| 1 | /* |
1 | /* |
| 2 | * libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
| 3 | * |
3 | * |
| 4 | * Copyright (c) 2011 Marc Alexander Lehmann |
4 | * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de> |
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5 | * Copyright (©) 2011 Emanuele Giaquinta |
| 5 | * All rights reserved. |
6 | * All rights reserved. |
| 6 | * |
7 | * |
| 7 | * 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- |
| 8 | * tion, are permitted provided that the following conditions are met: |
9 | * tion, are permitted provided that the following conditions are met: |
| 9 | * |
10 | * |
| … | |
… | |
| 27 | */ |
28 | */ |
| 28 | |
29 | |
| 29 | #ifndef ECB_H |
30 | #ifndef ECB_H |
| 30 | #define ECB_H |
31 | #define ECB_H |
| 31 | |
32 | |
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33 | #ifdef _WIN32 |
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34 | typedef signed char int8_t; |
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35 | typedef unsigned char uint8_t; |
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36 | typedef signed short int16_t; |
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37 | typedef unsigned short uint16_t; |
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38 | typedef signed int int32_t; |
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39 | typedef unsigned int uint32_t; |
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40 | #if __GNUC__ |
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41 | typedef signed long long int64_t; |
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42 | typedef unsigned long long uint64_t; |
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43 | #else /* _MSC_VER || __BORLANDC__ */ |
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44 | typedef signed __int64 int64_t; |
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45 | typedef unsigned __int64 uint64_t; |
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46 | #endif |
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47 | #else |
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48 | #include <inttypes.h> |
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49 | #endif |
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50 | |
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51 | /* many compilers define _GNUC_ to some versions but then only implement |
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52 | * what their idiot authors think are the "more important" extensions, |
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53 | * causing enormous grief in return for some better fake benchmark numbers. |
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54 | * or so. |
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55 | * we try to detect these and simply assume they are not gcc - if they have |
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56 | * an issue with that they should have done it right in the first place. |
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57 | */ |
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58 | #ifndef ECB_GCC_VERSION |
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59 | #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) |
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60 | #define ECB_GCC_VERSION(major,minor) 0 |
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61 | #else |
| 32 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
62 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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63 | #endif |
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64 | #endif |
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65 | |
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66 | /*****************************************************************************/ |
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67 | |
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68 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
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69 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
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70 | |
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71 | #if ECB_NO_THREADS |
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72 | # define ECB_NO_SMP 1 |
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73 | #endif |
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74 | |
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75 | #if ECB_NO_THREADS || ECB_NO_SMP |
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76 | #define ECB_MEMORY_FENCE do { } while (0) |
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77 | #endif |
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78 | |
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79 | #ifndef ECB_MEMORY_FENCE |
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80 | #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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81 | #if __i386 || __i386__ |
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82 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
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83 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ |
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84 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
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85 | #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ |
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86 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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87 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
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88 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ |
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89 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
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90 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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91 | #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ |
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92 | || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) |
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93 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
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94 | #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \ |
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95 | || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) |
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96 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
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97 | #elif __sparc || __sparc__ |
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98 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") |
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99 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
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100 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
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101 | #elif defined(__s390__) || defined(__s390x__) |
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102 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
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103 | #elif defined(__mips__) |
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104 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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105 | #elif __xlC__ |
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106 | #define ECB_MEMORY_FENCE __lwsync () |
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107 | #endif |
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108 | #endif |
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109 | #endif |
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110 | |
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111 | #ifndef ECB_MEMORY_FENCE |
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112 | #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__) |
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113 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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114 | /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
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115 | /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
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116 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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117 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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118 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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119 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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120 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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121 | #elif defined(_WIN32) |
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122 | #include <WinNT.h> |
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123 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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124 | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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125 | #include <mbarrier.h> |
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126 | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
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127 | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
