1 #include <unittest/unittest.h>
2 #include <thrust/pair.h>
3 #include <thrust/sort.h>
4 #include <thrust/transform.h>
5 #include <thrust/sequence.h>
6 #include <thrust/execution_policy.h>
7
8
9 template<typename ExecutionPolicy, typename Iterator1, typename Iterator2, typename Iterator3>
10 __global__
stable_sort_by_key_kernel(ExecutionPolicy exec,Iterator1 keys_first,Iterator1 keys_last,Iterator2 values_first,Iterator3 is_supported)11 void stable_sort_by_key_kernel(ExecutionPolicy exec, Iterator1 keys_first, Iterator1 keys_last, Iterator2 values_first, Iterator3 is_supported)
12 {
13 #if (__CUDA_ARCH__ >= 200)
14 *is_supported = true;
15 thrust::stable_sort_by_key(exec, keys_first, keys_last, values_first);
16 #else
17 *is_supported = false;
18 #endif
19 }
20
21
22 struct make_pair_functor
23 {
24 template<typename T1, typename T2>
25 __host__ __device__
operator ()make_pair_functor26 thrust::pair<T1,T2> operator()(const T1 &x, const T2 &y)
27 {
28 return thrust::make_pair(x,y);
29 } // end operator()()
30 }; // end make_pair_functor
31
32
33 template<typename ExecutionPolicy>
TestPairStableSortByKeyDevice(ExecutionPolicy exec)34 void TestPairStableSortByKeyDevice(ExecutionPolicy exec)
35 {
36 size_t n = 10000;
37 typedef thrust::pair<int,int> P;
38
39 // host arrays
40 thrust::host_vector<int> h_p1 = unittest::random_integers<int>(n);
41 thrust::host_vector<int> h_p2 = unittest::random_integers<int>(n);
42 thrust::host_vector<P> h_pairs(n);
43
44 thrust::host_vector<int> h_values(n);
45 thrust::sequence(h_values.begin(), h_values.end());
46
47 // zip up pairs on the host
48 thrust::transform(h_p1.begin(), h_p1.end(), h_p2.begin(), h_pairs.begin(), make_pair_functor());
49
50 // device arrays
51 thrust::device_vector<P> d_pairs = h_pairs;
52 thrust::device_vector<int> d_values = h_values;
53
54 thrust::device_vector<bool> is_supported(1);
55
56 // sort on the device
57 stable_sort_by_key_kernel<<<1,1>>>(exec, d_pairs.begin(), d_pairs.end(), d_values.begin(), is_supported.begin());
58 cudaError_t const err = cudaDeviceSynchronize();
59 ASSERT_EQUAL(cudaSuccess, err);
60
61 if(is_supported[0])
62 {
63 // sort on the host
64 thrust::stable_sort_by_key(h_pairs.begin(), h_pairs.end(), h_values.begin());
65
66 ASSERT_EQUAL_QUIET(h_pairs, d_pairs);
67 ASSERT_EQUAL(h_values, d_values);
68 }
69 };
70
71
TestPairStableSortByKeyDeviceSeq()72 void TestPairStableSortByKeyDeviceSeq()
73 {
74 TestPairStableSortByKeyDevice(thrust::seq);
75 }
76 DECLARE_UNITTEST(TestPairStableSortByKeyDeviceSeq);
77
78
TestPairStableSortByKeyDeviceDevice()79 void TestPairStableSortByKeyDeviceDevice()
80 {
81 TestPairStableSortByKeyDevice(thrust::device);
82 }
83 DECLARE_UNITTEST(TestPairStableSortByKeyDeviceDevice);
84
85