LLVM 19.0.0git
ARMMCCodeEmitter.cpp
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1//===-- ARM/ARMMCCodeEmitter.cpp - Convert ARM code to machine code -------===//
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 ARMMCCodeEmitter class.
10//
11//===----------------------------------------------------------------------===//
12
17#include "llvm/ADT/APFloat.h"
18#include "llvm/ADT/APInt.h"
20#include "llvm/ADT/Statistic.h"
22#include "llvm/MC/MCContext.h"
23#include "llvm/MC/MCExpr.h"
24#include "llvm/MC/MCFixup.h"
25#include "llvm/MC/MCInst.h"
26#include "llvm/MC/MCInstrDesc.h"
27#include "llvm/MC/MCInstrInfo.h"
37#include <algorithm>
38#include <cassert>
39#include <cstdint>
40#include <cstdlib>
41
42using namespace llvm;
43
44#define DEBUG_TYPE "mccodeemitter"
45
46STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
47STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
48
49namespace {
50
51class ARMMCCodeEmitter : public MCCodeEmitter {
52 const MCInstrInfo &MCII;
53 MCContext &CTX;
54 bool IsLittleEndian;
55
56public:
57 ARMMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx, bool IsLittle)
58 : MCII(mcii), CTX(ctx), IsLittleEndian(IsLittle) {
59 }
60 ARMMCCodeEmitter(const ARMMCCodeEmitter &) = delete;
61 ARMMCCodeEmitter &operator=(const ARMMCCodeEmitter &) = delete;
62 ~ARMMCCodeEmitter() override = default;
63
64 bool isThumb(const MCSubtargetInfo &STI) const {
65 return STI.hasFeature(ARM::ModeThumb);
66 }
67
68 bool isThumb2(const MCSubtargetInfo &STI) const {
69 return isThumb(STI) && STI.hasFeature(ARM::FeatureThumb2);
70 }
71
72 bool isTargetMachO(const MCSubtargetInfo &STI) const {
73 const Triple &TT = STI.getTargetTriple();
74 return TT.isOSBinFormatMachO();
75 }
76
77 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
78
79 // getBinaryCodeForInstr - TableGen'erated function for getting the
80 // binary encoding for an instruction.
81 uint64_t getBinaryCodeForInstr(const MCInst &MI,
83 const MCSubtargetInfo &STI) const;
84
85 /// getMachineOpValue - Return binary encoding of operand. If the machine
86 /// operand requires relocation, record the relocation and return zero.
87 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
89 const MCSubtargetInfo &STI) const;
90
91 /// getHiLoImmOpValue - Return the encoding for either the hi / low 16-bit, or
92 /// high/middle-high/middle-low/low 8 bits of the specified operand. This is
93 /// used for operands with :lower16:, :upper16: :lower0_7:, :lower8_15:,
94 /// :higher0_7:, and :higher8_15: prefixes.
95 uint32_t getHiLoImmOpValue(const MCInst &MI, unsigned OpIdx,
97 const MCSubtargetInfo &STI) const;
98
99 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
100 unsigned &Reg, unsigned &Imm,
102 const MCSubtargetInfo &STI) const;
103
104 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
105 /// BL branch target.
106 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
108 const MCSubtargetInfo &STI) const;
109
110 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
111 /// BLX branch target.
112 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
114 const MCSubtargetInfo &STI) const;
115
116 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
117 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
119 const MCSubtargetInfo &STI) const;
120
121 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
122 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
124 const MCSubtargetInfo &STI) const;
125
126 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
127 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
129 const MCSubtargetInfo &STI) const;
130
131 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
132 /// branch target.
133 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
135 const MCSubtargetInfo &STI) const;
136
137 /// getThumbBranchTargetOpValue - Return encoding info for 24-bit
138 /// immediate Thumb2 direct branch target.
139 uint32_t getThumbBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
141 const MCSubtargetInfo &STI) const;
142
143 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
144 /// branch target.
145 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
147 const MCSubtargetInfo &STI) const;
148 uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
150 const MCSubtargetInfo &STI) const;
151 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
153 const MCSubtargetInfo &STI) const;
154
155 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
156 /// ADR label target.
157 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
159 const MCSubtargetInfo &STI) const;
160 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
162 const MCSubtargetInfo &STI) const;
163 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
165 const MCSubtargetInfo &STI) const;
166
167 uint32_t getITMaskOpValue(const MCInst &MI, unsigned OpIdx,
169 const MCSubtargetInfo &STI) const;
170
171 /// getMVEShiftImmOpValue - Return encoding info for the 'sz:imm5'
172 /// operand.
173 uint32_t getMVEShiftImmOpValue(const MCInst &MI, unsigned OpIdx,
175 const MCSubtargetInfo &STI) const;
176
177 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
178 /// operand.
179 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
181 const MCSubtargetInfo &STI) const;
182
183 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
184 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
186 const MCSubtargetInfo &STI) const;
187
188 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
189 /// operand.
190 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
192 const MCSubtargetInfo &STI) const;
193
194 /// getT2AddrModeImm7s4OpValue - Return encoding info for 'reg +/- imm7<<2'
195 /// operand.
196 uint32_t getT2AddrModeImm7s4OpValue(const MCInst &MI, unsigned OpIdx,
198 const MCSubtargetInfo &STI) const;
199
200 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2'
201 /// operand.
202 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
204 const MCSubtargetInfo &STI) const;
205
206 /// getT2ScaledImmOpValue - Return encoding info for '+/- immX<<Y'
207 /// operand.
208 template<unsigned Bits, unsigned Shift>
209 uint32_t getT2ScaledImmOpValue(const MCInst &MI, unsigned OpIdx,
211 const MCSubtargetInfo &STI) const;
212
213 /// getMveAddrModeRQOpValue - Return encoding info for 'reg, vreg'
214 /// operand.
215 uint32_t getMveAddrModeRQOpValue(const MCInst &MI, unsigned OpIdx,
217 const MCSubtargetInfo &STI) const;
218
219 /// getMveAddrModeQOpValue - Return encoding info for 'reg +/- imm7<<{shift}'
220 /// operand.
221 template<int shift>
222 uint32_t getMveAddrModeQOpValue(const MCInst &MI, unsigned OpIdx,
224 const MCSubtargetInfo &STI) const;
225
226 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
227 /// operand as needed by load/store instructions.
228 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
230 const MCSubtargetInfo &STI) const;
231
232 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
233 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
235 const MCSubtargetInfo &STI) const {
236 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
237 switch (Mode) {
238 default: llvm_unreachable("Unknown addressing sub-mode!");
239 case ARM_AM::da: return 0;
240 case ARM_AM::ia: return 1;
241 case ARM_AM::db: return 2;
242 case ARM_AM::ib: return 3;
243 }
244 }
245
246 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
247 ///
248 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
249 switch (ShOpc) {
250 case ARM_AM::no_shift:
251 case ARM_AM::lsl: return 0;
252 case ARM_AM::lsr: return 1;
253 case ARM_AM::asr: return 2;
254 case ARM_AM::ror:
255 case ARM_AM::rrx: return 3;
256 default:
257 llvm_unreachable("Invalid ShiftOpc!");
258 }
259 }
260
261 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
262 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
264 const MCSubtargetInfo &STI) const;
265
266 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
267 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
269 const MCSubtargetInfo &STI) const;
270
271 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
272 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
274 const MCSubtargetInfo &STI) const;
275
276 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
277 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
279 const MCSubtargetInfo &STI) const;
280
281 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
282 /// operand.
283 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
285 const MCSubtargetInfo &STI) const;
286
287 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
288 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
290 const MCSubtargetInfo &STI) const;
291
292 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
293 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
295 const MCSubtargetInfo &STI) const;
296
297 /// getAddrMode5OpValue - Return encoding info for 'reg +/- (imm8 << 2)' operand.
298 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
300 const MCSubtargetInfo &STI) const;
301
302 /// getAddrMode5FP16OpValue - Return encoding info for 'reg +/- (imm8 << 1)' operand.
303 uint32_t getAddrMode5FP16OpValue(const MCInst &MI, unsigned OpIdx,
305 const MCSubtargetInfo &STI) const;
306
307 /// getCCOutOpValue - Return encoding of the 's' bit.
308 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
310 const MCSubtargetInfo &STI) const {
311 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
312 // '1' respectively.
313 return MI.getOperand(Op).getReg() == ARM::CPSR;
314 }
315
316 unsigned getModImmOpValue(const MCInst &MI, unsigned Op,
318 const MCSubtargetInfo &ST) const {
319 const MCOperand &MO = MI.getOperand(Op);
320
321 // Support for fixups (MCFixup)
322 if (MO.isExpr()) {
323 const MCExpr *Expr = MO.getExpr();
324 // Fixups resolve to plain values that need to be encoded.
326 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
327 return 0;
328 }
329
330 // Immediate is already in its encoded format
331 return MO.getImm();
332 }
333
334 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
335 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
337 const MCSubtargetInfo &STI) const {
338 const MCOperand &MO = MI.getOperand(Op);
339
340 // Support for fixups (MCFixup)
341 if (MO.isExpr()) {
342 const MCExpr *Expr = MO.getExpr();
343 // Fixups resolve to plain values that need to be encoded.
