http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49079
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-20 13:05:23 UTC --- We call ustr_cmp_fast_buf with s1, $3 = 0x6101b0 "\245\001\002s2", 1 when compiled with -O1 instead of with s1, $1 = 0x40ac06 "s2", 2 when compiled with -O0.