The GNU C++ Library

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Chapter 1. Status
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Chapter 1. Status

Part I. Introduction -

Implementation Status

C++ 1998/2003

Implementation Status

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Chapter 1. Status

Implementation Status

C++ 1998/2003

Implementation Status

This status table is based on the table of contents of ISO/IEC 14882:2003.

This section describes the C++ support in mainline GCC, not in any @@ -983,7 +983,11 @@ since C++14 and the implementation is complete. N4531 - std::rand replacement, revision 3YLibrary Fundamentals 2 TS

Implementation Specific Behavior

For behaviour which is also specified by previous standards, + std::rand replacement, revision 3YLibrary Fundamentals 2 TS + + P0214R9 + + Data-Parallel TypesYParallelism 2 TS

Implementation Specific Behavior

For behaviour which is also specified by previous standards, see C++ 1998/2003 Implementation Specific Behavior and C++ 2011 Implementation Specific Behavior. This section only @@ -1083,7 +1087,113 @@ since C++14 and the implementation is complete.

30.10.15.4 [fs.op.file_size] If !is_regular_file(p), an error is reported. -

C++ 2020

Parallelism 2 TS

+ 9.3 [parallel.simd.abi] + max_fixed_size<T> is 32, except when targetting + AVX512BW and sizeof(T) is 1. +

+ When targeting 32-bit x86, + simd_abi::compatible<T> is an alias for + simd_abi::scalar. + When targeting 64-bit x86 (including x32) or Aarch64, + simd_abi::compatible<T> is an alias for + simd_abi::_VecBuiltin<16>, + unless T is long double, in which case it is + an alias for simd_abi::scalar. + When targeting ARM (but not Aarch64) with NEON support, + simd_abi::compatible<T> is an alias for + simd_abi::_VecBuiltin<16>, + unless sizeof(T) > 4, in which case it is + an alias for simd_abi::scalar. Additionally, + simd_abi::compatible<float> is an alias for + simd_abi::scalar unless compiling with + -ffast-math. +

+ When targeting x86 (both 32-bit and 64-bit), + simd_abi::native<T> is an alias for one of + simd_abi::scalar, + simd_abi::_VecBuiltin<16>, + simd_abi::_VecBuiltin<32>, or + simd_abi::_VecBltnBtmsk<64>, depending on + T and the machine options the compiler was invoked with. +

+ When targeting ARM/Aarch64 or POWER, + simd_abi::native<T> is an alias for + simd_abi::scalar or + simd_abi::_VecBuiltin<16>, depending on + T and the machine options the compiler was invoked with. +

+ For any other targeted machine + simd_abi::compatible<T> and + simd_abi::native<T> are aliases for + simd_abi::scalar. (subject to change) +

+ The extended ABI tag types defined in the + std::experimental::parallelism_v2::simd_abi namespace are: + simd_abi::_VecBuiltin<Bytes>, and + simd_abi::_VecBltnBtmsk<Bytes>. +

+ simd_abi::deduce<T, N, Abis...>::type, + with N > 1 is an alias for an extended ABI tag, if a + supported extended ABI tag exists. Otherwise it is an alias for + simd_abi::fixed_size<N>. The + simd_abi::_VecBltnBtmsk ABI tag is preferred over + simd_abi::_VecBuiltin. +

+ 9.4 [parallel.simd.traits] + memory_alignment<T, U>::value is + sizeof(U) * T::size() rounded up to the next power-of-two + value. +

+ 9.6.1 [parallel.simd.overview] + On ARM, simd<T, _VecBuiltin<Bytes>> + is supported if __ARM_NEON is defined and + sizeof(T) <= 4. Additionally, + sizeof(T) == 8 with integral T is supported if + __ARM_ARCH >= 8, and double is supported if + __aarch64__ is defined. + + On POWER, simd<T, _VecBuiltin<Bytes>> + is supported if __ALTIVEC__ is defined and sizeof(T) + < 8. Additionally, double is supported if + __VSX__ is defined, and any T with + sizeof(T) <= 8 is supported if __POWER8_VECTOR__ + is defined. + + On x86, given an extended ABI tag Abi, + simd<T, Abi> is supported according to the + following table: +

Table 1.8. Support for Extended ABI Tags

ABI tag `Abi`	value type `T`	values for `Bytes`	required machine option
+ `_VecBuiltin<Bytes>` +	`float`	8, 12, 16	"-msse"
	`float`	20, 24, 28, 32	"-mavx"
	`double`	16	"-msse2"
	`double`	24, 32	"-mavx"
	+ integral types other than `bool` +	+ `Bytes` ≤ 16 and `Bytes` divisible by + `sizeof(T)` +	"-msse2"
	+ integral types other than `bool` +	+ 16 < `Bytes` ≤ 32 and `Bytes` + divisible by `sizeof(T)` +	"-mavx2"
+ `_VecBuiltin<Bytes>` and + `_VecBltnBtmsk<Bytes>` +	+ vectorizable types with `sizeof(T)` ≥ 4 +	+ 32 < `Bytes` ≤ 64 and `Bytes` + divisible by `sizeof(T)` +	"-mavx512f"
+ `_VecBuiltin<Bytes>` and + `_VecBltnBtmsk<Bytes>` +	+ vectorizable types with `sizeof(T)` < 4 +		"-mavx512bw"
+ `_VecBltnBtmsk<Bytes>` +	+ vectorizable types with `sizeof(T)` ≥ 4 +	+ `Bytes` ≤ 32 and `Bytes` divisible by + `sizeof(T)` +	"-mavx512vl"
+ `_VecBltnBtmsk<Bytes>` +	+ vectorizable types with `sizeof(T)` < 4 +	+ `Bytes` ≤ 32 and `Bytes` divisible by + `sizeof(T)` +	"-mavx512bw" and "-mavx512vl"

