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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111754] [14 Regression] ICE: in decompose, at
 rtl.h:2313 at -O
Date: Tue, 10 Oct 2023 11:52:23 +0000
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X-Bugzilla-Keywords: ice-on-valid-code, needs-bisection
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111754

--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 10 Oct 2023, prathamesh3492 at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111754
>=20
> --- Comment #3 from prathamesh3492 at gcc dot gnu.org ---
> The issue is that we only support integral vector types in fold_vec_perm_=
cst,
> but fail to check for the same before calling it from fold_vec_perm.
> The following tweak fixes the ICE:
>=20
> diff --git a/gcc/fold-const.cc b/gcc/fold-const.cc
> index 4f8561509ff..a29a8af6d2f 100644
> --- a/gcc/fold-const.cc
> +++ b/gcc/fold-const.cc
> @@ -10801,7 +10801,8 @@ fold_vec_perm (tree type, tree arg0, tree arg1, c=
onst
> vec_perm_indices &sel)
>      return NULL_TREE;
>=20
>    if (TREE_CODE (arg0) =3D=3D VECTOR_CST
> -      && TREE_CODE (arg1) =3D=3D VECTOR_CST)
> +      && TREE_CODE (arg1) =3D=3D VECTOR_CST
> +      && INTEGRAL_TYPE_P (TREE_TYPE (type)))
>      return fold_vec_perm_cst (type, arg0, arg1, sel);

Huh, that looks wrong.  I fail to see how the element type matters
at all.=