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", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
50 { "fixup_arm_vfp_pcrel_12", 1, 24, 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 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
140 uint32_t getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
141 SmallVectorImpl<MCFixup> &Fixups) const;
143 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
144 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
145 SmallVectorImpl<MCFixup> &Fixups) const;
147 /// getCCOutOpValue - Return encoding of the 's' bit.
148 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
149 SmallVectorImpl<MCFixup> &Fixups) const {
150 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
152 return MI.getOperand(Op).getReg() == ARM::CPSR;
155 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
156 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
157 SmallVectorImpl<MCFixup> &Fixups) const {
158 unsigned SoImm = MI.getOperand(Op).getImm();
159 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
160 assert(SoImmVal != -1 && "Not a valid so_imm value!");
162 // Encode rotate_imm.
163 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
164 << ARMII::SoRotImmShift;
167 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
171 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
172 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
173 SmallVectorImpl<MCFixup> &Fixups) const {
174 unsigned SoImm = MI.getOperand(Op).getImm();
175 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
176 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
180 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
181 SmallVectorImpl<MCFixup> &Fixups) const;
182 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
183 SmallVectorImpl<MCFixup> &Fixups) const;
184 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
185 SmallVectorImpl<MCFixup> &Fixups) const;
186 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
187 SmallVectorImpl<MCFixup> &Fixups) const;
188 unsigned getT2AddrModeImm12OpValue(const MCInst &MI, unsigned OpNum,
189 SmallVectorImpl<MCFixup> &Fixups) const;
191 /// getSORegOpValue - Return an encoded so_reg shifted register value.
192 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
193 SmallVectorImpl<MCFixup> &Fixups) const;
194 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
195 SmallVectorImpl<MCFixup> &Fixups) const;
197 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
198 SmallVectorImpl<MCFixup> &Fixups) const {
199 switch (MI.getOperand(Op).getImm()) {
200 default: assert (0 && "Not a valid rot_imm value!");
208 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
209 SmallVectorImpl<MCFixup> &Fixups) const {
210 return MI.getOperand(Op).getImm() - 1;
213 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
214 SmallVectorImpl<MCFixup> &Fixups) const {
215 return 64 - MI.getOperand(Op).getImm();
218 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
219 SmallVectorImpl<MCFixup> &Fixups) const;
221 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
222 SmallVectorImpl<MCFixup> &Fixups) const;
223 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
224 SmallVectorImpl<MCFixup> &Fixups) const;
225 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
226 SmallVectorImpl<MCFixup> &Fixups) const;
227 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
228 SmallVectorImpl<MCFixup> &Fixups) const;
230 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
231 unsigned EncodedValue) const;
232 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
233 unsigned EncodedValue) const;
234 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
235 unsigned EncodedValue) const;
237 void EmitByte(unsigned char C, raw_ostream &OS) const {
241 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
242 // Output the constant in little endian byte order.
243 for (unsigned i = 0; i != Size; ++i) {
244 EmitByte(Val & 255, OS);
249 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
250 SmallVectorImpl<MCFixup> &Fixups) const;
253 } // end anonymous namespace
255 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
257 return new ARMMCCodeEmitter(TM, Ctx);
260 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
261 /// instructions, and rewrite them to their Thumb2 form if we are currently in
263 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
264 unsigned EncodedValue) const {
265 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
266 if (Subtarget.isThumb2()) {
267 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
268 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
270 unsigned Bit24 = EncodedValue & 0x01000000;
271 unsigned Bit28 = Bit24 << 4;
272 EncodedValue &= 0xEFFFFFFF;
273 EncodedValue |= Bit28;
274 EncodedValue |= 0x0F000000;
280 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
281 /// instructions, and rewrite them to their Thumb2 form if we are currently in
283 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
284 unsigned EncodedValue) const {
285 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
286 if (Subtarget.isThumb2()) {
287 EncodedValue &= 0xF0FFFFFF;
288 EncodedValue |= 0x09000000;
294 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
295 /// instructions, and rewrite them to their Thumb2 form if we are currently in
297 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
298 unsigned EncodedValue) const {
299 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
300 if (Subtarget.isThumb2()) {
301 EncodedValue &= 0x00FFFFFF;
302 EncodedValue |= 0xEE000000;
310 /// getMachineOpValue - Return binary encoding of operand. If the machine
311 /// operand requires relocation, record the relocation and return zero.
312 unsigned ARMMCCodeEmitter::
313 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
314 SmallVectorImpl<MCFixup> &Fixups) const {
316 unsigned Reg = MO.getReg();
317 unsigned RegNo = getARMRegisterNumbering(Reg);
319 // Q registers are encodes as 2x their register number.
