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 "ARMMCExpr.h"
20 #include "ARMSubtarget.h"
21 #include "llvm/MC/MCCodeEmitter.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/ADT/Statistic.h"
25 #include "llvm/Support/raw_ostream.h"
28 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
29 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
32 class ARMMCCodeEmitter : public MCCodeEmitter {
33 ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
34 void operator=(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
35 const TargetMachine &TM;
36 const TargetInstrInfo &TII;
37 const ARMSubtarget *Subtarget;
41 ARMMCCodeEmitter(TargetMachine &tm, MCContext &ctx)
42 : TM(tm), TII(*TM.getInstrInfo()),
43 Subtarget(&TM.getSubtarget<ARMSubtarget>()), Ctx(ctx) {
46 ~ARMMCCodeEmitter() {}
48 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
50 // getBinaryCodeForInstr - TableGen'erated function for getting the
51 // binary encoding for an instruction.
52 unsigned getBinaryCodeForInstr(const MCInst &MI,
53 SmallVectorImpl<MCFixup> &Fixups) const;
55 /// getMachineOpValue - Return binary encoding of operand. If the machine
56 /// operand requires relocation, record the relocation and return zero.
57 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
58 SmallVectorImpl<MCFixup> &Fixups) const;
60 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
61 /// the specified operand. This is used for operands with :lower16: and
62 /// :upper16: prefixes.
63 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
64 SmallVectorImpl<MCFixup> &Fixups) const;
66 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
67 unsigned &Reg, unsigned &Imm,
68 SmallVectorImpl<MCFixup> &Fixups) const;
70 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
72 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
73 SmallVectorImpl<MCFixup> &Fixups) const;
75 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
76 /// BLX branch target.
77 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
78 SmallVectorImpl<MCFixup> &Fixups) const;
80 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
81 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
82 SmallVectorImpl<MCFixup> &Fixups) const;
84 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
85 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
86 SmallVectorImpl<MCFixup> &Fixups) const;
88 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
89 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
90 SmallVectorImpl<MCFixup> &Fixups) const;
92 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
94 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
95 SmallVectorImpl<MCFixup> &Fixups) const;
97 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
98 /// immediate Thumb2 direct branch target.
99 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
100 SmallVectorImpl<MCFixup> &Fixups) const;
102 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
104 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
105 SmallVectorImpl<MCFixup> &Fixups) const;
107 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
108 /// ADR label target.
109 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
110 SmallVectorImpl<MCFixup> &Fixups) const;
111 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
112 SmallVectorImpl<MCFixup> &Fixups) const;
113 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
114 SmallVectorImpl<MCFixup> &Fixups) const;
117 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
119 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
120 SmallVectorImpl<MCFixup> &Fixups) const;
122 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
123 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
124 SmallVectorImpl<MCFixup> &Fixups)const;
126 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
128 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
129 SmallVectorImpl<MCFixup> &Fixups) const;
132 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
133 /// operand as needed by load/store instructions.
134 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
135 SmallVectorImpl<MCFixup> &Fixups) const;
137 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
138 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
139 SmallVectorImpl<MCFixup> &Fixups) const {
140 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
142 default: assert(0 && "Unknown addressing sub-mode!");
143 case ARM_AM::da: return 0;
144 case ARM_AM::ia: return 1;
145 case ARM_AM::db: return 2;
146 case ARM_AM::ib: return 3;
149 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
151 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
153 default: llvm_unreachable("Unknown shift opc!");
154 case ARM_AM::no_shift:
155 case ARM_AM::lsl: return 0;
156 case ARM_AM::lsr: return 1;
157 case ARM_AM::asr: return 2;
159 case ARM_AM::rrx: return 3;
164 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
165 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups) const;
168 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
169 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
170 SmallVectorImpl<MCFixup> &Fixups) const;
172 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
173 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
174 SmallVectorImpl<MCFixup> &Fixups) const;
176 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
177 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
178 SmallVectorImpl<MCFixup> &Fixups) const;
180 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
182 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
183 SmallVectorImpl<MCFixup> &Fixups) const;
185 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
186 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
187 SmallVectorImpl<MCFixup> &Fixups) const;
189 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
190 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
191 SmallVectorImpl<MCFixup> &Fixups) const;
193 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
194 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
195 SmallVectorImpl<MCFixup> &Fixups) const;
197 /// getCCOutOpValue - Return encoding of the 's' bit.
