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Re: [PATCH 1/8] Add GCC_LIKELY and GCC_UNLIKELY


On 06/14/2018 02:32 PM, David Malcolm wrote:
> The idea is to later use these macros to mark the
>   if (dump_enabled_p ())
> parts of the compiler as cold, in the hope of helping non-PGO builds
> of gcc.
> 
> I haven't measured it yet, though.
> 
> gcc/ChangeLog:
> 	* system.h (GCC_LIKELY, GCC_UNLIKELY): New macros, adapted from
> 	libgfortran.h.
ISTM if we're going to bother with this stuff that we should try to be
consistent between glibc and gcc.  Anything else seems like utter
madness to me.

Jeff


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