1 | /* |
1 | /* |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
3 | * |
3 | * |
4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de> |
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: |
… | |
… | |
38 | typedef signed int int32_t; |
38 | typedef signed int int32_t; |
39 | typedef unsigned int uint32_t; |
39 | typedef unsigned int uint32_t; |
40 | #if __GNUC__ |
40 | #if __GNUC__ |
41 | typedef signed long long int64_t; |
41 | typedef signed long long int64_t; |
42 | typedef unsigned long long uint64_t; |
42 | typedef unsigned long long uint64_t; |
43 | #else |
43 | #else /* _MSC_VER || __BORLANDC__ */ |
44 | typedef signed __int64 int64_t; |
44 | typedef signed __int64 int64_t; |
45 | typedef unsigned __int64 uint64_t; |
45 | typedef unsigned __int64 uint64_t; |
46 | #endif |
46 | #endif |
47 | #else |
47 | #else |
48 | #include <inttypes.h> |
48 | #include <inttypes.h> |
49 | #endif |
49 | #endif |
50 | |
50 | |
51 | /* many compilers define _GNUC_ to some versions but then only implement |
51 | /* many compilers define _GNUC_ to some versions but then only implement |
52 | * what their idiot authors think are the "more important" extensions, |
52 | * what their idiot authors think are the "more important" extensions, |
53 | * causing enourmous grief in return for some better fake benchmark numbers. |
53 | * causing enormous grief in return for some better fake benchmark numbers. |
54 | * or so. |
54 | * or so. |
55 | * we try to detect these and simply assume they are not gcc - if they have |
55 | * we try to detect these and simply assume they are not gcc - if they have |
56 | * an issue with that they should have done it right in the first place. |
56 | * an issue with that they should have done it right in the first place. |
57 | */ |
57 | */ |
58 | #ifndef ECB_GCC_VERSION |
58 | #ifndef ECB_GCC_VERSION |
… | |
… | |
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 | #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__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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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 | #elif defined(__sparc) |
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94 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #StoreLoad | #LoadLoad | #StoreStore" : : : "memory") |
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95 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadLoad" : : : "memory") |
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96 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #StoreStore") |
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97 | #endif |
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98 | #endif |
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99 | #endif |
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100 | |
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101 | #ifndef ECB_MEMORY_FENCE |
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102 | #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__) |
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103 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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104 | /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
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105 | /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
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106 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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107 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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108 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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109 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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110 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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111 | #elif defined(_WIN32) |
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112 | #include <WinNT.h> |
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113 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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114 | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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115 | #include <mbarrier.h> |
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116 | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
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117 | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
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118 | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
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119 | #endif |
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120 | #endif |
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121 | |
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122 | #ifndef ECB_MEMORY_FENCE |
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123 | #if !ECB_AVOID_PTHREADS |
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124 | /* |
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125 | * if you get undefined symbol references to pthread_mutex_lock, |
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126 | * or failure to find pthread.h, then you should implement |
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127 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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128 | * OR provide pthread.h and link against the posix thread library |
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129 | * of your system. |
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130 | */ |
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131 | #include <pthread.h> |
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132 | #define ECB_NEEDS_PTHREADS 1 |
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133 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
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134 | |
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135 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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136 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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137 | #endif |
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138 | #endif |
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139 | |
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140 | #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) |
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141 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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142 | #endif |
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143 | |
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144 | #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) |
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145 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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146 | #endif |
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147 | |
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148 | /*****************************************************************************/ |
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149 | |
66 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
150 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
67 | |
151 | |
68 | #if __cplusplus |
152 | #if __cplusplus |
69 | #define ecb_inline static inline |
153 | #define ecb_inline static inline |
70 | #elif ECB_GCC_VERSION(2,5) |
154 | #elif ECB_GCC_VERSION(2,5) |
… | |
… | |
136 | #define ecb_likely(expr) ecb_expect_true (expr) |
220 | #define ecb_likely(expr) ecb_expect_true (expr) |
137 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
221 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
138 | |
222 | |
139 | /* count trailing zero bits and count # of one bits */ |
223 | /* count trailing zero bits and count # of one bits */ |
140 | #if ECB_GCC_VERSION(3,4) |
224 | #if ECB_GCC_VERSION(3,4) |
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225 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
