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_pcrel_10", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
51 { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
52 { "fixup_arm_movt_hi16", 0, 16, 0 },
53 { "fixup_arm_movw_lo16", 0, 16, 0 },
56 if (Kind < FirstTargetFixupKind)
57 return MCCodeEmitter::getFixupKindInfo(Kind);
59 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
61 return Infos[Kind - FirstTargetFixupKind];
63 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
65 // getBinaryCodeForInstr - TableGen'erated function for getting the
66 // binary encoding for an instruction.
67 unsigned getBinaryCodeForInstr(const MCInst &MI,
68 SmallVectorImpl<MCFixup> &Fixups) const;
70 /// getMachineOpValue - Return binary encoding of operand. If the machine
71 /// operand requires relocation, record the relocation and return zero.
72 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
73 SmallVectorImpl<MCFixup> &Fixups) const;
75 /// getMovtImmOpValue - Return the encoding for the movw/movt pair
76 uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
77 SmallVectorImpl<MCFixup> &Fixups) const;
79 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
80 unsigned &Reg, unsigned &Imm,
81 SmallVectorImpl<MCFixup> &Fixups) const;
83 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
85 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
86 SmallVectorImpl<MCFixup> &Fixups) const;
88 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
90 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
91 SmallVectorImpl<MCFixup> &Fixups) const;
93 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
95 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
96 SmallVectorImpl<MCFixup> &Fixups) const;
98 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
100 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
101 SmallVectorImpl<MCFixup> &Fixups) const;
104 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
105 /// operand as needed by load/store instructions.
106 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
107 SmallVectorImpl<MCFixup> &Fixups) const;
109 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
110 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
111 SmallVectorImpl<MCFixup> &Fixups) const {
112 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
114 default: assert(0 && "Unknown addressing sub-mode!");
115 case ARM_AM::da: return 0;
116 case ARM_AM::ia: return 1;
117 case ARM_AM::db: return 2;
118 case ARM_AM::ib: return 3;
121 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
123 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
125 default: llvm_unreachable("Unknown shift opc!");
126 case ARM_AM::no_shift:
127 case ARM_AM::lsl: return 0;
128 case ARM_AM::lsr: return 1;
129 case ARM_AM::asr: return 2;
131 case ARM_AM::rrx: return 3;
136 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
137 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
138 SmallVectorImpl<MCFixup> &Fixups) const;
140 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
141 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
142 SmallVectorImpl<MCFixup> &Fixups) const;
144 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
145 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
146 SmallVectorImpl<MCFixup> &Fixups) const;
148 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
149 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
150 SmallVectorImpl<MCFixup> &Fixups) const;
152 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
153 uint32_t getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
154 SmallVectorImpl<MCFixup> &Fixups) const;
156 /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
157 uint32_t getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
158 SmallVectorImpl<MCFixup> &Fixups) const;
160 /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
161 uint32_t getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
162 SmallVectorImpl<MCFixup> &Fixups) const;
164 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
165 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups) const;
168 /// getCCOutOpValue - Return encoding of the 's' bit.
169 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
170 SmallVectorImpl<MCFixup> &Fixups) const {
171 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
173 return MI.getOperand(Op).getReg() == ARM::CPSR;
176 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
177 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
178 SmallVectorImpl<MCFixup> &Fixups) const {
179 unsigned SoImm = MI.getOperand(Op).getImm();
180 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
181 assert(SoImmVal != -1 && "Not a valid so_imm value!");
183 // Encode rotate_imm.
184 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
185 << ARMII::SoRotImmShift;
188 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
192 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
193 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
194 SmallVectorImpl<MCFixup> &Fixups) const {
195 unsigned SoImm = MI.getOperand(Op).getImm();
196 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
197 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
201 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
202 SmallVectorImpl<MCFixup> &Fixups) const;
203 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
204 SmallVectorImpl<MCFixup> &Fixups) const;
205 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
206 SmallVectorImpl<MCFixup> &Fixups) const;
207 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
208 SmallVectorImpl<MCFixup> &Fixups) const;
210 /// getSORegOpValue - Return an encoded so_reg shifted register value.
