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 T bit_ceil(T x) noexcept;
13
14 // Constraints: T is an unsigned integer type
15 // Returns: The minimal value y such that has_single_bit(y) is true and y >= x;
16 // if y is not representable as a value of type T, the result is an unspecified value.
17
18 #include <bit>
19 #include <cassert>
20 #include <cstdint>
21 #include <type_traits>
22
23 #include "test_macros.h"
24
25 struct A {};
26 enum E1 : unsigned char { rEd };
27 enum class E2 : unsigned char { red };
28
29 template <class T>
test()30 constexpr bool test()
31 {
32 ASSERT_SAME_TYPE(decltype(std::bit_ceil(T())), T);
33 LIBCPP_ASSERT_NOEXCEPT(std::bit_ceil(T()));
34
35 assert(std::bit_ceil(T(0)) == T(1));
36 assert(std::bit_ceil(T(1)) == T(1));
37 assert(std::bit_ceil(T(2)) == T(2));
38 assert(std::bit_ceil(T(3)) == T(4));
39 assert(std::bit_ceil(T(4)) == T(4));
40 assert(std::bit_ceil(T(5)) == T(8));
41 assert(std::bit_ceil(T(6)) == T(8));
42 assert(std::bit_ceil(T(7)) == T(8));
43 assert(std::bit_ceil(T(8)) == T(8));
44 assert(std::bit_ceil(T(9)) == T(16));
45 assert(std::bit_ceil(T(60)) == T(64));
46 assert(std::bit_ceil(T(61)) == T(64));
47 assert(std::bit_ceil(T(62)) == T(64));
48 assert(std::bit_ceil(T(63)) == T(64));
49 assert(std::bit_ceil(T(64)) == T(64));
50 assert(std::bit_ceil(T(65)) == T(128));
51 assert(std::bit_ceil(T(66)) == T(128));
52 assert(std::bit_ceil(T(67)) == T(128));
53 assert(std::bit_ceil(T(68)) == T(128));
54 assert(std::bit_ceil(T(69)) == T(128));
55
56 #ifndef TEST_HAS_NO_INT128
57 if constexpr (std::is_same_v<T, __uint128_t>) {
58 T val = 168;
59 T ceil = 256;
60
61 assert(std::bit_ceil(val) == ceil);
62 assert(std::bit_ceil(val << 32) == (ceil << 32));
63 assert(std::bit_ceil((val << 64) | 0x1) == (ceil << 64));
64 assert(std::bit_ceil((val << 72) | 0x1) == (ceil << 72));
65 assert(std::bit_ceil((val << 100) | 0x1) == (ceil << 100));
66 }
67 #endif
68
69 return true;
70 }
71
main(int,char **)72 int main(int, char**)
73 {
74 {
75 auto lambda = [](auto x) -> decltype(std::bit_ceil(x)) {};
76 using L = decltype(lambda);
77
78 static_assert(!std::is_invocable_v<L, signed char>);
79 static_assert(!std::is_invocable_v<L, short>);
80 static_assert(!std::is_invocable_v<L, int>);
81 static_assert(!std::is_invocable_v<L, long>);
82 static_assert(!std::is_invocable_v<L, long long>);
83 #ifndef TEST_HAS_NO_INT128
84 static_assert(!std::is_invocable_v<L, __int128_t>);
85 #endif
86
87 static_assert(!std::is_invocable_v<L, int8_t>);
88 static_assert(!std::is_invocable_v<L, int16_t>);
89 static_assert(!std::is_invocable_v<L, int32_t>);
90 static_assert(!std::is_invocable_v<L, int64_t>);
91 static_assert(!std::is_invocable_v<L, intmax_t>);
92 static_assert(!std::is_invocable_v<L, intptr_t>);
93 static_assert(!std::is_invocable_v<L, ptrdiff_t>);
94
95 static_assert(!std::is_invocable_v<L, bool>);
96 static_assert(!std::is_invocable_v<L, char>);
97 static_assert(!std::is_invocable_v<L, wchar_t>);
98 #ifndef TEST_HAS_NO_CHAR8_T
99 static_assert(!std::is_invocable_v<L, char8_t>);
100 #endif
101 static_assert(!std::is_invocable_v<L, char16_t>);
102 static_assert(!std::is_invocable_v<L, char32_t>);
103
104 static_assert(!std::is_invocable_v<L, A>);
105 static_assert(!std::is_invocable_v<L, A*>);
106 static_assert(!std::is_invocable_v<L, E1>);
107 static_assert(!std::is_invocable_v<L, E2>);
108 }
109
110 static_assert(test<unsigned char>());
111 static_assert(test<unsigned short>());
112 static_assert(test<unsigned int>());
113 static_assert(test<unsigned long>());
114 static_assert(test<unsigned long long>());
115 #ifndef TEST_HAS_NO_INT128
116 static_assert(test<__uint128_t>());
117 #endif
118 static_assert(test<uint8_t>());
119 static_assert(test<uint16_t>());
120 static_assert(test<uint32_t>());
121 static_assert(test<uint64_t>());
122 static_assert(test<uintmax_t>());
123 static_assert(test<uintptr_t>());
124 static_assert(test<size_t>());
125
126 test<unsigned char>();
127 test<unsigned short>();
128 test<unsigned int>();
129 test<unsigned long>();
130 test<unsigned long long>();
131 #ifndef TEST_HAS_NO_INT128
132 test<__uint128_t>();
133 #endif
134 test<uint8_t>();
135 test<uint16_t>();
136 test<uint32_t>();
137 test<uint64_t>();
138 test<uintmax_t>();
139 test<uintptr_t>();
140 test<size_t>();
141
142 return 0;
143 }
144