openpower/isa/fixedload.mdwn

   1 <!-- This defines instructions described in PowerISA Version 3.0 B Book 1 -->
   2
   3 <!-- This defines instructions that load from RAM to a register -->
   4
   5 <!-- Note that these pages also define equivalent store instructions, -->
   6 <!-- these are described in fixedstore.mdwn -->
   7
   8 <!-- Section 3.3.2 This defines the Fixed-Point Load Instructions pages 47 - 53 -->
   9 <!-- Section 3.3.3 Fixed-Point Store Instructions pages 54 - 56 -->
  10 <!-- Section 3.3.3.1 64-bit Fixed-Point Store Instructions pages 57 -->
  11 <!-- Section 3.3.4 Fixed Point Load and Store Quadword Instructions pages 58 - 59 -->
  12 <!-- Section 3.3.5 Fixed-Point Load and Store with Byte Reversal Instructions page 60 -->
  13 <!-- Section 3.3.5.1 64-Bit Load and Store with Byte Reversal Instructions page 61 -->
  14 <!-- Section 3.3.6 Fixed-Point Load and Store Multiple Instructions page 62 -->
  15
  16
  17
  18 <!-- Section 3.3.2 This defines the Fixed-Point Load Instructions pages 47 - 53 -->
  19
  20 <!-- The byte, halfword, word, or doubleword in storage addressed by EA is loaded -->
  21 <!-- into register RT. -->
  22
  23 <!-- Many of the Load instructions have an “update” form, in which register RA is -->
  24 <!-- updated with the effective address. For these forms, if RA!=0 and RA!=RT, the -->
  25 <!-- effective address is placed into register RA and the storage element (byte, -->
  26 <!-- halfword, word, or doubleword) addressed by EA is loaded into RT. -->
  27
  28
  29 # Load Byte and Zero
  30
  31 D-Form
  32
  33 * lbz RT,D(RA)
  34
  35 Pseudo-code:
  36
  37     b <- (RA|0)
  38     EA <- b + EXTS(D)
  39     RT <- ([0] * (XLEN-8)) || MEM(EA, 1)
  40
  41 Description:
  42
  43     Let the effective address (EA) be the sum (RA|0)+ D.
  44     The byte in storage addressed by EA is loaded into
  45     RT[56:63]. RT[0:55] are set to 0.
  46
  47 Special Registers Altered:
  48
  49     None
  50
  51 # Load Byte and Zero Indexed
  52
  53 X-Form
  54
  55 * lbzx RT,RA,RB
  56
  57 Pseudo-code:
  58
  59     b <- (RA|0)
  60     EA <- b + (RB)
  61     RT <- ([0] * (XLEN-8)) || MEM(EA, 1)
  62
  63 Description:
  64
  65     Let the effective address (EA) be the sum
  66     (RA|0)+ (RB). The byte in storage addressed by EA is
  67     loaded into RT[56:63] . RT[0:55] are set to 0.
  68
  69 Special Registers Altered:
  70
  71     None
  72
  73 # Load Byte and Zero with Update
  74
  75 D-Form
  76
  77 * lbzu RT,D(RA)
  78
  79 Pseudo-code:
  80
  81     EA <- (RA) + EXTS(D)
  82     RT <- ([0] * (XLEN-8)) || MEM(EA, 1)
  83     RA <- EA
  84
  85 Description:
  86
  87     Let the effective address (EA) be the sum (RA)+ D. The
  88     byte in storage addressed by EA is loaded into RT[56:63].
