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[ cegcc-Bugs (use Trac instead)-2905279 ] CeGCC 0.59.1 broken ffmpeg_svn20620

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[ cegcc-Bugs (use Trac instead)-2905279 ] CeGCC 0.59.1 broken ffmpeg_svn20620

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Bugs (use Trac instead) item #2905279, was opened at 2009-11-28 02:55
Message generated for change (Comment added) made by pfalcon
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=865514&aid=2905279&group_id=173455

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Category: MinGW32CE (arm-wince-mingw32ce
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: CeGCC 0.59.1 broken ffmpeg_svn20620

Initial Comment:
CeGCC 0.59.1 broken ffmpeg.I can compile ffmpeg, but i get a Datatype misalignment when i use it. In 0.51.0, it work.

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>Comment By: Paul Sokolovsky (pfalcon)
Date: 2011-02-05 07:08

Message:
Thanks for your bug report!

To ease maintenance of the project, we are migrating bug tracking
facilities to Trac. We would appreciate if you re-posted this bug on Trac
via https://sourceforge.net/apps/trac/cegcc/newticket . Please include link
to this bug for reference.


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Comment By: Pierre Ynard (linkfanel)
Date: 2009-11-30 07:33

Message:
Provided here is the asm output for the hl_decode_mb_complex() function in
libavcodec/h264.c, which contains the offending code. Both are compiled
from ffmpeg revision 20630, the first one with the revision 1314 of cegcc
(gcc 4.1) and the second one with revision 1364 (gcc 4.4). The PC at the
Data Abort maps to address 0x2fe7c, which apparently corresponds to 0x1e158
in the version that doesn't crash. CFLAGS -funroll-loops -mtune=arm920t
-march=armv4t -O3 were used.

Since I can't seem to be able to add attachments:
http://www.linkfanel.net/disass-r1314.txt
http://www.linkfanel.net/disass-r1364.txt

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Comment By: Pierre Ynard (linkfanel)
Date: 2009-11-28 07:51

Message:
I was just looking into the same issue. Since cegcc switched to gcc 4.4 in
revision 1315, ffmpeg is somehow miscompiled, and crashes. For me, it
happens when playing some H264 video. I get a:

Data Abort: Thread=81da6c50 Proc=80298c70 'foo.exe'
AKY=00020001 PC=00bd9290(libavcodec_plugin.dll+0x00189290)
RA=00732c62(foo.exe+0x00722c62) BVA=24732c62 FSR=00000003

This maps to line 2643 in libavcodec/h264.c. I could provide asm extracts
and more information.

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Comment By: Danny Backx (dannybackx)
Date: 2009-11-28 06:36

Message:
Please provide more information : where does it crash, which instructions
are there, how were these instructions in the version compiled with 0.51 ?

Between 0.51 and 0.59 we changed gcc versions (from 4.1 to 4.4).


----------------------------------------------------------------------

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https://sourceforge.net/tracker/?func=detail&atid=865514&aid=2905279&group_id=173455

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