211 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
212 SmallVectorImpl<MCFixup> &Fixups) const;
213 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
214 SmallVectorImpl<MCFixup> &Fixups) const;
216 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
217 SmallVectorImpl<MCFixup> &Fixups) const {
218 switch (MI.getOperand(Op).getImm()) {
219 default: assert (0 && "Not a valid rot_imm value!");
227 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
228 SmallVectorImpl<MCFixup> &Fixups) const {
229 return MI.getOperand(Op).getImm() - 1;
232 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
233 SmallVectorImpl<MCFixup> &Fixups) const {
234 return 64 - MI.getOperand(Op).getImm();
237 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
238 SmallVectorImpl<MCFixup> &Fixups) const;
240 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
241 SmallVectorImpl<MCFixup> &Fixups) const;
242 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
243 SmallVectorImpl<MCFixup> &Fixups) const;
244 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
245 SmallVectorImpl<MCFixup> &Fixups) const;
246 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
247 SmallVectorImpl<MCFixup> &Fixups) const;
249 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
250 unsigned EncodedValue) const;
251 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
252 unsigned EncodedValue) const;
253 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
254 unsigned EncodedValue) const;
256 void EmitByte(unsigned char C, raw_ostream &OS) const {
260 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
261 // Output the constant in little endian byte order.
262 for (unsigned i = 0; i != Size; ++i) {
263 EmitByte(Val & 255, OS);
268 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
269 SmallVectorImpl<MCFixup> &Fixups) const;
272 } // end anonymous namespace
274 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
276 return new ARMMCCodeEmitter(TM, Ctx);
279 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
280 /// instructions, and rewrite them to their Thumb2 form if we are currently in
282 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
283 unsigned EncodedValue) const {
284 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
285 if (Subtarget.isThumb2()) {
286 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
287 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
289 unsigned Bit24 = EncodedValue & 0x01000000;
290 unsigned Bit28 = Bit24 << 4;
291 EncodedValue &= 0xEFFFFFFF;
292 EncodedValue |= Bit28;
293 EncodedValue |= 0x0F000000;
299 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
300 /// instructions, and rewrite them to their Thumb2 form if we are currently in
302 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
303 unsigned EncodedValue) const {
304 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
305 if (Subtarget.isThumb2()) {
306 EncodedValue &= 0xF0FFFFFF;
307 EncodedValue |= 0x09000000;
313 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
314 /// instructions, and rewrite them to their Thumb2 form if we are currently in
316 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
317 unsigned EncodedValue) const {
318 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
319 if (Subtarget.isThumb2()) {
320 EncodedValue &= 0x00FFFFFF;
321 EncodedValue |= 0xEE000000;
329 /// getMachineOpValue - Return binary encoding of operand. If the machine
330 /// operand requires relocation, record the relocation and return zero.
331 unsigned ARMMCCodeEmitter::
332 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
333 SmallVectorImpl<MCFixup> &Fixups) const {
335 unsigned Reg = MO.getReg();
336 unsigned RegNo = getARMRegisterNumbering(Reg);
338 // Q registers are encoded as 2x their register number.
342 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
343 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
344 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
345 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
348 } else if (MO.isImm()) {
349 return static_cast<unsigned>(MO.getImm());
350 } else if (MO.isFPImm()) {
351 return static_cast<unsigned>(APFloat(MO.getFPImm())
352 .bitcastToAPInt().getHiBits(32).getLimitedValue());
355 llvm_unreachable("Unable to encode MCOperand!");
359 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
360 bool ARMMCCodeEmitter::
361 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
362 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
363 const MCOperand &MO = MI.getOperand(OpIdx);
364 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
366 Reg = getARMRegisterNumbering(MO.getReg());
368 int32_t SImm = MO1.getImm();
371 // Special value for #-0
372 if (SImm == INT32_MIN)
375 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
385 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
387 uint32_t ARMMCCodeEmitter::
388 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
389 SmallVectorImpl<MCFixup> &Fixups) const {
390 const MCOperand &MO = MI.getOperand(OpIdx);
392 // If the destination is an immediate, we have nothing to do.
393 if (MO.isImm()) return MO.getImm();
394 assert (MO.isExpr() && "Unexpected branch target type!");
395 const MCExpr *Expr = MO.getExpr();
396 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_branch);
397 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
399 // All of the information is in the fixup.
403 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
404 /// ADR label target.
405 uint32_t ARMMCCodeEmitter::
406 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
407 SmallVectorImpl<MCFixup> &Fixups) const {
408 const MCOperand &MO = MI.getOperand(OpIdx);
410 // If the destination is an immediate, we have nothing to do.
411 if (MO.isImm()) return MO.getImm();
412 assert (MO.isExpr() && "Unexpected branch target type!");
413 const MCExpr *Expr = MO.getExpr();
414 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_12);
415 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
417 // All of the information is in the fixup.
421 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
422 uint32_t ARMMCCodeEmitter::
423 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
424 SmallVectorImpl<MCFixup> &Fixups) const {
426 // {12} = (U)nsigned (add == '1', sub == '0')
430 // If The first operand isn't a register, we have a label reference.
