Coverage Report

Created: 2022-07-16 07:03

/Users/buildslave/jenkins/workspace/coverage/llvm-project/libcxx/src/include/ryu/common.h
Line
Count
Source (jump to first uncovered line)
1
//===----------------------------------------------------------------------===//
2
//
3
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4
// See https://llvm.org/LICENSE.txt for license information.
5
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6
//
7
//===----------------------------------------------------------------------===//
8
9
// Copyright (c) Microsoft Corporation.
10
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
11
12
// Copyright 2018 Ulf Adams
13
// Copyright (c) Microsoft Corporation. All rights reserved.
14
15
// Boost Software License - Version 1.0 - August 17th, 2003
16
17
// Permission is hereby granted, free of charge, to any person or organization
18
// obtaining a copy of the software and accompanying documentation covered by
19
// this license (the "Software") to use, reproduce, display, distribute,
20
// execute, and transmit the Software, and to prepare derivative works of the
21
// Software, and to permit third-parties to whom the Software is furnished to
22
// do so, all subject to the following:
23
24
// The copyright notices in the Software and this entire statement, including
25
// the above license grant, this restriction and the following disclaimer,
26
// must be included in all copies of the Software, in whole or in part, and
27
// all derivative works of the Software, unless such copies or derivative
28
// works are solely in the form of machine-executable object code generated by
29
// a source language processor.
30
31
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
32
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
33
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
34
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
35
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
36
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
37
// DEALINGS IN THE SOFTWARE.
38
39
#ifndef _LIBCPP_SRC_INCLUDE_RYU_COMMON_H
40
#define _LIBCPP_SRC_INCLUDE_RYU_COMMON_H
41
42
// Avoid formatting to keep the changes with the original code minimal.
43
// clang-format off
44
45
#include <__assert>
46
#include "__config"
47
48
_LIBCPP_BEGIN_NAMESPACE_STD
49
50
0
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline uint32_t __decimalLength9(const uint32_t __v) {
51
  // Function precondition: __v is not a 10-digit number.
52
  // (f2s: 9 digits are sufficient for round-tripping.)
53
  // (d2fixed: We print 9-digit blocks.)
54
0
  _LIBCPP_ASSERT(__v < 1000000000, "");
55
0
  if (__v >= 100000000) { return 9; }
56
0
  if (__v >= 10000000) { return 8; }
57
0
  if (__v >= 1000000) { return 7; }
58
0
  if (__v >= 100000) { return 6; }
59
0
  if (__v >= 10000) { return 5; }
60
0
  if (__v >= 1000) { return 4; }
61
0
  if (__v >= 100) { return 3; }
62
0
  if (__v >= 10) { return 2; }
63
0
  return 1;
64
0
}
65
66
// Returns __e == 0 ? 1 : ceil(log_2(5^__e)).
67
0
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI  inline int32_t __pow5bits(const int32_t __e) {
68
  // This approximation works up to the point that the multiplication overflows at __e = 3529.
69
  // If the multiplication were done in 64 bits, it would fail at 5^4004 which is just greater
70
  // than 2^9297.
71
0
  _LIBCPP_ASSERT(__e >= 0, "");
72
0
  _LIBCPP_ASSERT(__e <= 3528, "");
73
0
  return static_cast<int32_t>(((static_cast<uint32_t>(__e) * 1217359) >> 19) + 1);
74
0
}
75
76
// Returns floor(log_10(2^__e)).
77
0
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI  inline uint32_t __log10Pow2(const int32_t __e) {
78
  // The first value this approximation fails for is 2^1651 which is just greater than 10^297.
79
0
  _LIBCPP_ASSERT(__e >= 0, "");
80
0
  _LIBCPP_ASSERT(__e <= 1650, "");
81
0
  return (static_cast<uint32_t>(__e) * 78913) >> 18;
82
0
}
83
84
// Returns floor(log_10(5^__e)).
85
0
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline uint32_t __log10Pow5(const int32_t __e) {
86
  // The first value this approximation fails for is 5^2621 which is just greater than 10^1832.
87
0
  _LIBCPP_ASSERT(__e >= 0, "");
88
0
  _LIBCPP_ASSERT(__e <= 2620, "");
89
0
  return (static_cast<uint32_t>(__e) * 732923) >> 20;
90
0
}
91
92
0
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline uint32_t __float_to_bits(const float __f) {
93
0
  uint32_t __bits = 0;
94
0
  _VSTD::memcpy(&__bits, &__f, sizeof(float));
95
0
  return __bits;
96
0
}
97
98
0
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI inline uint64_t __double_to_bits(const double __d) {
99
0
  uint64_t __bits = 0;
100
0
  _VSTD::memcpy(&__bits, &__d, sizeof(double));
101
0
  return __bits;
102
0
}
103
104
_LIBCPP_END_NAMESPACE_STD
105
106
// clang-format on
107
108
#endif // _LIBCPP_SRC_INCLUDE_RYU_COMMON_H