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1 // Copyright (C) 2018-2020 Free Software Foundation, Inc.
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2 //
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3 // This file is part of the GNU ISO C++ Library. This library is free
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4 // software; you can redistribute it and/or modify it under the
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5 // terms of the GNU General Public License as published by the
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6 // Free Software Foundation; either version 3, or (at your option)
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7 // any later version.
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8
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9 // This library is distributed in the hope that it will be useful,
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10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 // GNU General Public License for more details.
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13
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14 // You should have received a copy of the GNU General Public License along
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15 // with this library; see the file COPYING3. If not see
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16 // <http://www.gnu.org/licenses/>.
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17
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18 // { dg-options "-std=gnu++2a" }
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19 // { dg-do compile { target c++2a } }
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20
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21 #include <bit>
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22 #include <limits>
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23
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24 template<typename UInt>
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25 constexpr auto
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26 test(UInt x)
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27 -> decltype(std::bit_floor(x))
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28 {
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29 static_assert( noexcept(std::bit_floor(x)) );
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30
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31 static_assert( std::bit_floor(UInt(0)) == 0 );
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32 static_assert( std::bit_floor(UInt(1)) == 1 );
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33 static_assert( std::bit_floor(UInt(2)) == 2 );
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34 static_assert( std::bit_floor(UInt(3)) == 2 );
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35 static_assert( std::bit_floor(UInt(4)) == 4 );
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36 static_assert( std::bit_floor(UInt(0x11)) == 0x10 );
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37 static_assert( std::bit_floor(UInt(0x20)) == 0x20 );
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38
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39 if constexpr (std::numeric_limits<UInt>::digits > 8)
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40 {
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41 static_assert( std::bit_floor(UInt(0x201)) == 0x200 );
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42 static_assert( std::bit_floor(UInt(0x8ff)) == 0x800 );
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43 static_assert( std::bit_floor(UInt(0x1000)) == 0x1000 );
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44 }
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45
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46 if constexpr (std::numeric_limits<UInt>::digits > 32)
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47 {
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48 static_assert( std::bit_floor(UInt(0xabcdef)) == 0x800000 );
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49 static_assert( std::bit_floor(UInt(0x1000000)) == 0x1000000 );
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50 static_assert( std::bit_floor(UInt(0x1000001)) == 0x1000000 );
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51 }
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52
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53 if constexpr (std::numeric_limits<UInt>::digits > 64)
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54 {
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55 static_assert( std::bit_floor(UInt(1) << 64) == (UInt(1) << 64) );
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56 static_assert( std::bit_floor(UInt(3) << 64) == (UInt(2) << 64) );
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57 }
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58
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59 return true;
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60 }
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61
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62 static_assert( test( (unsigned char)0 ) );
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63 static_assert( test( (unsigned short)0 ) );
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64 static_assert( test( (unsigned int)0 ) );
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65 static_assert( test( (unsigned long)0 ) );
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66 static_assert( test( (unsigned long long)0 ) );
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67
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68 // std::bit_floor(T) shall not participate in overload resolution
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69 // unless T is an unsigned integer type.
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70 struct X { constexpr bool did_not_match() { return true; } };
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71 constexpr X test(...) { return X{}; }
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72 static_assert( test( (bool)0 ).did_not_match() );
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73 static_assert( test( (char)0 ).did_not_match() );
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74 static_assert( test( (int)0 ).did_not_match() );
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75 static_assert( test( (char16_t)0 ).did_not_match() );
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76 static_assert( test( (float)0 ).did_not_match() );
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77 static_assert( test( (void*)0 ).did_not_match() );
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78 static_assert( test( X{} ).did_not_match() );
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79 enum E : unsigned { e };
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80 static_assert( test( e ).did_not_match() );
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81
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82 #if !defined(__STRICT_ANSI__) && defined _GLIBCXX_USE_INT128
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83 static_assert( test( (unsigned __int128)0 ) );
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84 static_assert( test( (__int128)0 ).did_not_match() );
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85 #endif
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86 #if defined(__GLIBCXX_TYPE_INT_N_0)
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87 static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_0)0 ) );
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88 static_assert( test( (__GLIBCXX_TYPE_INT_N_0)0 ).did_not_match() );
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89 #endif
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90 #if defined(__GLIBCXX_TYPE_INT_N_1)
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91 static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_1)0 ) );
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92 static_assert( test( (__GLIBCXX_TYPE_INT_N_1)0 ).did_not_match() );
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93 #endif
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94 #if defined(__GLIBCXX_TYPE_INT_N_2)
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95 static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_2)0 ) );
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96 static_assert( test( (__GLIBCXX_TYPE_INT_N_2)0 ).did_not_match() );
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97 #endif
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98
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99 #include <cstddef>
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100 static_assert( test( (std::byte)0 ).did_not_match() );
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