LLVM  16.0.0git
CSKYDisassembler.cpp
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1 //===-- CSKYDisassembler.cpp - Disassembler for CSKY ----------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the CSKYDisassembler class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "MCTargetDesc/CSKYBaseInfo.h"
14 #include "MCTargetDesc/CSKYMCTargetDesc.h"
15 #include "TargetInfo/CSKYTargetInfo.h"
16 #include "llvm/ADT/DenseMap.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/MC/MCDecoderOps.h"
19 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCInstrInfo.h"
22 #include "llvm/MC/MCRegisterInfo.h"
23 #include "llvm/MC/MCSubtargetInfo.h"
24 #include "llvm/MC/TargetRegistry.h"
25 #include "llvm/Support/Endian.h"
26 
27 using namespace llvm;
28 
29 #define DEBUG_TYPE "csky-disassembler"
30 
31 typedef MCDisassembler::DecodeStatus DecodeStatus;
32 
33 namespace {
34 class CSKYDisassembler : public MCDisassembler {
35  std::unique_ptr<MCInstrInfo const> const MCII;
36  mutable StringRef symbolName;
37 
38  DecodeStatus handleCROperand(MCInst &Instr) const;
39 
40 public:
41  CSKYDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
42  MCInstrInfo const *MCII);
43 
44  DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
45  ArrayRef<uint8_t> Bytes, uint64_t Address,
46  raw_ostream &CStream) const override;
47 };
48 } // end anonymous namespace
49 
50 CSKYDisassembler::CSKYDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
51  MCInstrInfo const *MCII)
52  : MCDisassembler(STI, Ctx), MCII(MCII) {}
53 
54 static MCDisassembler *createCSKYDisassembler(const Target &T,
55  const MCSubtargetInfo &STI,
56  MCContext &Ctx) {
57  return new CSKYDisassembler(STI, Ctx, T.createMCInstrInfo());
58 }
59 
60 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeCSKYDisassembler() {
61  TargetRegistry::RegisterMCDisassembler(getTheCSKYTarget(),
62  createCSKYDisassembler);
63 }
64 
65 static const uint16_t GPRDecoderTable[] = {
66  CSKY::R0, CSKY::R1, CSKY::R2, CSKY::R3, CSKY::R4, CSKY::R5, CSKY::R6,
67  CSKY::R7, CSKY::R8, CSKY::R9, CSKY::R10, CSKY::R11, CSKY::R12, CSKY::R13,
68  CSKY::R14, CSKY::R15, CSKY::R16, CSKY::R17, CSKY::R18, CSKY::R19, CSKY::R20,
69  CSKY::R21, CSKY::R22, CSKY::R23, CSKY::R24, CSKY::R25, CSKY::R26, CSKY::R27,
70  CSKY::R28, CSKY::R29, CSKY::R30, CSKY::R31};
71 
72 static const uint16_t GPRPairDecoderTable[] = {
73  CSKY::R0_R1, CSKY::R1_R2, CSKY::R2_R3, CSKY::R3_R4, CSKY::R4_R5,
74  CSKY::R5_R6, CSKY::R6_R7, CSKY::R7_R8, CSKY::R8_R9, CSKY::R9_R10,
75  CSKY::R10_R11, CSKY::R11_R12, CSKY::R12_R13, CSKY::R13_R14, CSKY::R14_R15,
76  CSKY::R15_R16, CSKY::R16_R17, CSKY::R17_R18, CSKY::R18_R19, CSKY::R19_R20,
77  CSKY::R20_R21, CSKY::R21_R22, CSKY::R22_R23, CSKY::R23_R24, CSKY::R24_R25,
78  CSKY::R25_R26, CSKY::R26_R27, CSKY::R27_R28, CSKY::R28_R29, CSKY::R29_R30,
79  CSKY::R30_R31, CSKY::R31_R32};
80 
81 static const uint16_t FPR32DecoderTable[] = {
82  CSKY::F0_32, CSKY::F1_32, CSKY::F2_32, CSKY::F3_32, CSKY::F4_32,
83  CSKY::F5_32, CSKY::F6_32, CSKY::F7_32, CSKY::F8_32, CSKY::F9_32,
84  CSKY::F10_32, CSKY::F11_32, CSKY::F12_32, CSKY::F13_32, CSKY::F14_32,
