[gmx-developers] #ifdef statement to test for Apple compiler

[Szilárd Páll]

Hi,

Which compiler are you referring to, gcc-llvm? Which version? Which
code-base are you compiling?

Normally, when it comes to such optimizations it's the compiler that
matters, not so much the OS itself (except on Win).

--
Szilárd


On Thu, Jul 12, 2012 at 9:24 AM, Jochen Hub <jhub at gwdg.de> wrote:

> Hi,
>
> is there a constant defined in the code that allows to test if gromacs is
> compiled with an Apple compiler?
>
> I ask since I need to compute many sine's and cosines, and the SSE2-using
> function gmx_mm_sincos_ps is slower on a Mac than a simple sinf/cosf behind
> each other. I assume that the Mac uses its optimized vsincosf function,
> that's why its faster than the SSE2-using function. So want to use
> sinf/cosf on the apple, but gmx_mm_sincos_ps anywhere else (as long as SSE2
> is present). Any idea how to check this?
>
> Many thanks,
> Jochen
>
>
>
>
>
> --
> ------------------------------**---------------------
> Dr. Jochen Hub
> Computational Molecular Biophysics Group
> Institute for Microbiology and Genetics
> Georg-August-University of Göttingen
> Justus-von-Liebig-Weg 11, 37077 Göttingen, Germany.
> Phone: +49-551-39-14189
> http://cmb.bio.uni-goettingen.**de/ <http://cmb.bio.uni-goettingen.de/>
> ------------------------------**---------------------
>
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