| 1 | /* |
1 | /* |
| 2 | * libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann |
4 | * Copyright (©) 2009-2011 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 |
| 32 | #include <inttypes.h> |
48 | #include <inttypes.h> |
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49 | #endif |
| 33 | |
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 |
| 34 | #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 |
| 35 | |
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 || ECB_NO_SMP |
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72 | #define ECB_MEMORY_FENCE do { } while (0) |
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73 | #endif |
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74 | |
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75 | #ifndef ECB_MEMORY_FENCE |
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76 | #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) |
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77 | #if __i386__ |
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78 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
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79 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ |
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80 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
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81 | #elif __amd64 |
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82 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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83 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
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84 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ |
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85 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
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86 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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87 | #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ |
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88 | || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) |
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89 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
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90 | #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \ |
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91 | || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) |
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92 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
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93 | #endif |
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94 | #endif |
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95 | #endif |
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96 | |
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97 | #ifndef ECB_MEMORY_FENCE |
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98 | #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__) |
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99 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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100 | /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
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101 | /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
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102 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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103 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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104 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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105 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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106 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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107 | #elif defined(_WIN32) |
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108 | #include <WinNT.h> |
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109 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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110 | #endif |
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111 | #endif |
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112 | |
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113 | #ifndef ECB_MEMORY_FENCE |
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114 | #if !ECB_AVOID_PTHREADS |
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115 | /* |
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116 | * if you get undefined symbol references to pthread_mutex_lock, |
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117 | * or failure to find pthread.h, then you should implement |
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118 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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119 | * OR provide pthread.h and link against the posix thread library |
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120 | * of your system. |
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121 | */ |
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122 | #include <pthread.h> |
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123 | #define ECB_NEEDS_PTHREADS 1 |
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124 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
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125 | |
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126 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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127 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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128 | #endif |
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129 | #endif |
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130 | |
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131 | #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) |
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132 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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133 | #endif |
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134 | |
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135 | #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) |
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136 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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137 | #endif |
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138 | |
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139 | /*****************************************************************************/ |
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140 | |
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141 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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142 | |
| 36 | #ifndef __cplusplus |
143 | #if __cplusplus |
| 37 | # if __STDC_VERSION__ >= 199901L |
144 | #define ecb_inline static inline |
| 38 | # define ECB_INLINE inline |
145 | #elif ECB_GCC_VERSION(2,5) |
| 39 | typedef _Bool ecb_bool; |
146 | #define ecb_inline static __inline__ |
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147 | #elif ECB_C99 |
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148 | #define ecb_inline static inline |
| 40 | # else |
149 | #else |
| 41 | # define ECB_INLINE inline /* yeah! */ |
150 | #define ecb_inline static |
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151 | #endif |
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152 | |
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153 | #if ECB_GCC_VERSION(3,3) |
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154 | #define ecb_restrict __restrict__ |
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155 | #elif ECB_C99 |
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156 | #define ecb_restrict restrict |
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157 | #else |
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158 | #define ecb_restrict |