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226 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
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227 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
141 | #define ecb_ctz32(x) __builtin_ctz (x) |
228 | #define ecb_ctz32(x) __builtin_ctz (x) |
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229 | #define ecb_ctz64(x) __builtin_ctzll (x) |
142 | #define ecb_popcount32(x) __builtin_popcount (x) |
230 | #define ecb_popcount32(x) __builtin_popcount (x) |
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231 | /* no popcountll */ |
143 | #else |
232 | #else |
144 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
233 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
145 | ecb_function_ int |
234 | ecb_function_ int |
146 | ecb_ctz32 (uint32_t x) |
235 | ecb_ctz32 (uint32_t x) |
147 | { |
236 | { |
148 | int r = 0; |
237 | int r = 0; |
149 | |
238 | |
150 | x &= (uint32_t)-(int32_t)x; /* this isolates the lowest bit */ |
239 | x &= ~x + 1; /* this isolates the lowest bit */ |
151 | |
240 | |
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241 | #if ECB_branchless_on_i386 |
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242 | r += !!(x & 0xaaaaaaaa) << 0; |
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243 | r += !!(x & 0xcccccccc) << 1; |
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244 | r += !!(x & 0xf0f0f0f0) << 2; |
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245 | r += !!(x & 0xff00ff00) << 3; |
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246 | r += !!(x & 0xffff0000) << 4; |
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247 | #else |
152 | if (x & 0xaaaaaaaa) r += 1; |
248 | if (x & 0xaaaaaaaa) r += 1; |
153 | if (x & 0xcccccccc) r += 2; |
249 | if (x & 0xcccccccc) r += 2; |
154 | if (x & 0xf0f0f0f0) r += 4; |
250 | if (x & 0xf0f0f0f0) r += 4; |
155 | if (x & 0xff00ff00) r += 8; |
251 | if (x & 0xff00ff00) r += 8; |
156 | if (x & 0xffff0000) r += 16; |
252 | if (x & 0xffff0000) r += 16; |
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253 | #endif |
157 | |
254 | |
158 | return r; |
255 | return r; |
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256 | } |
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257 | |
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258 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
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259 | ecb_function_ int |
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260 | ecb_ctz64 (uint64_t x) |
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261 | { |
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262 | int shift = x & 0xffffffffU ? 0 : 32; |
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263 | return ecb_ctz32 (x >> shift) + shift; |
159 | } |
264 | } |
160 | |
265 | |
161 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
266 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
162 | ecb_function_ int |
267 | ecb_function_ int |
163 | ecb_popcount32 (uint32_t x) |
268 | ecb_popcount32 (uint32_t x) |
… | |
… | |
167 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
272 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
168 | x *= 0x01010101; |
273 | x *= 0x01010101; |
169 | |
274 | |
170 | return x >> 24; |
275 | return x >> 24; |
171 | } |
276 | } |
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277 | |
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278 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
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279 | ecb_function_ int ecb_ld32 (uint32_t x) |
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280 | { |
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281 | int r = 0; |
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282 | |
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283 | if (x >> 16) { x >>= 16; r += 16; } |
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284 | if (x >> 8) { x >>= 8; r += 8; } |
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285 | if (x >> 4) { x >>= 4; r += 4; } |
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286 | if (x >> 2) { x >>= 2; r += 2; } |
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287 | if (x >> 1) { r += 1; } |
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288 | |
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289 | return r; |
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290 | } |
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291 | |
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292 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
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293 | ecb_function_ int ecb_ld64 (uint64_t x) |
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294 | { |
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295 | int r = 0; |
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296 | |
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297 | if (x >> 32) { x >>= 32; r += 32; } |
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298 | |
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299 | return r + ecb_ld32 (x); |
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300 | } |
172 | #endif |
301 | #endif |
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302 | |
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303 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
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304 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
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305 | { |
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306 | return ( (x * 0x0802U & 0x22110U) |
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307 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
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308 | } |
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309 | |
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310 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
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311 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
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312 | { |
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313 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
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314 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
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315 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
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316 | x = ( x >> 8 ) | ( x << 8); |
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317 | |
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318 | return x; |
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319 | } |
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320 | |
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321 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
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322 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
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323 | { |
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324 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
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325 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
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326 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
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327 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
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328 | x = ( x >> 16 ) | ( x << 16); |
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329 | |
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330 | return x; |
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331 | } |
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332 | |
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333 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
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334 | /* so for this version we are lazy */ |
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335 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
