[fpc-pascal] FPC Graphics options?

[Sven Barth]

Am 19.05.2017 12:51 schrieb "Mattias Gaertner" <nc-gaertnma at netcologne.de>:
>
> On Fri, 19 May 2017 10:54:25 +0200
> Sven Barth via fpc-pascal <fpc-pascal at lists.freepascal.org> wrote:
>
> >[...]
> > Even though FPC might use SSE for maths it will still use the x87 to
> > transfer floating values to/from function, especially if they take
Extended
> > as parameter/result.
>
> Can you elaborate on this?
> I thought on x64 does not have extended, so extended is double.

Only on Win64 cause Microsoft declared the x87 as deprecated there. All
other x86_64 OSes can happily make use of it and thus Extended is 80bit
there, thus resulting in the usage of the x87 instead of solely SSE.
(Note: you can also enable the x87 for Win64 per define when building the
compiler, but your mileage may vary...)

>
> > I did a test by disabling Extended on Linux x64 trunk compiler and RTL
and
> > it tripled the framerate from ~3 to ~10.
>
> And it works?

Yes, why shouldn't it? :)

Regards,
Sven
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