1 //===-- ARM/ARMMCCodeEmitter.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 implements the ARMMCCodeEmitter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "mccodeemitter"
16 #include "ARMAddressingModes.h"
17 #include "ARMFixupKinds.h"
18 #include "ARMInstrInfo.h"
19 #include "llvm/MC/MCCodeEmitter.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/Support/raw_ostream.h"
26 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
27 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
30 class ARMMCCodeEmitter : public MCCodeEmitter {
31 ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
32 void operator=(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
33 const TargetMachine &TM;
34 const TargetInstrInfo &TII;
38 ARMMCCodeEmitter(TargetMachine &tm, MCContext &ctx)
39 : TM(tm), TII(*TM.getInstrInfo()), Ctx(ctx) {
42 ~ARMMCCodeEmitter() {}
44 unsigned getNumFixupKinds() const { return ARM::NumTargetFixupKinds; }
46 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
47 const static MCFixupKindInfo Infos[] = {
48 // name offset bits flags
49 { "fixup_arm_pcrel_12", 2, 12, MCFixupKindInfo::FKF_IsPCRel },
50 { "fixup_arm_vfp_pcrel_12", 3, 8, MCFixupKindInfo::FKF_IsPCRel },
51 { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
54 if (Kind < FirstTargetFixupKind)
55 return MCCodeEmitter::getFixupKindInfo(Kind);
57 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
59 return Infos[Kind - FirstTargetFixupKind];
61 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
63 // getBinaryCodeForInstr - TableGen'erated function for getting the
64 // binary encoding for an instruction.
65 unsigned getBinaryCodeForInstr(const MCInst &MI,
66 SmallVectorImpl<MCFixup> &Fixups) const;
68 /// getMachineOpValue - Return binary encoding of operand. If the machine
69 /// operand requires relocation, record the relocation and return zero.
70 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
71 SmallVectorImpl<MCFixup> &Fixups) const;
73 /// getMovtImmOpValue - Return the encoding for the movw/movt pair
74 uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
75 SmallVectorImpl<MCFixup> &Fixups) const;
77 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
78 unsigned &Reg, unsigned &Imm,
79 SmallVectorImpl<MCFixup> &Fixups) const;
81 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
83 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
84 SmallVectorImpl<MCFixup> &Fixups) const;
86 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
88 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
89 SmallVectorImpl<MCFixup> &Fixups) const;
91 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
92 /// operand as needed by load/store instructions.
93 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
94 SmallVectorImpl<MCFixup> &Fixups) const;
96 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
97 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
98 SmallVectorImpl<MCFixup> &Fixups) const {
99 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
101 default: assert(0 && "Unknown addressing sub-mode!");
102 case ARM_AM::da: return 0;
103 case ARM_AM::ia: return 1;
104 case ARM_AM::db: return 2;
105 case ARM_AM::ib: return 3;
108 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
110 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
112 default: llvm_unreachable("Unknown shift opc!");
113 case ARM_AM::no_shift:
114 case ARM_AM::lsl: return 0;
115 case ARM_AM::lsr: return 1;
116 case ARM_AM::asr: return 2;
118 case ARM_AM::rrx: return 3;
123 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
124 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
125 SmallVectorImpl<MCFixup> &Fixups) const;
127 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
128 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
129 SmallVectorImpl<MCFixup> &Fixups) const;
131 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
132 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
133 SmallVectorImpl<MCFixup> &Fixups) const;
135 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
136 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
137 SmallVectorImpl<MCFixup> &Fixups) const;
139 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
140 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
141 SmallVectorImpl<MCFixup> &Fixups) const;
143 /// getCCOutOpValue - Return encoding of the 's' bit.
144 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
145 SmallVectorImpl<MCFixup> &Fixups) const {
146 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
148 return MI.getOperand(Op).getReg() == ARM::CPSR;
151 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
152 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
153 SmallVectorImpl<MCFixup> &Fixups) const {
154 unsigned SoImm = MI.getOperand(Op).getImm();
155 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
156 assert(SoImmVal != -1 && "Not a valid so_imm value!");
158 // Encode rotate_imm.
