[Bug middle-end/48609] Inefficient complex float argument passing/return

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48609

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
expand_assignment lacks CONCAT handling here:

  /* Don't move directly into a return register.  */
  if (TREE_CODE (to) == RESULT_DECL
      && (REG_P (to_rtx) || GET_CODE (to_rtx) == PARALLEL))
    {