431 const MCOperand &MO = MI.getOperand(OpIdx);
433 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
435 isAdd = false ; // 'U' bit is set as part of the fixup.
437 assert(MO.isExpr() && "Unexpected machine operand type!");
438 const MCExpr *Expr = MO.getExpr();
439 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_12);
440 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
442 ++MCNumCPRelocations;
444 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
446 uint32_t Binary = Imm12 & 0xfff;
447 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
450 Binary |= (Reg << 13);
454 /// getT2AddrModeImm8s4OpValue - Return encoding info for
455 /// 'reg +/- imm8<<2' operand.
456 uint32_t ARMMCCodeEmitter::
457 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
458 SmallVectorImpl<MCFixup> &Fixups) const {
460 // {12} = (U)nsigned (add == '1', sub == '0')
464 // If The first operand isn't a register, we have a label reference.
465 const MCOperand &MO = MI.getOperand(OpIdx);
467 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
469 isAdd = false ; // 'U' bit is set as part of the fixup.
471 assert(MO.isExpr() && "Unexpected machine operand type!");
472 const MCExpr *Expr = MO.getExpr();
473 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
474 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
476 ++MCNumCPRelocations;
478 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
480 uint32_t Binary = (Imm8 >> 2) & 0xff;
481 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
484 Binary |= (Reg << 9);
488 uint32_t ARMMCCodeEmitter::
489 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
490 SmallVectorImpl<MCFixup> &Fixups) const {
491 // {20-16} = imm{15-12}
492 // {11-0} = imm{11-0}
493 const MCOperand &MO = MI.getOperand(OpIdx);
495 return static_cast<unsigned>(MO.getImm());
496 } else if (const MCSymbolRefExpr *Expr =
497 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
499 switch (Expr->getKind()) {
500 default: assert(0 && "Unsupported ARMFixup");
501 case MCSymbolRefExpr::VK_ARM_HI16:
502 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
504 case MCSymbolRefExpr::VK_ARM_LO16:
505 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
508 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
511 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
515 uint32_t ARMMCCodeEmitter::
516 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
517 SmallVectorImpl<MCFixup> &Fixups) const {
518 const MCOperand &MO = MI.getOperand(OpIdx);
519 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
520 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
521 unsigned Rn = getARMRegisterNumbering(MO.getReg());
522 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
523 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
524 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
525 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
526 unsigned SBits = getShiftOp(ShOp);
535 uint32_t Binary = Rm;
537 Binary |= SBits << 5;
538 Binary |= ShImm << 7;
544 uint32_t ARMMCCodeEmitter::
545 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
546 SmallVectorImpl<MCFixup> &Fixups) const {
548 // {13} 1 == imm12, 0 == Rm
551 const MCOperand &MO = MI.getOperand(OpIdx);
552 unsigned Rn = getARMRegisterNumbering(MO.getReg());
553 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
558 uint32_t ARMMCCodeEmitter::
559 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
560 SmallVectorImpl<MCFixup> &Fixups) const {
561 // {13} 1 == imm12, 0 == Rm
564 const MCOperand &MO = MI.getOperand(OpIdx);
565 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
566 unsigned Imm = MO1.getImm();
567 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
568 bool isReg = MO.getReg() != 0;
569 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
570 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
572 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
573 Binary <<= 7; // Shift amount is bits [11:7]
574 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
575 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
577 return Binary | (isAdd << 12) | (isReg << 13);
580 uint32_t ARMMCCodeEmitter::
581 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
582 SmallVectorImpl<MCFixup> &Fixups) const {
583 // {9} 1 == imm8, 0 == Rm
587 const MCOperand &MO = MI.getOperand(OpIdx);
588 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
589 unsigned Imm = MO1.getImm();
590 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
591 bool isImm = MO.getReg() == 0;
592 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
593 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
595 Imm8 = getARMRegisterNumbering(MO.getReg());
596 return Imm8 | (isAdd << 8) | (isImm << 9);
599 uint32_t ARMMCCodeEmitter::
600 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
601 SmallVectorImpl<MCFixup> &Fixups) const {
602 // {13} 1 == imm8, 0 == Rm
607 const MCOperand &MO = MI.getOperand(OpIdx);
608 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
609 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
610 unsigned Rn = getARMRegisterNumbering(MO.getReg());
611 unsigned Imm = MO2.getImm();
612 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
613 bool isImm = MO1.getReg() == 0;
614 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
615 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
617 Imm8 = getARMRegisterNumbering(MO1.getReg());
618 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
621 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
622 static unsigned getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
631 const MCOperand &MO = MI.getOperand(OpIdx);
632 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
633 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
634 unsigned Rn = getARMRegisterNumbering(MO.getReg());
635 unsigned Imm5 = (MO1.getImm() / Scale) & 0x1f;
636 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
637 return (Rm << 3) | (Imm5 << 3) | Rn;
640 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
641 uint32_t ARMMCCodeEmitter::
642 getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
643 SmallVectorImpl<MCFixup> &) const {
644 return getAddrModeSOpValue(MI, OpIdx, 4);
647 /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
648 uint32_t ARMMCCodeEmitter::
649 getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
650 SmallVectorImpl<MCFixup> &) const {
651 return getAddrModeSOpValue(MI, OpIdx, 2);
654 /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
655 uint32_t ARMMCCodeEmitter::
656 getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
657 SmallVectorImpl<MCFixup> &) const {
658 return getAddrModeSOpValue(MI, OpIdx, 1);
661 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
662 uint32_t ARMMCCodeEmitter::
663 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
664 SmallVectorImpl<MCFixup> &Fixups) const {
666 // {8} = (U)nsigned (add == '1', sub == '0')
670 // If The first operand isn't a register, we have a label reference.