323 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
324 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
325 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
326 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
329 } else if (MO.isImm()) {
330 return static_cast<unsigned>(MO.getImm());
331 } else if (MO.isFPImm()) {
332 return static_cast<unsigned>(APFloat(MO.getFPImm())
333 .bitcastToAPInt().getHiBits(32).getLimitedValue());
336 llvm_unreachable("Unable to encode MCOperand!");
340 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
341 bool ARMMCCodeEmitter::
342 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
343 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
344 const MCOperand &MO = MI.getOperand(OpIdx);
345 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
347 Reg = getARMRegisterNumbering(MO.getReg());
349 int32_t SImm = MO1.getImm();
352 // Special value for #-0
353 if (SImm == INT32_MIN)
356 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
366 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
368 uint32_t ARMMCCodeEmitter::
369 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
370 SmallVectorImpl<MCFixup> &Fixups) const {
371 const MCOperand &MO = MI.getOperand(OpIdx);
373 // If the destination is an immediate, we have nothing to do.
374 if (MO.isImm()) return MO.getImm();
375 assert (MO.isExpr() && "Unexpected branch target type!");
376 const MCExpr *Expr = MO.getExpr();
377 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_branch);
378 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
380 // All of the information is in the fixup.
384 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
385 uint32_t ARMMCCodeEmitter::
386 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
387 SmallVectorImpl<MCFixup> &Fixups) const {
389 // {12} = (U)nsigned (add == '1', sub == '0')
393 // If The first operand isn't a register, we have a label reference.
394 const MCOperand &MO = MI.getOperand(OpIdx);
396 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
398 isAdd = false ; // 'U' bit is set as part of the fixup.
400 assert(MO.isExpr() && "Unexpected machine operand type!");
401 const MCExpr *Expr = MO.getExpr();
402 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_12);
403 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
405 ++MCNumCPRelocations;
407 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
409 uint32_t Binary = Imm12 & 0xfff;
410 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
413 Binary |= (Reg << 13);
417 uint32_t ARMMCCodeEmitter::
418 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
419 SmallVectorImpl<MCFixup> &Fixups) const {
420 // {20-16} = imm{15-12}
421 // {11-0} = imm{11-0}
422 const MCOperand &MO = MI.getOperand(OpIdx);
424 return static_cast<unsigned>(MO.getImm());
425 } else if (const MCSymbolRefExpr *Expr =
426 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
428 switch (Expr->getKind()) {
429 default: assert(0 && "Unsupported ARMFixup");
430 case MCSymbolRefExpr::VK_ARM_HI16:
431 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
433 case MCSymbolRefExpr::VK_ARM_LO16:
434 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
437 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
440 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
444 uint32_t ARMMCCodeEmitter::
445 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
446 SmallVectorImpl<MCFixup> &Fixups) const {
447 const MCOperand &MO = MI.getOperand(OpIdx);
448 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
449 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
450 unsigned Rn = getARMRegisterNumbering(MO.getReg());
451 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
452 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
453 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
454 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
455 unsigned SBits = getShiftOp(ShOp);
464 uint32_t Binary = Rm;
466 Binary |= SBits << 5;
467 Binary |= ShImm << 7;
473 uint32_t ARMMCCodeEmitter::
474 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
475 SmallVectorImpl<MCFixup> &Fixups) const {
477 // {13} 1 == imm12, 0 == Rm
480 const MCOperand &MO = MI.getOperand(OpIdx);
481 unsigned Rn = getARMRegisterNumbering(MO.getReg());
482 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
487 uint32_t ARMMCCodeEmitter::
488 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
489 SmallVectorImpl<MCFixup> &Fixups) const {
490 // {13} 1 == imm12, 0 == Rm
493 const MCOperand &MO = MI.getOperand(OpIdx);
494 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
495 unsigned Imm = MO1.getImm();
496 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
497 bool isReg = MO.getReg() != 0;
498 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
499 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
501 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
502 Binary <<= 7; // Shift amount is bits [11:7]
503 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
504 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
506 return Binary | (isAdd << 12) | (isReg << 13);
509 uint32_t ARMMCCodeEmitter::
510 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
511 SmallVectorImpl<MCFixup> &Fixups) const {
512 // {9} 1 == imm8, 0 == Rm
516 const MCOperand &MO = MI.getOperand(OpIdx);
517 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
518 unsigned Imm = MO1.getImm();
519 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
520 bool isImm = MO.getReg() == 0;
521 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
522 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
524 Imm8 = getARMRegisterNumbering(MO.getReg());
525 return Imm8 | (isAdd << 8) | (isImm << 9);
528 uint32_t ARMMCCodeEmitter::
529 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
530 SmallVectorImpl<MCFixup> &Fixups) const {
531 // {13} 1 == imm8, 0 == Rm
536 const MCOperand &MO = MI.getOperand(OpIdx);
537 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
538 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
539 unsigned Rn = getARMRegisterNumbering(MO.getReg());
540 unsigned Imm = MO2.getImm();
541 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
542 bool isImm = MO1.getReg() == 0;
543 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
544 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
546 Imm8 = getARMRegisterNumbering(MO1.getReg());
547 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
550 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
551 uint32_t ARMMCCodeEmitter::
552 getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
553 SmallVectorImpl<MCFixup> &Fixups) const {
561 const MCOperand &MO = MI.getOperand(OpIdx);
562 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
563 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
564 unsigned Rn = getARMRegisterNumbering(MO.getReg());
565 unsigned Imm5 = MO1.getImm();
566 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
567 return (Rm << 3) | (Imm5 << 3) | Rn;
570 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm12' operand.
