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"
15 #include "MCTargetDesc/ARMAddressingModes.h"
16 #include "MCTargetDesc/ARMBaseInfo.h"
17 #include "MCTargetDesc/ARMFixupKinds.h"
18 #include "MCTargetDesc/ARMMCExpr.h"
19 #include "MCTargetDesc/ARMMCTargetDesc.h"
20 #include "llvm/MC/MCCodeEmitter.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCInstrInfo.h"
24 #include "llvm/MC/MCRegisterInfo.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/ADT/APFloat.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/Support/raw_ostream.h"
32 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
33 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
36 class ARMMCCodeEmitter : public MCCodeEmitter {
37 ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
38 void operator=(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
39 const MCInstrInfo &MCII;
40 const MCSubtargetInfo &STI;
43 ARMMCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
45 : MCII(mcii), STI(sti) {
48 ~ARMMCCodeEmitter() {}
50 bool isThumb() const {
51 // FIXME: Can tablegen auto-generate this?
52 return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
54 bool isThumb2() const {
55 return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
57 bool isTargetDarwin() const {
58 Triple TT(STI.getTargetTriple());
59 Triple::OSType OS = TT.getOS();
60 return OS == Triple::Darwin || OS == Triple::MacOSX || OS == Triple::IOS;
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 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
76 /// the specified operand. This is used for operands with :lower16: and
77 /// :upper16: prefixes.
78 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
79 SmallVectorImpl<MCFixup> &Fixups) const;
81 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
82 unsigned &Reg, unsigned &Imm,
83 SmallVectorImpl<MCFixup> &Fixups) const;
85 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
87 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
88 SmallVectorImpl<MCFixup> &Fixups) const;
90 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
91 /// BLX branch target.
92 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
93 SmallVectorImpl<MCFixup> &Fixups) const;
95 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
96 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
97 SmallVectorImpl<MCFixup> &Fixups) const;
99 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
100 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
101 SmallVectorImpl<MCFixup> &Fixups) const;
103 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
104 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
105 SmallVectorImpl<MCFixup> &Fixups) const;
107 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
109 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
110 SmallVectorImpl<MCFixup> &Fixups) const;
112 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
113 /// immediate Thumb2 direct branch target.
114 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
115 SmallVectorImpl<MCFixup> &Fixups) const;
117 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
119 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
120 SmallVectorImpl<MCFixup> &Fixups) const;
121 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
122 SmallVectorImpl<MCFixup> &Fixups) const;
124 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
125 /// ADR label target.
126 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
127 SmallVectorImpl<MCFixup> &Fixups) const;
128 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
129 SmallVectorImpl<MCFixup> &Fixups) const;
130 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
131 SmallVectorImpl<MCFixup> &Fixups) const;
134 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
136 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
137 SmallVectorImpl<MCFixup> &Fixups) const;
139 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
140 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
141 SmallVectorImpl<MCFixup> &Fixups)const;
143 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
145 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
146 SmallVectorImpl<MCFixup> &Fixups) const;
149 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
150 /// operand as needed by load/store instructions.
151 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
152 SmallVectorImpl<MCFixup> &Fixups) const;
154 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
155 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
156 SmallVectorImpl<MCFixup> &Fixups) const {
157 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
159 default: assert(0 && "Unknown addressing sub-mode!");
160 case ARM_AM::da: return 0;
161 case ARM_AM::ia: return 1;
162 case ARM_AM::db: return 2;
163 case ARM_AM::ib: return 3;
166 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
168 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
170 default: llvm_unreachable("Unknown shift opc!");
171 case ARM_AM::no_shift:
172 case ARM_AM::lsl: return 0;
173 case ARM_AM::lsr: return 1;
174 case ARM_AM::asr: return 2;
176 case ARM_AM::rrx: return 3;
181 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
182 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
183 SmallVectorImpl<MCFixup> &Fixups) const;
185 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
186 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
187 SmallVectorImpl<MCFixup> &Fixups) const;
189 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
190 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
191 SmallVectorImpl<MCFixup> &Fixups) const;
193 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
194 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
195 SmallVectorImpl<MCFixup> &Fixups) const;
197 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
198 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
199 SmallVectorImpl<MCFixup> &Fixups) const;
201 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
203 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
204 SmallVectorImpl<MCFixup> &Fixups) const;
206 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
207 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
208 SmallVectorImpl<MCFixup> &Fixups) const;
210 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
211 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
212 SmallVectorImpl<MCFixup> &Fixups) const;
214 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
215 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
216 SmallVectorImpl<MCFixup> &Fixups) const;
218 /// getCCOutOpValue - Return encoding of the 's' bit.
