src/soc/sv/trans/svp64.py

   1 # SPDX-License-Identifier: LGPLv3+
   2 # Copyright (C) 2021 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   3 # Funded by NLnet http://nlnet.nl
   4
   5 """SVP64 OpenPOWER v3.0B assembly translator
   6
   7 This class takes raw svp64 assembly mnemonics (aliases excluded) and
   8 creates an EXT001-encoded "svp64 prefix" followed by a v3.0B opcode.
   9
  10 It is very simple and straightforward, the only weirdness being the
  11 extraction of the register information and conversion to v3.0B numbering.
  12
  13 Encoding format of svp64: https://libre-soc.org/openpower/sv/svp64/
  14 Bugtracker: https://bugs.libre-soc.org/show_bug.cgi?id=578
  15 """
  16
  17 import os, sys
  18 from collections import OrderedDict
  19
  20 from soc.decoder.pseudo.pagereader import ISA
  21 from soc.decoder.power_svp64 import SVP64RM, get_regtype, decode_extra
  22
  23
  24 # decode GPR into sv extra
  25 def  get_extra_gpr(etype, regmode, field):
  26     if regmode == 'scalar':
  27         # cut into 2-bits 5-bits SS FFFFF
  28         sv_extra = field >> 5
  29         field = field & 0b11111
  30     else:
  31         # cut into 5-bits 2-bits FFFFF SS
  32         sv_extra = field & 0b11
  33         field = field >> 2
  34     return sv_extra, field
  35
  36
  37 # decode 3-bit CR into sv extra
  38 def  get_extra_cr_3bit(etype, regmode, field):
  39     if regmode == 'scalar':
  40         # cut into 2-bits 3-bits SS FFF
  41         sv_extra = field >> 3
  42         field = field & 0b111
  43     else:
  44         # cut into 3-bits 4-bits FFF SSSS but will cut 2 zeros off later
  45         sv_extra = field & 0b1111
  46         field = field >> 4
  47     return sv_extra, field
  48
  49
  50 # decodes SUBVL
  51 def decode_subvl(encoding):
  52     pmap = {'2': 0b01, '3': 0b10, '4': 0b11}
  53     assert encoding in pmap, \
  54         "encoding %s for SUBVL not recognised" % encoding
  55     return pmap[encoding]
  56
  57
  58 # decodes elwidth
  59 def decode_elwidth(encoding):
  60     pmap = {'8': 0b11, '16': 0b10, '32': 0b01}
  61     assert encoding in pmap, \
  62         "encoding %s for elwidth not recognised" % encoding
  63     return pmap[encoding]
  64
  65
  66 # decodes predicate register encoding
  67 def decode_predicate(encoding):
  68     pmap = { # integer
  69             '1<<r3': (0, 0b001),
  70             'r3'   : (0, 0b010),
  71             '~r3'   : (0, 0b011),
  72             'r10'   : (0, 0b100),
  73             '~r10'  : (0, 0b101),
  74             'r30'   : (0, 0b110),
  75             '~r30'  : (0, 0b111),
  76             # CR
  77             'lt'    : (1, 0b000),
  78             'nl'    : (1, 0b001), 'ge'    : (1, 0b001), # same value
  79             'gt'    : (1, 0b010),
  80             'ng'    : (1, 0b011), 'le'    : (1, 0b011), # same value
  81             'eq'    : (1, 0b100),
  82             'ne'    : (1, 0b101),
  83             'so'    : (1, 0b110), 'un'    : (1, 0b110), # same value
  84             'ns'    : (1, 0b111), 'nu'    : (1, 0b111), # same value
  85            }
  86     assert encoding in pmap, \
  87         "encoding %s for predicate not recognised" % encoding
  88     return pmap[encoding]
  89
  90
  91 # decodes "Mode" in similar way to BO field (supposed to, anyway)
  92 def decode_bo(encoding):
  93     pmap = { # TODO: double-check that these are the same as Branch BO
  94             'lt'    : 0b000,
  95             'nl'    : 0b001, 'ge'    : 0b001, # same value
  96             'gt'    : 0b010,
  97             'ng'    : 0b011, 'le'    : 0b011, # same value
  98             'eq'    : 0b100,
  99             'ne'    : 0b101,
 100             'so'    : 0b110, 'un'    : 0b110, # same value
 101             'ns'    : 0b111, 'nu'    : 0b111, # same value
 102            }
 103     assert encoding in pmap, \
 104         "encoding %s for BO Mode not recognised" % encoding
 105     return pmap[encoding]
 106
 107 # partial-decode fail-first mode
 108 def decode_ffirst(encoding):
 109     if encoding in ['RC1', '~RC1']:
 110         return encoding
 111     return decode_bo(encoding)
 112
 113
 114 # decodes svp64 assembly listings and creates EXT001 svp64 prefixes
 115 class SVP64Asm:
 116     def __init__(self, lst):
 117         self.lst = lst
 118         self.trans = self.translate(lst)
 119
 120     def __iter__(self):
 121         yield from self.trans
 122
 123     def translate(self, lst):
 124         isa = ISA() # reads the v3.0B pseudo-code markdown files
 125         svp64 = SVP64RM() # reads the svp64 Remap entries for registers
 126         for insn in lst:
 127             # find first space, to get opcode
 128             ls = insn.split(' ')
 129             opcode = ls[0]
 130             # now find opcode fields
 131             fields = ''.join(ls[1:]).split(',')
 132             fields = list(map(str.strip, fields))
 133             print ("opcode, fields", ls, opcode, fields)
 134
 135             # identify if is a svp64 mnemonic
 136             if not opcode.startswith('sv.'):
 137                 yield insn  # unaltered
 138                 continue
 139             opcode = opcode[3:] # strip leading "sv."
