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Comparing libecb/ecb.h (file contents):
Revision 1.1 by root, Thu May 26 16:41:12 2011 UTC vs.
Revision 1.87 by root, Mon May 28 08:28:26 2012 UTC

1/* 1/*
2 * libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (c) 2011 Marc Alexander Lehmann 4 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
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
33/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010001
35
36#ifdef _WIN32
37 typedef signed char int8_t;
38 typedef unsigned char uint8_t;
39 typedef signed short int16_t;
40 typedef unsigned short uint16_t;
41 typedef signed int int32_t;
42 typedef unsigned int uint32_t;
43 #if __GNUC__
44 typedef signed long long int64_t;
45 typedef unsigned long long uint64_t;
46 #else /* _MSC_VER || __BORLANDC__ */
47 typedef signed __int64 int64_t;
48 typedef unsigned __int64 uint64_t;
49 #endif
50 #ifdef _WIN64
51 #define ECB_PTRSIZE 8
52 typedef uint64_t uintptr_t;
53 typedef int64_t intptr_t;
54 #else
55 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t;
58 #endif
59#else
60 #include <inttypes.h>
61 #if UINTMAX_MAX > 0xffffffffU
62 #define ECB_PTRSIZE 8
63 #else
64 #define ECB_PTRSIZE 4
65 #endif
66#endif
67
68/* many compilers define _GNUC_ to some versions but then only implement
69 * what their idiot authors think are the "more important" extensions,
70 * causing enormous grief in return for some better fake benchmark numbers.
71 * or so.
72 * we try to detect these and simply assume they are not gcc - if they have
73 * an issue with that they should have done it right in the first place.
74 */
75#ifndef ECB_GCC_VERSION
76 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
77 #define ECB_GCC_VERSION(major,minor) 0
78 #else
32#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 79 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
80 #endif
81#endif
82
83/*****************************************************************************/
84
85/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
86/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
87
88#if ECB_NO_THREADS
89# define ECB_NO_SMP 1
90#endif
91
92#if ECB_NO_THREADS || ECB_NO_SMP
93 #define ECB_MEMORY_FENCE do { } while (0)
94#endif
95
96#ifndef ECB_MEMORY_FENCE
97 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
98 #if __i386 || __i386__
99 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
100 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
101 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
102 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
103 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
104 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
105 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
106 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
107 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
108 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
109 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
110 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
111 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
112 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
113 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
114 #elif __sparc || __sparc__
115 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
116 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
117 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
118 #elif defined __s390__ || defined __s390x__
119 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
120 #elif defined __mips__
121 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
122 #elif defined __alpha__
123 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
124 #endif
125 #endif
126#endif
127
128#ifndef ECB_MEMORY_FENCE
129 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
130 #define ECB_MEMORY_FENCE __sync_synchronize ()
131 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
132 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
133 #elif _MSC_VER >= 1400 /* VC++ 2005 */
134 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
135 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
136 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
137 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
138 #elif defined _WIN32
139 #include <WinNT.h>
140 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
141 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
142 #include <mbarrier.h>
143 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
144 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
145 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
146 #elif __xlC__
147 #define ECB_MEMORY_FENCE __sync ()
148 #endif
149#endif
150
151#ifndef ECB_MEMORY_FENCE
152 #if !ECB_AVOID_PTHREADS
153 /*
154 * if you get undefined symbol references to pthread_mutex_lock,
155 * or failure to find pthread.h, then you should implement
156 * the ECB_MEMORY_FENCE operations for your cpu/compiler
157 * OR provide pthread.h and link against the posix thread library
158 * of your system.
