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
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