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/*
* GridTools
*
* Copyright (c) 2014-2023, ETH Zurich
* All rights reserved.
*
* Please, refer to the LICENSE file in the root directory.
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <gtest/gtest.h>
#include <gridtools/fn/cartesian.hpp>
#include <gridtools/stencil/global_parameter.hpp>
#include <fn_select.hpp>
#include <nvcc_workarounds.hpp>
#include <test_environment.hpp>
#include "../vertical_advection_repository.hpp"
namespace {
using namespace gridtools;
using namespace fn;
using namespace cartesian;
using namespace literals;
using stencil::global_parameter;
struct u_forward_scan : fwd {
static GT_FUNCTION constexpr auto prologue() {
return nvcc_workarounds::make_1_tuple(scan_pass(
[](auto /*acc*/,
auto const &utens_stage,
auto const &utens,
auto const &u_stage,
auto const &u_pos,
auto const &wcon,
auto const &dtr_stage) {
constexpr auto i = dim::i();
constexpr auto k = dim::k();
using float_t = std::decay_t<decltype(deref(wcon))>;
auto gcv = float_t(0.25) * (deref(shift(wcon, i, 1, k, 1)) + deref(shift(wcon, k, 1)));
auto cs = gcv * float_t(BET_M);
auto c = gcv * float_t(BET_P);
auto b = deref(dtr_stage) - c;
auto correction = -cs * (deref(shift(u_stage, k, 1)) - deref(u_stage));
auto d = deref(dtr_stage) * deref(u_pos) + deref(utens) + deref(utens_stage) + correction;
auto divided = float_t(1) / b;
return make_tuple(c * divided, d * divided);
},
host_device::identity()));
}
static GT_FUNCTION constexpr auto body() {
return scan_pass(
[](auto acc,
auto const &utens_stage,
auto const &utens,
auto const &u_stage,
auto const &u_pos,
auto const &wcon,
auto const &dtr_stage) {
constexpr auto i = dim::i();
constexpr auto k = dim::k();
using float_t = std::decay_t<decltype(deref(wcon))>;
auto gav = -float_t(0.25) * (deref(shift(wcon, i, 1)) + deref(wcon));
auto gcv = float_t(0.25) * (deref(shift(wcon, i, 1, k, 1)) + deref(shift(wcon, k, 1)));
auto as = gav * float_t(BET_M);
auto cs = gcv * float_t(BET_M);
auto a = gav * float_t(BET_P);
auto c = gcv * float_t(BET_P);
auto b = deref(dtr_stage) - a - c;
auto correction = -as * (deref(shift(u_stage, k, -1)) - deref(u_stage)) -
cs * (deref(shift(u_stage, k, -1)) - deref(u_stage));
auto d = deref(dtr_stage) * deref(u_pos) + deref(utens) + deref(utens_stage) + correction;
auto [cp, dp] = acc;
auto divided = float_t(1) / (b - cp * a);
return make_tuple(c * divided, (d - dp * a) * divided);
},
host_device::identity());
}
static GT_FUNCTION constexpr auto epilogue() {
return nvcc_workarounds::make_1_tuple(scan_pass(
[](auto acc,
auto const &utens_stage,
auto const &utens,
auto const &u_stage,
auto const &u_pos,
auto const &wcon,
auto const &dtr_stage) {
constexpr auto i = dim::i();
constexpr auto k = dim::k();
using float_t = std::decay_t<decltype(deref(wcon))>;
auto gav = -float_t(0.25) * (deref(shift(wcon, i, 1)) + deref(wcon));
auto as = gav * float_t(BET_M);
auto a = gav * float_t(BET_P);
auto b = deref(dtr_stage) - a;
auto correction = -as * (deref(shift(u_stage, k, -1)) - deref(u_stage));
auto d = deref(dtr_stage) * deref(u_pos) + deref(utens) + deref(utens_stage) + correction;
auto [cp, dp] = acc;
auto divided = float_t(1) / (b - cp * a);
return make_tuple(float_t(0), (d - dp * a) * divided);
},
host_device::identity()));
}
};
struct u_backward_scan : bwd {
static GT_FUNCTION constexpr auto prologue() {
return nvcc_workarounds::make_1_tuple(scan_pass(
[](auto /*acc*/, auto const &cd, auto const &u_pos, auto const &dtr_stage) {
auto d = tuple_get(1_c, deref(cd));
return make_tuple(deref(dtr_stage) * (d - deref(u_pos)), d);
},
[](auto const &acc) { return tuple_get(0_c, acc); }));
}
static GT_FUNCTION constexpr auto body() {
return scan_pass(
[](auto acc, auto const &cd, auto const &u_pos, auto const &dtr_stage) {
auto [c, d] = deref(cd);
auto data = d - c * tuple_get(1_c, acc);
return tuple(deref(dtr_stage) * (data - deref(u_pos)), data);
},
[](auto const &acc) { return tuple_get(0_c, acc); });
}
};
constexpr inline auto vadv_solver = [](auto &&executor,
auto &cd,
auto &utens_stage,
auto const &utens,
auto const &u_stage,
auto const &u_pos,
auto const &wcon,
auto const &dtr_stage) {
using float_t = sid::element_type<decltype(utens_stage)>;
executor()
.arg(cd)
.arg(utens_stage)
.arg(utens)
.arg(u_stage)
.arg(u_pos)
.arg(wcon)
.arg(dtr_stage)
.assign(0_c, u_forward_scan(), tuple<float_t, float_t>(0, 0), 1_c, 2_c, 3_c, 4_c, 5_c, 6_c)
.assign(1_c, u_backward_scan(), tuple<float_t, float_t>(0, 0), 0_c, 4_c, 6_c)
.execute();
};
GT_REGRESSION_TEST(fn_cartesian_vertical_advection, vertical_test_environment<3>, fn_backend_t) {
using float_t = typename TypeParam::float_t;
vertical_advection_repository repo{TypeParam::d(0), TypeParam::d(1), TypeParam::d(2)};
auto fencil = [](int i,
int j,
int k,
auto &utens_stage,
auto const &utens,
auto const &u_stage,
auto const &u_pos,
auto const &wcon,
auto const &dtr_stage) {
using sizes_t = hymap::keys<dim::i, dim::j, dim::k>::values<int, int, int>;
auto be = fn_backend_t();
auto domain = cartesian_domain(sizes_t(i - 6, j - 6, k), sizes_t(3, 3, 0));
auto backend = make_backend(be, domain);
auto alloc = tmp_allocator(be);
auto cd = allocate_global_tmp<tuple<float_t, float_t>>(alloc, sizes_t(i, j, k));
vadv_solver(backend.vertical_executor(), cd, utens_stage, utens, u_stage, u_pos, wcon, dtr_stage);
};
auto utens_stage = TypeParam::make_storage(repo.utens_stage_in);
auto comp = [&,
utens = TypeParam::make_storage(repo.utens),
u_stage = TypeParam::make_storage(repo.u_stage),
u_pos = TypeParam::make_storage(repo.u_pos),
wcon = TypeParam::make_storage(repo.wcon),
dtr_stage = stencil::global_parameter(float_t(repo.dtr_stage))] {
fencil(
TypeParam::d(0), TypeParam::d(1), TypeParam::d(2), utens_stage, utens, u_stage, u_pos, wcon, dtr_stage);
};
comp();
TypeParam::verify(repo.utens_stage_out, utens_stage);
TypeParam::benchmark("fn_cartesian_vertical_advection", comp);
}
} // namespace
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