Mercurial > hg > CbC > CbC_gcc

comparison libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/bit_floor.cc @ 152:2b5abeee2509

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
update gcc11
author anatofuz
date Mon, 25 May 2020 07:50:57 +0900
parents
children
comparison
equal deleted inserted replaced
145:1830386684a0 152:2b5abeee2509
1 // Copyright (C) 2018-2020 Free Software Foundation, Inc.
2 //
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)
7 // any later version.
8
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.
13
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/>.
17
18 // { dg-options "-std=gnu++2a" }
19 // { dg-do compile { target c++2a } }
20
21 #include <bit>
22 #include <limits>
23
24 template<typename UInt>
25 constexpr auto
26 test(UInt x)
27 -> decltype(std::bit_floor(x))
28 {
29 static_assert( noexcept(std::bit_floor(x)) );
30
31 static_assert( std::bit_floor(UInt(0)) == 0 );
32 static_assert( std::bit_floor(UInt(1)) == 1 );
33 static_assert( std::bit_floor(UInt(2)) == 2 );
34 static_assert( std::bit_floor(UInt(3)) == 2 );
35 static_assert( std::bit_floor(UInt(4)) == 4 );
36 static_assert( std::bit_floor(UInt(0x11)) == 0x10 );
37 static_assert( std::bit_floor(UInt(0x20)) == 0x20 );
38
39 if constexpr (std::numeric_limits<UInt>::digits > 8)
40 {
41 static_assert( std::bit_floor(UInt(0x201)) == 0x200 );
42 static_assert( std::bit_floor(UInt(0x8ff)) == 0x800 );
43 static_assert( std::bit_floor(UInt(0x1000)) == 0x1000 );
44 }
45
46 if constexpr (std::numeric_limits<UInt>::digits > 32)
47 {
48 static_assert( std::bit_floor(UInt(0xabcdef)) == 0x800000 );
49 static_assert( std::bit_floor(UInt(0x1000000)) == 0x1000000 );
50 static_assert( std::bit_floor(UInt(0x1000001)) == 0x1000000 );
51 }
52
53 if constexpr (std::numeric_limits<UInt>::digits > 64)
54 {
55 static_assert( std::bit_floor(UInt(1) << 64) == (UInt(1) << 64) );
56 static_assert( std::bit_floor(UInt(3) << 64) == (UInt(2) << 64) );
57 }
58
59 return true;
60 }
61
62 static_assert( test( (unsigned char)0 ) );
63 static_assert( test( (unsigned short)0 ) );
64 static_assert( test( (unsigned int)0 ) );
65 static_assert( test( (unsigned long)0 ) );
66 static_assert( test( (unsigned long long)0 ) );
67
68 // std::bit_floor(T) shall not participate in overload resolution
69 // unless T is an unsigned integer type.
70 struct X { constexpr bool did_not_match() { return true; } };
71 constexpr X test(...) { return X{}; }
72 static_assert( test( (bool)0 ).did_not_match() );
73 static_assert( test( (char)0 ).did_not_match() );
74 static_assert( test( (int)0 ).did_not_match() );
75 static_assert( test( (char16_t)0 ).did_not_match() );
76 static_assert( test( (float)0 ).did_not_match() );
77 static_assert( test( (void*)0 ).did_not_match() );
78 static_assert( test( X{} ).did_not_match() );
79 enum E : unsigned { e };
80 static_assert( test( e ).did_not_match() );
81
82 #if !defined(__STRICT_ANSI__) && defined _GLIBCXX_USE_INT128
83 static_assert( test( (unsigned __int128)0 ) );
84 static_assert( test( (__int128)0 ).did_not_match() );
85 #endif
86 #if defined(__GLIBCXX_TYPE_INT_N_0)
87 static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_0)0 ) );
88 static_assert( test( (__GLIBCXX_TYPE_INT_N_0)0 ).did_not_match() );
89 #endif
90 #if defined(__GLIBCXX_TYPE_INT_N_1)
91 static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_1)0 ) );
92 static_assert( test( (__GLIBCXX_TYPE_INT_N_1)0 ).did_not_match() );
93 #endif
94 #if defined(__GLIBCXX_TYPE_INT_N_2)
95 static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_2)0 ) );
96 static_assert( test( (__GLIBCXX_TYPE_INT_N_2)0 ).did_not_match() );
97 #endif
98
99 #include <cstddef>
100 static_assert( test( (std::byte)0 ).did_not_match() );