https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83064
--- Comment #18 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- (In reply to Dominique d'Humieres from comment #17) > > The original test case works fine with gcc-6 with multiple invocations, > > so this is at least a gcc-8 regression. > > AFAICT the code is parallelized with gcc-8 only. What do we do for the gcc-8 release? Disable -ftree-parallelize-loops ?