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, c++20
10
11 #include <bit>
12 #include <cassert>
13 #include <cstdint>
14 #include <utility>
15
16 #include "test_macros.h"
17
18 template <class T>
19 concept has_byteswap = requires(T t) {
20 std::byteswap(t);
21 };
22
23 static_assert(!has_byteswap<void*>);
24 static_assert(!has_byteswap<float>);
25 static_assert(!has_byteswap<char[2]>);
26 static_assert(!has_byteswap<std::byte>);
27
28 template <class T>
test_num(T in,T expected)29 constexpr void test_num(T in, T expected) {
30 assert(std::byteswap(in) == expected);
31 ASSERT_SAME_TYPE(decltype(std::byteswap(in)), decltype(in));
32 ASSERT_NOEXCEPT(std::byteswap(in));
33 }
34
35 template <class T>
get_test_data()36 constexpr std::pair<T, T> get_test_data() {
37 switch (sizeof(T)) {
38 case 2:
39 return {static_cast<T>(0x1234), static_cast<T>(0x3412)};
40 case 4:
41 return {static_cast<T>(0x60AF8503), static_cast<T>(0x0385AF60)};
42 case 8:
43 return {static_cast<T>(0xABCDFE9477936406), static_cast<T>(0x0664937794FECDAB)};
44 default:
45 assert(false);
46 return {}; // for MSVC, whose `assert` is tragically not [[noreturn]]
47 }
48 }
49
50 template <class T>
test_implementation_defined_size()51 constexpr void test_implementation_defined_size() {
52 const auto [in, expected] = get_test_data<T>();
53 test_num<T>(in, expected);
54 }
55
test()56 constexpr bool test() {
57 test_num<std::uint8_t>(0xAB, 0xAB);
58 test_num<std::uint16_t>(0xCDEF, 0xEFCD);
59 test_num<std::uint32_t>(0x01234567, 0x67452301);
60 test_num<std::uint64_t>(0x0123456789ABCDEF, 0xEFCDAB8967452301);
61
62 test_num<std::int8_t>(static_cast<std::int8_t>(0xAB), static_cast<std::int8_t>(0xAB));
63 test_num<std::int16_t>(static_cast<std::int16_t>(0xCDEF), static_cast<std::int16_t>(0xEFCD));
64 test_num<std::int32_t>(0x01234567, 0x67452301);
65 test_num<std::int64_t>(0x0123456789ABCDEF, 0xEFCDAB8967452301);
66
67 #ifndef TEST_HAS_NO_INT128
68 const auto in = static_cast<__uint128_t>(0x0123456789ABCDEF) << 64 | 0x13579BDF02468ACE;
69 const auto expected = static_cast<__uint128_t>(0xCE8A4602DF9B5713) << 64 | 0xEFCDAB8967452301;
70 test_num<__uint128_t>(in, expected);
71 test_num<__int128_t>(in, expected);
72 #endif
73
74 test_num<bool>(true, true);
75 test_num<bool>(false, false);
76 test_num<char>(static_cast<char>(0xCD), static_cast<char>(0xCD));
77 test_num<unsigned char>(0xEF, 0xEF);
78 test_num<signed char>(0x45, 0x45);
79 test_num<char8_t>(0xAB, 0xAB);
80 test_num<char16_t>(0xABCD, 0xCDAB);
81 test_num<char32_t>(0xABCDEF01, 0x01EFCDAB);
82 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
83 test_implementation_defined_size<wchar_t>();
84 #endif
85
86 test_implementation_defined_size<short>();
87 test_implementation_defined_size<unsigned short>();
88 test_implementation_defined_size<int>();
89 test_implementation_defined_size<unsigned int>();
90 test_implementation_defined_size<long>();
91 test_implementation_defined_size<unsigned long>();
92 test_implementation_defined_size<long long>();
93 test_implementation_defined_size<unsigned long long>();
94 return true;
95 }
96
main(int,char **)97 int main(int, char**) {
98 test();
99 static_assert(test());
100
101 return 0;
102 }
103