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* [gcc r13-4171] libstdc++: Add always_inline to trivial range access functions
@ 2022-11-19 17:44 Jonathan Wakely
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From: Jonathan Wakely @ 2022-11-19 17:44 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:0723ad39020e5b5e90f40ac0673ab34be7c5b4e0
commit r13-4171-g0723ad39020e5b5e90f40ac0673ab34be7c5b4e0
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Nov 17 10:21:54 2022 +0000
libstdc++: Add always_inline to trivial range access functions
This makes all the [iterator.range] functions always-inline, except the
ones that construct a std::reverse_iterator, as they do a little more
work. They could probably be made always_inline too though, and maybe
the std::reverse_iterator constructor too.
This means that even for -O0 these functions have no runtime overhead
compared with calling a member of the container, or performing pointer
arithmetic for arrays.
libstdc++-v3/ChangeLog:
* include/bits/range_access.h: Add always_inline attribute to
trivial functions.
Diff:
---
libstdc++-v3/include/bits/range_access.h | 53 +++++++++++++++++---------------
1 file changed, 28 insertions(+), 25 deletions(-)
diff --git a/libstdc++-v3/include/bits/range_access.h b/libstdc++-v3/include/bits/range_access.h
index 78fdfe66035..241f5417eec 100644
--- a/libstdc++-v3/include/bits/range_access.h
+++ b/libstdc++-v3/include/bits/range_access.h
@@ -47,7 +47,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
begin(_Container& __cont) -> decltype(__cont.begin())
{ return __cont.begin(); }
@@ -58,7 +58,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
begin(const _Container& __cont) -> decltype(__cont.begin())
{ return __cont.begin(); }
@@ -69,7 +69,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
end(_Container& __cont) -> decltype(__cont.end())
{ return __cont.end(); }
@@ -80,7 +80,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
end(const _Container& __cont) -> decltype(__cont.end())
{ return __cont.end(); }
@@ -90,7 +90,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __arr Array.
*/
template<typename _Tp, size_t _Nm>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX14_CONSTEXPR _Tp*
begin(_Tp (&__arr)[_Nm]) noexcept
{ return __arr; }
@@ -101,7 +101,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __arr Array.
*/
template<typename _Tp, size_t _Nm>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX14_CONSTEXPR _Tp*
end(_Tp (&__arr)[_Nm]) noexcept
{ return __arr + _Nm; }
@@ -121,7 +121,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
constexpr auto
cbegin(const _Container& __cont) noexcept(noexcept(std::begin(__cont)))
-> decltype(std::begin(__cont))
@@ -133,7 +133,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
constexpr auto
cend(const _Container& __cont) noexcept(noexcept(std::end(__cont)))
-> decltype(std::end(__cont))
@@ -145,7 +145,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
rbegin(_Container& __cont) -> decltype(__cont.rbegin())
{ return __cont.rbegin(); }
@@ -156,7 +156,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
rbegin(const _Container& __cont) -> decltype(__cont.rbegin())
{ return __cont.rbegin(); }
@@ -167,7 +167,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
rend(_Container& __cont) -> decltype(__cont.rend())
{ return __cont.rend(); }
@@ -178,7 +178,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
rend(const _Container& __cont) -> decltype(__cont.rend())
{ return __cont.rend(); }
@@ -233,7 +233,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
crbegin(const _Container& __cont) -> decltype(std::rbegin(__cont))
{ return std::rbegin(__cont); }
@@ -244,7 +244,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template<typename _Container>
- [[__nodiscard__]]
+ [[__nodiscard__, __gnu__::__always_inline__]]
inline _GLIBCXX17_CONSTEXPR auto
crend(const _Container& __cont) -> decltype(std::rend(__cont))
{ return std::rend(__cont); }
@@ -259,7 +259,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template <typename _Container>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr auto
size(const _Container& __cont) noexcept(noexcept(__cont.size()))
-> decltype(__cont.size())
@@ -269,7 +269,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @brief Return the size of an array.
*/
template <typename _Tp, size_t _Nm>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr size_t
size(const _Tp (&)[_Nm]) noexcept
{ return _Nm; }
@@ -279,7 +279,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template <typename _Container>
- [[nodiscard]] constexpr auto
+ [[nodiscard, __gnu__::__always_inline__]]
+ constexpr auto
empty(const _Container& __cont) noexcept(noexcept(__cont.empty()))
-> decltype(__cont.empty())
{ return __cont.empty(); }
@@ -288,7 +289,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @brief Return whether an array is empty (always false).
*/
template <typename _Tp, size_t _Nm>
- [[nodiscard]] constexpr bool
+ [[nodiscard, __gnu__::__always_inline__]]
+ constexpr bool
empty(const _Tp (&)[_Nm]) noexcept
{ return false; }
@@ -297,7 +299,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __il Initializer list.
*/
template <typename _Tp>
- [[nodiscard]] constexpr bool
+ [[nodiscard, __gnu__::__always_inline__]]
+ constexpr bool
empty(initializer_list<_Tp> __il) noexcept
{ return __il.size() == 0;}
@@ -306,7 +309,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template <typename _Container>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr auto
data(_Container& __cont) noexcept(noexcept(__cont.data()))
-> decltype(__cont.data())
@@ -317,7 +320,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __cont Container.
*/
template <typename _Container>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr auto
data(const _Container& __cont) noexcept(noexcept(__cont.data()))
-> decltype(__cont.data())
@@ -328,7 +331,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __array Array.
*/
template <typename _Tp, size_t _Nm>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr _Tp*
data(_Tp (&__array)[_Nm]) noexcept
{ return __array; }
@@ -338,7 +341,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @param __il Initializer list.
*/
template <typename _Tp>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr const _Tp*
data(initializer_list<_Tp> __il) noexcept
{ return __il.begin(); }
@@ -346,7 +349,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#if __cplusplus > 201703L
#define __cpp_lib_ssize 201902L
template<typename _Container>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr auto
ssize(const _Container& __cont)
noexcept(noexcept(__cont.size()))
@@ -357,7 +360,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
template<typename _Tp, ptrdiff_t _Num>
- [[nodiscard]]
+ [[nodiscard, __gnu__::__always_inline__]]
constexpr ptrdiff_t
ssize(const _Tp (&)[_Num]) noexcept
{ return _Num; }
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