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 // Constraints: T is an unsigned integer type
15 
16 #include <bit>
17 #include <cassert>
18 #include <cstdint>
19 #include <type_traits>
20 
21 #include "test_macros.h"
22 
23 struct A {};
24 enum       E1 : unsigned char { rEd };
25 enum class E2 : unsigned char { red };
26 
27 template <class T>
28 constexpr bool test()
29 {
30     ASSERT_SAME_TYPE(decltype(std::rotl(T(), 0)), T);
31     ASSERT_NOEXCEPT(std::rotl(T(), 0));
32     T max = std::numeric_limits<T>::max();
33 
34     assert(std::rotl(T(max - 1), 0) == T(max - 1));
35     assert(std::rotl(T(max - 1), 1) == T(max - 2));
36     assert(std::rotl(T(max - 1), 2) == T(max - 4));
37     assert(std::rotl(T(max - 1), 3) == T(max - 8));
38     assert(std::rotl(T(max - 1), 4) == T(max - 16));
39     assert(std::rotl(T(max - 1), 5) == T(max - 32));
40     assert(std::rotl(T(max - 1), 6) == T(max - 64));
41     assert(std::rotl(T(max - 1), 7) == T(max - 128));
42 
43     assert(std::rotl(T(1), 0) == T(1));
44     assert(std::rotl(T(1), 1) == T(2));
45     assert(std::rotl(T(1), 2) == T(4));
46     assert(std::rotl(T(1), 3) == T(8));
47     assert(std::rotl(T(1), 4) == T(16));
48     assert(std::rotl(T(1), 5) == T(32));
49     assert(std::rotl(T(1), 6) == T(64));
50     assert(std::rotl(T(1), 7) == T(128));
51 
52 #ifndef _LIBCPP_HAS_NO_INT128
53     if constexpr (std::is_same_v<T, __uint128_t>) {
54         T val = (T(1) << 63) | (T(1) << 64);
55         assert(std::rotl(val, 0) == val);
56         assert(std::rotl(val, 128) == val);
57         assert(std::rotl(val, 256) == val);
58         assert(std::rotl(val, 1) == val << 1);
59         assert(std::rotl(val, 127) == val >> 1);
60         assert(std::rotl(T(3), 127) == ((T(1) << 127) | T(1)));
61     }
62 #endif
63 
64     return true;
65 }
66 
67 int main(int, char**)
68 {
69     {
70     auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};
71     using L = decltype(lambda);
72 
73     static_assert(!std::is_invocable_v<L, signed char>);
74     static_assert(!std::is_invocable_v<L, short>);
75     static_assert(!std::is_invocable_v<L, int>);
76     static_assert(!std::is_invocable_v<L, long>);
77     static_assert(!std::is_invocable_v<L, long long>);
78 #ifndef _LIBCPP_HAS_NO_INT128
79     static_assert(!std::is_invocable_v<L, __int128_t>);
80 #endif
81 
82     static_assert(!std::is_invocable_v<L, int8_t>);
83     static_assert(!std::is_invocable_v<L, int16_t>);
84     static_assert(!std::is_invocable_v<L, int32_t>);
85     static_assert(!std::is_invocable_v<L, int64_t>);
86     static_assert(!std::is_invocable_v<L, intmax_t>);
87     static_assert(!std::is_invocable_v<L, intptr_t>);
88     static_assert(!std::is_invocable_v<L, ptrdiff_t>);
89 
90     static_assert(!std::is_invocable_v<L, bool>);
91     static_assert(!std::is_invocable_v<L, char>);
92     static_assert(!std::is_invocable_v<L, wchar_t>);
93 #ifndef _LIBCPP_HAS_NO_CHAR8_T
94     static_assert(!std::is_invocable_v<L, char8_t>);
95 #endif
96     static_assert(!std::is_invocable_v<L, char16_t>);
97     static_assert(!std::is_invocable_v<L, char32_t>);
98 
99     static_assert(!std::is_invocable_v<L, A>);
100     static_assert(!std::is_invocable_v<L, A*>);
101     static_assert(!std::is_invocable_v<L, E1>);
102     static_assert(!std::is_invocable_v<L, E2>);
103     }
104 
105     static_assert(test<unsigned char>());
106     static_assert(test<unsigned short>());
107     static_assert(test<unsigned int>());
108     static_assert(test<unsigned long>());
109     static_assert(test<unsigned long long>());
110 #ifndef _LIBCPP_HAS_NO_INT128
111     static_assert(test<__uint128_t>());
112 #endif
113 
114     static_assert(test<uint8_t>());
115     static_assert(test<uint16_t>());
116     static_assert(test<uint32_t>());
117     static_assert(test<uint64_t>());
118     static_assert(test<uintmax_t>());
119     static_assert(test<uintptr_t>());
120     static_assert(test<size_t>());
121 
122     test<unsigned char>();
123     test<unsigned short>();
124     test<unsigned int>();
125     test<unsigned long>();
126     test<unsigned long long>();
127 #ifndef _LIBCPP_HAS_NO_INT128
128     test<__uint128_t>();
129 #endif
130 
131     test<uint8_t>();
132     test<uint16_t>();
133     test<uint32_t>();
134     test<uint64_t>();
135     test<uintmax_t>();
136     test<uintptr_t>();
137     test<size_t>();
138 
139     return 0;
140 }
141