https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61292
--- Comment #2 from Jim Rees <jimreesma at gmail dot com> --- Created attachment 47203 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47203&action=edit Reproducer source Compile with -std=c++14 (or higher standard), -O1 (not -O0, for easy of comprehending assembly) -march=haswell (or greater, anything that enables __AVX__ support).