 140
 141             # start working on decoding the svp64 op: sv.basev30Bop/vec2/mode
 142             opmodes = opcode.split("/") # split at "/"
 143             v30b_op = opmodes.pop(0)    # first is the v3.0B
 144             # check instruction ends with dot
 145             rc_mode = v30b_op.endswith('.')
 146             if rc_mode:
 147                 v30b_op = v30b_op[:-1]
 148
 149             if v30b_op not in isa.instr:
 150                 raise Exception("opcode %s of '%s' not supported" % \
 151                                 (v30b_op, insn))
 152             if v30b_op not in svp64.instrs:
 153                 raise Exception("opcode %s of '%s' not an svp64 instruction" % \
 154                                 (v30b_op, insn))
 155             v30b_regs = isa.instr[v30b_op].regs[0] # get regs info "RT, RA, RB"
 156             rm = svp64.instrs[v30b_op]             # one row of the svp64 RM CSV
 157             print ("v3.0B op", v30b_op, "Rc=1" if rc_mode else '')
 158             print ("v3.0B regs", opcode, v30b_regs)
 159             print (rm)
 160
 161             # right.  the first thing to do is identify the ordering of
 162             # the registers, by name.  the EXTRA2/3 ordering is in
 163             # rm['0']..rm['3'] but those fields contain the names RA, BB
 164             # etc.  we have to read the pseudocode to understand which
 165             # reg is which in our instruction. sigh.
 166
 167             # first turn the svp64 rm into a "by name" dict, recording
 168             # which position in the RM EXTRA it goes into
 169             # also: record if the src or dest was a CR, for sanity-checking
 170             # (elwidth overrides on CRs are banned)
 171             decode = decode_extra(rm)
 172             dest_reg_cr, src_reg_cr, svp64_src, svp64_dest = decode
 173             svp64_reg_byname = {}
 174             svp64_reg_byname.update(svp64_src)
 175             svp64_reg_byname.update(svp64_dest)
 176
 177             print ("EXTRA field index, by regname", svp64_reg_byname)
 178
 179             # okaaay now we identify the field value (opcode N,N,N) with
 180             # the pseudo-code info (opcode RT, RA, RB)
 181             assert len(fields) == len(v30b_regs), \
 182                 "length of fields %s must match insn `%s`" % \
 183                         (str(v30b_regs), insn)
 184             opregfields = zip(fields, v30b_regs) # err that was easy
 185
 186             # now for each of those find its place in the EXTRA encoding
 187             extras = OrderedDict()
 188             for idx, (field, regname) in enumerate(opregfields):
 189                 extra = svp64_reg_byname.get(regname, None)
 190                 regtype = get_regtype(regname)
 191                 extras[extra] = (idx, field, regname, regtype)
 192                 print ("    ", extra, extras[extra])
 193
 194             # great! got the extra fields in their associated positions:
 195             # also we know the register type. now to create the EXTRA encodings
 196             etype = rm['Etype'] # Extra type: EXTRA3/EXTRA2
 197             ptype = rm['Ptype'] # Predication type: Twin / Single
 198             extra_bits = 0
 199             v30b_newfields = []
 200             for extra_idx, (idx, field, regname, regtype) in extras.items():
 201                 # is it a field we don't alter/examine?  if so just put it
 202                 # into newfields
 203                 if regtype is None:
 204                     v30b_newfields.append(field)
 205
 206                 # first, decode the field number. "5.v" or "3.s" or "9"
 207                 field = field.split(".")