  89     RT[0:55] are set to 0.
  90
  91     EA is placed into register RA.
  92
  93     If RA=0 or RA=RT, the instruction form is invalid.
  94
  95 Special Registers Altered:
  96
  97     None
  98
  99 # Load Byte and Zero with Update Indexed
 100
 101 X-Form
 102
 103 * lbzux RT,RA,RB
 104
 105 Pseudo-code:
 106
 107     EA <- (RA) + (RB)
 108     RT <- ([0] * (XLEN-8)) || MEM(EA, 1)
 109     RA <- EA
 110
 111 Description:
 112
 113     Let the effective address (EA) be the sum (RA)+ (RB).
 114     The byte in storage addressed by EA is loaded into
 115     RT[56:63]. RT[0:55] are set to 0.
 116
 117     EA is placed into register RA.
 118
 119     If RA=0 or RA=RT, the instruction form is invalid.
 120
 121 Special Registers Altered:
 122
 123     None
 124
 125 # Load Halfword and Zero
 126
 127 D-Form
 128
 129 * lhz RT,D(RA)
 130
 131 Pseudo-code:
 132
 133     b <- (RA|0)
 134     EA <- b + EXTS(D)
 135     RT <- ([0] * (XLEN-16)) || MEM(EA, 2)
 136
 137 Description:
 138
 139     Let the effective address (EA) be the sum (RA|0)+ D.
 140     The halfword in storage addressed by EA is loaded into
 141     RT[48:63]. RT[0:47] are set to 0.
 142
 143 Special Registers Altered:
 144
 145     None
 146
 147 # Load Halfword and Zero Indexed
 148
 149 X-Form
 150
 151 * lhzx RT,RA,RB
 152
 153 Pseudo-code:
 154
 155     b <- (RA|0)
 156     EA <- b + (RB)
 157     RT <- ([0] * (XLEN-16)) || MEM(EA, 2)
 158
 159 Description:
 160
 161     Let the effective address (EA) be the sum
 162     (RA|0)+ (RB). The halfword in storage addressed by
 163     EA is loaded into RT 48:63. RT 0:47 are set to 0.
 164
 165 Special Registers Altered:
 166
 167     None
 168
 169 # Load Halfword and Zero with Update
 170
 171 D-Form
 172
 173 * lhzu RT,D(RA)
 174
 175 Pseudo-code:
 176
 177     EA <- (RA) + EXTS(D)
 178     RT <- ([0] * (XLEN-16)) || MEM(EA, 2)
 179     RA <- EA
 180
 181 Description:
 182
 183     Let the effective address (EA) be the sum (RA)+ D. The
 184     halfword in storage addressed by EA is loaded into
 185     RT[48:63]. RT[0:47] are set to 0.
 186
 187     EA is placed into register RA.
 188
 189     If RA=0 or RA=RT, the instruction form is invalid.
 190
 191 Special Registers Altered:
 192
 193     None
 194
 195 # Load Halfword and Zero with Update Indexed
 196
 197 X-Form
 198
 199 * lhzux RT,RA,RB
 200
 201 Pseudo-code:
 202
 203     EA <- (RA) + (RB)
 204     RT <- ([0] * (XLEN-16)) || MEM(EA, 2)
 205     RA <- EA
 206
 207 Description:
 208
 209     Let the effective address (EA) be the sum (RA)+ (RB).
 210     The halfword in storage addressed by EA is loaded into
 211     RT[48:63]. RT[0:47] are set to 0.
 212
 213     EA is placed into register RA.
 214
 215     If RA=0 or RA=RT, the instruction form is invalid.
 216
 217 Special Registers Altered:
 218
 219     None
 220
 221 # Load Halfword Algebraic
 222
 223 D-Form
 224
 225 * lha RT,D(RA)
 226
 227 Pseudo-code:
 228
 229     b <- (RA|0)
 230     EA <- b + EXTS(D)
 231     RT <- EXTS(MEM(EA, 2))
 232
 233 Description:
 234
 235     Let the effective address (EA) be the sum (RA|0)+ D.
 236     The halfword in storage addressed by EA is loaded into
 237     RT[48:63]. RT[0:47] are filled with a copy of bit 0 of the
 238     loaded halfword.
