test/MC/ARM/basic-thumb-instructions.s

   1 @---
   2 @ Run these test in both Thumb1 and Thumb2 modes, as all of the encodings
   3 @ should be valid, and parse the same, in both.
   4 @---
   5 @ RUN: llvm-mc -triple=thumbv6-apple-darwin -show-encoding < %s | FileCheck %s
   6 @ RUN: llvm-mc -triple=thumbv7-apple-darwin -show-encoding < %s | FileCheck %s
   7   .syntax unified
   8   .globl _func
   9
  10 @ Check that the assembler can handle the documented syntax from the ARM ARM.
  11 @ For complex constructs like shifter operands, check more thoroughly for them
  12 @ once then spot check that following instructions accept the form generally.
  13 @ This gives us good coverage while keeping the overall size of the test
  14 @ more reasonable.
  15
  16
  17 @ FIXME: Some 3-operand instructions have a 2-operand assembly syntax.
  18
  19 _func:
  20 @ CHECK: _func
  21
  22 @------------------------------------------------------------------------------
  23 @ ADC (register)
  24 @------------------------------------------------------------------------------
  25         adcs r4, r6
  26
  27 @ CHECK: adcs   r4, r6                  @ encoding: [0x74,0x41]
  28
  29
  30 @------------------------------------------------------------------------------
  31 @ ADD (immediate)
  32 @------------------------------------------------------------------------------
  33         adds r1, r2, #3
  34 @ When Rd is not explicitly specified, encoding T2 is preferred even though
  35 @ the literal is in the range [0,7] which would allow encoding T1.
  36         adds r2, #3
  37         adds r2, #8
  38
  39 @ CHECK: adds   r1, r2, #3              @ encoding: [0xd1,0x1c]
  40 @ CHECK: adds   r2, #3                  @ encoding: [0x03,0x32]
  41 @ CHECK: adds   r2, #8                  @ encoding: [0x08,0x32]
  42
  43
  44 @------------------------------------------------------------------------------
  45 @ ADD (register)
  46 @------------------------------------------------------------------------------
  47         adds r1, r2, r3
  48         add r2, r8
  49
  50 @ CHECK: adds   r1, r2, r3              @ encoding: [0xd1,0x18]
  51 @ CHECK: add    r2, r8                  @ encoding: [0x42,0x44]
  52
  53
  54 @------------------------------------------------------------------------------
  55 @ ADD (SP plus immediate)
  56 @------------------------------------------------------------------------------
  57         add sp, #4
  58         add sp, #508
  59         add sp, sp, #4
  60         add r2, sp, #8
  61         add r2, sp, #1020
  62         add sp, sp, #-8
  63         add sp, #-8
  64
  65 @ CHECK: add    sp, #4                  @ encoding: [0x01,0xb0]
  66 @ CHECK: add    sp, #508                @ encoding: [0x7f,0xb0]
  67 @ CHECK: add    sp, #4                  @ encoding: [0x01,0xb0]
  68 @ CHECK: add    r2, sp, #8              @ encoding: [0x02,0xaa]
  69 @ CHECK: add    r2, sp, #1020           @ encoding: [0xff,0xaa]
  70 @ CHECK: sub    sp, #8                  @ encoding: [0x82,0xb0]
  71 @ CHECK: sub    sp, #8                  @ encoding: [0x82,0xb0]
  72
  73
  74 @------------------------------------------------------------------------------
  75 @ ADD (SP plus register)
  76 @------------------------------------------------------------------------------
  77         add sp, r3
  78         add r2, sp, r2
  79
  80 @ CHECK: add    sp, r3                  @ encoding: [0x9d,0x44]
  81 @ CHECK: add    r2, sp, r2              @ encoding: [0x6a,0x44]
  82
  83
  84 @------------------------------------------------------------------------------
  85 @ ADR
  86 @------------------------------------------------------------------------------
  87         adr r2, _baz
  88         adr     r2, #3
  89
  90 @ CHECK: adr    r2, _baz                @ encoding: [A,0xa2]
  91             @   fixup A - offset: 0, value: _baz, kind: fixup_thumb_adr_pcrel_10
  92 @ CHECK: adr    r2, #3                  @ encoding: [0x03,0xa2]
  93
  94 @------------------------------------------------------------------------------
  95 @ ASR (immediate)
  96 @------------------------------------------------------------------------------
  97         asrs r2, r3, #32
  98         asrs r2, r3, #5
  99         asrs r2, r3, #1
 100
