1 | /* |
1 | /* |
2 | * libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
3 | * |
3 | * |
4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann |
4 | * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de> |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
6 | * All rights reserved. |
6 | * All rights reserved. |
7 | * |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * Redistribution and use in source and binary forms, with or without modifica- |
9 | * tion, are permitted provided that the following conditions are met: |
9 | * tion, are permitted provided that the following conditions are met: |
… | |
… | |
28 | */ |
28 | */ |
29 | |
29 | |
30 | #ifndef ECB_H |
30 | #ifndef ECB_H |
31 | #define ECB_H |
31 | #define ECB_H |
32 | |
32 | |
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33 | /* 16 bits major, 16 bits minor */ |
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34 | #define ECB_VERSION 0x00010001 |
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35 | |
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36 | #ifdef _WIN32 |
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37 | typedef signed char int8_t; |
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38 | typedef unsigned char uint8_t; |
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39 | typedef signed short int16_t; |
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40 | typedef unsigned short uint16_t; |
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41 | typedef signed int int32_t; |
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42 | typedef unsigned int uint32_t; |
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43 | #if __GNUC__ |
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44 | typedef signed long long int64_t; |
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45 | typedef unsigned long long uint64_t; |
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46 | #else /* _MSC_VER || __BORLANDC__ */ |
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47 | typedef signed __int64 int64_t; |
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48 | typedef unsigned __int64 uint64_t; |
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49 | #endif |
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50 | #ifdef _WIN64 |
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51 | #define ECB_PTRSIZE 8 |
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52 | typedef uint64_t uintptr_t; |
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53 | typedef int64_t intptr_t; |
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54 | #else |
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55 | #define ECB_PTRSIZE 4 |
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56 | typedef uint32_t uintptr_t; |
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57 | typedef int32_t intptr_t; |
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58 | #endif |
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59 | #else |
33 | #include <inttypes.h> |
60 | #include <inttypes.h> |
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61 | #if UINTMAX_MAX > 0xffffffffU |
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62 | #define ECB_PTRSIZE 8 |
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63 | #else |
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64 | #define ECB_PTRSIZE 4 |
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65 | #endif |
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66 | #endif |
34 | |
67 | |
35 | /* many compilers define _GNUC_ to some versions but then only implement |
68 | /* many compilers define _GNUC_ to some versions but then only implement |
36 | * what their idiot authors think are the "more important" extensions, |
69 | * what their idiot authors think are the "more important" extensions, |
37 | * causing enourmous grief for some better fake benchmark numbers or so. |
70 | * causing enormous grief in return for some better fake benchmark numbers. |
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71 | * or so. |
38 | * we try to detect these and simply assume they are not gcc - if they have |
72 | * we try to detect these and simply assume they are not gcc - if they have |
39 | * an issue with that they should have done it right in the first place. |
73 | * an issue with that they should have done it right in the first place. |
40 | */ |
74 | */ |
41 | #ifndef ECB_GCC_VERSION |
75 | #ifndef ECB_GCC_VERSION |
42 | # if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
76 | #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ |
43 | # define ECB_GCC_VERSION(major,minor) 0 |
77 | #define ECB_GCC_VERSION(major,minor) 0 |
44 | # else |
78 | #else |
45 | # define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
79 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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80 | #endif |
46 | # endif |
81 | #endif |
47 | #endif |
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48 | |
82 | |
49 | #ifndef __cplusplus |
83 | #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ |
50 | # if __STDC_VERSION__ >= 199901L |
84 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
51 | # define ECB_INLINE inline |
85 | #define ECB_C11 (__STDC_VERSION__ >= 201112L) |
52 | typedef _Bool ecb_bool; |
86 | #define ECB_CPP (__cplusplus+0) |
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87 | #define ECB_CPP11 (__cplusplus >= 201103L) |
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88 | |
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89 | #if ECB_CPP |
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90 | #define ECB_EXTERN_C extern "C" |
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91 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
