theora dev - Jun 2006 - Theora MMX and Mac OS X Intel

hi,

i was trying to enable the mmx code on mac os x.
to get to that point one has to replace some inline assembler code:
.balign 16  ->  .p2align 4
and replace .rept .. .endr with #defines.

but to makes things more complicated apple's GAS does not support
movsx instructions and thus the following line does not work:
"  movsx       %%di, %%edi      \n\t"
[ more details at https://trac.xiph.org/browser/trunk/theora/lib/ 
x86_32/dsp_mmx.c#L443 ]

if anyone has an idea how that could be replaced or written in a way  
that it works
on OS X, please let me know. making asm optimization available for os  
x intel would be nice.

j

-------------- next part --------------
A non-text attachment was scrubbed...
Name: theora_mactel.patch
Type: application/octet-stream
Size: 25170 bytes
Desc: not available
Url :
http://lists.xiph.org/pipermail/theora-dev/attachments/20060621/8c7543fe/theora_mactel.obj

Maybe , instead a MOV, you could do an ADD with a Zero immediate
something like that:

ADD di, edi, 0

I dont know MMX assembly code, so I dont know if it is possible.
just an idea...



On 6/21/06, j@v2v.cc <j@v2v.cc> wrote:
> hi,
>
> i was trying to enable the mmx code on mac os x.
> to get to that point one has to replace some inline assembler code:
> .balign 16  ->  .p2align 4
> and replace .rept .. .endr with #defines.
>
> but to makes things more complicated apple's GAS does not support
> movsx instructions and thus the following line does not work:
> "  movsx       %%di, %%edi      \n\t"
> [ more details at https://trac.xiph.org/browser/trunk/theora/lib/
> x86_32/dsp_mmx.c#L443 ]
>
> if anyone has an idea how that could be replaced or written in a way
> that it works
> on OS X, please let me know. making asm optimization available for os
> x intel would be nice.
>
> j
>
>
>
> _______________________________________________
> theora-dev mailing list
> theora-dev@xiph.org
> http://lists.xiph.org/mailman/listinfo/theora-dev
>
>
>
>

-- 
________________________________________
Felipe Portavales <portavales@gmail.com>
Undergraduate Student - IC-UNICAMP
Computer Systems Laboratory
http://www.lsc.ic.unicamp.br

>>>>> "j" == j  <j@v2v.cc> writes:
> but to makes things more complicated apple's GAS does not support
> movsx instructions and thus the following line does not work
> [..]
AFAIK in AT&T asm syntax, that command should read "moswl".  (two
size
suffixes, have a look at node i386-Mnemonics in the info file)

regards,

David
-- 
GnuPG public key: http://user.cs.tu-berlin.de/~dvdkhlng/dk.gpg
Fingerprint: B17A DC95 D293 657B 4205  D016 7DEF 5323 C174 7D40