https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113832
--- Comment #5 from Roger Sayle <roger at nextmovesoftware dot com> --- I'm trying to confirm that there are actually widening multiplications in 464.h264ref (on aarch64), but if anyone's already done an analysis of what might be causing these performance swings, please do post (a pointer here).