https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32667
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
One way to "fix" this is to emit the memcpy as
if (p != q)
memcpy (p, q, ...);
but of course that comes at a cost in code-size and runtime for no obvious good
reason (in practice).
