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/*
* Copyright 2022 Patrick Stotko
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <vector>
#include <stdgpu/functional.h>
#include <stdgpu/numeric.h>
#include <stdgpu/platform.h>
class stdgpu_numeric : public ::testing::Test
{
protected:
// Called before each test
void
SetUp() override
{
}
// Called after each test
void
TearDown() override
{
}
};
TEST_F(stdgpu_numeric, iota)
{
const stdgpu::index_t N = static_cast<stdgpu::index_t>(pow(2, 22));
std::vector<stdgpu::index_t> indices_vector(static_cast<std::size_t>(N));
stdgpu::index_t* indices = indices_vector.data();
const stdgpu::index_t init = 42;
stdgpu::iota(stdgpu::execution::host, indices_vector.begin(), indices_vector.end(), init);
for (stdgpu::index_t i = 0; i < N; ++i)
{
EXPECT_EQ(indices[i], i + init);
}
}
class number_sequence
{
public:
explicit number_sequence(std::int64_t* numbers)
: _numbers(numbers)
{
}
STDGPU_HOST_DEVICE std::int64_t
operator()(const stdgpu::index_t i) const
{
return _numbers[i];
}
private:
std::int64_t* _numbers;
};
TEST_F(stdgpu_numeric, transform_reduce_index)
{
const stdgpu::index_t N = static_cast<stdgpu::index_t>(pow(2, 22));
std::vector<std::int64_t> numbers_vector(static_cast<std::size_t>(N));
std::int64_t* numbers = numbers_vector.data();
const std::int64_t init = 42;
stdgpu::iota(stdgpu::execution::host, numbers_vector.begin(), numbers_vector.end(), init);
const std::int64_t shift = 21;
std::int64_t shifted_sum = stdgpu::transform_reduce_index(stdgpu::execution::host,
N,
shift,
stdgpu::plus<>(),
number_sequence(numbers));
auto sum_closed_form = [](const std::int64_t n) { return n * (n + 1) / 2; };
EXPECT_EQ(shifted_sum,
shift + sum_closed_form(init - 1 + static_cast<std::int64_t>(N)) - sum_closed_form(init - 1));
}
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