lkml.org 
[lkml]   [2003]   [Apr]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC][PATCH] Faster generic_fls
From
Date
On Mer, 2003-04-30 at 17:16, Linus Torvalds wrote:
> Clearly you're not going to make _one_ load to get fls, since having a
> 4GB lookup array for a 32-bit fls would be "somewhat" wasteful.

It ought to be basically the same as ffs because if I remember rightly

ffs(x^(x-1)) == fls(x)

Been a long time so I may have it wrong

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:35    [from the cache]
©2003-2011 Jasper Spaans