219 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
220 SmallVectorImpl<MCFixup> &Fixups) const {
221 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
223 return MI.getOperand(Op).getReg() == ARM::CPSR;
226 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
227 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
228 SmallVectorImpl<MCFixup> &Fixups) const {
229 unsigned SoImm = MI.getOperand(Op).getImm();
230 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
231 assert(SoImmVal != -1 && "Not a valid so_imm value!");
233 // Encode rotate_imm.
234 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
235 << ARMII::SoRotImmShift;
238 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
242 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
243 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
244 SmallVectorImpl<MCFixup> &Fixups) const {
245 unsigned SoImm = MI.getOperand(Op).getImm();
246 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
247 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
251 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
252 SmallVectorImpl<MCFixup> &Fixups) const;
253 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
254 SmallVectorImpl<MCFixup> &Fixups) const;
255 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
256 SmallVectorImpl<MCFixup> &Fixups) const;
257 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
258 SmallVectorImpl<MCFixup> &Fixups) const;
260 /// getSORegOpValue - Return an encoded so_reg shifted register value.
261 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
262 SmallVectorImpl<MCFixup> &Fixups) const;
263 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
264 SmallVectorImpl<MCFixup> &Fixups) const;
265 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
266 SmallVectorImpl<MCFixup> &Fixups) const;
268 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
269 SmallVectorImpl<MCFixup> &Fixups) const {
270 return 64 - MI.getOperand(Op).getImm();
273 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
274 SmallVectorImpl<MCFixup> &Fixups) const;
276 unsigned getMsbOpValue(const MCInst &MI, unsigned Op,
277 SmallVectorImpl<MCFixup> &Fixups) const;
279 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
280 SmallVectorImpl<MCFixup> &Fixups) const;
281 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
282 SmallVectorImpl<MCFixup> &Fixups) const;
283 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
284 SmallVectorImpl<MCFixup> &Fixups) const;
285 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
286 SmallVectorImpl<MCFixup> &Fixups) const;
287 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
288 SmallVectorImpl<MCFixup> &Fixups) const;
290 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
291 SmallVectorImpl<MCFixup> &Fixups) const;
292 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
293 SmallVectorImpl<MCFixup> &Fixups) const;
294 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
295 SmallVectorImpl<MCFixup> &Fixups) const;
296 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
297 SmallVectorImpl<MCFixup> &Fixups) const;
299 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
300 SmallVectorImpl<MCFixup> &Fixups) const;
302 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
303 unsigned EncodedValue) const;
304 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
305 unsigned EncodedValue) const;
306 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
307 unsigned EncodedValue) const;
309 unsigned VFPThumb2PostEncoder(const MCInst &MI,
310 unsigned EncodedValue) const;
312 void EmitByte(unsigned char C, raw_ostream &OS) const {
316 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
317 // Output the constant in little endian byte order.
318 for (unsigned i = 0; i != Size; ++i) {
319 EmitByte(Val & 255, OS);
324 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
325 SmallVectorImpl<MCFixup> &Fixups) const;
328 } // end anonymous namespace
330 MCCodeEmitter *llvm::createARMMCCodeEmitter(const MCInstrInfo &MCII,
331 const MCSubtargetInfo &STI,
333 return new ARMMCCodeEmitter(MCII, STI, Ctx);
336 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
337 /// instructions, and rewrite them to their Thumb2 form if we are currently in
339 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
340 unsigned EncodedValue) const {
342 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
343 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
345 unsigned Bit24 = EncodedValue & 0x01000000;
346 unsigned Bit28 = Bit24 << 4;
347 EncodedValue &= 0xEFFFFFFF;
348 EncodedValue |= Bit28;
349 EncodedValue |= 0x0F000000;
355 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
356 /// instructions, and rewrite them to their Thumb2 form if we are currently in
358 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
359 unsigned EncodedValue) const {
361 EncodedValue &= 0xF0FFFFFF;
362 EncodedValue |= 0x09000000;
368 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
369 /// instructions, and rewrite them to their Thumb2 form if we are currently in
371 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
372 unsigned EncodedValue) const {
374 EncodedValue &= 0x00FFFFFF;
375 EncodedValue |= 0xEE000000;
381 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
382 /// them to their Thumb2 form if we are currently in Thumb2 mode.