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159 | #endif |
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160 | |
| 42 | typedef int ecb_bool; |
161 | typedef int ecb_bool; |
| 43 | # endif |
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| 44 | #endif |
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| 45 | |
162 | |
| 46 | #define ECB_HEADER_INLINE static ECB_INLINE |
163 | #define ECB_CONCAT_(a, b) a ## b |
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164 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
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165 | #define ECB_STRINGIFY_(a) # a |
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166 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
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167 | |
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168 | #define ecb_function_ ecb_inline |
| 47 | |
169 | |
| 48 | #if ECB_GCC_VERSION(3,1) |
170 | #if ECB_GCC_VERSION(3,1) |
| 49 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
171 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
| 50 | # define ecb_is_constant(c) __builtin_constant_p (c) |
172 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
| 51 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
173 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
| 52 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
174 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
| 53 | #else |
175 | #else |
| 54 | # define ecb_attribute(attrlist) |
176 | #define ecb_attribute(attrlist) |
| 55 | # define ecb_is_constant(c) 0 |
177 | #define ecb_is_constant(expr) 0 |
| 56 | # define ecb_expect(expr,value) (expr) |
178 | #define ecb_expect(expr,value) (expr) |
| 57 | # define ecb_prefetch(addr,rw,locality) |
179 | #define ecb_prefetch(addr,rw,locality) |
| 58 | #endif |
180 | #endif |
| 59 | |
181 | |
| 60 | /* no emulation for ecb_decltype */ |
182 | /* no emulation for ecb_decltype */ |
| 61 | #if ECB_GCC_VERSION(4,5) |
183 | #if ECB_GCC_VERSION(4,5) |
| 62 | # define ecb_decltype(x) __decltype(x) |
184 | #define ecb_decltype(x) __decltype(x) |
| 63 | #elif ECB_GCC_VERSION(3,0) |
185 | #elif ECB_GCC_VERSION(3,0) |
| 64 | # define ecb_decltype(x) typeof(x) |
186 | #define ecb_decltype(x) __typeof(x) |
| 65 | #endif |
187 | #endif |
| 66 | |
188 | |
| 67 | #define ecb_noinline ecb_attribute ((noinline)) |
189 | #define ecb_noinline ecb_attribute ((__noinline__)) |
| 68 | #define ecb_noreturn ecb_attribute ((noreturn)) |
190 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
| 69 | #define ecb_unused ecb_attribute ((unused)) |
191 | #define ecb_unused ecb_attribute ((__unused__)) |
| 70 | #define ecb_const ecb_attribute ((const)) |
192 | #define ecb_const ecb_attribute ((__const__)) |
| 71 | #define ecb_pure ecb_attribute ((pure)) |
193 | #define ecb_pure ecb_attribute ((__pure__)) |
| 72 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
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| 73 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
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| 74 | |
194 | |
| 75 | #if ECB_GCC_VERSION(4,5) |
195 | #if ECB_GCC_VERSION(4,3) |
| 76 | # define ecb_unreachable() __builtin_unreachable () |
196 | #define ecb_artificial ecb_attribute ((__artificial__)) |
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197 | #define ecb_hot ecb_attribute ((__hot__)) |
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198 | #define ecb_cold ecb_attribute ((__cold__)) |
| 77 | #else |
199 | #else |
| 78 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
200 | #define ecb_artificial |
| 79 | ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); |
201 | #define ecb_hot |
| 80 | ECB_HEADER_INLINE void ecb_unreachable () { } |
202 | #define ecb_cold |
| 81 | #endif |
203 | #endif |
| 82 | |
204 | |
| 83 | /* put into ifs if you are very sure that the expression */ |
205 | /* put around conditional expressions if you are very sure that the */ |
| 84 | /* is mostly true or mosty false. note that these return */ |
206 | /* expression is mostly true or mostly false. note that these return */ |
| 85 | /* booleans, not the expression. */ |
207 | /* booleans, not the expression. */ |
| 86 | #define ecb_unlikely(expr) ecb_expect ((expr) ? 1 : 0, 0) |
208 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
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209 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
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210 | /* for compatibility to the rest of the world */ |
| 87 | #define ecb_likely(expr) ecb_expect ((expr) ? 1 : 0, 1) |
211 | #define ecb_likely(expr) ecb_expect_true (expr) |
| 88 | |
212 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
| 89 | /* try to tell the compiler that some condition is definitely true */ |
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| 90 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
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| 91 | |
213 | |
| 92 | /* count trailing zero bits and count # of one bits */ |
214 | /* count trailing zero bits and count # of one bits */ |
| 93 | #if ECB_GCC_VERSION(3,4) |
215 | #if ECB_GCC_VERSION(3,4) |
| 94 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } |
216 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
| 95 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } |
217 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
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218 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
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219 | #define ecb_ctz32(x) __builtin_ctz (x) |
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220 | #define ecb_ctz64(x) __builtin_ctzll (x) |
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221 | #define ecb_popcount32(x) __builtin_popcount (x) |
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222 | /* no popcountll */ |
| 96 | #else |
223 | #else |
| 97 | ECB_HEADER_INLINE |
224 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
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225 | ecb_function_ int |
| 98 | ecb_ctz32 (uint32_t x) ecb_const |
226 | ecb_ctz32 (uint32_t x) |
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227 | { |
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228 | int r = 0; |
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229 | |
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230 | x &= ~x + 1; /* this isolates the lowest bit */ |
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231 | |
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232 | #if ECB_branchless_on_i386 |
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233 | r += !!(x & 0xaaaaaaaa) << 0; |
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234 | r += !!(x & 0xcccccccc) << 1; |
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235 | r += !!(x & 0xf0f0f0f0) << 2; |
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236 | r += !!(x & 0xff00ff00) << 3; |
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237 | r += !!(x & 0xffff0000) << 4; |
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238 | #else |
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239 | if (x & 0xaaaaaaaa) r += 1; |
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240 | if (x & 0xcccccccc) r += 2; |
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241 | if (x & 0xf0f0f0f0) r += 4; |
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242 | if (x & 0xff00ff00) r += 8; |
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243 | if (x & 0xffff0000) r += 16; |
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244 | #endif |
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245 | |
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246 | return r; |
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247 | } |
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248 | |
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249 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
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250 | ecb_function_ int |
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251 | ecb_ctz64 (uint64_t x) |
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252 | { |
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253 | int shift = x & 0xffffffffU ? 0 : 32; |