345 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
346 return 0;
347 }
348 unsigned SoImm = MO.getImm();
349 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
350 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
351 return Encoded;
352 }
353
354 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
356 const MCSubtargetInfo &STI) const;
357 template<unsigned Bits, unsigned Shift>
358 unsigned getT2AddrModeImmOpValue(const MCInst &MI, unsigned OpNum,
360 const MCSubtargetInfo &STI) const;
361 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
363 const MCSubtargetInfo &STI) const;
364
365 /// getSORegOpValue - Return an encoded so_reg shifted register value.
366 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
368 const MCSubtargetInfo &STI) const;
369 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
371 const MCSubtargetInfo &STI) const;
372 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
374 const MCSubtargetInfo &STI) const;
375
376 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
378 const MCSubtargetInfo &STI) const {
379 return 64 - MI.getOperand(Op).getImm();
380 }
381
382 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
384 const MCSubtargetInfo &STI) const;
385
386 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
388 const MCSubtargetInfo &STI) const;
389 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
391 const MCSubtargetInfo &STI) const;
392 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
394 const MCSubtargetInfo &STI) const;
395 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
397 const MCSubtargetInfo &STI) const;
398 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
400 const MCSubtargetInfo &STI) const;
401
402 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
404 const MCSubtargetInfo &STI) const;
405 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
407 const MCSubtargetInfo &STI) const;
408 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
410 const MCSubtargetInfo &STI) const;
411 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
413 const MCSubtargetInfo &STI) const;
414
415 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
417 const MCSubtargetInfo &STI) const;
418
419 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
420 unsigned EncodedValue,
421 const MCSubtargetInfo &STI) const;
422 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
423 unsigned EncodedValue,
424 const MCSubtargetInfo &STI) const;
425 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
426 unsigned EncodedValue,
427 const MCSubtargetInfo &STI) const;
428 unsigned NEONThumb2V8PostEncoder(const MCInst &MI,
429 unsigned EncodedValue,
430 const MCSubtargetInfo &STI) const;
431
432 unsigned VFPThumb2PostEncoder(const MCInst &MI,
433 unsigned EncodedValue,
434 const MCSubtargetInfo &STI) const;
435
436 uint32_t getPowerTwoOpValue(const MCInst &MI, unsigned OpIdx,
438 const MCSubtargetInfo &STI) const;
439
442 const MCSubtargetInfo &STI) const override;
443
444 template <bool isNeg, ARM::Fixups fixup>
445 uint32_t getBFTargetOpValue(const MCInst &MI, unsigned OpIdx,
447 const MCSubtargetInfo &STI) const;
448
449 uint32_t getBFAfterTargetOpValue(const MCInst &MI, unsigned OpIdx,
451 const MCSubtargetInfo &STI) const;
452
453 uint32_t getVPTMaskOpValue(const MCInst &MI, unsigned OpIdx,
455 const MCSubtargetInfo &STI) const;
456 uint32_t getRestrictedCondCodeOpValue(const MCInst &MI, unsigned OpIdx,
458 const MCSubtargetInfo &STI) const;
459 template <unsigned size>
460 uint32_t getMVEPairVectorIndexOpValue(const MCInst &MI, unsigned OpIdx,
462 const MCSubtargetInfo &STI) const;
463};
464
465} // end anonymous namespace
466
467/// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
468/// instructions, and rewrite them to their Thumb2 form if we are currently in
469/// Thumb2 mode.
470unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
471 unsigned EncodedValue,
472 const MCSubtargetInfo &STI) const {
473 if (isThumb2(STI)) {
474 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
475 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
476 // set to 1111.
477 unsigned Bit24 = EncodedValue & 0x01000000;
478 unsigned Bit28 = Bit24 << 4;
479 EncodedValue &= 0xEFFFFFFF;
480 EncodedValue |= Bit28;
481 EncodedValue |= 0x0F000000;
482 }
483
484 return EncodedValue;
485}
486
487/// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
488/// instructions, and rewrite them to their Thumb2 form if we are currently in
489/// Thumb2 mode.
490unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
491 unsigned EncodedValue,
492 const MCSubtargetInfo &STI) const {
493 if (isThumb2(STI)) {
494 EncodedValue &= 0xF0FFFFFF;
495 EncodedValue |= 0x09000000;
496 }
497
498 return EncodedValue;
499}
500
501/// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
502/// instructions, and rewrite them to their Thumb2 form if we are currently in
503/// Thumb2 mode.
504unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
505 unsigned EncodedValue,
506 const MCSubtargetInfo &STI) const {
507 if (isThumb2(STI)) {
508 EncodedValue &= 0x00FFFFFF;
509 EncodedValue |= 0xEE000000;
510 }
511
512 return EncodedValue;
513}
514
515/// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form
516/// if we are in Thumb2.
517unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI,
518 unsigned EncodedValue,
519 const MCSubtargetInfo &STI) const {
520 if (isThumb2(STI)) {
521 EncodedValue |= 0xC000000; // Set bits 27-26
522 }
523
524 return EncodedValue;
525}
526
527/// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
528/// them to their Thumb2 form if we are currently in Thumb2 mode.
529unsigned ARMMCCodeEmitter::
530VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue,
531 const MCSubtargetInfo &STI) const {
532 if (isThumb2(STI)) {
533 EncodedValue &= 0x0FFFFFFF;
534 EncodedValue |= 0xE0000000;
535 }
536 return EncodedValue;
537}
538
539/// getMachineOpValue - Return binary encoding of operand. If the machine
540/// operand requires relocation, record the relocation and return zero.
541unsigned ARMMCCodeEmitter::
542getMachineOpValue(const MCInst &MI, const MCOperand &MO,
544 const MCSubtargetInfo &STI) const {
545 if (MO.isReg()) {
546 unsigned Reg = MO.getReg();
547 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
548
549 // In NEON, Q registers are encoded as 2x their register number,
550 // because they're using the same indices as the D registers they
551 // overlap. In MVE, there are no 64-bit vector instructions, so
552 // the encodings all refer to Q-registers by their literal
553 // register number.
554
555 if (STI.hasFeature(ARM::HasMVEIntegerOps))
556 return RegNo;
557
558 switch (Reg) {
559 default:
560 return RegNo;
561 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
562 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
563 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
564 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
565 return 2 * RegNo;
566 }
567 } else if (MO.isImm()) {
568 return static_cast<unsigned>(MO.getImm());
569 } else if (MO.isDFPImm()) {
570 return static_cast<unsigned>(APFloat(bit_cast<double>(MO.getDFPImm()))
572 .getHiBits(32)
573 .getLimitedValue());
574 }
575
576 llvm_unreachable("Unable to encode MCOperand!");
577}
578
579/// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
580bool ARMMCCodeEmitter::
581EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
582 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups,
583 const MCSubtargetInfo &STI) const {
584 const MCOperand &MO = MI.getOperand(OpIdx);
585 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
586
588
589 int32_t SImm = MO1.getImm();
590 bool isAdd = true;
591
592 // Special value for #-0
593 if (SImm == INT32_MIN) {
594 SImm = 0;
595 isAdd = false;
596 }
597
598 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
599 if (SImm < 0) {
600 SImm = -SImm;
601 isAdd = false;
602 }
603
604 Imm = SImm;
605 return isAdd;
606}
607
608/// getBranchTargetOpValue - Helper function to get the branch target operand,
609/// which is either an immediate or requires a fixup.
610static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
611 unsigned FixupKind,
613 const MCSubtargetInfo &STI) {
614 const MCOperand &MO = MI.getOperand(OpIdx);
615
616 // If the destination is an immediate, we have nothing to do.
617 if (MO.isImm()) return MO.getImm();
618 assert(MO.isExpr() && "Unexpected branch target type!");
619 const MCExpr *Expr = MO.getExpr();
620 MCFixupKind Kind = MCFixupKind(FixupKind);
621 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
622
623 // All of the information is in the fixup.
624 return 0;
625}
626
627// Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
628// determined by negating them and XOR'ing them with bit 23.
629static int32_t encodeThumbBLOffset(int32_t offset) {
630 offset >>= 1;
631 uint32_t S = (offset & 0x800000) >> 23;
632 uint32_t J1 = (offset & 0x400000) >> 22;
633 uint32_t J2 = (offset & 0x200000) >> 21;
634 J1 = (~J1 & 0x1);
635 J2 = (~J2 & 0x1);
636 J1 ^= S;
637 J2 ^= S;
638
639 offset &= ~0x600000;
640 offset |= J1 << 22;
641 offset |= J2 << 21;
642
643 return offset;
644}
645
646/// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
647uint32_t ARMMCCodeEmitter::
648getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
650 const MCSubtargetInfo &STI) const {
651 const MCOperand MO = MI.getOperand(OpIdx);
652 if (MO.isExpr())
653 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
654 Fixups, STI);
655 return encodeThumbBLOffset(MO.getImm());
656}
657
658/// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
659/// BLX branch target.
