[zeromq-dev] __builtin_expect for clang

[Uli Köhler]

Hi!

I'm currently testing Clang(++) for some project and I noticed that
likely.hpp (which defines branch prediction macros) currently only supports
the GNU C compiler, while for other compilers an empty macro is used (e.g.
#define likely(x) (x))

Clang however supports the same syntax for __builtin_expect as GCC, see
http://llvm.org/docs/BranchWeightMetadata.html

How do you think about adding clang support to likely.hpp? If you think it
makes sense, I could submit a pull request on Github.

Best regards,
Uli
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