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254 | return ecb_ctz32 (x >> shift) + shift; |
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255 | } |
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256 | |
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257 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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258 | ecb_function_ int |
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259 | ecb_popcount32 (uint32_t x) |
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260 | { |
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261 | x -= (x >> 1) & 0x55555555; |
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262 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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263 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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264 | x *= 0x01010101; |
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265 | |
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266 | return x >> 24; |
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267 | } |
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268 | |
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269 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
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270 | ecb_function_ int ecb_ld32 (uint32_t x) |
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271 | { |
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272 | int r = 0; |
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273 | |
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274 | if (x >> 16) { x >>= 16; r += 16; } |
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275 | if (x >> 8) { x >>= 8; r += 8; } |
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276 | if (x >> 4) { x >>= 4; r += 4; } |
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277 | if (x >> 2) { x >>= 2; r += 2; } |
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278 | if (x >> 1) { r += 1; } |
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279 | |
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280 | return r; |
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281 | } |
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282 | |
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283 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
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284 | ecb_function_ int ecb_ld64 (uint64_t x) |
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285 | { |
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286 | int r = 0; |
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287 | |
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288 | if (x >> 32) { x >>= 32; r += 32; } |
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289 | |
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290 | return r + ecb_ld32 (x); |
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291 | } |
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292 | #endif |
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293 | |
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294 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
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295 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
| 99 | { |
296 | { |
| 100 | int r = 0; |
297 | return ( (x * 0x0802U & 0x22110U) |
| 101 | |
298 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
| 102 | x &= -x; /* this isolates the lowest bit */ |
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| 103 | |
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| 104 | if (x & 0xaaaaaaaa) r += 1; |
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| 105 | if (x & 0xcccccccc) r += 2; |
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| 106 | if (x & 0xf0f0f0f0) r += 4; |
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| 107 | if (x & 0xff00ff00) r += 8; |
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| 108 | if (x & 0xffff0000) r += 16; |
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| 109 | |
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| 110 | return r; |
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| 111 | } |
299 | } |
| 112 | |
300 | |
| 113 | ECB_HEADER_INLINE |
301 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
| 114 | ecb_popcount32 (uint32_t x) ecb_const |
302 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
| 115 | { |
303 | { |
| 116 | x -= (x >> 1) & 0x55555555; |
304 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
| 117 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
305 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
| 118 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
306 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
| 119 | x *= 0x01010101; |
307 | x = ( x >> 8 ) | ( x << 8); |
| 120 | |
308 | |
| 121 | return x >> 24; |
309 | return x; |
| 122 | } |
310 | } |
| 123 | #endif |
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| 124 | |
311 | |
| 125 | ECB_HEADER_INLINE unsigned char |
312 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
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313 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
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314 | { |
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315 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
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316 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
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317 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
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318 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
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319 | x = ( x >> 16 ) | ( x << 16); |
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320 | |
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321 | return x; |
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322 | } |
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323 | |
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324 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
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325 | /* so for this version we are lazy */ |
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326 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
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327 | ecb_function_ int |
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328 | ecb_popcount64 (uint64_t x) |
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329 | { |
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330 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
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331 | } |
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332 | |
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333 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
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334 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
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335 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
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336 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
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337 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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338 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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339 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
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340 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
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341 | |
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342 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
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343 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
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344 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
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345 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
