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From: "jiajing_zheng at 163 dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113709] New: User -fno-thread-jumps gave Floating
 point exception at -O2, -O3, -Os
Date: Thu, 01 Feb 2024 18:30:24 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 12.2.0
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X-Bugzilla-Who: jiajing_zheng at 163 dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113709

            Bug ID: 113709
           Summary: User -fno-thread-jumps gave Floating point exception
                    at -O2, -O3, -Os
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jiajing_zheng at 163 dot com
  Target Milestone: ---

With -fno-thread-jumps option, GCC-12.2.0 at -O2, O3, -Os optimization leve=
ls
generated the 'Floating point exception (core dumped)' message.

jing@jing-ubuntu:~$ cat source.c=20
static unsigned int A =3D 20;
static unsigned int B =3D 1;

int main(void) {
  int i;
  for (i =3D 0; i < 2; i++) {
    A *=3D (B / (A ? A : 3)) / (A ? A : 5);
  }
  return 0;
}

jing@jing-ubuntu:~$ gcc source.c -O0 -fno-thread-jumps && ./a.out
jing@jing-ubuntu:~$ gcc source.c -O1 -fno-thread-jumps && ./a.out
jing@jing-ubuntu:~$ gcc source.c -O2 -fno-thread-jumps && ./a.out
Floating point exception (core dumped)
jing@jing-ubuntu:~$ gcc source.c -O3 -fno-thread-jumps && ./a.out
Floating point exception (core dumped)
jing@jing-ubuntu:~$ gcc source.c -Os -fno-thread-jumps && ./a.out
Floating point exception (core dumped)


jing@jing-ubuntu:~$ gcc -v
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/home/jing/gcc-12.2.0/usr/local/bin/../libexec/gcc/x8=
6_64-pc-linux-gnu/12.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure -enable-checking=3Drelease -enable-languages=
=3Dc,c++
-disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.2.0 (GCC)=