Date: Sun, 18 Jul 1999 15:46:45 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Martin Str|mberg <ams AT ludd DOT luth DOT se>, bas DOT hamstra AT wxs DOT nl
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Subject: Re: LastBit()
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On 18 Jul 1999, Martin Str|mberg wrote:

> b)  Not sure (am not an assembly guy). But how about checking the
>     correct first half first and not finding anything, check the
>     second half (all in assebler)?

I think library function `ffs' should do the trick.  It's already written 
in assembly, so it should be fast enough, and it is only a few instructions
long.