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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103622] ICE: Segmentation fault (in
 altivec_resolve_new_overloaded_builtin)
Date: Thu, 09 Dec 2021 09:50:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103622

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bergner at gcc dot gnu.org,
                   |                            |linkw at gcc dot gnu.org,
                   |                            |segher at gcc dot gnu.org,
                   |                            |wschmidt at gcc dot gnu.org

--- Comment #1 from Kewen Lin <linkw at gcc dot gnu.org> ---
Confirmed, this requires one e300c3 cross build to reproduce:

2944=E2=94=82         for (; instance !=3D NULL; instance =3D instance->nex=
t)
2945=E2=94=82           {
2946=E2=94=82             bool mismatch =3D false;
2947=E2=94=9C=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80> tree nextparm =3D TYPE_ARG_TYPES (=
instance->fntype);
2948=E2=94=82
2949=E2=94=82             for (unsigned int arg_i =3D 0;

(gdb) p instance->fntype
$1 =3D <tree 0x0>

The overloaded bif fntype for RS6000_INST_VSEEQP relies on type usi_ftype_t=
f.

  rs6000_instance_info[RS6000_INST_VSEEQP].fntype
    =3D usi_ftype_tf;

  if (float128_type_node)
    usi_ftype_tf
    =3D build_function_type_list (  unsigned_intSI_type_node,
                                  float128_type_node,
                                NULL_TREE)

But on e300c3 there is no float128 type support (float128_type_node is NULL=
).

One thought seems to check instance->fntype first and take (skip) it as
mismatch if it's NULL.=