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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/103622] [12 Regression] ICE: Segmentation fault (in
 altivec_resolve_new_overloaded_builtin)
Date: Mon, 13 Dec 2021 14:01:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103622

--- Comment #8 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Hm, no, it's probably just that it's iterating looking for long double and =
runs
across this instance with an uninitialized function type.  So this patch so=
lves
the problem:

diff --git a/gcc/config/rs6000/rs6000-c.c b/gcc/config/rs6000/rs6000-c.c
index 8e83d97e72f..fc4cc929884 100644
--- a/gcc/config/rs6000/rs6000-c.c
+++ b/gcc/config/rs6000/rs6000-c.c
@@ -2943,6 +2943,12 @@ altivec_resolve_new_overloaded_builtin (location_t l=
oc,
tree fndecl,

        for (; instance !=3D NULL; instance =3D instance->next)
          {
+           /* It is possible for an instance to require a data type that i=
sn't
+              defined on this target, in which case instance->fntype will =
be
+              NULL.  */
+           if (!instance->fntype)
+             continue;
+
            bool mismatch =3D false;
            tree nextparm =3D TYPE_ARG_TYPES (instance->fntype);=