 239
 240 Special Registers Altered:
 241
 242     None
 243
 244 # Load Halfword Algebraic Indexed
 245
 246 X-Form
 247
 248 * lhax RT,RA,RB
 249
 250 Pseudo-code:
 251
 252     b <- (RA|0)
 253     EA <- b + (RB)
 254     RT <- EXTS(MEM(EA, 2))
 255
 256 Description:
 257
 258     Let the effective address (EA) be the sum
 259     (RA|0)+ (RB). The halfword in storage addressed by
 260     EA is loaded into RT[48:63] . RT[0:47] are filled with a copy
 261     of bit 0 of the loaded halfword.
 262
 263 Special Registers Altered:
 264
 265     None
 266
 267 # Load Halfword Algebraic with Update
 268
 269 D-Form
 270
 271 * lhau RT,D(RA)
 272
 273 Pseudo-code:
 274
 275     EA <- (RA) + EXTS(D)
 276     RT <- EXTS(MEM(EA, 2))
 277     RA <- EA
 278
 279 Description:
 280
 281     Let the effective address (EA) be the sum (RA)+ D. The
 282     halfword in storage addressed by EA is loaded into
 283     RT[48:63]. RT[0:47] are filled with a copy of bit 0 of the
 284     loaded halfword.
 285
 286     EA is placed into register RA.
 287
 288     If RA=0 or RA=RT, the instruction form is invalid.
 289
 290 Special Registers Altered:
 291
 292     None
 293
 294 # Load Halfword Algebraic with Update Indexed
 295
 296 X-Form
 297
 298 * lhaux RT,RA,RB
 299
 300 Pseudo-code:
 301
 302     EA <- (RA) + (RB)
 303     RT <- EXTS(MEM(EA, 2))
 304     RA <- EA
 305
 306 Description:
 307
 308     Let the effective address (EA) be the sum (RA)+ (RB).
 309     The halfword in storage addressed by EA is loaded into
 310     RT[48:63]. RT[0:47] are filled with a copy of bit 0 of the
 311     loaded halfword.
 312
 313     EA is placed into register RA.
 314
 315     If RA=0 or RA=RT, the instruction form is invalid.
 316
 317 Special Registers Altered:
 318
 319     None
 320
 321 # Load Word and Zero
 322
 323 D-Form
 324
 325 * lwz RT,D(RA)
 326
 327 Pseudo-code:
 328
 329     b <- (RA|0)
 330     EA <- b + EXTS(D)
 331     RT <- [0] * 32 || MEM(EA, 4)
 332
 333 Description:
 334     Let the effective address (EA) be the sum (RA|0)+ D.
 335     The word in storage addressed by EA is loaded into
 336     RT[32:63]. RT[0:31] are set to 0.
 337
 338 Special Registers Altered:
 339
 340     None
 341
 342 # Load Word and Zero Indexed
 343
 344 X-Form
 345
 346 * lwzx RT,RA,RB
 347
 348 Pseudo-code:
 349
 350     b <- (RA|0)
 351     EA <- b + (RB)
 352     RT <- [0] * 32 || MEM(EA, 4)
 353
 354 Description:
 355
 356     Let the effective address (EA) be the sum
 357     (RA|0)+ (RB). The word in storage addressed by EA is
 358     loaded into RT[32:63] . RT[0:31] are set to 0.
 359
 360 Special Registers Altered:
 361
 362     None
 363
 364 # Load Word and Zero with Update
 365
 366 D-Form
 367
 368 * lwzu RT,D(RA)
