http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14741
--- Comment #20 from Sebastian Pop <spop at gcc dot gnu.org> --- -floop-nest-optimize does not have a cost model and so it blocks all loop nests. These two stmts are blocked: A=0.1D0 B=0.1D0 This other stmt is not blocked: C(I,J)=C(I,J)+A(I,K)*B(K,J) The only thing we can get from the dump file for this stmt is: number of SCoPs: 0 most likely scop detection did not like something in that loop nest.