383 unsigned ARMMCCodeEmitter::
384 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
386 EncodedValue &= 0x0FFFFFFF;
387 EncodedValue |= 0xE0000000;
392 /// getMachineOpValue - Return binary encoding of operand. If the machine
393 /// operand requires relocation, record the relocation and return zero.
394 unsigned ARMMCCodeEmitter::
395 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
396 SmallVectorImpl<MCFixup> &Fixups) const {
398 unsigned Reg = MO.getReg();
399 unsigned RegNo = getARMRegisterNumbering(Reg);
401 // Q registers are encoded as 2x their register number.
405 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
406 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
407 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
408 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
411 } else if (MO.isImm()) {
412 return static_cast<unsigned>(MO.getImm());
413 } else if (MO.isFPImm()) {
414 return static_cast<unsigned>(APFloat(MO.getFPImm())
415 .bitcastToAPInt().getHiBits(32).getLimitedValue());
418 llvm_unreachable("Unable to encode MCOperand!");
422 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
423 bool ARMMCCodeEmitter::
424 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
425 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
426 const MCOperand &MO = MI.getOperand(OpIdx);
427 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
429 Reg = getARMRegisterNumbering(MO.getReg());
431 int32_t SImm = MO1.getImm();
434 // Special value for #-0
435 if (SImm == INT32_MIN)
438 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
448 /// getBranchTargetOpValue - Helper function to get the branch target operand,
449 /// which is either an immediate or requires a fixup.
450 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
452 SmallVectorImpl<MCFixup> &Fixups) {
453 const MCOperand &MO = MI.getOperand(OpIdx);
455 // If the destination is an immediate, we have nothing to do.
456 if (MO.isImm()) return MO.getImm();
457 assert(MO.isExpr() && "Unexpected branch target type!");
458 const MCExpr *Expr = MO.getExpr();
459 MCFixupKind Kind = MCFixupKind(FixupKind);
460 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
462 // All of the information is in the fixup.
466 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
467 uint32_t ARMMCCodeEmitter::
468 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
469 SmallVectorImpl<MCFixup> &Fixups) const {
470 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl, Fixups);
473 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
474 /// BLX branch target.
475 uint32_t ARMMCCodeEmitter::
476 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
477 SmallVectorImpl<MCFixup> &Fixups) const {
478 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx, Fixups);
481 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
482 uint32_t ARMMCCodeEmitter::
483 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
484 SmallVectorImpl<MCFixup> &Fixups) const {
485 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br, Fixups);
488 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
489 uint32_t ARMMCCodeEmitter::
490 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
491 SmallVectorImpl<MCFixup> &Fixups) const {
492 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc, Fixups);
495 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
496 uint32_t ARMMCCodeEmitter::
497 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
498 SmallVectorImpl<MCFixup> &Fixups) const {
499 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
502 /// Return true if this branch has a non-always predication
503 static bool HasConditionalBranch(const MCInst &MI) {
504 int NumOp = MI.getNumOperands();
506 for (int i = 0; i < NumOp-1; ++i) {
507 const MCOperand &MCOp1 = MI.getOperand(i);
508 const MCOperand &MCOp2 = MI.getOperand(i + 1);
509 if (MCOp1.isImm() && MCOp2.isReg() &&
510 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
511 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
519 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
521 uint32_t ARMMCCodeEmitter::
522 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
523 SmallVectorImpl<MCFixup> &Fixups) const {
524 // FIXME: This really, really shouldn't use TargetMachine. We don't want
525 // coupling between MC and TM anywhere we can help it.
