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libstdc++: Fix atomic<FP>::load (PR 95282)

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PR libstdc++/95282
	* include/bits/atomic_base.h (__atomic_impl::load): Add
	cv-qualifiers to parameter so that _Tp is deduced as the
	unqualified type.
	* testsuite/29_atomics/atomic_float/95282.cc: New test.
This commit is contained in:
Jonathan Wakely 2020-05-27 22:55:21 +01:00
parent 6c2582c040
commit bbaec68c86
2 changed files with 36 additions and 1 deletions
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2
libstdc++-v3/include/bits/atomic_base.h
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@ -871,7 +871,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
_GLIBCXX_ALWAYS_INLINE _Tp
load(_Tp* __ptr, memory_order __m) noexcept
load(const volatile _Tp* __ptr, memory_order __m) noexcept
{
alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
_Tp* __dest = reinterpret_cast<_Tp*>(__buf);

35
libstdc++-v3/testsuite/29_atomics/atomic_float/95282.cc Normal file
View file

@ -0,0 +1,35 @@
// Copyright (C) 2020 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 <atomic>
float
test01()
{
std::atomic<float> a;
return a.load();
}
float
test02()
{
volatile std::atomic<float> a;
return a.load();
}