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92 | #define ECB_EXTERN_C_END } |
53 | # else |
93 | #else |
54 | # define ECB_INLINE inline /* yeah! */ |
94 | #define ECB_EXTERN_C extern |
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95 | #define ECB_EXTERN_C_BEG |
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96 | #define ECB_EXTERN_C_END |
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97 | #endif |
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98 | |
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99 | /*****************************************************************************/ |
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100 | |
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101 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
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102 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
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103 | |
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104 | #if ECB_NO_THREADS |
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105 | #define ECB_NO_SMP 1 |
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106 | #endif |
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107 | |
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108 | #if ECB_NO_SMP |
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109 | #define ECB_MEMORY_FENCE do { } while (0) |
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110 | #endif |
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111 | |
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112 | #ifndef ECB_MEMORY_FENCE |
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113 | #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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114 | #if __i386 || __i386__ |
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115 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
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116 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
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117 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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118 | #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ |
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119 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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120 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
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121 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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122 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
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123 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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124 | #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ |
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125 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
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126 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
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127 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
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128 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
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129 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
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130 | #elif __sparc || __sparc__ |
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131 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
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132 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
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133 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
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134 | #elif defined __s390__ || defined __s390x__ |
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135 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
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136 | #elif defined __mips__ |
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137 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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138 | #elif defined __alpha__ |
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139 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
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140 | #elif defined __hppa__ |
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141 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
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142 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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143 | #elif defined __ia64__ |
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144 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
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145 | #endif |
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146 | #endif |
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147 | #endif |
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148 | |
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149 | #ifndef ECB_MEMORY_FENCE |
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150 | #if ECB_GCC_VERSION(4,7) |
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151 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
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152 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
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153 | /*#elif defined __clang && __has_feature (cxx_atomic)*/ |
