blob: 74aede2b56686e2de10710ac7a168a245b2b78ab (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
//===----------------------------------------------------------------------===//
//
// 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___ALGORITHM_HALF_POSITIVE_H
#define _LIBCPP___ALGORITHM_HALF_POSITIVE_H
#include <__config>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
// Perform division by two quickly for positive integers (llvm.org/PR39129)
template <typename _Integral>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
is_integral<_Integral>::value,
_Integral
>::type
__half_positive(_Integral __value)
{
return static_cast<_Integral>(static_cast<__make_unsigned_t<_Integral> >(__value) / 2);
}
template <typename _Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
!is_integral<_Tp>::value,
_Tp
>::type
__half_positive(_Tp __value)
{
return __value / 2;
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_HALF_POSITIVE_H
|