198 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
199 SmallVectorImpl<MCFixup> &Fixups) const {
200 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
202 return MI.getOperand(Op).getReg() == ARM::CPSR;
205 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
206 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
207 SmallVectorImpl<MCFixup> &Fixups) const {
208 unsigned SoImm = MI.getOperand(Op).getImm();
209 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
210 assert(SoImmVal != -1 && "Not a valid so_imm value!");
212 // Encode rotate_imm.
213 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
214 << ARMII::SoRotImmShift;
217 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
221 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
222 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
223 SmallVectorImpl<MCFixup> &Fixups) const {
224 unsigned SoImm = MI.getOperand(Op).getImm();
225 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
226 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
230 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
231 SmallVectorImpl<MCFixup> &Fixups) const;
232 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
233 SmallVectorImpl<MCFixup> &Fixups) const;
234 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
235 SmallVectorImpl<MCFixup> &Fixups) const;
236 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
237 SmallVectorImpl<MCFixup> &Fixups) const;
239 /// getSORegOpValue - Return an encoded so_reg shifted register value.
240 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
241 SmallVectorImpl<MCFixup> &Fixups) const;
242 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
243 SmallVectorImpl<MCFixup> &Fixups) const;
245 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
246 SmallVectorImpl<MCFixup> &Fixups) const {
247 switch (MI.getOperand(Op).getImm()) {
248 default: assert (0 && "Not a valid rot_imm value!");
256 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
257 SmallVectorImpl<MCFixup> &Fixups) const {
258 return MI.getOperand(Op).getImm() - 1;
261 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
262 SmallVectorImpl<MCFixup> &Fixups) const {
263 return 64 - MI.getOperand(Op).getImm();
266 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
267 SmallVectorImpl<MCFixup> &Fixups) const;
269 unsigned getMsbOpValue(const MCInst &MI, unsigned Op,
270 SmallVectorImpl<MCFixup> &Fixups) const;
272 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
273 SmallVectorImpl<MCFixup> &Fixups) const;
274 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
275 SmallVectorImpl<MCFixup> &Fixups) const;
276 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
277 SmallVectorImpl<MCFixup> &Fixups) const;
278 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
279 SmallVectorImpl<MCFixup> &Fixups) const;
281 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
282 unsigned EncodedValue) const;
283 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
284 unsigned EncodedValue) const;
285 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
286 unsigned EncodedValue) const;
288 unsigned VFPThumb2PostEncoder(const MCInst &MI,
289 unsigned EncodedValue) const;
291 void EmitByte(unsigned char C, raw_ostream &OS) const {
295 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
296 // Output the constant in little endian byte order.
297 for (unsigned i = 0; i != Size; ++i) {
298 EmitByte(Val & 255, OS);
303 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
304 SmallVectorImpl<MCFixup> &Fixups) const;
307 } // end anonymous namespace
309 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
311 return new ARMMCCodeEmitter(TM, Ctx);
314 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
315 /// instructions, and rewrite them to their Thumb2 form if we are currently in
317 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
318 unsigned EncodedValue) const {
319 if (Subtarget->isThumb2()) {
320 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
321 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
323 unsigned Bit24 = EncodedValue & 0x01000000;
324 unsigned Bit28 = Bit24 << 4;
325 EncodedValue &= 0xEFFFFFFF;
326 EncodedValue |= Bit28;
327 EncodedValue |= 0x0F000000;
333 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
334 /// instructions, and rewrite them to their Thumb2 form if we are currently in
336 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
337 unsigned EncodedValue) const {
338 if (Subtarget->isThumb2()) {
339 EncodedValue &= 0xF0FFFFFF;
340 EncodedValue |= 0x09000000;
346 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
347 /// instructions, and rewrite them to their Thumb2 form if we are currently in
349 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
350 unsigned EncodedValue) const {
351 if (Subtarget->isThumb2()) {
352 EncodedValue &= 0x00FFFFFF;
353 EncodedValue |= 0xEE000000;
359 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
360 /// them to their Thumb2 form if we are currently in Thumb2 mode.
361 unsigned ARMMCCodeEmitter::
362 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
363 if (Subtarget->isThumb2()) {
364 EncodedValue &= 0x0FFFFFFF;
365 EncodedValue |= 0xE0000000;
370 /// getMachineOpValue - Return binary encoding of operand. If the machine
371 /// operand requires relocation, record the relocation and return zero.
