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Comparators.cuh
1 /**
2 * Copyright (c) 2015-present, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under the BSD+Patents license found in the
6 * LICENSE file in the root directory of this source tree.
7 */
8
9
10 #pragma once
11
12 #include <cuda.h>
13 #include "Float16.cuh"
14
15 namespace faiss { namespace gpu {
16
17 template <typename T>
18 struct Comparator {
19 __device__ static inline bool lt(T a, T b) {
20 return a < b;
21 }
22
23 __device__ static inline bool gt(T a, T b) {
24 return a > b;
25 }
26 };
27
28 #ifdef FAISS_USE_FLOAT16
29
30 template <>
31 struct Comparator<half> {
32 __device__ static inline bool lt(half a, half b) {
33 #if FAISS_USE_FULL_FLOAT16
34 return __hlt(a, b);
35 #else
36 return __half2float(a) < __half2float(b);
37 #endif // FAISS_USE_FULL_FLOAT16
38 }
39
40 __device__ static inline bool gt(half a, half b) {
41 #if FAISS_USE_FULL_FLOAT16
42 return __hgt(a, b);
43 #else
44 return __half2float(a) > __half2float(b);
45 #endif // FAISS_USE_FULL_FLOAT16
46 }
47 };
48
49 #endif // FAISS_USE_FLOAT16
50
51 } } // namespace
faiss::gpu::Comparator
Definition: Comparators.cuh:18