printf("%s:%d: %s modf(%La) want %La,%La got %La,%La, ulperr %.3f = %a + %a, %.3f = %a + %a\n",
p->file, p->line, rstr(p->r), p->x, p->y, p->y2, y, yi, d, d-p->dy, p->dy, di, di-p->dy2, p->dy2);
err++;
printf("%s:%d: %s modf(%La) want %La,%La got %La,%La, ulperr %.3f = %a + %a, %.3f = %a + %a\n",
p->file, p->line, rstr(p->r), p->x, p->y, p->y2, y, yi, d, d-p->dy, p->dy, di, di-p->dy2, p->dy2);
err++;