159 */
160 #include <pthread.h>
161 #define ECB_NEEDS_PTHREADS 1
162 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
163
164 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
165 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
166 #endif
167#endif
168
169#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
170 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
171#endif
172
173#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
174 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
175#endif
176
177/*****************************************************************************/
178
179#define ECB_C99 (__STDC_VERSION__ >= 199901L)
180
181#if __cplusplus
182 #define ecb_inline static inline
183#elif ECB_GCC_VERSION(2,5)
184 #define ecb_inline static __inline__
185#elif ECB_C99
186 #define ecb_inline static inline
187#else
188 #define ecb_inline static
189#endif
190
191#if ECB_GCC_VERSION(3,3)
192 #define ecb_restrict __restrict__
193#elif ECB_C99
194 #define ecb_restrict restrict
195#else
196 #define ecb_restrict
197#endif
198
199typedef int ecb_bool;
200
201#define ECB_CONCAT_(a, b) a ## b
202#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
203#define ECB_STRINGIFY_(a) # a
204#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
205
206#define ecb_function_ ecb_inline
33 207
34#if ECB_GCC_VERSION(3,1) 208#if ECB_GCC_VERSION(3,1)
35# define ecb_attribute(attrlist) __attribute__(attrlist) 209 #define ecb_attribute(attrlist) __attribute__(attrlist)
36# define ecb_is_constant(c) __builtin_constant_p (c) 210 #define ecb_is_constant(expr) __builtin_constant_p (expr)
37# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 211 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
38# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 212 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
39#else 213#else
40# define ecb_attribute(attrlist) 214 #define ecb_attribute(attrlist)
41# define ecb_is_constant(c) 0 215 #define ecb_is_constant(expr) 0
42# define ecb_expect(expr,value) (expr) 216 #define ecb_expect(expr,value) (expr)
43# define ecb_prefetch(addr,rw,locality) 217 #define ecb_prefetch(addr,rw,locality)
44#endif 218#endif
45 219
220/* no emulation for ecb_decltype */
46#if ECB_GCC_VERSION(4,5) 221#if ECB_GCC_VERSION(4,5)
47# define ecb_decltype(x) __decltype(x) 222 #define ecb_decltype(x) __decltype(x)
48#elif ECB_GCC_VERSION(3,0) 223#elif ECB_GCC_VERSION(3,0)
49# define ecb_decltype(x) typeof(x) 224 #define ecb_decltype(x) __typeof(x)
50#endif 225#endif
51 226
52#define ecb_noinline ecb_attribute ((noinline)) 227#define ecb_noinline ecb_attribute ((__noinline__))
53#define ecb_noreturn ecb_attribute ((noreturn)) 228#define ecb_noreturn ecb_attribute ((__noreturn__))
54#define ecb_unused ecb_attribute ((unused)) 229#define ecb_unused ecb_attribute ((__unused__))
55#define ecb_const ecb_attribute ((const)) 230#define ecb_const ecb_attribute ((__const__))
56#define ecb_pure ecb_attribute ((pure)) 231#define ecb_pure ecb_attribute ((__pure__))
232
233#if ECB_GCC_VERSION(4,3)
234 #define ecb_artificial ecb_attribute ((__artificial__))
57#define ecb_hot ecb_attribute ((hot)) // 4.3 235 #define ecb_hot ecb_attribute ((__hot__))
58#define ecb_cold ecb_attribute ((cold)) // 4.3 236 #define ecb_cold ecb_attribute ((__cold__))
237#else
238 #define ecb_artificial
239 #define ecb_hot
240 #define ecb_cold
241#endif
242
243/* put around conditional expressions if you are very sure that the */
244/* expression is mostly true or mostly false. note that these return */
245/* booleans, not the expression. */
246#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
247#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
248/* for compatibility to the rest of the world */
249#define ecb_likely(expr) ecb_expect_true (expr)
250#define ecb_unlikely(expr) ecb_expect_false (expr)
251
252/* count trailing zero bits and count # of one bits */
253#if ECB_GCC_VERSION(3,4)
254 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
255 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
256 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
257 #define ecb_ctz32(x) __builtin_ctz (x)
258 #define ecb_ctz64(x) __builtin_ctzll (x)
259 #define ecb_popcount32(x) __builtin_popcount (x)
260 /* no popcountll */
261#else
262 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
263 ecb_function_ int
264 ecb_ctz32 (uint32_t x)
265 {
266 int r = 0;
267
268 x &= ~x + 1; /* this isolates the lowest bit */
269
270#if ECB_branchless_on_i386
271 r += !!(x & 0xaaaaaaaa) << 0;
272 r += !!(x & 0xcccccccc) << 1;
273 r += !!(x & 0xf0f0f0f0) << 2;
274 r += !!(x & 0xff00ff00) << 3;
275 r += !!(x & 0xffff0000) << 4;
276#else
277 if (x & 0xaaaaaaaa) r += 1;
278 if (x & 0xcccccccc) r += 2;
279 if (x & 0xf0f0f0f0) r += 4;
280 if (x & 0xff00ff00) r += 8;
281 if (x & 0xffff0000) r += 16;
282#endif
283
284 return r;
285 }
286
287 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
288 ecb_function_ int
289 ecb_ctz64 (uint64_t x)
290 {
291 int shift = x & 0xffffffffU ? 0 : 32;
292 return ecb_ctz32 (x >> shift) + shift;
293 }
294
295 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
296 ecb_function_ int
297 ecb_popcount32 (uint32_t x)
298 {
299 x -= (x >> 1) & 0x55555555;
300 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
301 x = ((x >> 4) + x) & 0x0f0f0f0f;
302 x *= 0x01010101;
303
304 return x >> 24;
305 }
306
307 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
308 ecb_function_ int ecb_ld32 (uint32_t x)
309 {
310 int r = 0;
311
312 if (x >> 16) { x >>= 16; r += 16; }
313 if (x >> 8) { x >>= 8; r += 8; }
314 if (x >> 4) { x >>= 4; r += 4; }
315 if (x >> 2) { x >>= 2; r += 2; }
316 if (x >> 1) { r += 1; }
317
318 return r;
319 }
320
321 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
322 ecb_function_ int ecb_ld64 (uint64_t x)
323 {
324 int r = 0;
325
326 if (x >> 32) { x >>= 32; r += 32; }
327
328 return r + ecb_ld32 (x);
329 }
330#endif
331
332ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
333ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
334{
335 return ( (x * 0x0802U & 0x22110U)
