https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15513 Bug 15513 depends on bug 10624, which changed state.
Bug 10624 Summary: unroll-loops can't unroll nested constant loops https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10624 What |Removed |Added ---------------------------------------------------------------------------- Status|SUSPENDED |RESOLVED Resolution|--- |FIXED