660uint32_t ARMMCCodeEmitter::
661getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
663 const MCSubtargetInfo &STI) const {
664 const MCOperand MO = MI.getOperand(OpIdx);
665 if (MO.isExpr())
666 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
667 Fixups, STI);
668 return encodeThumbBLOffset(MO.getImm());
669}
670
671/// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
672uint32_t ARMMCCodeEmitter::
673getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
675 const MCSubtargetInfo &STI) const {
676 const MCOperand MO = MI.getOperand(OpIdx);
677 if (MO.isExpr())
678 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
679 Fixups, STI);
680 return (MO.getImm() >> 1);
681}
682
683/// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
684uint32_t ARMMCCodeEmitter::
685getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
687 const MCSubtargetInfo &STI) const {
688 const MCOperand MO = MI.getOperand(OpIdx);
689 if (MO.isExpr())
690 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
691 Fixups, STI);
692 return (MO.getImm() >> 1);
693}
694
695/// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
696uint32_t ARMMCCodeEmitter::
697getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
699 const MCSubtargetInfo &STI) const {
700 const MCOperand MO = MI.getOperand(OpIdx);
701 if (MO.isExpr())
702 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups, STI);
703 return (MO.getImm() >> 1);
704}
705
706/// Return true if this branch has a non-always predication
707static bool HasConditionalBranch(const MCInst &MI) {
708 int NumOp = MI.getNumOperands();
709 if (NumOp >= 2) {
710 for (int i = 0; i < NumOp-1; ++i) {
711 const MCOperand &MCOp1 = MI.getOperand(i);
712 const MCOperand &MCOp2 = MI.getOperand(i + 1);
713 if (MCOp1.isImm() && MCOp2.isReg() &&
714 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
715 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
716 return true;
717 }
718 }
719 }
720 return false;
721}
722
723/// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
724/// target.
725uint32_t ARMMCCodeEmitter::
726getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
728 const MCSubtargetInfo &STI) const {
729 // FIXME: This really, really shouldn't use TargetMachine. We don't want
730 // coupling between MC and TM anywhere we can help it.
731 if (isThumb2(STI))
732 return
733 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups, STI);
734 return getARMBranchTargetOpValue(MI, OpIdx, Fixups, STI);
735}
736
737/// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
738/// target.
739uint32_t ARMMCCodeEmitter::
740getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
742 const MCSubtargetInfo &STI) const {
743 const MCOperand MO = MI.getOperand(OpIdx);
744 if (MO.isExpr()) {
746 return ::getBranchTargetOpValue(MI, OpIdx,
747 ARM::fixup_arm_condbranch, Fixups, STI);
748 return ::getBranchTargetOpValue(MI, OpIdx,
749 ARM::fixup_arm_uncondbranch, Fixups, STI);
750 }
751
752 return MO.getImm() >> 2;
753}
754
755uint32_t ARMMCCodeEmitter::
756getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
758 const MCSubtargetInfo &STI) const {
759 const MCOperand MO = MI.getOperand(OpIdx);
760 if (MO.isExpr()) {
762 return ::getBranchTargetOpValue(MI, OpIdx,
763 ARM::fixup_arm_condbl, Fixups, STI);
764 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups, STI);
765 }
766
767 return MO.getImm() >> 2;
768}
769
770uint32_t ARMMCCodeEmitter::
771getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
773 const MCSubtargetInfo &STI) const {
774 const MCOperand MO = MI.getOperand(OpIdx);
775 if (MO.isExpr())
776 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups, STI);
777
778 return MO.getImm() >> 1;
779}
780
781/// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
782/// immediate branch target.
783uint32_t ARMMCCodeEmitter::getThumbBranchTargetOpValue(
784 const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,
785 const MCSubtargetInfo &STI) const {
786 unsigned Val = 0;
787 const MCOperand MO = MI.getOperand(OpIdx);
788
789 if(MO.isExpr())
790 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups, STI);
791 else
792 Val = MO.getImm() >> 1;
793
794 bool I = (Val & 0x800000);
795 bool J1 = (Val & 0x400000);
796 bool J2 = (Val & 0x200000);
797 if (I ^ J1)
798 Val &= ~0x400000;
799 else
800 Val |= 0x400000;
801
802 if (I ^ J2)
803 Val &= ~0x200000;
804 else
805 Val |= 0x200000;
806
807 return Val;
808}
809
810/// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate
811/// ADR label target.
812uint32_t ARMMCCodeEmitter::
813getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
815 const MCSubtargetInfo &STI) const {
816 const MCOperand MO = MI.getOperand(OpIdx);
817 if (MO.isExpr())
818 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
819 Fixups, STI);
820 int64_t offset = MO.getImm();
821 uint32_t Val = 0x2000;
822
823 int SoImmVal;
824 if (offset == INT32_MIN) {
825 Val = 0x1000;
826 SoImmVal = 0;
827 } else if (offset < 0) {
828 Val = 0x1000;
829 offset *= -1;
830 SoImmVal = ARM_AM::getSOImmVal(offset);
831 if(SoImmVal == -1) {
832 Val = 0x2000;
833 offset *= -1;
834 SoImmVal = ARM_AM::getSOImmVal(offset);
835 }
836 } else {
837 SoImmVal = ARM_AM::getSOImmVal(offset);
838 if(SoImmVal == -1) {
839 Val = 0x1000;
840 offset *= -1;
841 SoImmVal = ARM_AM::getSOImmVal(offset);
842 }
843 }
844
845 assert(SoImmVal != -1 && "Not a valid so_imm value!");
846
847 Val |= SoImmVal;
848 return Val;
849}
850
851/// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
852/// target.
853uint32_t ARMMCCodeEmitter::
854getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
856 const MCSubtargetInfo &STI) const {
857 const MCOperand MO = MI.getOperand(OpIdx);
858 if (MO.isExpr())
859 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
860 Fixups, STI);
861 int32_t Val = MO.getImm();
862 if (Val == INT32_MIN)
863 Val = 0x1000;
864 else if (Val < 0) {
865 Val *= -1;
866 Val |= 0x1000;
867 }
868 return Val;
869}
870
871/// getITMaskOpValue - Return the architectural encoding of an IT
872/// predication mask, given the MCOperand format.
873uint32_t ARMMCCodeEmitter::
874getITMaskOpValue(const MCInst &MI, unsigned OpIdx,
876 const MCSubtargetInfo &STI) const {
877 const MCOperand MaskMO = MI.getOperand(OpIdx);
878 assert(MaskMO.isImm() && "Unexpected operand type!");
879
880 unsigned Mask = MaskMO.getImm();
881
882 // IT masks are encoded as a sequence of replacement low-order bits
883 // for the condition code. So if the low bit of the starting
884 // condition code is 1, then we have to flip all the bits above the
885 // terminating bit (which is the lowest 1 bit).
886 assert(OpIdx > 0 && "IT mask appears first!");
887 const MCOperand CondMO = MI.getOperand(OpIdx-1);
888 assert(CondMO.isImm() && "Unexpected operand type!");
889 if (CondMO.getImm() & 1) {
890 unsigned LowBit = Mask & -Mask;
891 unsigned BitsAboveLowBit = 0xF & (-LowBit << 1);
892 Mask ^= BitsAboveLowBit;
893 }
894
895 return Mask;
896}
897
898/// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
899/// target.
900uint32_t ARMMCCodeEmitter::
901getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
903 const MCSubtargetInfo &STI) const {
904 const MCOperand MO = MI.getOperand(OpIdx);
905 if (MO.isExpr())
906 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
907 Fixups, STI);
908 return MO.getImm();
909}
910
911/// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
912/// operand.
913uint32_t ARMMCCodeEmitter::
914getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
916 const MCSubtargetInfo &STI) const {
917 // [Rn, Rm]
918 // {5-3} = Rm
919 // {2-0} = Rn
920 const MCOperand &MO1 = MI.getOperand(OpIdx);
921 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
922 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
923 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
924 return (Rm << 3) | Rn;
925}
926
927/// getMVEShiftImmOpValue - Return encoding info for the 'sz:imm5'
928/// operand.
930ARMMCCodeEmitter::getMVEShiftImmOpValue(const MCInst &MI, unsigned OpIdx,
932 const MCSubtargetInfo &STI) const {
933 // {4-0} = szimm5
934 // The value we are trying to encode is an immediate between either the
935 // range of [1-7] or [1-15] depending on whether we are dealing with the
936 // u8/s8 or the u16/s16 variants respectively.
937 // This value is encoded as follows, if ShiftImm is the value within those
938 // ranges then the encoding szimm5 = ShiftImm + size, where size is either 8
939 // or 16.
