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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/108608] [12/13 Regression] AArch64 vectorizer
 ICE in vect_transform_reduction and __builtin_fmax
Date: Mon, 30 Jan 2023 22:14:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108608

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
#define N 64
extern double host_du[N][N][N][N];

int
foo (void)
{
  double max_rel_err =3D -1;
  const double rel_tol =3D __DBL_EPSILON__;
  for (int n =3D 0; n < N; n++)
    for (int k =3D 0; k < N; k++)
      for (int j =3D 0; j < N; j++)
        for (int i =3D 1; i < N - 1; i++) {
          const double analytic =3D 2.0 * (i + 1) * __builtin_pow((j + 2) *=
 (k +
3) * (n + 4), 2.0);
          const double err =3D host_du[n][k][j][i - 1] - analytic;
          max_rel_err =3D __builtin_fmax(__builtin_fabs(err / analytic),
max_rel_err);
        }
  return max_rel_err < rel_tol;
}

ICEs too at -O3.=