I don't think so. I wrote a code that can be 10% slower without UNLIKELY several weeks ago: http://trac.webkit.org/browser/trunk/Source/WebCore/html/HTMLCollection.cpp#L289
On Mon, Oct 1, 2012 at 10:55 PM, Adam Barth <[email protected]> wrote: > According to < > http://stackoverflow.com/questions/1851299/is-it-possible-to-tell-the-branch-predictor-how-likely-it-is-to-follow-the-branc > >, > __builtin_expect (what our LIKELY and UNLIKELY macros expand to [1]) > doesn't do anything on modern CPUs. Apparently, these used to be > important for PowerPC, but I don't think many folks use WebKit on > PowerPC anymore. > > Should we remove these macros? I wasted some time today experimenting > with them without realizing that they compile to no-ops in clang. > > Adam > > [1] http://trac.webkit.org/browser/trunk/Source/WTF/wtf/Compiler.h#L188 > _______________________________________________ > webkit-dev mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo/webkit-dev >
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