From: Jonathan Wakely Date: Thu, 11 Jul 2019 19:43:25 +0000 (+0100) Subject: Define std::atomic_ref and std::atomic for C++20 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a90fe12c80a13ffed9d5c775703788275d8b7c42;p=gcc.git Define std::atomic_ref and std::atomic for C++20 This adds the new atomic types from C++2a, as proposed by P0019 and P0020. To reduce duplication the calls to the compiler's atomic built-ins are wrapped in new functions in the __atomic_impl namespace. These functions are currently only used by std::atomic and std::atomic_ref but could also be used for all other specializations of std::atomic. * include/bits/atomic_base.h (__atomic_impl): New namespace for wrappers around atomic built-ins. (__atomic_float, __atomic_ref): New class templates for use as base classes. * include/std/atomic (atomic, atomic) (atomic): New explicit specializations. (atomic_ref): New class template. (__cpp_lib_atomic_ref): Define. * include/std/version (__cpp_lib_atomic_ref): Define. * testsuite/29_atomics/atomic/60695.cc: Adjust dg-error. * testsuite/29_atomics/atomic_float/1.cc: New test. * testsuite/29_atomics/atomic_float/requirements.cc: New test. * testsuite/29_atomics/atomic_ref/deduction.cc: New test. * testsuite/29_atomics/atomic_ref/float.cc: New test. * testsuite/29_atomics/atomic_ref/generic.cc: New test. * testsuite/29_atomics/atomic_ref/integral.cc: New test. * testsuite/29_atomics/atomic_ref/pointer.cc: New test. * testsuite/29_atomics/atomic_ref/requirements.cc: New test. From-SVN: r273420 --- diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog index f595f9d664e..688615f48c9 100644 --- a/libstdc++-v3/ChangeLog +++ b/libstdc++-v3/ChangeLog @@ -1,3 +1,24 @@ +2019-07-11 Jonathan Wakely + + * include/bits/atomic_base.h (__atomic_impl): New namespace for + wrappers around atomic built-ins. + (__atomic_float, __atomic_ref): New class templates for use as base + classes. + * include/std/atomic (atomic, atomic) + (atomic): New explicit specializations. + (atomic_ref): New class template. + (__cpp_lib_atomic_ref): Define. + * include/std/version (__cpp_lib_atomic_ref): Define. + * testsuite/29_atomics/atomic/60695.cc: Adjust dg-error. + * testsuite/29_atomics/atomic_float/1.cc: New test. + * testsuite/29_atomics/atomic_float/requirements.cc: New test. + * testsuite/29_atomics/atomic_ref/deduction.cc: New test. + * testsuite/29_atomics/atomic_ref/float.cc: New test. + * testsuite/29_atomics/atomic_ref/generic.cc: New test. + * testsuite/29_atomics/atomic_ref/integral.cc: New test. + * testsuite/29_atomics/atomic_ref/pointer.cc: New test. + * testsuite/29_atomics/atomic_ref/requirements.cc: New test. + 2019-07-06 Jonathan Wakely * include/ext/atomicity.h (__exchange_and_add, __atomic_add): Replace diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h index e30caef91bf..146e70a9f2e 100644 --- a/libstdc++-v3/include/bits/atomic_base.h +++ b/libstdc++-v3/include/bits/atomic_base.h @@ -35,6 +35,7 @@ #include #include #include +#include #ifndef _GLIBCXX_ALWAYS_INLINE #define _GLIBCXX_ALWAYS_INLINE inline __attribute__((__always_inline__)) @@ -817,6 +818,876 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), int(__m)); } }; +#if __cplusplus > 201703L + // Implementation details of atomic_ref and atomic. + namespace __atomic_impl + { + // Remove volatile and create a non-deduced context for value arguments. + template + using _Val = remove_volatile_t<_Tp>; + + // As above, but for difference_type arguments. + template + using _Diff = conditional_t, ptrdiff_t, _Val<_Tp>>; + + template + _GLIBCXX_ALWAYS_INLINE bool + is_lock_free() noexcept + { + // Produce a fake, minimally aligned pointer. + return __atomic_is_lock_free(_Size, reinterpret_cast(-_Align)); + } + + template + _GLIBCXX_ALWAYS_INLINE void + store(_Tp* __ptr, _Val<_Tp> __t, memory_order __m) noexcept + { __atomic_store(__ptr, std::__addressof(__t), int(__m)); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + load(_Tp* __ptr, memory_order __m) noexcept + { + alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; + _Tp* __dest = reinterpret_cast<_Tp*>(__buf); + __atomic_load(__ptr, __dest, int(__m)); + return *__dest; + } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + exchange(_Tp* __ptr, _Val<_Tp> __desired, memory_order __m) noexcept + { + alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; + _Tp* __dest = reinterpret_cast<_Tp*>(__buf); + __atomic_exchange(__ptr, std::__addressof(__desired), __dest, int(__m)); + return *__dest; + } + + template + _GLIBCXX_ALWAYS_INLINE bool + compare_exchange_weak(_Tp* __ptr, _Val<_Tp>& __expected, + _Val<_Tp> __desired, memory_order __success, + memory_order __failure) noexcept + { + return __atomic_compare_exchange(__ptr, std::__addressof(__expected), + std::__addressof(__desired), true, + int(__success), int(__failure)); + } + + template + _GLIBCXX_ALWAYS_INLINE bool + compare_exchange_strong(_Tp* __ptr, _Val<_Tp>& __expected, + _Val<_Tp> __desired, memory_order __success, + memory_order __failure) noexcept + { + return __atomic_compare_exchange(__ptr, std::__addressof(__expected), + std::__addressof(__desired), false, + int(__success), int(__failure)); + } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + fetch_add(_Tp* __ptr, _Diff<_Tp> __i, memory_order __m) noexcept + { return __atomic_fetch_add(__ptr, __i, int(__m)); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + fetch_sub(_Tp* __ptr, _Diff<_Tp> __i, memory_order __m) noexcept + { return __atomic_fetch_sub(__ptr, __i, int(__m)); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + fetch_and(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept + { return __atomic_fetch_and(__ptr, __i, int(__m)); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + fetch_or(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept + { return __atomic_fetch_or(__ptr, __i, int(__m)); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + fetch_xor(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept + { return __atomic_fetch_xor(__ptr, __i, int(__m)); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + __add_fetch(_Tp* __ptr, _Diff<_Tp> __i) noexcept + { return __atomic_add_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + __sub_fetch(_Tp* __ptr, _Diff<_Tp> __i) noexcept + { return __atomic_sub_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + __and_fetch(_Tp* __ptr, _Val<_Tp> __i) noexcept + { return __atomic_and_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + __or_fetch(_Tp* __ptr, _Val<_Tp> __i) noexcept + { return __atomic_or_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } + + template + _GLIBCXX_ALWAYS_INLINE _Tp + __xor_fetch(_Tp* __ptr, _Val<_Tp> __i) noexcept + { return __atomic_xor_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } + + template + _Tp + __fetch_add_flt(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept + { + _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); + _Val<_Tp> __newval = __oldval + __i; + while (!compare_exchange_weak(__ptr, __oldval, __newval, __m, + memory_order_relaxed)) + __newval = __oldval + __i; + return __oldval; + } + + template + _Tp + __fetch_sub_flt(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept + { + _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); + _Val<_Tp> __newval = __oldval - __i; + while (!compare_exchange_weak(__ptr, __oldval, __newval, __m, + memory_order_relaxed)) + __newval = __oldval - __i; + return __oldval; + } + + template + _Tp + __add_fetch_flt(_Tp* __ptr, _Val<_Tp> __i) noexcept + { + _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); + _Val<_Tp> __newval = __oldval + __i; + while (!compare_exchange_weak(__ptr, __oldval, __newval, + memory_order_seq_cst, + memory_order_relaxed)) + __newval = __oldval + __i; + return __newval; + } + + template + _Tp + __sub_fetch_flt(_Tp* __ptr, _Val<_Tp> __i) noexcept + { + _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); + _Val<_Tp> __newval = __oldval - __i; + while (!compare_exchange_weak(__ptr, __oldval, __newval, + memory_order_seq_cst, + memory_order_relaxed)) + __newval = __oldval - __i; + return __newval; + } + } // namespace __atomic_impl + + // base class for atomic + template + struct __atomic_float + { + static_assert(is_floating_point_v<_Fp>); + + static constexpr size_t _S_alignment = __alignof__(_Fp); + + public: + using value_type = _Fp; + using difference_type = value_type; + + static constexpr bool is_always_lock_free + = __atomic_always_lock_free(sizeof(_Fp), 0); + + __atomic_float() = default; + + constexpr + __atomic_float(_Fp __t) : _M_fp(__t) + { } + + __atomic_float(const __atomic_float&) = delete; + __atomic_float& operator=(const __atomic_float&) = delete; + __atomic_float& operator=(const __atomic_float&) volatile = delete; + + _Fp + operator=(_Fp __t) volatile noexcept + { + this->store(__t); + return __t; + } + + _Fp + operator=(_Fp __t) noexcept + { + this->store(__t); + return __t; + } + + bool + is_lock_free() const volatile noexcept + { return __atomic_impl::is_lock_free(); } + + bool + is_lock_free() const noexcept + { return __atomic_impl::is_lock_free(); } + + void + store(_Fp __t, memory_order __m = memory_order_seq_cst) volatile noexcept + { __atomic_impl::store(&_M_fp, __t, __m); } + + void + store(_Fp __t, memory_order __m = memory_order_seq_cst) noexcept + { __atomic_impl::store(&_M_fp, __t, __m); } + + _Fp + load(memory_order __m = memory_order_seq_cst) const volatile noexcept + { return __atomic_impl::load(&_M_fp, __m); } + + _Fp + load(memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::load(&_M_fp, __m); } + + operator _Fp() const volatile noexcept { return this->load(); } + operator _Fp() const noexcept { return this->load(); } + + _Fp + exchange(_Fp __desired, + memory_order __m = memory_order_seq_cst) volatile noexcept + { return __atomic_impl::exchange(&_M_fp, __desired, __m); } + + _Fp + exchange(_Fp __desired, + memory_order __m = memory_order_seq_cst) noexcept + { return __atomic_impl::exchange(&_M_fp, __desired, __m); } + + bool + compare_exchange_weak(_Fp& __expected, _Fp __desired, + memory_order __success, + memory_order __failure) noexcept + { + return __atomic_impl::compare_exchange_weak(&_M_fp, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_weak(_Fp& __expected, _Fp __desired, + memory_order __success, + memory_order __failure) volatile noexcept + { + return __atomic_impl::compare_exchange_weak(&_M_fp, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_strong(_Fp& __expected, _Fp __desired, + memory_order __success, + memory_order __failure) noexcept + { + return __atomic_impl::compare_exchange_strong(&_M_fp, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_strong(_Fp& __expected, _Fp __desired, + memory_order __success, + memory_order __failure) volatile noexcept + { + return __atomic_impl::compare_exchange_strong(&_M_fp, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_weak(_Fp& __expected, _Fp __desired, + memory_order __order = memory_order_seq_cst) + noexcept + { + return compare_exchange_weak(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_weak(_Fp& __expected, _Fp __desired, + memory_order __order = memory_order_seq_cst) + volatile noexcept + { + return compare_exchange_weak(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_strong(_Fp& __expected, _Fp __desired, + memory_order __order = memory_order_seq_cst) + noexcept + { + return compare_exchange_strong(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_strong(_Fp& __expected, _Fp __desired, + memory_order __order = memory_order_seq_cst) + volatile noexcept + { + return compare_exchange_strong(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + value_type + fetch_add(value_type __i, + memory_order __m = memory_order_seq_cst) noexcept + { return __atomic_impl::__fetch_add_flt(&_M_fp, __i, __m); } + + value_type + fetch_add(value_type __i, + memory_order __m = memory_order_seq_cst) volatile noexcept + { return __atomic_impl::__fetch_add_flt(&_M_fp, __i, __m); } + + value_type + fetch_sub(value_type __i, + memory_order __m = memory_order_seq_cst) noexcept + { return __atomic_impl::__fetch_sub_flt(&_M_fp, __i, __m); } + + value_type + fetch_sub(value_type __i, + memory_order __m = memory_order_seq_cst) volatile noexcept + { return __atomic_impl::__fetch_sub_flt(&_M_fp, __i, __m); } + + value_type + operator+=(value_type __i) noexcept + { return __atomic_impl::__add_fetch_flt(&_M_fp, __i); } + + value_type + operator+=(value_type __i) volatile noexcept + { return __atomic_impl::__add_fetch_flt(&_M_fp, __i); } + + value_type + operator-=(value_type __i) noexcept + { return __atomic_impl::__sub_fetch_flt(&_M_fp, __i); } + + value_type + operator-=(value_type __i) volatile noexcept + { return __atomic_impl::__sub_fetch_flt(&_M_fp, __i); } + + private: + alignas(_S_alignment) _Fp _M_fp; + }; + + template, bool = is_floating_point_v<_Tp>> + struct __atomic_ref; + + // base class for non-integral, non-floating-point, non-pointer types + template + struct __atomic_ref<_Tp, false, false> + { + static_assert(is_trivially_copyable_v<_Tp>); + + // 1/2/4/8/16-byte types must be aligned to at least their size. + static constexpr int _S_min_alignment + = (sizeof(_Tp) & (sizeof(_Tp) - 1)) || sizeof(_Tp) > 16 + ? 0 : sizeof(_Tp); + + public: + using value_type = _Tp; + + static constexpr bool is_always_lock_free + = __atomic_always_lock_free(sizeof(_Tp), 0); + + static constexpr size_t required_alignment + = _S_min_alignment > alignof(_Tp) ? _S_min_alignment : alignof(_Tp); + + __atomic_ref& operator=(const __atomic_ref&) = delete; + + explicit + __atomic_ref(_Tp& __t) : _M_ptr(std::__addressof(__t)) + { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } + + __atomic_ref(const __atomic_ref&) noexcept = default; + + _Tp + operator=(_Tp __t) const noexcept + { + this->store(__t); + return __t; + } + + operator _Tp() const noexcept { return this->load(); } + + bool + is_lock_free() const noexcept + { return __atomic_impl::is_lock_free(); } + + void + store(_Tp __t, memory_order __m = memory_order_seq_cst) const noexcept + { __atomic_impl::store(_M_ptr, __t, __m); } + + _Tp + load(memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::load(_M_ptr, __m); } + + _Tp + exchange(_Tp __desired, memory_order __m = memory_order_seq_cst) + const noexcept + { return __atomic_impl::exchange(_M_ptr, __desired, __m); } + + bool + compare_exchange_weak(_Tp& __expected, _Tp __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_weak(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_strong(_Tp& __expected, _Tp __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_strong(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_weak(_Tp& __expected, _Tp __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_weak(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_strong(_Tp& __expected, _Tp __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_strong(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + private: + _Tp* _M_ptr; + }; + + // base class for atomic_ref + template + struct __atomic_ref<_Tp, true, false> + { + static_assert(is_integral_v<_Tp>); + + public: + using value_type = _Tp; + using difference_type = value_type; + + static constexpr bool is_always_lock_free + = __atomic_always_lock_free(sizeof(_Tp), 0); + + static constexpr size_t required_alignment + = sizeof(_Tp) > alignof(_Tp) ? sizeof(_Tp) : alignof(_Tp); + + __atomic_ref() = delete; + __atomic_ref& operator=(const __atomic_ref&) = delete; + + explicit + __atomic_ref(_Tp& __t) : _M_ptr(&__t) + { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } + + __atomic_ref(const __atomic_ref&) noexcept = default; + + _Tp + operator=(_Tp __t) const noexcept + { + this->store(__t); + return __t; + } + + operator _Tp() const noexcept { return this->load(); } + + bool + is_lock_free() const noexcept + { + return __atomic_impl::is_lock_free(); + } + + void + store(_Tp __t, memory_order __m = memory_order_seq_cst) const noexcept + { __atomic_impl::store(_M_ptr, __t, __m); } + + _Tp + load(memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::load(_M_ptr, __m); } + + _Tp + exchange(_Tp __desired, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::exchange(_M_ptr, __desired, __m); } + + bool + compare_exchange_weak(_Tp& __expected, _Tp __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_weak(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_strong(_Tp& __expected, _Tp __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_strong(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_weak(_Tp& __expected, _Tp __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_weak(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_strong(_Tp& __expected, _Tp __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_strong(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + value_type + fetch_add(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_add(_M_ptr, __i, __m); } + + value_type + fetch_sub(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_sub(_M_ptr, __i, __m); } + + value_type + fetch_and(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_and(_M_ptr, __i, __m); } + + value_type + fetch_or(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_or(_M_ptr, __i, __m); } + + value_type + fetch_xor(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_xor(_M_ptr, __i, __m); } + + _GLIBCXX_ALWAYS_INLINE value_type + operator++(int) const noexcept + { return fetch_add(1); } + + _GLIBCXX_ALWAYS_INLINE