940
941 unsigned Size, ShiftImm;
942 switch(MI.getOpcode()) {
943 case ARM::MVE_VSHLL_imms16bh:
944 case ARM::MVE_VSHLL_imms16th:
945 case ARM::MVE_VSHLL_immu16bh:
946 case ARM::MVE_VSHLL_immu16th:
947 Size = 16;
948 break;
949 case ARM::MVE_VSHLL_imms8bh:
950 case ARM::MVE_VSHLL_imms8th:
951 case ARM::MVE_VSHLL_immu8bh:
952 case ARM::MVE_VSHLL_immu8th:
953 Size = 8;
954 break;
955 default:
956 llvm_unreachable("Use of operand not supported by this instruction");
957 }
958 ShiftImm = MI.getOperand(OpIdx).getImm();
959 return Size + ShiftImm;
960}
961
962/// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
963uint32_t ARMMCCodeEmitter::
964getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
966 const MCSubtargetInfo &STI) const {
967 // {17-13} = reg
968 // {12} = (U)nsigned (add == '1', sub == '0')
969 // {11-0} = imm12
970 unsigned Reg = 0, Imm12 = 0;
971 bool isAdd = true;
972 // If The first operand isn't a register, we have a label reference.
973 const MCOperand &MO = MI.getOperand(OpIdx);
974 if (MO.isReg()) {
975 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
976 if (MO1.isImm()) {
977 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups, STI);
978 } else if (MO1.isExpr()) {
979 assert(!isThumb(STI) && !isThumb2(STI) &&
980 "Thumb mode requires different encoding");
982 isAdd = false; // 'U' bit is set as part of the fixup.
984 Fixups.push_back(MCFixup::create(0, MO1.getExpr(), Kind, MI.getLoc()));
985 }
986 } else if (MO.isExpr()) {
987 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
988 isAdd = false; // 'U' bit is set as part of the fixup.
990 if (isThumb2(STI))
992 else
994 Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc()));
995
996 ++MCNumCPRelocations;
997 } else {
998 Reg = ARM::PC;
999 int32_t Offset = MO.getImm();
1000 if (Offset == INT32_MIN) {
1001 Offset = 0;
1002 isAdd = false;
1003 } else if (Offset < 0) {
1004 Offset *= -1;
1005 isAdd = false;
1006 }
1007 Imm12 = Offset;
1008 }
1009 uint32_t Binary = Imm12 & 0xfff;
1010 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1011 if (isAdd)
1012 Binary |= (1 << 12);
1013 Binary |= (Reg << 13);
1014 return Binary;
1015}
1016
1017template<unsigned Bits, unsigned Shift>
1018uint32_t ARMMCCodeEmitter::
1019getT2ScaledImmOpValue(const MCInst &MI, unsigned OpIdx,
1021 const MCSubtargetInfo &STI) const {
1022 // FIXME: The immediate operand should have already been encoded like this
1023 // before ever getting here. The encoder method should just need to combine
1024 // the MI operands for the register and the offset into a single
1025 // representation for the complex operand in the .td file. This isn't just
1026 // style, unfortunately. As-is, we can't represent the distinct encoding
1027 // for #-0.
1028
1029 // {Bits} = (U)nsigned (add == '1', sub == '0')
1030 // {(Bits-1)-0} = immediate
1031 int32_t Imm = MI.getOperand(OpIdx).getImm();
1032 bool isAdd = Imm >= 0;
1033
1034 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1035 if (Imm < 0)
1036 Imm = -(uint32_t)Imm;
1037
1038 Imm >>= Shift;
1039
1040 uint32_t Binary = Imm & ((1U << Bits) - 1);
1041 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1042 if (isAdd)
1043 Binary |= (1U << Bits);
1044 return Binary;
1045}
1046
1047/// getMveAddrModeRQOpValue - Return encoding info for 'reg, vreg'
1048/// operand.
1049uint32_t ARMMCCodeEmitter::
1050getMveAddrModeRQOpValue(const MCInst &MI, unsigned OpIdx,
1052 const MCSubtargetInfo &STI) const {
1053 // {6-3} Rn
1054 // {2-0} Qm
1055 const MCOperand &M0 = MI.getOperand(OpIdx);
1056 const MCOperand &M1 = MI.getOperand(OpIdx + 1);
1057
1058 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(M0.getReg());
1059 unsigned Qm = CTX.getRegisterInfo()->getEncodingValue(M1.getReg());
1060
1061 assert(Qm < 8 && "Qm is supposed to be encodable in 3 bits");
1062
1063 return (Rn << 3) | Qm;
1064}
1065
1066/// getMveAddrModeRQOpValue - Return encoding info for 'reg, vreg'
1067/// operand.
1068template<int shift>
1069uint32_t ARMMCCodeEmitter::
1070getMveAddrModeQOpValue(const MCInst &MI, unsigned OpIdx,
1072 const MCSubtargetInfo &STI) const {
1073 // {10-8} Qm
1074 // {7-0} Imm
1075 const MCOperand &M0 = MI.getOperand(OpIdx);
1076 const MCOperand &M1 = MI.getOperand(OpIdx + 1);
1077
1078 unsigned Qm = CTX.getRegisterInfo()->getEncodingValue(M0.getReg());
1079 int32_t Imm = M1.getImm();
1080
1081 bool isAdd = Imm >= 0;
1082
1083 Imm >>= shift;
1084
1085 if (!isAdd)
1086 Imm = -(uint32_t)Imm;
1087
1088 Imm &= 0x7f;
1089
1090 if (isAdd)
1091 Imm |= 0x80;
1092
1093 assert(Qm < 8 && "Qm is supposed to be encodable in 3 bits");
1094
1095 return (Qm << 8) | Imm;
1096}
1097
1098/// getT2AddrModeImm8s4OpValue - Return encoding info for
1099/// 'reg +/- imm8<<2' operand.
1100uint32_t ARMMCCodeEmitter::
1101getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
1103 const MCSubtargetInfo &STI) const {
1104 // {12-9} = reg
1105 // {8} = (U)nsigned (add == '1', sub == '0')
1106 // {7-0} = imm8
1107 unsigned Reg, Imm8;
1108 bool isAdd = true;
1109 // If The first operand isn't a register, we have a label reference.
1110 const MCOperand &MO = MI.getOperand(OpIdx);
1111 if (!MO.isReg()) {
1112 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1113 Imm8 = 0;
1114 isAdd = false ; // 'U' bit is set as part of the fixup.
1115
1116 assert(MO.isExpr() && "Unexpected machine operand type!");
1117 const MCExpr *Expr = MO.getExpr();
1119 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
1120
1121 ++MCNumCPRelocations;
1122 } else
1123 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1124
1125 // FIXME: The immediate operand should have already been encoded like this
1126 // before ever getting here. The encoder method should just need to combine
1127 // the MI operands for the register and the offset into a single
1128 // representation for the complex operand in the .td file. This isn't just
1129 // style, unfortunately. As-is, we can't represent the distinct encoding
1130 // for #-0.
1131 assert(((Imm8 & 0x3) == 0) && "Not a valid immediate!");
1132 uint32_t Binary = (Imm8 >> 2) & 0xff;
1133 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1134 if (isAdd)
1135 Binary |= (1 << 8);
1136 Binary |= (Reg << 9);
1137 return Binary;
1138}
1139
1140/// getT2AddrModeImm7s4OpValue - Return encoding info for
1141/// 'reg +/- imm7<<2' operand.
1143ARMMCCodeEmitter::getT2AddrModeImm7s4OpValue(const MCInst &MI, unsigned OpIdx,
1145 const MCSubtargetInfo &STI) const {
1146 // {11-8} = reg
1147 // {7} = (A)dd (add == '1', sub == '0')
1148 // {6-0} = imm7
1149 unsigned Reg, Imm7;
1150 // If The first operand isn't a register, we have a label reference.
1151 bool isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm7, Fixups, STI);
1152
1153 // FIXME: The immediate operand should have already been encoded like this
1154 // before ever getting here. The encoder method should just need to combine
1155 // the MI operands for the register and the offset into a single
1156 // representation for the complex operand in the .td file. This isn't just
1157 // style, unfortunately. As-is, we can't represent the distinct encoding
1158 // for #-0.
1159 uint32_t Binary = (Imm7 >> 2) & 0xff;
1160 // Immediate is always encoded as positive. The 'A' bit controls add vs sub.
1161 if (isAdd)
1162 Binary |= (1 << 7);
1163 Binary |= (Reg << 8);
1164 return Binary;
1165}
1166
1167/// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
1168/// 'reg + imm8<<2' operand.
1169uint32_t ARMMCCodeEmitter::
1170getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
1172 const MCSubtargetInfo &STI) const {
1173 // {11-8} = reg
1174 // {7-0} = imm8
1175 const MCOperand &MO = MI.getOperand(OpIdx);
1176 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1177 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1178 unsigned Imm8 = MO1.getImm();
1179 return (Reg << 8) | Imm8;
1180}
1181
1182uint32_t ARMMCCodeEmitter::getHiLoImmOpValue(const MCInst &MI, unsigned OpIdx,
1184 const MCSubtargetInfo &STI) const {
1185 // {20-16} = imm{15-12}
1186 // {11-0} = imm{11-0}
1187 const MCOperand &MO = MI.getOperand(OpIdx);
1188 if (MO.isImm())
1189 // Hi / lo bits already extracted during earlier passes.
