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1 // Copyright (C) 2021-2024 Free Software Foundation, Inc.
3 // This file is part of the GNU ISO C++ Library. This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
18 // { dg-do compile { target c++23 } }
19 // { dg-add-options no_pch }
23 #ifndef __cpp_lib_byteswap
24 # error "Feature-test macro for byteswap missing in <bit>"
25 #elif __cpp_lib_byteswap != 202110L
26 # error "Feature-test macro for byteswap has wrong value in <bit>"
31 #include <testsuite_hooks.h>
36 static_assert( std::byteswap
<int8_t>(0x12) == 0x12 );
37 static_assert( std::byteswap
<int16_t>(0x1234) == 0x3412 );
38 static_assert( std::byteswap
<int32_t>(0x12345678) == 0x78563412 );
39 static_assert( std::byteswap
<int64_t>(0x123456789abcdef0)
40 == static_cast<int64_t>(0xf0debc9a78563412) );
41 static_assert( std::byteswap
<uint8_t>(0x21) == 0x21 );
42 static_assert( std::byteswap
<uint16_t>(0x4321) == 0x2143 );
43 static_assert( std::byteswap
<uint32_t>(0x87654321) == 0x21436587 );
44 static_assert( std::byteswap
<uint64_t>(0xfedcba9876543210)
45 == static_cast<uint64_t>(0x1032547698badcfe) );
46 #if !defined(__STRICT_ANSI__) && defined __SIZEOF_INT128__
47 constexpr __int128_t c1
= (static_cast<__int128_t
>(0x0102030405060708) << 64
48 | 0x090a0b0c0d0e0f10);
49 constexpr __int128_t c2
= (static_cast<__int128_t
>(0x100f0e0d0c0b0a09) << 64
50 | 0x0807060504030201);
51 constexpr __int128_t c3
= (static_cast<__int128_t
>(0xf1e2d3c4b5a69788) << 64
52 | 0x796a5b4c3d2e1f10);
53 constexpr __int128_t c4
= (static_cast<__int128_t
>(0x101f2e3d4c5b6a79) << 64
54 | 0x8897a6b5c4d3e2f1);
55 static_assert( std::byteswap(c1
) == c2
);
56 static_assert( std::byteswap(static_cast<__uint128_t
>(c1
))
57 == static_cast<__uint128_t
>(c2
) );
58 static_assert( std::byteswap(c3
) == c4
);
60 static_assert( std::byteswap
<const uint32_t>(0xdeadbeef) == 0xefbeadde );
61 static_assert( std::byteswap
<volatile uint32_t>(0xdeadbeef) == 0xefbeadde );
62 static_assert( std::byteswap
<int32_t>(0xdeadbeef)
63 == static_cast<int32_t>(0xefbeadde) );
69 volatile int8_t a
= 0x12;
70 volatile int16_t b
= 0x1234;
71 volatile int32_t c
= 0x12345678;
72 volatile int64_t d
= 0x123456789abcdef0;
73 volatile uint8_t e
= 0x21;
74 volatile uint16_t f
= 0x4321;
75 volatile uint32_t g
= 0x87654321;
76 volatile uint64_t h
= 0xfedcba9876543210;
77 VERIFY ( std::byteswap
<int8_t>(a
) == 0x12 );
78 VERIFY ( std::byteswap
<int16_t>(b
) == 0x3412 );
79 VERIFY ( std::byteswap(c
) == 0x78563412 );
80 VERIFY ( std::byteswap(d
) == 0xf0debc9a78563412 );
81 VERIFY ( std::byteswap
<uint8_t>(e
) == 0x21 );
82 VERIFY ( std::byteswap
<uint16_t>(f
) == 0x2143 );
83 VERIFY ( std::byteswap(g
) == 0x21436587 );
84 VERIFY ( std::byteswap(h
) == 0x1032547698badcfe );
85 VERIFY ( std::byteswap(std::byteswap
<int8_t>(a
)) == a
);
86 VERIFY ( std::byteswap(std::byteswap
<int16_t>(b
)) == b
);
87 VERIFY ( std::byteswap(std::byteswap(c
)) == c
);
88 VERIFY ( std::byteswap(std::byteswap(d
)) == d
);
89 VERIFY ( std::byteswap(std::byteswap
<uint8_t>(e
)) == e
);
90 VERIFY ( std::byteswap(std::byteswap
<uint16_t>(f
)) == f
);
91 VERIFY ( std::byteswap(std::byteswap(g
)) == g
);
92 VERIFY ( std::byteswap(std::byteswap(h
)) == h
);
93 #if !defined(__STRICT_ANSI__) && defined __SIZEOF_INT128__
94 volatile __int128_t c1
= (static_cast<__int128_t
>(0x0102030405060708) << 64
95 | 0x090a0b0c0d0e0f10);
96 volatile __int128_t c2
= (static_cast<__int128_t
>(0x100f0e0d0c0b0a09) << 64
97 | 0x0807060504030201);
98 VERIFY ( std::byteswap(c1
) == c2
);
99 VERIFY ( std::byteswap
<__uint128_t
>(c1
) == static_cast<__uint128_t
>(c2
) );
100 VERIFY ( std::byteswap(std::byteswap(c1
)) == c1
);
101 VERIFY ( std::byteswap(std::byteswap
<__uint128_t
>(c2
))
102 == static_cast<__uint128_t
>(c2
) );
104 VERIFY ( std::byteswap
<const uint32_t>(0xdeadbeef) == 0xefbeadde );
105 VERIFY ( std::byteswap
<volatile uint32_t>(0xdeadbeef) == 0xefbeadde );