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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102798] [9/10/11/12 Regression] wrong code
 with -O3 -fno-tree-pta by r9-2475
Date: Sat, 16 Oct 2021 18:46:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102798

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[9/10/11/12 Regression]     |[9/10/11/12 Regression]
                   |wrong code with -O3         |wrong code with -O3
                   |-fno-tree-pta -mavx512f by  |-fno-tree-pta by r9-2475
                   |r9-2475                     |

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is a testcase which fails without -mavx512


typedef __SIZE_TYPE__ size_t;

__attribute__((__noipa__))
void BUF_reverse (unsigned char *out, const unsigned char *in, size_t size)
{
  size_t i;
  if (in)
    {
      out +=3D size - 1;
      for (i =3D 0; i < size; i++)
        *out++ =3D *in++;
    }
  else
    {
      unsigned char *q;
      char c;
      q =3D out + size - 1;
      for (i =3D 0; i < size ; i++)
            {
              *out++ =3D 1;
            }
    }
}

int
main (void)
{
  unsigned char buf[40];
  unsigned char buf1[40];
  for (unsigned i =3D 0; i < sizeof (buf); i++)
    buf[i] =3D i;
  BUF_reverse (buf, 0, sizeof (buf));
  for (unsigned i =3D 0; i < sizeof (buf); i++)
    if (buf[i] !=3D 1)
      __builtin_abort ();

  return 0;
}=