 101 @ CHECK: asrs   r2, r3, #32             @ encoding: [0x1a,0x10]
 102 @ CHECK: asrs   r2, r3, #5              @ encoding: [0x5a,0x11]
 103 @ CHECK: asrs   r2, r3, #1              @ encoding: [0x5a,0x10]
 104
 105
 106 @------------------------------------------------------------------------------
 107 @ ASR (register)
 108 @------------------------------------------------------------------------------
 109         asrs r5, r2
 110
 111 @ CHECK: asrs   r5, r2                  @ encoding: [0x15,0x41]
 112
 113
 114 @------------------------------------------------------------------------------
 115 @ B
 116 @------------------------------------------------------------------------------
 117         b _baz
 118         beq _bar
 119         b       #1838
 120         b       #-420
 121         beq     #336
 122         beq     #160
 123
 124 @ CHECK: b      _baz                    @ encoding: [A,0xe0'A']
 125              @   fixup A - offset: 0, value: _baz, kind: fixup_arm_thumb_br
 126 @ CHECK: beq    _bar                    @ encoding: [A,0xd0]
 127              @   fixup A - offset: 0, value: _bar, kind: fixup_arm_thumb_bcc
 128 @ CHECK: b       #1838                   @ encoding: [0x97,0xe3]
 129 @ CHECK: b       #-420                   @ encoding: [0x2e,0xe7]
 130 @ CHECK: beq     #336                    @ encoding: [0xa8,0xd0]
 131 @ CHECK: beq     #160                    @ encoding: [0x50,0xd0]
 132
 133 @------------------------------------------------------------------------------
 134 @ BL/BLX
 135 @------------------------------------------------------------------------------
 136         blx     #884800
 137         blx     #1769600
 138
 139 @ CHECK: blx     #884800                 @ encoding: [0xd8,0xf0,0x20,0xe8]
 140 @ CHECK: blx     #1769600                @ encoding: [0xb0,0xf1,0x40,0xe8]
 141
 142 @------------------------------------------------------------------------------
 143 @ BICS
 144 @------------------------------------------------------------------------------
 145         bics r1, r6
 146
 147 @ CHECK: bics   r1, r6                  @ encoding: [0xb1,0x43]
 148
 149
 150 @------------------------------------------------------------------------------
 151 @ BKPT
 152 @------------------------------------------------------------------------------
 153         bkpt #0
 154         bkpt #255
 155
 156 @ CHECK: bkpt   #0                      @ encoding: [0x00,0xbe]
 157 @ CHECK: bkpt   #255                    @ encoding: [0xff,0xbe]
 158
 159
 160 @------------------------------------------------------------------------------
 161 @ BL/BLX (immediate)
 162 @------------------------------------------------------------------------------
 163         bl _bar
 164         blx _baz
 165
 166 @ CHECK: bl     _bar                    @ encoding: [A,0xf0'A',A,0xf8'A']
 167              @   fixup A - offset: 0, value: _bar, kind: fixup_arm_thumb_bl
 168 @ CHECK: blx    _baz                    @ encoding: [A,0xf0'A',A,0xe8'A']
 169              @   fixup A - offset: 0, value: _baz, kind: fixup_arm_thumb_blx
 170
 171
 172 @------------------------------------------------------------------------------
 173 @ BLX (register)
 174 @------------------------------------------------------------------------------
 175         blx r4
 176
 177 @ CHECK: blx    r4                      @ encoding: [0xa0,0x47]
 178
 179
 180 @------------------------------------------------------------------------------
 181 @ BX
 182 @------------------------------------------------------------------------------
 183         bx r2
 184
 185 @ CHECK: bx     r2                      @ encoding: [0x10,0x47]
 186
 187
 188 @------------------------------------------------------------------------------
 189 @ CMN
 190 @------------------------------------------------------------------------------
 191
 192         cmn r5, r1
 193
 194 @ CHECK: cmn    r5, r1                  @ encoding: [0xcd,0x42]
 195
 196
 197 @------------------------------------------------------------------------------
 198 @ CMP
 199 @------------------------------------------------------------------------------
 200         cmp r6, #32
 201         cmp r3, r4
 202         cmp r8, r1
 203
 204 @ CHECK: cmp    r6, #32                 @ encoding: [0x20,0x2e]
