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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/106830] [13 Regression] ICE: in tree_to_uhwi, at tree.cc:6392
 (from check_for_xor_used_as_pow) since r13-2386-gbedfca647a9e9c1a
Date: Tue, 06 Sep 2022 05:06:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106830

--- Comment #3 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Jakub Jelinek from comment #1)
> I certainly see a valgrind diagnostics on it:
> valgrind ./cc1 -quiet pr106830.c
> =3D=3D2461995=3D=3D Memcheck, a memory error detector
> =3D=3D2461995=3D=3D Copyright (C) 2002-2022, and GNU GPL'd, by Julian Sew=
ard et al.
> =3D=3D2461995=3D=3D Using Valgrind-3.19.0 and LibVEX; rerun with -h for c=
opyright
> info
> =3D=3D2461995=3D=3D Command: ./cc1 -quiet pr106830.c
> =3D=3D2461995=3D=3D=20
> pr106830.c:1:1: warning: return type defaults to =E2=80=98int=E2=80=99 [-=
Wimplicit-int]
>     1 | foo0_u16_0() {
>       | ^~~~~~~~~~
> pr106830.c: In function =E2=80=98foo0_u16_0=E2=80=99:
> pr106830.c:2:14: warning: integer constant is so large that it is unsigned
>     2 |   (__int128)(18302628885633695743 << 4) ^ 0;
>       |              ^~~~~~~~~~~~~~~~~~~~
> =3D=3D2461995=3D=3D Conditional jump or move depends on uninitialised val=
ue(s)
> =3D=3D2461995=3D=3D    at 0xAFCE3D: parser_build_binary_op(unsigned int, =
tree_code,
> c_expr, c_expr) (c-typeck.cc:3992)
> =3D=3D2461995=3D=3D    by 0xB4ABA2: c_parser_binary_expression(c_parser*,=
 c_expr*,
> tree_node*) (c-parser.cc:8083)
> =3D=3D2461995=3D=3D    by 0xB486A3: c_parser_conditional_expression(c_par=
ser*,
> c_expr*, tree_node*) (c-parser.cc:7651)
> =3D=3D2461995=3D=3D    by 0xB48308: c_parser_expr_no_commas(c_parser*, c_=
expr*,
> tree_node*) (c-parser.cc:7565)
>=20
> so pressumably arg1.m_decimal is uninitialized.
>=20

Ah right, my fault, I forgot to add --trace-children=3Dyes, and run valgrin=
d on
the gcc binary instead... thanks.=