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099d469df67d8454aa393d036f4791912364bd4d
gcc/libstdc++-v3/include/bits
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Jonathan Wakely 099d469df6 libstdc++: Fix std::abs(__float128) for -NaN and -0.0 [PR109758] 
The current implementation of this non-standard overload of std::abs
incorrectly returns a negative value for negative NaNs and negative
zero, because x < 0 is false in both cases.

Use fabsl(long double) or fabsf128(_Float128) if those do the right
thing.  Otherwise, use __builtin_signbit(x) instead of x < 0 to detect
negative inputs. This assumes that __builtin_signbit handles __float128
correctly, but that seems to be true for all of GCC, clang and icc.

libstdc++-v3/ChangeLog:

	PR libstdc++/109758
	* include/bits/std_abs.h (abs(__float128)): Handle negative NaN
	and negative zero correctly.
	* testsuite/26_numerics/headers/cmath/109758.cc: New test.

(cherry picked from commit af595613acbd9863198ae69c7b1c9e856bca9e4f)
2023-06-01 18:11:08 +01:00
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algorithmfwd.h
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align.h
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alloc_traits.h
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allocated_ptr.h
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allocator.h
libstdc++: Fix typo in comment
2023-03-13 10:32:26 +00:00
atomic_base.h
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atomic_futex.h
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atomic_timed_wait.h
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atomic_wait.h
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basic_ios.h
libstdc++: Add Doxygen comment for string::resize_and_overwite
2023-02-27 13:42:21 +00:00
basic_ios.tcc
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basic_string.h
libstdc++: Backport std::basic_string::_S_allocate from trunk
2023-05-11 21:30:00 +01:00
basic_string.tcc
libstdc++: Backport std::basic_string::_S_allocate from trunk
2023-05-11 21:30:00 +01:00
boost_concept_check.h
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c++0x_warning.h
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c++config
libstdc++: Downgrade DEBUG to ASSERTIONS when !HOSTED
2023-04-05 18:45:14 +02:00
char_traits.h
libstdc++: More fixes for null pointers used with std::char_traits
2023-03-28 21:12:18 +01:00
charconv.h
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chrono_io.h
libstdc++: Fix ostream insertion operators for calendar types
2023-01-14 16:59:58 +00:00
chrono.h
libstdc++: Fix preprocessor condition for inline variables
2023-03-14 10:28:38 +00:00
codecvt.h
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concept_check.h
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cow_string.h
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cpp_type_traits.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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forward_list.h
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forward_list.tcc
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fs_dir.h
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fs_fwd.h
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fs_ops.h
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fs_path.h
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fstream.tcc
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functexcept.h
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functional_hash.h
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gslice_array.h
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gslice.h
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hashtable_policy.h
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hashtable.h
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indirect_array.h
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invoke.h
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ios_base.h
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istream.tcc
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iterator_concepts.h
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list.tcc
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locale_classes.h
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locale_classes.tcc
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locale_conv.h
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locale_facets_nonio.h
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locale_facets.h
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locale_facets.tcc
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localefwd.h
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mask_array.h
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max_size_type.h
libstdc++: Fix __max_diff_type::operator>>= for negative values
2023-04-28 18:21:17 -04:00
memory_resource.h
libstdc++: Improve doxygen docs for <memory_resource>
2023-04-28 13:31:53 +01:00
memoryfwd.h
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mofunc_impl.h
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move_only_function.h
libstdc++: Make std::move_only_function never valueless in std::variant
2022-06-27 11:08:16 +01:00
move.h
libstdc++: Simplify preprocessor/namespace nesting in <bits/move.h>
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new_allocator.h
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node_handle.h
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ostream_insert.h
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ostream.tcc
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parse_numbers.h
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postypes.h
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predefined_ops.h
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ptr_traits.h
libstdc++: Harmonize <version> and other headers
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quoted_string.h
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random.h
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random.tcc
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range_access.h
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ranges_algo.h
libstdc++: Adding missing feature-test macros for C++23 ranges algos
2023-04-18 07:24:19 -04:00
ranges_algobase.h
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ranges_base.h
libstdc++: Implement P2278R4 "cbegin should always return a constant iterator"
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ranges_cmp.h
libstdc++: Implement range_adaptor_closure from P2387R3 [PR108827]
2023-04-18 07:24:21 -04:00
ranges_uninitialized.h
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ranges_util.h
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refwrap.h
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regex_automaton.h
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regex_automaton.tcc
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regex_compiler.h
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regex_compiler.tcc
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regex_constants.h
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regex_error.h
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regex_executor.h
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regex_executor.tcc
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regex_scanner.h
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regex_scanner.tcc
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2023-02-16 10:24:45 +00:00
regex.h
libstdc++: Define std::sub_match::swap member function (LWG 3204)
2023-04-05 11:37:19 +01:00
regex.tcc
libstdc++: Minor fixes to doxygen comments
2023-04-28 13:33:29 +01:00
requires_hosted.h
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2022-10-03 15:43:48 +01:00
semaphore_base.h
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shared_ptr_atomic.h
libstdc++: Fix assigning nullptr to std::atomic<shared_ptr<T>> (LWG 3893)
2023-03-22 23:13:40 +00:00
shared_ptr_base.h
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shared_ptr.h
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slice_array.h
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specfun.h
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sstream.tcc
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std_abs.h
libstdc++: Fix std::abs(__float128) for -NaN and -0.0 [PR109758]
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std_function.h
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std_mutex.h
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std_thread.h
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stl_algo.h
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stl_algobase.h
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stl_bvector.h
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stl_construct.h
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stl_deque.h
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stl_function.h
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stl_heap.h
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stl_iterator_base_funcs.h
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stl_iterator_base_types.h
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stl_iterator.h
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stl_list.h
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stl_map.h
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stl_multimap.h
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stl_multiset.h
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stl_numeric.h
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stl_pair.h
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stl_queue.h
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stl_raw_storage_iter.h
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stl_relops.h
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stl_set.h
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stl_stack.h
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stl_tempbuf.h
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stl_tree.h
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2023-01-26 13:38:22 +00:00
stl_uninitialized.h
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stl_vector.h
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stream_iterator.h
libstdc++: Make std::istream_iterator copy ctor constexpr (LWG 3600)
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streambuf_iterator.h
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streambuf.tcc
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string_view.tcc
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stringfwd.h
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this_thread_sleep.h
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uniform_int_dist.h
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2023-04-28 13:33:31 +01:00
unique_lock.h
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unique_ptr.h
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2023-04-05 18:45:14 +02:00
unordered_map.h
libstdc++: Add @headerfile and @since to doxygen comments [PR40380]
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unordered_set.h
libstdc++: Add @headerfile and @since to doxygen comments [PR40380]
2023-04-28 13:31:52 +01:00
uses_allocator_args.h
libstdc++: Fix uses_allocator_construction_args for pair<T&&, U&&> [PR108952]
2023-02-28 09:49:11 +00:00
uses_allocator.h
libstdc++: Minor fixes to doxygen comments
2023-04-28 13:33:29 +01:00
utility.h
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valarray_after.h
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valarray_array.h
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valarray_array.tcc
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valarray_before.h
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vector.tcc
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