528 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups);
529 return getARMBranchTargetOpValue(MI, OpIdx, Fixups);
532 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
534 uint32_t ARMMCCodeEmitter::
535 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
536 SmallVectorImpl<MCFixup> &Fixups) const {
537 const MCOperand MO = MI.getOperand(OpIdx);
539 if (HasConditionalBranch(MI))
540 return ::getBranchTargetOpValue(MI, OpIdx,
541 ARM::fixup_arm_condbranch, Fixups);
542 return ::getBranchTargetOpValue(MI, OpIdx,
543 ARM::fixup_arm_uncondbranch, Fixups);
546 return MO.getImm() >> 2;
549 uint32_t ARMMCCodeEmitter::
550 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
551 SmallVectorImpl<MCFixup> &Fixups) const {
552 const MCOperand MO = MI.getOperand(OpIdx);
554 if (HasConditionalBranch(MI))
555 return ::getBranchTargetOpValue(MI, OpIdx,
556 ARM::fixup_arm_condbranch, Fixups);
557 return ::getBranchTargetOpValue(MI, OpIdx,
558 ARM::fixup_arm_uncondbranch, Fixups);
561 return MO.getImm() >> 1;
564 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
565 /// immediate branch target.
566 uint32_t ARMMCCodeEmitter::
567 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
568 SmallVectorImpl<MCFixup> &Fixups) const {
570 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups);
571 bool I = (Val & 0x800000);
572 bool J1 = (Val & 0x400000);
573 bool J2 = (Val & 0x200000);
587 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
589 uint32_t ARMMCCodeEmitter::
590 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
591 SmallVectorImpl<MCFixup> &Fixups) const {
592 const MCOperand MO = MI.getOperand(OpIdx);
594 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
596 int32_t offset = MO.getImm();
597 uint32_t Val = 0x2000;
606 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
608 uint32_t ARMMCCodeEmitter::
609 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
610 SmallVectorImpl<MCFixup> &Fixups) const {
611 const MCOperand MO = MI.getOperand(OpIdx);
613 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
618 /// getAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
620 uint32_t ARMMCCodeEmitter::
621 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
622 SmallVectorImpl<MCFixup> &Fixups) const {
623 const MCOperand MO = MI.getOperand(OpIdx);
625 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
630 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
632 uint32_t ARMMCCodeEmitter::
633 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
634 SmallVectorImpl<MCFixup> &) const {
638 const MCOperand &MO1 = MI.getOperand(OpIdx);
639 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
640 unsigned Rn = getARMRegisterNumbering(MO1.getReg());
641 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
642 return (Rm << 3) | Rn;
645 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
646 uint32_t ARMMCCodeEmitter::
647 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
648 SmallVectorImpl<MCFixup> &Fixups) const {
650 // {12} = (U)nsigned (add == '1', sub == '0')
654 // If The first operand isn't a register, we have a label reference.
655 const MCOperand &MO = MI.getOperand(OpIdx);
657 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
659 isAdd = false ; // 'U' bit is set as part of the fixup.
661 assert(MO.isExpr() && "Unexpected machine operand type!");
662 const MCExpr *Expr = MO.getExpr();
666 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
668 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
669 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
671 ++MCNumCPRelocations;
673 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
675 uint32_t Binary = Imm12 & 0xfff;
676 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
679 Binary |= (Reg << 13);
683 /// getT2AddrModeImm8s4OpValue - Return encoding info for
684 /// 'reg +/- imm8<<2' operand.
685 uint32_t ARMMCCodeEmitter::
686 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
687 SmallVectorImpl<MCFixup> &Fixups) const {
689 // {8} = (U)nsigned (add == '1', sub == '0')
693 // If The first operand isn't a register, we have a label reference.
694 const MCOperand &MO = MI.getOperand(OpIdx);
696 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
698 isAdd = false ; // 'U' bit is set as part of the fixup.
