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68a1218c189cce1eea2f3b035848984aa2ee8a5b
gcc/libstdc++-v3/include/bits
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Soumya AR 68a1218c18 libstdc++: Implement std::atomic::fetch_min/max 
This patch extends libstdc++ to implement C++26's atomic fetch min/max
operations.

The __atomic_fetch_minmaxable concept checks if __atomic_fetch_min and
__atomic_fetch_max builtins are implemented by the compiler. If not, fall back
to a CAS loop.

This patch was bootstrapped and regtested on aarch64-linux-gnu and
x86_64-linux-gnu, no regression.

Signed-off-by: Soumya AR <soumyaa@nvidia.com>

libstdc++-v3/ChangeLog:

	* include/bits/atomic_base.h:
	Add fetch_min and fetch_max memberfunctions.
	* include/bits/version.def:
	Add __cpp_lib_atomic_min_max feature test macro.
	* include/bits/version.h (defined): Regenerate.
	* include/std/atomic: Extend for fetch_min/max non-member functions.
	* src/c++23/std.cc.in: Export atomic_fetch_min, atomic_fetch_max,
	atomic_fetch_min_explicit, atomic_fetch_max_explicit.
	* testsuite/29_atomics/atomic_integral/nonmembers_fetch_minmax.cc:
	New test.
	* testsuite/29_atomics/atomic_ref/integral_fetch_minmax.cc: New test.
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algorithmfwd.h
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align.h
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allocated_ptr.h
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allocator.h
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atomic_base.h
libstdc++: Implement std::atomic::fetch_min/max
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atomic_futex.h
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atomic_timed_wait.h
libstdc++: Fix proxy wait detection in atomic wait
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atomic_wait.h
libstdc++: Improve comments on __wait_args::_M_setup_proxy_wait
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basic_ios.h
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basic_string.tcc
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binders.h
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boost_concept_check.h
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c++0x_warning.h
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c++config
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chrono_io.h
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cpp_type_traits.h
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cpyfunc_impl.h
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deque.tcc
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enable_special_members.h
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erase_if.h
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formatfwd.h
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funcref_impl.h
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funcwrap.h
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indirect.h
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iterator_concepts.h
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requires_hosted.h
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sat_arith.h
libstdc++: Extend __is_standard_integer to cover extended integer types
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semaphore_base.h
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shared_ptr_atomic.h
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stl_heap.h
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text_encoding-data.h
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unicode-data.h
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unicode.h
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version.def
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version.h
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version.tpl
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