RE: [ros-dev] Save FPU on task switch/SSE support

[ShadowFlare]

--- Hartmut Birr <hartmut.birr(a)gmx.de> wrote:

>   
>  
> >   -----Original Message-----
> >  From: ros-dev-bounces(a)reactos.com 
> >  [mailto:[e-mail]] On Behalf Of 
>  Gregor Anich
> >   Sent: Friday, October 08, 2004 7:50 PM
> >  To: ReactOS Development List
> >  Subject: Re: [ros-dev] Save FPU on task switch/SSE 
>  support
> >   
> >  
> >  Hi again ;)
> >  
> >  Do you have any idea where the SSE registers 
>  should be stored?
> >   The thing with the flag for the FPU state is
> > nice, 
>  since it allows to 
> >   skip saving of the FPU state when not needed - do
>  you know if 
> >   we can do 
> >  the same for SSE?
> >  
> >  Thanks,
> >    blight
> >   
>  
>  We can do the same for sse. If sse is available we
>  must use fxsave/fxrstor
>  instead of fsave/frstor and the buffer is 512 byte
>  (108 byte for normal
>  fpu).
>  
>  - Hartmut 
When were the processors that supported this first
available?  If they weren't available for Microsoft to
include support for them in Win95 or 98, what happens
when those instructions are used in programs under
those windows versions?

-ShadowFlare


		
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