 208                 regmode = 'scalar' # default
 209                 if len(field) == 2:
 210                     if field[1] == 's':
 211                         regmode = 'scalar'
 212                     elif field[1] == 'v':
 213                         regmode = 'vector'
 214                 field = int(field[0]) # actual register number
 215                 print ("    ", regmode, field, end=" ")
 216
 217                 # XXX TODO: the following is a bit of a laborious repeated
 218                 # mess, which could (and should) easily be parameterised.
 219
 220                 # encode SV-GPR field into extra, v3.0field
 221                 if regtype == 'GPR':
 222                     sv_extra, field = get_extra_gpr(etype, regmode, field)
 223                     # now sanity-check. EXTRA3 is ok, EXTRA2 has limits
 224                     # (and shrink to a single bit if ok)
 225                     if etype == 'EXTRA2':
 226                         if regmode == 'scalar':
 227                             # range is r0-r63 in increments of 1
 228                             assert (sv_extra >> 1) == 0, \
 229                                 "scalar GPR %s cannot fit into EXTRA2 %s" % \
 230                                     (regname, str(extras[extra_idx]))
 231                             # all good: encode as scalar
 232                             sv_extra = sv_extra & 0b01
 233                         else:
 234                             # range is r0-r127 in increments of 4
 235                             assert sv_extra & 0b01 == 0, \
 236                                 "vector field %s cannot fit into EXTRA2 %s" % \
 237                                     (regname, str(extras[extra_idx]))
 238                             # all good: encode as vector (bit 2 set)
 239                             sv_extra = 0b10 | (sv_extra >> 1)
 240                     elif regmode == 'vector':
 241                         # EXTRA3 vector bit needs marking
 242                         sv_extra |= 0b100
 243
 244                 # encode SV-CR 3-bit field into extra, v3.0field
 245                 elif regtype == 'CR_3bit':
 246                     sv_extra, field = get_extra_cr_3bit(etype, regmode, field)
 247                     # now sanity-check (and shrink afterwards)
 248                     if etype == 'EXTRA2':
 249                         if regmode == 'scalar':
 250                             # range is CR0-CR15 in increments of 1
 251                             assert (sv_extra >> 1) == 0, \
 252                                 "scalar CR %s cannot fit into EXTRA2 %s" % \
 253                                     (regname, str(extras[extra_idx]))
 254                             # all good: encode as scalar
 255                             sv_extra = sv_extra & 0b01
 256                         else:
 257                             # range is CR0-CR127 in increments of 16
 258                             assert sv_extra & 0b111 == 0, \
 259                                 "vector CR %s cannot fit into EXTRA2 %s" % \
 260                                     (regname, str(extras[extra_idx]))
 261                             # all good: encode as vector (bit 2 set)
 262                             sv_extra = 0b10 | (sv_extra >> 3)
 263                     else:
 264                         if regmode == 'scalar':
 265                             # range is CR0-CR31 in increments of 1
 266                             assert (sv_extra >> 2) == 0, \
 267                                 "scalar CR %s cannot fit into EXTRA2 %s" % \
 268                                     (regname, str(extras[extra_idx]))
 269                             # all good: encode as scalar
 270                             sv_extra = sv_extra & 0b11
 271                         else:
 272                             # range is CR0-CR127 in increments of 8
 273                             assert sv_extra & 0b11 == 0, \
 274                                 "vector CR %s cannot fit into EXTRA2 %s" % \
 275                                     (regname, str(extras[extra_idx]))
 276                             # all good: encode as vector (bit 3 set)
 277                             sv_extra = 0b100 | (sv_extra >> 2)
 278
 279                 # encode SV-CR 5-bit field into extra, v3.0field
 280                 # *sigh* this is the same as 3-bit except the 2 LSBs are
 281                 # passed through
 282                 elif regtype == 'CR_5bit':
 283                     cr_subfield = field & 0b11
 284                     field = field >> 2 # strip bottom 2 bits
 285                     sv_extra, field = get_extra_cr_3bit(etype, regmode, field)
 286                     # now sanity-check (and shrink afterwards)
 287                     if etype == 'EXTRA2':
 288                         if regmode == 'scalar':
 289                             # range is CR0-CR15 in increments of 1
 290                             assert (sv_extra >> 1) == 0, \
