please dont rip this site 
From Dmitry Kiryashov [zews at AHA.RU]

a) abcd.efgh -> bcda.fghe

        rlf     X,W
        rlf     X,F     ;bcdefgha

        swapf   X,W     ;...a...e
        xorwf   X,W
        andlw   0x11    ;...<a^e>...<e^a>
        xorwf   X,F     ;bcdafghe

b) abcd.efgh -> dabc.hefg

        rrf     X,W
        rrf     X,F     ;habcdefg

        swapf   X,W     ;d...h...
        xorwf   X,W
        andlw   0x88    ;<d^h>...<h^d>...
        xorwf   X,F     ;dabchefg
file: /Techref/scenix/lib/math/bit/rotnib.htm, 0KB, , updated: 2000/4/20 13:02, local time: 2024/11/26 04:52,
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