Re: [PATCH 1/3] Fix Unlikely(x) == y
From: Arjan van de Ven <hidden>
Date: 2008-02-19 02:41:45
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On Tue, 19 Feb 2008 13:33:53 +1100 Nick Piggin [off-list ref] wrote:
Actually one thing I don't like about gcc is that I think it still emits cmovs for likely/unlikely branches, which is silly (the gcc developers seem to be in love with that instruction). If that goes away, then branch hints may be even better.
only for -Os and only if the result is smaller afaik. (cmov tends to be a performance loss most of the time so for -O2 and such it isn't used as far as I know.. it does make for nice small code however ;-) -- If you want to reach me at my work email, use arjan@linux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org