1190 return static_cast<unsigned>(MO.getImm());
1191
1192 // Handle :upper16:, :lower16:, :upper8_15:, :upper0_7:, :lower8_15:
1193 // :lower0_7: assembly prefixes.
1194 const MCExpr *E = MO.getExpr();
1196 if (E->getKind() == MCExpr::Target) {
1197 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
1198 E = ARM16Expr->getSubExpr();
1199
1200 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(E)) {
1201 const int64_t Value = MCE->getValue();
1202 if (Value > UINT32_MAX)
1203 report_fatal_error("constant value truncated (limited to 32-bit)");
1204
1205 switch (ARM16Expr->getKind()) {
1207 return (int32_t(Value) & 0xffff0000) >> 16;
1209 return (int32_t(Value) & 0x0000ffff);
1210
1212 return (int32_t(Value) & 0xff000000) >> 24;
1214 return (int32_t(Value) & 0x00ff0000) >> 16;
1216 return (int32_t(Value) & 0x0000ff00) >> 8;
1218 return (int32_t(Value) & 0x000000ff);
1219
1220 default: llvm_unreachable("Unsupported ARMFixup");
1221 }
1222 }
1223
1224 switch (ARM16Expr->getKind()) {
1225 default: llvm_unreachable("Unsupported ARMFixup");
1229 break;
1233 break;
1235 if (!isThumb(STI))
1236 llvm_unreachable(":upper_8_15: not supported in Arm state");
1238 break;
1240 if (!isThumb(STI))
1241 llvm_unreachable(":upper_0_7: not supported in Arm state");
1243 break;
1245 if (!isThumb(STI))
1246 llvm_unreachable(":lower_8_15: not supported in Arm state");
1248 break;
1250 if (!isThumb(STI))
1251 llvm_unreachable(":lower_0_7: not supported in Arm state");
1253 break;
1254 }
1255
1256 Fixups.push_back(MCFixup::create(0, E, Kind, MI.getLoc()));
1257 return 0;
1258 }
1259 // If the expression doesn't have :upper16:, :lower16: on it, it's just a
1260 // plain immediate expression, previously those evaluated to the lower 16 bits
1261 // of the expression regardless of whether we have a movt or a movw, but that
1262 // led to misleadingly results. This is disallowed in the AsmParser in
1263 // validateInstruction() so this should never happen. The same holds for
1264 // thumb1 :upper8_15:, :upper0_7:, lower8_15: or :lower0_7: with movs or adds.
1265 llvm_unreachable("expression without :upper16:, :lower16:, :upper8_15:,"
1266 ":upper0_7:, lower8_15: or :lower0_7:");
1267}
1268
1269uint32_t ARMMCCodeEmitter::
1270getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
1272 const MCSubtargetInfo &STI) const {
1273 const MCOperand &MO = MI.getOperand(OpIdx);
1274 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1275 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1276 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1277 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1278 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
1279 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
1281 unsigned SBits = getShiftOp(ShOp);
1282
1283 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift
1284 // amount. However, it would be an easy mistake to make so check here.
1285 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount");
1286
1287 // {16-13} = Rn
1288 // {12} = isAdd
1289 // {11-0} = shifter
1290 // {3-0} = Rm
1291 // {4} = 0
1292 // {6-5} = type
1293 // {11-7} = imm
1294 uint32_t Binary = Rm;
1295 Binary |= Rn << 13;
1296 Binary |= SBits << 5;
1297 Binary |= ShImm << 7;
1298 if (isAdd)
1299 Binary |= 1 << 12;
1300 return Binary;
1301}
1302
1303uint32_t ARMMCCodeEmitter::
1304getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1306 const MCSubtargetInfo &STI) const {
1307 // {13} 1 == imm12, 0 == Rm
1308 // {12} isAdd
1309 // {11-0} imm12/Rm
1310 const MCOperand &MO = MI.getOperand(OpIdx);
1311 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1312 unsigned Imm = MO1.getImm();
1313 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
1314 bool isReg = MO.getReg() != 0;
1316 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
1317 if (isReg) {
1319 Binary <<= 7; // Shift amount is bits [11:7]
1320 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
1321 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0]
1322 }
1323 return Binary | (isAdd << 12) | (isReg << 13);
1324}
1325
1326uint32_t ARMMCCodeEmitter::
1327getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
1329 const MCSubtargetInfo &STI) const {
1330 // {4} isAdd
1331 // {3-0} Rm
1332 const MCOperand &MO = MI.getOperand(OpIdx);
1333 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1334 bool isAdd = MO1.getImm() != 0;
1335 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4);
1336}
1337
1338uint32_t ARMMCCodeEmitter::
1339getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1341 const MCSubtargetInfo &STI) const {
1342 // {9} 1 == imm8, 0 == Rm
1343 // {8} isAdd
1344 // {7-4} imm7_4/zero
1345 // {3-0} imm3_0/Rm
1346 const MCOperand &MO = MI.getOperand(OpIdx);
1347 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1348 unsigned Imm = MO1.getImm();
1349 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1350 bool isImm = MO.getReg() == 0;
1352 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1353 if (!isImm)
1355 return Imm8 | (isAdd << 8) | (isImm << 9);
1356}
1357
1358uint32_t ARMMCCodeEmitter::
1359getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
1361 const MCSubtargetInfo &STI) const {
1362 // {13} 1 == imm8, 0 == Rm
1363 // {12-9} Rn
1364 // {8} isAdd
1365 // {7-4} imm7_4/zero
1366 // {3-0} imm3_0/Rm
1367 const MCOperand &MO = MI.getOperand(OpIdx);
1368 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1369 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1370
1371 // If The first operand isn't a register, we have a label reference.
1372 if (!MO.isReg()) {
1373 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1374
1375 assert(MO.isExpr() && "Unexpected machine operand type!");
1376 const MCExpr *Expr = MO.getExpr();
1378 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
1379
1380 ++MCNumCPRelocations;
1381 return (Rn << 9) | (1 << 13);
1382 }
1383 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1384 unsigned Imm = MO2.getImm();
1385 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1386 bool isImm = MO1.getReg() == 0;
1388 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1389 if (!isImm)
1391 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1392}
1393
1394/// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1395uint32_t ARMMCCodeEmitter::
1396getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1398 const MCSubtargetInfo &STI) const {
1399 // [SP, #imm]
1400 // {7-0} = imm8
1401 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1402 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1403 "Unexpected base register!");
1404
1405 // The immediate is already shifted for the implicit zeroes, so no change
1406 // here.
1407 return MO1.getImm() & 0xff;
1408}
1409
1410/// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1411uint32_t ARMMCCodeEmitter::
1412getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1414 const MCSubtargetInfo &STI) const {
1415 // [Rn, #imm]
1416 // {7-3} = imm5
1417 // {2-0} = Rn
1418 const MCOperand &MO = MI.getOperand(OpIdx);
1419 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1420 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1421 unsigned Imm5 = MO1.getImm();
1422 return ((Imm5 & 0x1f) << 3) | Rn;
1423}
1424
1425/// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1426uint32_t ARMMCCodeEmitter::
1427getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1429 const MCSubtargetInfo &STI) const {
1430 const MCOperand MO = MI.getOperand(OpIdx);
1431 if (MO.isExpr())
1432 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups, STI);
1433 return (MO.getImm() >> 2);
1434}
1435
1436/// getAddrMode5OpValue - Return encoding info for 'reg +/- (imm8 << 2)' operand.
1437uint32_t ARMMCCodeEmitter::
1438getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1440 const MCSubtargetInfo &STI) const {
1441 // {12-9} = reg
1442 // {8} = (U)nsigned (add == '1', sub == '0')
1443 // {7-0} = imm8
1444 unsigned Reg, Imm8;
1445 bool isAdd;
1446 // If The first operand isn't a register, we have a label reference.
1447 const MCOperand &MO = MI.getOperand(OpIdx);
1448 if (!MO.isReg()) {
1449 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1450 Imm8 = 0;
1451 isAdd = false; // 'U' bit is handled as part of the fixup.
1452
1453 assert(MO.isExpr() && "Unexpected machine operand type!");
1454 const MCExpr *Expr = MO.getExpr();
1456 if (isThumb2(STI))
1458 else
1460 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
1461
1462 ++MCNumCPRelocations;
1463 } else {
1464 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1465 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1466 }
1467
1469 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1470 if (isAdd)
1471 Binary |= (1 << 8);
1472 Binary |= (Reg << 9);
1473 return Binary;
1474}
1475
1476/// getAddrMode5FP16OpValue - Return encoding info for 'reg +/- (imm8 << 1)' operand.
1477uint32_t ARMMCCodeEmitter::
1478getAddrMode5FP16OpValue(const MCInst &MI, unsigned OpIdx,
1480 const MCSubtargetInfo &STI) const {
1481 // {12-9} = reg
1482 // {8} = (U)nsigned (add == '1', sub == '0')
1483 // {7-0} = imm8
1484 unsigned Reg, Imm8;
1485 bool isAdd;
1486 // If The first operand isn't a register, we have a label reference.
