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

[Jochen Hub]

Hi Szilárd,

yes indeed, it's the gcc-llvm. Can I check if these llvm optimizations 
are present?

Thanks,
Jochen

Am 7/12/12 12:53 PM, schrieb 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
> <mailto: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 <tel:%2B49-551-39-14189>
>     http://cmb.bio.uni-goettingen.__de/ <http://cmb.bio.uni-goettingen.de/>
>     ------------------------------__---------------------
>
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-- 
---------------------------------------------------
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/
---------------------------------------------------