700 assert(MO.isExpr() && "Unexpected machine operand type!");
701 const MCExpr *Expr = MO.getExpr();
702 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
703 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
705 ++MCNumCPRelocations;
707 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
709 uint32_t Binary = (Imm8 >> 2) & 0xff;
710 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
713 Binary |= (Reg << 9);
717 // FIXME: This routine assumes that a binary
718 // expression will always result in a PCRel expression
719 // In reality, its only true if one or more subexpressions
720 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
721 // but this is good enough for now.
722 static bool EvaluateAsPCRel(const MCExpr *Expr) {
723 switch (Expr->getKind()) {
724 default: assert(0 && "Unexpected expression type");
725 case MCExpr::SymbolRef: return false;
726 case MCExpr::Binary: return true;
731 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
732 SmallVectorImpl<MCFixup> &Fixups) const {
733 // {20-16} = imm{15-12}
734 // {11-0} = imm{11-0}
735 const MCOperand &MO = MI.getOperand(OpIdx);
737 // Hi / lo 16 bits already extracted during earlier passes.
738 return static_cast<unsigned>(MO.getImm());
740 // Handle :upper16: and :lower16: assembly prefixes.
741 const MCExpr *E = MO.getExpr();
742 if (E->getKind() == MCExpr::Target) {
743 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
744 E = ARM16Expr->getSubExpr();
747 switch (ARM16Expr->getKind()) {
748 default: assert(0 && "Unsupported ARMFixup");
749 case ARMMCExpr::VK_ARM_HI16:
750 if (!isTargetDarwin() && EvaluateAsPCRel(E))
751 Kind = MCFixupKind(isThumb2()
752 ? ARM::fixup_t2_movt_hi16_pcrel
753 : ARM::fixup_arm_movt_hi16_pcrel);
755 Kind = MCFixupKind(isThumb2()
756 ? ARM::fixup_t2_movt_hi16
757 : ARM::fixup_arm_movt_hi16);
759 case ARMMCExpr::VK_ARM_LO16:
760 if (!isTargetDarwin() && EvaluateAsPCRel(E))
761 Kind = MCFixupKind(isThumb2()
762 ? ARM::fixup_t2_movw_lo16_pcrel
763 : ARM::fixup_arm_movw_lo16_pcrel);
765 Kind = MCFixupKind(isThumb2()
766 ? ARM::fixup_t2_movw_lo16
767 : ARM::fixup_arm_movw_lo16);
770 Fixups.push_back(MCFixup::Create(0, E, Kind));
774 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
778 uint32_t ARMMCCodeEmitter::
779 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
780 SmallVectorImpl<MCFixup> &Fixups) const {
781 const MCOperand &MO = MI.getOperand(OpIdx);
782 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
783 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
784 unsigned Rn = getARMRegisterNumbering(MO.getReg());
785 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
786 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
787 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
788 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
789 unsigned SBits = getShiftOp(ShOp);
798 uint32_t Binary = Rm;
800 Binary |= SBits << 5;
801 Binary |= ShImm << 7;
807 uint32_t ARMMCCodeEmitter::
808 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
809 SmallVectorImpl<MCFixup> &Fixups) const {
811 // {13} 1 == imm12, 0 == Rm
814 const MCOperand &MO = MI.getOperand(OpIdx);
815 unsigned Rn = getARMRegisterNumbering(MO.getReg());
816 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
821 uint32_t ARMMCCodeEmitter::
822 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
823 SmallVectorImpl<MCFixup> &Fixups) const {
824 // {13} 1 == imm12, 0 == Rm
827 const MCOperand &MO = MI.getOperand(OpIdx);
828 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
829 unsigned Imm = MO1.getImm();
830 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
831 bool isReg = MO.getReg() != 0;
832 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
833 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
835 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
836 Binary <<= 7; // Shift amount is bits [11:7]
837 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
838 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
840 return Binary | (isAdd << 12) | (isReg << 13);
843 uint32_t ARMMCCodeEmitter::
844 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
845 SmallVectorImpl<MCFixup> &Fixups) const {
848 const MCOperand &MO = MI.getOperand(OpIdx);
849 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
850 bool isAdd = MO1.getImm() != 0;
851 return getARMRegisterNumbering(MO.getReg()) | (isAdd << 4);
854 uint32_t ARMMCCodeEmitter::
855 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
856 SmallVectorImpl<MCFixup> &Fixups) const {
857 // {9} 1 == imm8, 0 == Rm
861 const MCOperand &MO = MI.getOperand(OpIdx);
862 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
863 unsigned Imm = MO1.getImm();
864 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
865 bool isImm = MO.getReg() == 0;