 369
 370 Pseudo-code:
 371
 372     EA <- (RA) + EXTS(D)
 373     RT <- [0]*32 || MEM(EA, 4)
 374     RA <- EA
 375
 376 Description:
 377
 378     Let the effective address (EA) be the sum (RA)+ D. The
 379     word in storage addressed by EA is loaded into
 380     RT[32:63]. RT[0:31] are set to 0.
 381
 382     EA is placed into register RA.
 383
 384     If RA=0 or RA=RT, the instruction form is invalid.
 385
 386 Special Registers Altered:
 387
 388     None
 389
 390 # Load Word and Zero with Update Indexed
 391
 392 X-Form
 393
 394 * lwzux RT,RA,RB
 395
 396 Pseudo-code:
 397
 398     EA <- (RA) + (RB)
 399     RT <- [0] * 32 || MEM(EA, 4)
 400     RA <- EA
 401
 402 Description:
 403
 404     Let the effective address (EA) be the sum (RA)+ (RB).
 405     The word in storage addressed by EA is loaded into
 406     RT[32:63]. RT[0:31] are set to 0.
 407
 408     EA is placed into register RA.
 409
 410     If RA=0 or RA=RT, the instruction form is invalid.
 411
 412 Special Registers Altered:
 413
 414     None
 415
 416 # Load Word Algebraic
 417
 418 DS-Form
 419
 420 * lwa RT,DS(RA)
 421
 422 Pseudo-code:
 423
 424     b <- (RA|0)
 425     EA <- b + EXTS(DS || 0b00)
 426     RT <- EXTS(MEM(EA, 4))
 427
 428 Special Registers Altered:
 429
 430     None
 431
 432 # Load Word Algebraic Indexed
 433
 434 X-Form
 435
 436 * lwax RT,RA,RB
 437
 438 Pseudo-code:
 439
 440     b <- (RA|0)
 441     EA <- b + (RB)
 442     RT <- EXTS(MEM(EA, 4))
 443
 444 Special Registers Altered:
 445
 446     None
 447
 448 # Load Word Algebraic with Update Indexed
 449
 450 X-Form
 451
 452 * lwaux RT,RA,RB
 453
 454 Pseudo-code:
 455
 456     EA <- (RA) + (RB)
 457     RT <- EXTS(MEM(EA, 4))
 458     RA <- EA
 459
 460 Special Registers Altered:
 461
 462     None
 463
 464 # Load Doubleword
 465
 466 DS-Form
 467
 468 * ld RT,DS(RA)
 469
 470 Pseudo-code:
 471
 472     b <- (RA|0)
 473     EA <- b + EXTS(DS || 0b00)
 474     RT <- MEM(EA, 8)
 475
 476 Special Registers Altered:
 477
 478     None
 479
 480 # Load Doubleword Indexed
 481
 482 X-Form
 483
 484 * ldx RT,RA,RB
 485
 486 Pseudo-code:
 487
 488     b <- (RA|0)
 489     EA <- b + (RB)
 490     RT <- MEM(EA, 8)
 491
 492 Special Registers Altered:
 493
 494     None
 495
 496 # Load Doubleword with Update Indexed
 497
 498 DS-Form
 499
 500 * ldu RT,DS(RA)
 501
 502 Pseudo-code:
 503
 504     EA <- (RA) + EXTS(DS || 0b00)
 505     RT <- MEM(EA, 8)
 506     RA <- EA
 507
 508 Special Registers Altered:
 509
 510     None
 511
 512 # Load Doubleword with Update Indexed
 513
 514 X-Form
 515
 516 * ldux RT,RA,RB
 517
 518 Pseudo-code:
 519
 520     EA <- (RA) + (RB)
 521     RT <- MEM(EA, 8)
 522     RA <- EA
 523
 524 Special Registers Altered:
 525
 526     None
 527
 528 <!-- Section 3.3.3 Fixed-Point Store Instructions pages 54 - 56 -->
 529
 530 <!-- The contents of register RS are stored into the byte, halfword, word, or -->
 531 <!-- doubleword in storage addressed by EA. -->
 532
 533 <!-- Many of the Store instructions have an “update” form, in which register RA is -->