85  CSKY::F15_32, CSKY::F16_32, CSKY::F17_32, CSKY::F18_32, CSKY::F19_32,
86  CSKY::F20_32, CSKY::F21_32, CSKY::F22_32, CSKY::F23_32, CSKY::F24_32,
87  CSKY::F25_32, CSKY::F26_32, CSKY::F27_32, CSKY::F28_32, CSKY::F29_32,
88  CSKY::F30_32, CSKY::F31_32};
89 
90 static const uint16_t FPR64DecoderTable[] = {
91  CSKY::F0_64, CSKY::F1_64, CSKY::F2_64, CSKY::F3_64, CSKY::F4_64,
92  CSKY::F5_64, CSKY::F6_64, CSKY::F7_64, CSKY::F8_64, CSKY::F9_64,
93  CSKY::F10_64, CSKY::F11_64, CSKY::F12_64, CSKY::F13_64, CSKY::F14_64,
94  CSKY::F15_64, CSKY::F16_64, CSKY::F17_64, CSKY::F18_64, CSKY::F19_64,
95  CSKY::F20_64, CSKY::F21_64, CSKY::F22_64, CSKY::F23_64, CSKY::F24_64,
96  CSKY::F25_64, CSKY::F26_64, CSKY::F27_64, CSKY::F28_64, CSKY::F29_64,
97  CSKY::F30_64, CSKY::F31_64};
98 
99 static const uint16_t FPR128DecoderTable[] = {
100  CSKY::F0_128, CSKY::F1_128, CSKY::F2_128, CSKY::F3_128, CSKY::F4_128,
101  CSKY::F5_128, CSKY::F6_128, CSKY::F7_128, CSKY::F8_128, CSKY::F9_128,
102  CSKY::F10_128, CSKY::F11_128, CSKY::F12_128, CSKY::F13_128, CSKY::F14_128,
103  CSKY::F15_128, CSKY::F16_128, CSKY::F17_128, CSKY::F18_128, CSKY::F19_128,
104  CSKY::F20_128, CSKY::F21_128, CSKY::F22_128, CSKY::F23_128, CSKY::F24_128,
105  CSKY::F25_128, CSKY::F26_128, CSKY::F27_128, CSKY::F28_128, CSKY::F29_128,
106  CSKY::F30_128, CSKY::F31_128};
107 
108 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, uint64_t RegNo,
109  uint64_t Address,
110  const MCDisassembler *Decoder) {
111  if (RegNo >= 32)
112  return MCDisassembler::Fail;
113 
114  Inst.addOperand(MCOperand::createReg(GPRDecoderTable[RegNo]));
115  return MCDisassembler::Success;
116 }
117 
118 static DecodeStatus DecodeFPR32RegisterClass(MCInst &Inst, uint64_t RegNo,
119  uint64_t Address,
120  const MCDisassembler *Decoder) {
121  if (RegNo >= 32)
122  return MCDisassembler::Fail;
123 
124  Inst.addOperand(MCOperand::createReg(FPR32DecoderTable[RegNo]));
125  return MCDisassembler::Success;
126 }
127 
128 static DecodeStatus DecodesFPR32RegisterClass(MCInst &Inst, uint64_t RegNo,
129  uint64_t Address,
130  const MCDisassembler *Decoder) {
131  if (RegNo >= 16)
132  return MCDisassembler::Fail;
133 
134  Inst.addOperand(MCOperand::createReg(FPR32DecoderTable[RegNo]));
135  return MCDisassembler::Success;
136 }
137 
138 static DecodeStatus DecodesFPR64RegisterClass(MCInst &Inst, uint64_t RegNo,
139  uint64_t Address,
140  const MCDisassembler *Decoder) {
141  if (RegNo >= 16)
142  return MCDisassembler::Fail;
143 
144  Inst.addOperand(MCOperand::createReg(FPR64DecoderTable[RegNo]));
145  return MCDisassembler::Success;
146 }
147 
148 static DecodeStatus DecodesFPR64_VRegisterClass(MCInst &Inst, uint64_t RegNo,
149  uint64_t Address,
150  const MCDisassembler *Decoder) {
151  if (RegNo >= 16)
152  return MCDisassembler::Fail;
153 
154  Inst.addOperand(MCOperand::createReg(FPR64DecoderTable[RegNo]));
155  return MCDisassembler::Success;
156 }
157 
158 static DecodeStatus DecodeFPR64RegisterClass(MCInst &Inst, uint64_t RegNo,
159  uint64_t Address,
160  const MCDisassembler *Decoder) {