159 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
160 << ARMII::SoRotImmShift;
163 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
167 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
168 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
169 SmallVectorImpl<MCFixup> &Fixups) const {
170 unsigned SoImm = MI.getOperand(Op).getImm();
171 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
172 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
176 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
177 SmallVectorImpl<MCFixup> &Fixups) const;
178 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
179 SmallVectorImpl<MCFixup> &Fixups) const;
180 unsigned getT2AddrModeImm12OpValue(const MCInst &MI, unsigned OpNum,
181 SmallVectorImpl<MCFixup> &Fixups) const;
183 /// getSORegOpValue - Return an encoded so_reg shifted register value.
184 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
185 SmallVectorImpl<MCFixup> &Fixups) const;
186 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
187 SmallVectorImpl<MCFixup> &Fixups) const;
189 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
190 SmallVectorImpl<MCFixup> &Fixups) const {
191 switch (MI.getOperand(Op).getImm()) {
192 default: assert (0 && "Not a valid rot_imm value!");
200 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
201 SmallVectorImpl<MCFixup> &Fixups) const {
202 return MI.getOperand(Op).getImm() - 1;
205 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
206 SmallVectorImpl<MCFixup> &Fixups) const {
207 return 64 - MI.getOperand(Op).getImm();
210 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
211 SmallVectorImpl<MCFixup> &Fixups) const;
213 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
214 SmallVectorImpl<MCFixup> &Fixups) const;
215 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
216 SmallVectorImpl<MCFixup> &Fixups) const;
217 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
218 SmallVectorImpl<MCFixup> &Fixups) const;
220 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
221 unsigned EncodedValue) const;
222 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
223 unsigned EncodedValue) const;
224 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
225 unsigned EncodedValue) const;
227 void EmitByte(unsigned char C, raw_ostream &OS) const {
231 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
232 // Output the constant in little endian byte order.
233 for (unsigned i = 0; i != Size; ++i) {
234 EmitByte(Val & 255, OS);
239 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
240 SmallVectorImpl<MCFixup> &Fixups) const;
243 } // end anonymous namespace
245 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
247 return new ARMMCCodeEmitter(TM, Ctx);
250 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
251 /// instructions, and rewrite them to their Thumb2 form if we are currently in
253 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
254 unsigned EncodedValue) const {
255 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
256 if (Subtarget.isThumb2()) {
257 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
258 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
260 unsigned Bit24 = EncodedValue & 0x01000000;
261 unsigned Bit28 = Bit24 << 4;
262 EncodedValue &= 0xEFFFFFFF;
263 EncodedValue |= Bit28;
264 EncodedValue |= 0x0F000000;
270 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
271 /// instructions, and rewrite them to their Thumb2 form if we are currently in
273 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
274 unsigned EncodedValue) const {
275 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
276 if (Subtarget.isThumb2()) {
277 EncodedValue &= 0xF0FFFFFF;
278 EncodedValue |= 0x09000000;
284 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
285 /// instructions, and rewrite them to their Thumb2 form if we are currently in
287 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
288 unsigned EncodedValue) const {
289 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
290 if (Subtarget.isThumb2()) {
291 EncodedValue &= 0x00FFFFFF;
292 EncodedValue |= 0xEE000000;
300 /// getMachineOpValue - Return binary encoding of operand. If the machine
301 /// operand requires relocation, record the relocation and return zero.
302 unsigned ARMMCCodeEmitter::
303 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
304 SmallVectorImpl<MCFixup> &Fixups) const {
306 unsigned Reg = MO.getReg();
307 unsigned RegNo = getARMRegisterNumbering(Reg);
309 // Q registers are encodes as 2x their register number.
