Erik Mouw wrote:
On Wed, Aug 10, 2005 at 05:54:44PM +0200, Oliver Korpilla wrote:
Wouldn't it be more sensible to supply one portable one, with bit
shifts, and people with a need for O(1) timing could implement it using
an array?
Send a patch to the linux-kernel mailing list and see what happens.
Sticking a few defines in a header somewhere should do, I believe:
#define floor_log2(x) (fls(x) - 1)
#define ceil_log2(x) (fls((x) - 1)
fls() is both defined in the kernel and a gcc builtin.
Rene.
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