 4;
589 if (SOpc == ARM_AM::rrx)
592 // Encode the shift operation Rs or shift_imm (except rrx).
594 // Encode Rs bit[11:8].
595 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
597 (ARMRegisterInfo::getRegisterNumbering(Rs) << ARMII::RegRsShift);
600 // Encode shift_imm bit[11:7].
601 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
604 unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
605 // Encode rotate_imm.
606 unsigned Binary = (ARM_AM::getSOImmValRot(SoImm) >> 1)
607 << ARMII::SoRotImmShift;
610 Binary |= ARM_AM::getSOImmValImm(SoImm);
614 unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
615 const TargetInstrDesc &TID) const {
616 for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
617 const MachineOperand &MO = MI.getOperand(i-1);
618 if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
619 return 1 << ARMII::S_BitShift;
624 void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
626 unsigned ImplicitRn) {
627 const TargetInstrDesc &TID = MI.getDesc();
629 // Part of binary is determined by TableGn.
630 unsigned Binary = getBinaryCodeForInstr(MI);
632 // Set the conditional execution predicate
633 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
635 // Encode S bit if MI modifies CPSR.
636 Binary |= getAddrModeSBit(MI, TID);
638 // Encode register def if there is one.
639 unsigned NumDefs = TID.getNumDefs();
642 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
644 // Special handling for implicit use (e.g. PC).
645 Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
646 << ARMII::RegRdShift);
648 // If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
649 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
652 // Encode first non-shifter register operand if there is one.
653 bool isUnary = TID.TSFlags & ARMII::UnaryDP;
656 // Special handling for implicit use (e.g. PC).
657 Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
658 << ARMII::RegRnShift);
660 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
665 // Encode shifter operand.
666 const MachineOperand &MO = MI.getOperand(OpIdx);
667 if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
669 emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
674 // Encode register Rm.
675 emitWordLE(Binary | ARMRegisterInfo::getRegisterNumbering(MO.getReg()));
680 // Set bit I(25) to identify this is the immediate form of <shifter_op>.
681 Binary |= 1 << ARMII::I_BitShift;
682 Binary |= getMachineSoImmOpValue(MO.getImm());
687 void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
689 unsigned ImplicitRn) {
690 const TargetInstrDesc &TID = MI.getDesc();
692 // Part of binary is determined by TableGn.
693 unsigned Binary = getBinaryCodeForInstr(MI);
695 // Set the conditional execution predicate
696 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
701 // Special handling for implicit use (e.g. PC).
702 Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
703 << ARMII::RegRdShift);
705 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
707 // Set second operand
709 // Special handling for implicit use (e.g. PC).
710 Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
711 << ARMII::RegRnShift);
713 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
715 // If this is a two-address operand, skip it. e.g. LDR_PRE.
716 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
719 const MachineOperand &MO2 = MI.getOperand(OpIdx);
720 unsigned AM2Opc = (ImplicitRn == ARM::PC)
721 ? 0 : MI.getOperand(OpIdx+1).getImm();
723 // Set bit U(23) according to sign of immed value (positive or negative).
724 Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
726 if (!MO2.getReg()) { // is immediate
727 if (ARM_AM::getAM2Offset(AM2Opc))
728 // Set the value of offset_12 field
729 Binary |= ARM_AM::getAM2Offset(AM2Opc);
734 // Set bit I(25), because this is not in immediate enconding.
735 Binary |= 1 << ARMII::I_BitShift;
736 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
737 // Set bit[3:0] to the corresponding Rm register
738 Binary |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
740 // if this instr is in scaled register offset/index instruction, set
741 // shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
742 if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
743 Binary |= getShiftOp(AM2Opc) << 5; // shift
744 Binary |= ShImm << 7; // shift_immed
750 void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
751 unsigned ImplicitRn) {
752 const TargetInstrDesc &TID = MI.getDesc();
754 // Part of binary is determined by TableGn.
755 unsigned Binary = getBinaryCodeForInstr(MI);
757 // Set the conditional execution predicate
758 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
761 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
763 // Set second operand
766 // Special handling for implicit use (e.g. PC).
767 Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
768 << ARMII::RegRnShift);
770 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
772 // If this is a two-address operand, skip it. e.g. LDRH_POST.