866 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
867 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
869 Imm8 = getARMRegisterNumbering(MO.getReg());
870 return Imm8 | (isAdd << 8) | (isImm << 9);
873 uint32_t ARMMCCodeEmitter::
874 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
875 SmallVectorImpl<MCFixup> &Fixups) const {
876 // {13} 1 == imm8, 0 == Rm
881 const MCOperand &MO = MI.getOperand(OpIdx);
882 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
883 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
884 unsigned Rn = getARMRegisterNumbering(MO.getReg());
885 unsigned Imm = MO2.getImm();
886 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
887 bool isImm = MO1.getReg() == 0;
888 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
889 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
891 Imm8 = getARMRegisterNumbering(MO1.getReg());
892 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
895 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
896 uint32_t ARMMCCodeEmitter::
897 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
898 SmallVectorImpl<MCFixup> &Fixups) const {
901 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
902 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
903 "Unexpected base register!");
905 // The immediate is already shifted for the implicit zeroes, so no change
907 return MO1.getImm() & 0xff;
910 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
911 uint32_t ARMMCCodeEmitter::
912 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
913 SmallVectorImpl<MCFixup> &Fixups) const {
917 const MCOperand &MO = MI.getOperand(OpIdx);
918 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
919 unsigned Rn = getARMRegisterNumbering(MO.getReg());
920 unsigned Imm5 = MO1.getImm();
921 return ((Imm5 & 0x1f) << 3) | Rn;
924 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
925 uint32_t ARMMCCodeEmitter::
926 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
927 SmallVectorImpl<MCFixup> &Fixups) const {
928 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups);
931 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
932 uint32_t ARMMCCodeEmitter::
933 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
934 SmallVectorImpl<MCFixup> &Fixups) const {
936 // {8} = (U)nsigned (add == '1', sub == '0')
940 // If The first operand isn't a register, we have a label reference.
941 const MCOperand &MO = MI.getOperand(OpIdx);
943 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
945 isAdd = false; // 'U' bit is handled as part of the fixup.
947 assert(MO.isExpr() && "Unexpected machine operand type!");
948 const MCExpr *Expr = MO.getExpr();
951 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
953 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
954 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
956 ++MCNumCPRelocations;
958 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
959 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
962 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
963 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
966 Binary |= (Reg << 9);
970 unsigned ARMMCCodeEmitter::
971 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
972 SmallVectorImpl<MCFixup> &Fixups) const {
973 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
974 // shifted. The second is Rs, the amount to shift by, and the third specifies
975 // the type of the shift.
983 const MCOperand &MO = MI.getOperand(OpIdx);
984 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
985 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
986 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
989 unsigned Binary = getARMRegisterNumbering(MO.getReg());
991 // Encode the shift opcode.
993 unsigned Rs = MO1.getReg();
995 // Set shift operand (bit[7:4]).
1001 default: llvm_unreachable("Unknown shift opc!");
1002 case ARM_AM::lsl: SBits = 0x1; break;
1003 case ARM_AM::lsr: SBits = 0x3; break;
1004 case ARM_AM::asr: SBits = 0x5; break;
1005 case ARM_AM::ror: SBits = 0x7; break;
1009 Binary |= SBits << 4;
1011 // Encode the shift operation Rs.
1012 // Encode Rs bit[11:8].
1013 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1014 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
1017 unsigned ARMMCCodeEmitter::
1018 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1019 SmallVectorImpl<MCFixup> &Fixups) const {
1020 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1021 // shifted. The second is the amount to shift by.
1028 const MCOperand &MO = MI.getOperand(OpIdx);
1029 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1030 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1033 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1035 // Encode the shift opcode.
1038 // Set shift operand (bit[6:4]).
1043 // RRX - 110 and bit[11:8] clear.