313 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
314 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
315 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
316 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
319 } else if (MO.isImm()) {
320 return static_cast<unsigned>(MO.getImm());
321 } else if (MO.isFPImm()) {
322 return static_cast<unsigned>(APFloat(MO.getFPImm())
323 .bitcastToAPInt().getHiBits(32).getLimitedValue());
326 llvm_unreachable("Unable to encode MCOperand!");
330 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
331 bool ARMMCCodeEmitter::
332 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
333 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
334 const MCOperand &MO = MI.getOperand(OpIdx);
335 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
337 Reg = getARMRegisterNumbering(MO.getReg());
339 int32_t SImm = MO1.getImm();
342 // Special value for #-0
343 if (SImm == INT32_MIN)
346 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
356 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
358 uint32_t ARMMCCodeEmitter::
359 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
360 SmallVectorImpl<MCFixup> &Fixups) const {
361 const MCOperand &MO = MI.getOperand(OpIdx);
363 // If the destination is an immediate, we have nothing to do.
364 if (MO.isImm()) return MO.getImm();
365 assert (MO.isExpr() && "Unexpected branch target type!");
366 const MCExpr *Expr = MO.getExpr();
367 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_branch);
368 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
370 // All of the information is in the fixup.
374 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
375 uint32_t ARMMCCodeEmitter::
376 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
377 SmallVectorImpl<MCFixup> &Fixups) const {
379 // {12} = (U)nsigned (add == '1', sub == '0')
383 // If The first operand isn't a register, we have a label reference.
384 const MCOperand &MO = MI.getOperand(OpIdx);
386 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
389 assert(MO.isExpr() && "Unexpected machine operand type!");
390 const MCExpr *Expr = MO.getExpr();
391 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_12);
392 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
394 ++MCNumCPRelocations;
396 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
398 uint32_t Binary = Imm12 & 0xfff;
399 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
402 Binary |= (Reg << 13);
406 uint32_t ARMMCCodeEmitter::
407 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
408 SmallVectorImpl<MCFixup> &Fixups) const {
409 // {20-16} = imm{15-12}
410 // {11-0} = imm{11-0}
411 const MCOperand &MO = MI.getOperand(OpIdx);
413 return static_cast<unsigned>(MO.getImm());
414 } else if (const MCSymbolRefExpr *Expr =
415 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
417 switch (Expr->getKind()) {
418 default: assert(0 && "Unsupported ARMFixup");
419 case MCSymbolRefExpr::VK_ARM_HI16:
420 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
422 case MCSymbolRefExpr::VK_ARM_LO16:
423 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
426 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
429 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
433 uint32_t ARMMCCodeEmitter::
434 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
435 SmallVectorImpl<MCFixup> &Fixups) const {
436 const MCOperand &MO = MI.getOperand(OpIdx);
437 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
438 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
439 unsigned Rn = getARMRegisterNumbering(MO.getReg());
440 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
441 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
442 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
443 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
444 unsigned SBits = getShiftOp(ShOp);
453 uint32_t Binary = Rm;
455 Binary |= SBits << 5;
456 Binary |= ShImm << 7;
462 uint32_t ARMMCCodeEmitter::
463 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
464 SmallVectorImpl<MCFixup> &Fixups) const {
466 // {13} 1 == imm12, 0 == Rm
469 const MCOperand &MO = MI.getOperand(OpIdx);
470 unsigned Rn = getARMRegisterNumbering(MO.getReg());
471 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
476 uint32_t ARMMCCodeEmitter::
477 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
478 SmallVectorImpl<MCFixup> &Fixups) const {
479 // {13} 1 == imm12, 0 == Rm
482 const MCOperand &MO = MI.getOperand(OpIdx);
483 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
484 unsigned Imm = MO1.getImm();
485 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
486 bool isReg = MO.getReg() != 0;
487 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
488 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
490 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
491 Binary <<= 7; // Shift amount is bits [11:7]
492 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
493 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
495 return Binary | (isAdd << 12) | (isReg << 13);
498 uint32_t ARMMCCodeEmitter::
499 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
500 SmallVectorImpl<MCFixup> &Fixups) const {
501 // {9} 1 == imm8, 0 == Rm
505 const MCOperand &MO = MI.getOperand(OpIdx);
506 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
507 unsigned Imm = MO1.getImm();
508 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
509 bool isImm = MO.getReg() == 0;
510 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
511 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
513 Imm8 = getARMRegisterNumbering(MO.getReg());
514 return Imm8 | (isAdd << 8) | (isImm << 9);
517 uint32_t ARMMCCodeEmitter::
518 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
519 SmallVectorImpl<MCFixup> &Fixups) const {
520 // {13} 1 == imm8, 0 == Rm
525 const MCOperand &MO = MI.getOperand(OpIdx);
526 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
527 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
528 unsigned Rn = getARMRegisterNumbering(MO.getReg());
529 unsigned Imm = MO2.getImm();
530 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
531 bool isImm = MO1.getReg() == 0;
532 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
533 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
535 Imm8 = getARMRegisterNumbering(MO1.getReg());
536 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
539 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm12' operand.
