Author: Dan Andersson
Date: 09:41:30 05/21/02
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Links to code: http://www.df.lth.se/~john_e/fr_gems.html http://www.df.lth.se/~john_e/gems/gem0018.html The code by Vesa Karvonen: bswap eax ; Data in EAX mov edx,eax ; Trashes EDX and eax,00F0F0F0Fh ; "AND eax,0F0F0F0Fh" < "AND edx,0F0F0F0Fh" xor edx,eax ; Smaller than "AND edx,0F0F0F0F0h"! rol eax,8 ; Rotate instead of 2 shifts! or eax,edx mov edx,eax and eax,033333333h xor edx,eax rol eax,4 or eax,edx ; Shift version could use LEAs, mov edx,eax ; but it may not be faster. and eax,055555555h xor edx,eax rol eax,2 or eax,edx ror eax,7 ; Rotate back... Or find the e-book Art of Assembly and implement it yourself. MvH Dan Andersson
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