372 unsigned ARMMCCodeEmitter::
373 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
374 SmallVectorImpl<MCFixup> &Fixups) const {
376 unsigned Reg = MO.getReg();
377 unsigned RegNo = getARMRegisterNumbering(Reg);
379 // Q registers are encoded as 2x their register number.
383 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
384 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
385 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
386 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
389 } else if (MO.isImm()) {
390 return static_cast<unsigned>(MO.getImm());
391 } else if (MO.isFPImm()) {
392 return static_cast<unsigned>(APFloat(MO.getFPImm())
393 .bitcastToAPInt().getHiBits(32).getLimitedValue());
396 llvm_unreachable("Unable to encode MCOperand!");
400 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
401 bool ARMMCCodeEmitter::
402 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
403 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
404 const MCOperand &MO = MI.getOperand(OpIdx);
405 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
407 Reg = getARMRegisterNumbering(MO.getReg());
409 int32_t SImm = MO1.getImm();
412 // Special value for #-0
413 if (SImm == INT32_MIN)
416 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
426 /// getBranchTargetOpValue - Helper function to get the branch target operand,
427 /// which is either an immediate or requires a fixup.
428 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
430 SmallVectorImpl<MCFixup> &Fixups) {
431 const MCOperand &MO = MI.getOperand(OpIdx);
433 // If the destination is an immediate, we have nothing to do.
434 if (MO.isImm()) return MO.getImm();
435 assert(MO.isExpr() && "Unexpected branch target type!");
436 const MCExpr *Expr = MO.getExpr();
437 MCFixupKind Kind = MCFixupKind(FixupKind);
438 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
440 // All of the information is in the fixup.
444 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
445 uint32_t ARMMCCodeEmitter::
446 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
447 SmallVectorImpl<MCFixup> &Fixups) const {
448 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl, Fixups);
451 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
452 /// BLX branch target.
453 uint32_t ARMMCCodeEmitter::
454 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
455 SmallVectorImpl<MCFixup> &Fixups) const {
456 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx, Fixups);
459 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
460 uint32_t ARMMCCodeEmitter::
461 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
462 SmallVectorImpl<MCFixup> &Fixups) const {
463 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br, Fixups);
466 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
467 uint32_t ARMMCCodeEmitter::
468 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
469 SmallVectorImpl<MCFixup> &Fixups) const {
470 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc, Fixups);
473 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
474 uint32_t ARMMCCodeEmitter::
475 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
476 SmallVectorImpl<MCFixup> &Fixups) const {
477 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
480 /// Return true if this branch has a non-always predication
481 static bool HasConditionalBranch(const MCInst &MI) {
482 int NumOp = MI.getNumOperands();
484 for (int i = 0; i < NumOp-1; ++i) {
485 const MCOperand &MCOp1 = MI.getOperand(i);
486 const MCOperand &MCOp2 = MI.getOperand(i + 1);
487 if (MCOp1.isImm() && MCOp2.isReg() &&
488 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
489 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
497 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
499 uint32_t ARMMCCodeEmitter::
500 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
501 SmallVectorImpl<MCFixup> &Fixups) const {
502 // FIXME: This really, really shouldn't use TargetMachine. We don't want
503 // coupling between MC and TM anywhere we can help it.
504 if (Subtarget->isThumb2())
506 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups);
507 return getARMBranchTargetOpValue(MI, OpIdx, Fixups);
510 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
512 uint32_t ARMMCCodeEmitter::
513 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
514 SmallVectorImpl<MCFixup> &Fixups) const {
515 if (HasConditionalBranch(MI))
516 return ::getBranchTargetOpValue(MI, OpIdx,
517 ARM::fixup_arm_condbranch, Fixups);
518 return ::getBranchTargetOpValue(MI, OpIdx,
519 ARM::fixup_arm_uncondbranch, Fixups);
525 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
526 /// immediate branch target.
