ST20_adc:           "add constant"
ST20_add:           "add"
ST20_addc:          "add with carry"
ST20_ajw:           "adjust work space"
ST20_and:           "and"
ST20_arot:          "anti-rotate stack"
ST20_ashr:          "arithmetic shift right"
ST20_biquad:        "biquad IIR filter step"
ST20_bitld:         "load bit"
ST20_bitmask:       "create bit mask"
ST20_bitst:         "store bit"
ST20_breakpoint:    "breakpoint"
ST20_cj:            "conditional jump"
ST20_dequeue:       "dequeue a process"
ST20_divstep:       "divide step"
ST20_dup:           "duplicate"
ST20_ecall:         "exception call"
ST20_enqueue:       "enqueue a process"
ST20_eqc:           "equals constant"
ST20_eret:          "exception return"
ST20_fcall:         "function call"
ST20_gajw:          "general adjust workspace"
ST20_gt:            "greater than"
ST20_gtu:           "greater than unsigned"
ST20_io:            "input/output"
ST20_j:             "jump"
ST20_jab:           "jump absolute"
ST20_lbinc:         "load byte and increment"
ST20_ldc:           "load constant"
ST20_ldl:           "load local"
ST20_ldlp:          "load local pointer"
ST20_ldnl:          "load non-local"
ST20_ldnlp:         "load non-local pointer"
ST20_ldpi:          "load pointer to instruction"
ST20_ldprodid:      "load product identity"
ST20_ldtdesc:       "load task descriptor"
ST20_lsinc:         "load sixteen and increment"
ST20_lsxinc:        "load sixteen sign extended and increment"
ST20_lwinc:         "load word and increment"
ST20_mac:           "multiply accumulate"
ST20_mul:           "multiply"
ST20_nfix:          "negative prefix"
ST20_nop:           "no operation"
ST20_not:           "bitwise not"
ST20_opr:           "operate"
ST20_or:            "or"
ST20_order:         "order"
ST20_orderu:        "unsigned order"
ST20_pfix:          "prefix"
ST20_rev:           "reverse"
ST20_rmw:           "read modify write"
ST20_rot:           "rotate stack"
ST20_run:           "run process"
ST20_saturate:      "saturate"
ST20_sbinc:         "store byte and increment"
ST20_shl:           "shift left"
ST20_shr:           "shift right"
ST20_signal:        "signal"
ST20_smacinit:      "initialize short multiply accumulate loop"
ST20_smacloop:      "short multiply accumulate loop"
ST20_smul:          "short multiply"
ST20_ssinc:         "store sixteen and increment"
ST20_statusclr:     "clear bits in status register"
ST20_statusset:     "set bits in status register"
ST20_statustst:     "test status register"
ST20_stl:           "store local"
ST20_stnl:          "store non-local"
ST20_stop:          "stop process"
ST20_sub:           "subtract"
ST20_subc:          "subtract with carry"
ST20_swap32:        "byte swap 32"
ST20_swinc:         "store word and increment"
ST20_timeslice:     "timeslice"
ST20_umac:          "unsigned multiply accumulate"
ST20_unsign:        "unsign argument"
ST20_wait:          "wait"
ST20_wsub:          "word subscript"
ST20_xbword:        "sign extend byte to word"
ST20_xor:           "exclusive or"
ST20_xsword:        "sign extend sixteen to word"

ST20_alt:           "alt start"
ST20_altend:        "alt end"
ST20_altwt:         "alt wait"
ST20_bcnt:          "byte count"
ST20_bitcnt:        "count bits set in word"
ST20_bitrevnbits:   "reverse bottom n bits in word"
ST20_bitrevword:    "reverse bits in word"
ST20_bsub:          "byte subscript"
ST20_call:          "call"
ST20_causeerror:    "cause error"
ST20_cb:            "check byte"
ST20_cbu:           "check byte unsigned"
ST20_ccnt1:         "check count from 1"
ST20_cflerr:        "check floating point error"
ST20_cir:           "check in range"
ST20_ciru:          "check in range unsigned"
ST20_clockdis:      "clock disable"
ST20_clockenb:      "clock enable"
ST20_clrhalterr:    "clear halt-on error flag"
ST20_crcbyte:       "calculate CRC on byte"
ST20_crcword:       "calculate CRC on word"
ST20_cs:            "check sixteen"
ST20_csngl:         "check single"
ST20_csu:           "check sixteen unsigned"
ST20_csub0:         "check subscript from 0"
ST20_cword:         "check word"
ST20_devlb:         "device load byte"
ST20_devls:         "device load sixteen"
ST20_devlw:         "device load word"
ST20_devmove:       "device move"
