On Thu, 28 Jul 2005, Linus Torvalds wrote: > > Since you're considering GCC-generated code for ffs(), ffz() and friends, > > how about trying __builtin_ffs(), __builtin_clz() and __builtin_ctz() as > > apropriate? > > Please don't. Try again in three years when everybody has them. Well, __builtin_ffs() has been there since at least gcc 2.95. The two others are quite recent, indeed -- apparently only since GCC 3.4. They may still be considered to be used conditionally if there is justified benefit. Maciej - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Steven Rostedt <[email protected]>
- Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Daniel Walker <[email protected]>
- Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Steven Rostedt <[email protected]>
- Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Steven Rostedt <[email protected]>
- Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Steven Rostedt <[email protected]>
- Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Steven Rostedt <[email protected]>
- Re: [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
- From: Nick Piggin <[email protected]>
- [PATCH] speed up on find_first_bit for i386 (let compiler do the work)
- From: Steven Rostedt <[email protected]>
- Re: [PATCH] speed up on find_first_bit for i386 (let compiler do the work)
- From: Linus Torvalds <[email protected]>
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- Re: [PATCH] speed up on find_first_bit for i386 (let compiler do the work)
- From: "Maciej W. Rozycki" <[email protected]>
- Re: [PATCH] speed up on find_first_bit for i386 (let compiler do the work)
- From: Linus Torvalds <[email protected]>
- [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable
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