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346 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
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347 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
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348 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
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349 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
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350 | |
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351 | #if ECB_GCC_VERSION(4,3) |
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352 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
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353 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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354 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
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355 | #else |
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356 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
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357 | ecb_function_ uint16_t |
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358 | ecb_bswap16 (uint16_t x) |
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359 | { |
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360 | return ecb_rotl16 (x, 8); |
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361 | } |
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362 | |
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363 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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364 | ecb_function_ uint32_t |
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365 | ecb_bswap32 (uint32_t x) |
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366 | { |
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367 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
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368 | } |
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369 | |
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370 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
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371 | ecb_function_ uint64_t |
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372 | ecb_bswap64 (uint64_t x) |
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373 | { |
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374 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
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375 | } |
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376 | #endif |
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377 | |
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378 | #if ECB_GCC_VERSION(4,5) |
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379 | #define ecb_unreachable() __builtin_unreachable () |
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380 | #else |
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381 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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382 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
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383 | ecb_function_ void ecb_unreachable (void) { } |
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384 | #endif |
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385 | |
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386 | /* try to tell the compiler that some condition is definitely true */ |
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387 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
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388 | |
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389 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
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390 | ecb_function_ unsigned char |
| 126 | ecb_byteorder_helper () ecb_const |
391 | ecb_byteorder_helper (void) |
| 127 | { |
392 | { |
| 128 | const uint32_t u = 0x11223344; |
393 | const uint32_t u = 0x11223344; |
| 129 | return *(unsigned char *)&u; |
394 | return *(unsigned char *)&u; |
| 130 | } |
395 | } |
| 131 | |
396 | |
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397 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
| 132 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; |
398 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
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399 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
| 133 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; |
400 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
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401 | |
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402 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
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403 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
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404 | #else |
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405 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
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406 | #endif |
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407 | |
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408 | #if __cplusplus |
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409 | template<typename T> |
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410 | static inline T ecb_div_rd (T val, T div) |
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411 | { |
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412 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
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413 | } |
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414 | template<typename T> |
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415 | static inline T ecb_div_ru (T val, T div) |
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416 | { |
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417 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
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418 | } |
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419 | #else |
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420 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
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421 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
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422 | #endif |
| 134 | |
423 | |
| 135 | #if ecb_cplusplus_does_not_suck |
424 | #if ecb_cplusplus_does_not_suck |
| 136 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
425 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
| 137 | template<typename T, int N> |
426 | template<typename T, int N> |
| 138 | static inline int array_length (const T (&arr)[N]) |
427 | static inline int ecb_array_length (const T (&arr)[N]) |
| 139 | { |
428 | { |
| 140 | return N; |
429 | return N; |
| 141 | } |
430 | } |
| 142 | #else |
431 | #else |
| 143 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
432 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
| 144 | #endif |
433 | #endif |
| 145 | |
434 | |
| 146 | ECB_INLINE uint32_t |
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| 147 | ecb_rotate32_right (uint32_t c, unsigned int count = 1) |
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| 148 | { |
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| 149 | return (c << (32 - count)) | (c >> count); |
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| 150 | } |
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| 151 | |
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| 152 | ECB_INLINE uint32_t |
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| 153 | ecb_rotate32_left (uint32_t c, unsigned int count = 1) |
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| 154 | { |
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| 155 | return (c >> (32 - count)) | (c << count); |
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| 156 | } |
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| 157 | |
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| 158 | #endif |
435 | #endif |
| 159 | |
436 | |