 291                                 "scalar CR %s cannot fit into EXTRA2 %s" % \
 292                                     (regname, str(extras[extra_idx]))
 293                             # all good: encode as scalar
 294                             sv_extra = sv_extra & 0b01
 295                         else:
 296                             # range is CR0-CR127 in increments of 16
 297                             assert sv_extra & 0b111 == 0, \
 298                                 "vector CR %s cannot fit into EXTRA2 %s" % \
 299                                     (regname, str(extras[extra_idx]))
 300                             # all good: encode as vector (bit 2 set)
 301                             sv_extra = 0b10 | (sv_extra >> 3)
 302                     else:
 303                         if regmode == 'scalar':
 304                             # range is CR0-CR31 in increments of 1
 305                             assert (sv_extra >> 2) == 0, \
 306                                 "scalar CR %s cannot fit into EXTRA2 %s" % \
 307                                     (regname, str(extras[extra_idx]))
 308                             # all good: encode as scalar
 309                             sv_extra = sv_extra & 0b11
 310                         else:
 311                             # range is CR0-CR127 in increments of 8
 312                             assert sv_extra & 0b11 == 0, \
 313                                 "vector CR %s cannot fit into EXTRA2 %s" % \
 314                                     (regname, str(extras[extra_idx]))
 315                             # all good: encode as vector (bit 3 set)
 316                             sv_extra = 0b100 | (sv_extra >> 2)
 317
 318                     # reconstruct the actual 5-bit CR field
 319                     field = (field << 2) | cr_subfield
 320
 321                 # capture the extra field info
 322                 print ("=>", "%5s" % bin(sv_extra), field)
 323                 extras[extra_idx] = sv_extra
 324
 325                 # append altered field value to v3.0b
 326                 v30b_newfields.append(str(field))
 327
 328             print ("new v3.0B fields", v30b_op, v30b_newfields)
 329             print ("extras", extras)
 330
 331             # rright.  now we have all the info. start creating SVP64 RM
 332             svp64_rm = 0b0
 333
 334             # begin with EXTRA fields
 335             for idx, sv_extra in extras.items():
 336                 if idx is None: continue
 337                 # start at bit 10, work up 2/3 times EXTRA idx
 338                 offs = 2 if etype == 'EXTRA2' else 3 # 2 or 3 bits
 339                 svp64_rm |= sv_extra << (10+idx*offs)
 340
 341             # parts of svp64_rm
 342             mmode = 0  # bit 0
 343             pmask = 0  # bits 1-3
 344             destwid = 0 # bits 4-5
 345             srcwid = 0 # bits 6-7
 346             subvl = 0   # bits 8-9
 347             smask = 0 # bits 16-18 but only for twin-predication
 348             mode = 0 # bits 19-23
 349
 350             has_pmask = False
 351             has_smask = False
 352
 353             saturation = None
 354             src_zero = 0
 355             dst_zero = 0
 356             sv_mode = None
 357
 358             mapreduce = False
 359             mapreduce_crm = False
 360             mapreduce_svm = False
 361
 362             predresult = False
 363             failfirst = False
 364
 365             # ok let's start identifying opcode augmentation fields
 366             for encmode in opmodes:
 367                 # predicate mask (dest)
 368                 if encmode.startswith("m="):
 369                     pme = encmode
 370                     pmmode, pmask = decode_predicate(encmode[2:])
 371                     mmode = pmmode
 372                     has_pmask = True
 373                 # predicate mask (src, twin-pred)
 374                 elif encmode.startswith("sm="):
 375                     sme = encmode
 376                     smmode, smask = decode_predicate(encmode[3:])
 377                     mmode = smmode
 378                     has_smask = True
 379                 # vec2/3/4
 380                 elif encmode.startswith("vec"):
 381                     subvl = decode_subvl(encmode[3:])
 382                 # elwidth
 383                 elif encmode.startswith("ew="):
 384                     destwid = decode_elwidth(encmode[3:])
 385                 elif encmode.startswith("sw="):
 386                     srcwid = decode_elwidth(encmode[3:])
 387                 # saturation
 388                 elif encmode == 'sats':
 389                     assert sv_mode is None
 390                     saturation = 1
 391                     sv_mode = 0b10
 392                 elif encmode == 'satu':
 393                     assert sv_mode is None
 394                     sv_mode = 0b10
 395                     saturation = 0
 396                 # predicate zeroing
