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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Date: Sun, 12 Dec 2021 06:25:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99955

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
handle_vector_size_attribute does:

  /* Build back pointers if needed.  */
  tree new_type =3D build_vector_type (type, nunits);

  /* Build back pointers if needed.  */
  *node =3D lang_hooks.types.reconstruct_complex_type (*node, new_type);


But the default reconstruct_complex_type never reapplies the attributes bac=
k on
it. (I Have not looked into the c++ front-end's implementation to about the
same).=