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Removed clearing padding for class types on atomic_ref construction.

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We currently don't support clearing internal padding in structures,
and we cannot detect tail padding in structures either. So for now there
is no point in the CAS loop during atomic_ref construction.
This commit is contained in:
Andrey Semashev
2020-02-25 02:24:49 +03:00
parent a29acd7d0f
commit b95c39d5e1
1 changed files with 0 additions and 18 deletions
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18
include/boost/atomic/detail/atomic_ref_template.hpp
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@@ -144,7 +144,6 @@ public:
BOOST_DEFAULTED_FUNCTION(base_atomic_ref(base_atomic_ref const& that) BOOST_ATOMIC_DETAIL_DEF_NOEXCEPT_DECL, BOOST_ATOMIC_DETAIL_DEF_NOEXCEPT_IMPL : base_type(static_cast< base_type const& >(that)) {})
BOOST_FORCEINLINE explicit base_atomic_ref(value_type& v) BOOST_NOEXCEPT : base_type(v)
{
this->clear_padding_bits(has_padding_bits());
}
BOOST_FORCEINLINE void store(value_arg_type v, memory_order order = memory_order_seq_cst) const BOOST_NOEXCEPT
@@ -200,23 +199,6 @@ public:
BOOST_DELETED_FUNCTION(base_atomic_ref& operator=(base_atomic_ref const&))
private:
BOOST_FORCEINLINE void clear_padding_bits(atomics::detail::false_type) const BOOST_NOEXCEPT
{
}
BOOST_FORCEINLINE void clear_padding_bits(atomics::detail::true_type) const BOOST_NOEXCEPT
{
storage_type old_value = operations::load(this->storage(), boost::memory_order_relaxed);
while (true)
{
// bitwise_cast will zero tail padding bits
storage_type new_value = atomics::detail::bitwise_cast< storage_type >(atomics::detail::bitwise_cast< value_type >(old_value));
bool res = operations::compare_exchange_weak(this->storage(), old_value, new_value, boost::memory_order_relaxed, boost::memory_order_relaxed);
if (BOOST_LIKELY(res))
break;
}
}
BOOST_FORCEINLINE bool compare_exchange_strong_impl(value_type& expected, value_arg_type desired, memory_order success_order, memory_order failure_order, atomics::detail::false_type) const BOOST_NOEXCEPT
{
#if defined(BOOST_ATOMIC_DETAIL_STORAGE_TYPE_MAY_ALIAS)