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128 | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
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129 | #endif |
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130 | #endif |
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131 | |
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132 | #ifndef ECB_MEMORY_FENCE |
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133 | #if !ECB_AVOID_PTHREADS |
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134 | /* |
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135 | * if you get undefined symbol references to pthread_mutex_lock, |
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136 | * or failure to find pthread.h, then you should implement |
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137 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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138 | * OR provide pthread.h and link against the posix thread library |
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139 | * of your system. |
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140 | */ |
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141 | #include <pthread.h> |
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142 | #define ECB_NEEDS_PTHREADS 1 |
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143 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
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144 | |
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145 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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146 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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147 | #endif |
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148 | #endif |
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149 | |
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150 | #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) |
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151 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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152 | #endif |
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153 | |
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154 | #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) |
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155 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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156 | #endif |
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157 | |
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158 | /*****************************************************************************/ |
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159 | |
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160 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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161 | |
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162 | #if __cplusplus |
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163 | #define ecb_inline static inline |
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164 | #elif ECB_GCC_VERSION(2,5) |
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165 | #define ecb_inline static __inline__ |
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166 | #elif ECB_C99 |
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167 | #define ecb_inline static inline |
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168 | #else |
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169 | #define ecb_inline static |
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170 | #endif |
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171 | |
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172 | #if ECB_GCC_VERSION(3,3) |
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173 | #define ecb_restrict __restrict__ |
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174 | #elif ECB_C99 |
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175 | #define ecb_restrict restrict |
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176 | #else |
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177 | #define ecb_restrict |
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178 | #endif |
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179 | |
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180 | typedef int ecb_bool; |
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181 | |
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182 | #define ECB_CONCAT_(a, b) a ## b |
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183 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
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184 | #define ECB_STRINGIFY_(a) # a |
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185 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
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186 | |
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187 | #define ecb_function_ ecb_inline |
| 33 | |
188 | |
| 34 | #if ECB_GCC_VERSION(3,1) |
189 | #if ECB_GCC_VERSION(3,1) |
| 35 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
190 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
| 36 | # define ecb_is_constant(c) __builtin_constant_p (c) |
191 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
| 37 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
192 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
| 38 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
193 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
| 39 | #else |
194 | #else |
| 40 | # define ecb_attribute(attrlist) |
195 | #define ecb_attribute(attrlist) |
| 41 | # define ecb_is_constant(c) 0 |
196 | #define ecb_is_constant(expr) 0 |
| 42 | # define ecb_expect(expr,value) (expr) |
197 | #define ecb_expect(expr,value) (expr) |
| 43 | # define ecb_prefetch(addr,rw,locality) |
198 | #define ecb_prefetch(addr,rw,locality) |
| 44 | #endif |
199 | #endif |
| 45 | |
200 | |
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201 | /* no emulation for ecb_decltype */ |
| 46 | #if ECB_GCC_VERSION(4,5) |
202 | #if ECB_GCC_VERSION(4,5) |
| 47 | # define ecb_decltype(x) __decltype(x) |
203 | #define ecb_decltype(x) __decltype(x) |
| 48 | #elif ECB_GCC_VERSION(3,0) |
204 | #elif ECB_GCC_VERSION(3,0) |
| 49 | # define ecb_decltype(x) typeof(x) |
205 | #define ecb_decltype(x) __typeof(x) |
| 50 | #endif |
206 | #endif |
| 51 | |
207 | |
| 52 | #define ecb_noinline ecb_attribute ((noinline)) |
208 | #define ecb_noinline ecb_attribute ((__noinline__)) |
| 53 | #define ecb_noreturn ecb_attribute ((noreturn)) |
209 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
| 54 | #define ecb_unused ecb_attribute ((unused)) |
210 | #define ecb_unused ecb_attribute ((__unused__)) |
| 55 | #define ecb_const ecb_attribute ((const)) |
211 | #define ecb_const ecb_attribute ((__const__)) |
| 56 | #define ecb_pure ecb_attribute ((pure)) |
212 | #define ecb_pure ecb_attribute ((__pure__)) |
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213 | |
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214 | #if ECB_GCC_VERSION(4,3) |
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215 | #define ecb_artificial ecb_attribute ((__artificial__)) |
| 57 | #define ecb_hot ecb_attribute ((hot)) // 4.3 |
216 | #define ecb_hot ecb_attribute ((__hot__)) |
| 58 | #define ecb_cold ecb_attribute ((cold)) // 4.3 |
217 | #define ecb_cold ecb_attribute ((__cold__)) |
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218 | #else |
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219 | #define ecb_artificial |
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220 | #define ecb_hot |
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221 | #define ecb_cold |
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222 | #endif |
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223 | |
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224 | /* put around conditional expressions if you are very sure that the */ |
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225 | /* expression is mostly true or mostly false. note that these return */ |
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226 | /* booleans, not the expression. */ |
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227 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
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228 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
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229 | /* for compatibility to the rest of the world */ |
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230 | #define ecb_likely(expr) ecb_expect_true (expr) |
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231 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
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232 | |
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233 | /* count trailing zero bits and count # of one bits */ |
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234 | #if ECB_GCC_VERSION(3,4) |
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235 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
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236 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
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237 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
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238 | #define ecb_ctz32(x) __builtin_ctz (x) |
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239 | #define ecb_ctz64(x) __builtin_ctzll (x) |
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240 | #define ecb_popcount32(x) __builtin_popcount (x) |
