Compile for many targets

[Matthias Kretz]

Hi Caio,

sorry for taking "too long" to answer. My time is too limited currently...

Your main place to watch is this: https://github.com/VcDevel/Vc/issues/118

In any case, yes you have to translate from a runtime info to a compile-time 
difference. switch-case is the best solution in this case.

The issue with ExtraInstructions is hairy. I have no "100% that's the way to 
do it" recommendation. And I think this is even somewhat broken in the trig 
example in Vc. I'd be happy if you figure this out, if you paste your findings 
in the GitHub issue tracker.

Cheers,
  Matthias


On Samstag, 16. April 2016 19:21:00 CEST Caio S. Souza wrote:
> Hi!
> I'm a bit confused on how to make a program work on all available
> implementations. I implemented a simple function (foo) that uses Vc in
> a separate .cpp file. I then successfully compiled it using the macro
> vc_compile_for_all_implementations within cmake. Now I would like to
> select at runtime which version of foo to call based on the result of
> Vc::bestImplementationSupported. After looking at the trigonometric
> functions implementation I tried to use template specialization when
> defining foo and call each foo specialization inside an ugly
> switch-case. But I don't know how to specialize/call foo when there
> are extra instructions. How is the best way to proceed? Is a
> switch-case the best strategy in this context?
> 
> Thanks in advance
> --
> Caio S. Souza
> Laboratório de Biologia Teórica e Computacional
> Universidade de Brasília
> www.lbtc.unb.br
> 
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 Dr. Matthias Kretz                                https://kretzfamily.de
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