A testcase for x86 architecture (Intel Core i5 CPU here): 1) Download http://sourceforge.net/projects/faac/files/faad2-src/faad2-2.6/faad2-2.6.1.tar.gz/download
2) Build it using these commands perl -pi -e 's|dnl AC_PROG_CXX|AC_PROG_CXX|' configure.in autoreconf -vif configure --disable-static using GCC 4.2.4 and GCC 4.4.x 3) faad binary compiled with GCC 4.4.x will fail to properly decode some AAC files (a sample file can be downloaded here http://bugzilla.mplayerhq.hu/attachment.cgi?id=651 ) faad -o outfile.wav out.aac ... Decoding out.aac took: 0.21 sec. 285.83x real-time. (GCC 4.2.x) Decoding out.aac took: 1.55 sec. 38.72x real-time. (GCC 4.4.x) So, we have two bugs here: 1) faad2's AAC decode algorithm fails to work correctly under GCC 4.4.x (even with gcc -O2 -march=i686). 3) faad2's AAC decode algorithm compiled with GCC 4.4.x works an order of magnitude slower than the same code code compiled using GCC 4.2.x. -- Summary: [GCC 4.4.x regression] Invalid assembly code is generated for x86 architecture for faad2 library (AAC decode algorithm) Product: gcc Version: 4.4.5 Status: UNCONFIRMED Severity: critical Priority: P3 Component: inline-asm AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: t dot artem at mailcity dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45160