C++ 2020

In this implementation the -std=gnu++2a or -std=c++2a flag must be used to enable language and library @@ -1106,7 +1216,7 @@ The "SD-6 Feature Test / Notes" column shows the corresponding macro or header f SD-6: Feature-testing recommendations for C++ (where applicable) or any notes about the implementation. -

Table 1.8. C++ 2020 Library Features

Library Feature Proposal Status SD-6 Feature Test / Notes

Table 1.9. C++ 2020 Library Features

Library Feature Proposal Status SD-6 Feature Test / Notes

Compile-time programming

Add constexpr modifiers to functions in <algorithm> and <utility> Headers

@@ -1551,7 +1661,7 @@ In this implementation the header names are prefixed by

This page describes the TR1 support in mainline GCC, not in any particular release. -

Table 1.9. C++ TR1 Implementation Status

Section Description Status Comments

2 General Utilities

2.1 Reference wrappers

2.1.1 Additions to header <functional> synopsis Y

2.1.2 Class template reference_wrapper

2.1.2.1 reference_wrapper construct/copy/destroy Y

2.1.2.2 reference_wrapper assignment Y

2.1.2.3 reference_wrapper access Y

2.1.2.4 reference_wrapper invocation Y

2.1.2.5 reference_wrapper helper functions Y

2.2 Smart pointers

2.2.1 Additions to header <memory> synopsis Y

2.2.2 Class bad_weak_ptr Y

2.2.3

Class template shared_ptr

Table 1.10. C++ TR1 Implementation Status

Section Description Status Comments

2 General Utilities

2.1 Reference wrappers

2.1.1 Additions to header <functional> synopsis Y

2.1.2 Class template reference_wrapper

2.1.2.1 reference_wrapper construct/copy/destroy Y

2.1.2.2 reference_wrapper assignment Y

2.1.2.3 reference_wrapper access Y

2.1.2.4 reference_wrapper invocation Y

2.1.2.5 reference_wrapper helper functions Y

2.2 Smart pointers

2.2.1 Additions to header <memory> synopsis Y

2.2.2 Class bad_weak_ptr Y

2.2.3

Class template shared_ptr

Uses code from boost::shared_ptr. @@ -1572,7 +1682,7 @@ decimal floating-point arithmetic

This page describes the TR 24733 support in mainline GCC, not in any particular release. -

Table 1.10. C++ TR 24733 Implementation Status

Section Description Status Comments

Table 1.11. C++ TR 24733 Implementation Status

Section Description Status Comments

Introduction @@ -1612,7 +1722,7 @@ non-strict modes (i.e. -std=gnu++NN modes) the hypergeometric functions and confluent hypergeometric functions from TR1 are also provided, defined in namespace __gnu_cxx. -

Table 1.11. C++ Special Functions Implementation Status

Section Description Status Comments

Macro names

Partial

No diagnostic for inconsistent definitions of +

Table 1.12. C++ Special Functions Implementation Status

Section	Description	Status	Comments
7	Macro names	Partial	No diagnostic for inconsistent definitions of `__STDCPP_WANT_MATH_SPEC_FUNCS__`
8	Mathematical special functions	Y
8.1	Additions to header `<cmath>` synopsis	Y
8.1.1	associated Laguerre polynomials	Y
8.1.2	associated Legendre functions	Y
8.1.3	beta function	Y
8.1.4	(complete) elliptic integral of the first kind	Y
8.1.5	(complete) elliptic integral of the second kind	Y
8.1.6	(complete) elliptic integral of the third kind	Y
8.1.7	regular modified cylindrical Bessel functions	Y
8.1.8	cylindrical Bessel functions (of the first kind)	Y
8.1.9	irregular modified cylindrical Bessel functions	Y
8.1.10	cylindrical Neumann functions	Y
8.1.11	(incomplete) elliptic integral of the first kind	Y
8.1.12	(incomplete) elliptic integral of the second kind	Y
8.1.13	(incomplete) elliptic integral of the third kind	Y
8.1.14	exponential integral	Y
8.1.15	Hermite polynomials	Y
8.1.16	Laguerre polynomials	Y
8.1.17	Legendre polynomials	Y
8.1.18	Riemann zeta function	Y
8.1.19	spherical Bessel functions (of the first kind)	Y
8.1.20	spherical associated Legendre functions	Y
8.1.21	spherical Neumann functions	Y
8.2	Additions to header `<math.h>`	Y
8.3	The header `<ctgmath>`	Partial	Conflicts with C++ 2011 requirements.
8.4	The header `<tgmath.h>`	N	Conflicts with C++ 2011 requirements.

Implementation Specific Behavior

For behaviour which is specified by the 2011 standard, see C++ 2011 Implementation Specific Behavior. This section documents behaviour which diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml index bc740f8e1ba..f97fc060fa0 100644 --- a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml +++ b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml @@ -3113,7 +3113,7 @@ since C++14 and the implementation is complete. is supported if __ALTIVEC__ is defined and sizeof(T) < 8. Additionally, double is supported if __VSX__ is defined, and any T with - sizeof(T) ≤ 8 is supported if __POWER8_VECTOR__ + sizeof(T) <= 8 is supported if __POWER8_VECTOR__ is defined. On x86, given an extended ABI tag Abi,