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Diffstat (limited to 'libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/ispow2.cc')
| -rw-r--r-- | libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/ispow2.cc | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/ispow2.cc b/libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/ispow2.cc new file mode 100644 index 00000000000..ba8cfa8da7c --- /dev/null +++ b/libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/ispow2.cc @@ -0,0 +1,157 @@ +// Copyright (C) 2018 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + +// { dg-options "-std=gnu++2a" } +// { dg-do compile { target c++2a } } + +#include <bit> + +template<typename UInt> +constexpr auto +test(UInt x) +-> decltype(std::ispow2(x)) +{ + static_assert( noexcept(std::ispow2(x)) ); + + static_assert( ! std::ispow2( (UInt)0 ) ); + static_assert( ! std::ispow2( (UInt)-1 ) ); + static_assert( ! std::ispow2( (UInt)3 ) ); + static_assert( ! std::ispow2( (UInt)0x0f ) ); + static_assert( ! std::ispow2( (UInt)0xff ) ); + static_assert( ! std::ispow2( (UInt)0x0a ) ); + static_assert( ! std::ispow2( (UInt)0xa0 ) ); + + constexpr UInt one = 1; + static_assert( std::ispow2( (UInt)(one << 0) ) ); + + static_assert( std::ispow2( (UInt)(one << 1) ) ); + static_assert( std::ispow2( (UInt)(one << 2) ) ); + static_assert( std::ispow2( (UInt)(one << 3) ) ); + static_assert( std::ispow2( (UInt)(one << 4) ) ); + static_assert( std::ispow2( (UInt)(one << 5) ) ); + static_assert( std::ispow2( (UInt)(one << 6) ) ); + static_assert( std::ispow2( (UInt)(one << 7) ) ); + + if constexpr (std::numeric_limits<UInt>::digits > 8) + { + static_assert( std::ispow2( (UInt)(one << 8) ) ); + static_assert( std::ispow2( (UInt)(one << 9) ) ); + static_assert( std::ispow2( (UInt)(one << 10) ) ); + static_assert( std::ispow2( (UInt)(one << 11) ) ); + static_assert( std::ispow2( (UInt)(one << 12) ) ); + static_assert( std::ispow2( (UInt)(one << 13) ) ); + static_assert( std::ispow2( (UInt)(one << 14) ) ); + static_assert( std::ispow2( (UInt)(one << 15) ) ); + + static_assert( ! std::ispow2( (UInt)0xf000 ) ); + static_assert( ! std::ispow2( (UInt)0xff00 ) ); + static_assert( ! std::ispow2( (UInt)0xf0f0 ) ); + static_assert( ! std::ispow2( (UInt)0xf00f ) ); + static_assert( ! std::ispow2( (UInt)0x0f0f ) ); + static_assert( ! std::ispow2( (UInt)0x00ff ) ); + } + + if constexpr (std::numeric_limits<UInt>::digits > 16) + { + static_assert( std::ispow2( (UInt)(one << 16) ) ); + static_assert( std::ispow2( (UInt)(one << 17) ) ); + static_assert( ! std::ispow2( (UInt)((one << 16) + 1) ) ); + static_assert( ! std::ispow2( (UInt)((one << 16) + 0x10) ) ); + } + + // msp340 target has 20-bit __GLIBCXX_TYPE_INT_N_0 type + if constexpr (std::numeric_limits<UInt>::digits > 20) + { + static_assert( std::ispow2( (UInt)(one << 20) ) ); + static_assert( std::ispow2( (UInt)(one << 21) ) ); + static_assert( std::ispow2( (UInt)(one << 24) ) ); + static_assert( std::ispow2( (UInt)(one << 28) ) ); + static_assert( std::ispow2( (UInt)(one << 31) ) ); + } + + if constexpr (std::numeric_limits<UInt>::digits > 32) + { + static_assert( std::ispow2( (UInt)(one << 32) ) ); + static_assert( std::ispow2( (UInt)(one << 33) ) ); + static_assert( std::ispow2( (UInt)(one << 41) ) ); + + static_assert( ! std::ispow2( (UInt)((one << 32) + 1) ) ); + static_assert( ! std::ispow2( (UInt)((one << 32) + (one << 31)) ) ); + static_assert( ! std::ispow2( (UInt)((one << 33) + 1) ) ); + static_assert( ! std::ispow2( (UInt)((one << 33) + (one << 32)) ) ); + } + + if constexpr (std::numeric_limits<UInt>::digits == 64) + { + static_assert( std::ispow2( (UInt)(one << 63) ) ); + + static_assert( ! std::ispow2( (UInt)((one << 63) + 1) ) ); + static_assert( ! std::ispow2( (UInt)((one << 63) + (one << 8)) ) ); + static_assert( ! std::ispow2( (UInt)((one << 63) + (one << 32)) ) ); + } + return true; +} + +static_assert( test( (unsigned char)0 ) ); +static_assert( test( (unsigned short)0 ) ); +static_assert( test( (unsigned int)0 ) ); +static_assert( test( (unsigned long)0 ) ); +static_assert( test( (unsigned long long)0 ) ); + +// std::ispow2(T) shall not participate in overload resolution +// unless T is an unsigned integer type. +struct X { constexpr bool did_not_match() { return true; } }; +constexpr X test(...) { return X{}; } +static_assert( test( (bool)0 ).did_not_match() ); +static_assert( test( (char)0 ).did_not_match() ); +static_assert( test( (int)0 ).did_not_match() ); +static_assert( test( (char16_t)0 ).did_not_match() ); +static_assert( test( (float)0 ).did_not_match() ); +static_assert( test( (void*)0 ).did_not_match() ); +static_assert( test( X{} ).did_not_match() ); +enum E : unsigned { e }; +static_assert( test( e ).did_not_match() ); + +#ifndef __STRICT_ANSI__ +#include <cstddef> +static_assert( std::ispow2(std::byte{0}) == false ); +static_assert( std::ispow2(std::byte{1}) == true ); +static_assert( std::ispow2(std::byte{2}) == true ); +static_assert( std::ispow2(std::byte{3}) == false ); +static_assert( std::ispow2(std::byte{100}) == false ); +static_assert( std::ispow2(std::byte{128}) == true ); +static_assert( std::ispow2(std::byte{255}) == false ); +#else +static_assert( test( (std::byte)0 ).did_not_match() ); +#endif + +#if !defined(__STRICT_ANSI__) && defined _GLIBCXX_USE_INT128 +static_assert( test( (unsigned __int128)0 ) ); +static_assert( test( (__int128)0 ).did_not_match() ); +#endif +#if defined(__GLIBCXX_TYPE_INT_N_0) +static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_0)0 ) ); +static_assert( test( (__GLIBCXX_TYPE_INT_N_0)0 ).did_not_match() ); +#endif +#if defined(__GLIBCXX_TYPE_INT_N_1) +static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_1)0 ) ); +static_assert( test( (__GLIBCXX_TYPE_INT_N_1)0 ).did_not_match() ); +#endif +#if defined(__GLIBCXX_TYPE_INT_N_2) +static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_2)0 ) ); +static_assert( test( (__GLIBCXX_TYPE_INT_N_2)0 ).did_not_match() ); +#endif |