comparison libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/bit_ceil_neg.cc @ 19:2b5abeee2509 default tip

update gcc11
author anatofuz
date Mon, 25 May 2020 07:50:57 +0900
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18:1830386684a0 19:2b5abeee2509
1 // Copyright (C) 2019-2020 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 -D_GLIBCXX_ASSERTIONS" }
19 // { dg-do run { target c++2a } }
20 // { dg-xfail-run-if "__glibcxx_assert in bit_ceil should fail" { *-*-* } }
21
22 #include <bit>
23 #include <limits>
24
25 // P1355R2: not a constant expression if the result is not representable
26
27 template<auto N, typename = void>
28 struct bit_ceil_valid
29 : std::false_type { };
30
31 template<auto N>
32 struct bit_ceil_valid<N, std::void_t<char[(std::bit_ceil(N), 1)]>>
33 : std::true_type { };
34
35 template<typename T>
36 constexpr T max = std::numeric_limits<T>::max();
37 template<typename T>
38 constexpr T maxpow2 = T(1) << (std::numeric_limits<T>::digits - 1);
39
40 static_assert( bit_ceil_valid<maxpow2<unsigned char>>() );
41 static_assert( !bit_ceil_valid<maxpow2<unsigned char> + (unsigned char)1>() );
42
43 static_assert( !bit_ceil_valid<max<unsigned char>>() );
44 static_assert( !bit_ceil_valid<max<unsigned char> - (unsigned char)1>() );
45
46 static_assert( bit_ceil_valid<maxpow2<unsigned short>>() );
47 static_assert( !bit_ceil_valid<maxpow2<unsigned short> + (unsigned short)1>() );
48 static_assert( !bit_ceil_valid<max<unsigned short>>() );
49 static_assert( !bit_ceil_valid<max<unsigned short> - (unsigned short)1>() );
50
51 static_assert( bit_ceil_valid<maxpow2<unsigned int>>() );
52 static_assert( !bit_ceil_valid<maxpow2<unsigned int> + 1u>() );
53 static_assert( !bit_ceil_valid<max<unsigned int>>() );
54 static_assert( !bit_ceil_valid<max<unsigned int> - 1u>() );
55
56 static_assert( bit_ceil_valid<maxpow2<unsigned long>>() );
57 static_assert( !bit_ceil_valid<maxpow2<unsigned long> + 1ul>() );
58 static_assert( !bit_ceil_valid<max<unsigned long>>() );
59 static_assert( !bit_ceil_valid<max<unsigned long> - 1ul>() );
60
61 static_assert( bit_ceil_valid<maxpow2<unsigned long long>>() );
62 static_assert( !bit_ceil_valid<maxpow2<unsigned long long> + 1ull>() );
63 static_assert( !bit_ceil_valid<max<unsigned long long>>() );
64 static_assert( !bit_ceil_valid<max<unsigned long long> - 1ull>() );
65
66 void
67 test01()
68 {
69 std::bit_ceil( maxpow2<unsigned> + 1u ); // should fail __glibcxx_assert
70 }
71
72 int main()
73 {
74 test01();
75 }