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: |
… | |
… | |
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 |
… | |
… | |
63 | #endif |
63 | #endif |
64 | #endif |
64 | #endif |
65 | |
65 | |
66 | /*****************************************************************************/ |
66 | /*****************************************************************************/ |
67 | |
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 | |
68 | #ifndef ECB_MEMORY_FENCE |
79 | #ifndef ECB_MEMORY_FENCE |
69 | #if ECB_GCC_VERSION(2,5) |
80 | #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
70 | #if __x86 |
81 | #if __i386 || __i386__ |
71 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
82 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
72 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
83 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ |
73 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE /* better be safe than sorry */ |
84 | #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
74 | #elif __amd64 |
85 | #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ |
75 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
86 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
76 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
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__ |
77 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") |
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") |
78 | #endif |
103 | #endif |
79 | #endif |
104 | #endif |
80 | #endif |
105 | #endif |
81 | |
106 | |
82 | #ifndef ECB_MEMORY_FENCE |
107 | #ifndef ECB_MEMORY_FENCE |
83 | #if ECB_GCC_VERSION(4,4) |
108 | #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__) |
84 | #define ECB_MEMORY_FENCE __sync_synchronize () |
109 | #define ECB_MEMORY_FENCE __sync_synchronize () |
85 | #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) |
110 | /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
86 | #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) |
111 | /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
87 | #elif _MSC_VER >= 1400 && 0 /* TODO: only true when using volatiles */ |
112 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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113 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
88 | #define ECB_MEMORY_FENCE do { } while (0) |
114 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
89 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
115 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
90 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
116 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
91 | #elif defined(_WIN32) |
117 | #elif defined(_WIN32) |
92 | #include <WinNT.h> |
118 | #include <WinNT.h> |
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119 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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120 | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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121 | #include <mbarrier.h> |
93 | #define ECB_MEMORY_FENCE MemoryBarrier () |
122 | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
94 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
123 | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
95 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
124 | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
96 | #endif |
125 | #endif |
97 | #endif |
126 | #endif |
98 | |
127 | |
99 | #ifndef ECB_MEMORY_FENCE |
128 | #ifndef ECB_MEMORY_FENCE |
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129 | #if !ECB_AVOID_PTHREADS |
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130 | /* |
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131 | * if you get undefined symbol references to pthread_mutex_lock, |
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132 | * or failure to find pthread.h, then you should implement |
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133 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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134 | * OR provide pthread.h and link against the posix thread library |
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135 | * of your system. |
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136 | */ |
100 | #include <pthread.h> |
137 | #include <pthread.h> |
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138 | #define ECB_NEEDS_PTHREADS 1 |
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139 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
101 | |
140 | |
102 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
141 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
103 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
142 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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143 | #endif |
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144 | #endif |
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145 | |
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146 | #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) |
104 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
147 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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148 | #endif |
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149 | |
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150 | #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) |
105 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
151 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
106 | #endif |
152 | #endif |
107 | |
153 | |
108 | /*****************************************************************************/ |
154 | /*****************************************************************************/ |
109 | |
155 | |
… | |
… | |
233 | x *= 0x01010101; |
279 | x *= 0x01010101; |
234 | |
280 | |
235 | return x >> 24; |
281 | return x >> 24; |
236 | } |
282 | } |
237 | |
283 | |
238 | /* you have the choice beetween something with a table lookup, */ |
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239 | /* something using lots of bit arithmetic and a simple loop */ |
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240 | /* we went for the loop */ |
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241 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
284 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
242 | ecb_function_ int ecb_ld32 (uint32_t x) |
285 | ecb_function_ int ecb_ld32 (uint32_t x) |
243 | { |
286 | { |
244 | int r = 0; |
287 | int r = 0; |
245 | |
288 | |
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260 | if (x >> 32) { x >>= 32; r += 32; } |
303 | if (x >> 32) { x >>= 32; r += 32; } |
261 | |
304 | |
262 | return r + ecb_ld32 (x); |
305 | return r + ecb_ld32 (x); |
263 | } |
306 | } |
264 | #endif |
307 | #endif |
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308 | |
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309 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
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310 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
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311 | { |
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312 | return ( (x * 0x0802U & 0x22110U) |
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313 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
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314 | } |
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315 | |
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316 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
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317 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
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318 | { |
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319 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
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320 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
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321 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
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322 | x = ( x >> 8 ) | ( x << 8); |
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323 | |
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324 | return x; |
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325 | } |
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326 | |
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327 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
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328 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
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329 | { |
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330 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
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331 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
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332 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
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333 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
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334 | x = ( x >> 16 ) | ( x << 16); |
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335 | |
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336 | return x; |
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337 | } |
265 | |
338 | |
266 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
339 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
267 | /* so for this version we are lazy */ |
340 | /* so for this version we are lazy */ |
268 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
341 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
269 | ecb_function_ int |
342 | ecb_function_ int |
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319 | |
392 | |
320 | #if ECB_GCC_VERSION(4,5) |
393 | #if ECB_GCC_VERSION(4,5) |
321 | #define ecb_unreachable() __builtin_unreachable () |
394 | #define ecb_unreachable() __builtin_unreachable () |
322 | #else |
395 | #else |
323 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
396 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
324 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
397 | ecb_inline void ecb_unreachable (void) ecb_noreturn; |
325 | ecb_function_ void ecb_unreachable (void) { } |
398 | ecb_inline void ecb_unreachable (void) { } |
326 | #endif |
399 | #endif |
327 | |
400 | |
328 | /* try to tell the compiler that some condition is definitely true */ |
401 | /* try to tell the compiler that some condition is definitely true */ |
329 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
402 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
330 | |
403 | |
331 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
404 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
332 | ecb_function_ unsigned char |
405 | ecb_inline unsigned char |
333 | ecb_byteorder_helper (void) |
406 | ecb_byteorder_helper (void) |
334 | { |
407 | { |
335 | const uint32_t u = 0x11223344; |
408 | const uint32_t u = 0x11223344; |
336 | return *(unsigned char *)&u; |
409 | return *(unsigned char *)&u; |
337 | } |
410 | } |
338 | |
411 | |
339 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
412 | ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
340 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
413 | ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
341 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
414 | ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
342 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
415 | ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
343 | |
416 | |
344 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
417 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
345 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
418 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
346 | #else |
419 | #else |
347 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
420 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
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421 | #endif |
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422 | |
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423 | #if __cplusplus |
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424 | template<typename T> |
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425 | static inline T ecb_div_rd (T val, T div) |
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426 | { |
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427 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
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428 | } |
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429 | template<typename T> |
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430 | static inline T ecb_div_ru (T val, T div) |
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431 | { |
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432 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
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433 | } |
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434 | #else |
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435 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
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436 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
348 | #endif |
437 | #endif |
349 | |
438 | |
350 | #if ecb_cplusplus_does_not_suck |
439 | #if ecb_cplusplus_does_not_suck |
351 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
440 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
352 | template<typename T, int N> |
441 | template<typename T, int N> |