CHECK_CXX_SOURCE_RUNS(
      "
      #ifndef __ARM_NEON
      #error Preprocessor flag not found
      #endif
      #include <arm_neon.h>
      #include <stdlib.h>
      int main()
      {
      float64x2_t a, b;
      const unsigned int vector_bytes = sizeof(float64x2_t);
      const int n_vectors = vector_bytes/sizeof(double);
      float64x2_t * data =
        reinterpret_cast<float64x2_t*>(aligned_alloc (vector_bytes, 2*vector_bytes));
      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 = vdupq_n_f64 (static_cast<volatile double>(2.25));
      data[0] = vaddq_f64 (a, b);
      data[1] = vmulq_f64 (b, data[0]);
      ptr = reinterpret_cast<double*>(&data[1]);
      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 = 1;
      free(data);
      return return_value;
      }
      "
      DEAL_II_HAVE_ARM_NEON)