1487 const MCOperand &MO = MI.getOperand(OpIdx);
1488 if (!MO.isReg()) {
1489 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1490 Imm8 = 0;
1491 isAdd = false; // 'U' bit is handled as part of the fixup.
1492
1493 assert(MO.isExpr() && "Unexpected machine operand type!");
1494 const MCExpr *Expr = MO.getExpr();
1496 if (isThumb2(STI))
1498 else
1500 Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc()));
1501
1502 ++MCNumCPRelocations;
1503 } else {
1504 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1505 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1506 }
1507
1509 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1510 if (isAdd)
1511 Binary |= (1 << 8);
1512 Binary |= (Reg << 9);
1513 return Binary;
1514}
1515
1516unsigned ARMMCCodeEmitter::
1517getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1519 const MCSubtargetInfo &STI) const {
1520 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1521 // shifted. The second is Rs, the amount to shift by, and the third specifies
1522 // the type of the shift.
1523 //
1524 // {3-0} = Rm.
1525 // {4} = 1
1526 // {6-5} = type
1527 // {11-8} = Rs
1528 // {7} = 0
1529
1530 const MCOperand &MO = MI.getOperand(OpIdx);
1531 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1532 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1534
1535 // Encode Rm.
1536 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1537
1538 // Encode the shift opcode.
1539 unsigned SBits = 0;
1540 unsigned Rs = MO1.getReg();
1541 if (Rs) {
1542 // Set shift operand (bit[7:4]).
1543 // LSL - 0001
1544 // LSR - 0011
1545 // ASR - 0101
1546 // ROR - 0111
1547 switch (SOpc) {
1548 default: llvm_unreachable("Unknown shift opc!");
1549 case ARM_AM::lsl: SBits = 0x1; break;
1550 case ARM_AM::lsr: SBits = 0x3; break;
1551 case ARM_AM::asr: SBits = 0x5; break;
1552 case ARM_AM::ror: SBits = 0x7; break;
1553 }
1554 }
1555
1556 Binary |= SBits << 4;
1557
1558 // Encode the shift operation Rs.
1559 // Encode Rs bit[11:8].
1562}
1563
1564unsigned ARMMCCodeEmitter::
1565getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1567 const MCSubtargetInfo &STI) const {
1568 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1569 // shifted. The second is the amount to shift by.
1570 //
1571 // {3-0} = Rm.
1572 // {4} = 0
1573 // {6-5} = type
1574 // {11-7} = imm
1575
1576 const MCOperand &MO = MI.getOperand(OpIdx);
1577 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1579
1580 // Encode Rm.
1581 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1582
1583 // Encode the shift opcode.
1584 unsigned SBits = 0;
1585
1586 // Set shift operand (bit[6:4]).
1587 // LSL - 000
1588 // LSR - 010
1589 // ASR - 100
1590 // ROR - 110
1591 // RRX - 110 and bit[11:8] clear.
1592 switch (SOpc) {
1593 default: llvm_unreachable("Unknown shift opc!");
1594 case ARM_AM::lsl: SBits = 0x0; break;
1595 case ARM_AM::lsr: SBits = 0x2; break;
1596 case ARM_AM::asr: SBits = 0x4; break;
1597 case ARM_AM::ror: SBits = 0x6; break;
1598 case ARM_AM::rrx:
1599 Binary |= 0x60;
1600 return Binary;
1601 }
1602
1603 // Encode shift_imm bit[11:7].
1604 Binary |= SBits << 4;
1605 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1606 assert(Offset < 32 && "Offset must be in range 0-31!");
1607 return Binary | (Offset << 7);
1608}
1609
1610
1611unsigned ARMMCCodeEmitter::
1612getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1614 const MCSubtargetInfo &STI) const {
1615 const MCOperand &MO1 = MI.getOperand(OpNum);
1616 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1617 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1618
1619 // Encoded as [Rn, Rm, imm].
1620 // FIXME: Needs fixup support.
1621 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1622 Value <<= 4;
1624 Value <<= 2;
1625 Value |= MO3.getImm();
1626
1627 return Value;
1628}
1629
1630template<unsigned Bits, unsigned Shift>
1631unsigned ARMMCCodeEmitter::
1632getT2AddrModeImmOpValue(const MCInst &MI, unsigned OpNum,
1634 const MCSubtargetInfo &STI) const {
1635 const MCOperand &MO1 = MI.getOperand(OpNum);
1636 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1637
1638 // FIXME: Needs fixup support.
1639 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1640
1641 // If the immediate is B bits long, we need B+1 bits in order
1642 // to represent the (inverse of the) sign bit.
1643 Value <<= (Bits + 1);
1644 int32_t tmp = (int32_t)MO2.getImm();
1645 if (tmp == INT32_MIN) { // represents subtracting zero rather than adding it
1646 tmp = 0;
1647 } else if (tmp < 0) {
1648 tmp = abs(tmp);
1649 } else {
1650 Value |= (1U << Bits); // Set the ADD bit
1651 }
1652 Value |= (tmp >> Shift) & ((1U << Bits) - 1);
1653 return Value;
1654}
1655
1656unsigned ARMMCCodeEmitter::
1657getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1659 const MCSubtargetInfo &STI) const {
1660 const MCOperand &MO1 = MI.getOperand(OpNum);
1661
1662 // FIXME: Needs fixup support.
1663 unsigned Value = 0;
1664 auto tmp = static_cast<uint32_t>(MO1.getImm());
1665 if (static_cast<int32_t>(tmp) < 0)
1666 tmp = -tmp;
1667 else
1668 Value |= 256; // Set the ADD bit
1669 Value |= tmp & 255;
1670 return Value;
1671}
1672
1673unsigned ARMMCCodeEmitter::
1674getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1676 const MCSubtargetInfo &STI) const {
1677 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1678 // shifted. The second is the amount to shift by.
1679 //
1680 // {3-0} = Rm.
1681 // {4} = 0
1682 // {6-5} = type
1683 // {11-7} = imm
1684
1685 const MCOperand &MO = MI.getOperand(OpIdx);
1686 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1688
1689 // Encode Rm.
1690 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1691
1692 // Encode the shift opcode.
1693 unsigned SBits = 0;
1694 // Set shift operand (bit[6:4]).
1695 // LSL - 000
1696 // LSR - 010
1697 // ASR - 100
1698 // ROR - 110
1699 switch (SOpc) {
1700 default: llvm_unreachable("Unknown shift opc!");
1701 case ARM_AM::lsl: SBits = 0x0; break;
1702 case ARM_AM::lsr: SBits = 0x2; break;
1703 case ARM_AM::asr: SBits = 0x4; break;
1704 case ARM_AM::rrx: [[fallthrough]];
1705 case ARM_AM::ror: SBits = 0x6; break;
1706 }
1707
1708 Binary |= SBits << 4;
1709 if (SOpc == ARM_AM::rrx)
1710 return Binary;
1711
1712 // Encode shift_imm bit[11:7].
1713 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1714}
1715
1716unsigned ARMMCCodeEmitter::
1717getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1719 const MCSubtargetInfo &STI) const {
1720 // 10 bits. lower 5 bits are the lsb of the mask, high five bits are the
1721 // msb of the mask.
1722 const MCOperand &MO = MI.getOperand(Op);
1723 uint32_t v = ~MO.getImm();
1724 uint32_t lsb = llvm::countr_zero(v);
1725 uint32_t msb = llvm::Log2_32(v);
1726 assert(v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1727 return lsb | (msb << 5);
1728}
1729
1730unsigned ARMMCCodeEmitter::
1731getRegisterListOpValue(const MCInst &MI, unsigned Op,
1733 const MCSubtargetInfo &STI) const {
1734 // VLDM/VSTM/VSCCLRM:
1735 // {12-8} = Vd
1736 // {7-0} = Number of registers
1737 //
1738 // LDM/STM:
1739 // {15-0} = Bitfield of GPRs.
1740 unsigned Reg = MI.getOperand(Op).getReg();
1741 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1742 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1743
1744 unsigned Binary = 0;
1745
1746 if (SPRRegs || DPRRegs) {
1747 // VLDM/VSTM/VSCCLRM
1748 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
1749 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1750 Binary |= (RegNo & 0x1f) << 8;
1751
1752 // Ignore VPR
1753 if (MI.getOpcode() == ARM::VSCCLRMD || MI.getOpcode() == ARM::VSCCLRMS)
1754 --NumRegs;
1755 if (SPRRegs)
1756 Binary |= NumRegs;
1757 else
1758 Binary |= NumRegs * 2;
1759 } else {
1760 const MCRegisterInfo &MRI = *CTX.getRegisterInfo();
1762 [&](const MCOperand &LHS, const MCOperand &RHS) {
1763 return MRI.getEncodingValue(LHS.getReg()) <
1764 MRI.getEncodingValue(RHS.getReg());
1765 }));
1766 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1767 unsigned RegNo = MRI.getEncodingValue(MI.getOperand(I).getReg());
1768 Binary |= 1 << RegNo;
1769 }
1770 }
1771
1772 return Binary;
1773}
1774
1775/// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1776/// with the alignment operand.
