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annotate contrib/python-zstandard/zstd/common/compiler.h @ 53042:cdd7bf612c7b stable tip

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bundle-spec: properly format boolean parameter (issue6960) This was breaking automatic clone bundle generation. This changeset fixes it and add a test to catch it in the future.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 11 Mar 2025 02:29:42 +0100
parents de7838053207
children
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1 /*
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2 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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3 * All rights reserved.
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4 *
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5 * This source code is licensed under both the BSD-style license (found in the
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6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
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7 * in the COPYING file in the root directory of this source tree).
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8 * You may select, at your option, one of the above-listed licenses.
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9 */
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10
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11 #ifndef ZSTD_COMPILER_H
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12 #define ZSTD_COMPILER_H
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13
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14 /*-*******************************************************
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15 * Compiler specifics
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16 *********************************************************/
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17 /* force inlining */
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18
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19 #if !defined(ZSTD_NO_INLINE)
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20 #if defined (__GNUC__) || defined(__cplusplus) || defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */
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21 # define INLINE_KEYWORD inline
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22 #else
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23 # define INLINE_KEYWORD
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24 #endif
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25
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26 #if defined(__GNUC__) || defined(__ICCARM__)
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27 # define FORCE_INLINE_ATTR __attribute__((always_inline))
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28 #elif defined(_MSC_VER)
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29 # define FORCE_INLINE_ATTR __forceinline
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30 #else
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31 # define FORCE_INLINE_ATTR
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32 #endif
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33
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34 #else
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35
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36 #define INLINE_KEYWORD
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37 #define FORCE_INLINE_ATTR
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38
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39 #endif
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40
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41 /**
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42 * FORCE_INLINE_TEMPLATE is used to define C "templates", which take constant
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43 * parameters. They must be inlined for the compiler to eliminate the constant
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44 * branches.
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45 */
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46 #define FORCE_INLINE_TEMPLATE static INLINE_KEYWORD FORCE_INLINE_ATTR
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47 /**
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48 * HINT_INLINE is used to help the compiler generate better code. It is *not*
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49 * used for "templates", so it can be tweaked based on the compilers
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50 * performance.
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51 *
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52 * gcc-4.8 and gcc-4.9 have been shown to benefit from leaving off the
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53 * always_inline attribute.
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54 *
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55 * clang up to 5.0.0 (trunk) benefit tremendously from the always_inline
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56 * attribute.
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57 */
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58 #if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8 && __GNUC__ < 5
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59 # define HINT_INLINE static INLINE_KEYWORD
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60 #else
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61 # define HINT_INLINE static INLINE_KEYWORD FORCE_INLINE_ATTR
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62 #endif
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63
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64 /* UNUSED_ATTR tells the compiler it is okay if the function is unused. */
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65 #if defined(__GNUC__)
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66 # define UNUSED_ATTR __attribute__((unused))
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67 #else
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68 # define UNUSED_ATTR
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69 #endif
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70
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71 /* force no inlining */
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72 #ifdef _MSC_VER
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73 # define FORCE_NOINLINE static __declspec(noinline)
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74 #else
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75 # if defined(__GNUC__) || defined(__ICCARM__)
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76 # define FORCE_NOINLINE static __attribute__((__noinline__))
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77 # else
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78 # define FORCE_NOINLINE static
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79 # endif
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80 #endif
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81
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82 /* target attribute */
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83 #ifndef __has_attribute
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84 #define __has_attribute(x) 0 /* Compatibility with non-clang compilers. */
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85 #endif
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86 #if defined(__GNUC__) || defined(__ICCARM__)
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87 # define TARGET_ATTRIBUTE(target) __attribute__((__target__(target)))
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88 #else
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89 # define TARGET_ATTRIBUTE(target)
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90 #endif
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91
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92 /* Enable runtime BMI2 dispatch based on the CPU.
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93 * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default.
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94 */
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95 #ifndef DYNAMIC_BMI2
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96 #if ((defined(__clang__) && __has_attribute(__target__)) \
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97 || (defined(__GNUC__) \
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98 && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \
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99 && (defined(__x86_64__) || defined(_M_X86)) \
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100 && !defined(__BMI2__)
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101 # define DYNAMIC_BMI2 1
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102 #else
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103 # define DYNAMIC_BMI2 0
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104 #endif
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105 #endif
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106
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107 /* prefetch
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108 * can be disabled, by declaring NO_PREFETCH build macro */
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109 #if defined(NO_PREFETCH)
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110 # define PREFETCH_L1(ptr) (void)(ptr) /* disabled */
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111 # define PREFETCH_L2(ptr) (void)(ptr) /* disabled */
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112 #else
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113 # if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */
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114 # include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
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115 # define PREFETCH_L1(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T0)
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116 # define PREFETCH_L2(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1)
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117 # elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
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118 # define PREFETCH_L1(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */)
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119 # define PREFETCH_L2(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */)
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120 # else
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121 # define PREFETCH_L1(ptr) (void)(ptr) /* disabled */
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122 # define PREFETCH_L2(ptr) (void)(ptr) /* disabled */
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123 # endif
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124 #endif /* NO_PREFETCH */
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125
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126 #define CACHELINE_SIZE 64
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127
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128 #define PREFETCH_AREA(p, s) { \
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129 const char* const _ptr = (const char*)(p); \
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130 size_t const _size = (size_t)(s); \
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131 size_t _pos; \
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132 for (_pos=0; _pos<_size; _pos+=CACHELINE_SIZE) { \
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133 PREFETCH_L2(_ptr + _pos); \
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134 } \
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135 }
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136
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137 /* vectorization
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138 * older GCC (pre gcc-4.3 picked as the cutoff) uses a different syntax */
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139 #if !defined(__clang__) && defined(__GNUC__)
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140 # if (__GNUC__ == 4 && __GNUC_MINOR__ > 3) || (__GNUC__ >= 5)
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141 # define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize")))
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142 # else
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143 # define DONT_VECTORIZE _Pragma("GCC optimize(\"no-tree-vectorize\")")
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144 # endif
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145 #else
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146 # define DONT_VECTORIZE
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147 #endif
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148
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149 /* disable warnings */
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150 #ifdef _MSC_VER /* Visual Studio */
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151 # include <intrin.h> /* For Visual 2005 */
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152 # pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */
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153 # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
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154 # pragma warning(disable : 4204) /* disable: C4204: non-constant aggregate initializer */
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155 # pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */
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156 # pragma warning(disable : 4324) /* disable: C4324: padded structure */
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157 #endif
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158
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159 #endif /* ZSTD_COMPILER_H */