https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90978
--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I doubt -O3 would help much, a significant amount of tests is already with -O3. As Martin's pages show, the less covered areas is e.g. old reload (you need some target that doesn't use LRA), driver (say for -march=native, that is hard to test unless you run it on a lot of different hw), some features that require other tools (e.g. autofdo), some features that require specially configured compiler and hw (e.g. offloading).
