https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82471
--- Comment #5 from Chinoune <chinoune.mehdi at hotmail dot com> --- I have just tried FORALL and it has the same problem : FORALL(K=1:N, J=1:M, I=1:L) is much slower than FORALL(I=1:L, J=1:M, K=1:N).