1777unsigned ARMMCCodeEmitter::
1778getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1780 const MCSubtargetInfo &STI) const {
1781 const MCOperand &Reg = MI.getOperand(Op);
1782 const MCOperand &Imm = MI.getOperand(Op + 1);
1783
1784 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1785 unsigned Align = 0;
1786
1787 switch (Imm.getImm()) {
1788 default: break;
1789 case 2:
1790 case 4:
1791 case 8: Align = 0x01; break;
1792 case 16: Align = 0x02; break;
1793 case 32: Align = 0x03; break;
1794 }
1795
1796 return RegNo | (Align << 4);
1797}
1798
1799/// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1800/// along with the alignment operand for use in VST1 and VLD1 with size 32.
1801unsigned ARMMCCodeEmitter::
1802getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1804 const MCSubtargetInfo &STI) const {
1805 const MCOperand &Reg = MI.getOperand(Op);
1806 const MCOperand &Imm = MI.getOperand(Op + 1);
1807
1808 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1809 unsigned Align = 0;
1810
1811 switch (Imm.getImm()) {
1812 default: break;
1813 case 8:
1814 case 16:
1815 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1816 case 2: Align = 0x00; break;
1817 case 4: Align = 0x03; break;
1818 }
1819
1820 return RegNo | (Align << 4);
1821}
1822
1823
1824/// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1825/// alignment operand for use in VLD-dup instructions. This is the same as
1826/// getAddrMode6AddressOpValue except for the alignment encoding, which is
1827/// different for VLD4-dup.
1828unsigned ARMMCCodeEmitter::
1829getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1831 const MCSubtargetInfo &STI) const {
1832 const MCOperand &Reg = MI.getOperand(Op);
1833 const MCOperand &Imm = MI.getOperand(Op + 1);
1834
1835 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1836 unsigned Align = 0;
1837
1838 switch (Imm.getImm()) {
1839 default: break;
1840 case 2:
1841 case 4:
1842 case 8: Align = 0x01; break;
1843 case 16: Align = 0x03; break;
1844 }
1845
1846 return RegNo | (Align << 4);
1847}
1848
1849unsigned ARMMCCodeEmitter::
1850getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1852 const MCSubtargetInfo &STI) const {
1853 const MCOperand &MO = MI.getOperand(Op);
1854 if (MO.getReg() == 0) return 0x0D;
1855 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1856}
1857
1858unsigned ARMMCCodeEmitter::
1859getShiftRight8Imm(const MCInst &MI, unsigned Op,
1861 const MCSubtargetInfo &STI) const {
1862 return 8 - MI.getOperand(Op).getImm();
1863}
1864
1865unsigned ARMMCCodeEmitter::
1866getShiftRight16Imm(const MCInst &MI, unsigned Op,
1868 const MCSubtargetInfo &STI) const {
1869 return 16 - MI.getOperand(Op).getImm();
1870}
1871
1872unsigned ARMMCCodeEmitter::
1873getShiftRight32Imm(const MCInst &MI, unsigned Op,
1875 const MCSubtargetInfo &STI) const {
1876 return 32 - MI.getOperand(Op).getImm();
1877}
1878
1879unsigned ARMMCCodeEmitter::
1880getShiftRight64Imm(const MCInst &MI, unsigned Op,
1882 const MCSubtargetInfo &STI) const {
1883 return 64 - MI.getOperand(Op).getImm();
1884}
1885
1886void ARMMCCodeEmitter::encodeInstruction(const MCInst &MI,
1889 const MCSubtargetInfo &STI) const {
1890 // Pseudo instructions don't get encoded.
1891 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1892 uint64_t TSFlags = Desc.TSFlags;
1893 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1894 return;
1895
1896 int Size;
1897 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1898 Size = Desc.getSize();
1899 else
1900 llvm_unreachable("Unexpected instruction size!");
1901
1902 auto Endian =
1904 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups, STI);
1905 if (Size == 2) {
1906 support::endian::write<uint16_t>(CB, Binary, Endian);
1907 } else if (isThumb(STI)) {
1908 // Thumb 32-bit wide instructions need to emit the high order halfword
1909 // first.
1910 support::endian::write<uint16_t>(CB, Binary >> 16, Endian);
1911 support::endian::write<uint16_t>(CB, Binary & 0xffff, Endian);
1912 } else {
1913 support::endian::write<uint32_t>(CB, Binary, Endian);
1914 }
1915 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1916}
1917
1918template <bool isNeg, ARM::Fixups fixup>
1920ARMMCCodeEmitter::getBFTargetOpValue(const MCInst &MI, unsigned OpIdx,
1922 const MCSubtargetInfo &STI) const {
1923 const MCOperand MO = MI.getOperand(OpIdx);
1924 if (MO.isExpr())
1925 return ::getBranchTargetOpValue(MI, OpIdx, fixup, Fixups, STI);
1926 return isNeg ? -(MO.getImm() >> 1) : (MO.getImm() >> 1);
1927}
1928
1930ARMMCCodeEmitter::getBFAfterTargetOpValue(const MCInst &MI, unsigned OpIdx,
1932 const MCSubtargetInfo &STI) const {
1933 const MCOperand MO = MI.getOperand(OpIdx);
1934 const MCOperand BranchMO = MI.getOperand(0);
1935
1936 if (MO.isExpr()) {
1937 assert(BranchMO.isExpr());
1938 const MCExpr *DiffExpr = MCBinaryExpr::createSub(
1939 MO.getExpr(), BranchMO.getExpr(), CTX);
1941 Fixups.push_back(llvm::MCFixup::create(0, DiffExpr, Kind, MI.getLoc()));
1942 return 0;
1943 }
1944
1945 assert(MO.isImm() && BranchMO.isImm());
1946 int Diff = MO.getImm() - BranchMO.getImm();
1947 assert(Diff == 4 || Diff == 2);
1948
1949 return Diff == 4;
1950}
1951
1952uint32_t ARMMCCodeEmitter::getVPTMaskOpValue(const MCInst &MI, unsigned OpIdx,
1954 const MCSubtargetInfo &STI)const {
1955 const MCOperand MO = MI.getOperand(OpIdx);
1956 assert(MO.isImm() && "Unexpected operand type!");
1957
1958 int Value = MO.getImm();
1959 int Imm = 0;
1960
1961 // VPT Masks are actually encoded as a series of invert/don't invert bits,
1962 // rather than true/false bits.
1963 unsigned PrevBit = 0;
1964 for (int i = 3; i >= 0; --i) {
1965 unsigned Bit = (Value >> i) & 1;
1966
1967 // Check if we are at the end of the mask.
1968 if ((Value & ~(~0U << i)) == 0) {
1969 Imm |= (1 << i);
1970 break;
1971 }
1972
1973 // Convert the bit in the mask based on the previous bit.
1974 if (Bit != PrevBit)
1975 Imm |= (1 << i);
1976
1977 PrevBit = Bit;
1978 }
1979
1980 return Imm;
1981}
1982
1983uint32_t ARMMCCodeEmitter::getRestrictedCondCodeOpValue(
1984 const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,
1985 const MCSubtargetInfo &STI) const {
1986
1987 const MCOperand MO = MI.getOperand(OpIdx);
1988 assert(MO.isImm() && "Unexpected operand type!");
1989
1990 switch (MO.getImm()) {
1991 default:
1992 assert(0 && "Unexpected Condition!");
1993 return 0;
1994 case ARMCC::HS:
1995 case ARMCC::EQ:
1996 return 0;
1997 case ARMCC::HI:
1998 case ARMCC::NE:
1999 return 1;
2000 case ARMCC::GE:
2001 return 4;
2002 case ARMCC::LT:
2003 return 5;
2004 case ARMCC::GT:
2005 return 6;
2006 case ARMCC::LE:
2007 return 7;
2008 }
2009}
2010
2011uint32_t ARMMCCodeEmitter::
2012getPowerTwoOpValue(const MCInst &MI, unsigned OpIdx,
2014 const MCSubtargetInfo &STI) const {
2015 const MCOperand &MO = MI.getOperand(OpIdx);
2016 assert(MO.isImm() && "Unexpected operand type!");
2017 return llvm::countr_zero((uint64_t)MO.getImm());
2018}
2019
2020template <unsigned start>
2021uint32_t ARMMCCodeEmitter::
2022getMVEPairVectorIndexOpValue(const MCInst &MI, unsigned OpIdx,
2024 const MCSubtargetInfo &STI) const {
2025 const MCOperand MO = MI.getOperand(OpIdx);
2026 assert(MO.isImm() && "Unexpected operand type!");
2027
2028 int Value = MO.getImm();
2029 return Value - start;
2030}
2031
2032#include "ARMGenMCCodeEmitter.inc"
2033
2035 MCContext &Ctx) {
2036 return new ARMMCCodeEmitter(MCII, Ctx, true);
2037}
2038
2040 MCContext &Ctx) {
2041 return new ARMMCCodeEmitter(MCII, Ctx, false);
2042}
unsigned const MachineRegisterInfo * MRI
This file declares a class to represent arbitrary precision floating point values and provide a varie...
