void prod_impl(const viennacl::toeplitz_matrix<SCALARTYPE, ALIGNMENT> & mat,
const viennacl::vector_base<SCALARTYPE> & vec,
viennacl::vector_base<SCALARTYPE> & result)
{
assert(mat.size1() == result.size());
assert(mat.size2() == vec.size());
viennacl::vector<SCALARTYPE> tmp(vec.size() * 4); tmp.clear();
viennacl::vector<SCALARTYPE> tmp2(vec.size() * 4);
viennacl::vector<SCALARTYPE> tep(mat.elements().size() * 2);
viennacl::linalg::real_to_complex(mat.elements(), tep, mat.elements().size());
viennacl::copy(vec.begin(), vec.end(), tmp.begin());
viennacl::linalg::real_to_complex(tmp, tmp2, vec.size() * 2);
viennacl::linalg::convolve(tep, tmp2, tmp);
viennacl::linalg::complex_to_real(tmp, tmp2, vec.size() * 2);
viennacl::copy(tmp2.begin(), tmp2.begin() + static_cast<vcl_ptrdiff_t>(vec.size()), result.begin());
}
void prod_impl(const viennacl::toeplitz_matrix<SCALARTYPE, ALIGNMENT> & mat,
const viennacl::vector<SCALARTYPE, VECTOR_ALIGNMENT> & vec,
viennacl::vector<SCALARTYPE, VECTOR_ALIGNMENT> & result)
{
assert(mat.size1() == result.size());
assert(mat.size2() == vec.size());
viennacl::vector<SCALARTYPE, VECTOR_ALIGNMENT> tmp(vec.size() * 4);
tmp.clear();
viennacl::vector<SCALARTYPE, VECTOR_ALIGNMENT> tmp2(vec.size() * 4);
viennacl::vector<SCALARTYPE, VECTOR_ALIGNMENT> tep(mat.elements().size() * 2);
viennacl::detail::fft::real_to_complex(mat.elements(), tep, mat.elements().size());
copy(vec, tmp);
viennacl::detail::fft::real_to_complex(tmp, tmp2, vec.size() * 2);
viennacl::linalg::convolve(tep, tmp2, tmp);
viennacl::detail::fft::complex_to_real(tmp, tmp2, vec.size() * 2);
copy(tmp2.begin(), tmp2.begin() + vec.size(), result.begin());
}