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#include <thrust/functional.h>
#include <thrust/sort.h>
#include <unittest/unittest.h>
template <typename T>
struct greater_div_10
{
THRUST_HOST_DEVICE bool operator()(const T& lhs, const T& rhs) const
{
return ((int)lhs) / 10 > ((int)rhs) / 10;
}
};
template <unsigned int N>
void _TestStableSortByKeyWithLargeValues()
{
size_t n = (128 * 1024) / sizeof(FixedVector<int, N>);
thrust::host_vector<unsigned int> h_keys(n);
thrust::host_vector<FixedVector<int, N>> h_vals(n);
for (size_t i = 0; i < n; i++)
{
const auto uint_i = static_cast<unsigned int>(i);
const auto rand_int = unittest::generate_random_integer<unsigned int>()(uint_i);
h_keys[i] = rand_int;
h_vals[i] = FixedVector<int, N>(static_cast<int>(i));
}
thrust::device_vector<unsigned int> d_keys = h_keys;
thrust::device_vector<FixedVector<int, N>> d_vals = h_vals;
thrust::stable_sort_by_key(h_keys.begin(), h_keys.end(), h_vals.begin());
thrust::stable_sort_by_key(d_keys.begin(), d_keys.end(), d_vals.begin());
ASSERT_EQUAL_QUIET(h_keys, d_keys);
ASSERT_EQUAL_QUIET(h_vals, d_vals);
// so cuda::stable_merge_sort_by_key() is called
thrust::stable_sort_by_key(h_keys.begin(),
h_keys.end(),
h_vals.begin(),
greater_div_10<unsigned int>());
thrust::stable_sort_by_key(d_keys.begin(),
d_keys.end(),
d_vals.begin(),
greater_div_10<unsigned int>());
ASSERT_EQUAL_QUIET(h_keys, d_keys);
ASSERT_EQUAL_QUIET(h_vals, d_vals);
}
void TestStableSortByKeyWithLargeValues()
{
_TestStableSortByKeyWithLargeValues<4>();
_TestStableSortByKeyWithLargeValues<8>();
_TestStableSortByKeyWithLargeValues<16>();
}
DECLARE_UNITTEST(TestStableSortByKeyWithLargeValues);
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