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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/113287] wrong code with
 __builtin_mul_overflow_p() and _BitInt() with -O3 -msse4
Date: Tue, 09 Jan 2024 14:23:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113287

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
   Target Milestone|---                         |14.0

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Functionally what it does is
__attribute__((noipa)) void
bar (unsigned long *p)
{
  __builtin_memset (p, 0, 142 * sizeof (unsigned long));
  p[17] =3D 0x50000000000UL;
}

__attribute__((noipa)) int
foo (void)
{
  unsigned long r[142];
  bar (r);
  unsigned long v =3D ((long) r[0] >> 31);
  if (v + 1 > 1)
    return 1;
  for (unsigned long i =3D 1; i <=3D 140; ++i)
    if (r[i] !=3D v)
      return 1;
  unsigned long w =3D r[141];
  if ((unsigned long) (((long) (w << 60)) >> 60) !=3D v)
    return 1;
  return 0;
}

int
main ()
{
  if (foo () !=3D 1)
    __builtin_abort ();
}
but this doesn't abort.=