161  if (RegNo >= 32)
162  return MCDisassembler::Fail;
163 
164  Inst.addOperand(MCOperand::createReg(FPR64DecoderTable[RegNo]));
165  return MCDisassembler::Success;
166 }
167 
168 // TODO
169 LLVM_ATTRIBUTE_UNUSED
170 static DecodeStatus DecodesFPR128RegisterClass(MCInst &Inst, uint64_t RegNo,
171  uint64_t Address,
172  const MCDisassembler *Decoder) {
173  if (RegNo >= 16)
174  return MCDisassembler::Fail;
175 
176  Inst.addOperand(MCOperand::createReg(FPR128DecoderTable[RegNo]));
177  return MCDisassembler::Success;
178 }
179 
180 static DecodeStatus DecodesGPRRegisterClass(MCInst &Inst, uint64_t RegNo,
181  uint64_t Address,
182  const MCDisassembler *Decoder) {
183  if (RegNo >= 16)
184  return MCDisassembler::Fail;
185 
186  Inst.addOperand(MCOperand::createReg(GPRDecoderTable[RegNo]));
187  return MCDisassembler::Success;
188 }
189 
190 static DecodeStatus DecodemGPRRegisterClass(MCInst &Inst, uint64_t RegNo,
191  uint64_t Address,
192  const MCDisassembler *Decoder) {
193  if (RegNo >= 8)
194  return MCDisassembler::Fail;
195 
196  Inst.addOperand(MCOperand::createReg(GPRDecoderTable[RegNo]));
197  return MCDisassembler::Success;
198 }
199 
200 // TODO
201 LLVM_ATTRIBUTE_UNUSED
202 static DecodeStatus DecodeGPRSPRegisterClass(MCInst &Inst, uint64_t RegNo,
203  uint64_t Address,
204  const MCDisassembler *Decoder) {
205  if (RegNo != 14)
206  return MCDisassembler::Fail;
207 
208  Inst.addOperand(MCOperand::createReg(GPRDecoderTable[RegNo]));
209  return MCDisassembler::Success;
210 }
211 
212 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, uint64_t RegNo,
213  uint64_t Address,
214  const MCDisassembler *Decoder) {
215  const FeatureBitset &FeatureBits =
216  Decoder->getSubtargetInfo().getFeatureBits();
217  bool hasHighReg = FeatureBits[CSKY::FeatureHighreg];
218 
219  if (RegNo >= 32 || (!hasHighReg && RegNo >= 16))
220  return MCDisassembler::Fail;
221 
222  Inst.addOperand(MCOperand::createReg(GPRPairDecoderTable[RegNo]));
223  return MCDisassembler::Success;
224 }
225 
226 template <unsigned N, unsigned S>
227 static DecodeStatus decodeUImmOperand(MCInst &Inst, uint64_t Imm,
228  int64_t Address,
229  const MCDisassembler *Decoder) {
230  assert(isUInt<N>(Imm) && "Invalid immediate");
231  Inst.addOperand(MCOperand::createImm(Imm << S));
232  return MCDisassembler::Success;
233 }
234 
235 template <unsigned N>
236 static DecodeStatus decodeOImmOperand(MCInst &Inst, uint64_t Imm,
237  int64_t Address,
238  const MCDisassembler *Decoder) {
239  assert(isUInt<N>(Imm) && "Invalid immediate");
240  Inst.addOperand(MCOperand::createImm(Imm + 1));
241  return MCDisassembler::Success;
242 }
243 
244 static DecodeStatus decodeLRW16Imm8(MCInst &Inst, uint64_t Imm, int64_t Address,
245  const MCDisassembler *Decoder) {
246  assert(isUInt<8>(Imm) && "Invalid immediate");
247  if ((Imm >> 7) & 0x1) {
248  Inst.addOperand(MCOperand::createImm((Imm & 0x7F) << 2));
249  } else {
250  uint64_t V = ((Imm ^ 0xFFFFFFFF) & 0xFF);
251  Inst.addOperand(MCOperand::createImm(V << 2));
252  }
253 
254  return MCDisassembler::Success;
255 }
256 
