https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85212
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2018-04-05 CC| |rguenth at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- While GCC 5.5 parallelizes the loop newer GCCs don't. Newer GCCs only parallelize without -floop-parallelize-all. But in no case we unroll the loop, so not sure what you expect? You also don't specify -funroll-loops, specifying that we do unroll. So can you please clarify what the bug is?