https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86735
--- Comment #1 from janus at gcc dot gnu.org --- (In reply to janus from comment #0) > With 8.2.0 and trunk, however, the second line has varying random numbers > when the code is compiled with "-march=skylake-avx512 -Ofast". > > -march=skylake works, -O3 works as well. Instead of "-Ofast", it is sufficient to use "-O3 -fstack-arrays" to reproduce the problem.