257 static DecodeStatus decodeJMPIXImmOperand(MCInst &Inst, uint64_t Imm,
258  int64_t Address,
259  const MCDisassembler *Decoder) {
260  assert(isUInt<2>(Imm) && "Invalid immediate");
261 
262  if (Imm == 0)
263  Inst.addOperand(MCOperand::createImm(16));
264  else if (Imm == 1)
265  Inst.addOperand(MCOperand::createImm(24));
266  else if (Imm == 2)
267  Inst.addOperand(MCOperand::createImm(32));
268  else if (Imm == 3)
269  Inst.addOperand(MCOperand::createImm(40));
270  else
271  return MCDisassembler::Fail;
272 
273  return MCDisassembler::Success;
274 }
275 
276 static DecodeStatus DecodeRegSeqOperand(MCInst &Inst, uint64_t Imm,
277  int64_t Address,
278  const MCDisassembler *Decoder) {
279  assert(isUInt<10>(Imm) && "Invalid immediate");
280 
281  auto Imm5 = Imm & 0x1f;
282  auto Ry = (Imm >> 5) & 0x1f;
283 
284  if (DecodeGPRRegisterClass(Inst, Ry, Address, Decoder) ==
285  MCDisassembler::Fail)
286  return MCDisassembler::Fail;
287 
288  Inst.addOperand(MCOperand::createReg(GPRDecoderTable[Ry + Imm5]));
289 
290  return MCDisassembler::Success;
291 }
292 
293 static DecodeStatus DecodeRegSeqOperandF1(MCInst &Inst, uint64_t Imm,
294  int64_t Address,
295  const MCDisassembler *Decoder) {
296  assert(isUInt<10>(Imm) && "Invalid immediate");
297 
298  auto Imm5 = Imm & 0x1f;
299  auto Ry = (Imm >> 5) & 0x1f;
300 
301  if (DecodesFPR32RegisterClass(Inst, Ry, Address, Decoder) ==
302  MCDisassembler::Fail)
303  return MCDisassembler::Fail;
304 
305  Inst.addOperand(MCOperand::createReg(FPR32DecoderTable[Ry + Imm5]));
306 
307  return MCDisassembler::Success;
308 }
309 
310 static DecodeStatus DecodeRegSeqOperandD1(MCInst &Inst, uint64_t Imm,
311  int64_t Address,
312  const MCDisassembler *Decoder) {
313  assert(isUInt<10>(Imm) && "Invalid immediate");
314 
315  auto Imm5 = Imm & 0x1f;
316  auto Ry = (Imm >> 5) & 0x1f;
317 
318  if (DecodesFPR64RegisterClass(Inst, Ry, Address, Decoder) ==
319  MCDisassembler::Fail)
320  return MCDisassembler::Fail;
321 
322  Inst.addOperand(MCOperand::createReg(FPR64DecoderTable[Ry + Imm5]));
323 
324  return MCDisassembler::Success;
325 }
326 
327 static DecodeStatus DecodeRegSeqOperandF2(MCInst &Inst, uint64_t Imm,
328  int64_t Address,
329  const MCDisassembler *Decoder) {
330  assert(isUInt<10>(Imm) && "Invalid immediate");
331 
332  auto Imm5 = Imm & 0x1f;
333  auto Ry = (Imm >> 5) & 0x1f;
334 
335  if (DecodeFPR32RegisterClass(Inst, Ry, Address, Decoder) ==
336  MCDisassembler::Fail)
337  return MCDisassembler::Fail;
338 
339  Inst.addOperand(MCOperand::createReg(FPR32DecoderTable[Ry + Imm5]));
340 
341  return MCDisassembler::Success;
342 }
343 
344 static DecodeStatus DecodeRegSeqOperandD2(MCInst &Inst, uint64_t Imm,
345  int64_t Address,
346  const MCDisassembler *Decoder) {
347  assert(isUInt<10>(Imm) && "Invalid immediate");
348 
349  auto Imm5 = Imm & 0x1f;
350  auto Ry = (Imm >> 5) & 0x1f;
351 
352  if (DecodeFPR64RegisterClass(Inst, Ry, Address, Decoder) ==
353  MCDisassembler::Fail)
354  return MCDisassembler::Fail;
355 
356  Inst.addOperand(MCOperand::createReg(FPR64DecoderTable[Ry + Imm5]));
357 