571 uint32_t ARMMCCodeEmitter::
572 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
573 SmallVectorImpl<MCFixup> &Fixups) const {
575 // {8} = (U)nsigned (add == '1', sub == '0')
579 // If The first operand isn't a register, we have a label reference.
580 const MCOperand &MO = MI.getOperand(OpIdx);
582 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
584 isAdd = false; // 'U' bit is handled as part of the fixup.
586 assert(MO.isExpr() && "Unexpected machine operand type!");
587 const MCExpr *Expr = MO.getExpr();
588 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_vfp_pcrel_12);
589 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
591 ++MCNumCPRelocations;
593 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
594 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
597 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
598 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
601 Binary |= (Reg << 9);
605 unsigned ARMMCCodeEmitter::
606 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
607 SmallVectorImpl<MCFixup> &Fixups) const {
608 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
609 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
610 // case the imm contains the amount to shift by.
613 // {4} = 1 if reg shift, 0 if imm shift
621 const MCOperand &MO = MI.getOperand(OpIdx);
622 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
623 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
624 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
627 unsigned Binary = getARMRegisterNumbering(MO.getReg());
629 // Encode the shift opcode.
631 unsigned Rs = MO1.getReg();
633 // Set shift operand (bit[7:4]).
638 // RRX - 0110 and bit[11:8] clear.
640 default: llvm_unreachable("Unknown shift opc!");
641 case ARM_AM::lsl: SBits = 0x1; break;
642 case ARM_AM::lsr: SBits = 0x3; break;
643 case ARM_AM::asr: SBits = 0x5; break;
644 case ARM_AM::ror: SBits = 0x7; break;
645 case ARM_AM::rrx: SBits = 0x6; break;
648 // Set shift operand (bit[6:4]).
654 default: llvm_unreachable("Unknown shift opc!");
655 case ARM_AM::lsl: SBits = 0x0; break;
656 case ARM_AM::lsr: SBits = 0x2; break;
657 case ARM_AM::asr: SBits = 0x4; break;
658 case ARM_AM::ror: SBits = 0x6; break;
662 Binary |= SBits << 4;
663 if (SOpc == ARM_AM::rrx)
666 // Encode the shift operation Rs or shift_imm (except rrx).
668 // Encode Rs bit[11:8].
669 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
670 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
673 // Encode shift_imm bit[11:7].
674 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
677 unsigned ARMMCCodeEmitter::
678 getT2AddrModeSORegOpValue(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);
682 const MCOperand &MO3 = MI.getOperand(OpNum+2);
684 // Encoded as [Rn, Rm, imm].
685 // FIXME: Needs fixup support.
686 unsigned Value = getARMRegisterNumbering(MO1.getReg());
688 Value |= getARMRegisterNumbering(MO2.getReg());
690 Value |= MO3.getImm();
695 unsigned ARMMCCodeEmitter::
696 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
697 SmallVectorImpl<MCFixup> &Fixups) const {
698 const MCOperand &MO1 = MI.getOperand(OpNum);
699 const MCOperand &MO2 = MI.getOperand(OpNum+1);
701 // FIXME: Needs fixup support.
702 unsigned Value = getARMRegisterNumbering(MO1.getReg());
704 // Even though the immediate is 8 bits long, we need 9 bits in order
705 // to represent the (inverse of the) sign bit.
707 int32_t tmp = (int32_t)MO2.getImm();
711 Value |= 256; // Set the ADD bit
716 unsigned ARMMCCodeEmitter::
717 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
718 SmallVectorImpl<MCFixup> &Fixups) const {
719 const MCOperand &MO1 = MI.getOperand(OpNum);
721 // FIXME: Needs fixup support.
723 int32_t tmp = (int32_t)MO1.getImm();
727 Value |= 256; // Set the ADD bit
732 unsigned ARMMCCodeEmitter::
733 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
734 SmallVectorImpl<MCFixup> &Fixups) const {
735 const MCOperand &MO1 = MI.getOperand(OpNum);
737 // FIXME: Needs fixup support.
