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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#include <TestStdAlgorithmsCommon.hpp>
#include <utility>
#include <algorithm>
namespace Test {
namespace stdalgos {
namespace ShiftRight {
namespace KE = Kokkos::Experimental;
template <class ValueType>
struct UnifDist;
template <>
struct UnifDist<int> {
using dist_type = std::uniform_int_distribution<int>;
std::mt19937 m_gen;
dist_type m_dist;
UnifDist() : m_dist(-50, 50) { m_gen.seed(1034343); }
int operator()() { return m_dist(m_gen); }
};
template <>
struct UnifDist<double> {
using dist_type = std::uniform_real_distribution<double>;
std::mt19937 m_gen;
dist_type m_dist;
UnifDist() : m_dist(-90., 100.) { m_gen.seed(1034343); }
double operator()() { return m_dist(m_gen); }
};
template <class ViewType>
void fill_view(ViewType dest_view, const std::string& name) {
using value_type = typename ViewType::value_type;
using exe_space = typename ViewType::execution_space;
const std::size_t ext = dest_view.extent(0);
using aux_view_t = Kokkos::View<value_type*, exe_space>;
aux_view_t aux_view("aux_view", ext);
auto v_h = create_mirror_view(Kokkos::HostSpace(), aux_view);
if (name == "empty") {
// no op
}
else {
UnifDist<value_type> randObj;
for (std::size_t i = 0; i < ext; ++i) {
v_h(i) = randObj();
}
}
Kokkos::deep_copy(aux_view, v_h);
CopyFunctor<aux_view_t, ViewType> F1(aux_view, dest_view);
Kokkos::parallel_for("copy", dest_view.extent(0), F1);
}
template <class ForwardIterator>
ForwardIterator my_std_shift_right(
ForwardIterator first, ForwardIterator last,
typename std::iterator_traits<ForwardIterator>::difference_type n) {
// copied from
// https://github.com/llvm/llvm-project/blob/main/libcxx/include/__algorithm/shift_right.h
if (n == 0) {
return first;
}
decltype(n) d = last - first;
if (n >= d) {
return last;
}
ForwardIterator m = first + (d - n);
return std::move_backward(first, m, last);
}
template <class ViewType, class ResultIt, class ViewHostType>
void verify_data(ResultIt result_it, ViewType view, ViewHostType data_view_host,
std::size_t shift_value) {
auto std_rit = my_std_shift_right(KE::begin(data_view_host),
KE::end(data_view_host), shift_value);
// make sure results match
const auto my_diff = KE::end(view) - result_it;
const auto std_diff = KE::end(data_view_host) - std_rit;
ASSERT_EQ(my_diff, std_diff);
// check views match
auto view_h = create_host_space_copy(view);
auto it1 = KE::cbegin(view_h);
auto it2 = KE::cbegin(data_view_host);
for (std::size_t i = 0; i < (std::size_t)my_diff; ++i) {
ASSERT_EQ(it1[i], it2[i]);
// std::cout << "i= " << i << " "
// << "mine: " << it1[i] << " "
// << "std: " << it2[i]
// << '\n';
}
}
std::string value_type_to_string(int) { return "int"; }
std::string value_type_to_string(double) { return "double"; }
template <class Tag, class ValueType>
void print_scenario_details(const std::string& name, std::size_t shift_value) {
std::cout << "shift_right: "
<< " by " << shift_value << ", " << name << ", "
<< view_tag_to_string(Tag{}) << ", "
<< value_type_to_string(ValueType()) << std::endl;
}
template <class Tag, class ValueType, class InfoType>
void run_single_scenario(const InfoType& scenario_info,
std::size_t shift_value) {
const auto name = std::get<0>(scenario_info);
const std::size_t view_ext = std::get<1>(scenario_info);
// print_scenario_details<Tag, ValueType>(name, shift_value);
{
auto view =
create_view<ValueType>(Tag{}, view_ext, "shift_right_data_view");
fill_view(view, name);
// create host copy BEFORE shift_right or view will be modified
auto view_h = create_host_space_copy(view);
auto rit = KE::shift_right(exespace(), KE::begin(view), KE::end(view),
shift_value);
verify_data(rit, view, view_h, shift_value);
}
{
auto view =
create_view<ValueType>(Tag{}, view_ext, "shift_right_data_view");
fill_view(view, name);
// create host copy BEFORE shift_right or view will be modified
auto view_h = create_host_space_copy(view);
auto rit = KE::shift_right("label", exespace(), KE::begin(view),
KE::end(view), shift_value);
verify_data(rit, view, view_h, shift_value);
}
{
auto view =
create_view<ValueType>(Tag{}, view_ext, "shift_right_data_view");
fill_view(view, name);
// create host copy BEFORE shift_right or view will be modified
auto view_h = create_host_space_copy(view);
auto rit = KE::shift_right(exespace(), view, shift_value);
verify_data(rit, view, view_h, shift_value);
}
{
auto view =
create_view<ValueType>(Tag{}, view_ext, "shift_right_data_view");
fill_view(view, name);
// create host copy BEFORE shift_right or view will be modified
auto view_h = create_host_space_copy(view);
auto rit = KE::shift_right("label", exespace(), view, shift_value);
verify_data(rit, view, view_h, shift_value);
}
Kokkos::fence();
}
template <class Tag, class ValueType>
void run_all_scenarios() {
const std::map<std::string, std::size_t> scenarios = {{"empty", 0},
{"one-element-a", 1},
{"one-element-b", 1},
{"two-elements-a", 2},
{"two-elements-b", 2},
{"three-elements-a", 3},
{"three-elements-b", 3},
{"small-a", 11},
{"small-b", 13},
{"medium", 21103},
{"large", 101513}};
// a shift value MUST be non-negative but it does not matter
// if it is larger than the view, the algorithm is supposed
// to handle that case too
std::vector<std::size_t> shifts = {0, 1, 2, 3, 8, 56, 101, 1003, 101501};
for (const auto& it : scenarios) {
for (const auto& it2 : shifts) {
run_single_scenario<Tag, ValueType>(it, it2);
}
}
}
TEST(std_algorithms_mod_seq_ops, shift_right) {
run_all_scenarios<DynamicTag, int>();
run_all_scenarios<StridedThreeTag, int>();
run_all_scenarios<DynamicTag, double>();
run_all_scenarios<StridedThreeTag, double>();
}
} // namespace ShiftRight
} // namespace stdalgos
} // namespace Test
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