cvs commit: src/sys/sys systm.h
cperciva at FreeBSD.org
Wed Feb 14 05:21:23 UTC 2007
cperciva 2007-02-14 05:21:22 UTC
FreeBSD src repository
Optimize bitcount32 by replacing 6 logical operations with 2. The key
observation here is that it doesn't matter what garbage accumulates in
bits which we're going to end up masking away anyway, as long as the
garbage doesn't overflow into bits which we care about.
This improved version may not be the fastest possible on all systems,
but it's certainly going to be better than what was here before.
Revision Changes Path
1.249 +3 -3 src/sys/sys/systm.h
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