Vc  1.4.2
SIMD Vector Classes for C++
operators.h
1 /* This file is part of the Vc library. {{{
2 Copyright © 2012-2016 Matthias Kretz <kretz@kde.org>
3 
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26 }}}*/
27 
28 #ifndef COMMON_OPERATORS_H_
29 #define COMMON_OPERATORS_H_
30 #include "simdarray.h"
31 #include "macros.h"
32 
33 namespace Vc_VERSIONED_NAMESPACE
34 {
35 namespace Detail
36 {
37 template <typename T, typename Abi, typename U>
38 enable_if<!std::is_same<T, U>::value, U> is_convertible_to_any_vector(Vector<U, Abi>);
39 template <typename T, typename Abi> T is_convertible_to_any_vector(Vector<T, Abi>);
40 
41 template <typename T, typename U, bool = std::is_integral<T>::value,
42  bool = std::is_integral<U>::value>
43 struct FundamentalReturnType;
44 template <class T, class U>
45 using fundamental_return_t = typename FundamentalReturnType<T, U>::type;
46 
47 template <typename T, typename U> struct FundamentalReturnType<T, U, false, false> {
48  using type = typename std::conditional<
49  std::is_arithmetic<U>::value,
50  typename std::conditional<(sizeof(T) < sizeof(U)), U, T>::type,
51  // U is not arithmetic, e.g. an enum or a type with e.g. operator int()
52  T>::type;
53 };
54 template <typename T, typename U> struct FundamentalReturnType<T, U, true, false> {
55  using type = typename std::conditional<
56  std::is_arithmetic<U>::value, U,
57  // U is not arithmetic, e.g. an enum or a type with e.g. operator int()
58  T>::type;
59 };
60 template <typename T, typename U> struct FundamentalReturnType<T, U, false, true> {
61  using type = T;
62 };
63 
64 template <typename T> struct my_make_signed : public std::make_signed<T> {
65 };
66 template <> struct my_make_signed<bool> {
67  using type = bool;
68 };
69 
70 template <typename TT, typename UU>
71 struct higher_conversion_rank {
72  template <typename A>
73  using fix_sign =
74  typename std::conditional<(std::is_unsigned<TT>::value ||
75  std::is_unsigned<UU>::value),
76  typename std::make_unsigned<A>::type, A>::type;
77  using T = typename my_make_signed<TT>::type;
78  using U = typename my_make_signed<UU>::type;
79  template <typename Test, typename Otherwise>
80  using c = typename std::conditional<std::is_same<T, Test>::value ||
81  std::is_same<U, Test>::value,
82  Test, Otherwise>::type;
83 
84  using type = fix_sign<c<long long, c<long, c<int, c<short, c<signed char, void>>>>>>;
85 };
86 
87 template <typename T, typename U> struct FundamentalReturnType<T, U, true, true> {
88  template <bool B, class Then, class E>
89  using c = typename std::conditional<B, Then, E>::type;
90  using type =
91  c<(sizeof(T) > sizeof(U)), T,
92  c<(sizeof(T) < sizeof(U)), U, typename higher_conversion_rank<T, U>::type>>;
93 };
94 
95 template <class V, class T, class Tq, class = void> struct ReturnTypeImpl {
96  // no type => SFINAE
97 };
98 // 1. Vector × Vector
99 template <class T, class U, class Abi, class Uq>
100 struct ReturnTypeImpl<Vector<T, Abi>, Vector<U, Abi>, Uq, void> {
101  using type = Vc::Vector<fundamental_return_t<T, U>, Abi>;