 205 @ CHECK: cmp    r3, r4                  @ encoding: [0xa3,0x42]
 206 @ CHECK: cmp    r8, r1                  @ encoding: [0x88,0x45]
 207
 208 @------------------------------------------------------------------------------
 209 @ EOR
 210 @------------------------------------------------------------------------------
 211         eors r4, r5
 212
 213 @ CHECK: eors   r4, r5                  @ encoding: [0x6c,0x40]
 214
 215
 216 @------------------------------------------------------------------------------
 217 @ LDM
 218 @------------------------------------------------------------------------------
 219         ldm r3, {r0, r1, r2, r3, r4, r5, r6, r7}
 220         ldm r2!, {r1, r3, r4, r5, r7}
 221         ldm r1, {r1}
 222
 223 @ CHECK: ldm    r3, {r0, r1, r2, r3, r4, r5, r6, r7} @ encoding: [0xff,0xcb]
 224 @ CHECK: ldm    r2!, {r1, r3, r4, r5, r7} @ encoding: [0xba,0xca]
 225 @ CHECK: ldm    r1, {r1}                @ encoding: [0x02,0xc9]
 226
 227
 228 @------------------------------------------------------------------------------
 229 @ LDR (immediate)
 230 @------------------------------------------------------------------------------
 231         ldr r1, [r5]
 232         ldr r2, [r6, #32]
 233         ldr r3, [r7, #124]
 234         ldr r1, [sp]
 235         ldr r2, [sp, #24]
 236         ldr r3, [sp, #1020]
 237
 238
 239 @ CHECK: ldr    r1, [r5]                @ encoding: [0x29,0x68]
 240 @ CHECK: ldr    r2, [r6, #32]           @ encoding: [0x32,0x6a]
 241 @ CHECK: ldr    r3, [r7, #124]          @ encoding: [0xfb,0x6f]
 242 @ CHECK: ldr    r1, [sp]                @ encoding: [0x00,0x99]
 243 @ CHECK: ldr    r2, [sp, #24]           @ encoding: [0x06,0x9a]
 244 @ CHECK: ldr    r3, [sp, #1020]         @ encoding: [0xff,0x9b]
 245
 246
 247 @------------------------------------------------------------------------------
 248 @ LDR (literal)
 249 @------------------------------------------------------------------------------
 250         ldr r1, _foo
 251         ldr     r3, #604
 252         ldr     r3, #368
 253
 254 @ CHECK: ldr    r1, _foo                @ encoding: [A,0x49]
 255              @   fixup A - offset: 0, value: _foo, kind: fixup_arm_thumb_cp
 256 @ CHECK: ldr     r3, #604                @ encoding: [0x97,0x4b]
 257 @ CHECK: ldr     r3, #368                @ encoding: [0x5c,0x4b]
 258
 259 @------------------------------------------------------------------------------
 260 @ LDR (register)
 261 @------------------------------------------------------------------------------
 262         ldr r1, [r2, r3]
 263
 264 @ CHECK: ldr    r1, [r2, r3]            @ encoding: [0xd1,0x58]
 265
 266
 267 @------------------------------------------------------------------------------
 268 @ LDRB (immediate)
 269 @------------------------------------------------------------------------------
 270         ldrb r4, [r3]
 271         ldrb r5, [r6, #0]
 272         ldrb r6, [r7, #31]
 273
 274 @ CHECK: ldrb   r4, [r3]                @ encoding: [0x1c,0x78]
 275 @ CHECK: ldrb   r5, [r6]                @ encoding: [0x35,0x78]
 276 @ CHECK: ldrb   r6, [r7, #31]           @ encoding: [0xfe,0x7f]
 277
 278
 279 @------------------------------------------------------------------------------
 280 @ LDRB (register)
 281 @------------------------------------------------------------------------------
 282         ldrb r6, [r4, r5]
 283
 284 @ CHECK: ldrb   r6, [r4, r5]            @ encoding: [0x66,0x5d]
 285
 286
 287 @------------------------------------------------------------------------------
 288 @ LDRH (immediate)
 289 @------------------------------------------------------------------------------
 290         ldrh r3, [r3]
 291         ldrh r4, [r6, #2]
 292         ldrh r5, [r7, #62]
 293
 294 @ CHECK: ldrh   r3, [r3]                @ encoding: [0x1b,0x88]
 295 @ CHECK: ldrh   r4, [r6, #2]            @ encoding: [0x74,0x88]
 296 @ CHECK: ldrh   r5, [r7, #62]           @ encoding: [0xfd,0x8f]
 297
 298
 299 @------------------------------------------------------------------------------
 300 @ LDRH (register)
 301 @------------------------------------------------------------------------------
 302         ldrh r6, [r2, r6]
 303
 304 @ CHECK: ldrh   r6, [r2, r6]            @ encoding: [0x96,0x5b]
 305
 306
