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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