[Bug tree-optimization/69047] memcpy is not as optimized as union is

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69047

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 39498
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39498&action=edit
patch

Patch queued for testing