540 uint32_t ARMMCCodeEmitter::
541 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
542 SmallVectorImpl<MCFixup> &Fixups) const {
544 // {8} = (U)nsigned (add == '1', sub == '0')
547 // If The first operand isn't a register, we have a label reference.
548 const MCOperand &MO = MI.getOperand(OpIdx);
550 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
553 assert(MO.isExpr() && "Unexpected machine operand type!");
554 const MCExpr *Expr = MO.getExpr();
555 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_vfp_pcrel_12);
556 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
558 ++MCNumCPRelocations;
560 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
562 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
563 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
564 if (ARM_AM::getAM5Op(Imm8) == ARM_AM::add)
566 Binary |= (Reg << 9);
570 unsigned ARMMCCodeEmitter::
571 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
572 SmallVectorImpl<MCFixup> &Fixups) const {
573 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
574 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
575 // case the imm contains the amount to shift by.
578 // {4} = 1 if reg shift, 0 if imm shift
586 const MCOperand &MO = MI.getOperand(OpIdx);
587 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
588 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
589 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
592 unsigned Binary = getARMRegisterNumbering(MO.getReg());
594 // Encode the shift opcode.
596 unsigned Rs = MO1.getReg();
598 // Set shift operand (bit[7:4]).
603 // RRX - 0110 and bit[11:8] clear.
605 default: llvm_unreachable("Unknown shift opc!");
606 case ARM_AM::lsl: SBits = 0x1; break;
607 case ARM_AM::lsr: SBits = 0x3; break;
608 case ARM_AM::asr: SBits = 0x5; break;
609 case ARM_AM::ror: SBits = 0x7; break;
610 case ARM_AM::rrx: SBits = 0x6; break;
613 // Set shift operand (bit[6:4]).
619 default: llvm_unreachable("Unknown shift opc!");
620 case ARM_AM::lsl: SBits = 0x0; break;
621 case ARM_AM::lsr: SBits = 0x2; break;
622 case ARM_AM::asr: SBits = 0x4; break;
623 case ARM_AM::ror: SBits = 0x6; break;
627 Binary |= SBits << 4;
628 if (SOpc == ARM_AM::rrx)
631 // Encode the shift operation Rs or shift_imm (except rrx).
633 // Encode Rs bit[11:8].
634 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
635 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
638 // Encode shift_imm bit[11:7].
639 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
642 unsigned ARMMCCodeEmitter::
643 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
644 SmallVectorImpl<MCFixup> &Fixups) const {
645 const MCOperand &MO1 = MI.getOperand(OpNum);
646 const MCOperand &MO2 = MI.getOperand(OpNum+1);
647 const MCOperand &MO3 = MI.getOperand(OpNum+2);
649 // Encoded as [Rn, Rm, imm].
650 // FIXME: Needs fixup support.
651 unsigned Value = getARMRegisterNumbering(MO1.getReg());
653 Value |= getARMRegisterNumbering(MO2.getReg());
655 Value |= MO3.getImm();
660 unsigned ARMMCCodeEmitter::
661 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
662 SmallVectorImpl<MCFixup> &Fixups) const {
663 const MCOperand &MO1 = MI.getOperand(OpNum);
664 const MCOperand &MO2 = MI.getOperand(OpNum+1);
666 // FIXME: Needs fixup support.
667 unsigned Value = getARMRegisterNumbering(MO1.getReg());
669 // Even though the immediate is 8 bits long, we need 9 bits in order
670 // to represent the (inverse of the) sign bit.