value_type + operator--(int) const noexcept + { return fetch_sub(1); } + + value_type + operator++() const noexcept + { return __atomic_impl::__add_fetch(_M_ptr, value_type(1)); } + + value_type + operator--() const noexcept + { return __atomic_impl::__sub_fetch(_M_ptr, value_type(1)); } + + value_type + operator+=(value_type __i) const noexcept + { return __atomic_impl::__add_fetch(_M_ptr, __i); } + + value_type + operator-=(value_type __i) const noexcept + { return __atomic_impl::__sub_fetch(_M_ptr, __i); } + + value_type + operator&=(value_type __i) const noexcept + { return __atomic_impl::__and_fetch(_M_ptr, __i); } + + value_type + operator|=(value_type __i) const noexcept + { return __atomic_impl::__or_fetch(_M_ptr, __i); } + + value_type + operator^=(value_type __i) const noexcept + { return __atomic_impl::__xor_fetch(_M_ptr, __i); } + + private: + _Tp* _M_ptr; + }; + + // base class for atomic_ref + template + struct __atomic_ref<_Fp, false, true> + { + static_assert(is_floating_point_v<_Fp>); + + public: + using value_type = _Fp; + using difference_type = value_type; + + static constexpr bool is_always_lock_free + = __atomic_always_lock_free(sizeof(_Fp), 0); + + static constexpr size_t required_alignment = __alignof__(_Fp); + + __atomic_ref() = delete; + __atomic_ref& operator=(const __atomic_ref&) = delete; + + explicit + __atomic_ref(_Fp& __t) : _M_ptr(&__t) + { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } + + __atomic_ref(const __atomic_ref&) noexcept = default; + + _Fp + operator=(_Fp __t) const noexcept + { + this->store(__t); + return __t; + } + + operator _Fp() const noexcept { return this->load(); } + + bool + is_lock_free() const noexcept + { + return __atomic_impl::is_lock_free(); + } + + void + store(_Fp __t, memory_order __m = memory_order_seq_cst) const noexcept + { __atomic_impl::store(_M_ptr, __t, __m); } + + _Fp + load(memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::load(_M_ptr, __m); } + + _Fp + exchange(_Fp __desired, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::exchange(_M_ptr, __desired, __m); } + + bool + compare_exchange_weak(_Fp& __expected, _Fp __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_weak(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_strong(_Fp& __expected, _Fp __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_strong(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_weak(_Fp& __expected, _Fp __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_weak(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_strong(_Fp& __expected, _Fp __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_strong(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + value_type + fetch_add(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::__fetch_add_flt(_M_ptr, __i, __m); } + + value_type + fetch_sub(value_type __i, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::__fetch_sub_flt(_M_ptr, __i, __m); } + + value_type + operator+=(value_type __i) const noexcept + { return __atomic_impl::__add_fetch_flt(_M_ptr, __i); } + + value_type + operator-=(value_type __i) const noexcept + { return __atomic_impl::__sub_fetch_flt(_M_ptr, __i); } + + private: + _Fp* _M_ptr; + }; + + // base class for atomic_ref + template + struct __atomic_ref<_Tp*, false, false> + { + public: + using value_type = _Tp*; + using difference_type = ptrdiff_t; + + static constexpr bool is_always_lock_free = ATOMIC_POINTER_LOCK_FREE == 2; + + static constexpr size_t required_alignment = __alignof__(_Tp*); + + __atomic_ref() = delete; + __atomic_ref& operator=(const __atomic_ref&) = delete; + + explicit + __atomic_ref(_Tp*& __t) : _M_ptr(std::__addressof(__t)) + { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } + + __atomic_ref(const __atomic_ref&) noexcept = default; + + _Tp* + operator=(_Tp* __t) const noexcept + { + this->store(__t); + return __t; + } + + operator _Tp*() const noexcept { return this->load(); } + + bool + is_lock_free() const noexcept + { + return __atomic_impl::is_lock_free(); + } + + void + store(_Tp* __t, memory_order __m = memory_order_seq_cst) const noexcept + { __atomic_impl::store(_M_ptr, __t, __m); } + + _Tp* + load(memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::load(_M_ptr, __m); } + + _Tp* + exchange(_Tp* __desired, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::exchange(_M_ptr, __desired, __m); } + + bool + compare_exchange_weak(_Tp*& __expected, _Tp* __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_weak(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_strong(_Tp*& __expected, _Tp* __desired, + memory_order __success, + memory_order __failure) const noexcept + { + return __atomic_impl::compare_exchange_strong(_M_ptr, + __expected, __desired, + __success, __failure); + } + + bool + compare_exchange_weak(_Tp*& __expected, _Tp* __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_weak(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + bool + compare_exchange_strong(_Tp*& __expected, _Tp* __desired, + memory_order __order = memory_order_seq_cst) + const noexcept + { + return compare_exchange_strong(__expected, __desired, __order, + __cmpexch_failure_order(__order)); + } + + _GLIBCXX_ALWAYS_INLINE value_type + fetch_add(difference_type __d, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_add(_M_ptr, _S_type_size(__d), __m); } + + _GLIBCXX_ALWAYS_INLINE value_type + fetch_sub(difference_type __d, + memory_order __m = memory_order_seq_cst) const noexcept + { return __atomic_impl::fetch_sub(_M_ptr, _S_type_size(__d), __m); } + + value_type + operator++(int) const noexcept + { return fetch_add(1); } + + value_type + operator--(int) const noexcept + { return fetch_sub(1); } + + value_type + operator++() const noexcept + { + return __atomic_impl::__add_fetch(_M_ptr, _S_type_size(1)); + } + + value_type + operator--() const noexcept + { + return __atomic_impl::__sub_fetch(_M_ptr, _S_type_size(1)); + } + + value_type + operator+=(difference_type __d) const noexcept + { + return __atomic_impl::__add_fetch(_M_ptr, _S_type_size(__d)); + } + + value_type + operator-=(difference_type __d) const noexcept + { + return __atomic_impl::__sub_fetch(_M_ptr, _S_type_size(__d)); + } + + private: + static constexpr ptrdiff_t + _S_type_size(ptrdiff_t __d) noexcept + { + static_assert(is_object_v<_Tp>); + return __d * sizeof(_Tp); + } + + _Tp** _M_ptr; + }; + +#endif // C++2a + // @} group atomics _GLIBCXX_END_NAMESPACE_VERSION diff --git a/libstdc++-v3/include/std/atomic b/libstdc++-v3/include/std/atomic index 699431e9727..26d8d3946da 100644 --- a/libstdc++-v3/include/std/atomic +++ b/libstdc++-v3/include/std/atomic @@ -39,7 +39,6 @@ #else #include -#include namespace std _GLIBCXX_VISIBILITY(default) { @@ -1472,6 +1471,71 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION __atomic_val_t<_ITp> __i) noexcept { return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); } +#if __cplusplus > 201703L + template<> + struct atomic : __atomic_float + { + atomic() noexcept = default; + + constexpr + atomic(float __fp) noexcept : __atomic_float(__fp) + { } + + atomic& operator=(const atomic&) volatile = delete; + atomic& operator=(const atomic&) = delete; + + using __atomic_float::operator=; + }; + + template<> + struct atomic : __atomic_float + { + atomic() noexcept = default; + + constexpr + atomic(double __fp) noexcept : __atomic_float(__fp) + { } + + atomic& operator=(const atomic&) volatile = delete; + atomic& operator=(const atomic&) = delete; + + using __atomic_float::operator=; + }; + + template<> + struct atomic : __atomic_float + { + atomic() noexcept = default; + + constexpr + atomic(long double __fp) noexcept : __atomic_float(__fp) + { } + + atomic& operator=(const atomic&) volatile = delete; + atomic& operator=(const atomic&) = delete; + + using __atomic_float::operator=; + }; + +#define __cpp_lib_atomic_ref 201806L + + /// Class template to provide atomic operations on a non-atomic variable. + template + struct atomic_ref : __atomic_ref<_Tp> + { + explicit + atomic_ref(_Tp& __t) noexcept : __atomic_ref<_Tp>(__t) + { } + + atomic_ref& operator=(const atomic_ref&) = delete; + + atomic_ref(const atomic_ref&) = default; + + using __atomic_ref<_Tp>::operator=; + }; + +#endif // C++2a + // @} group atomics _GLIBCXX_END_NAMESPACE_VERSION diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version index e300fc38bc7..d134f7fde01 100644 --- a/libstdc++-v3/include/std/version +++ b/libstdc++-v3/include/std/version @@ -150,6 +150,7 @@ #if __cplusplus > 201703L // c++2a +#define __cpp_lib_atomic_ref 201806L #define __cpp_lib_bind_front 201902L #define __cpp_lib_bounded_array_traits 201902L #if __cpp_impl_destroying_delete diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/60695.cc