https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12850
--- Comment #50 from Andrew Pinski <pinskia at gcc dot gnu.org> --- For me (onm x86_64), RA seems high in memory and time at -O0 (this is with checking=yes but with -fno-checking) integrated RA : 1.96 ( 13%) 206M ( 23%)