Kokkos Core Kernels Package  Version of the Day
Kokkos_Half.hpp
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44 
45 #ifndef KOKKOS_HALF_HPP_
46 #define KOKKOS_HALF_HPP_
47 
48 #include <type_traits>
49 #include <Kokkos_Macros.hpp>
50 
51 // Include special backend specific versions here
52 #include <Cuda/Kokkos_Cuda_Half.hpp>
53 
54 // Potentially include special compiler specific versions here
55 // e.g. for Intel
56 
57 // If none of the above actually did anything and defined a half precision type
58 // define a fallback implementation here using float
59 #ifndef KOKKOS_IMPL_HALF_TYPE_DEFINED
60 #define KOKKOS_IMPL_HALF_TYPE_DEFINED
61 #define KOKKOS_HALF_T_IS_FLOAT true
62 namespace Kokkos {
63 namespace Impl {
64 struct half_impl_t {
65  using type = float;
66 };
67 } // namespace Impl
68 namespace Experimental {
69 
70 using half_t = Kokkos::Impl::half_impl_t::type;
71 
72 // cast_to_half
73 KOKKOS_INLINE_FUNCTION
74 half_t cast_to_half(float val) { return half_t(val); }
75 KOKKOS_INLINE_FUNCTION
76 half_t cast_to_half(bool val) { return half_t(val); }
77 KOKKOS_INLINE_FUNCTION
78 half_t cast_to_half(double val) { return half_t(val); }
79 KOKKOS_INLINE_FUNCTION
80 half_t cast_to_half(short val) { return half_t(val); }
81 KOKKOS_INLINE_FUNCTION
82 half_t cast_to_half(unsigned short val) { return half_t(val); }
83 KOKKOS_INLINE_FUNCTION
84 half_t cast_to_half(int val) { return half_t(val); }
85 KOKKOS_INLINE_FUNCTION
86 half_t cast_to_half(unsigned int val) { return half_t(val); }
87 KOKKOS_INLINE_FUNCTION
88 half_t cast_to_half(long val) { return half_t(val); }
89 KOKKOS_INLINE_FUNCTION
90 half_t cast_to_half(unsigned long val) { return half_t(val); }
91 KOKKOS_INLINE_FUNCTION
92 half_t cast_to_half(long long val) { return half_t(val); }
93 KOKKOS_INLINE_FUNCTION
94 half_t cast_to_half(unsigned long long val) { return half_t(val); }
95 
96 // cast_from_half
97 // Using an explicit list here too, since the other ones are explicit and for
98 // example don't include char
99 template <class T>
100 KOKKOS_INLINE_FUNCTION std::enable_if_t<
101  std::is_same<T, float>::value || std::is_same<T, bool>::value ||
102  std::is_same<T, double>::value || std::is_same<T, short>::value ||
103  std::is_same<T, unsigned short>::value || std::is_same<T, int>::value ||
104  std::is_same<T, unsigned int>::value || std::is_same<T, long>::value ||
105  std::is_same<T, unsigned long>::value ||
106  std::is_same<T, long long>::value ||
107  std::is_same<T, unsigned long long>::value,
108  T>
109 cast_from_half(half_t val) {
110  return T(val);
111 }
112 
113 } // namespace Experimental
114 } // namespace Kokkos
115 
116 #else
117 #define KOKKOS_HALF_T_IS_FLOAT false
118 #endif // KOKKOS_IMPL_HALF_TYPE_DEFINED
119 #endif // KOKKOS_HALF_HPP_
Definition: dummy.cpp:3