1045 default: llvm_unreachable("Unknown shift opc!");
1046 case ARM_AM::lsl: SBits = 0x0; break;
1047 case ARM_AM::lsr: SBits = 0x2; break;
1048 case ARM_AM::asr: SBits = 0x4; break;
1049 case ARM_AM::ror: SBits = 0x6; break;
1055 // Encode shift_imm bit[11:7].
1056 Binary |= SBits << 4;
1057 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1058 assert(Offset && "Offset must be in range 1-32!");
1059 if (Offset == 32) Offset = 0;
1060 return Binary | (Offset << 7);
1064 unsigned ARMMCCodeEmitter::
1065 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1066 SmallVectorImpl<MCFixup> &Fixups) const {
1067 const MCOperand &MO1 = MI.getOperand(OpNum);
1068 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1069 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1071 // Encoded as [Rn, Rm, imm].
1072 // FIXME: Needs fixup support.
1073 unsigned Value = getARMRegisterNumbering(MO1.getReg());
1075 Value |= getARMRegisterNumbering(MO2.getReg());
1077 Value |= MO3.getImm();
1082 unsigned ARMMCCodeEmitter::
1083 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1084 SmallVectorImpl<MCFixup> &Fixups) const {
1085 const MCOperand &MO1 = MI.getOperand(OpNum);
1086 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1088 // FIXME: Needs fixup support.
1089 unsigned Value = getARMRegisterNumbering(MO1.getReg());
1091 // Even though the immediate is 8 bits long, we need 9 bits in order
1092 // to represent the (inverse of the) sign bit.
1094 int32_t tmp = (int32_t)MO2.getImm();
1098 Value |= 256; // Set the ADD bit
1103 unsigned ARMMCCodeEmitter::
1104 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1105 SmallVectorImpl<MCFixup> &Fixups) const {
1106 const MCOperand &MO1 = MI.getOperand(OpNum);
1108 // FIXME: Needs fixup support.
1110 int32_t tmp = (int32_t)MO1.getImm();
1114 Value |= 256; // Set the ADD bit
1119 unsigned ARMMCCodeEmitter::
1120 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1121 SmallVectorImpl<MCFixup> &Fixups) const {
1122 const MCOperand &MO1 = MI.getOperand(OpNum);
1124 // FIXME: Needs fixup support.
1126 int32_t tmp = (int32_t)MO1.getImm();
1130 Value |= 4096; // Set the ADD bit
1131 Value |= tmp & 4095;
1135 unsigned ARMMCCodeEmitter::
1136 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1137 SmallVectorImpl<MCFixup> &Fixups) const {
1138 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1139 // shifted. The second is the amount to shift by.
1146 const MCOperand &MO = MI.getOperand(OpIdx);
1147 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1148 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1151 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1153 // Encode the shift opcode.
1155 // Set shift operand (bit[6:4]).
1161 default: llvm_unreachable("Unknown shift opc!");
1162 case ARM_AM::lsl: SBits = 0x0; break;
1163 case ARM_AM::lsr: SBits = 0x2; break;
1164 case ARM_AM::asr: SBits = 0x4; break;
1165 case ARM_AM::ror: SBits = 0x6; break;
1168 Binary |= SBits << 4;
1169 if (SOpc == ARM_AM::rrx)
1172 // Encode shift_imm bit[11:7].
1173 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1176 unsigned ARMMCCodeEmitter::
1177 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1178 SmallVectorImpl<MCFixup> &Fixups) const {
1179 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1181 const MCOperand &MO = MI.getOperand(Op);
1182 uint32_t v = ~MO.getImm();
1183 uint32_t lsb = CountTrailingZeros_32(v);
1184 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
1185 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1186 return lsb | (msb << 5);
1189 unsigned ARMMCCodeEmitter::
1190 getMsbOpValue(const MCInst &MI, unsigned Op,
1191 SmallVectorImpl<MCFixup> &Fixups) const {
1193 uint32_t lsb = MI.getOperand(Op-1).getImm();
1194 uint32_t width = MI.getOperand(Op).getImm();
1195 uint32_t msb = lsb+width-1;
1196 assert (width != 0 && msb < 32 && "Illegal bit width!");
1200 unsigned ARMMCCodeEmitter::
1201 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1202 SmallVectorImpl<MCFixup> &Fixups) const {
1205 // {7-0} = Number of registers
1208 // {15-0} = Bitfield of GPRs.
