[MPlayer-dev-eng] Mencoder crash with x264 - mingw32 on p4 build, maybe other

[Gianluigi Tiesi]

On Thu, Mar 29, 2007 at 09:28:46AM +0800, Zuxy Meng wrote:
> Hi,
> 
> 2007/3/29, Gianluigi Tiesi <mplayer at netfarm.it>:
> >I've been experimenting crashes when trying to encode using x264 or lavc
> >h264, this happens on a p4 and not on a amd tb k7, this is strange
> >because the code seams to be mmx.
> 
> No it's SSE2 code. A 0x66 before an MMX instruction make it an SSE2
> one. Please update your unassembler:-)

Yes there is a 0x66 before, but I don't known mmx or sse, so I was
wrong. I thinked about a memalign issue, but I've excluded them
since I've built the code without forcing sse support
(on win32 it's disabled by default), so this code is anyway
compiled in and conditionally executed (not using ifdef)

> >00AB0968    66:0FF535 2C0CC>PMADDWD MM6,QWORD PTR DS:[CE0C2C]
> >                        ^^^^^^^^^^^^
> >crash here
> >
> >00AB0970    0F12FE          MOVHLPS XMM7,XMM6
> >00AB0973    66:0FFEF7       PADDD MM6,MM7
> >00AB0977    F2:             PREFIX REPNE:                            ; 
> >Superfluous prefix
> >00AB0978    0F70FE 0E       PSHUFW MM7,MM6,0E
> 
> Actually this should be PSHUFLW XMM7, XMM6, 0E.
yes but how can I solve it? how can I verify if it's a memalign code ?
someone can confirm that it works on linux?

Bye

-- 
Gianluigi Tiesi <sherpya at netfarm.it>
EDP Project Leader
Netfarm S.r.l. - http://www.netfarm.it/
Free Software: http://oss.netfarm.it/