672 Value |= ((int32_t)MO2.getImm()) & 511;
673 Value ^= 256; // Invert the sign bit.
677 unsigned ARMMCCodeEmitter::
678 getT2AddrModeImm12OpValue(const MCInst &MI, unsigned OpNum,
679 SmallVectorImpl<MCFixup> &Fixups) const {
680 const MCOperand &MO1 = MI.getOperand(OpNum);
681 const MCOperand &MO2 = MI.getOperand(OpNum+1);
683 // FIXME: Needs fixup support.
684 unsigned Value = getARMRegisterNumbering(MO1.getReg());
686 Value |= MO2.getImm() & 4095;
690 unsigned ARMMCCodeEmitter::
691 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
692 SmallVectorImpl<MCFixup> &Fixups) const {
693 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
694 // shifted. The second is the amount to shift by.
701 const MCOperand &MO = MI.getOperand(OpIdx);
702 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
703 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
706 unsigned Binary = getARMRegisterNumbering(MO.getReg());
708 // Encode the shift opcode.
710 // Set shift operand (bit[6:4]).
716 default: llvm_unreachable("Unknown shift opc!");
717 case ARM_AM::lsl: SBits = 0x0; break;
718 case ARM_AM::lsr: SBits = 0x2; break;
719 case ARM_AM::asr: SBits = 0x4; break;
720 case ARM_AM::ror: SBits = 0x6; break;
723 Binary |= SBits << 4;
724 if (SOpc == ARM_AM::rrx)
727 // Encode shift_imm bit[11:7].
728 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
731 unsigned ARMMCCodeEmitter::
732 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
733 SmallVectorImpl<MCFixup> &Fixups) const {
734 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
736 const MCOperand &MO = MI.getOperand(Op);
737 uint32_t v = ~MO.getImm();
738 uint32_t lsb = CountTrailingZeros_32(v);
739 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
740 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
741 return lsb | (msb << 5);
744 unsigned ARMMCCodeEmitter::
745 getRegisterListOpValue(const MCInst &MI, unsigned Op,
746 SmallVectorImpl<MCFixup> &Fixups) const {
749 // {7-0} = Number of registers
752 // {15-0} = Bitfield of GPRs.
753 unsigned Reg = MI.getOperand(Op).getReg();
754 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
755 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
759 if (SPRRegs || DPRRegs) {
761 unsigned RegNo = getARMRegisterNumbering(Reg);
762 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
763 Binary |= (RegNo & 0x1f) << 8;
767 Binary |= NumRegs * 2;
769 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
770 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
771 Binary |= 1 << RegNo;
778 unsigned ARMMCCodeEmitter::
779 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
780 SmallVectorImpl<MCFixup> &Fixups) const {
781 const MCOperand &Reg = MI.getOperand(Op);
782 const MCOperand &Imm = MI.getOperand(Op + 1);
784 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
787 switch (Imm.getImm()) {
791 case 8: Align = 0x01; break;
792 case 16: Align = 0x02; break;
793 case 32: Align = 0x03; break;
796 return RegNo | (Align << 4);
799 unsigned ARMMCCodeEmitter::
800 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
801 SmallVectorImpl<MCFixup> &Fixups) const {
802 const MCOperand &MO = MI.getOperand(Op);
803 if (MO.getReg() == 0) return 0x0D;
807 void ARMMCCodeEmitter::
808 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
809 SmallVectorImpl<MCFixup> &Fixups) const {
810 // Pseudo instructions don't get encoded.
811 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
812 uint64_t TSFlags = Desc.TSFlags;
813 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
816 // Basic size info comes from the TSFlags field.
817 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
818 default: llvm_unreachable("Unexpected instruction size!");
819 case ARMII::Size2Bytes: Size = 2; break;
820 case ARMII::Size4Bytes: Size = 4; break;
822 EmitConstant(getBinaryCodeForInstr(MI, Fixups), Size, OS);
823 ++MCNumEmitted; // Keep track of the # of mi's emitted.
826 #include "ARMGenMCCodeEmitter.inc"