 534 <!-- updated with the effective address. For these forms, the following rules apply. -->
 535
 536 <!-- If RA!=0, the effective address is placed into register RA. -->
 537
 538 <!-- If RS=RA, the contents of register RS are copied to the target storage element -->
 539 <!-- and then EA is placed into RA (RS). -->
 540
 541 <!-- Section 3.3.3.1 64-bit Fixed-Point Store Instructions pages 57 -->
 542
 543 <!-- Section 3.3.4 Fixed Point Load and Store Quadword Instructions pages 58 - 59 -->
 544
 545 <!-- For lq, the quadword in storage addressed by EA is loaded into an even-odd pair -->
 546 <!-- of GPRs as follows. In Big-Endian mode, the even-numbered GPR is loaded with -->
 547 <!-- the doubleword from storage addressed by EA and the odd-numbered GPR is loaded -->
 548 <!-- with the doubleword addressed by EA+8. In Little-Endian mode, the even-numbered -->
 549 <!-- GPR is loaded with the byte-reversed doubleword from storage addressed by EA+8 -->
 550 <!-- and the odd-numbered GPR is loaded with the byte-reversed doubleword addressed -->
 551 <!-- by EA. -->
 552
 553 # Load Quadword
 554
 555 DQ-Form
 556
 557 * lq RTp,DQ(RA)
 558
 559 Pseudo-code:
 560
 561     b <- (RA|0)
 562     EA <- b + EXTS(DQ || 0b0000)
 563     RTp <- MEM(EA, 16)
 564
 565 Special Registers Altered:
 566
 567     None
 568
 569 <!-- Section 3.3.5 Fixed-Point Load and Store with Byte Reversal Instructions page 60 -->
 570
 571 # Load Halfword Byte-Reverse Indexed
 572
 573 X-Form
 574
 575 * lhbrx RT,RA,RB
 576
 577 Pseudo-code:
 578
 579     b <- (RA|0)
 580     EA <- b + (RB)
 581     load_data <- MEM(EA, 2)
 582     RT <- [0]*48 || load_data[8:15] || load_data[0:7]
 583
 584 Special Registers Altered:
 585
 586     None
 587
 588 # Load Word Byte-Reverse Indexed
 589
 590 X-Form
 591
 592 * lwbrx RT,RA,RB
 593
 594 Pseudo-code:
 595
 596     b <- (RA|0)
 597     EA <- b + (RB)
 598     load_data <- MEM(EA, 4)
 599     RT <- ([0] * 32 || load_data[24:31] || load_data[16:23]
 600                     || load_data[8:15]  || load_data[0:7])
 601
 602 Special Registers Altered:
 603
 604     None
 605
 606
 607 <!-- Section 3.3.5.1 64-Bit Load and Store with Byte Reversal Instructions page 61 -->
 608
 609 # Load Doubleword Byte-Reverse Indexed
 610
 611 X-Form
 612
 613 * ldbrx RT,RA,RB
 614
 615 Pseudo-code:
 616
 617     b <- (RA|0)
 618     EA <- b + (RB)
 619     load_data <- MEM(EA, 8)
 620     RT <- (load_data[56:63] || load_data[48:55]
 621         || load_data[40:47] || load_data[32:39]
 622         || load_data[24:31] || load_data[16:23]
 623         || load_data[8:15]  || load_data[0:7])
 624
 625 Special Registers Altered:
 626
 627     None
 628
 629 <!-- Section 3.3.6 Fixed-Point Load and Store Multiple Instructions page 62 -->
 630
 631 # Load Multiple Word
 632
 633 DQ-Form
 634
 635 * lmw RT,D(RA)
 636
 637 Pseudo-code:
 638
 639     b <- (RA|0)
 640     EA <- b + EXTS(D)
 641     r <- RT[0:63]
 642     do while r <=  31
 643         GPR(r) <- [0]*32 || MEM(EA, 4)
 644         r <- r + 1
 645         EA <- EA + 4
 646
 647 Special Registers Altered:
 648
 649     None
 650