358  return MCDisassembler::Success;
359 }
360 
361 static DecodeStatus decodeImmShiftOpValue(MCInst &Inst, uint64_t Imm,
362  int64_t Address,
363  const MCDisassembler *Decoder) {
364  Inst.addOperand(MCOperand::createImm(Log2_64(Imm)));
365  return MCDisassembler::Success;
366 }
367 
368 template <unsigned N, unsigned S>
369 static DecodeStatus decodeSImmOperand(MCInst &Inst, uint64_t Imm,
370  int64_t Address,
371  const MCDisassembler *Decoder) {
372  assert(isUInt<N>(Imm) && "Invalid immediate");
373  // Sign-extend the number in the bottom N bits of Imm
374  Inst.addOperand(MCOperand::createImm(SignExtend64<N>(Imm) << S));
375  return MCDisassembler::Success;
376 }
377 
378 #include "CSKYGenDisassemblerTables.inc"
379 
380 DecodeStatus CSKYDisassembler::handleCROperand(MCInst &MI) const {
381 
382  // FIXME: To query instruction info from td file or a table inc file
383  switch (MI.getOpcode()) {
384  default:
385  return MCDisassembler::Success;
386  case CSKY::LD16WSP:
387  case CSKY::ST16WSP:
388  case CSKY::ADDI16ZSP:
389  MI.insert(std::next(MI.begin()), MCOperand::createReg(CSKY::R14));
390  return MCDisassembler::Success;
391  case CSKY::ADDI16SPSP:
392  case CSKY::SUBI16SPSP:
393  MI.insert(MI.begin(), MCOperand::createReg(CSKY::R14));
394  MI.insert(MI.begin(), MCOperand::createReg(CSKY::R14));
395  return MCDisassembler::Success;
396  case CSKY::FCMPHS_S:
397  case CSKY::FCMPHS_D:
398  case CSKY::FCMPLT_S:
399  case CSKY::FCMPLT_D:
400  case CSKY::FCMPNE_S:
401  case CSKY::FCMPNE_D:
402  case CSKY::FCMPUO_S:
403  case CSKY::FCMPUO_D:
404  case CSKY::FCMPZHS_S:
405  case CSKY::FCMPZHS_D:
406  case CSKY::FCMPZLS_S:
407  case CSKY::FCMPZLS_D:
408  case CSKY::FCMPZNE_S:
409  case CSKY::FCMPZNE_D:
410  case CSKY::FCMPZUO_S:
411  case CSKY::FCMPZUO_D:
412  case CSKY::f2FCMPHS_S:
413  case CSKY::f2FCMPHS_D:
414  case CSKY::f2FCMPLT_S:
415  case CSKY::f2FCMPLT_D:
416  case CSKY::f2FCMPNE_S:
417  case CSKY::f2FCMPNE_D:
418  case CSKY::f2FCMPUO_S:
419  case CSKY::f2FCMPUO_D:
420  case CSKY::f2FCMPHSZ_S:
421  case CSKY::f2FCMPHSZ_D:
422  case CSKY::f2FCMPHZ_S:
423  case CSKY::f2FCMPHZ_D:
424  case CSKY::f2FCMPLSZ_S:
425  case CSKY::f2FCMPLSZ_D:
426  case CSKY::f2FCMPLTZ_S:
427  case CSKY::f2FCMPLTZ_D:
428  case CSKY::f2FCMPNEZ_S:
429  case CSKY::f2FCMPNEZ_D:
430  case CSKY::f2FCMPUOZ_S:
431  case CSKY::f2FCMPUOZ_D:
432 
433  case CSKY::BT32:
434  case CSKY::BF32:
435  case CSKY::BT16:
436  case CSKY::BF16:
437  case CSKY::CMPNEI32:
438  case CSKY::CMPNEI16:
439  case CSKY::CMPNE32:
440  case CSKY::CMPNE16:
441  case CSKY::CMPHSI32:
442  case CSKY::CMPHSI16:
443  case CSKY::CMPHS32:
444  case CSKY::CMPHS16:
445  case CSKY::CMPLTI32:
446  case CSKY::CMPLTI16:
447  case CSKY::CMPLT32:
448  case CSKY::CMPLT16:
449  case CSKY::BTSTI32:
450  case CSKY::BTSTI16:
451  case CSKY::TSTNBZ32:
452  case CSKY::TSTNBZ16:
453  case CSKY::TST32:
454  case CSKY::TST16:
455  MI.insert(MI.begin(), MCOperand::createReg(CSKY::C));
456  return MCDisassembler::Success;
457  case CSKY::LSLC32:
458  case CSKY::LSRC32:
459  case CSKY::ASRC32:
460  MI.insert(std::next(MI.begin()), MCOperand::createReg(CSKY::C));