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154 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
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155 | /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/ |
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156 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
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157 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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158 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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159 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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160 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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161 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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162 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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163 | #elif defined _WIN32 |
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164 | #include <WinNT.h> |
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165 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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166 | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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167 | #include <mbarrier.h> |
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168 | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
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169 | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
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170 | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
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171 | #elif __xlC__ |
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172 | #define ECB_MEMORY_FENCE __sync () |
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173 | #endif |
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174 | #endif |
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175 | |
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176 | #ifndef ECB_MEMORY_FENCE |
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177 | #if ECB_C11 && !defined __STDC_NO_ATOMICS__ |
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178 | /* we assume that these memory fences work on all variables/all memory accesses, */ |
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179 | /* not just C11 atomics and atomic accesses */ |
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180 | #include <stdatomic.h> |
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181 | /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */ |
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182 | /* any fence other than seq_cst, which isn't very efficient for us. */ |
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183 | /* Why that is, we don't know - either the C11 memory model is quite useless */ |
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184 | /* for most usages, or gcc and clang have a bug */ |
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185 | /* I *currently* lean towards the latter, and inefficiently implement */ |
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186 | /* all three of ecb's fences as a seq_cst fence */ |
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187 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
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188 | #endif |
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189 | #endif |
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190 | |
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191 | #ifndef ECB_MEMORY_FENCE |
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192 | #if !ECB_AVOID_PTHREADS |
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193 | /* |
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194 | * if you get undefined symbol references to pthread_mutex_lock, |
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195 | * or failure to find pthread.h, then you should implement |
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196 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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197 | * OR provide pthread.h and link against the posix thread library |
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198 | * of your system. |
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199 | */ |
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200 | #include <pthread.h> |
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201 | #define ECB_NEEDS_PTHREADS 1 |
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202 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
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203 | |
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204 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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205 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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206 | #endif |
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207 | #endif |
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208 | |
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209 | #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE |
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210 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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211 | #endif |
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212 | |
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213 | #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE |
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214 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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215 | #endif |
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216 | |
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217 | /*****************************************************************************/ |
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218 | |
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219 | #if __cplusplus |
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220 | #define ecb_inline static inline |
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221 | #elif ECB_GCC_VERSION(2,5) |
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222 | #define ecb_inline static __inline__ |
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223 | #elif ECB_C99 |
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224 | #define ecb_inline static inline |
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225 | #else |
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226 | #define ecb_inline static |
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227 | #endif |
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228 | |
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229 | #if ECB_GCC_VERSION(3,3) |
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230 | #define ecb_restrict __restrict__ |
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231 | #elif ECB_C99 |
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232 | #define ecb_restrict restrict |
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233 | #else |
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234 | #define ecb_restrict |
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235 | #endif |
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236 | |
55 | typedef int ecb_bool; |
237 | typedef int ecb_bool; |
56 | # endif |
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57 | #endif |
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58 | |
238 | |
59 | #define ECB_CONCAT_(a, b) a ## b |
239 | #define ECB_CONCAT_(a, b) a ## b |
60 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
240 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
61 | #define ECB_STRINGIFY_(a) # a |
241 | #define ECB_STRINGIFY_(a) # a |
62 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
242 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
63 | |
243 | |
64 | #define ECB_HEADER_INLINE static ECB_INLINE |
244 | #define ecb_function_ ecb_inline |
65 | |
245 | |
66 | #if ECB_GCC_VERSION(3,1) |
246 | #if ECB_GCC_VERSION(3,1) |
67 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
247 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
68 | # define ecb_is_constant(c) __builtin_constant_p (c) |
248 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
69 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
249 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
70 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
250 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
71 | #else |
251 | #else |
72 | # define ecb_attribute(attrlist) |
252 | #define ecb_attribute(attrlist) |
73 | # define ecb_is_constant(c) 0 |
253 | #define ecb_is_constant(expr) 0 |
74 | # define ecb_expect(expr,value) (expr) |
254 | #define ecb_expect(expr,value) (expr) |
75 | # define ecb_prefetch(addr,rw,locality) |
255 | #define ecb_prefetch(addr,rw,locality) |
76 | #endif |
256 | #endif |
77 | |
257 | |
78 | /* no emulation for ecb_decltype */ |
258 | /* no emulation for ecb_decltype */ |
79 | #if ECB_GCC_VERSION(4,5) |
259 | #if ECB_GCC_VERSION(4,5) |
80 | # define ecb_decltype(x) __decltype(x) |
260 | #define ecb_decltype(x) __decltype(x) |
81 | #elif ECB_GCC_VERSION(3,0) |
261 | #elif ECB_GCC_VERSION(3,0) |
82 | # define ecb_decltype(x) typeof(x) |
262 | #define ecb_decltype(x) __typeof(x) |
83 | #endif |
263 | #endif |
84 | |
264 | |
85 | #define ecb_noinline ecb_attribute ((noinline)) |
265 | #define ecb_noinline ecb_attribute ((__noinline__)) |
86 | #define ecb_noreturn ecb_attribute ((noreturn)) |
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87 | #define ecb_unused ecb_attribute ((unused)) |
266 | #define ecb_unused ecb_attribute ((__unused__)) |
88 | #define ecb_const ecb_attribute ((const)) |
267 | #define ecb_const ecb_attribute ((__const__)) |
89 | #define ecb_pure ecb_attribute ((pure)) |
268 | #define ecb_pure ecb_attribute ((__pure__)) |
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269 | |
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270 | #if ECB_C11 |
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271 | #define ecb_noreturn _Noreturn |
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272 | #else |
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273 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
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274 | #endif |
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275 | |
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276 | #if ECB_GCC_VERSION(4,3) |
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277 | #define ecb_artificial ecb_attribute ((__artificial__)) |
90 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
278 | #define ecb_hot ecb_attribute ((__hot__)) |
91 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
279 | #define ecb_cold ecb_attribute ((__cold__)) |
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280 | #else |
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281 | #define ecb_artificial |
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282 | #define ecb_hot |
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283 | #define ecb_cold |
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284 | #endif |
92 | |
285 | |
