1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
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 <cstddef>
19#include <cstdint>
20#include <limits>
21#include <type_traits>
22
23#include "test_macros.h"
24
25struct A {};
26enum E1 : unsigned char { rEd };
27enum class E2 : unsigned char { red };
28
29template <class T>
30constexpr bool test()
31{
32 ASSERT_SAME_TYPE(decltype(std::rotl(T(), 0)), T);
33 ASSERT_NOEXCEPT(std::rotl(T(), 0));
34 T max = std::numeric_limits<T>::max();
35 T highbit = std::rotr(T(1), 1);
36
37 assert(std::rotl(T(max - 1), 0) == T(max - 1));
38 assert(std::rotl(T(max - 1), 1) == T(max - 2));
39 assert(std::rotl(T(max - 1), 2) == T(max - 4));
40 assert(std::rotl(T(max - 1), 3) == T(max - 8));
41 assert(std::rotl(T(max - 1), 4) == T(max - 16));
42 assert(std::rotl(T(max - 1), 5) == T(max - 32));
43 assert(std::rotl(T(max - 1), 6) == T(max - 64));
44 assert(std::rotl(T(max - 1), 7) == T(max - 128));
45 assert(std::rotl(T(max - 1), std::numeric_limits<int>::max()) ==
46 std::rotl(T(max - 1), std::numeric_limits<int>::max() % std::numeric_limits<T>::digits));
47
48 assert(std::rotl(T(max - 1), -1) == T(max - highbit));
49 assert(std::rotl(T(max - 1), -2) == T(max - (highbit >> 1)));
50 assert(std::rotl(T(max - 1), -3) == T(max - (highbit >> 2)));
51 assert(std::rotl(T(max - 1), -4) == T(max - (highbit >> 3)));
52 assert(std::rotl(T(max - 1), -5) == T(max - (highbit >> 4)));
53 assert(std::rotl(T(max - 1), -6) == T(max - (highbit >> 5)));
54 assert(std::rotl(T(max - 1), -7) == T(max - (highbit >> 6)));
55 assert(std::rotl(T(max - 1), std::numeric_limits<int>::min()) ==
56 std::rotl(T(max - 1), std::numeric_limits<int>::min() % std::numeric_limits<T>::digits));
57
58 assert(std::rotl(T(1), 0) == T(1));
59 assert(std::rotl(T(1), 1) == T(2));
60 assert(std::rotl(T(1), 2) == T(4));
61 assert(std::rotl(T(1), 3) == T(8));
62 assert(std::rotl(T(1), 4) == T(16));
63 assert(std::rotl(T(1), 5) == T(32));
64 assert(std::rotl(T(1), 6) == T(64));
65 assert(std::rotl(T(1), 7) == T(128));
66
67 assert(std::rotl(T(128), -1) == T(64));
68 assert(std::rotl(T(128), -2) == T(32));
69 assert(std::rotl(T(128), -3) == T(16));
70 assert(std::rotl(T(128), -4) == T(8));
71 assert(std::rotl(T(128), -5) == T(4));
72 assert(std::rotl(T(128), -6) == T(2));
73 assert(std::rotl(T(128), -7) == T(1));
74
75#ifndef TEST_HAS_NO_INT128
76 if constexpr (std::is_same_v<T, __uint128_t>) {
77 T val = (T(1) << 63) | (T(1) << 64);
78 assert(std::rotl(val, 0) == val);
79 assert(std::rotl(val, 128) == val);
80 assert(std::rotl(val, 256) == val);
81 assert(std::rotl(val, 1) == val << 1);
82 assert(std::rotl(val, 127) == val >> 1);
83 assert(std::rotl(T(3), 127) == ((T(1) << 127) | T(1)));
84
85 assert(std::rotl(val, -128) == val);
86 assert(std::rotl(val, -256) == val);
87 assert(std::rotl(val, -1) == val >> 1);
88 assert(std::rotl(val, -127) == val << 1);
89 assert(std::rotl(T(3), -1) == ((T(1) << 127) | T(1)));
90 }
91#endif
92
93 return true;
94}
95
96int main(int, char**)
97{
98 {
99 auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};
100 using L = decltype(lambda);
101
102 static_assert(!std::is_invocable_v<L, signed char>);
103 static_assert(!std::is_invocable_v<L, short>);
104 static_assert(!std::is_invocable_v<L, int>);
105 static_assert(!std::is_invocable_v<L, long>);
106 static_assert(!std::is_invocable_v<L, long long>);
107#ifndef TEST_HAS_NO_INT128
108 static_assert(!std::is_invocable_v<L, __int128_t>);
109#endif
110
111 static_assert(!std::is_invocable_v<L, std::int8_t>);
112 static_assert(!std::is_invocable_v<L, std::int16_t>);
113 static_assert(!std::is_invocable_v<L, std::int32_t>);
114 static_assert(!std::is_invocable_v<L, std::int64_t>);
115 static_assert(!std::is_invocable_v<L, std::intmax_t>);
116 static_assert(!std::is_invocable_v<L, std::intptr_t>);
117 static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
118
119 static_assert(!std::is_invocable_v<L, bool>);
120 static_assert(!std::is_invocable_v<L, char>);
121 static_assert(!std::is_invocable_v<L, wchar_t>);
122#ifndef TEST_HAS_NO_CHAR8_T
123 static_assert(!std::is_invocable_v<L, char8_t>);
124#endif
125 static_assert(!std::is_invocable_v<L, char16_t>);
126 static_assert(!std::is_invocable_v<L, char32_t>);
127
128 static_assert(!std::is_invocable_v<L, A>);
129 static_assert(!std::is_invocable_v<L, A*>);
130 static_assert(!std::is_invocable_v<L, E1>);
131 static_assert(!std::is_invocable_v<L, E2>);
132 }
133
134 static_assert(test<unsigned char>());
135 static_assert(test<unsigned short>());
136 static_assert(test<unsigned int>());
137 static_assert(test<unsigned long>());
138 static_assert(test<unsigned long long>());
139#ifndef TEST_HAS_NO_INT128
140 static_assert(test<__uint128_t>());
141#endif
142
143 static_assert(test<std::uint8_t>());
144 static_assert(test<std::uint16_t>());
145 static_assert(test<std::uint32_t>());
146 static_assert(test<std::uint64_t>());
147 static_assert(test<std::uintmax_t>());
148 static_assert(test<std::uintptr_t>());
149 static_assert(test<std::size_t>());
150
151 test<unsigned char>();
152 test<unsigned short>();
153 test<unsigned int>();
154 test<unsigned long>();
155 test<unsigned long long>();
156#ifndef TEST_HAS_NO_INT128
157 test<__uint128_t>();
158#endif
159
160 test<std::uint8_t>();
161 test<std::uint16_t>();
162 test<std::uint32_t>();
163 test<std::uint64_t>();
164 test<std::uintmax_t>();
165 test<std::uintptr_t>();
166 test<std::size_t>();
167
168 return 0;
169}
170

source code of libcxx/test/std/numerics/bit/bitops.rot/rotl.pass.cpp