https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80283
--- Comment #25 from Michael_S <already5chosen at yahoo dot com> --- Just a reminder 16 months later: x86-64 case - both 8.2 and trunk are as bad as they were. ARM-Neon case - 8.2 appears to be worse (by 5%) than either 6.x or 7.x. I didn't check trunk.
