------- Comment #6 from poirierg at gmail dot com 2006-10-12 15:03 ------- (In reply to comment #4) > (In reply to comment #3) > > Does it work when compiled with -O0 instead of -O4? How about -O1? > > > > Besies above, I noticed that the asm in get_cabac looks to be clobbering > > memory > > but is not marked as such. > > > > Andrew, this testcase violates aliasing rules. > > h264.c: In function 'filter_mb_fast': > h264.c:7074: warning: dereferencing type-punned pointer will break > strict-aliasing rules
For what it's worth, the code around line 7074 compiled correctly with snapshot 4.2-20060909 and has been in FFmpeg since Mon Aug 28 09:33:01 2006 UTC, so IMHO it shouldn't be the cause of the problem I'm reporting today. However, if you have a suggestion to improve this code, I'm all ears Guillaume -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29440