 307 @------------------------------------------------------------------------------
 308 @ LDRSB/LDRSH
 309 @------------------------------------------------------------------------------
 310         ldrsb r6, [r2, r6]
 311         ldrsh r3, [r7, r1]
 312
 313 @ CHECK: ldrsb  r6, [r2, r6]            @ encoding: [0x96,0x57]
 314 @ CHECK: ldrsh  r3, [r7, r1]            @ encoding: [0x7b,0x5e]
 315
 316
 317 @------------------------------------------------------------------------------
 318 @ LSL (immediate)
 319 @------------------------------------------------------------------------------
 320         lsls r4, r5, #0
 321         lsls r4, r5, #4
 322
 323 @ CHECK: lsls   r4, r5, #0              @ encoding: [0x2c,0x00]
 324 @ CHECK: lsls   r4, r5, #4              @ encoding: [0x2c,0x01]
 325
 326
 327 @------------------------------------------------------------------------------
 328 @ LSL (register)
 329 @------------------------------------------------------------------------------
 330         lsls r2, r6
 331
 332 @ CHECK: lsls   r2, r6                  @ encoding: [0xb2,0x40]
 333
 334
 335 @------------------------------------------------------------------------------
 336 @ LSR (immediate)
 337 @------------------------------------------------------------------------------
 338         lsrs r1, r3, #1
 339         lsrs r1, r3, #32
 340
 341 @ CHECK: lsrs   r1, r3, #1              @ encoding: [0x59,0x08]
 342 @ CHECK: lsrs   r1, r3, #32             @ encoding: [0x19,0x08]
 343
 344
 345 @------------------------------------------------------------------------------
 346 @ LSR (register)
 347 @------------------------------------------------------------------------------
 348         lsrs r2, r6
 349
 350 @ CHECK: lsrs   r2, r6                  @ encoding: [0xf2,0x40]
 351
 352
 353 @------------------------------------------------------------------------------
 354 @ MOV (immediate)
 355 @------------------------------------------------------------------------------
 356         movs r2, #0
 357         movs r2, #255
 358         movs r2, #23
 359
 360 @ CHECK: movs   r2, #0                  @ encoding: [0x00,0x22]
 361 @ CHECK: movs   r2, #255                @ encoding: [0xff,0x22]
 362 @ CHECK: movs   r2, #23                 @ encoding: [0x17,0x22]
 363
 364
 365 @------------------------------------------------------------------------------
 366 @ MOV (register)
 367 @------------------------------------------------------------------------------
 368         mov r3, r4
 369         movs r1, r3
 370
 371 @ CHECK: mov    r3, r4                  @ encoding: [0x23,0x46]
 372 @ CHECK: movs   r1, r3                  @ encoding: [0x19,0x00]
 373
 374
 375 @------------------------------------------------------------------------------
 376 @ MUL
 377 @------------------------------------------------------------------------------
 378         muls r1, r2, r1
 379         muls r2, r2, r3
 380         muls r3, r4
 381
 382 @ CHECK: muls   r1, r2, r1              @ encoding: [0x51,0x43]
 383 @ CHECK: muls   r2, r3, r2              @ encoding: [0x5a,0x43]
 384 @ CHECK: muls   r3, r4, r3              @ encoding: [0x63,0x43]
 385
 386
 387 @------------------------------------------------------------------------------
 388 @ MVN
 389 @------------------------------------------------------------------------------
 390         mvns r6, r3
 391
 392 @ CHECK: mvns   r6, r3                  @ encoding: [0xde,0x43]
 393
 394
 395 @------------------------------------------------------------------------------
 396 @ NEG
 397 @------------------------------------------------------------------------------
 398         negs r3, r4
 399
 400 @ CHECK: rsbs   r3, r4, #0              @ encoding: [0x63,0x42]
 401
 402 @------------------------------------------------------------------------------
 403 @ ORR
 404 @------------------------------------------------------------------------------
 405         orrs  r3, r4
 406
 407 @ CHECK-ERRORS:         orrs    r3, r4                  @ encoding: [0x23,0x43]
 408
 409
 410 @------------------------------------------------------------------------------
 411 @ POP
 412 @------------------------------------------------------------------------------
 413         pop {r2, r3, r6}
 414
