Fwd: Re: Branchless implementation for literal case – is it worth it?

Joachim Breitner mail at joachim-breitner.de
Mon Apr 20 18:05:18 UTC 2015


Am Montag, den 20.04.2015, 19:45 +0200 schrieb Niculae Ionita:
> Sorry, I forgot to answer to the list.

ah, and sorry for telling you so before looking on the list.

> If the code is already there and some architectures can profit of it, 
> especially in inner loops - why not just make it an optimisation flag?

Without even one good example where it is an improvement, this does not
make sense. And even with an example: It degrades performance in other
cases, so a module-wide flag would probably not cut it.

Joachim Breitner
  mail at joachim-breitner.de

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