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* [gcc/devel/gccgo] libstdc++: Fix atomic<FP>::load (PR 95282)
@ 2020-07-12 18:40 Ian Lance Taylor
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From: Ian Lance Taylor @ 2020-07-12 18:40 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:bbaec68c86f8e89a3460cc022c75d4c4179bfb0a
commit bbaec68c86f8e89a3460cc022c75d4c4179bfb0a
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed May 27 22:55:21 2020 +0100
libstdc++: Fix atomic<FP>::load (PR 95282)
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.
Diff:
---
libstdc++-v3/include/bits/atomic_base.h | 2 +-
.../testsuite/29_atomics/atomic_float/95282.cc | 35 ++++++++++++++++++++++
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index 3b66b040976..01f77a0f372 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -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);
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_float/95282.cc b/libstdc++-v3/testsuite/29_atomics/atomic_float/95282.cc
new file mode 100644
index 00000000000..2de751c6ad4
--- /dev/null
+++ b/libstdc++-v3/testsuite/29_atomics/atomic_float/95282.cc
@@ -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();
+}
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