https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82229 --- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> --- One another observation: using PGO (-fprofile-generate and -fprofile-use), both GCC 6 and GCC 7 have similar performance: 34fps. While GCC 6 has 43 fps on my machine.