527 uint32_t ARMMCCodeEmitter::
528 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
529 SmallVectorImpl<MCFixup> &Fixups) const {
531 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups);
532 bool I = (Val & 0x800000);
533 bool J1 = (Val & 0x400000);
534 bool J2 = (Val & 0x200000);
548 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
550 uint32_t ARMMCCodeEmitter::
551 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
552 SmallVectorImpl<MCFixup> &Fixups) const {
553 assert(MI.getOperand(OpIdx).isExpr() && "Unexpected adr target type!");
554 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
558 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
560 uint32_t ARMMCCodeEmitter::
561 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
562 SmallVectorImpl<MCFixup> &Fixups) const {
563 assert(MI.getOperand(OpIdx).isExpr() && "Unexpected adr target type!");
564 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
568 /// getAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
570 uint32_t ARMMCCodeEmitter::
571 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
572 SmallVectorImpl<MCFixup> &Fixups) const {
573 assert(MI.getOperand(OpIdx).isExpr() && "Unexpected adr target type!");
574 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
578 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
580 uint32_t ARMMCCodeEmitter::
581 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
582 SmallVectorImpl<MCFixup> &) const {
586 const MCOperand &MO1 = MI.getOperand(OpIdx);
587 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
588 unsigned Rn = getARMRegisterNumbering(MO1.getReg());
589 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
590 return (Rm << 3) | Rn;
593 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
594 uint32_t ARMMCCodeEmitter::
595 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
596 SmallVectorImpl<MCFixup> &Fixups) const {
598 // {12} = (U)nsigned (add == '1', sub == '0')
602 // If The first operand isn't a register, we have a label reference.
603 const MCOperand &MO = MI.getOperand(OpIdx);
604 const MCOperand &MO2 = MI.getOperand(OpIdx+1);
605 if (!MO.isReg() || (MO.getReg() == ARM::PC && MO2.isExpr())) {
606 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
608 isAdd = false ; // 'U' bit is set as part of the fixup.
610 const MCExpr *Expr = 0;
614 Expr = MO2.getExpr();
617 if (Subtarget->isThumb2())
618 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
620 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
621 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
623 ++MCNumCPRelocations;
625 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
627 uint32_t Binary = Imm12 & 0xfff;
628 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
631 Binary |= (Reg << 13);
635 /// getT2AddrModeImm8s4OpValue - Return encoding info for
636 /// 'reg +/- imm8<<2' operand.
637 uint32_t ARMMCCodeEmitter::
638 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
639 SmallVectorImpl<MCFixup> &Fixups) const {
641 // {8} = (U)nsigned (add == '1', sub == '0')
645 // If The first operand isn't a register, we have a label reference.
646 const MCOperand &MO = MI.getOperand(OpIdx);
648 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
650 isAdd = false ; // 'U' bit is set as part of the fixup.
652 assert(MO.isExpr() && "Unexpected machine operand type!");
653 const MCExpr *Expr = MO.getExpr();
654 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
655 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
657 ++MCNumCPRelocations;
659 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
661 uint32_t Binary = (Imm8 >> 2) & 0xff;
662 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
665 Binary |= (Reg << 9);
669 // FIXME: This routine assumes that a binary
670 // expression will always result in a PCRel expression
671 // In reality, its only true if one or more subexpressions
672 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
673 // but this is good enough for now.
674 static bool EvaluateAsPCRel(const MCExpr *Expr) {
675 switch (Expr->getKind()) {
676 default: assert(0 && "Unexpected expression type");
677 case MCExpr::SymbolRef: return false;
678 case MCExpr::Binary: return true;
683 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
684 SmallVectorImpl<MCFixup> &Fixups) const {
685 // {20-16} = imm{15-12}
686 // {11-0} = imm{11-0}
687 const MCOperand &MO = MI.getOperand(OpIdx);
689 // Hi / lo 16 bits already extracted during earlier passes.
690 return static_cast<unsigned>(MO.getImm());
692 // Handle :upper16: and :lower16: assembly prefixes.
