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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107160] [13 regression] r13-2641-g0ee1548d96884d  causes
 verification failure in spec2006
Date: Thu, 13 Oct 2022 12:01:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107160

--- Comment #13 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
A bit reduced test-case that can be compiled with cross compiler:

$ cat pr107160.c
#define N 16
float fl[N];

__attribute__ ((noipa, optimize (0))) void
init ()
{
  for (int i =3D 0; i < N; i++)
    fl[i] =3D 1 << i;
}

__attribute__ ((noipa)) float
foo (int n)
{
  float sum0, sum1, sum2, sum3;
  sum0 =3D sum1 =3D sum2 =3D sum3 =3D 0.0f;

  for (int i =3D 0; i < n; i +=3D 4)
    {
      sum0 +=3D __builtin_fabs (fl[i]);
      sum1 +=3D __builtin_fabs (fl[i + 1]);
      sum2 +=3D __builtin_fabs (fl[i + 2]);
      sum3 +=3D __builtin_fabs (fl[i + 3]);
    }

  return sum0 + sum1 + sum2 + sum3;
}

__attribute__ ((optimize (0))) int
main ()
{
  init ();
  float res =3D foo (N);
  __builtin_printf ("res:%f\n", res);
  return 0;
}

x86_64:
./a.out=20
res:65535.000000

ppc64le:
./a.out
res:15.000000

so the result is wrong, it sums only first 4 elements (and not 16).=