739 int32_t tmp = (int32_t)MO1.getImm();
743 Value |= 4096; // Set the ADD bit
748 unsigned ARMMCCodeEmitter::
749 getT2AddrModeImm12OpValue(const MCInst &MI, unsigned OpNum,
750 SmallVectorImpl<MCFixup> &Fixups) const {
751 const MCOperand &MO1 = MI.getOperand(OpNum);
752 const MCOperand &MO2 = MI.getOperand(OpNum+1);
754 // FIXME: Needs fixup support.
755 unsigned Value = getARMRegisterNumbering(MO1.getReg());
757 Value |= MO2.getImm() & 4095;
761 unsigned ARMMCCodeEmitter::
762 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
763 SmallVectorImpl<MCFixup> &Fixups) const {
764 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
765 // shifted. The second is the amount to shift by.
772 const MCOperand &MO = MI.getOperand(OpIdx);
773 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
774 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
777 unsigned Binary = getARMRegisterNumbering(MO.getReg());
779 // Encode the shift opcode.
781 // Set shift operand (bit[6:4]).
787 default: llvm_unreachable("Unknown shift opc!");
788 case ARM_AM::lsl: SBits = 0x0; break;
789 case ARM_AM::lsr: SBits = 0x2; break;
790 case ARM_AM::asr: SBits = 0x4; break;
791 case ARM_AM::ror: SBits = 0x6; break;
794 Binary |= SBits << 4;
795 if (SOpc == ARM_AM::rrx)
798 // Encode shift_imm bit[11:7].
799 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
802 unsigned ARMMCCodeEmitter::
803 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
804 SmallVectorImpl<MCFixup> &Fixups) const {
805 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
807 const MCOperand &MO = MI.getOperand(Op);
808 uint32_t v = ~MO.getImm();
809 uint32_t lsb = CountTrailingZeros_32(v);
810 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
811 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
812 return lsb | (msb << 5);
815 unsigned ARMMCCodeEmitter::
816 getRegisterListOpValue(const MCInst &MI, unsigned Op,
817 SmallVectorImpl<MCFixup> &Fixups) const {
820 // {7-0} = Number of registers
823 // {15-0} = Bitfield of GPRs.
824 unsigned Reg = MI.getOperand(Op).getReg();
825 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
826 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
830 if (SPRRegs || DPRRegs) {
832 unsigned RegNo = getARMRegisterNumbering(Reg);
833 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
834 Binary |= (RegNo & 0x1f) << 8;
838 Binary |= NumRegs * 2;
840 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
841 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
842 Binary |= 1 << RegNo;
849 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
850 /// with the alignment operand.
851 unsigned ARMMCCodeEmitter::
852 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
853 SmallVectorImpl<MCFixup> &Fixups) const {
854 const MCOperand &Reg = MI.getOperand(Op);
855 const MCOperand &Imm = MI.getOperand(Op + 1);
857 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
860 switch (Imm.getImm()) {
864 case 8: Align = 0x01; break;
865 case 16: Align = 0x02; break;
866 case 32: Align = 0x03; break;
869 return RegNo | (Align << 4);
872 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
873 /// alignment operand for use in VLD-dup instructions. This is the same as
874 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
875 /// different for VLD4-dup.
876 unsigned ARMMCCodeEmitter::
877 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
878 SmallVectorImpl<MCFixup> &Fixups) const {
879 const MCOperand &Reg = MI.getOperand(Op);
880 const MCOperand &Imm = MI.getOperand(Op + 1);
882 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
885 switch (Imm.getImm()) {
889 case 8: Align = 0x01; break;
890 case 16: Align = 0x03; break;
893 return RegNo | (Align << 4);
896 unsigned ARMMCCodeEmitter::
897 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
898 SmallVectorImpl<MCFixup> &Fixups) const {
899 const MCOperand &MO = MI.getOperand(Op);
900 if (MO.getReg() == 0) return 0x0D;
904 void ARMMCCodeEmitter::
905 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
906 SmallVectorImpl<MCFixup> &Fixups) const {
907 // Pseudo instructions don't get encoded.
908 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
909 uint64_t TSFlags = Desc.TSFlags;
910 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
913 // Basic size info comes from the TSFlags field.
914 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
915 default: llvm_unreachable("Unexpected instruction size!");
916 case ARMII::Size2Bytes: Size = 2; break;
917 case ARMII::Size4Bytes: Size = 4; break;
919 EmitConstant(getBinaryCodeForInstr(MI, Fixups), Size, OS);
920 ++MCNumEmitted; // Keep track of the # of mi's emitted.
923 #include "ARMGenMCCodeEmitter.inc"