693 const MCExpr *E = MO.getExpr();
694 if (E->getKind() == MCExpr::Target) {
695 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
696 E = ARM16Expr->getSubExpr();
699 switch (ARM16Expr->getKind()) {
700 default: assert(0 && "Unsupported ARMFixup");
701 case ARMMCExpr::VK_ARM_HI16:
702 if (!Subtarget->isTargetDarwin() && EvaluateAsPCRel(E))
703 Kind = MCFixupKind(Subtarget->isThumb2()
704 ? ARM::fixup_t2_movt_hi16_pcrel
705 : ARM::fixup_arm_movt_hi16_pcrel);
707 Kind = MCFixupKind(Subtarget->isThumb2()
708 ? ARM::fixup_t2_movt_hi16
709 : ARM::fixup_arm_movt_hi16);
711 case ARMMCExpr::VK_ARM_LO16:
712 if (!Subtarget->isTargetDarwin() && EvaluateAsPCRel(E))
713 Kind = MCFixupKind(Subtarget->isThumb2()
714 ? ARM::fixup_t2_movw_lo16_pcrel
715 : ARM::fixup_arm_movw_lo16_pcrel);
717 Kind = MCFixupKind(Subtarget->isThumb2()
718 ? ARM::fixup_t2_movw_lo16
719 : ARM::fixup_arm_movw_lo16);
722 Fixups.push_back(MCFixup::Create(0, E, Kind));
726 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
730 uint32_t ARMMCCodeEmitter::
731 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
732 SmallVectorImpl<MCFixup> &Fixups) const {
733 const MCOperand &MO = MI.getOperand(OpIdx);
734 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
735 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
736 unsigned Rn = getARMRegisterNumbering(MO.getReg());
737 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
738 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
739 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
740 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
741 unsigned SBits = getShiftOp(ShOp);
750 uint32_t Binary = Rm;
752 Binary |= SBits << 5;
753 Binary |= ShImm << 7;
759 uint32_t ARMMCCodeEmitter::
760 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
761 SmallVectorImpl<MCFixup> &Fixups) const {
763 // {13} 1 == imm12, 0 == Rm
766 const MCOperand &MO = MI.getOperand(OpIdx);
767 unsigned Rn = getARMRegisterNumbering(MO.getReg());
768 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
773 uint32_t ARMMCCodeEmitter::
774 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
775 SmallVectorImpl<MCFixup> &Fixups) const {
776 // {13} 1 == imm12, 0 == Rm
779 const MCOperand &MO = MI.getOperand(OpIdx);
780 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
781 unsigned Imm = MO1.getImm();
782 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
783 bool isReg = MO.getReg() != 0;
784 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
785 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
787 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
788 Binary <<= 7; // Shift amount is bits [11:7]
789 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
790 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
792 return Binary | (isAdd << 12) | (isReg << 13);
795 uint32_t ARMMCCodeEmitter::
796 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
797 SmallVectorImpl<MCFixup> &Fixups) const {
798 // {9} 1 == imm8, 0 == Rm
802 const MCOperand &MO = MI.getOperand(OpIdx);
803 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
804 unsigned Imm = MO1.getImm();
805 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
806 bool isImm = MO.getReg() == 0;
807 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
808 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
810 Imm8 = getARMRegisterNumbering(MO.getReg());
811 return Imm8 | (isAdd << 8) | (isImm << 9);
814 uint32_t ARMMCCodeEmitter::
815 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
816 SmallVectorImpl<MCFixup> &Fixups) const {
817 // {13} 1 == imm8, 0 == Rm
822 const MCOperand &MO = MI.getOperand(OpIdx);
823 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
824 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
825 unsigned Rn = getARMRegisterNumbering(MO.getReg());
826 unsigned Imm = MO2.getImm();
827 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
828 bool isImm = MO1.getReg() == 0;
829 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
830 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
832 Imm8 = getARMRegisterNumbering(MO1.getReg());
833 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
836 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
837 uint32_t ARMMCCodeEmitter::
838 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
839 SmallVectorImpl<MCFixup> &Fixups) const {
842 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
843 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
844 "Unexpected base register!");
846 // The immediate is already shifted for the implicit zeroes, so no change
848 return MO1.getImm() & 0xff;
851 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
852 uint32_t ARMMCCodeEmitter::
853 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
854 SmallVectorImpl<MCFixup> &Fixups) const {
858 const MCOperand &MO = MI.getOperand(OpIdx);
859 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
860 unsigned Rn = getARMRegisterNumbering(MO.getReg());
861 unsigned Imm5 = MO1.getImm();
862 return ((Imm5 & 0x1f) << 3) | Rn;
865 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
866 uint32_t ARMMCCodeEmitter::
867 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
868 SmallVectorImpl<MCFixup> &Fixups) const {
869 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups);
872 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
873 uint32_t ARMMCCodeEmitter::
874 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
875 SmallVectorImpl<MCFixup> &Fixups) const {
877 // {8} = (U)nsigned (add == '1', sub == '0')
881 // If The first operand isn't a register, we have a label reference.
882 const MCOperand &MO = MI.getOperand(OpIdx);
884 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
886 isAdd = false; // 'U' bit is handled as part of the fixup.