1209 unsigned Reg = MI.getOperand(Op).getReg();
1210 bool SPRRegs = llvm::ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1211 bool DPRRegs = llvm::ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1213 unsigned Binary = 0;
1215 if (SPRRegs || DPRRegs) {
1217 unsigned RegNo = getARMRegisterNumbering(Reg);
1218 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1219 Binary |= (RegNo & 0x1f) << 8;
1223 Binary |= NumRegs * 2;
1225 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1226 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
1227 Binary |= 1 << RegNo;
1234 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1235 /// with the alignment operand.
1236 unsigned ARMMCCodeEmitter::
1237 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1238 SmallVectorImpl<MCFixup> &Fixups) const {
1239 const MCOperand &Reg = MI.getOperand(Op);
1240 const MCOperand &Imm = MI.getOperand(Op + 1);
1242 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1245 switch (Imm.getImm()) {
1249 case 8: Align = 0x01; break;
1250 case 16: Align = 0x02; break;
1251 case 32: Align = 0x03; break;
1254 return RegNo | (Align << 4);
1257 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1258 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1259 unsigned ARMMCCodeEmitter::
1260 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1261 SmallVectorImpl<MCFixup> &Fixups) const {
1262 const MCOperand &Reg = MI.getOperand(Op);
1263 const MCOperand &Imm = MI.getOperand(Op + 1);
1265 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1268 switch (Imm.getImm()) {
1273 case 16: Align = 0x00; break;
1274 case 32: Align = 0x03; break;
1277 return RegNo | (Align << 4);
1281 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1282 /// alignment operand for use in VLD-dup instructions. This is the same as
1283 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1284 /// different for VLD4-dup.
1285 unsigned ARMMCCodeEmitter::
1286 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1287 SmallVectorImpl<MCFixup> &Fixups) const {
1288 const MCOperand &Reg = MI.getOperand(Op);
1289 const MCOperand &Imm = MI.getOperand(Op + 1);
1291 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1294 switch (Imm.getImm()) {
1298 case 8: Align = 0x01; break;
1299 case 16: Align = 0x03; break;
1302 return RegNo | (Align << 4);
1305 unsigned ARMMCCodeEmitter::
1306 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1307 SmallVectorImpl<MCFixup> &Fixups) const {
1308 const MCOperand &MO = MI.getOperand(Op);
1309 if (MO.getReg() == 0) return 0x0D;
1313 unsigned ARMMCCodeEmitter::
1314 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1315 SmallVectorImpl<MCFixup> &Fixups) const {
1316 return 8 - MI.getOperand(Op).getImm();
1319 unsigned ARMMCCodeEmitter::
1320 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1321 SmallVectorImpl<MCFixup> &Fixups) const {
1322 return 16 - MI.getOperand(Op).getImm();
1325 unsigned ARMMCCodeEmitter::
1326 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1327 SmallVectorImpl<MCFixup> &Fixups) const {
1328 return 32 - MI.getOperand(Op).getImm();
1331 unsigned ARMMCCodeEmitter::
1332 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1333 SmallVectorImpl<MCFixup> &Fixups) const {
1334 return 64 - MI.getOperand(Op).getImm();
1337 void ARMMCCodeEmitter::
1338 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1339 SmallVectorImpl<MCFixup> &Fixups) const {
1340 // Pseudo instructions don't get encoded.
1341 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1342 uint64_t TSFlags = Desc.TSFlags;
1343 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1347 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1348 Size = Desc.getSize();
1350 llvm_unreachable("Unexpected instruction size!");
1352 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1353 // Thumb 32-bit wide instructions need to emit the high order halfword
1355 if (isThumb() && Size == 4) {
1356 EmitConstant(Binary >> 16, 2, OS);
1357 EmitConstant(Binary & 0xffff, 2, OS);
1359 EmitConstant(Binary, Size, OS);
1360 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1363 #include "ARMGenMCCodeEmitter.inc"