773 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
776 const MachineOperand &MO2 = MI.getOperand(OpIdx);
777 unsigned AM3Opc = (ImplicitRn == ARM::PC)
778 ? 0 : MI.getOperand(OpIdx+1).getImm();
780 // Set bit U(23) according to sign of immed value (positive or negative)
781 Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
784 // If this instr is in register offset/index encoding, set bit[3:0]
785 // to the corresponding Rm register.
787 Binary |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
792 // This instr is in immediate offset/index encoding, set bit 22 to 1.
793 Binary |= 1 << ARMII::AM3_I_BitShift;
794 if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
796 Binary |= (ImmOffs >> 4) << 8; // immedH
797 Binary |= (ImmOffs & ~0xF); // immedL
803 static unsigned getAddrModeUPBits(unsigned Mode) {
806 // Set addressing mode by modifying bits U(23) and P(24)
807 // IA - Increment after - bit U = 1 and bit P = 0
808 // IB - Increment before - bit U = 1 and bit P = 1
809 // DA - Decrement after - bit U = 0 and bit P = 0
810 // DB - Decrement before - bit U = 0 and bit P = 1
812 default: assert(0 && "Unknown addressing sub-mode!");
813 case ARM_AM::da: break;
814 case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
815 case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
816 case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
822 void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
823 // Part of binary is determined by TableGn.
824 unsigned Binary = getBinaryCodeForInstr(MI);
826 // Set the conditional execution predicate
827 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
829 // Set base address operand
830 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRnShift;
832 // Set addressing mode by modifying bits U(23) and P(24)
833 const MachineOperand &MO = MI.getOperand(1);
834 Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
837 if (ARM_AM::getAM4WBFlag(MO.getImm()))
838 Binary |= 0x1 << ARMII::W_BitShift;
841 for (unsigned i = 4, e = MI.getNumOperands(); i != e; ++i) {
842 const MachineOperand &MO = MI.getOperand(i);
843 if (!MO.isReg() || MO.isImplicit())
845 unsigned RegNum = ARMRegisterInfo::getRegisterNumbering(MO.getReg());
846 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
848 Binary |= 0x1 << RegNum;
854 void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
855 const TargetInstrDesc &TID = MI.getDesc();
857 // Part of binary is determined by TableGn.
858 unsigned Binary = getBinaryCodeForInstr(MI);
860 // Set the conditional execution predicate
861 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
863 // Encode S bit if MI modifies CPSR.
864 Binary |= getAddrModeSBit(MI, TID);
866 // 32x32->64bit operations have two destination registers. The number
867 // of register definitions will tell us if that's what we're dealing with.
869 if (TID.getNumDefs() == 2)
870 Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
873 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
876 Binary |= getMachineOpValue(MI, OpIdx++);
879 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
881 // Many multiple instructions (e.g. MLA) have three src operands. Encode
882 // it as Rn (for multiply, that's in the same offset as RdLo.
883 if (TID.getNumOperands() > OpIdx &&
884 !TID.OpInfo[OpIdx].isPredicate() &&
885 !TID.OpInfo[OpIdx].isOptionalDef())
886 Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
891 void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
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;
903 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
905 const MachineOperand &MO1 = MI.getOperand(OpIdx++);
906 const MachineOperand &MO2 = MI.getOperand(OpIdx);
908 // Two register operand form.
910 Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
913 Binary |= getMachineOpValue(MI, MO2);
916 Binary |= getMachineOpValue(MI, MO1);
919 // Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
920 if (MI.getOperand(OpIdx).isImm() &&
921 !TID.OpInfo[OpIdx].isPredicate() &&
922 !TID.OpInfo[OpIdx].isOptionalDef())
923 Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
928 void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
929 const TargetInstrDesc &TID = MI.getDesc();
931 // Part of binary is determined by TableGn.
932 unsigned Binary = getBinaryCodeForInstr(MI);
934 // Set the conditional execution predicate
935 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
940 Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
942 const MachineOperand &MO = MI.getOperand(OpIdx++);
943 if (OpIdx == TID.getNumOperands() ||
944 TID.OpInfo[OpIdx].isPredicate() ||
945 TID.OpInfo[OpIdx].isOptionalDef()) {
946 // Encode Rm and it's done.