888 assert(MO.isExpr() && "Unexpected machine operand type!");
889 const MCExpr *Expr = MO.getExpr();
891 if (Subtarget->isThumb2())
892 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
894 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
895 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
897 ++MCNumCPRelocations;
899 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
900 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
903 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
904 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
907 Binary |= (Reg << 9);
911 unsigned ARMMCCodeEmitter::
912 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
913 SmallVectorImpl<MCFixup> &Fixups) const {
914 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
915 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
916 // case the imm contains the amount to shift by.
919 // {4} = 1 if reg shift, 0 if imm shift
927 const MCOperand &MO = MI.getOperand(OpIdx);
928 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
929 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
930 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
933 unsigned Binary = getARMRegisterNumbering(MO.getReg());
935 // Encode the shift opcode.
937 unsigned Rs = MO1.getReg();
939 // Set shift operand (bit[7:4]).
944 // RRX - 0110 and bit[11:8] clear.
946 default: llvm_unreachable("Unknown shift opc!");
947 case ARM_AM::lsl: SBits = 0x1; break;
948 case ARM_AM::lsr: SBits = 0x3; break;
949 case ARM_AM::asr: SBits = 0x5; break;
950 case ARM_AM::ror: SBits = 0x7; break;
951 case ARM_AM::rrx: SBits = 0x6; break;
954 // Set shift operand (bit[6:4]).
960 default: llvm_unreachable("Unknown shift opc!");
961 case ARM_AM::lsl: SBits = 0x0; break;
962 case ARM_AM::lsr: SBits = 0x2; break;
963 case ARM_AM::asr: SBits = 0x4; break;
964 case ARM_AM::ror: SBits = 0x6; break;
968 Binary |= SBits << 4;
969 if (SOpc == ARM_AM::rrx)
972 // Encode the shift operation Rs or shift_imm (except rrx).
974 // Encode Rs bit[11:8].
975 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
976 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
979 // Encode shift_imm bit[11:7].
980 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
983 unsigned ARMMCCodeEmitter::
984 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
985 SmallVectorImpl<MCFixup> &Fixups) const {
986 const MCOperand &MO1 = MI.getOperand(OpNum);
987 const MCOperand &MO2 = MI.getOperand(OpNum+1);
988 const MCOperand &MO3 = MI.getOperand(OpNum+2);
990 // Encoded as [Rn, Rm, imm].
991 // FIXME: Needs fixup support.
992 unsigned Value = getARMRegisterNumbering(MO1.getReg());
994 Value |= getARMRegisterNumbering(MO2.getReg());
996 Value |= MO3.getImm();
1001 unsigned ARMMCCodeEmitter::
1002 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1003 SmallVectorImpl<MCFixup> &Fixups) const {
1004 const MCOperand &MO1 = MI.getOperand(OpNum);
1005 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1007 // FIXME: Needs fixup support.
1008 unsigned Value = getARMRegisterNumbering(MO1.getReg());
1010 // Even though the immediate is 8 bits long, we need 9 bits in order
1011 // to represent the (inverse of the) sign bit.
1013 int32_t tmp = (int32_t)MO2.getImm();
1017 Value |= 256; // Set the ADD bit
1022 unsigned ARMMCCodeEmitter::
1023 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1024 SmallVectorImpl<MCFixup> &Fixups) const {
1025 const MCOperand &MO1 = MI.getOperand(OpNum);
1027 // FIXME: Needs fixup support.
1029 int32_t tmp = (int32_t)MO1.getImm();
1033 Value |= 256; // Set the ADD bit
1038 unsigned ARMMCCodeEmitter::
1039 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1040 SmallVectorImpl<MCFixup> &Fixups) const {
1041 const MCOperand &MO1 = MI.getOperand(OpNum);
1043 // FIXME: Needs fixup support.
1045 int32_t tmp = (int32_t)MO1.getImm();
1049 Value |= 4096; // Set the ADD bit
1050 Value |= tmp & 4095;
1054 unsigned ARMMCCodeEmitter::
1055 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1056 SmallVectorImpl<MCFixup> &Fixups) const {
1057 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1058 // shifted. The second is the amount to shift by.
1065 const MCOperand &MO = MI.getOperand(OpIdx);
1066 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1067 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1070 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1072 // Encode the shift opcode.