 415 @ CHECK: pop    {r2, r3, r6}            @ encoding: [0x4c,0xbc]
 416
 417
 418 @------------------------------------------------------------------------------
 419 @ PUSH
 420 @------------------------------------------------------------------------------
 421         push {r1, r2, r7}
 422
 423 @ CHECK: push   {r1, r2, r7}            @ encoding: [0x86,0xb4]
 424
 425
 426 @------------------------------------------------------------------------------
 427 @ REV/REV16/REVSH
 428 @------------------------------------------------------------------------------
 429         rev r6, r3
 430         rev16 r7, r2
 431         revsh r5, r1
 432
 433 @ CHECK: rev    r6, r3                  @ encoding: [0x1e,0xba]
 434 @ CHECK: rev16  r7, r2                  @ encoding: [0x57,0xba]
 435 @ CHECK: revsh  r5, r1                  @ encoding: [0xcd,0xba]
 436
 437
 438 @------------------------------------------------------------------------------
 439 @ ROR
 440 @------------------------------------------------------------------------------
 441         rors r2, r7
 442
 443 @ CHECK: rors   r2, r7                  @ encoding: [0xfa,0x41]
 444
 445
 446 @------------------------------------------------------------------------------
 447 @ RSB
 448 @------------------------------------------------------------------------------
 449         rsbs r1, r3, #0
 450
 451 @ CHECK: rsbs   r1, r3, #0              @ encoding: [0x59,0x42]
 452
 453
 454 @------------------------------------------------------------------------------
 455 @ SBC
 456 @------------------------------------------------------------------------------
 457         sbcs r4, r3
 458
 459 @ CHECK: sbcs   r4, r3                  @ encoding: [0x9c,0x41]
 460
 461
 462 @------------------------------------------------------------------------------
 463 @ SETEND
 464 @------------------------------------------------------------------------------
 465         setend be
 466         setend le
 467
 468 @ CHECK: setend be                      @ encoding: [0x58,0xb6]
 469 @ CHECK: setend le                      @ encoding: [0x50,0xb6]
 470
 471
 472 @------------------------------------------------------------------------------
 473 @ STM
 474 @------------------------------------------------------------------------------
 475         stm r1!, {r2, r6}
 476         stm r1!, {r1, r2, r3, r7}
 477
 478 @ CHECK: stm    r1!, {r2, r6}           @ encoding: [0x44,0xc1]
 479 @ CHECK: stm    r1!, {r1, r2, r3, r7}   @ encoding: [0x8e,0xc1]
 480
 481
 482 @------------------------------------------------------------------------------
 483 @ STR (immediate)
 484 @------------------------------------------------------------------------------
 485         str r2, [r7]
 486         str r2, [r7, #0]
 487         str r5, [r1, #4]
 488         str r3, [r7, #124]
 489         str r2, [sp]
 490         str r3, [sp, #0]
 491         str r4, [sp, #20]
 492         str r5, [sp, #1020]
 493
 494 @ CHECK: str    r2, [r7]                @ encoding: [0x3a,0x60]
 495 @ CHECK: str    r2, [r7]                @ encoding: [0x3a,0x60]
 496 @ CHECK: str    r5, [r1, #4]            @ encoding: [0x4d,0x60]
 497 @ CHECK: str    r3, [r7, #124]          @ encoding: [0xfb,0x67]
 498 @ CHECK: str    r2, [sp]                @ encoding: [0x00,0x92]
 499 @ CHECK: str    r3, [sp]                @ encoding: [0x00,0x93]
 500 @ CHECK: str    r4, [sp, #20]           @ encoding: [0x05,0x94]
 501 @ CHECK: str    r5, [sp, #1020]         @ encoding: [0xff,0x95]
 502
 503
 504 @------------------------------------------------------------------------------
 505 @ STR (register)
 506 @------------------------------------------------------------------------------
 507         str r2, [r7, r3]
 508
 509 @ CHECK: str    r2, [r7, r3]            @ encoding: [0xfa,0x50]
 510
 511
 512 @------------------------------------------------------------------------------
 513 @ STRB (immediate)
 514 @------------------------------------------------------------------------------
 515         strb r4, [r3]
 516         strb r5, [r6, #0]
 517         strb r6, [r7, #31]
 518
 519 @ CHECK: strb   r4, [r3]                @ encoding: [0x1c,0x70]
 520 @ CHECK: strb   r5, [r6]                @ encoding: [0x35,0x70]