102 };
103 // 2. Vector × int
104 template <class T, class Abi, class Uq>
105 struct ReturnTypeImpl<Vector<T, Abi>, int, Uq, void> {
106  // conversion from int is always allowed (because its the default when you hardcode a
107  // number)
108  using type = Vc::Vector<T, Abi>;
109 };
110 // 3. Vector × unsigned
111 template <class T, class Abi, class Uq>
112 struct ReturnTypeImpl<Vector<T, Abi>, uint, Uq, void> {
113  // conversion from unsigned int is allowed for all integral Vector<T>, but ensures
114  // unsigned result
115  using type = Vc::Vector<
116  typename std::conditional<std::is_integral<T>::value, std::make_unsigned<T>,
117  std::enable_if<true, T>>::type::type,
118  Abi>;
119 };
120 // 4. Vector × {enum, arithmetic}
121 template <class T, class U, class Abi, class Uq>
122 struct ReturnTypeImpl<
123  Vector<T, Abi>, U, Uq,
124  enable_if<!std::is_class<U>::value && !std::is_same<U, int>::value &&
125  !std::is_same<U, uint>::value &&
126  Traits::is_valid_vector_argument<fundamental_return_t<T, U>>::value,
127  void>> {
128  using type = Vc::Vector<fundamental_return_t<T, U>, Abi>;
129 };
130 // 5. Vector × UDT
131 template <class T, class U, class Abi, class Uq>
132 struct ReturnTypeImpl<
133  Vector<T, Abi>, U, Uq,
134  enable_if<std::is_class<U>::value && !Traits::is_simd_vector<U>::value &&
135  Traits::is_valid_vector_argument<decltype(
136  is_convertible_to_any_vector<T, Abi>(std::declval<Uq>()))>::value,
137  void>> {
138  using type =
139  Vc::Vector<fundamental_return_t<T, decltype(is_convertible_to_any_vector<T, Abi>(
140  std::declval<Uq>()))>,
141  Abi>;
142 };
143 template <class V, class Tq, class T = remove_cvref_t<Tq>>
144 using ReturnType = typename ReturnTypeImpl<V, T, Tq>::type;
145 
146 template <class T> struct is_a_type : public std::true_type {
147 };
148 
149 #ifdef Vc_ENABLE_FLOAT_BIT_OPERATORS
150 #define Vc_TEST_FOR_BUILTIN_OPERATOR(op_) true
151 #else
152 #define Vc_TEST_FOR_BUILTIN_OPERATOR(op_) \
153  Detail::is_a_type<decltype(std::declval<typename R::value_type>() \
154  op_ std::declval<typename R::value_type>())>::value
155 #endif
156 } // namespace Detail
157 
158 #define Vc_GENERIC_OPERATOR(op_) \
159  template <class T, class Abi, class U, \
160  class R = Detail::ReturnType<Vector<T, Abi>, U>> \
161  Vc_ALWAYS_INLINE enable_if<Vc_TEST_FOR_BUILTIN_OPERATOR(op_) && \
162  std::is_convertible<Vector<T, Abi>, R>::value && \
163  std::is_convertible<U, R>::value, \
164  R> \
165  operator op_(Vector<T, Abi> x, U &&y) \
166  { \
167  return Detail::operator op_(R(x), R(std::forward<U>(y))); \
168  } \
169  template <class T, class Abi, class U, \
170  class R = Detail::ReturnType<Vector<T, Abi>, U>> \
171  Vc_ALWAYS_INLINE enable_if<Vc_TEST_FOR_BUILTIN_OPERATOR(op_) && \
172  !Traits::is_simd_vector<U>::value && \
173  std::is_convertible<Vector<T, Abi>, R>::value && \
174  std::is_convertible<U, R>::value, \
175  R> \
176  operator op_(U &&x, Vector<T, Abi> y) \
177  { \
178  return Detail::operator op_(R(std::forward<U>(x)), R(y)); \
179  } \
