https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947 Bug 53947 depends on bug 25621, which changed state.
Bug 25621 Summary: Missed optimization when unrolling the loop (splitting up the sum) (only with -ffast-math) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25621 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED