$ printf "\x1d\x25\x40\x05\x01\x00\x84\xe8" | pysvp64dis -v
1d 25 40 05    sv.ldu/ff=~RC1 *r16,0(*r0)
01 00 84 e8
    spec
        sv.ldu RT,DS(RA) XO=1
    pcode
        EA <- (RA) + EXTS(DS || 0b00)
        RT <- MEM(EA, 8)
        RA <- EA
    binary
        [0:8]   00000101
        [8:16]  01000000
        [16:24] 00100101
        [24:32] 00011101
        [32:40] 11101000
        [40:48] 10000100
        [48:56] 00000000
        [56:64] 00000001
    opcodes
        111010------------------------01
    PO
        111010
        32, 33, 34, 35, 36, 37
    XO
        01
        62, 63
    RT (vector)
        0010000
        38, 39, 40, 41, 42, 19, 20
        extra3[0]
    DS = EXTS(DS || 00)
        DS
            0
            48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, {0}, {0}
    RA (vector)
        0000000000000
        43, 44, 45, 46, 47, 22, 23, 22, 23, 22, 23, 22, 23
        extra3[1]
    RM
        ld/st immediate&indexed: Rc=0: ffirst z/nonz
        RM
            000000000010010100011101
            6, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
        RM.mmode
            0
            6
        RM.mask
            000
            8, 10, 11
        RM.elwidth
            00
            12, 13
        RM.ewsrc
            00
            14, 15
        RM.subvl
            00
            16, 17
        RM.mode
            11101
            27, 28, 29, 30, 31
        RM.mode.sel
            11
            27, 28
        RM.smask
            000
            24, 25, 26
        RM.extra
            100101000
            18, 19, 20, 21, 22, 23, 24, 25, 26
        RM.extra2
            100101000
            18, 19, 20, 21, 22, 23, 24, 25, 26
        RM.extra2.idx0
            10
            18, 19
        RM.extra2.idx1
            01
            20, 21
        RM.extra2.idx2
            01
            22, 23
        RM.extra2.idx3
            00
            24, 25
        RM.extra3
            100101000
            18, 19, 20, 21, 22, 23, 24, 25, 26
        RM.extra3.idx0
            100
            18, 19, 20
        RM.extra3.idx1
            101
            21, 22, 23
        RM.extra3.idx2
            000
            24, 25, 26
        RM.VLi
            1
            27
        RM.inv
            1
            29
        RM.els
            0
            30
        RM.RC1
            1
            31