http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36503
--- Comment #8 from Alexander Strange <astrange at ithinksw dot com> 2010-10-21 04:39:36 UTC --- I built ffmpeg for x86-64 with --disable-asm with the attached patch and the regression tests failed. Reverting the patch fixes them. I saved the binaries but haven't investigated yet.