https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53957
--- Comment #20 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- I looked at the output of gfortran -Ofast -funroll-loops -march=native -mtune=native -fopt-info-vec mp_prop_design.f90 2>&1 | wc -l in the Polyhedron testsuite, and I can confirm it really shows much more vectorization than before. So, I'm glad that part seems to be fixed. Regarding auto-parallelization: I can confirm your observation under Linux, it doesn't do any more than on Windows. I think I will open up meta-PR and make this PR depend on it.