Rotate the nibbles within a byte.
From Dmitry Kiryashov [zews at AHA.RU]
a) abcd.efgh -> bcda.fghe
mov W, <<X
rl X ;bcdefgha
mov W, <>X ;...a...e
xor W, X
and W, #$11 ;...<a^e>...<e^a>
xor X, W ;bcdafghe
b) abcd.efgh -> dabc.hefg
mov W, >>X
rr X ;habcdefg
mov W, <>X ;d...h...
xor W, X
and W, #$88 ;<d^h>...<h^d>...
xor X, W ;dabchefg
| file: /Techref/scenix/lib/math/bit/rotnib_sx.htm, 0KB, , updated: 2004/6/10 13:40, local time: 2025/1/13 01:13,
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