 521 @ CHECK: strb   r6, [r7, #31]           @ encoding: [0xfe,0x77]
 522
 523
 524 @------------------------------------------------------------------------------
 525 @ STRB (register)
 526 @------------------------------------------------------------------------------
 527         strb r6, [r4, r5]
 528
 529 @ CHECK: strb   r6, [r4, r5]            @ encoding: [0x66,0x55]
 530
 531
 532 @------------------------------------------------------------------------------
 533 @ STRH (immediate)
 534 @------------------------------------------------------------------------------
 535         strh r3, [r3]
 536         strh r4, [r6, #2]
 537         strh r5, [r7, #62]
 538
 539 @ CHECK: strh   r3, [r3]                @ encoding: [0x1b,0x80]
 540 @ CHECK: strh   r4, [r6, #2]            @ encoding: [0x74,0x80]
 541 @ CHECK: strh   r5, [r7, #62]           @ encoding: [0xfd,0x87]
 542
 543
 544 @------------------------------------------------------------------------------
 545 @ STRH (register)
 546 @------------------------------------------------------------------------------
 547         strh r6, [r2, r6]
 548
 549 @ CHECK: strh   r6, [r2, r6]            @ encoding: [0x96,0x53]
 550
 551
 552 @------------------------------------------------------------------------------
 553 @ SUB (immediate)
 554 @------------------------------------------------------------------------------
 555         subs r1, r2, #3
 556         subs r2, #3
 557         subs r2, #8
 558
 559 @ CHECK: subs   r1, r2, #3              @ encoding: [0xd1,0x1e]
 560 @ CHECK: subs   r2, #3                  @ encoding: [0x03,0x3a]
 561 @ CHECK: subs   r2, #8                  @ encoding: [0x08,0x3a]
 562
 563
 564 @------------------------------------------------------------------------------
 565 @ SUB (SP minus immediate)
 566 @------------------------------------------------------------------------------
 567         sub sp, #12
 568         sub sp, sp, #508
 569
 570 @ CHECK: sub    sp, #12                 @ encoding: [0x83,0xb0]
 571 @ CHECK: sub    sp, #508                @ encoding: [0xff,0xb0]
 572
 573
 574 @------------------------------------------------------------------------------
 575 @ SUB (register)
 576 @------------------------------------------------------------------------------
 577         subs r1, r2, r3
 578
 579 @ CHECK: subs   r1, r2, r3              @ encoding: [0xd1,0x1a]
 580
 581
 582 @------------------------------------------------------------------------------
 583 @ SVC
 584 @------------------------------------------------------------------------------
 585         svc #0
 586         svc #255
 587
 588 @ CHECK: svc    #0                      @ encoding: [0x00,0xdf]
 589 @ CHECK: svc    #255                    @ encoding: [0xff,0xdf]
 590
 591
 592 @------------------------------------------------------------------------------
 593 @ SXTB/SXTH
 594 @------------------------------------------------------------------------------
 595         sxtb r3, r5
 596         sxth r3, r5
 597
 598 @ CHECK: sxtb   r3, r5                  @ encoding: [0x6b,0xb2]
 599 @ CHECK: sxth   r3, r5                  @ encoding: [0x2b,0xb2]
 600
 601
 602 @------------------------------------------------------------------------------
 603 @ TST
 604 @------------------------------------------------------------------------------
 605         tst r6, r1
 606
 607 @ CHECK: tst    r6, r1                  @ encoding: [0x0e,0x42]
 608
 609
 610 @------------------------------------------------------------------------------
 611 @ UXTB/UXTH
 612 @------------------------------------------------------------------------------
 613         uxtb  r7, r2
 614         uxth  r1, r4
 615
 616 @ CHECK: uxtb   r7, r2                  @ encoding: [0xd7,0xb2]
 617 @ CHECK: uxth   r1, r4                  @ encoding: [0xa1,0xb2]
 618
 619
 620 @------------------------------------------------------------------------------
 621 @ WFE/WFI/YIELD
 622 @------------------------------------------------------------------------------
 623         wfe
 624         wfi
 625         yield
 626
 627 @ CHECK: wfe                             @ encoding: [0x20,0xbf]
 628 @ CHECK: wfi                             @ encoding: [0x30,0xbf]
 629 @ CHECK: yield                           @ encoding: [0x10,0xbf]