461  return MCDisassembler::Success;
462  case CSKY::MOVF32:
463  case CSKY::MOVT32:
464  case CSKY::MVC32:
465  case CSKY::MVCV32:
466  case CSKY::MVCV16:
467  case CSKY::INCT32:
468  case CSKY::INCF32:
469  case CSKY::DECT32:
470  case CSKY::DECF32:
471  case CSKY::DECGT32:
472  case CSKY::DECLT32:
473  case CSKY::DECNE32:
474  case CSKY::CLRF32:
475  case CSKY::CLRT32:
476  case CSKY::f2FSEL_S:
477  case CSKY::f2FSEL_D:
478  MI.insert(std::next(MI.begin()), MCOperand::createReg(CSKY::C));
479  return MCDisassembler::Success;
480  case CSKY::ADDC32:
481  case CSKY::ADDC16:
482  case CSKY::SUBC32:
483  case CSKY::SUBC16:
484  case CSKY::XSR32:
485  MI.insert(std::next(MI.begin()), MCOperand::createReg(CSKY::C));
486  MI.insert(MI.end(), MCOperand::createReg(CSKY::C));
487  return MCDisassembler::Success;
488  case CSKY::INS32:
489  MI.getOperand(3).setImm(MI.getOperand(3).getImm() +
490  MI.getOperand(4).getImm());
491  return MCDisassembler::Success;
492  }
493 }
494 
495 static bool decodeFPUV3Instruction(MCInst &MI, uint32_t insn, uint64_t Address,
496  const MCDisassembler *DisAsm,
497  const MCSubtargetInfo &STI) {
498  LLVM_DEBUG(dbgs() << "Trying CSKY 32-bit fpuv3 table :\n");
499  if (!STI.getFeatureBits()[CSKY::FeatureFPUV3_HF] &&
500  !STI.getFeatureBits()[CSKY::FeatureFPUV3_SF] &&
501  !STI.getFeatureBits()[CSKY::FeatureFPUV3_DF])
502  return false;
503 
504  DecodeStatus Result =
505  decodeInstruction(DecoderTableFPUV332, MI, insn, Address, DisAsm, STI);
506 
507  if (Result == MCDisassembler::Fail) {
508  MI.clear();
509  return false;
510  }
511 
512  return true;
513 }
514 
515 DecodeStatus CSKYDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
516  ArrayRef<uint8_t> Bytes,
517  uint64_t Address,
518  raw_ostream &CS) const {
519 
520  uint32_t Insn;
521  DecodeStatus Result = MCDisassembler::Fail;
522 
523  Insn = support::endian::read16le(Bytes.data());
524 
525  if ((Insn >> 14) == 0x3) {
526  if (Bytes.size() < 4) {
527  Size = 0;
528  return MCDisassembler::Fail;
529  }
530  Insn = (Insn << 16) | support::endian::read16le(&Bytes[2]);
531 
532  if (decodeFPUV3Instruction(MI, Insn, Address, this, STI))
533  Result = MCDisassembler::Success;
534  else {
535  LLVM_DEBUG(dbgs() << "Trying CSKY 32-bit table :\n");
536  Result = decodeInstruction(DecoderTable32, MI, Insn, Address, this, STI);
537  }
538 
539  Size = 4;
540  } else {
541  if (Bytes.size() < 2) {
542  Size = 0;
543  return MCDisassembler::Fail;
544  }
545  LLVM_DEBUG(dbgs() << "Trying CSKY 16-bit table :\n");
546  Result = decodeInstruction(DecoderTable16, MI, Insn, Address, this, STI);
547  Size = 2;
548  }
549 
550  handleCROperand(MI);
551 
552  return Result;
553 }
llvm::Check::Size
@ Size
Definition: FileCheck.h:77
DecodeRegSeqOperandD1
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Definition: IRTranslator.cpp:109
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Definition: MCInst.h:210
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Definition: StringRef.h:50
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