b/libstdc++-v3/testsuite/29_atomics/atomic/60695.cc index 58d554cefc1..5065730dd91 100644 --- a/libstdc++-v3/testsuite/29_atomics/atomic/60695.cc +++ b/libstdc++-v3/testsuite/29_atomics/atomic/60695.cc @@ -27,4 +27,4 @@ struct X { char stuff[0]; // GNU extension, type has zero size }; -std::atomic a; // { dg-error "not supported" "" { target *-*-* } 194 } +std::atomic a; // { dg-error "zero-sized types" "" { target *-*-* } 0 } diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_float/1.cc b/libstdc++-v3/testsuite/29_atomics/atomic_float/1.cc new file mode 100644 index 00000000000..bd0e353538d --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_float/1.cc @@ -0,0 +1,573 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do run { target c++2a } } + +#include +#include + +void +test01() +{ + const auto mo = std::memory_order_relaxed; + bool ok; + float expected; + + if constexpr (std::atomic::is_always_lock_free) + { + std::atomic a0; + std::atomic a1(1.0f); + ok = a0.is_lock_free(); + a0 = a1.load(); + VERIFY( a0.load() == a1.load() ); + VERIFY( a0.load(mo) == a0.load() ); + a0.store(0.5f); + a1.store(0.5f, mo); + VERIFY( a0.load() == a1.load() ); + auto f0 = a0.exchange(12.5f); + auto f1 = a1.exchange(12.5f, mo); + VERIFY( a0 == 12.5f ); + VERIFY( a0.load() == a1.load() ); + VERIFY( f0 == 0.5f ); + VERIFY( f0 == f1 ); + + expected = 12.5f; + while (!a0.compare_exchange_weak(expected, 1.6f, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == 1.6f ); + VERIFY( expected == 12.5f ); + expected = 1.5f; + ok = a1.compare_exchange_weak(expected, 1.6f, mo, mo); + VERIFY( !ok && a1.load() == 12.5f && expected == 12.5f ); + VERIFY( expected == 12.5f ); + expected = 1.6f; + ok = a0.compare_exchange_strong(expected, 3.2f, mo, mo); + VERIFY( ok && a0.load() == 3.2f ); + VERIFY( expected == 1.6f ); + expected = 1.5f; + ok = a1.compare_exchange_strong(expected, 3.2f, mo, mo); + VERIFY( !ok && a1.load() == 12.5f && expected == 12.5f ); + + expected = 3.2f; + while (!a0.compare_exchange_weak(expected, .64f)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == .64f ); + expected = 12.5f; + while (!a1.compare_exchange_weak(expected, 1.6f, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a1.load() == 1.6f ); + expected = 0.5f; + ok = a0.compare_exchange_weak(expected, 3.2f); + VERIFY( !ok && a0.load() == .64f && expected == .64f ); + expected = 0.5f; + ok = a1.compare_exchange_weak(expected, 3.2f, mo); + VERIFY( !ok && a1.load() == 1.6f && expected == 1.6f ); + + expected = .64f; + ok = a0.compare_exchange_strong(expected, 12.8f); + VERIFY( ok && a0.load() == 12.8f ); + expected = 1.6f; + ok = a1.compare_exchange_strong(expected, 2.56f, mo); + VERIFY( ok && a1.load() == 2.56f ); + expected = 0.5f; + ok = a0.compare_exchange_strong(expected, 3.2f); + VERIFY( !ok && a0.load() == 12.8f && expected == 12.8f ); + expected = 0.5f; + ok = a1.compare_exchange_strong(expected, 3.2f, mo); + VERIFY( !ok && a1.load() == 2.56f && expected == 2.56f ); + + f0 = a0.fetch_add(1.2f); + VERIFY( f0 == 12.8f ); + VERIFY( a0 == 14.0f ); + f1 = a1.fetch_add(2.4f, mo); + VERIFY( f1 == 2.56f ); + VERIFY( a1 == 4.96f ); + + f0 = a0.fetch_sub(1.2f); + VERIFY( f0 == 14.0f ); + VERIFY( a0 == 12.8f ); + f1 = a1.fetch_sub(3.5f, mo); + VERIFY( f1 == 4.96f ); + VERIFY( a1 == 1.46f ); + + f0 = a0 += 1.2f; + VERIFY( f0 == 14.0f ); + VERIFY( a0 == 14.0f ); + + f0 = a0 -= 0.8f; + VERIFY( f0 == 13.2f ); + VERIFY( a0 == 13.2f ); + } + + // Repeat for volatile std::atomic + if constexpr (std::atomic::is_always_lock_free) + { + volatile std::atomic a0; + volatile std::atomic a1(1.0f); + ok = a0.is_lock_free(); + a0 = a1.load(); + VERIFY( a0.load() == a1.load() ); + VERIFY( a0.load(mo) == a0.load() ); + a0.store(0.5f); + a1.store(0.5f, mo); + VERIFY( a0.load() == a1.load() ); + auto f0 = a0.exchange(12.5f); + auto f1 = a1.exchange(12.5f, mo); + VERIFY( a0 == 12.5f ); + VERIFY( a0.load() == a1.load() ); + VERIFY( f0 == 0.5f ); + VERIFY( f0 == f1 ); + + expected = 12.5f; + while (!a0.compare_exchange_weak(expected, 1.6f, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == 1.6f ); + VERIFY( expected == 12.5f ); + expected = 1.5f; + ok = a1.compare_exchange_weak(expected, 1.6f, mo, mo); + VERIFY( !ok && a1.load() == 12.5f && expected == 12.5f ); + VERIFY( expected == 12.5f ); + expected = 1.6f; + ok = a0.compare_exchange_strong(expected, 3.2f, mo, mo); + VERIFY( ok && a0.load() == 3.2f ); + VERIFY( expected == 1.6f ); + expected = 1.5f; + ok = a1.compare_exchange_strong(expected, 3.2f, mo, mo); + VERIFY( !ok && a1.load() == 12.5f && expected == 12.5f ); + + expected = 3.2f; + while (!a0.compare_exchange_weak(expected, .64f)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == .64f ); + expected = 12.5f; + while (!a1.compare_exchange_weak(expected, 1.6f, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a1.load() == 1.6f ); + expected = 0.5f; + ok = a0.compare_exchange_weak(expected, 3.2f); + VERIFY( !ok && a0.load() == .64f && expected == .64f ); + expected = 0.5f; + ok = a1.compare_exchange_weak(expected, 3.2f, mo); + VERIFY( !ok && a1.load() == 1.6f && expected == 1.6f ); + + expected = .64f; + ok = a0.compare_exchange_strong(expected, 12.8f); + VERIFY( ok && a0.load() == 12.8f ); + expected = 1.6f; + ok = a1.compare_exchange_strong(expected, 2.56f, mo); + VERIFY( ok && a1.load() == 2.56f ); + expected = 0.5f; + ok = a0.compare_exchange_strong(expected, 3.2f); + VERIFY( !ok && a0.load() == 12.8f && expected == 12.8f ); + expected = 0.5f; + ok = a1.compare_exchange_strong(expected, 3.2f, mo); + VERIFY( !ok && a1.load() == 2.56f && expected == 2.56f ); + + f0 = a0.fetch_add(1.2f); + VERIFY( f0 == 12.8f ); + VERIFY( a0 == 14.0f ); + f1 = a1.fetch_add(2.4f, mo); + VERIFY( f1 == 2.56f ); + VERIFY( a1 == 4.96f ); + + f0 = a0.fetch_sub(1.2f); + VERIFY( f0 == 14.0f ); + VERIFY( a0 == 12.8f ); + f1 = a1.fetch_sub(3.5f, mo); + VERIFY( f1 == 4.96f ); + VERIFY( a1 == 1.46f ); + + f0 = a0 += 1.2f; + VERIFY( f0 == 14.0f ); + VERIFY( a0 == 14.0f ); + + f0 = a0 -= 0.8f; + VERIFY( f0 == 13.2f ); + VERIFY( a0 == 13.2f ); + } +} + +void +test02() +{ + const auto mo = std::memory_order_relaxed; + bool ok; + double expected; + + if constexpr (std::atomic::is_always_lock_free) + { + std::atomic a0; + std::atomic a1(1.0); + ok = a0.is_lock_free(); + a0 = a1.load(); + VERIFY( a0.load() == a1.load() ); + VERIFY( a0.load(mo) == a0.load() ); + a0.store(0.5); + a1.store(0.5, mo); + VERIFY( a0.load() == a1.load() ); + auto f0 = a0.exchange(12.5); + auto f1 = a1.exchange(12.5, mo); + VERIFY( a0 == 12.5 ); + VERIFY( a0.load() == a1.load() ); + VERIFY( f0 == 0.5 ); + VERIFY( f0 == f1 ); + + expected = 12.5; + while (!a0.compare_exchange_weak(expected, 1.6, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == 1.6 ); + VERIFY( expected == 12.5 ); + expected = 1.5; + ok = a1.compare_exchange_weak(expected, 1.6, mo, mo); + VERIFY( !ok && a1.load() == 12.5 && expected == 12.5 ); + VERIFY( expected == 12.5 ); + expected = 1.6; + ok = a0.compare_exchange_strong(expected, 3.2, mo, mo); + VERIFY( ok && a0.load() == 3.2 ); + VERIFY( expected == 1.6 ); + expected = 1.5; + ok = a1.compare_exchange_strong(expected, 3.2, mo, mo); + VERIFY( !ok && a1.load() == 12.5 && expected == 12.5 ); + + expected = 3.2; + while (!a0.compare_exchange_weak(expected, .64)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == .64 ); + expected = 12.5; + while (!a1.compare_exchange_weak(expected, 1.6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a1.load() == 1.6 ); + expected = 0.5; + ok = a0.compare_exchange_weak(expected, 3.2); + VERIFY( !ok && a0.load() == .64 && expected == .64 ); + expected = 0.5; + ok = a1.compare_exchange_weak(expected, 3.2, mo); + VERIFY( !ok && a1.load() == 1.6 && expected == 1.6 ); + + expected = .64; + ok = a0.compare_exchange_strong(expected, 12.8); + VERIFY( ok && a0.load() == 12.8 ); + expected = 1.6; + ok = a1.compare_exchange_strong(expected, 2.56, mo); + VERIFY( ok && a1.load() == 2.56 ); + expected = 0.5; + ok = a0.compare_exchange_strong(expected, 3.2); + VERIFY( !ok && a0.load() == 12.8 && expected == 12.8 ); + expected = 0.5; + ok = a1.compare_exchange_strong(expected, 3.2, mo); + VERIFY( !ok && a1.load() == 2.56 && expected == 2.56 ); + + f0 = a0.fetch_add(1.2); + VERIFY( f0 == 12.8 ); + VERIFY( a0 == 14.0 ); + f1 = a1.fetch_add(2.4, mo); + VERIFY( f1 == 2.56 ); + VERIFY( a1 == 4.96 ); + + f0 = a0.fetch_sub(1.2); + VERIFY( f0 == 14.0 ); + VERIFY( a0 == 12.8 ); + f1 = a1.fetch_sub(3.5, mo); + VERIFY( f1 == 4.96 ); + VERIFY( a1 == 1.46 ); + + f0 = a0 += 1.2; + VERIFY( f0 == 14.0 ); + VERIFY( a0 == 14.0 ); + + f0 = a0 -= 0.8; + VERIFY( f0 == 13.2 ); + VERIFY( a0 == 13.2 ); + } + + // Repeat for volatile std::atomic + if constexpr (std::atomic::is_always_lock_free) + { + volatile std::atomic a0; + volatile std::atomic a1(1.0); + ok = a0.is_lock_free(); + a0 = a1.load(); + VERIFY( a0.load() == a1.load() ); + VERIFY( a0.load(mo) == a0.load() ); + a0.store(0.5); + a1.store(0.5, mo); + VERIFY( a0.load() == a1.load() ); + auto f0 = a0.exchange(12.5); + auto f1 = a1.exchange(12.5, mo); + VERIFY( a0 == 12.5 ); + VERIFY( a0.load() == a1.load() ); + VERIFY( f0 == 0.5 ); + VERIFY( f0 == f1 ); + + expected = 12.5; + while (!a0.compare_exchange_weak(expected, 1.6, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == 1.6 ); + VERIFY( expected == 12.5 ); + expected = 1.5; + ok = a1.compare_exchange_weak(expected, 1.6, mo, mo); + VERIFY( !ok && a1.load() == 12.5 && expected == 12.5 ); + VERIFY( expected == 12.5 ); + expected = 1.6; + ok = a0.compare_exchange_strong(expected, 3.2, mo, mo); + VERIFY( ok && a0.load() == 3.2 ); + VERIFY( expected == 1.6 ); + expected = 1.5; + ok = a1.compare_exchange_strong(expected, 3.2, mo, mo); + VERIFY( !ok && a1.load() == 12.5 && expected == 12.5 ); + + expected = 3.2; + while (!a0.compare_exchange_weak(expected, .64)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == .64 ); + expected = 12.5; + while (!a1.compare_exchange_weak(expected, 1.6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a1.load() == 1.6 ); + expected = 0.5; + ok = a0.compare_exchange_weak(expected, 3.2); + VERIFY( !ok && a0.load() == .64 && expected == .64 ); + expected = 0.5; + ok = a1.compare_exchange_weak(expected, 3.2, mo); + VERIFY( !ok && a1.load() == 1.6 && expected == 1.6 ); + + expected = .64; + ok = a0.compare_exchange_strong(expected, 12.8); + VERIFY( ok && a0.load() == 12.8 ); + expected = 1.6; + ok = a1.compare_exchange_strong(expected, 2.56, mo); + VERIFY( ok && a1.load() == 2.56 ); + expected = 0.5; + ok = a0.compare_exchange_strong(expected, 3.2); + VERIFY( !ok && a0.load() == 12.8 && expected == 12.8 ); + expected = 0.5; + ok = a1.compare_exchange_strong(expected, 3.2, mo); + VERIFY( !ok && a1.load() == 2.56 && expected == 2.56 ); + + f0 = a0.fetch_add(1.2); + VERIFY( f0 == 12.8 ); + VERIFY( a0 == 14.0 ); + f1 = a1.fetch_add(2.4, mo); + VERIFY( f1 == 2.56 ); + VERIFY( a1 == 4.96 ); + + f0 = a0.fetch_sub(1.2); + VERIFY( f0 == 14.0 ); + VERIFY( a0 == 12.8 ); + f1 = a1.fetch_sub(3.5, mo); + VERIFY( f1 == 4.96 ); + VERIFY( a1 == 1.46 ); + + f0 = a0 += 1.2; + VERIFY( f0 == 14.0 ); + VERIFY( a0 == 14.0 ); + + f0 = a0 -= 0.8; + VERIFY( f0 == 13.2 ); + VERIFY( a0 == 13.2 ); + } +} + +void +test03() +{ + const auto mo = std::memory_order_relaxed; + bool ok; + long double expected; + + if constexpr (std::atomic::is_always_lock_free) + { + std::atomic a0; + std::atomic a1(1.0l); + ok = a0.is_lock_free(); + a0 = a1.load(); + VERIFY( a0.load() == a1.load() ); + VERIFY( a0.load(mo) == a0.load() ); + a0.store(0.5l); + a1.store(0.5l, mo); + VERIFY( a0.load() == a1.load() ); + auto f0 = a0.exchange(12.5l); + auto f1 = a1.exchange(12.5l, mo); + VERIFY( a0 == 12.5l ); + VERIFY( a0.load() == a1.load() ); + VERIFY( f0 == 0.5l ); + VERIFY( f0 == f1 ); + + expected = 12.5l; + while (!a0.compare_exchange_weak(expected, 1.6l, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == 1.6l ); + VERIFY( expected == 12.5l ); + expected = 1.5l; + ok = a1.compare_exchange_weak(expected, 1.6l, mo, mo); + VERIFY( !ok && a1.load() == 12.5l && expected == 12.5l ); + VERIFY( expected == 12.5l ); + expected = 1.6l; + ok = a0.compare_exchange_strong(expected, 3.2l, mo, mo); + VERIFY( ok && a0.load() == 3.2l ); + VERIFY( expected == 1.6l ); + expected = 1.5l; + ok = a1.compare_exchange_strong(expected, 3.2l, mo, mo); + VERIFY( !ok && a1.load() == 12.5l && expected == 12.5l ); + + expected = 3.2l; + while (!a0.compare_exchange_weak(expected, .64l)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == .64l ); + expected = 12.5l; + while (!a1.compare_exchange_weak(expected, 1.6l, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a1.load() == 1.6l ); + expected = 0.5l; + ok = a0.compare_exchange_weak(expected, 3.2l); + VERIFY( !ok && a0.load() == .64l && expected == .64l ); + expected = 0.5l; + ok = a1.compare_exchange_weak(expected, 3.2l, mo); + VERIFY( !ok && a1.load() == 1.6l && expected == 1.6l ); + + expected = .64l; + ok = a0.compare_exchange_strong(expected, 12.8l); + VERIFY( ok && a0.load() == 12.8l ); + expected = 1.6l; + ok = a1.compare_exchange_strong(expected, 2.56l, mo); + VERIFY( ok && a1.load() == 2.56l ); + expected = 0.5l; + ok = a0.compare_exchange_strong(expected, 3.2l); + VERIFY( !ok && a0.load() == 12.8l && expected == 12.8l ); + expected = 0.5l; + ok = a1.compare_exchange_strong(expected, 3.2l, mo); + VERIFY( !ok && a1.load() == 2.56l && expected == 2.56l ); + + f0 = a0.fetch_add(1.2l); + VERIFY( f0 == 12.8l ); + VERIFY( a0 == 14.0l ); + f1 = a1.fetch_add(2.4l, mo); + VERIFY( f1 == 2.56l ); + VERIFY( a1 == 4.96l ); + + f0 = a0.fetch_sub(1.2l); + VERIFY( f0 == 14.0l ); + VERIFY( a0 == 12.8l ); + f1 = a1.fetch_sub(3.5l, mo); + VERIFY( f1 == 4.96l ); + VERIFY( a1 == 1.46l ); + + f0 = a0 += 1.2l; + VERIFY( f0 == 14.0l ); + VERIFY( a0 == 14.0l ); + + f0 = a0 -= 0.8l; + VERIFY( f0 == 13.2l ); + VERIFY( a0 == 13.2l ); + } + + // Repeat for volatile std::atomic + if constexpr (std::atomic::is_always_lock_free) + { + volatile std::atomic a0; + volatile std::atomic a1(1.0l); + ok = a0.is_lock_free(); + a0 = a1.load(); + VERIFY( a0.load() == a1.load() ); + VERIFY( a0.load(mo) == a0.load() ); + a0.store(0.5l); + a1.store(0.5l, mo); + VERIFY( a0.load() == a1.load() ); + auto f0 = a0.exchange(12.5l); + auto f1 = a1.exchange(12.5l, mo); + VERIFY( a0 == 12.5l ); + VERIFY( a0.load() == a1.load() ); + VERIFY( f0 == 0.5l ); + VERIFY( f0 == f1 ); + + expected = 12.5l; + while (!a0.compare_exchange_weak(expected, 1.6l, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == 1.6l ); + VERIFY( expected == 12.5l ); + expected = 1.5l; + ok = a1.compare_exchange_weak(expected, 1.6l, mo, mo); + VERIFY( !ok && a1.load() == 12.5l && expected == 12.5l ); + VERIFY( expected == 12.5l ); + expected = 1.6l; + ok = a0.compare_exchange_strong(expected, 3.2l, mo, mo); + VERIFY( ok && a0.load() == 3.2l ); + VERIFY( expected == 1.6l ); + expected = 1.5l; + ok = a1.compare_exchange_strong(expected, 3.2l, mo, mo); + VERIFY( !ok && a1.load() == 12.5l && expected == 12.5l ); + + expected = 3.2l; + while (!a0.compare_exchange_weak(expected, .64l)) + { /* weak form can fail spuriously */ } + VERIFY( a0.load() == .64l ); + expected = 12.5l; + while (!a1.compare_exchange_weak(expected, 1.6l, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a1.load() == 1.6l ); + expected = 0.5l; + ok = a0.compare_exchange_weak(expected, 3.2l); + VERIFY( !ok && a0.load() == .64l && expected == .64l ); + expected = 0.5l; + ok = a1.compare_exchange_weak(expected, 3.2l, mo); + VERIFY( !ok && a1.load() == 1.6l && expected == 1.6l ); + + expected = .64l; + ok = a0.compare_exchange_strong(expected, 12.8l); + VERIFY( ok && a0.load() == 12.8l ); + expected = 1.6l; + ok = a1.compare_exchange_strong(expected, 2.56l, mo); + VERIFY( ok && a1.load() == 2.56l ); + expected = 0.5l; + ok = a0.compare_exchange_strong(expected, 3.2l); + VERIFY( !ok && a0.load() == 12.8l && expected == 12.8l ); + expected = 0.5l; + ok = a1.compare_exchange_strong(expected, 3.2l, mo); + VERIFY( !ok && a1.load() == 2.56l && expected == 2.56l ); + + f0 = a0.fetch_add(1.2l); + VERIFY( f0 == 12.8l ); + VERIFY( a0 == 14.0l ); + f1 = a1.fetch_add(2.4l, mo); + VERIFY( f1 == 2.56l ); + VERIFY( a1 == 4.96l ); + + f0 = a0.fetch_sub(1.2l); + VERIFY( f0 == 14.0l ); + VERIFY( a0 == 12.8l ); + f1 = a1.fetch_sub(3.5l, mo); + VERIFY( f1 == 4.96l ); + VERIFY( a1 == 1.46l ); + + f0 = a0 += 1.2l; + VERIFY( f0 == 14.0l ); + VERIFY( a0 == 14.0l ); + + f0 = a0 -= 0.8l; + VERIFY( f0 == 13.2l ); + VERIFY( a0 == 13.2l ); + } +} + +int +main() +{ + test01(); + test02(); + test03(); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_float/requirements.cc b/libstdc++-v3/testsuite/29_atomics/atomic_float/requirements.cc new file mode 100644 index 00000000000..e52608c451d --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_float/requirements.cc @@ -0,0 +1,69 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do compile { target c++2a } } + +#include + +void +test01() +{ + using A = std::atomic; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_trivially_default_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( std::is_same_v ); + static_assert( !std::is_copy_constructible_v ); + static_assert( !std::is_move_constructible_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); + static_assert( !std::is_assignable_v ); +} + +void +test02() +{ + using A = std::atomic; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_trivially_default_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( std::is_same_v ); + static_assert( !std::is_copy_constructible_v ); + static_assert( !std::is_move_constructible_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); + static_assert( !std::is_assignable_v ); +} + +void +test03() +{ + using A = std::atomic; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_trivially_default_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( std::is_same_v ); + static_assert( !std::is_copy_constructible_v ); + static_assert( !std::is_move_constructible_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); + static_assert( !std::is_assignable_v ); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc new file mode 100644 index 00000000000..231901cc422 --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc @@ -0,0 +1,41 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do compile { target c++2a } } + +#include + +void +test01() +{ + int i = 0; + std::atomic_ref a0(i); + static_assert(std::is_same_v>); + + float f = 1.0f; + std::atomic_ref a1(f); + static_assert(std::is_same_v>); + + int* p = &i; + std::atomic_ref a2(p); + static_assert(std::is_same_v>); + + struct X { } x; + std::atomic_ref a3(x); + static_assert(std::is_same_v>); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/float.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/float.cc new file mode 100644 index 00000000000..0633f28e254 --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/float.cc @@ -0,0 +1,320 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do run { target c++2a } } + +#include +#include + +void +test01() +{ + float value; + if constexpr (std::atomic_ref::is_always_lock_free) + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = 1.6f; + VERIFY( a.load() == 1.6f ); + a.store(0.8f); + VERIFY( a.load(mo) == 0.8f ); + a.store(3.2f, mo); + VERIFY( a.load() == 3.2f ); + auto v = a.exchange(6.4f); + VERIFY( a == 6.4f ); + VERIFY( v == 3.2f ); + v = a.exchange(1.28f, mo); + VERIFY( a == 1.28f ); + VERIFY( v == 6.4f ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, 25.6f, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 25.6f ); + VERIFY( expected == 1.28f ); + expected = 3.2f; + ok = a.compare_exchange_weak(expected, 51.2f, mo, mo); + VERIFY( !ok && a.load() == 25.6f && expected == 25.6f ); + ok = a.compare_exchange_strong(expected, 51.2f, mo, mo); + VERIFY( ok && a.load() == 51.2f && expected == 25.6f ); + expected = 0.0f; + ok = a.compare_exchange_strong(expected, 1.28f, mo, mo); + VERIFY( !ok && a.load() == 51.2f && expected == 51.2f ); + + while (!a.compare_exchange_weak(expected, 25.6f)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 25.6f && expected == 51.2f ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, 10.24f, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 10.24f && expected == 25.6f ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 40.96f); + VERIFY( !ok && a.load() == 10.24f && expected == 10.24f ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 40.96f, mo); + VERIFY( !ok && a.load() == 10.24f && expected == 10.24f ); + + ok = a.compare_exchange_strong(expected, 1.024f); + VERIFY( ok && a.load() == 1.024f && expected == 10.24f ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, 204.8f, mo); + VERIFY( ok && a.load() == 204.8f && expected == 1.024f ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 6.4f); + VERIFY( !ok && a.load() == 204.8f && expected == 204.8f ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 6.4f, mo); + VERIFY( !ok && a.load() == 204.8f && expected == 204.8f ); + + v = a.fetch_add(3.2f); + VERIFY( v == 204.8f ); + VERIFY( a == 208.0f ); + v = a.fetch_add(-8.5f, mo); + VERIFY( v == 208.0f ); + VERIFY( a == 199.5f ); + + v = a.fetch_sub(109.5f); + VERIFY( v == 199.5f ); + VERIFY( a == 90.0f ); + v = a.fetch_sub(2, mo); + VERIFY( v == 90.0f ); + VERIFY( a == 88.0f ); + + v = a += 5.0f; + VERIFY( v == 93.0f ); + VERIFY( a == 93.0f ); + + v = a -= 6.5f; + VERIFY( v == 86.5f ); + VERIFY( a == 86.5f ); + } + + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( value == 86.5f ); +} + +void +test02() +{ + double value; + if constexpr (std::atomic_ref::is_always_lock_free) + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = 1.6; + VERIFY( a.load() == 1.6 ); + a.store(0.8); + VERIFY( a.load(mo) == 0.8 ); + a.store(3.2, mo); + VERIFY( a.load() == 3.2 ); + auto v = a.exchange(6.4); + VERIFY( a == 6.4 ); + VERIFY( v == 3.2 ); + v = a.exchange(1.28, mo); + VERIFY( a == 1.28 ); + VERIFY( v == 6.4 ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, 25.6, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 25.6 ); + VERIFY( expected == 1.28 ); + expected = 3.2; + ok = a.compare_exchange_weak(expected, 51.2, mo, mo); + VERIFY( !ok && a.load() == 25.6 && expected == 25.6 ); + ok = a.compare_exchange_strong(expected, 51.2, mo, mo); + VERIFY( ok && a.load() == 51.2 && expected == 25.6 ); + expected = 0.0; + ok = a.compare_exchange_strong(expected, 1.28, mo, mo); + VERIFY( !ok && a.load() == 51.2 && expected == 51.2 ); + + while (!a.compare_exchange_weak(expected, 25.6)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 25.6 && expected == 51.2 ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, 10.24, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 10.24 && expected == 25.6 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 40.96); + VERIFY( !ok && a.load() == 10.24 && expected == 10.24 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 40.96, mo); + VERIFY( !ok && a.load() == 10.24 && expected == 10.24 ); + + ok = a.compare_exchange_strong(expected, 1.024); + VERIFY( ok && a.load() == 1.024 && expected == 10.24 ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, 204.8, mo); + VERIFY( ok && a.load() == 204.8 && expected == 1.024 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 6.4); + VERIFY( !ok && a.load() == 204.8 && expected == 204.8 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 6.4, mo); + VERIFY( !ok && a.load() == 204.8 && expected == 204.8 ); + + v = a.fetch_add(3.2); + VERIFY( v == 204.8 ); + VERIFY( a == 208.0 ); + v = a.fetch_add(-8.5, mo); + VERIFY( v == 208.0 ); + VERIFY( a == 199.5 ); + + v = a.fetch_sub(109.5); + VERIFY( v == 199.5 ); + VERIFY( a == 90.0 ); + v = a.fetch_sub(2, mo); + VERIFY( v == 90.0 ); + VERIFY( a == 88.0 ); + + v = a += 5.0; + VERIFY( v == 93.0 ); + VERIFY( a == 93.0 ); + + v = a -= 6.5; + VERIFY( v == 86.5 ); + VERIFY( a == 86.5 ); + } + + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( value == 86.5 ); +} + +void +test03() +{ + long double value; + if constexpr (std::atomic_ref::is_always_lock_free) + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = 1.6l; + VERIFY( a.load() == 1.6l ); + a.store(0.8l); + VERIFY( a.load(mo) == 0.8l ); + a.store(3.2l, mo); + VERIFY( a.load() == 3.2l ); + auto v = a.exchange(6.4l); + VERIFY( a == 6.4l ); + VERIFY( v == 3.2l ); + v = a.exchange(1.28l, mo); + VERIFY( a == 1.28l ); + VERIFY( v == 6.4l ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, 25.6l, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 25.6l ); + VERIFY( expected == 1.28l ); + expected = 3.2l; + ok = a.compare_exchange_weak(expected, 51.2l, mo, mo); + VERIFY( !ok && a.load() == 25.6l && expected == 25.6l ); + ok = a.compare_exchange_strong(expected, 51.2l, mo, mo); + VERIFY( ok && a.load() == 51.2l && expected == 25.6l ); + expected = 0.0l; + ok = a.compare_exchange_strong(expected, 1.28l, mo, mo); + VERIFY( !ok && a.load() == 51.2l && expected == 51.2l ); + + while (!a.compare_exchange_weak(expected, 25.6l)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 25.6l && expected == 51.2l ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, 10.24l, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 10.24l && expected == 25.6l ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 40.96l); + VERIFY( !ok && a.load() == 10.24l && expected == 10.24l ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 40.96l, mo); + VERIFY( !ok && a.load() == 10.24l && expected == 10.24l ); + + ok = a.compare_exchange_strong(expected, 1.024l); + VERIFY( ok && a.load() == 1.024l && expected == 10.24l ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, 204.8l, mo); + VERIFY( ok && a.load() == 204.8l && expected == 1.024l ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 6.4l); + VERIFY( !ok && a.load() == 204.8l && expected == 204.8l ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 6.4l, mo); + VERIFY( !ok && a.load() == 204.8l && expected == 204.8l ); + + v = a.fetch_add(3.2l); + VERIFY( v == 204.8l ); + VERIFY( a == 208.0l ); + v = a.fetch_add(-8.5l, mo); + VERIFY( v == 208.0l ); + VERIFY( a == 199.5l ); + + v = a.fetch_sub(109.5l); + VERIFY( v == 199.5l ); + VERIFY( a == 90.0l ); + v = a.fetch_sub(2, mo); + VERIFY( v == 90.0l ); + VERIFY( a == 88.0l ); + + v = a += 5.0l; + VERIFY( v == 93.0l ); + VERIFY( a == 93.0l ); + + v = a -= 6.5l; + VERIFY( v == 86.5l ); + VERIFY( a == 86.5l ); + } + + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( value == 86.5l ); +} + +void +test04() +{ + if constexpr (std::atomic_ref::is_always_lock_free) + { + float i = 0; + float* ptr = 0; + std::atomic_ref a0(ptr); + std::atomic_ref a1(ptr); + std::atomic_ref a2(a0); + a0 = &i; + VERIFY( a1 == &i ); + VERIFY( a2 == &i ); + } +} + +int +main() +{ + test01(); + test02(); + test03(); + test04(); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/generic.