https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108608
--- 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 = -1;
const double rel_tol = __DBL_EPSILON__;
for (int n = 0; n < N; n++)
for (int k = 0; k < N; k++)
for (int j = 0; j < N; j++)
for (int i = 1; i < N - 1; i++) {
const double analytic = 2.0 * (i + 1) * __builtin_pow((j + 2) * (k +
3) * (n + 4), 2.0);
const double err = host_du[n][k][j][i - 1] - analytic;
max_rel_err = __builtin_fmax(__builtin_fabs(err / analytic),
max_rel_err);
}
return max_rel_err < rel_tol;
}
ICEs too at -O3.