 397                 elif encmode == 'sz':
 398                     src_zero = 1
 399                 elif encmode == 'dz':
 400                     dst_zero = 1
 401                 # failfirst
 402                 elif encmode.startswith("ff="):
 403                     assert sv_mode is None
 404                     sv_mode = 0b01
 405                     failfirst = decode_ffirst(encmode[3:])
 406                 # predicate-result, interestingly same as fail-first
 407                 elif encmode.startswith("pr="):
 408                     assert sv_mode is None
 409                     sv_mode = 0b11
 410                     predresult = decode_ffirst(encmode[3:])
 411                 # map-reduce mode
 412                 elif encmode == 'mr':
 413                     assert sv_mode is None
 414                     sv_mode = 0b00
 415                     mapreduce = True
 416                 elif encmode == 'crm': # CR on map-reduce
 417                     assert sv_mode is None
 418                     sv_mode = 0b00
 419                     mapreduce_crm = True
 420                 elif encmode == 'svm': # sub-vector mode
 421                     mapreduce_svm = True
 422
 423             # sanity-check that 2Pred mask is same mode
 424             if has_pmask and has_smask:
 425                 assert smmode == pmmode, \
 426                     "predicate masks %s and %s must be same reg type" % \
 427                         (pme, sme)
 428
 429             # sanity-check that twin-predication mask only specified in 2P mode
 430             if ptype == '1P':
 431                 assert has_smask == False, \
 432                     "source-mask can only be specified on Twin-predicate ops"
 433
 434             # construct the mode field, doing sanity-checking along the way
 435
 436             if mapreduce_svm:
 437                 assert sv_mode == 0b00, "sub-vector mode in mapreduce only"
 438                 assert subvl != 0, "sub-vector mode not possible on SUBVL=1"
 439
 440             if src_zero:
 441                 assert has_smask, "src zeroing requires a source predicate"
 442             if dst_zero:
 443                 assert has_pmask, "dest zeroing requires a dest predicate"
 444
 445             # "normal" mode
 446             if sv_mode is None:
 447                 mode |= (src_zero << 3) | (dst_zero << 4) # predicate zeroing
 448                 sv_mode = 0b00
 449
 450             # "mapreduce" modes
 451             elif sv_mode == 0b00:
 452                 mode |= (0b1<<2) # sets mapreduce
 453                 assert dst_zero == 0, "dest-zero not allowed in mapreduce mode"
 454                 if mapreduce_crm:
 455                     mode |= (0b1<<4) # sets CRM mode
 456                     assert rc_mode, "CRM only allowed when Rc=1"
 457                 # bit of weird encoding to jam zero-pred or SVM mode in.
 458                 # SVM mode can be enabled only when SUBVL=2/3/4 (vec2/3/4)
 459                 if subvl == 0:
 460                     mode |= (src_zero << 3) # predicate src-zeroing
 461                 elif mapreduce_svm:
 462                     mode |= (1 << 3) # SVM mode
 463
 464             # "failfirst" modes
 465             elif sv_mode == 0b01:
 466                 assert dst_zero == 0, "dest-zero not allowed in failfirst mode"
 467                 if failfirst == 'RC1':
 468                     mode |= (0b1<<4) # sets RC1 mode
 469                     mode |= (src_zero << 3) # predicate src-zeroing
 470                     assert rc_mode==False, "ffirst RC1 only possible when Rc=0"
 471                 elif failfirst == '~RC1':
 472                     mode |= (0b1<<4) # sets RC1 mode...
 473                     mode |= (src_zero << 3) # predicate src-zeroing
 474                     mode |= (0b1<<2) # ... with inversion
 475                     assert rc_mode==False, "ffirst RC1 only possible when Rc=0"
 476                 else:
 477                     assert src_zero == 0, "src-zero not allowed in ffirst BO"
 478                     assert rc_mode, "ffirst BO only possible when Rc=1"
 479                     mode |= (failfirst << 2) # set BO
 480
 481             # "saturation" modes
 482             elif sv_mode == 0b10:
 483                 mode |= (src_zero << 3) | (dst_zero << 4) # predicate zeroing
 484                 mode |= (saturation<<2) # sets signed/unsigned saturation
 485
 486             # "predicate-result" modes.  err... code-duplication from ffirst
 487             elif sv_mode == 0b11:
 488                 assert dst_zero == 0, "dest-zero not allowed in predresult mode"
 489                 if predresult == 'RC1':
 490                     mode |= (0b1<<4) # sets RC1 mode
 491                     mode |= (src_zero << 3) # predicate src-zeroing
 492                     assert rc_mode==False, "pr-mode RC1 only possible when Rc=0"
 493                 elif predresult == '~RC1':
 494                     mode |= (0b1<<4) # sets RC1 mode...
