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mfem/fem/dfem/qfunction_transform.hpp
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// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-806117.
//
// This file is part of the MFEM library. For more information and source code
// availability visit https://mfem.org.
//
// MFEM is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
#pragma once
#include "util.hpp"
#include "../../linalg/tensor.hpp"
namespace mfem::future
{
template <typename T0, typename T1, typename T2>
MFEM_HOST_DEVICE
void process_qf_arg(const T0 &, const T1 &, T2 &)
{
static_assert(dfem::always_false<T0, T1, T2>,
"process_qf_arg not implemented for arg type");
}
template <typename T>
MFEM_HOST_DEVICE
void process_qf_arg(
const DeviceTensor<1, T> &u,
const DeviceTensor<1, T> &v,
T &arg)
{
arg = u(0);
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
tensor<dual<T, T>, n, m> &arg)
{
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
arg(j, i).value = u((i * n) + j);
}
}
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
dual<T, T> &arg)
{
arg.value = u(0);
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
const DeviceTensor<1> &v,
dual<T, T> &arg)
{
arg.value = u(0);
arg.gradient = v(0);
}
template <typename T, int n>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
const DeviceTensor<1> &v,
tensor<dual<T, T>, n> &arg)
{
for (int i = 0; i < n; i++)
{
arg(i).value = u(i);
arg(i).gradient = v(i);
}
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
const DeviceTensor<1> &v,
tensor<dual<T, T>, n, m> &arg)
{
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
arg(j, i).value = u((i * n) + j);
arg(j, i).gradient = v((i * n) + j);
}
}
}
template <typename T, int n>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1, T> &r,
const tensor<dual<T, T>, n> &x)
{
for (size_t i = 0; i < n; i++)
{
r(i) = x(i).value;
}
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1, T> &r,
const tensor<dual<T, T>, n, m> &x)
{
for (size_t i = 0; i < n; i++)
{
for (size_t j = 0; j < m; j++)
{
r(i + n * j) = x(i, j).value;
}
}
}
template <typename arg_type>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<2> &u,
const DeviceTensor<2> &v,
arg_type &arg,
const int &qp)
{
const auto u_qp = Reshape(&u(0, qp), u.GetShape()[0]);
const auto v_qp = Reshape(&v(0, qp), v.GetShape()[0]);
process_qf_arg(u_qp, v_qp, arg);
}
template <size_t num_fields, typename qf_args>
MFEM_HOST_DEVICE inline
void process_qf_args(
const std::array<DeviceTensor<2>, num_fields> &u,
const std::array<DeviceTensor<2>, num_fields> &v,
qf_args &args,
const int &qp)
{
for_constexpr<tuple_size<qf_args>::value>([&](auto i)
{
process_qf_arg(u[i], v[i], get<i>(args), qp);
});
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_derivative_from_native_dual(
DeviceTensor<1, T> &r,
const tensor<dual<T, T>, n, m> &x)
{
for (size_t i = 0; i < n; i++)
{
for (size_t j = 0; j < m; j++)
{
r(i + n * j) = x(i, j).gradient;
}
}
}
template <typename T, int n>
MFEM_HOST_DEVICE inline
void process_derivative_from_native_dual(
DeviceTensor<1, T> &r,
const tensor<dual<T, T>, n> &x)
{
for (size_t i = 0; i < n; i++)
{
r(i) = x(i).gradient;
}
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_derivative_from_native_dual(
DeviceTensor<1, T> &r,
const dual<T, T> &x)
{
r(0) = x.gradient;
}
template <typename T0, typename T1>
MFEM_HOST_DEVICE inline
void process_qf_arg(const T0 &, T1 &)
{
static_assert(dfem::always_false<T0, T1>,
"process_qf_arg not implemented for arg type");
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1, T> &u,
T &arg)
{
arg = u(0);
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1, T> &u,
tensor<T> &arg)
{
arg(0) = u(0);
}
template <typename T, int n>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
tensor<T, n> &arg)
{
for (int i = 0; i < n; i++)
{
arg(i) = u(i);
}
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1> &u,
tensor<T, n, m> &arg)
{
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
arg(j, i) = u((i * n) + j);
}
}
}
template <typename arg_type>
MFEM_HOST_DEVICE inline
void process_qf_arg(const DeviceTensor<2> &u, arg_type &arg, int qp)
{
const auto u_qp = Reshape(&u(0, qp), u.GetShape()[0]);
process_qf_arg(u_qp, arg);
}
template <size_t num_fields, typename qf_args>
MFEM_HOST_DEVICE inline
void process_qf_args(
const std::array<DeviceTensor<2>, num_fields> &u,
qf_args &args,
const int &qp)
{
for_constexpr<tuple_size<qf_args>::value>([&](auto i)
{
process_qf_arg(u[i], get<i>(args), qp);
});
}
template <typename T0, typename T1>
MFEM_HOST_DEVICE inline
Vector process_qf_result(T0, T1)
{
static_assert(dfem::always_false<T0, T1>,
"process_qf_result not implemented for result type");
return Vector{};
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1, T> &r,
const T &x)
{
r(0) = x;
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1> &r,
const dual<T, T> &x)
{
r(0) = x.value;
}
template <typename T>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1, T> &r,
const tensor<T> &x)
{
r(0) = x(0);
}
template <typename T, int n>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1, T> &r,
const tensor<T, n> &x)
{
for (size_t i = 0; i < n; i++)
{
r(i) = x(i);
}
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_qf_result(
DeviceTensor<1, T> &r,
const tensor<T, n, m> &x)
{
for (size_t i = 0; i < n; i++)
{
for (size_t j = 0; j < m; j++)
{
r(i + n * j) = x(i, j);
}
}
}
template <typename T, int n, int m>
MFEM_HOST_DEVICE inline
void process_qf_arg(
const DeviceTensor<1, T> &u,
const DeviceTensor<1, T> &v,
tensor<T, n, m> &arg)
{
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
arg(j, i) = u((i * n) + j);
}
}
}
} // namespace mfem::future