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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114425] wrong code with _BitInt()
 __builtin_add_overflow_p() and __builtin_mul_overflow_p() at -O2
Date: Fri, 22 Mar 2024 11:50:56 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114425

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Strangely it is dependent on the printf loop, without that it works fine.

Slightly adjusted testcase:

#if __BITINT_MAXWIDTH__ >=3D 2000
_BitInt(8) a;
_BitInt(300) b;
_BitInt(2000) c;

unsigned
foo (_BitInt(2000) d)
{
  int o =3D __builtin_add_overflow_p (d, 0, b);
  _BitInt(2000) m =3D c * a;
  unsigned u =3D m;
  return u + o;
}

__attribute__((noipa)) void
bar (int x)
{
  (void) x;
}
#endif

int
main ()
{
#if __BITINT_MAXWIDTH__ >=3D 2000
  unsigned x =3D foo
(0xfa7ac16f2613255eeb217e871c1f02221e26ce11f82d6a33206ec0ad5d4414722019933c=
0e2wb);
  for (unsigned i =3D 0; i < sizeof (x); i++)
    bar (((volatile unsigned char *) &x)[i]);
  if (x !=3D 1)
    __builtin_abort ();
#endif
}=