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

[Alex Ionescu]

Considering that parts of NT4 already supported IA64, I think it's safe 
to assume that Win95 supported most probably even SSE.

As for what happens when a program with SSE instructions is executed on 
a non-SSE CPU, I believe the opcodes will be invalid and generate GPFs.

Best regards,
Alex Ionescu

ShadowFlare wrote:

>  --- 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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