336 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
337}
338
339ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
340ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
341{
342 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
343 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
344 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
345 x = ( x >> 8 ) | ( x << 8);
346
347 return x;
348}
349
350ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
351ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
352{
353 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
354 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
355 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
356 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
357 x = ( x >> 16 ) | ( x << 16);
358
359 return x;
360}
361
362/* popcount64 is only available on 64 bit cpus as gcc builtin */
363/* so for this version we are lazy */
364ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
365ecb_function_ int
366ecb_popcount64 (uint64_t x)
367{
368 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
369}
370
371ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
372ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
373ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
374ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
375ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
376ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
377ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
378ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
379
380ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
381ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
382ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
383ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
384ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
385ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
386ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
387ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
388
389#if ECB_GCC_VERSION(4,3)
390 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
391 #define ecb_bswap32(x) __builtin_bswap32 (x)
392 #define ecb_bswap64(x) __builtin_bswap64 (x)
393#else
394 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
395 ecb_function_ uint16_t
396 ecb_bswap16 (uint16_t x)
397 {
398 return ecb_rotl16 (x, 8);
399 }
400
401 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
402 ecb_function_ uint32_t
403 ecb_bswap32 (uint32_t x)
404 {
405 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
406 }
407
408 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
409 ecb_function_ uint64_t
410 ecb_bswap64 (uint64_t x)
411 {
412 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
413 }
414#endif
59 415
60#if ECB_GCC_VERSION(4,5) 416#if ECB_GCC_VERSION(4,5)
61# define ecb_unreachable() __builtin_unreachable () 417 #define ecb_unreachable() __builtin_unreachable ()
62#else 418#else
63 // this seems to work fine, but gcc always emits a warning for it :/ 419 /* this seems to work fine, but gcc always emits a warning for it :/ */
64 static inline void ecb_unreachable () ecb_attribute ((noreturn)); 420 ecb_inline void ecb_unreachable (void) ecb_noreturn;
65 static inline void ecb_unreachable () { } 421 ecb_inline void ecb_unreachable (void) { }
66#endif 422#endif
67 423
68// put into ifs if you are very sure that the expression
69// is mostly true or mosty false. note that these return
70// booleans, not the expression.
71#define ecb_expect_false(expr) ecb_expect ((expr) ? 1 : 0, 0)
72#define ecb_expect_true(expr) ecb_expect ((expr) ? 1 : 0, 1)
73
74// try to tell the compiler that some condition is definitely true 424/* try to tell the compiler that some condition is definitely true */
75#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 425#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
76 426
77// count trailing zero bits and count # of one bits 427ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
78#if ECB_GCC_VERSION(3,4) 428ecb_inline unsigned char
79static inline int ecb_ctz (unsigned int x) { return __builtin_ctz (x); } 429ecb_byteorder_helper (void)
80static inline int ecb_popcount (unsigned int x) { return __builtin_popcount (x); }
81#else
82static int ecb_ctz (unsigned int x) ecb_const
83{ 430{
84 int r = 0; 431 const uint32_t u = 0x11223344;
85 432 return *(unsigned char *)&u;
86 x &= -x; // this isolates the lowest bit
87
88 if (x & 0xaaaaaaaa) r += 1;
89 if (x & 0xcccccccc) r += 2;
90 if (x & 0xf0f0f0f0) r += 4;
91 if (x & 0xff00ff00) r += 8;
92 if (x & 0xffff0000) r += 16;
93
94 return r;
95} 433}
96 434
97static int ecb_popcount (unsigned int x) ecb_const 435ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
98{ 436ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
99 x -= (x >> 1) & 0x55555555; 437ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
100 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 438ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
101 x = ((x >> 4) + x) & 0x0f0f0f0f;
102 x *= 0x01010101;
103 439
104 return x >> 24; 440#if ECB_GCC_VERSION(3,0) || ECB_C99
105} 441 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
442#else
443 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
106#endif 444#endif
107 445
446#if __cplusplus
447 template<typename T>
448 static inline T ecb_div_rd (T val, T div)
449 {
450 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
451 }
452 template<typename T>
453 static inline T ecb_div_ru (T val, T div)
454 {
455 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
456 }
457#else
458 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
459 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
108#endif 460#endif
109 461
462#if ecb_cplusplus_does_not_suck
463 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
464 template<typename T, int N>
465 static inline int ecb_array_length (const T (&arr)[N])
466 {
467 return N;
468 }
469#else
470 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
471#endif
472
473#endif
474

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