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 rotr(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>
test()28 constexpr bool test()
29 {
30 ASSERT_SAME_TYPE(decltype(std::rotr(T(), 0)), T);
31 ASSERT_NOEXCEPT(std::rotr(T(), 0));
32 T max = std::numeric_limits<T>::max();
33 T highbit = std::rotr(T(1), 1);
34
35 assert(std::rotr(T(max - 1), 0) == T(max - 1));
36 assert(std::rotr(T(max - 1), 1) == T(max - highbit));
37 assert(std::rotr(T(max - 1), 2) == T(max - (highbit >> 1)));
38 assert(std::rotr(T(max - 1), 3) == T(max - (highbit >> 2)));
39 assert(std::rotr(T(max - 1), 4) == T(max - (highbit >> 3)));
40 assert(std::rotr(T(max - 1), 5) == T(max - (highbit >> 4)));
41 assert(std::rotr(T(max - 1), 6) == T(max - (highbit >> 5)));
42 assert(std::rotr(T(max - 1), 7) == T(max - (highbit >> 6)));
43
44 assert(std::rotr(T(128), 0) == T(128));
45 assert(std::rotr(T(128), 1) == T(64));
46 assert(std::rotr(T(128), 2) == T(32));
47 assert(std::rotr(T(128), 3) == T(16));
48 assert(std::rotr(T(128), 4) == T(8));
49 assert(std::rotr(T(128), 5) == T(4));
50 assert(std::rotr(T(128), 6) == T(2));
51 assert(std::rotr(T(128), 7) == T(1));
52
53 #ifndef TEST_HAS_NO_INT128
54 if constexpr (std::is_same_v<T, __uint128_t>) {
55 T val = (T(1) << 63) | (T(1) << 64);
56 assert(std::rotr(val, 0) == val);
57 assert(std::rotr(val, 128) == val);
58 assert(std::rotr(val, 256) == val);
59 assert(std::rotr(val, 1) == val >> 1);
60 assert(std::rotr(val, 127) == val << 1);
61 assert(std::rotr(T(3), 1) == ((T(1) << 127) | T(1)));
62 }
63 #endif
64
65 return true;
66 }
67
main(int,char **)68 int main(int, char**)
69 {
70 {
71 auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};
72 using L = decltype(lambda);
73
74 static_assert(!std::is_invocable_v<L, signed char>);
75 static_assert(!std::is_invocable_v<L, short>);
76 static_assert(!std::is_invocable_v<L, int>);
77 static_assert(!std::is_invocable_v<L, long>);
78 static_assert(!std::is_invocable_v<L, long long>);
79 #ifndef TEST_HAS_NO_INT128
80 static_assert(!std::is_invocable_v<L, __int128_t>);
81 #endif
82
83 static_assert(!std::is_invocable_v<L, int8_t>);
84 static_assert(!std::is_invocable_v<L, int16_t>);
85 static_assert(!std::is_invocable_v<L, int32_t>);
86 static_assert(!std::is_invocable_v<L, int64_t>);
87 static_assert(!std::is_invocable_v<L, intmax_t>);
88 static_assert(!std::is_invocable_v<L, intptr_t>);
89 static_assert(!std::is_invocable_v<L, ptrdiff_t>);
90
91 static_assert(!std::is_invocable_v<L, bool>);
92 static_assert(!std::is_invocable_v<L, char>);
93 static_assert(!std::is_invocable_v<L, wchar_t>);
94 #ifndef TEST_HAS_NO_CHAR8_T
95 static_assert(!std::is_invocable_v<L, char8_t>);
96 #endif
97 static_assert(!std::is_invocable_v<L, char16_t>);
98 static_assert(!std::is_invocable_v<L, char32_t>);
99
100 static_assert(!std::is_invocable_v<L, A>);
101 static_assert(!std::is_invocable_v<L, A*>);
102 static_assert(!std::is_invocable_v<L, E1>);
103 static_assert(!std::is_invocable_v<L, E2>);
104 }
105
106 static_assert(test<unsigned char>());
107 static_assert(test<unsigned short>());
108 static_assert(test<unsigned int>());
109 static_assert(test<unsigned long>());
110 static_assert(test<unsigned long long>());
111 #ifndef TEST_HAS_NO_INT128
112 static_assert(test<__uint128_t>());
113 #endif
114
115 static_assert(test<uint8_t>());
116 static_assert(test<uint16_t>());
117 static_assert(test<uint32_t>());
118 static_assert(test<uint64_t>());
119 static_assert(test<uintmax_t>());
120 static_assert(test<uintptr_t>());
121 static_assert(test<size_t>());
122
123 test<unsigned char>();
124 test<unsigned short>();
125 test<unsigned int>();
126 test<unsigned long>();
127 test<unsigned long long>();
128 #ifndef TEST_HAS_NO_INT128
129 test<__uint128_t>();
130 #endif
131
132 test<uint8_t>();
133 test<uint16_t>();
134 test<uint32_t>();
135 test<uint64_t>();
136 test<uintmax_t>();
137 test<uintptr_t>();
138 test<size_t>();
139
140 return 0;
141 }
142