671 const MCOperand &MO = MI.getOperand(OpIdx);
673 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
675 isAdd = false; // 'U' bit is handled as part of the fixup.
677 assert(MO.isExpr() && "Unexpected machine operand type!");
678 const MCExpr *Expr = MO.getExpr();
679 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
680 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
682 ++MCNumCPRelocations;
684 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
685 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
688 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
689 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
692 Binary |= (Reg << 9);
696 unsigned ARMMCCodeEmitter::
697 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
698 SmallVectorImpl<MCFixup> &Fixups) const {
699 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
700 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
701 // case the imm contains the amount to shift by.
704 // {4} = 1 if reg shift, 0 if imm shift
712 const MCOperand &MO = MI.getOperand(OpIdx);
713 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
714 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
715 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
718 unsigned Binary = getARMRegisterNumbering(MO.getReg());
720 // Encode the shift opcode.
722 unsigned Rs = MO1.getReg();
724 // Set shift operand (bit[7:4]).
729 // RRX - 0110 and bit[11:8] clear.
731 default: llvm_unreachable("Unknown shift opc!");
732 case ARM_AM::lsl: SBits = 0x1; break;
733 case ARM_AM::lsr: SBits = 0x3; break;
734 case ARM_AM::asr: SBits = 0x5; break;
735 case ARM_AM::ror: SBits = 0x7; break;
736 case ARM_AM::rrx: SBits = 0x6; break;
739 // Set shift operand (bit[6:4]).
745 default: llvm_unreachable("Unknown shift opc!");
746 case ARM_AM::lsl: SBits = 0x0; break;
747 case ARM_AM::lsr: SBits = 0x2; break;
748 case ARM_AM::asr: SBits = 0x4; break;
749 case ARM_AM::ror: SBits = 0x6; break;
753 Binary |= SBits << 4;
754 if (SOpc == ARM_AM::rrx)
757 // Encode the shift operation Rs or shift_imm (except rrx).
759 // Encode Rs bit[11:8].
760 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
761 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
764 // Encode shift_imm bit[11:7].
765 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
768 unsigned ARMMCCodeEmitter::
769 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
770 SmallVectorImpl<MCFixup> &Fixups) const {
771 const MCOperand &MO1 = MI.getOperand(OpNum);
772 const MCOperand &MO2 = MI.getOperand(OpNum+1);
773 const MCOperand &MO3 = MI.getOperand(OpNum+2);
775 // Encoded as [Rn, Rm, imm].
776 // FIXME: Needs fixup support.
777 unsigned Value = getARMRegisterNumbering(MO1.getReg());
779 Value |= getARMRegisterNumbering(MO2.getReg());
781 Value |= MO3.getImm();
786 unsigned ARMMCCodeEmitter::
787 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
788 SmallVectorImpl<MCFixup> &Fixups) const {
789 const MCOperand &MO1 = MI.getOperand(OpNum);
790 const MCOperand &MO2 = MI.getOperand(OpNum+1);
792 // FIXME: Needs fixup support.
793 unsigned Value = getARMRegisterNumbering(MO1.getReg());
795 // Even though the immediate is 8 bits long, we need 9 bits in order
796 // to represent the (inverse of the) sign bit.
