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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/104757] [12 Regression] ICE (segfault) GIMPLE pass:
 walloca - in gimple_range_global
Date: Wed, 02 Mar 2022 11:52:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104757

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Tobias Burnus from comment #3)
> (In reply to Thomas Schwinge from comment #1)
> > Confirmed ever since commit 48c6cac9caea1dc7c5f50ad3a736f6693e74a11b
> which was committed on 'Nov 12 17:58:21 2021'. =E2=80=94 However, that's =
a FE-only
> patch which only affects parsing.
>=20
>  * * *
>=20
> The ICE/segfault is in  ranger_cache::get_global_range (irange &r, tree
> name) const   for
> 923       r =3D gimple_range_global (name);
>=20
> (gdb) p debug_tree(name)
>  <ssa_name 0x7ffff6fd1798
>     type <boolean_type 0x7ffff6fed150 logical(kind=3D4) public unsigned SI
>     ...
>=20
> which is a 4-byte Boolean value.

you don't quote more but I guess this name is released and thus has a NULL
SSA_NAME_DEF_STMT so the is_a check crashes.

  if (SSA_NAME_IS_DEFAULT_DEF (name) || (cfun && cfun->after_inlining)
      || is_a<gphi *> (SSA_NAME_DEF_STMT (name)))=