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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114793] [14 Regression] wrong code at -O1
 with "-fschedule-insns2 -fselective-scheduling2" on x86_64-linux-gnu (the
 generated code hangs)
Date: Sun, 21 Apr 2024 16:03:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114793

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Zhendong Su from comment #1)
> The following reproducer is different, but perhaps is the same or related.
>=20
> Compiler Explorer: https://godbolt.org/z/411rzMP1n
>=20
> [588] % gcctk -v
> Using built-in specs.
> COLLECT_GCC=3Dgcctk
> COLLECT_LTO_WRAPPER=3D/local/suz-local/software/local/gcc-trunk/libexec/g=
cc/
> x86_64-pc-linux-gnu/14.0.1/lto-wrapper
> Target: x86_64-pc-linux-gnu
> Configured with: ../gcc-trunk/configure --disable-bootstrap
> --enable-checking=3Dyes --prefix=3D/local/suz-local/software/local/gcc-tr=
unk
> --enable-sanitizers --enable-languages=3Dc,c++ --disable-werror
> --enable-multilib
> Thread model: posix
> Supported LTO compression algorithms: zlib
> gcc version 14.0.1 20240421 (experimental) (GCC)=20
> [589] %=20
> [589] % gcctk -O1 -fno-tree-forwprop -fselective-scheduling2
> -fschedule-insns2 -fsel-sched-pipelining small.c
> [590] % ./a.out
> Aborted
> [591] %=20
> [591] % cat small.c
> int printf(const char *, ...);
> int a, d, g, h;
> volatile int b =3D 1;
> static unsigned c =3D 1;
> char e, f =3D 1, i;
> static int j() {
>   int k, l =3D g, m =3D 1 << l, n =3D -e, o =3D -1 % ((f && 1) ^ i), p =
=3D ~n - o;
>   if (m) {
>     int q, s, t, r =3D 1 % (((1 % f) & (~e | c)) ^ b);
>     q =3D f;
>     s =3D i;
>     t =3D e;
>     f =3D -b;
>     k =3D f;
>     d =3D -1;
>   u:
>     e =3D 0 & b;
>     if (i > f)
>       if (!b)
>         goto v;
>     if (d > t)
>       __builtin_abort();
>     if (b < 1 || !d || !c) {
>       printf("%d\n", i);
>       f =3D ((i | b) & (k - r)) << (e << ~t ^ q) << s;
>       goto u;
>     }
>     if (i)
>       f =3D q;
>   v:
>     i =3D n & o & l;
>     printf("%ld\n", (long)t);
>   }
>   i =3D p;
>   return h;
> }
> int main() {
>   for (; a < 3; a++)
>     j();
>   return 0;
> }

This is caused by r14-2524.=