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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104497] [11/12 Regression] Invalid gimple
 produced for (A?vect:vect)[i]
Date: Fri, 11 Feb 2022 10:00:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104497

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the issue here is that gimplification creates

      <D.1987>:
      iftmp.0 =3D inv;
      goto <D.1989>;
      <D.1988>:
      iftmp.0 =3D src;
      <D.1989>:
      _2 =3D VIEW_CONVERT_EXPR<int[4]>(iftmp.0)[i];

that requires a non-register iftmp.0, but we neither set DECL_NOT_GIMPLE_RE=
G_P
nor TREE_ADDRESSABLE on iftmp.0.  If we did the iftmp.0 =3D {inv,src}; stmts
also would need different gimplification.

Later update_address_taken comes along and "fixes" the missing
DECL_NOT_GIMPLE_REG_P but that then makes the assigns invalid IL.

We do not support ARRAY_REF (or COMPONENT_REF) on registers.=