ST20_devsb:         "device store byte"
ST20_devss:         "device store sixteen"
ST20_devsw:         "device store word"
ST20_diff:          "difference"
ST20_disc:          "disable channel"
ST20_diss:          "disable skip"
ST20_dist:          "disable timer"
ST20_div:           "divide"
ST20_enbc:          "enable channel"
ST20_enbs:          "enable skip"
ST20_enbt:          "enable timer"
ST20_endp:          "end process"
ST20_fmul:          "fractional multiply"
ST20_fptesterr:     "test for FPU error"
ST20_gcall:         "general call"
ST20_gintdis:       "general interrupt disable"
ST20_gintenb:       "general interrupt enable"
ST20_in:            "input message"
ST20_insertqueue:   "insert at front of scheduler queue"
ST20_intdis:        "(localised) interrupt disable"
ST20_intenb:        "(localised) interrupt enable"
ST20_iret:          "interrupt return"
ST20_ladd:          "long add"
ST20_lb:            "load byte"
ST20_lbx:           "load byte and sign extend"
ST20_ldclock:       "load clock"
ST20_lddevid:       "load device identity"
ST20_ldiff:         "long diff"
ST20_ldinf:         "load infinity"
ST20_ldiv:          "long divide"
ST20_ldmemstartval: "load value of MemStart address"
ST20_ldpri:         "load current priority"
ST20_ldshadow:      "load shadow registers"
ST20_ldtimer:       "load timer"
ST20_ldtraph:       "load trap handler"
ST20_ldtrapped:     "load trapped process status"
ST20_lend:          "loop end"
ST20_lmul:          "long multiply"
ST20_ls:            "load sixteen"
ST20_lshl:          "long shift left"
ST20_lshr:          "long shift right"
ST20_lsub:          "long subtract"
ST20_lsum:          "long sum"
ST20_lsx:           "load sixteen and sign extend"
ST20_mint:          "minimum integer"
ST20_move:          "move message"
ST20_move2dall:     "2D block copy"
ST20_move2dinit:    "initialize data for 2D block move"
ST20_move2dnonzero: "2D block copy non-zero bytes"
ST20_move2dzero:    "2D block copy zero bytes"
ST20_norm:          "normalize"
ST20_out:           "output message"
ST20_outbyte:       "output byte"
ST20_outword:       "output word"
ST20_pop:           "pop processor stack"
ST20_postnormsn:    "post-normalize correction of single length fp number"
ST20_prod:          "product"
ST20_reboot:        "reboot"
ST20_rem:           "remainder"
ST20_resetch:       "reset channel"
ST20_restart:       "restart"
ST20_ret:           "return"
ST20_roundsn:       "round single length floating point number"
ST20_runp:          "run process"
ST20_satadd:        "saturating add"
ST20_satmul:        "saturating multiply"
ST20_satsub:        "saturating subtract"
ST20_saveh:         "save high priority queue registers"
ST20_savel:         "save low priority queue registers"
ST20_sb:            "store byte"
ST20_seterr:        "set error flags"
ST20_sethalterr:    "set halt-on error flag"
ST20_settimeslice:  "set timeslicing status"
ST20_slmul:         "signed long multiply"
ST20_ss:            "store sixteen"
ST20_ssub:          "sixteen subscript"
ST20_startp:        "start process"
ST20_stclock:       "store clock register"
ST20_sthb:          "store high priority back pointer"
ST20_sthf:          "store high priority front pointer"
ST20_stlb:          "store low priority back pointer"
ST20_stlf:          "store low priority front pointer"
ST20_stoperr:       "stop on error"
ST20_stopp:         "stop process"
ST20_stshadow:      "store shadow registers"
ST20_sttimer:       "store timer"
ST20_sttraph:       "store trap handler"
ST20_sttrapped:     "store trapped process"
ST20_sulmul:        "signed timer unsigned long multiply"
ST20_sum:           "sum"
ST20_swapqueue:     "swap scheduler queue"
ST20_swaptimer:     "swap timer queue"
ST20_talt:          "timer alt start"
ST20_taltwt:        "timer alt wait"
ST20_testerr:       "test error flag"
ST20_testhalterr:   "test halt-on error flag"
ST20_testpranal:    "test processor analysing"
ST20_tin:           "timer input"
ST20_trapdis:       "trap disable"
ST20_trapenb:       "trap enable"
ST20_tret:          "trap return"
ST20_unpacksn:      "unpack single length fp number"
ST20_wcnt:          "word count"
ST20_wsubdb:        "form double word subscript"
ST20_xdble:         "extend to double"
ST20_xword:         "extend word"