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from 1323f7264aa i386: Add AVX512 unaligned intrinsics new 6d63be46972 Define std::atomic_ref and std::atomic<floating-point> for C++20 new 6a7d6b5ea11 Improve docs for --enable-libstdcxx-time=rt

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Summary of changes: libstdc++-v3/ChangeLog | 24 + libstdc++-v3/doc/xml/manual/configure.xml | 20 +- libstdc++-v3/include/bits/atomic_base.h | 871 +++++++++++++++++++++ libstdc++-v3/include/std/atomic | 66 +- libstdc++-v3/include/std/version | 1 + libstdc++-v3/testsuite/29_atomics/atomic/60695.cc | 2 +- .../testsuite/29_atomics/atomic_float/1.cc | 573 ++++++++++++++ .../29_atomics/atomic_float/requirements.cc | 69 ++ .../atomic_ref/deduction.cc} | 34 +- .../testsuite/29_atomics/atomic_ref/float.cc | 320 ++++++++ .../testsuite/29_atomics/atomic_ref/generic.cc | 122 +++ .../testsuite/29_atomics/atomic_ref/integral.cc | 331 ++++++++ .../testsuite/29_atomics/atomic_ref/pointer.cc | 225 ++++++ .../29_atomics/atomic_ref/requirements.cc | 74 ++ 14 files changed, 2704 insertions(+), 28 deletions(-) create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_float/1.cc create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_float/requirements.cc copy libstdc++-v3/testsuite/{20_util/variant/visit_neg.cc => 29_atomics/atomic_ref [...] create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/float.cc create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/generic.cc create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/integral.cc create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/pointer.cc create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements.cc