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336 | ecb_function_ int |
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337 | ecb_popcount64 (uint64_t x) |
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338 | { |
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339 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
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340 | } |
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341 | |
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342 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
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343 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
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344 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
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345 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
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346 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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347 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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348 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
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349 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
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350 | |
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351 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
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352 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
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353 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
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354 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
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355 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
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356 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
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357 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
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358 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
173 | |
359 | |
174 | #if ECB_GCC_VERSION(4,3) |
360 | #if ECB_GCC_VERSION(4,3) |
175 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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176 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
361 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
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362 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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363 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
177 | #else |
364 | #else |
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365 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
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366 | ecb_function_ uint16_t |
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367 | ecb_bswap16 (uint16_t x) |
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368 | { |
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369 | return ecb_rotl16 (x, 8); |
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370 | } |
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371 | |
178 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
372 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
179 | ecb_function_ uint32_t |
373 | ecb_function_ uint32_t |
180 | ecb_bswap32 (uint32_t x) |
374 | ecb_bswap32 (uint32_t x) |
181 | { |
375 | { |
182 | return (x >> 24) |
376 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
183 | | ((x >> 8) & 0x0000ff00) |
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184 | | ((x << 8) & 0x00ff0000) |
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185 | | (x << 24); |
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186 | } |
377 | } |
187 | |
378 | |
188 | ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
379 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
189 | ecb_function_ uint32_t |
380 | ecb_function_ uint64_t |
190 | ecb_bswap16 (uint32_t x) |
381 | ecb_bswap64 (uint64_t x) |
191 | { |
382 | { |
192 | return ((x >> 8) & 0xff) |
383 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
193 | | ((x << 8) & 0x00ff0000) |
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194 | | (x << 24); |
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195 | } |
384 | } |
196 | #endif |
385 | #endif |
197 | |
386 | |
198 | #if ECB_GCC_VERSION(4,5) |
387 | #if ECB_GCC_VERSION(4,5) |
199 | #define ecb_unreachable() __builtin_unreachable () |
388 | #define ecb_unreachable() __builtin_unreachable () |
… | |
… | |
223 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
412 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
224 | #else |
413 | #else |
225 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
414 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
226 | #endif |
415 | #endif |
227 | |
416 | |
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417 | #if __cplusplus |
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418 | template<typename T> |
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419 | static inline T ecb_div_rd (T val, T div) |
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420 | { |
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421 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
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422 | } |
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423 | template<typename T> |
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424 | static inline T ecb_div_ru (T val, T div) |
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425 | { |
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426 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
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427 | } |
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428 | #else |
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429 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
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430 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
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431 | #endif |
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432 | |
228 | #if ecb_cplusplus_does_not_suck |
433 | #if ecb_cplusplus_does_not_suck |
229 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
434 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
230 | template<typename T, int N> |
435 | template<typename T, int N> |
231 | static inline int ecb_array_length (const T (&arr)[N]) |
436 | static inline int ecb_array_length (const T (&arr)[N]) |
232 | { |
437 | { |
… | |
… | |
234 | } |
439 | } |
235 | #else |
440 | #else |
236 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
441 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
237 | #endif |
442 | #endif |
238 | |
443 | |
239 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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240 | ecb_inline uint32_t |
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241 | ecb_rotr32 (uint32_t x, unsigned int count) |
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242 | { |
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243 | return (x << (32 - count)) | (x >> count); |
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244 | } |
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245 | |
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246 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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247 | ecb_inline uint32_t |
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248 | ecb_rotl32 (uint32_t x, unsigned int count) |
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249 | { |
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250 | return (x >> (32 - count)) | (x << count); |
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251 | } |
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252 | |
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253 | #endif |
444 | #endif |
254 | |
445 | |