180  template <class T, class Abi, class U, \
181  class R = Detail::ReturnType<Vector<T, Abi>, U>> \
182  Vc_ALWAYS_INLINE enable_if<Vc_TEST_FOR_BUILTIN_OPERATOR(op_) && \
183  std::is_convertible<Vector<T, Abi>, R>::value && \
184  std::is_convertible<U, R>::value, \
185  Vector<T, Abi> &> \
186  operator op_##=(Vector<T, Abi> &x, U &&y) \
187  { \
188  x = Detail::operator op_(R(x), R(std::forward<U>(y))); \
189  return x; \
190  }
191 
192 #define Vc_LOGICAL_OPERATOR(op_) \
193  template <class T, class Abi> \
194  Vc_ALWAYS_INLINE typename Vector<T, Abi>::Mask operator op_(Vector<T, Abi> x, \
195  Vector<T, Abi> y) \
196  { \
197  return !!x op_ !!y; \
198  } \
199  template <class T, class Abi, class U> \
200  Vc_ALWAYS_INLINE \
201  enable_if<std::is_convertible<Vector<T, Abi>, Vector<U, Abi>>::value && \
202  std::is_convertible<Vector<U, Abi>, Vector<T, Abi>>::value, \
203  typename Detail::ReturnType<Vector<T, Abi>, Vector<U, Abi>>::Mask> \
204  operator op_(Vector<T, Abi> x, Vector<U, Abi> y) \
205  { \
206  return !!x op_ !!y; \
207  } \
208  template <class T, class Abi, class U> \
209  Vc_ALWAYS_INLINE enable_if<std::is_same<bool, decltype(!std::declval<U>())>::value, \
210  typename Vector<T, Abi>::Mask> \
211  operator op_(Vector<T, Abi> x, U &&y) \
212  { \
213  using M = typename Vector<T, Abi>::Mask; \
214  return !!x op_ M(!!std::forward<U>(y)); \
215  } \
216  template <class T, class Abi, class U> \
217  Vc_ALWAYS_INLINE enable_if<std::is_same<bool, decltype(!std::declval<U>())>::value, \
218  typename Vector<T, Abi>::Mask> \
219  operator op_(U &&x, Vector<T, Abi> y) \
220  { \
221  using M = typename Vector<T, Abi>::Mask; \
222  return M(!!std::forward<U>(x)) op_ !!y; \
223  }
224 
225 #define Vc_COMPARE_OPERATOR(op_) \
226  template <class T, class Abi, class U, \
227  class R = Detail::ReturnType<Vector<T, Abi>, U>> \
228  Vc_ALWAYS_INLINE enable_if<std::is_convertible<Vector<T, Abi>, R>::value && \
229  std::is_convertible<U, R>::value, \
230  typename R::Mask> \
231  operator op_(Vector<T, Abi> x, U &&y) \
232  { \
233  return Detail::operator op_(R(x), R(std::forward<U>(y))); \
234  } \
235  template <class T, class Abi, class U, \
236  class R = Detail::ReturnType<Vector<T, Abi>, U>> \
237  Vc_ALWAYS_INLINE \
238  enable_if<!Traits::is_simd_vector_internal<remove_cvref_t<U>>::value && \
239  std::is_convertible<Vector<T, Abi>, R>::value && \
240  std::is_convertible<U, R>::value, \
241  typename R::Mask> \
242  operator op_(U &&x, Vector<T, Abi> y) \
243  { \
244  return Detail::operator op_(R(std::forward<U>(x)), R(y)); \
245  }
246 
247 Vc_ALL_LOGICAL (Vc_LOGICAL_OPERATOR);
248 Vc_ALL_BINARY (Vc_GENERIC_OPERATOR);
249 Vc_ALL_ARITHMETICS(Vc_GENERIC_OPERATOR);
250 Vc_ALL_COMPARES (Vc_COMPARE_OPERATOR);
251 
252 #undef Vc_LOGICAL_OPERATOR
253 #undef Vc_GENERIC_OPERATOR
254 #undef Vc_COMPARE_OPERATOR
255 #undef Vc_INVALID_OPERATOR
256 
257 } // namespace Vc
258 #endif // COMMON_OPERATORS_H_
Vc::Vector
Definition: fwddecl.h:53
Vc::uint
unsigned int uint
unsigned int shorthand
Definition: types.h:56