93 | /* put into ifs if you are very sure that the expression */ |
286 | /* put around conditional expressions if you are very sure that the */ |
94 | /* is mostly true or mosty false. note that these return */ |
287 | /* expression is mostly true or mostly false. note that these return */ |
95 | /* booleans, not the expression. */ |
288 | /* booleans, not the expression. */ |
96 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
289 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
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290 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
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291 | /* for compatibility to the rest of the world */ |
97 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
292 | #define ecb_likely(expr) ecb_expect_true (expr) |
98 | |
293 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
99 | /* try to tell the compiler that some condition is definitely true */ |
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100 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
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101 | |
294 | |
102 | /* count trailing zero bits and count # of one bits */ |
295 | /* count trailing zero bits and count # of one bits */ |
103 | #if ECB_GCC_VERSION(3,4) |
296 | #if ECB_GCC_VERSION(3,4) |
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297 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
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298 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
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299 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
104 | #define ecb_ctz32 (x) __builtin_ctz (x) |
300 | #define ecb_ctz32(x) __builtin_ctz (x) |
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301 | #define ecb_ctz64(x) __builtin_ctzll (x) |
105 | #define ecb_popcount32 (x) __builtin_popcount (x) |
302 | #define ecb_popcount32(x) __builtin_popcount (x) |
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303 | /* no popcountll */ |
106 | #else |
304 | #else |
107 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
305 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
108 | ECB_HEADER_INLINE |
306 | ecb_function_ int |
109 | ecb_ctz32 (uint32_t x) |
307 | ecb_ctz32 (uint32_t x) |
110 | { |
308 | { |
111 | int r = 0; |
309 | int r = 0; |
112 | |
310 | |
113 | x &= -x; /* this isolates the lowest bit */ |
311 | x &= ~x + 1; /* this isolates the lowest bit */ |
114 | |
312 | |
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313 | #if ECB_branchless_on_i386 |
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314 | r += !!(x & 0xaaaaaaaa) << 0; |
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315 | r += !!(x & 0xcccccccc) << 1; |
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316 | r += !!(x & 0xf0f0f0f0) << 2; |
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317 | r += !!(x & 0xff00ff00) << 3; |
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318 | r += !!(x & 0xffff0000) << 4; |
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319 | #else |
115 | if (x & 0xaaaaaaaa) r += 1; |
320 | if (x & 0xaaaaaaaa) r += 1; |
116 | if (x & 0xcccccccc) r += 2; |
321 | if (x & 0xcccccccc) r += 2; |
117 | if (x & 0xf0f0f0f0) r += 4; |
322 | if (x & 0xf0f0f0f0) r += 4; |
118 | if (x & 0xff00ff00) r += 8; |
323 | if (x & 0xff00ff00) r += 8; |
119 | if (x & 0xffff0000) r += 16; |
324 | if (x & 0xffff0000) r += 16; |
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325 | #endif |
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326 | |
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327 | return r; |
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328 | } |
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329 | |
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330 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
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331 | ecb_function_ int |
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332 | ecb_ctz64 (uint64_t x) |
|
|
333 | { |
|
|
334 | int shift = x & 0xffffffffU ? 0 : 32; |
|
|
335 | return ecb_ctz32 (x >> shift) + shift; |
|
|
336 | } |
|
|
337 | |
|
|
338 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
|
|
339 | ecb_function_ int |
|
|
340 | ecb_popcount32 (uint32_t x) |
|
|
341 | { |
|
|
342 | x -= (x >> 1) & 0x55555555; |
|
|
343 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
|
|
344 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
|
|
345 | x *= 0x01010101; |
|
|
346 | |
|
|
347 | return x >> 24; |
|
|
348 | } |
|
|
349 | |
|
|
350 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
|
|
351 | ecb_function_ int ecb_ld32 (uint32_t x) |
|
|
352 | { |
|
|
353 | int r = 0; |
|
|
354 | |
|
|
355 | if (x >> 16) { x >>= 16; r += 16; } |
|
|
356 | if (x >> 8) { x >>= 8; r += 8; } |
|
|
357 | if (x >> 4) { x >>= 4; r += 4; } |
|
|
358 | if (x >> 2) { x >>= 2; r += 2; } |
|
|
359 | if (x >> 1) { r += 1; } |
|
|
360 | |
|
|
361 | return r; |
|
|
362 | } |
|
|
363 | |
|
|
364 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
|
|
365 | ecb_function_ int ecb_ld64 (uint64_t x) |
|
|
366 | { |
|
|
367 | int r = 0; |
|
|
368 | |
|
|
369 | if (x >> 32) { x >>= 32; r += 32; } |
|
|
370 | |
|
|
371 | return r + ecb_ld32 (x); |
|
|
372 | } |
|
|
373 | #endif |
|
|
374 | |
|
|
375 | ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const; |
|
|
376 | ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
|
|
377 | ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const; |
|
|
378 | ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } |
|
|
379 | |
|
|
380 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
|
|
381 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
|
|
382 | { |
|
|
383 | return ( (x * 0x0802U & 0x22110U) |
|
|
