Never mind my challenge, I should have known Dmitry had it covered:

;       Input X  = abcdefgh , Output X = hgfedcba
;       Written by Dmitry A. Kiryashov 2000
;       12 clocks/words

reverse8bit:

        swapf   X,W     ;efghabcd
        xorwf   X,W     ;efghabcd
                        ;abcdefgh

        andlw   0x66    ;.fg..bc.
                        ;.bc..fg.

        xorwf   X,F     ;afgdebch
;
        rrf     X,W
        rrf     X,F     ;hafgdebc
;
        andlw   0x55    ;.a.g.e.c
        addwf   X,F     ;h.f.d.b.
                        ;a.g.e.c.
        rrf     X,F     ;.h.f.d.b
                        ;.a.g.e.c

        addwf   X,F     ;ahgfedcb
;
        rlf     X,W
        rlf     X,F     ;hgfedcba
                        ;it can be replaced
                        ;with rlf X,W
                        ;if necessary...


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