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Subject: [Bug middle-end/102285] New flag -ftrivial-auto-var-init=zero causes
 crash in pr82421.c
Date: Thu, 30 Sep 2021 20:53:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102285

--- Comment #11 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to qinzhao from comment #10)

> 2734         /* The heuristic of fold_builtin_alloca_with_align differs

git blame says:


13e49da934e9 (Tom de Vries           2011-10-07 12:49:49 +0000 2732)       =
  /*
The heuristic of fold_builtin_alloca_with_align differs before and
13e49da934e9 (Tom de Vries           2011-10-07 12:49:49 +0000 2733)=20=20=
=20=20=20=20
after inlining, so we don't require the arg to be changed into a
13e49da934e9 (Tom de Vries           2011-10-07 12:49:49 +0000 2734)=20=20=
=20=20=20=20
constant for folding, but just to be constant.  */
9e878cf1bae7 (Eric Botcazou          2017-10-19 15:58:05 +0000 2735)       =
  if
(gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN)
9e878cf1bae7 (Eric Botcazou          2017-10-19 15:58:05 +0000 2736)       =
 ||
gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX))
1fed1006552c (Tom de Vries           2011-08-31 07:04:25 +0000 2737)=20=20=
=20=20=20=20=20=20=20=20
{
13e49da934e9 (Tom de Vries           2011-10-07 12:49:49 +0000 2738)=20=20=
=20=20=20=20=20=20=20=20=20
 tree new_rhs =3D fold_builtin_alloca_with_align (stmt);
5d882cc1dafe (Richard Guenther       2011-09-02 11:53:55 +0000 2739)=20=20=
=20=20=20=20=20=20=20=20=20
 if (new_rhs)
5d882cc1dafe (Richard Guenther       2011-09-02 11:53:55 +0000 2740)       =
   {
52a5515ed661 (Richard Biener         2021-04-14 13:40:58 +0200 2741)=20=20=
=20=20=20=20=20
gimplify_and_update_call_from_tree (gsi, new_rhs);
2f31f742a693 (Tom de Vries           2011-12-17 11:39:43 +0000 2742)=20=20=
=20=20=20=20=20
tree var =3D TREE_OPERAND (TREE_OPERAND (new_rhs, 0),0);
2f31f742a693 (Tom de Vries           2011-12-17 11:39:43 +0000 2743)=20=20=
=20=20=20=20=20
insert_clobbers_for_var (*gsi, var);
5d882cc1dafe (Richard Guenther       2011-09-02 11:53:55 +0000 2744)=20=20=
=20=20=20=20=20
return true;
5d882cc1dafe (Richard Guenther       2011-09-02 11:53:55 +0000 2745)       =
   }
1fed1006552c (Tom de Vries           2011-08-31 07:04:25 +0000 2746)=20=20=
=20=20=20=20=20=20=20=20
}

so at least Tom, Eric and Richard have been in there.=