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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] wrong code at -O1 with
 "-fschedule-insns2 -fselective-scheduling2" on x86_64-linux-gnu (the
 generated code hangs)
Date: Sun, 21 Apr 2024 15:43:22 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114793

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jh at suse dot cz
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2024-04-21
            Version|unknown                     |14.0

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Zhendong Su from comment #0)
> It seems to be a recent regression as it does not reproduce with 13.2 and
> earlier.
>=20
> Compiler Explorer: https://godbolt.org/z/b3cc1MqP9
>=20
> [538] % 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
> [539] %=20
> [539] % gcctk -O0 small.c
> [540] % ./a.out
> [541] %=20
> [541] % gcctk -O1 -fschedule-insns2 -fselective-scheduling2 small.c
> [542] % timeout -s 9 10 ./a.out
> Killed
> [543] %=20
> [543] % cat small.c
> int printf(const char *, ...);
> volatile int a;
> int b, c, d =3D 1, e, f;
> int main() {
>   int g =3D 1;
>   for (; b; b -=3D d)
>     g =3D e;
>   for (; c < 2; c++) {
>     if (g) {
>       if (!d)
>         printf("%d", f);
>       continue;
>     }
>     a;
>   }
>   return 0;
> }

This is caused by r14-2712.=