 495                     mode |= (src_zero << 3) # predicate src-zeroing
 496                     mode |= (0b1<<2) # ... with inversion
 497                     assert rc_mode==False, "pr-mode RC1 only possible when Rc=0"
 498                 else:
 499                     assert src_zero == 0, "src-zero not allowed in pr-mode BO"
 500                     assert rc_mode, "pr-mode BO only possible when Rc=1"
 501                     mode |= (predresult << 2) # set BO
 502
 503             # whewww.... modes all done :)
 504             # now put into svp64_rm
 505             mode |= sv_mode
 506             svp64_rm |= (mode << 19) # mode: bits 19-23
 507
 508             # put in predicate masks into svp64_rm
 509             if ptype == '2P':
 510                 svp64_rm |= (smask << 16) # source pred: bits 16-18
 511             svp64_rm |= (mmode)           # mask mode: bit 0
 512             svp64_rm |= (pmask << 1)      # 1-pred: bits 1-3
 513
 514             # and subvl
 515             svp64_rm += (subvl << 8)      # subvl: bits 8-9
 516
 517             # put in elwidths
 518             svp64_rm += (srcwid << 6)      # srcwid: bits 6-7
 519             svp64_rm += (destwid << 4)     # destwid: bits 4-5
 520
 521             # nice debug printout. (and now for something completely different)
 522             # https://youtu.be/u0WOIwlXE9g?t=146
 523             print ("svp64_rm", hex(svp64_rm), bin(svp64_rm))
 524             print ("    mmode  0    :", bin(mmode))
 525             print ("    pmask  1-3  :", bin(pmask))
 526             print ("    dstwid 4-5  :", bin(destwid))
 527             print ("    srcwid 6-7  :", bin(srcwid))
 528             print ("    subvl  8-9  :", bin(subvl))
 529             print ("    mode   19-23:", bin(mode))
 530             offs = 2 if etype == 'EXTRA2' else 3 # 2 or 3 bits
 531             for idx, sv_extra in extras.items():
 532                 if idx is None: continue
 533                 start = (10+idx*offs)
 534                 end = start + offs-1
 535                 print ("    extra%d %2d-%2d:" % (idx, start, end),
 536                         bin(sv_extra))
 537             if ptype == '2P':
 538                 print ("    smask  16-17:", bin(smask))
 539             print ()
 540
 541             # first construct the prefix: EXT001, bits 7/9=1, in MSB0 order
 542             svp64_prefix = 0x1 << (31-5) # EXT001
 543             svp64_prefix |= 0x1 << (31-7) # SVP64 marker 1
 544             svp64_prefix |= 0x1 << (31-9) # SVP64 marker 2
 545             rmfields = [6, 8] + list(range(10,32)) # SVP64 24-bit RM
 546             for i, x in enumerate(rmfields):
 547                 svp64_prefix |= ((svp64_rm>>i)&0b1) << (31-x)
 548
 549             # fiinally yield the svp64 prefix and the thingy.  v3.0b opcode
 550             yield ".long 0x%x" % svp64_prefix
 551             yield "%s %s" % (v30b_op, ", ".join(v30b_newfields))
 552             print ("new v3.0B fields", v30b_op, v30b_newfields)
 553
 554 if __name__ == '__main__':
 555     isa = SVP64Asm(['slw 3, 1, 4',
 556                  'extsw 5, 3',
 557                  'sv.extsw 5, 3',
 558                  'sv.cmpi 5, 1, 3, 2',
 559                  'sv.setb 5, 31',
 560                  'sv.isel 64.v, 3, 2, 65.v',
 561                  'sv.setb/m=r3/sm=1<<r3 5, 31',
 562                  'sv.setb/vec2 5, 31',
 563                  'sv.setb/sw=8/ew=16 5, 31',
 564                  'sv.extsw./ff=eq 5, 31',
 565                  'sv.extsw./satu/sz/dz/sm=r3/m=r3 5, 31',
 566                  'sv.extsw./pr=eq 5.v, 31',
 567                 ])
 568     print ("list", list(isa))
 569     csvs = SVP64RM()