https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65478
--- Comment #19 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Actually at second thought, would BIT_FIELD_REF <arg1_3(D), ...> allow us to avoid the actual memory store? I tought like COMPONENT_REF it takes address as parameter. What I am hoping is to fully optimize out union doub x; at early optimization time.
