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From: "liuhongt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113576] [14 regression] 502.gcc_r hangs 
 r14-8223-g1c1853a70f9422169190e65e568dcccbce02d95c
Date: Fri, 26 Jan 2024 05:43:44 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113576

--- Comment #22 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
typedef unsigned long mp_limb_t;
typedef long mp_size_t;
typedef unsigned long mp_bitcnt_t;

typedef mp_limb_t *mp_ptr;
typedef const mp_limb_t *mp_srcptr;

#define GMP_LIMB_BITS (sizeof(mp_limb_t) * 8)

#define GMP_LIMB_MAX (~ (mp_limb_t) 0)

mp_bitcnt_t
__attribute__((noipa))
mpn_common_scan (mp_limb_t limb, mp_size_t i, mp_srcptr up, mp_size_t un,
                 mp_limb_t ux)
{
  unsigned cnt;

  while (limb =3D=3D 0)
    {
      i++;
      if (i =3D=3D un)
        return (ux =3D=3D 0 ? ~(mp_bitcnt_t) 0 : un * GMP_LIMB_BITS);
      limb =3D ux ^ up[i];
    }
  return limb;
}

int main ()
{
  mp_limb_t up[10000];
  for (int i =3D 0; i !=3D 10000; i++)
    up[i] =3D 1 << 8;
  up[2000] =3D 1;
  mp_bitcnt_t res =3D mpn_common_scan (0, 0, up, 10000, 1 << 8);
  if (res !=3D 257)
    __builtin_abort ();
  return 1;
}


aborted with -O3 -march=3Dskylake-avx512.=