Nikolas Klauser 15edf8725a
[libc++] Optimize num_put integral functions (#120859)
```
-------------------------------------------------------
Benchmark                              old          new
-------------------------------------------------------
BM_num_put<bool>                   76.2 ns      32.0 ns
BM_num_put<long>                   76.9 ns      33.1 ns
BM_num_put<long long>              77.9 ns      34.2 ns
BM_num_put<unsigned long>          78.4 ns      33.1 ns
BM_num_put<unsigned long long>     78.0 ns      34.4 ns
BM_num_put<double>                  224 ns       228 ns
BM_num_put<long double>             239 ns       230 ns
BM_num_put<const void*>            68.7 ns      35.1 ns
```

Fixes #40109.
2025-03-05 14:18:49 +01:00

49 lines
1.3 KiB
C++

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___CHARCONV_TO_CHARS_RESULT_H
#define _LIBCPP___CHARCONV_TO_CHARS_RESULT_H
#include <__config>
#include <__system_error/errc.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 17
struct _LIBCPP_EXPORTED_FROM_ABI to_chars_result {
char* ptr;
errc ec;
# if _LIBCPP_STD_VER >= 20
_LIBCPP_HIDE_FROM_ABI friend bool operator==(const to_chars_result&, const to_chars_result&) = default;
# endif
# if _LIBCPP_STD_VER >= 26
_LIBCPP_HIDE_FROM_ABI constexpr explicit operator bool() const noexcept { return ec == errc{}; }
# endif
};
#endif // _LIBCPP_STD_VER >= 17
struct __to_chars_result {
char* __ptr;
errc __ec;
#if _LIBCPP_STD_VER >= 17
_LIBCPP_HIDE_FROM_ABI constexpr operator to_chars_result() { return {__ptr, __ec}; }
#endif
};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___CHARCONV_TO_CHARS_RESULT_H