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libstdc++: Support std::abs for 128-bit integers and floats [PR96710]

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Currently we only provide std::abs(__int128) and std::abs(__float128)
for non-strict modes, i.e. -std=gnu++NN but not -std=c++NN.

This defines those overloads for strict modes too, as a small step
towards resolving PR 96710 (which will eventually mean that __int128
satisfies the std::integral concept).

libstdc++-v3/ChangeLog:

	PR libstdc++/96710
	* include/bits/std_abs.h [__SIZEOF_INT128__] (abs(__int128)):
	Define.
	[_GLIBCXX_USE_FLOAT128] (abs(__float128)): Enable definition for
	strict modes.
	* testsuite/26_numerics/headers/cmath/82644.cc: Use strict_std
	instead of defining __STRICT_ANSI__.
	* testsuite/26_numerics/headers/cstdlib/abs128.cc: New test.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
This commit is contained in:
Jonathan Wakely
2025-05-16 13:05:51 +01:00
committed by Jonathan Wakely
parent 351e60095c
commit e0c3066c14
3 changed files with 26 additions and 2 deletions
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9
libstdc++-v3/include/bits/std_abs.h
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@@ -103,6 +103,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; }
#endif
#if defined __STRICT_ANSI__ && defined __SIZEOF_INT128__
// In strict modes __GLIBCXX_TYPE_INT_N_0 is not defined for __int128,
// but we want to always define std::abs(__int128).
__extension__ inline _GLIBCXX_CONSTEXPR __int128
abs(__int128 __x) { return __x >= 0 ? __x : -__x; }
#endif
#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
constexpr _Float16
abs(_Float16 __x)
@@ -137,7 +144,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return __gnu_cxx::__bfloat16_t(__builtin_fabsf(__x)); }
#endif
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
#if defined(_GLIBCXX_USE_FLOAT128)
__extension__ inline _GLIBCXX_CONSTEXPR
__float128
abs(__float128 __x)

3
libstdc++-v3/testsuite/26_numerics/headers/cmath/82644.cc
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@@ -15,8 +15,9 @@
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__ -D__STRICT_ANSI__" }
// { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
// { dg-do compile { target c++11 } }
// // { dg-add-options strict_std }
#define conf_hyperg 1
#define conf_hypergf 2

16
libstdc++-v3/testsuite/26_numerics/headers/cstdlib/abs128.cc Normal file
View File

@@ -0,0 +1,16 @@
// { dg-do compile }
// { dg-add-options strict_std }
#include <cstdlib>
template<typename T> T same_type(T, T) { return T(); }
#ifdef __SIZEOF_INT128__
__int128 i = 0;
__int128 j = same_type(std::abs(i), i);
#endif
#ifdef __SIZEOF_FLOAT128__
__float128 f = 0.0;
__float128 g = same_type(std::abs(f), f);
#endif