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/generic.cc new file mode 100644 index 00000000000..61ae61bb3de --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/generic.cc @@ -0,0 +1,122 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do run { target c++2a } } +// { dg-add-options libatomic } + +#include +#include +#include + +struct X +{ + X() = default; + X(int i) : i(i) { } + bool operator==(int rhs) const { return i == rhs; } + int i; +}; + +void +test01() +{ + X value; + + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = X{}; + VERIFY( a.load() == 0 ); + VERIFY( a.load(mo) == 0 ); + a.store(1); + VERIFY( a.load() == 1 ); + auto v = a.exchange(2); + VERIFY( a.load() == 2 ); + VERIFY( v == 1 ); + v = a.exchange(3, mo); + VERIFY( a.load() == 3 ); + VERIFY( v == 2 ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, 4, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 4 ); + VERIFY( expected == 3 ); + expected = 1; + ok = a.compare_exchange_weak(expected, 5, mo, mo); + VERIFY( !ok && a.load() == 4 && expected == 4 ); + ok = a.compare_exchange_strong(expected, 5, mo, mo); + VERIFY( ok && a.load() == 5 && expected == 4 ); + expected = 0; + ok = a.compare_exchange_strong(expected, 3, mo, mo); + VERIFY( !ok && a.load() == 5 && expected == 5 ); + + while (!a.compare_exchange_weak(expected, 4)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 4 && expected == 5 ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, 6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 6 && expected == 4 ); + expected = a.load(); + expected.i += 1; + ok = a.compare_exchange_weak(expected, -8); + VERIFY( !ok && a.load() == 6 && expected == 6 ); + expected = a.load(); + expected.i += 1; + ok = a.compare_exchange_weak(expected, 8, mo); + VERIFY( !ok && a.load() == 6 && expected == 6 ); + + ok = a.compare_exchange_strong(expected, -6); + VERIFY( ok && a.load() == -6 && expected == 6 ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, 7, mo); + VERIFY( ok && a.load() == 7 && expected == -6 ); + expected = a.load(); + expected.i += 1; + ok = a.compare_exchange_strong(expected, 2); + VERIFY( !ok && a.load() == 7 && expected == 7 ); + expected = a.load(); + expected.i += 1; + ok = a.compare_exchange_strong(expected, 2, mo); + VERIFY( !ok && a.load() == 7 && expected == 7 ); + } + + VERIFY( value == 7 ); +} + +void +test02() +{ + X i; + std::atomic_ref a0(i); + std::atomic_ref a1(i); + std::atomic_ref a2(a0); + a0 = 42; + VERIFY( a1.load() == 42 ); + VERIFY( a2.load() == 42 ); +} + +int +main() +{ + test01(); + test02(); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/integral.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/integral.cc new file mode 100644 index 00000000000..4b5b4d11fd8 --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/integral.cc @@ -0,0 +1,331 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do run { target c++2a } } +// { dg-add-options libatomic } + +#include +#include +#include + +void +test01() +{ + int value; + + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = 0; + VERIFY( a.load() == 0 ); + VERIFY( a.load(mo) == 0 ); + a.store(1); + VERIFY( a.load() == 1 ); + auto v = a.exchange(2); + VERIFY( a == 2 ); + VERIFY( v == 1 ); + v = a.exchange(3, mo); + VERIFY( a == 3 ); + VERIFY( v == 2 ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, 4, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 4 ); + VERIFY( expected == 3 ); + expected = 1; + ok = a.compare_exchange_weak(expected, 5, mo, mo); + VERIFY( !ok && a.load() == 4 && expected == 4 ); + ok = a.compare_exchange_strong(expected, 5, mo, mo); + VERIFY( ok && a.load() == 5 && expected == 4 ); + expected = 0; + ok = a.compare_exchange_strong(expected, 3, mo, mo); + VERIFY( !ok && a.load() == 5 && expected == 5 ); + + while (!a.compare_exchange_weak(expected, 4)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 4 && expected == 5 ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, 6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 6 && expected == 4 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, -8); + VERIFY( !ok && a.load() == 6 && expected == 6 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 8, mo); + VERIFY( !ok && a.load() == 6 && expected == 6 ); + + ok = a.compare_exchange_strong(expected, -6); + VERIFY( ok && a.load() == -6 && expected == 6 ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, 7, mo); + VERIFY( ok && a.load() == 7 && expected == -6 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 2); + VERIFY( !ok && a.load() == 7 && expected == 7 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 2, mo); + VERIFY( !ok && a.load() == 7 && expected == 7 ); + + v = a.fetch_add(2); + VERIFY( v == 7 ); + VERIFY( a == 9 ); + v = a.fetch_add(-30, mo); + VERIFY( v == 9 ); + VERIFY( a == -21 ); + + v = a.fetch_sub(3); + VERIFY( v == -21 ); + VERIFY( a == -24 ); + v = a.fetch_sub(-41, mo); + VERIFY( v == -24 ); + VERIFY( a == 17 ); + + v = a.fetch_and(0x101); + VERIFY( v == 17 ); + VERIFY( a == 1 ); + a = 0x17; + v = a.fetch_and(0x23, mo); + VERIFY( v == 0x17 ); + VERIFY( a == 3 ); + + v = a.fetch_or(0x101); + VERIFY( v == 3 ); + VERIFY( a == 0x103 ); + v = a.fetch_or(0x23, mo); + VERIFY( v == 0x103 ); + VERIFY( a == 0x123 ); + + v = a.fetch_xor(0x101); + VERIFY( v == 0x123 ); + VERIFY( a == 0x022 ); + v = a.fetch_xor(0x123, mo); + VERIFY( v == 0x022 ); + VERIFY( a == 0x101 ); + + v = a++; + VERIFY( v == 0x101 ); + VERIFY( a == 0x102 ); + v = a--; + VERIFY( v == 0x102 ); + VERIFY( a == 0x101 ); + v = ++a; + VERIFY( v == 0x102 ); + VERIFY( a == 0x102 ); + v = --a; + VERIFY( v == 0x101 ); + VERIFY( a == 0x101 ); + + v = a += -10; + VERIFY( v == 247 ); + VERIFY( a == 247 ); + + v = a -= 250; + VERIFY( v == -3 ); + VERIFY( a == -3 ); + + a = 0x17; + v = a &= 0x102; + VERIFY( v == 2 ); + VERIFY( a == 2 ); + + v = a |= 0x101; + VERIFY( v == 0x103 ); + VERIFY( a == 0x103 ); + + v = a ^= 0x121; + VERIFY( v == 0x022 ); + VERIFY( a == 0x022 ); + } + + VERIFY( value == 0x022 ); +} + +void +test02() +{ + unsigned short value; + + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = 0; + VERIFY( a.load() == 0 ); + VERIFY( a.load(mo) == 0 ); + a.store(1); + VERIFY( a.load() == 1 ); + auto v = a.exchange(2); + VERIFY( a == 2 ); + VERIFY( v == 1 ); + v = a.exchange(3, mo); + VERIFY( a == 3 ); + VERIFY( v == 2 ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, 4, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 4 ); + VERIFY( expected == 3 ); + expected = 1; + ok = a.compare_exchange_weak(expected, 5, mo, mo); + VERIFY( !ok && a.load() == 4 && expected == 4 ); + ok = a.compare_exchange_strong(expected, 5, mo, mo); + VERIFY( ok && a.load() == 5 && expected == 4 ); + expected = 0; + ok = a.compare_exchange_strong(expected, 3, mo, mo); + VERIFY( !ok && a.load() == 5 && expected == 5 ); + + while (!a.compare_exchange_weak(expected, 4)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 4 && expected == 5 ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, 6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == 6 && expected == 4 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, -8); + VERIFY( !ok && a.load() == 6 && expected == 6 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, 8, mo); + VERIFY( !ok && a.load() == 6 && expected == 6 ); + + ok = a.compare_exchange_strong(expected, -6); + VERIFY( ok && a.load() == (unsigned short)-6 && expected == 6 ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, 7, mo); + VERIFY( ok && a.load() == 7 && expected == (unsigned short)-6 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 2); + VERIFY( !ok && a.load() == 7 && expected == 7 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, 2, mo); + VERIFY( !ok && a.load() == 7 && expected == 7 ); + + v = a.fetch_add(2); + VERIFY( v == 7 ); + VERIFY( a == 9 ); + v = a.fetch_add(-30, mo); + VERIFY( v == 9 ); + VERIFY( a == (unsigned short)-21 ); + + v = a.fetch_sub(3); + VERIFY( v == (unsigned short)-21 ); + VERIFY( a == (unsigned short)-24 ); + v = a.fetch_sub((unsigned short)-41, mo); + VERIFY( v == (unsigned short)-24 ); + VERIFY( a == 17 ); + + v = a.fetch_and(0x21); + VERIFY( v == 17 ); + VERIFY( a == 1 ); + a = 0x17; + v = a.fetch_and(0x23, mo); + VERIFY( v == 0x17 ); + VERIFY( a == 3 ); + + v = a.fetch_or(0x21); + VERIFY( v == 3 ); + VERIFY( a == 0x23 ); + v = a.fetch_or(0x44, mo); + VERIFY( v == 0x23 ); + VERIFY( a == 0x67 ); + + v = a.fetch_xor(0x21); + VERIFY( v == 0x67 ); + VERIFY( a == 0x46 ); + v = a.fetch_xor(0x12, mo); + VERIFY( v == 0x46 ); + VERIFY( a == 0x54 ); + + v = a++; + VERIFY( v == 0x54 ); + VERIFY( a == 0x55 ); + v = a--; + VERIFY( v == 0x55 ); + VERIFY( a == 0x54 ); + v = ++a; + VERIFY( v == 0x55 ); + VERIFY( a == 0x55 ); + v = --a; + VERIFY( v == 0x54 ); + VERIFY( a == 0x54 ); + + v = a += -10; + VERIFY( v == 0x4a ); + VERIFY( a == 0x4a ); + + v = a -= 15; + VERIFY( v == 0x3b ); + VERIFY( a == 0x3b ); + + a = 0x17; + v = a &= 0x12; + VERIFY( v == 0x12 ); + VERIFY( a == 0x12 ); + + v = a |= 0x34; + VERIFY( v == 0x36 ); + VERIFY( a == 0x36 ); + + v = a ^= 0x12; + VERIFY( v == 0x24 ); + VERIFY( a == 0x24 ); + } + + VERIFY( value == 0x24 ); +} +void +test03() +{ + int i = 0; + std::atomic_ref a0(i); + std::atomic_ref a1(i); + std::atomic_ref a2(a0); + a0 = 42; + VERIFY( a1 == 42 ); + VERIFY( a2 == 42 ); +} + +void +test04() +{ + int i = INT_MIN; + std::atomic_ref a(i); + --a; + VERIFY( a == INT_MAX ); + ++a; + VERIFY( a == INT_MIN ); + a |= INT_MAX; + VERIFY( a == -1 ); +} + +int +main() +{ + test01(); + test02(); + test03(); + test04(); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/pointer.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/pointer.cc new file mode 100644 index 00000000000..d5256d67622 --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/pointer.cc @@ -0,0 +1,225 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do run { target c++2a } } +// { dg-add-options libatomic } + +#include +#include + +void +test01() +{ + long arr[10] = { }; + long* value; + + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = arr; + VERIFY( a.load() == arr ); + VERIFY( a.load(mo) == arr ); + a.store(arr+1); + VERIFY( a.load() == arr+1 ); + auto v = a.exchange(arr+2); + VERIFY( a == arr+2 ); + VERIFY( v == arr+1 ); + v = a.exchange(arr+3, mo); + VERIFY( a == arr+3 ); + VERIFY( v == arr+2 ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, arr+4, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == arr+4 ); + VERIFY( expected == arr+3 ); + expected = arr+1; + ok = a.compare_exchange_weak(expected, arr+5, mo, mo); + VERIFY( !ok && a.load() == arr+4 && expected == arr+4 ); + ok = a.compare_exchange_strong(expected, arr+5, mo, mo); + VERIFY( ok && a.load() == arr+5 && expected == arr+4 ); + expected = nullptr; + ok = a.compare_exchange_strong(expected, arr+3, mo, mo); + VERIFY( !ok && a.load() == arr+5 && expected == arr+5 ); + + while (!a.compare_exchange_weak(expected, arr+4)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == arr+4 && expected == arr+5 ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, arr+6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == arr+6 && expected == arr+4 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, arr+8); + VERIFY( !ok && a.load() == arr+6 && expected == arr+6 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, arr+8, mo); + VERIFY( !ok && a.load() == arr+6 && expected == arr+6 ); + + ok = a.compare_exchange_strong(expected, arr+5); + VERIFY( ok && a.load() == arr+5 && expected == arr+6 ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, arr+7, mo); + VERIFY( ok && a.load() == arr+7 && expected == arr+5 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, arr+2); + VERIFY( !ok && a.load() == arr+7 && expected == arr+7 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, arr+2, mo); + VERIFY( !ok && a.load() == arr+7 && expected == arr+7 ); + + v = a.fetch_add(2); + VERIFY( v == arr+7 ); + VERIFY( a == arr+9 ); + v = a.fetch_add(-3, mo); + VERIFY( v == arr+9 ); + VERIFY( a == arr+6 ); + + v = a.fetch_sub(3); + VERIFY( v == arr+6 ); + VERIFY( a == arr+3 ); + v = a.fetch_sub(2, mo); + VERIFY( v == arr+3 ); + VERIFY( a == arr+1 ); + + v = a += 5; + VERIFY( v == arr+6 ); + VERIFY( a == arr+6 ); + + v = a -= 5; + VERIFY( v == arr+1 ); + VERIFY( a == arr+1 ); + } + + VERIFY( value == arr+1 ); +} + +void +test02() +{ + char arr[10] = { }; + char* value; + + { + const auto mo = std::memory_order_relaxed; + std::atomic_ref a(value); + bool ok = a.is_lock_free(); + if constexpr (std::atomic_ref::is_always_lock_free) + VERIFY( ok ); + a = arr; + VERIFY( a.load() == arr ); + a.store(arr+3); + VERIFY( a.load(mo) == arr+3 ); + a.store(arr+1, mo); + VERIFY( a.load() == arr+1 ); + auto v = a.exchange(arr+2); + VERIFY( a == arr+2 ); + VERIFY( v == arr+1 ); + v = a.exchange(arr+3, mo); + VERIFY( a == arr+3 ); + VERIFY( v == arr+2 ); + + auto expected = a.load(); + while (!a.compare_exchange_weak(expected, arr+4, mo, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == arr+4 ); + VERIFY( expected == arr+3 ); + expected = arr+1; + ok = a.compare_exchange_weak(expected, arr+5, mo, mo); + VERIFY( !ok && a.load() == arr+4 && expected == arr+4 ); + ok = a.compare_exchange_strong(expected, arr+5, mo, mo); + VERIFY( ok && a.load() == arr+5 && expected == arr+4 ); + expected = nullptr; + ok = a.compare_exchange_strong(expected, arr+3, mo, mo); + VERIFY( !ok && a.load() == arr+5 && expected == arr+5 ); + + while (!a.compare_exchange_weak(expected, arr+4)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == arr+4 && expected == arr+5 ); + expected = a.load(); + while (!a.compare_exchange_weak(expected, arr+6, mo)) + { /* weak form can fail spuriously */ } + VERIFY( a.load() == arr+6 && expected == arr+4 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, arr+8); + VERIFY( !ok && a.load() == arr+6 && expected == arr+6 ); + expected = a.load() + 1; + ok = a.compare_exchange_weak(expected, arr+8, mo); + VERIFY( !ok && a.load() == arr+6 && expected == arr+6 ); + + ok = a.compare_exchange_strong(expected, arr+5); + VERIFY( ok && a.load() == arr+5 && expected == arr+6 ); + expected = a.load(); + ok = a.compare_exchange_strong(expected, arr+7, mo); + VERIFY( ok && a.load() == arr+7 && expected == arr+5 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, arr+2); + VERIFY( !ok && a.load() == arr+7 && expected == arr+7 ); + expected = a.load() + 1; + ok = a.compare_exchange_strong(expected, arr+2, mo); + VERIFY( !ok && a.load() == arr+7 && expected == arr+7 ); + + v = a.fetch_add(2); + VERIFY( v == arr+7 ); + VERIFY( a == arr+9 ); + v = a.fetch_add(-3, mo); + VERIFY( v == arr+9 ); + VERIFY( a == arr+6 ); + + v = a.fetch_sub(3); + VERIFY( v == arr+6 ); + VERIFY( a == arr+3 ); + v = a.fetch_sub(2, mo); + VERIFY( v == arr+3 ); + VERIFY( a == arr+1 ); + + v = a += 5; + VERIFY( v == arr+6 ); + VERIFY( a == arr+6 ); + + v = a -= 5; + VERIFY( v == arr+1 ); + VERIFY( a == arr+1 ); + } + + VERIFY( value == arr+1 ); +} + +void +test03() +{ + int i = 0; + int* ptr = 0; + std::atomic_ref a0(ptr); + std::atomic_ref a1(ptr); + std::atomic_ref a2(a0); + a0 = &i; + VERIFY( a1 == &i ); + VERIFY( a2 == &i ); +} + +int +main() +{ + test01(); + test02(); + test03(); +} diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements.cc new file mode 100644 index 00000000000..a3fd4505d0f --- /dev/null +++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements.cc @@ -0,0 +1,74 @@ +// Copyright (C) 2019 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 +// . + +// { dg-options "-std=gnu++2a" } +// { dg-do compile { target c++2a } } + +#include + +void +test01() +{ + struct X { int c; }; + using A = std::atomic_ref; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_nothrow_copy_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); +} + +void +test02() +{ + using A = std::atomic_ref; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_nothrow_copy_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( std::is_same_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); +} + +void +test03() +{ + using A = std::atomic_ref; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_nothrow_copy_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( std::is_same_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); +} + +void +test04() +{ + using A = std::atomic_ref; + static_assert( std::is_standard_layout_v ); + static_assert( std::is_nothrow_copy_constructible_v ); + static_assert( std::is_trivially_destructible_v ); + static_assert( std::is_same_v ); + static_assert( std::is_same_v ); + static_assert( std::is_nothrow_copy_constructible_v ); + static_assert( !std::is_copy_assignable_v ); + static_assert( !std::is_move_assignable_v ); +}