From: David Wells Date: Thu, 27 Aug 2020 22:12:39 +0000 (-0400) Subject: Use contiguous arrays for some polynomial classes. X-Git-Tag: v9.3.0-rc1~1160^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=512d1c04f0e97a1e0582b3d0c301088a3dfb773a;p=dealii.git Use contiguous arrays for some polynomial classes. This is nicer than std::vector>>. --- diff --git a/source/base/tensor_product_polynomials.cc b/source/base/tensor_product_polynomials.cc index 77e1460672..7741c9877c 100644 --- a/source/base/tensor_product_polynomials.cc +++ b/source/base/tensor_product_polynomials.cc @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -522,9 +523,9 @@ AnisotropicPolynomials::compute_grad(const unsigned int i, // uni-directional derivatives at // the given point in each // co-ordinate direction - std::vector> v(dim, std::vector(2)); + std::array, dim> v; for (unsigned int d = 0; d < dim; ++d) - polynomials[d][indices[d]].value(p(d), v[d]); + polynomials[d][indices[d]].value(p(d), 1, v[d].data()); Tensor<1, dim> grad; for (unsigned int d = 0; d < dim; ++d) @@ -546,9 +547,9 @@ AnisotropicPolynomials::compute_grad_grad(const unsigned int i, std::array indices; compute_index(i, indices); - std::vector> v(dim, std::vector(3)); + std::array, dim> v; for (unsigned int d = 0; d < dim; ++d) - polynomials[d][indices[d]].value(p(d), v[d]); + polynomials[d][indices[d]].value(p(d), 2, v[d].data()); Tensor<2, dim> grad_grad; for (unsigned int d1 = 0; d1 < dim; ++d1) @@ -621,16 +622,17 @@ AnisotropicPolynomials::evaluate( // derivatives, if necessary) of // all polynomials at this // evaluation point - std::vector>> v(dim); + std::size_t max_n_polynomials = 0; for (unsigned int d = 0; d < dim; ++d) - { - v[d].resize(polynomials[d].size()); - for (unsigned int i = 0; i < polynomials[d].size(); ++i) - { - v[d][i].resize(n_values_and_derivatives, 0.); - polynomials[d][i].value(p(d), v[d][i]); - } - } + max_n_polynomials = std::max(max_n_polynomials, polynomials[d].size()); + + // 5 is enough to store values and derivatives in all supported cases + Table<2, std::array> v(dim, max_n_polynomials); + for (unsigned int d = 0; d < dim; ++d) + for (unsigned int i = 0; i < polynomials[d].size(); ++i) + polynomials[d][i].value(p(d), + n_values_and_derivatives - 1, + v(d, i).data()); for (unsigned int i = 0; i < this->n(); ++i) { @@ -645,7 +647,7 @@ AnisotropicPolynomials::evaluate( { values[i] = 1; for (unsigned int x = 0; x < dim; ++x) - values[i] *= v[x][indices[x]][0]; + values[i] *= v(x, indices[x])[0]; } if (update_grads) @@ -653,7 +655,7 @@ AnisotropicPolynomials::evaluate( { grads[i][d] = 1.; for (unsigned int x = 0; x < dim; ++x) - grads[i][d] *= v[x][indices[x]][d == x ? 1 : 0]; + grads[i][d] *= v(x, indices[x])[d == x ? 1 : 0]; } if (update_grad_grads) @@ -669,7 +671,7 @@ AnisotropicPolynomials::evaluate( if (d2 == x) ++derivative; - grad_grads[i][d1][d2] *= v[x][indices[x]][derivative]; + grad_grads[i][d1][d2] *= v(x, indices[x])[derivative]; } } @@ -690,7 +692,7 @@ AnisotropicPolynomials::evaluate( ++derivative; third_derivatives[i][d1][d2][d3] *= - v[x][indices[x]][derivative]; + v(x, indices[x])[derivative]; } } @@ -714,7 +716,7 @@ AnisotropicPolynomials::evaluate( ++derivative; fourth_derivatives[i][d1][d2][d3][d4] *= - v[x][indices[x]][derivative]; + v(x, indices[x])[derivative]; } } }