This file implements a class to represent arbitrary precision integral constant values and operations...
static bool isThumb(const MCSubtargetInfo &STI)
static bool HasConditionalBranch(const MCInst &MI)
Return true if this branch has a non-always predication.
static int32_t encodeThumbBLOffset(int32_t offset)
static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, unsigned FixupKind, SmallVectorImpl< MCFixup > &Fixups, const MCSubtargetInfo &STI)
getBranchTargetOpValue - Helper function to get the branch target operand, which is either an immedia...
static bool isNeg(Value *V)
Returns true if the operation is a negation of V, and it works for both integers and floats.
uint64_t Size
IRTranslator LLVM IR MI
#define I(x, y, z)
Definition: MD5.cpp:58
static bool isReg(const MCInst &MI, unsigned OpNo)
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
static bool isImm(const MachineOperand &MO, MachineRegisterInfo *MRI)
endianness Endian
This file defines the SmallVector class.
This file defines the 'Statistic' class, which is designed to be an easy way to expose various metric...
#define STATISTIC(VARNAME, DESC)
Definition: Statistic.h:167
Value * RHS
Value * LHS
APInt bitcastToAPInt() const
Definition: APFloat.h:1210
APInt getHiBits(unsigned numBits) const
Compute an APInt containing numBits highbits from this APInt.
Definition: APInt.cpp:608
uint64_t getLimitedValue(uint64_t Limit=UINT64_MAX) const
If this value is smaller than the specified limit, return it, otherwise return the limit value.
Definition: APInt.h:453
VariantKind getKind() const
getOpcode - Get the kind of this expression.
Definition: ARMMCExpr.h:76
const MCExpr * getSubExpr() const
getSubExpr - Get the child of this expression.
Definition: ARMMCExpr.h:79
This class represents an Operation in the Expression.
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:621
MCCodeEmitter - Generic instruction encoding interface.
Definition: MCCodeEmitter.h:21
virtual void encodeInstruction(const MCInst &Inst, SmallVectorImpl< char > &CB, SmallVectorImpl< MCFixup > &Fixups, const MCSubtargetInfo &STI) const =0
Encode the given Inst to bytes and append to CB.
MCCodeEmitter & operator=(const MCCodeEmitter &)=delete
Context object for machine code objects.
Definition: MCContext.h:81
const MCRegisterInfo * getRegisterInfo() const
Definition: MCContext.h:455
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
@ Target
Target specific expression.
Definition: MCExpr.h:42
ExprKind getKind() const
Definition: MCExpr.h:81
static MCFixup create(uint32_t Offset, const MCExpr *Value, MCFixupKind Kind, SMLoc Loc=SMLoc())
Definition: MCFixup.h:87
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:184
Describe properties that are true of each instruction in the target description file.
Definition: MCInstrDesc.h:198
Interface to description of machine instruction set.
Definition: MCInstrInfo.h:26
const MCInstrDesc & get(unsigned Opcode) const
Return the machine instruction descriptor that corresponds to the specified instruction opcode.
Definition: MCInstrInfo.h:63
Instances of this class represent operands of the MCInst class.
Definition: MCInst.h:36
int64_t getImm() const
Definition: MCInst.h:80
bool isImm() const
Definition: MCInst.h:62
unsigned getReg() const
Returns the register number.
Definition: MCInst.h:69
bool isReg() const
Definition: MCInst.h:61
bool isDFPImm() const
Definition: MCInst.h:64
const MCExpr * getExpr() const
Definition: MCInst.h:114
uint64_t getDFPImm() const
Definition: MCInst.h:100
bool isExpr() const
Definition: MCInst.h:65
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
uint16_t getEncodingValue(MCRegister RegNo) const
Returns the encoding for RegNo.
Generic base class for all target subtargets.
bool hasFeature(unsigned Feature) const
const Triple & getTargetTriple() const
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: SmallVector.h:586
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
LLVM Value Representation.
Definition: Value.h:74
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
unsigned char getAM3Offset(unsigned AM3Opc)
unsigned getSORegOffset(unsigned Op)
int getSOImmVal(unsigned Arg)
getSOImmVal - Given a 32-bit immediate, if it is something that can fit into an shifter_operand immed...
ShiftOpc getAM2ShiftOpc(unsigned AM2Opc)
unsigned getAM2Offset(unsigned AM2Opc)
int getT2SOImmVal(unsigned Arg)
getT2SOImmVal - Given a 32-bit immediate, if it is something that can fit into a Thumb-2 shifter_oper...
ShiftOpc getSORegShOp(unsigned Op)
AddrOpc getAM5Op(unsigned AM5Opc)
unsigned char getAM5Offset(unsigned AM5Opc)
AddrOpc getAM2Op(unsigned AM2Opc)
AddrOpc getAM3Op(unsigned AM3Opc)
@ fixup_arm_thumb_br
Definition: ARMFixupKinds.h:60
@ fixup_thumb_adr_pcrel_10
Definition: ARMFixupKinds.h:43
@ fixup_arm_thumb_upper_8_15
@ fixup_arm_adr_pcrel_12
Definition: ARMFixupKinds.h:45
@ fixup_arm_pcrel_10
Definition: ARMFixupKinds.h:29
@ fixup_arm_uncondbranch
Definition: ARMFixupKinds.h:51
@ fixup_arm_thumb_cb
Definition: ARMFixupKinds.h:87
@ fixup_arm_movw_lo16
Definition: ARMFixupKinds.h:98
@ fixup_t2_movt_hi16
Definition: ARMFixupKinds.h:99
@ fixup_t2_ldst_pcrel_12
Definition: ARMFixupKinds.h:21
@ fixup_arm_thumb_lower_0_7
@ fixup_arm_ldst_abs_12
Definition: ARMFixupKinds.h:40
@ fixup_arm_pcrel_9
Definition: ARMFixupKinds.h:35
@ fixup_arm_movt_hi16
Definition: ARMFixupKinds.h:97
@ fixup_t2_pcrel_9
Definition: ARMFixupKinds.h:38
@ fixup_t2_pcrel_10
Definition: ARMFixupKinds.h:32
@ fixup_arm_thumb_blx
Definition: ARMFixupKinds.h:84
@ fixup_arm_thumb_cp
Definition: ARMFixupKinds.h:90
@ fixup_t2_uncondbranch
Definition: ARMFixupKinds.h:57
@ fixup_arm_uncondbl
Definition: ARMFixupKinds.h:72
@ fixup_arm_pcrel_10_unscaled
Definition: ARMFixupKinds.h:25
@ fixup_arm_thumb_bcc
Definition: ARMFixupKinds.h:93
@ fixup_arm_thumb_upper_0_7
@ fixup_bfcsel_else_target
@ fixup_t2_adr_pcrel_12
Definition: ARMFixupKinds.h:47
@ fixup_t2_condbranch
Definition: ARMFixupKinds.h:54
@ fixup_arm_condbl
Definition: ARMFixupKinds.h:75
@ fixup_arm_ldst_pcrel_12
Definition: ARMFixupKinds.h:18
@ fixup_arm_thumb_lower_8_15
@ fixup_arm_thumb_bl
Definition: ARMFixupKinds.h:81
@ fixup_t2_movw_lo16
@ fixup_arm_condbranch
Definition: ARMFixupKinds.h:49
constexpr std::underlying_type_t< E > Mask()
Get a bitmask with 1s in all places up to the high-order bit of E's largest value.
Definition: BitmaskEnum.h:121
Reg
All possible values of the reg field in the ModR/M byte.
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
auto drop_begin(T &&RangeOrContainer, size_t N=1)
Return a range covering RangeOrContainer with the first N elements excluded.
Definition: STLExtras.h:329
@ Offset
Definition: DWP.cpp:456
APFloat abs(APFloat X)
Returns the absolute value of the argument.
Definition: APFloat.h:1381
MCCodeEmitter * createARMLEMCCodeEmitter(const MCInstrInfo &MCII, MCContext &Ctx)
int countr_zero(T Val)
Count number of 0's from the least significant bit to the most stopping at the first 1.
Definition: bit.h:215
unsigned M1(unsigned Val)
Definition: VE.h:376
unsigned Log2_32(uint32_t Value)
Return the floor log base 2 of the specified value, -1 if the value is zero.
Definition: MathExtras.h:313
void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:156
MCFixupKind
Extensible enumeration to represent the type of a fixup.
Definition: MCFixup.h:21
bool is_sorted(R &&Range, Compare C)
Wrapper function around std::is_sorted to check if elements in a range R are sorted with respect to a...
Definition: STLExtras.h:1902
DWARFExpression::Operation Op
unsigned M0(unsigned Val)
Definition: VE.h:375
MCCodeEmitter * createARMBEMCCodeEmitter(const MCInstrInfo &MCII, MCContext &Ctx)
This struct is a compact representation of a valid (non-zero power of two) alignment.
Definition: Alignment.h:39
Description of the encoding of one expression Op.