798 int32_t tmp = (int32_t)MO2.getImm();
802 Value |= 256; // Set the ADD bit
807 unsigned ARMMCCodeEmitter::
808 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
809 SmallVectorImpl<MCFixup> &Fixups) const {
810 const MCOperand &MO1 = MI.getOperand(OpNum);
812 // FIXME: Needs fixup support.
814 int32_t tmp = (int32_t)MO1.getImm();
818 Value |= 256; // Set the ADD bit
823 unsigned ARMMCCodeEmitter::
824 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
825 SmallVectorImpl<MCFixup> &Fixups) const {
826 const MCOperand &MO1 = MI.getOperand(OpNum);
828 // FIXME: Needs fixup support.
830 int32_t tmp = (int32_t)MO1.getImm();
834 Value |= 4096; // Set the ADD bit
839 unsigned ARMMCCodeEmitter::
840 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
841 SmallVectorImpl<MCFixup> &Fixups) const {
842 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
843 // shifted. The second is the amount to shift by.
850 const MCOperand &MO = MI.getOperand(OpIdx);
851 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
852 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
855 unsigned Binary = getARMRegisterNumbering(MO.getReg());
857 // Encode the shift opcode.
859 // Set shift operand (bit[6:4]).
865 default: llvm_unreachable("Unknown shift opc!");
866 case ARM_AM::lsl: SBits = 0x0; break;
867 case ARM_AM::lsr: SBits = 0x2; break;
868 case ARM_AM::asr: SBits = 0x4; break;
869 case ARM_AM::ror: SBits = 0x6; break;
872 Binary |= SBits << 4;
873 if (SOpc == ARM_AM::rrx)
876 // Encode shift_imm bit[11:7].
877 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
880 unsigned ARMMCCodeEmitter::
881 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
882 SmallVectorImpl<MCFixup> &Fixups) const {
883 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
885 const MCOperand &MO = MI.getOperand(Op);
886 uint32_t v = ~MO.getImm();
887 uint32_t lsb = CountTrailingZeros_32(v);
888 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
889 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
890 return lsb | (msb << 5);
893 unsigned ARMMCCodeEmitter::
894 getRegisterListOpValue(const MCInst &MI, unsigned Op,
895 SmallVectorImpl<MCFixup> &Fixups) const {
898 // {7-0} = Number of registers
901 // {15-0} = Bitfield of GPRs.
902 unsigned Reg = MI.getOperand(Op).getReg();
903 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
904 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
908 if (SPRRegs || DPRRegs) {
910 unsigned RegNo = getARMRegisterNumbering(Reg);
911 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
912 Binary |= (RegNo & 0x1f) << 8;
916 Binary |= NumRegs * 2;
918 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
919 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
920 Binary |= 1 << RegNo;
927 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
928 /// with the alignment operand.
929 unsigned ARMMCCodeEmitter::
930 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
931 SmallVectorImpl<MCFixup> &Fixups) const {
932 const MCOperand &Reg = MI.getOperand(Op);
933 const MCOperand &Imm = MI.getOperand(Op + 1);
935 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
938 switch (Imm.getImm()) {
942 case 8: Align = 0x01; break;
943 case 16: Align = 0x02; break;
944 case 32: Align = 0x03; break;
947 return RegNo | (Align << 4);
950 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
951 /// alignment operand for use in VLD-dup instructions. This is the same as
952 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
953 /// different for VLD4-dup.
954 unsigned ARMMCCodeEmitter::
955 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
956 SmallVectorImpl<MCFixup> &Fixups) const {
957 const MCOperand &Reg = MI.getOperand(Op);
958 const MCOperand &Imm = MI.getOperand(Op + 1);
960 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
963 switch (Imm.getImm()) {
967 case 8: Align = 0x01; break;
968 case 16: Align = 0x03; break;
971 return RegNo | (Align << 4);
974 unsigned ARMMCCodeEmitter::
975 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
976 SmallVectorImpl<MCFixup> &Fixups) const {
977 const MCOperand &MO = MI.getOperand(Op);
978 if (MO.getReg() == 0) return 0x0D;
982 void ARMMCCodeEmitter::
983 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
984 SmallVectorImpl<MCFixup> &Fixups) const {
985 // Pseudo instructions don't get encoded.
986 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
987 uint64_t TSFlags = Desc.TSFlags;
988 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
991 // Basic size info comes from the TSFlags field.
992 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
993 default: llvm_unreachable("Unexpected instruction size!");
994 case ARMII::Size2Bytes: Size = 2; break;
995 case ARMII::Size4Bytes: Size = 4; break;
997 EmitConstant(getBinaryCodeForInstr(MI, Fixups), Size, OS);
998 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1001 #include "ARMGenMCCodeEmitter.inc"