947 Binary |= getMachineOpValue(MI, MO);
953 Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
956 Binary |= getMachineOpValue(MI, OpIdx++);
959 unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
960 assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
961 Binary |= ShiftAmt << ARMII::ShiftShift;
966 void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
967 const TargetInstrDesc &TID = MI.getDesc();
969 if (TID.Opcode == ARM::TPsoft)
972 // Part of binary is determined by TableGn.
973 unsigned Binary = getBinaryCodeForInstr(MI);
975 // Set the conditional execution predicate
976 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
978 // Set signed_immed_24 field
979 Binary |= getMachineOpValue(MI, 0);
984 void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
985 // Remember the base address of the inline jump table.
986 intptr_t JTBase = MCE.getCurrentPCValue();
987 JTI->addJumpTableBaseAddr(JTIndex, JTBase);
988 DOUT << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase << '\n';
990 // Now emit the jump table entries.
991 const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
992 for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
994 // DestBB address - JT base.
995 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
997 // Absolute DestBB address.
998 emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1003 void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1004 const TargetInstrDesc &TID = MI.getDesc();
1006 // Handle jump tables.
1007 if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1008 // First emit a ldr pc, [] instruction.
1009 emitDataProcessingInstruction(MI, ARM::PC);
1011 // Then emit the inline jump table.
1012 unsigned JTIndex = (TID.Opcode == ARM::BR_JTr)
1013 ? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1014 emitInlineJumpTable(JTIndex);
1016 } else if (TID.Opcode == ARM::BR_JTm) {
1017 // First emit a ldr pc, [] instruction.
1018 emitLoadStoreInstruction(MI, ARM::PC);
1020 // Then emit the inline jump table.
1021 emitInlineJumpTable(MI.getOperand(3).getIndex());
1025 // Part of binary is determined by TableGn.
1026 unsigned Binary = getBinaryCodeForInstr(MI);
1028 // Set the conditional execution predicate
1029 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1031 if (TID.Opcode == ARM::BX_RET)
1032 // The return register is LR.
1033 Binary |= ARMRegisterInfo::getRegisterNumbering(ARM::LR);
1035 // otherwise, set the return register
1036 Binary |= getMachineOpValue(MI, 0);
1041 void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1042 const TargetInstrDesc &TID = MI.getDesc();
1044 // Part of binary is determined by TableGn.
1045 unsigned Binary = getBinaryCodeForInstr(MI);
1047 // Set the conditional execution predicate
1048 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1051 assert((Binary & ARMII::D_BitShift) == 0 &&
1052 (Binary & ARMII::N_BitShift) == 0 &&
1053 (Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1056 unsigned RegD = MI.getOperand(OpIdx++).getReg();
1057 bool isSPVFP = false;
1058 RegD = ARMRegisterInfo::getRegisterNumbering(RegD, isSPVFP);
1060 Binary |= RegD << ARMII::RegRdShift;
1062 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1063 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1067 // If this is a two-address operand, skip it, e.g. FMACD.
1068 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1072 if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm) {
1073 unsigned RegN = MI.getOperand(OpIdx++).getReg();
1075 RegN = ARMRegisterInfo::getRegisterNumbering(RegN, isSPVFP);
1077 Binary |= RegN << ARMII::RegRnShift;
1079 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1080 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1085 unsigned RegM = MI.getOperand(OpIdx++).getReg();
1087 RegM = ARMRegisterInfo::getRegisterNumbering(RegM, isSPVFP);
1091 Binary |= ((RegM & 0x1E) >> 1);
1092 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1098 void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
1099 const TargetInstrDesc &TID = MI.getDesc();
1101 // Part of binary is determined by TableGn.
1102 unsigned Binary = getBinaryCodeForInstr(MI);
1104 // Set the conditional execution predicate
1105 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1107 // FMDRR encodes registers in reverse order.
