Re: [ros-dev] [ros-diffs] [jgardou] 58660: [MESA32] * Disable SSE optimizations, as they only cause mayhem.

[Kamil Hornicek]

If I recall correctly there's a check whether the OS can handle 
masked/unmasked sse exceptions. It causes trouble even in Windows if the 
app using Mesa has it's own exception handlers installed IIRC. SSE works 
just fine. Just disable the (useless) _mesa_check_os_sse_suppor stuff 
(ReactOS supports this, no need to do the check) or find a way to stop 
the exception from propagating.

Regards,
Kamil

Dne 4.4.2013 12:34, Jérôme Gardou napsal(a):
>   It causes some kernel mode exception. The code
> deliberately throws an
>  SSE exception to see if the OS supports them. The trap handler considers
>  this as a k-mode exception and bug checks.
>
>  See http://jira.reactos.org/browse/CORE-6776
>
>  Timo Kreuzer a écrit :
> >  
> >  What exactly does it cause? And shouldn't we rather fix that, instead of
> >  disabling optimizations? mesa is already slow enough.
> >
> >  Am 03.04.2013 14:02, schrieb jgardou(a)svn.reactos.org:
> > >   Author: jgardou
> > >  Date: Wed Apr  3 12:02:58 2013
> > >  New Revision: 58660
> > >
> > >  URL: http://svn.reactos.org/svn/reactos?rev=58660&view=rev
> > >  Log:
> > >  [MESA32]
> > >    * Disable SSE optimizations, as they only cause mayhem.
> > >
> > >  Modified:
> > >       trunk/reactos/dll/opengl/mesa/src/mesa/CMakeLists.txt
> > >
> > >  Modified: trunk/reactos/dll/opengl/mesa/src/mesa/CMakeLists.txt
> > >  URL:
> > >
> > > http://svn.reactos.org/svn/reactos/trunk/reactos/dll/opengl/mesa/src/mesa/C…
> > >
> > >
> > >  ==============================================================================
> > >
> > >
> > >  --- trunk/reactos/dll/opengl/mesa/src/mesa/CMakeLists.txt [iso-8859-1]
> > >  (original)
> > >  +++ trunk/reactos/dll/opengl/mesa/src/mesa/CMakeLists.txt [iso-8859-1]
> > >  Wed Apr  3 12:02:58 2013
> > >  @@ -33,17 +33,18 @@
> > >            x86/3dnow_xform3.S
> > >            x86/3dnow_xform4.S
> > >            x86/3dnow_normal.S
> > >  -        x86/sse_xform1.S
> > >  -        x86/sse_xform2.S
> > >  -        x86/sse_xform3.S
> > >  -        x86/sse_xform4.S
> > >  -        x86/sse_normal.S
> > >  +        # x86/sse_xform1.S
> > >  +        # x86/sse_xform2.S
> > >  +        # x86/sse_xform3.S
> > >  +        # x86/sse_xform4.S
> > >  +        # x86/sse_normal.S
> > >            x86/read_rgba_span_x86.S)
> > >        add_definitions(
> > >            -DUSE_X86_ASM
> > >            -DUSE_MMX_ASM
> > >            -DUSE_3DNOW_ASM
> > >  -        -DUSE_SSE_ASM)
> > >  +        # -DUSE_SSE_ASM
> > >  +    )
> > >    endif()
> > >    list(APPEND SOURCE
> > >
> > >
> > >  
> >
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