384 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
|
|
385 | } |
|
|
386 | |
|
|
387 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
|
|
388 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
|
|
389 | { |
|
|
390 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
|
|
391 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
|
|
392 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
|
|
393 | x = ( x >> 8 ) | ( x << 8); |
|
|
394 | |
|
|
395 | return x; |
|
|
396 | } |
|
|
397 | |
|
|
398 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
|
|
399 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
|
|
400 | { |
|
|
401 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
|
|
402 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
|
|
403 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
|
|
404 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
|
|
405 | x = ( x >> 16 ) | ( x << 16); |
|
|
406 | |
|
|
407 | return x; |
|
|
408 | } |
|
|
409 | |
|
|
410 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
|
|
411 | /* so for this version we are lazy */ |
|
|
412 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
|
|
413 | ecb_function_ int |
|
|
414 | ecb_popcount64 (uint64_t x) |
|
|
415 | { |
|
|
416 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
|
|
417 | } |
|
|
418 | |
|
|
419 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
|
|
420 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
|
|
421 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
|
|
422 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
|
|
423 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
|
|
424 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
|
|
425 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
|
|
426 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
|
|
427 | |
|
|
428 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
|
|
429 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
|
|
430 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
|
|
431 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
|
|
432 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
|
|
433 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
|
|
434 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
|
|
435 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
|
|
436 | |
|
|
437 | #if ECB_GCC_VERSION(4,3) |
|
|
438 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
|
|
439 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
440 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
|
|
441 | #else |
|
|
442 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
|
|
443 | ecb_function_ uint16_t |
|
|
444 | ecb_bswap16 (uint16_t x) |
|
|
445 | { |
|
|
446 | return ecb_rotl16 (x, 8); |
|
|
447 | } |
|
|
448 | |
|
|
449 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
|
|
450 | ecb_function_ uint32_t |
|
|
451 | ecb_bswap32 (uint32_t x) |
|
|
452 | { |
|
|
453 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
|
|
454 | } |
|
|
455 | |
|
|
456 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
|
|
457 | ecb_function_ uint64_t |
|
|
458 | ecb_bswap64 (uint64_t x) |
|
|
459 | { |
|
|
460 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
|
|
461 | } |
|
|
462 | #endif |
|
|
463 | |
|
|
464 | #if ECB_GCC_VERSION(4,5) |
|
|
465 | #define ecb_unreachable() __builtin_unreachable () |
|
|
466 | #else |
|
|
467 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
|
|
468 | ecb_inline void ecb_unreachable (void) ecb_noreturn; |
|
|
469 | ecb_inline void ecb_unreachable (void) { } |
|
|
470 | #endif |
|
|
471 | |
|
|
472 | /* try to tell the compiler that some condition is definitely true */ |
|
|
473 | #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
|
|
474 | |
|
|
475 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
|
|
476 | ecb_inline unsigned char |
|
|
477 | ecb_byteorder_helper (void) |
|
|
478 | { |
|
|
479 | /* the union code still generates code under pressure in gcc, */ |
|
|
480 | /* but less than using pointers, and always seem to */ |
|
|
481 | /* successfully return a constant. */ |
|
|
482 | /* the reason why we have this horrible preprocessor mess */ |
|
|
483 | /* is to avoid it in all cases, at least on common architectures */ |
|
|
484 | /* and yes, gcc defines __BYTE_ORDER__, g++ does not */ |
|
|
485 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
|
|
486 | return 0x44; |
|
|
487 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
|
|
488 | return 0x44; |
|
|
489 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
|
|
490 | retrurn 0x11; |
|
|
491 | #else |
|
|
492 | union |
|
|
493 | { |
|
|
494 | uint32_t i; |
|
|
495 | uint8_t c; |
|
|
496 | } u = { 0x11223344 }; |
|
|
497 | return u.c; |
|
|
498 | #endif |
|
|
499 | } |
|
|
500 | |
|
|
501 | ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
|
|
502 | ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
|
|
503 | ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
|
|
504 | ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
|
|
505 | |
|
|
506 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
|
|
507 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
|
|
508 | #else |
|
|
509 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
|
|
510 | #endif |
|
|
511 | |
|
|
512 | #if __cplusplus |
|
|
513 | template<typename T> |
|
|
514 | static inline T ecb_div_rd (T val, T div) |
|
|
515 | { |
|
|
516 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
|
|
517 | } |
|
|
518 | template<typename T> |
|
|
519 | static inline T ecb_div_ru (T val, T div) |
|
|
520 | { |
|
|
521 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
|
|
522 | } |
|
|
523 | #else |
|
|
524 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
|
|
525 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
|
|
526 | #endif |
