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| 61 | #else |
61 | #else |
| 62 | #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))) |
| 63 | #endif |
63 | #endif |
| 64 | #endif |
64 | #endif |
| 65 | |
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 | #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0) |
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74 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) |
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75 | #endif |
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76 | |
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77 | #ifndef ECB_MEMORY_FENCE |
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78 | #if ECB_GCC_VERSION(2,5) |
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79 | #if __x86 |
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80 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
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81 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ |
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82 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
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83 | #elif __amd64 |
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84 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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85 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
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86 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ |
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87 | #endif |
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88 | #endif |
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89 | #endif |
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90 | |
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91 | #ifndef ECB_MEMORY_FENCE |
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92 | #if ECB_GCC_VERSION(4,4) |
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93 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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94 | #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) |
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95 | #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) |
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96 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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97 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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98 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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99 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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100 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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101 | #elif defined(_WIN32) |
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102 | #include <WinNT.h> |
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103 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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104 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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105 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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106 | #endif |
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107 | #endif |
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108 | |
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109 | #ifndef ECB_MEMORY_FENCE |
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110 | /* |
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111 | * if you get undefined symbol references to pthread_mutex_lock, |
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112 | * or failure to find pthread.h, then you should implement |
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113 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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114 | * OR proide pthread.h and link against the posix thread library |
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115 | * of your system. |
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116 | */ |
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117 | #include <pthread.h> |
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118 | |
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119 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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120 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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121 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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122 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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123 | #endif |
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124 | |
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125 | /*****************************************************************************/ |
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126 | |
| 66 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
127 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
| 67 | |
128 | |
| 68 | #if __cplusplus |
129 | #if __cplusplus |
| 69 | #define ecb_inline static inline |
130 | #define ecb_inline static inline |
| 70 | #elif ECB_GCC_VERSION(2,5) |
131 | #elif ECB_GCC_VERSION(2,5) |
| … | |
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| 189 | x *= 0x01010101; |
250 | x *= 0x01010101; |
| 190 | |
251 | |
| 191 | return x >> 24; |
252 | return x >> 24; |
| 192 | } |
253 | } |
| 193 | |
254 | |
| 194 | /* you have the choice beetween something with a table lookup, */ |
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| 195 | /* something using lots of bit arithmetic and a simple loop */ |
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| 196 | /* we went for the loop */ |
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| 197 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
255 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
| 198 | ecb_function_ int ecb_ld32 (uint32_t x) |
256 | ecb_function_ int ecb_ld32 (uint32_t x) |
| 199 | { |
257 | { |
| 200 | int r = 0; |
258 | int r = 0; |
| 201 | |
259 | |
