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From: "qing.zhao at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102285] New flag -ftrivial-auto-var-init=zero causes
 crash in pr82421.c
Date: Fri, 01 Oct 2021 16:43:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102285

--- Comment #16 from Qing Zhao <qing.zhao at oracle dot com> ---
> On Oct 1, 2021, at 1:51 AM, rguenth at gcc dot gnu.org <gcc-bugzilla@gcc.=
gnu.org> wrote:
>=20
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102285
>=20
> --- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
> Because the variable doesn't need to be addressable.

One question:

For the following statement in the routine =E2=80=9Cfold_builtin_alloca_wit=
h_align=E2=80=9D in
tree-ssa-ccp.c:


  /* Fold alloca to the address of the array.  */
  return fold_convert (TREE_TYPE (lhs), build_fold_addr_expr (var));

Clearly, we build a add_expr for =E2=80=9Cvar=E2=80=9D, but why not =E2=80=
=9Cmark_addressable=E2=80=9D for
=E2=80=9Cvar=E2=80=9D since its address is taken?=