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241 | /* no popcountll */ |
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242 | #else |
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243 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
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244 | ecb_function_ int |
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245 | ecb_ctz32 (uint32_t x) |
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246 | { |
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247 | int r = 0; |
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248 | |
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249 | x &= ~x + 1; /* this isolates the lowest bit */ |
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250 | |
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251 | #if ECB_branchless_on_i386 |
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252 | r += !!(x & 0xaaaaaaaa) << 0; |
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253 | r += !!(x & 0xcccccccc) << 1; |
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254 | r += !!(x & 0xf0f0f0f0) << 2; |
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255 | r += !!(x & 0xff00ff00) << 3; |
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256 | r += !!(x & 0xffff0000) << 4; |
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257 | #else |
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258 | if (x & 0xaaaaaaaa) r += 1; |
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259 | if (x & 0xcccccccc) r += 2; |
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260 | if (x & 0xf0f0f0f0) r += 4; |
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261 | if (x & 0xff00ff00) r += 8; |
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262 | if (x & 0xffff0000) r += 16; |
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263 | #endif |
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264 | |
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265 | return r; |
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266 | } |
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267 | |
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268 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
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269 | ecb_function_ int |
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270 | ecb_ctz64 (uint64_t x) |
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271 | { |
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272 | int shift = x & 0xffffffffU ? 0 : 32; |
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273 | return ecb_ctz32 (x >> shift) + shift; |
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274 | } |
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275 | |
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276 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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277 | ecb_function_ int |
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278 | ecb_popcount32 (uint32_t x) |
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279 | { |
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280 | x -= (x >> 1) & 0x55555555; |
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281 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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282 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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283 | x *= 0x01010101; |
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284 | |
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285 | return x >> 24; |
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286 | } |
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287 | |
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288 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
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289 | ecb_function_ int ecb_ld32 (uint32_t x) |
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290 | { |
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291 | int r = 0; |
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292 | |
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293 | if (x >> 16) { x >>= 16; r += 16; } |
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294 | if (x >> 8) { x >>= 8; r += 8; } |
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295 | if (x >> 4) { x >>= 4; r += 4; } |
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296 | if (x >> 2) { x >>= 2; r += 2; } |
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297 | if (x >> 1) { r += 1; } |
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298 | |
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299 | return r; |
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300 | } |
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301 | |
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302 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
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303 | ecb_function_ int ecb_ld64 (uint64_t x) |
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304 | { |
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305 | int r = 0; |
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306 | |
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307 | if (x >> 32) { x >>= 32; r += 32; } |
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308 | |
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309 | return r + ecb_ld32 (x); |
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310 | } |
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311 | #endif |
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312 | |
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313 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
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314 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
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315 | { |
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316 | return ( (x * 0x0802U & 0x22110U) |
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317 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
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318 | } |
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319 | |
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320 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
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321 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
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322 | { |
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323 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
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324 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
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325 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
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326 | x = ( x >> 8 ) | ( x << 8); |
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327 | |
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328 | return x; |
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329 | } |
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330 | |
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331 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
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332 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
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333 | { |
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334 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
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335 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
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336 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
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337 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
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338 | x = ( x >> 16 ) | ( x << 16); |
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339 | |
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340 | return x; |
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341 | } |
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342 | |
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343 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
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344 | /* so for this version we are lazy */ |
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345 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
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346 | ecb_function_ int |
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347 | ecb_popcount64 (uint64_t x) |
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348 | { |
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349 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
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350 | } |
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351 | |
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352 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
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353 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
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354 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
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355 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
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356 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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357 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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358 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