1108 unsigned Form = TID.TSFlags & ARMII::FormMask;
1109 unsigned OpIdx = (Form == ARMII::VFPConv2Frm)
1110 ? MI.findFirstPredOperandIdx()-1 : 0;
1113 unsigned RegD = MI.getOperand(OpIdx).getReg();
1114 bool isSPVFP = false;
1115 RegD = ARMRegisterInfo::getRegisterNumbering(RegD, isSPVFP);
1117 Binary |= RegD << ARMII::RegRdShift;
1119 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1120 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1122 if (Form == ARMII::VFPConv2Frm)
1127 if (Form == ARMII::VFPConv3Frm) {
1128 unsigned RegM = MI.getOperand(OpIdx).getReg();
1130 RegM = ARMRegisterInfo::getRegisterNumbering(RegM, isSPVFP);
1134 Binary |= ((RegM & 0x1E) >> 1);
1135 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1143 unsigned RegN = MI.getOperand(OpIdx).getReg();
1145 RegN = ARMRegisterInfo::getRegisterNumbering(RegN, isSPVFP);
1147 Binary |= RegN << ARMII::RegRnShift;
1149 Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1150 Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1152 if (Form == ARMII::VFPConv2Frm)
1157 // FMRS / FMSR do not have Rm.
1158 if (TID.getNumOperands() > OpIdx && MI.getOperand(OpIdx).isReg()) {
1159 unsigned RegM = MI.getOperand(OpIdx).getReg();
1161 RegM = ARMRegisterInfo::getRegisterNumbering(RegM, isSPVFP);
1165 Binary |= ((RegM & 0x1E) >> 1);
1166 Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1173 void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1174 // Part of binary is determined by TableGn.
1175 unsigned Binary = getBinaryCodeForInstr(MI);
1177 // Set the conditional execution predicate
1178 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1183 unsigned RegD = MI.getOperand(OpIdx++).getReg();
1184 bool isSPVFP = false;
1185 RegD = ARMRegisterInfo::getRegisterNumbering(RegD, isSPVFP);
1187 Binary |= RegD << ARMII::RegRdShift;
1189 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1190 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1193 // Encode address base.
1194 const MachineOperand &Base = MI.getOperand(OpIdx++);
1195 Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1197 // If there is a non-zero immediate offset, encode it.
1199 const MachineOperand &Offset = MI.getOperand(OpIdx);
1200 if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1201 if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1202 Binary |= 1 << ARMII::U_BitShift;
1203 // Immediate offset is multiplied by 4.
1204 Binary |= ImmOffs >> 2;
1210 // If immediate offset is omitted, default to +0.
1211 Binary |= 1 << ARMII::U_BitShift;
1217 ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
1218 // Part of binary is determined by TableGn.
1219 unsigned Binary = getBinaryCodeForInstr(MI);
1221 // Set the conditional execution predicate
1222 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1224 // Set base address operand
1225 Binary |= getMachineOpValue(MI, 0) << ARMII::RegRnShift;
1227 // Set addressing mode by modifying bits U(23) and P(24)
1228 const MachineOperand &MO = MI.getOperand(1);
1229 Binary |= getAddrModeUPBits(ARM_AM::getAM5SubMode(MO.getImm()));
1232 if (ARM_AM::getAM5WBFlag(MO.getImm()))
1233 Binary |= 0x1 << ARMII::W_BitShift;
1235 // First register is encoded in Dd.
1236 unsigned RegD = MI.getOperand(4).getReg();
1237 bool isSPVFP = false;
1238 RegD = ARMRegisterInfo::getRegisterNumbering(RegD, isSPVFP);
1240 Binary |= RegD << ARMII::RegRdShift;
1242 Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1243 Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1246 // Number of registers are encoded in offset field.
1247 unsigned NumRegs = 1;
1248 for (unsigned i = 5, e = MI.getNumOperands(); i != e; ++i) {
1249 const MachineOperand &MO = MI.getOperand(i);
1250 if (!MO.isReg() || MO.isImplicit())
1254 Binary |= NumRegs * 2;
1259 void ARMCodeEmitter::emitMiscInstruction(const MachineInstr &MI) {
1260 // Part of binary is determined by TableGn.
1261 unsigned Binary = getBinaryCodeForInstr(MI);
1263 // Set the conditional execution predicate
1264 Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1269 #include "ARMGenCodeEmitter.inc"