|
|
527 | |
|
|
528 | #if ecb_cplusplus_does_not_suck |
|
|
529 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
|
|
530 | template<typename T, int N> |
|
|
531 | static inline int ecb_array_length (const T (&arr)[N]) |
|
|
532 | { |
|
|
533 | return N; |
|
|
534 | } |
|
|
535 | #else |
|
|
536 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
|
|
537 | #endif |
|
|
538 | |
|
|
539 | #if __STDC_IEC_559__ |
|
|
540 | // we assume this is defined for most C and many C++ compilers |
|
|
541 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
|
|
542 | ecb_inline ecb_bool ecb_float_ieee (void) { return 1; } |
|
|
543 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
|
|
544 | ecb_inline ecb_bool ecb_double_ieee (void) { return 1; } |
|
|
545 | #elif ECB_CPP |
|
|
546 | #include <limits> |
|
|
547 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
|
|
548 | ecb_inline ecb_bool ecb_float_ieee (void) { return std::numeric_limits<float >::is_iec559; } |
|
|
549 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
|
|
550 | ecb_inline ecb_bool ecb_double_ieee (void) { return std::numeric_limits<double>::is_iec559; } |
|
|
551 | #else |
|
|
552 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
|
|
553 | ecb_inline ecb_bool ecb_float_ieee (void) { return 0; } |
|
|
554 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
|
|
555 | ecb_inline ecb_bool ecb_double_ieee (void) { return 0; } |
|
|
556 | #endif |
|
|
557 | |
|
|
558 | // convert a float to ieee single/binary32 |
|
|
559 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
|
|
560 | ecb_function_ uint32_t |
|
|
561 | ecb_float_to_binary32 (float x) |
|
|
562 | { |
|
|
563 | /* slow emulation, works for anything but nan's and -0 */ |
|
|
564 | ECB_EXTERN_C float frexpf (float v, int *e); |
|
|
565 | uint32_t r, m; |
|
|
566 | int e; |
|
|
567 | |
|
|
568 | if (x == 0e0f ) return 0; |
|
|
569 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
|
|
570 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
|
|
571 | |
|
|
572 | m = frexpf (x, &e) * 0x1000000U; |
|
|
573 | |
|
|
574 | r = m & 0x80000000U; |
|
|
575 | |
|
|
576 | if (r) |
|
|
577 | m = -m; |
|
|
578 | |
|
|
579 | if (e < -125) |
|
|
580 | { |
|
|
581 | m &= 0xffffffU; |
|
|
582 | m >>= (-125 - e); |
|
|
583 | e = -126; |
|
|
584 | } |
|
|
585 | |
|
|
586 | r |= (e + 126) << 23; |
|
|
587 | r |= m & 0x7fffffU; |
120 | |
588 | |
121 | return r; |
589 | return r; |
122 | } |
590 | } |
123 | |
591 | |
124 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
592 | // converts a ieee single/binary32 to a float |
125 | ECB_HEADER_INLINE |
593 | ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; |
126 | ecb_popcount32 (uint32_t x) |
594 | ecb_function_ float |
|
|
595 | ecb_binary32_to_float (uint32_t x) |
127 | { |
596 | { |
128 | x -= (x >> 1) & 0x55555555; |
597 | /* emulation, only works for normals and subnormals and +0 */ |
129 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
598 | ECB_EXTERN_C float ldexpf (float x, int e); |
130 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
|
|
131 | x *= 0x01010101; |
|
|
132 | |
599 | |
133 | return x >> 24; |
600 | int neg = x >> 31; |
134 | } |
601 | int e = (x >> 23) & 0xffU; |
135 | #endif |
602 | float r; |
136 | |
603 | |
137 | #if ECB_GCC_VERSION(4,3) |
604 | x &= 0x7fffffU; |
138 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
139 | #else |
|
|
140 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
|
|
141 | ECB_HEADER_INLINE uint32_t |
|
|
142 | ecb_bswap32 (uint32_t x) |
|
|
143 | { |
|
|
144 | return (x >> 24) |
|
|
145 | | ((x >> 8) & 0x0000ff00) |
|
|
146 | | ((x << 8) & 0x00ff0000) |
|
|
147 | | (x << 24); |
|
|
148 | } |
|
|
149 | #endif |
|
|
150 | |
605 | |
151 | #if ECB_GCC_VERSION(4,5) |
606 | if (e) |
152 | # define ecb_unreachable() __builtin_unreachable () |
607 | x |= 0x800000U; |
153 | #else |
|
|
154 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
|
|
155 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn)); |
|
|
156 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
|
|
157 | #endif |
|
|
158 | |
608 | |
159 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
609 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
160 | ECB_HEADER_INLINE unsigned char |
610 | r = ldexpf (x * (1.f / 0x1000000U), e - 126); |
161 | ecb_byteorder_helper () |
|
|
162 | { |
|
|
163 | const uint32_t u = 0x11223344; |
|
|
164 | return *(unsigned char *)&u; |
|
|
165 | } |
|
|
166 | |
611 | |
167 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; |
612 | return neg ? -r : r; |
168 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; |
|
|
169 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; |
|
|
170 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; |
|
|
171 | |
|
|
172 | #if ecb_cplusplus_does_not_suck |
|
|
173 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
|
|
174 | template<typename T, int N> |
|
|
175 | static inline int ecb_array_length (const T (&arr)[N]) |
|
|
176 | { |
|
|
177 | return N; |
|
|
178 | } |
613 | } |
179 | #else |
|
|
180 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
|
|
181 | #endif |
|
|
182 | |
614 | |
183 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
615 | ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; |
184 | ECB_INLINE uint32_t |
616 | ecb_function_ uint64_t |
185 | ecb_rotr32 (uint32_t x, unsigned int count) |
617 | ecb_double_to_binary64 (double x) |
186 | { |
618 | { |
187 | return (x << (32 - count)) | (x >> count); |
|
|
188 | } |
619 | } |
189 | |
620 | |
190 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
|
|
191 | ECB_INLINE uint32_t |
|
|
192 | ecb_rotl32 (uint32_t x, unsigned int count) |
|
|
193 | { |
|
|
194 | return (x >> (32 - count)) | (x << count); |
|
|
195 | } |
|
|
196 | |
|
|
197 | #endif |
621 | #endif |
198 | |
622 | |