1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 
11 // template <class T>
12 //   constexpr int rotl(T x, unsigned int s) noexcept;
13 
14 // Remarks: This function shall not participate in overload resolution unless
15 //  T is an unsigned integer type
16 
17 #include <bit>
18 #include <cstdint>
19 #include <type_traits>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 
24 class A{};
25 enum       E1 : unsigned char { rEd };
26 enum class E2 : unsigned char { red };
27 
28 template <typename T>
29 constexpr bool constexpr_test()
30 {
31     const T max = std::numeric_limits<T>::max();
32     return std::rotl(T(1), 0) == T( 1)
33        &&  std::rotl(T(1), 1) == T( 2)
34        &&  std::rotl(T(1), 2) == T( 4)
35        &&  std::rotl(T(1), 3) == T( 8)
36        &&  std::rotl(T(1), 4) == T( 16)
37        &&  std::rotl(T(1), 5) == T( 32)
38        &&  std::rotl(T(1), 6) == T( 64)
39        &&  std::rotl(T(1), 7) == T(128)
40        &&  std::rotl(max, 0)  == max
41        &&  std::rotl(max, 1)  == max
42        &&  std::rotl(max, 2)  == max
43        &&  std::rotl(max, 3)  == max
44        &&  std::rotl(max, 4)  == max
45        &&  std::rotl(max, 5)  == max
46        &&  std::rotl(max, 6)  == max
47        &&  std::rotl(max, 7)  == max
48       ;
49 }
50 
51 
52 template <typename T>
53 void runtime_test()
54 {
55     ASSERT_SAME_TYPE(T, decltype(std::rotl(T(0), 0)));
56     ASSERT_NOEXCEPT(             std::rotl(T(0), 0));
57     const T val = std::numeric_limits<T>::max() - 1;
58 
59     assert( std::rotl(val, 0) == val);
60     assert( std::rotl(val, 1) == T((val << 1) +   1));
61     assert( std::rotl(val, 2) == T((val << 2) +   3));
62     assert( std::rotl(val, 3) == T((val << 3) +   7));
63     assert( std::rotl(val, 4) == T((val << 4) +  15));
64     assert( std::rotl(val, 5) == T((val << 5) +  31));
65     assert( std::rotl(val, 6) == T((val << 6) +  63));
66     assert( std::rotl(val, 7) == T((val << 7) + 127));
67 }
68 
69 int main(int, char**)
70 {
71 
72     {
73     auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};
74     using L = decltype(lambda);
75 
76     static_assert( std::is_invocable_v<L, unsigned char>, "");
77     static_assert( std::is_invocable_v<L, unsigned int>, "");
78     static_assert( std::is_invocable_v<L, unsigned long>, "");
79     static_assert( std::is_invocable_v<L, unsigned long long>, "");
80 
81     static_assert( std::is_invocable_v<L, uint8_t>, "");
82     static_assert( std::is_invocable_v<L, uint16_t>, "");
83     static_assert( std::is_invocable_v<L, uint32_t>, "");
84     static_assert( std::is_invocable_v<L, uint64_t>, "");
85     static_assert( std::is_invocable_v<L, size_t>, "");
86 
87     static_assert( std::is_invocable_v<L, uintmax_t>, "");
88     static_assert( std::is_invocable_v<L, uintptr_t>, "");
89 
90 
91     static_assert(!std::is_invocable_v<L, int>, "");
92     static_assert(!std::is_invocable_v<L, signed int>, "");
93     static_assert(!std::is_invocable_v<L, long>, "");
94     static_assert(!std::is_invocable_v<L, long long>, "");
95 
96     static_assert(!std::is_invocable_v<L, int8_t>, "");
97     static_assert(!std::is_invocable_v<L, int16_t>, "");
98     static_assert(!std::is_invocable_v<L, int32_t>, "");
99     static_assert(!std::is_invocable_v<L, int64_t>, "");
100     static_assert(!std::is_invocable_v<L, ptrdiff_t>, "");
101 
102     static_assert(!std::is_invocable_v<L, bool>, "");
103     static_assert(!std::is_invocable_v<L, signed char>, "");
104     static_assert(!std::is_invocable_v<L, char16_t>, "");
105     static_assert(!std::is_invocable_v<L, char32_t>, "");
106 
107 #ifndef _LIBCPP_HAS_NO_INT128
108     static_assert( std::is_invocable_v<L, __uint128_t>, "");
109     static_assert(!std::is_invocable_v<L,  __int128_t>, "");
110 #endif
111 
112     static_assert(!std::is_invocable_v<L, A>, "");
113     static_assert(!std::is_invocable_v<L, E1>, "");
114     static_assert(!std::is_invocable_v<L, E2>, "");
115     }
116 
117     static_assert(constexpr_test<unsigned char>(),      "");
118     static_assert(constexpr_test<unsigned short>(),     "");
119     static_assert(constexpr_test<unsigned>(),           "");
120     static_assert(constexpr_test<unsigned long>(),      "");
121     static_assert(constexpr_test<unsigned long long>(), "");
122 
123     static_assert(constexpr_test<uint8_t>(),   "");
124     static_assert(constexpr_test<uint16_t>(),  "");
125     static_assert(constexpr_test<uint32_t>(),  "");
126     static_assert(constexpr_test<uint64_t>(),  "");
127     static_assert(constexpr_test<size_t>(),    "");
128     static_assert(constexpr_test<uintmax_t>(), "");
129     static_assert(constexpr_test<uintptr_t>(), "");
130 
131 #ifndef _LIBCPP_HAS_NO_INT128
132     static_assert(constexpr_test<__uint128_t>(),        "");
133 #endif
134 
135 
136     runtime_test<unsigned char>();
137     runtime_test<unsigned short>();
138     runtime_test<unsigned>();
139     runtime_test<unsigned long>();
140     runtime_test<unsigned long long>();
141 
142     runtime_test<uint8_t>();
143     runtime_test<uint16_t>();
144     runtime_test<uint32_t>();
145     runtime_test<uint64_t>();
146     runtime_test<size_t>();
147     runtime_test<uintmax_t>();
148     runtime_test<uintptr_t>();
149 
150 #ifndef _LIBCPP_HAS_NO_INT128
151     runtime_test<__uint128_t>();
152 
153     {
154     __uint128_t val = 168; // 0xA8 (aka 10101000)
155 
156     assert( std::rotl(val, 128) == 168);
157     val <<= 32;
158     assert( std::rotl(val,  96) == 168);
159     val <<= 2;
160     assert( std::rotl(val,  95) == 336);
161     val <<= 3;
162     assert( std::rotl(val,  90) ==  84);
163     assert( std::rotl(val, 218) ==  84);
164     }
165 #endif
166 
167     return 0;
168 }
169