CHECK_CXX_SOURCE_RUNS(
    "
    #ifndef __ALTIVEC__
    #error \"__ALTIVEC__ flag not set, no support for Altivec\"
    #endif
    #include <altivec.h>
    #undef vector
    #undef pixel
    #undef bool
    int main()
    {
    __vector double a, b, data1, data2;
    const int n_vectors = sizeof(a)/sizeof(double);
    double * ptr = reinterpret_cast<double*>(&a);
    ptr[0] = static_cast<volatile double>(1.0);
    for (int i=1; i<n_vectors; ++i)
      ptr[i] = 0.0;
    b = vec_splats (static_cast<volatile double>(2.25));
    data1 = vec_add (a, b);
    data2 = vec_mul (b, data1);
    ptr = reinterpret_cast<double*>(&data2);
    int return_value = 0;
    if (ptr[0] != 7.3125)
      return_value += 1;
    for (int i=1; i<n_vectors; ++i)
      if (ptr[i] != 5.0625)
        return_value += 2;
    b = vec_splats (static_cast<volatile double>(-1.0));
    data1 = vec_abs(vec_mul (b, data2));
    vec_vsx_st(data1, 0, ptr);
    b = vec_vsx_ld(0, ptr);
    ptr = reinterpret_cast<double*>(&b);
    if (ptr[0] != 7.3125)
      return_value += 4;
    for (int i=1; i<n_vectors; ++i)
      if (ptr[i] != 5.0625)
        return_value += 8;
    return return_value;
    }
    "
    DEAL_II_HAVE_ALTIVEC)