1074 // Set shift operand (bit[6:4]).
1080 default: llvm_unreachable("Unknown shift opc!");
1081 case ARM_AM::lsl: SBits = 0x0; break;
1082 case ARM_AM::lsr: SBits = 0x2; break;
1083 case ARM_AM::asr: SBits = 0x4; break;
1084 case ARM_AM::ror: SBits = 0x6; break;
1087 Binary |= SBits << 4;
1088 if (SOpc == ARM_AM::rrx)
1091 // Encode shift_imm bit[11:7].
1092 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1095 unsigned ARMMCCodeEmitter::
1096 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1097 SmallVectorImpl<MCFixup> &Fixups) const {
1098 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1100 const MCOperand &MO = MI.getOperand(Op);
1101 uint32_t v = ~MO.getImm();
1102 uint32_t lsb = CountTrailingZeros_32(v);
1103 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
1104 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1105 return lsb | (msb << 5);
1108 unsigned ARMMCCodeEmitter::
1109 getMsbOpValue(const MCInst &MI, unsigned Op,
1110 SmallVectorImpl<MCFixup> &Fixups) const {
1112 uint32_t lsb = MI.getOperand(Op-1).getImm();
1113 uint32_t width = MI.getOperand(Op).getImm();
1114 uint32_t msb = lsb+width-1;
1115 assert (width != 0 && msb < 32 && "Illegal bit width!");
1119 unsigned ARMMCCodeEmitter::
1120 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1121 SmallVectorImpl<MCFixup> &Fixups) const {
1124 // {7-0} = Number of registers
1127 // {15-0} = Bitfield of GPRs.
1128 unsigned Reg = MI.getOperand(Op).getReg();
1129 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
1130 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
1132 unsigned Binary = 0;
1134 if (SPRRegs || DPRRegs) {
1136 unsigned RegNo = getARMRegisterNumbering(Reg);
1137 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1138 Binary |= (RegNo & 0x1f) << 8;
1142 Binary |= NumRegs * 2;
1144 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1145 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
1146 Binary |= 1 << RegNo;
1153 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1154 /// with the alignment operand.
1155 unsigned ARMMCCodeEmitter::
1156 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1157 SmallVectorImpl<MCFixup> &Fixups) const {
1158 const MCOperand &Reg = MI.getOperand(Op);
1159 const MCOperand &Imm = MI.getOperand(Op + 1);
1161 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1164 switch (Imm.getImm()) {
1168 case 8: Align = 0x01; break;
1169 case 16: Align = 0x02; break;
1170 case 32: Align = 0x03; break;
1173 return RegNo | (Align << 4);
1176 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1177 /// alignment operand for use in VLD-dup instructions. This is the same as
1178 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1179 /// different for VLD4-dup.
1180 unsigned ARMMCCodeEmitter::
1181 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1182 SmallVectorImpl<MCFixup> &Fixups) const {
1183 const MCOperand &Reg = MI.getOperand(Op);
1184 const MCOperand &Imm = MI.getOperand(Op + 1);
1186 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1189 switch (Imm.getImm()) {
1193 case 8: Align = 0x01; break;
1194 case 16: Align = 0x03; break;
1197 return RegNo | (Align << 4);
1200 unsigned ARMMCCodeEmitter::
1201 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1202 SmallVectorImpl<MCFixup> &Fixups) const {
1203 const MCOperand &MO = MI.getOperand(Op);
1204 if (MO.getReg() == 0) return 0x0D;
1208 void ARMMCCodeEmitter::
1209 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1210 SmallVectorImpl<MCFixup> &Fixups) const {
1211 // Pseudo instructions don't get encoded.
1212 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
1213 uint64_t TSFlags = Desc.TSFlags;
1214 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1217 // Basic size info comes from the TSFlags field.
1218 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
1219 default: llvm_unreachable("Unexpected instruction size!");
1220 case ARMII::Size2Bytes: Size = 2; break;
1221 case ARMII::Size4Bytes: Size = 4; break;
1223 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1224 // Thumb 32-bit wide instructions need to emit the high order halfword
1226 if (Subtarget->isThumb() && Size == 4) {
1227 EmitConstant(Binary >> 16, 2, OS);
1228 EmitConstant(Binary & 0xffff, 2, OS);
1230 EmitConstant(Binary, Size, OS);
1231 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1234 #include "ARMGenMCCodeEmitter.inc"