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359 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
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360 | |
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361 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
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362 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
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363 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
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364 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
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365 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
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366 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
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367 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
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368 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
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369 | |
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370 | #if ECB_GCC_VERSION(4,3) |
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371 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
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372 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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373 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
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374 | #else |
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375 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
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376 | ecb_function_ uint16_t |
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377 | ecb_bswap16 (uint16_t x) |
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378 | { |
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379 | return ecb_rotl16 (x, 8); |
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380 | } |
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381 | |
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382 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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383 | ecb_function_ uint32_t |
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384 | ecb_bswap32 (uint32_t x) |
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385 | { |
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386 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
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387 | } |
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388 | |
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389 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
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390 | ecb_function_ uint64_t |
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391 | ecb_bswap64 (uint64_t x) |
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392 | { |
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393 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
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394 | } |
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395 | #endif |
| 59 | |
396 | |
| 60 | #if ECB_GCC_VERSION(4,5) |
397 | #if ECB_GCC_VERSION(4,5) |
| 61 | # define ecb_unreachable() __builtin_unreachable () |
398 | #define ecb_unreachable() __builtin_unreachable () |
| 62 | #else |
399 | #else |
| 63 | // this seems to work fine, but gcc always emits a warning for it :/ |
400 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
| 64 | static inline void ecb_unreachable () ecb_attribute ((noreturn)); |
401 | ecb_inline void ecb_unreachable (void) ecb_noreturn; |
| 65 | static inline void ecb_unreachable () { } |
402 | ecb_inline void ecb_unreachable (void) { } |
| 66 | #endif |
403 | #endif |
| 67 | |
404 | |
| 68 | // put into ifs if you are very sure that the expression |
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| 69 | // is mostly true or mosty false. note that these return |
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| 70 | // booleans, not the expression. |
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| 71 | #define ecb_expect_false(expr) ecb_expect ((expr) ? 1 : 0, 0) |
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| 72 | #define ecb_expect_true(expr) ecb_expect ((expr) ? 1 : 0, 1) |
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| 73 | |
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| 74 | // try to tell the compiler that some condition is definitely true |
405 | /* try to tell the compiler that some condition is definitely true */ |
| 75 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
406 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
| 76 | |
407 | |
| 77 | // count trailing zero bits and count # of one bits |
408 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
| 78 | #if ECB_GCC_VERSION(3,4) |
409 | ecb_inline unsigned char |
| 79 | static inline int ecb_ctz (unsigned int x) { return __builtin_ctz (x); } |
410 | ecb_byteorder_helper (void) |
| 80 | static inline int ecb_popcount (unsigned int x) { return __builtin_popcount (x); } |
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| 81 | #else |
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| 82 | static int ecb_ctz (unsigned int x) ecb_const |
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| 83 | { |
411 | { |
| 84 | int r = 0; |
412 | const uint32_t u = 0x11223344; |
| 85 | |
413 | return *(unsigned char *)&u; |
| 86 | x &= -x; // this isolates the lowest bit |
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| 87 | |
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| 88 | if (x & 0xaaaaaaaa) r += 1; |
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| 89 | if (x & 0xcccccccc) r += 2; |
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| 90 | if (x & 0xf0f0f0f0) r += 4; |
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| 91 | if (x & 0xff00ff00) r += 8; |
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| 92 | if (x & 0xffff0000) r += 16; |
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| 93 | |
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| 94 | return r; |
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| 95 | } |
414 | } |
| 96 | |
415 | |
| 97 | static int ecb_popcount (unsigned int x) ecb_const |
416 | ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
| 98 | { |
417 | ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
| 99 | x -= (x >> 1) & 0x55555555; |
418 | ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
| 100 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
419 | ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
| 101 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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| 102 | x *= 0x01010101; |
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| 103 | |
420 | |
| 104 | return x >> 24; |
421 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
| 105 | } |
422 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
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423 | #else |
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424 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
| 106 | #endif |
425 | #endif |
| 107 | |
426 | |
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427 | #if __cplusplus |
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428 | template<typename T> |
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429 | static inline T ecb_div_rd (T val, T div) |
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430 | { |
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431 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
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432 | } |
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433 | template<typename T> |
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434 | static inline T ecb_div_ru (T val, T div) |
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435 | { |
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436 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
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437 | } |
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438 | #else |
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439 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
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440 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
| 108 | #endif |
441 | #endif |
| 109 | |
442 | |
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443 | #if ecb_cplusplus_does_not_suck |
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444 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
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445 | template<typename T, int N> |
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446 | static inline int ecb_array_length (const T (&arr)[N]) |
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447 | { |
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448 | return N; |
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449 | } |
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450 | #else |
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451 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
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452 | #endif |
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453 | |
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454 | #endif |
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455 | |
