1 /*===---- complex - CUDA wrapper for <algorithm> ----------------------------=== 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to deal 5 * in the Software without restriction, including without limitation the rights 6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 * copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19 * THE SOFTWARE. 20 * 21 *===-----------------------------------------------------------------------=== 22 */ 23 24 #ifndef __CLANG_CUDA_WRAPPERS_ALGORITHM 25 #define __CLANG_CUDA_WRAPPERS_ALGORITHM 26 27 // This header defines __device__ overloads of std::min/max, but only if we're 28 // <= C++11. In C++14, these functions are constexpr, and so are implicitly 29 // __host__ __device__. 30 // 31 // We don't support the initializer_list overloads because 32 // initializer_list::begin() and end() are not __host__ __device__ functions. 33 // 34 // When compiling in C++14 mode, we could force std::min/max to have different 35 // implementations for host and device, by declaring the device overloads 36 // before the constexpr overloads appear. We choose not to do this because 37 38 // a) why write our own implementation when we can use one from the standard 39 // library? and 40 // b) libstdc++ is evil and declares min/max inside a header that is included 41 // *before* we include <algorithm>. So we'd have to unconditionally 42 // declare our __device__ overloads of min/max, but that would pollute 43 // things for people who choose not to include <algorithm>. 44 45 #include_next <algorithm> 46 47 #if __cplusplus <= 201103L 48 49 // We need to define these overloads in exactly the namespace our standard 50 // library uses (including the right inline namespace), otherwise they won't be 51 // picked up by other functions in the standard library (e.g. functions in 52 // <complex>). Thus the ugliness below. 53 #ifdef _LIBCPP_BEGIN_NAMESPACE_STD 54 _LIBCPP_BEGIN_NAMESPACE_STD 55 #else 56 namespace std { 57 #ifdef _GLIBCXX_BEGIN_NAMESPACE_VERSION 58 _GLIBCXX_BEGIN_NAMESPACE_VERSION 59 #endif 60 #endif 61 62 template <class __T, class __Cmp> 63 inline __device__ const __T & 64 max(const __T &__a, const __T &__b, __Cmp __cmp) { 65 return __cmp(__a, __b) ? __b : __a; 66 } 67 68 template <class __T> 69 inline __device__ const __T & 70 max(const __T &__a, const __T &__b) { 71 return __a < __b ? __b : __a; 72 } 73 74 template <class __T, class __Cmp> 75 inline __device__ const __T & 76 min(const __T &__a, const __T &__b, __Cmp __cmp) { 77 return __cmp(__b, __a) ? __b : __a; 78 } 79 80 template <class __T> 81 inline __device__ const __T & 82 min(const __T &__a, const __T &__b) { 83 return __a < __b ? __b : __a; 84 } 85 86 #ifdef _LIBCPP_END_NAMESPACE_STD 87 _LIBCPP_END_NAMESPACE_STD 88 #else 89 #ifdef _GLIBCXX_BEGIN_NAMESPACE_VERSION 90 _GLIBCXX_END_NAMESPACE_VERSION 91 #endif 92 } // namespace std 93 #endif 94 95 #endif // __cplusplus <= 201103L 96 #endif // __CLANG_CUDA_WRAPPERS_ALGORITHM 97
