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Revision: 1.83
Committed: Sat Mar 24 19:38:33 2012 UTC (12 years, 3 months ago) by root
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Branch: MAIN
Changes since 1.82: +1 -1 lines
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# User Rev Content
1 root 1.1 /*
2 root 1.17 * libecb - http://software.schmorp.de/pkg/libecb
3 root 1.1 *
4 root 1.72 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
5 root 1.7 * Copyright (©) 2011 Emanuele Giaquinta
6 root 1.1 * All rights reserved.
7     *
8     * Redistribution and use in source and binary forms, with or without modifica-
9     * tion, are permitted provided that the following conditions are met:
10     *
11     * 1. Redistributions of source code must retain the above copyright notice,
12     * this list of conditions and the following disclaimer.
13     *
14     * 2. Redistributions in binary form must reproduce the above copyright
15     * notice, this list of conditions and the following disclaimer in the
16     * documentation and/or other materials provided with the distribution.
17     *
18     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20     * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21     * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22     * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26     * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27     * OF THE POSSIBILITY OF SUCH DAMAGE.
28     */
29    
30     #ifndef ECB_H
31     #define ECB_H
32    
33 root 1.44 #ifdef _WIN32
34     typedef signed char int8_t;
35     typedef unsigned char uint8_t;
36     typedef signed short int16_t;
37     typedef unsigned short uint16_t;
38     typedef signed int int32_t;
39     typedef unsigned int uint32_t;
40     #if __GNUC__
41     typedef signed long long int64_t;
42     typedef unsigned long long uint64_t;
43 root 1.51 #else /* _MSC_VER || __BORLANDC__ */
44 root 1.44 typedef signed __int64 int64_t;
45     typedef unsigned __int64 uint64_t;
46     #endif
47     #else
48     #include <inttypes.h>
49     #endif
50 root 1.6
51 root 1.12 /* many compilers define _GNUC_ to some versions but then only implement
52     * what their idiot authors think are the "more important" extensions,
53 sf-exg 1.59 * causing enormous grief in return for some better fake benchmark numbers.
54 root 1.18 * or so.
55 root 1.12 * 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.
57     */
58 root 1.14 #ifndef ECB_GCC_VERSION
59 root 1.47 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
60 root 1.37 #define ECB_GCC_VERSION(major,minor) 0
61     #else
62     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63     #endif
64 root 1.12 #endif
65 root 1.1
66 root 1.52 /*****************************************************************************/
67    
68 root 1.58 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69     /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70    
71 root 1.79 #if ECB_NO_THREADS
72     # define ECB_NO_SMP 1
73     #endif
74    
75 root 1.58 #if ECB_NO_THREADS || ECB_NO_SMP
76 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
77 root 1.58 #endif
78    
79 root 1.52 #ifndef ECB_MEMORY_FENCE
80 root 1.78 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
81 root 1.73 #if __i386 || __i386__
82 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
83 root 1.57 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
84     #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
85 root 1.73 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
86 root 1.52 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
87     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
88 root 1.57 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
89 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
90     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
91 root 1.62 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
92 root 1.64 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
93 root 1.65 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
94 root 1.64 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
95 root 1.62 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
96 root 1.65 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
97 root 1.73 #elif __sparc || __sparc__
98 root 1.74 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
99 root 1.77 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
100 root 1.74 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
101 root 1.77 #elif defined(__s390__) || defined(__s390x__)
102     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
103 root 1.80 #elif defined(__mips__)
104     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
105 root 1.52 #endif
106     #endif
107     #endif
108    
109     #ifndef ECB_MEMORY_FENCE
110 root 1.69 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
111 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
112 root 1.62 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
113     /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
114 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
115     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
116     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
117     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
118     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
119 root 1.55 #elif defined(_WIN32)
120     #include <WinNT.h>
121 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
122 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
123     #include <mbarrier.h>
124     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
125     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
126     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
127 root 1.82 #elif __xlC__
128 root 1.83 #define ECB_MEMORY_FENCE __sync ()
129 root 1.52 #endif
130     #endif
131    
132 root 1.53 #ifndef ECB_MEMORY_FENCE
133 root 1.62 #if !ECB_AVOID_PTHREADS
134     /*
135     * if you get undefined symbol references to pthread_mutex_lock,
136     * or failure to find pthread.h, then you should implement
137     * the ECB_MEMORY_FENCE operations for your cpu/compiler
138     * OR provide pthread.h and link against the posix thread library
139     * of your system.
140     */
141     #include <pthread.h>
142     #define ECB_NEEDS_PTHREADS 1
143     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
144 root 1.52
145 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
146     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
147     #endif
148     #endif
149    
150     #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
151 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
152 root 1.62 #endif
153    
154     #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
155 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
156     #endif
157    
158     /*****************************************************************************/
159    
160 root 1.39 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
161    
162     #if __cplusplus
163 root 1.46 #define ecb_inline static inline
164 root 1.38 #elif ECB_GCC_VERSION(2,5)
165 root 1.46 #define ecb_inline static __inline__
166 root 1.39 #elif ECB_C99
167 root 1.46 #define ecb_inline static inline
168 root 1.29 #else
169 root 1.46 #define ecb_inline static
170 root 1.38 #endif
171    
172     #if ECB_GCC_VERSION(3,3)
173     #define ecb_restrict __restrict__
174 root 1.39 #elif ECB_C99
175 root 1.38 #define ecb_restrict restrict
176     #else
177     #define ecb_restrict
178 root 1.4 #endif
179    
180 root 1.38 typedef int ecb_bool;
181    
182 root 1.8 #define ECB_CONCAT_(a, b) a ## b
183     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
184     #define ECB_STRINGIFY_(a) # a
185     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
186    
187 root 1.46 #define ecb_function_ ecb_inline
188 root 1.3
189 root 1.1 #if ECB_GCC_VERSION(3,1)
190 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
191     #define ecb_is_constant(expr) __builtin_constant_p (expr)
192     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
193     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
194     #else
195     #define ecb_attribute(attrlist)
196     #define ecb_is_constant(expr) 0
197     #define ecb_expect(expr,value) (expr)
198     #define ecb_prefetch(addr,rw,locality)
199 root 1.1 #endif
200    
201 root 1.2 /* no emulation for ecb_decltype */
202 root 1.1 #if ECB_GCC_VERSION(4,5)
203 root 1.37 #define ecb_decltype(x) __decltype(x)
204 root 1.1 #elif ECB_GCC_VERSION(3,0)
205 root 1.39 #define ecb_decltype(x) __typeof(x)
206 root 1.1 #endif
207    
208 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
209     #define ecb_noreturn ecb_attribute ((__noreturn__))
210     #define ecb_unused ecb_attribute ((__unused__))
211     #define ecb_const ecb_attribute ((__const__))
212     #define ecb_pure ecb_attribute ((__pure__))
213 root 1.35
214     #if ECB_GCC_VERSION(4,3)
215 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
216     #define ecb_hot ecb_attribute ((__hot__))
217     #define ecb_cold ecb_attribute ((__cold__))
218 root 1.35 #else
219     #define ecb_artificial
220     #define ecb_hot
221     #define ecb_cold
222     #endif
223 root 1.1
224 root 1.39 /* put around conditional expressions if you are very sure that the */
225     /* expression is mostly true or mostly false. note that these return */
226     /* booleans, not the expression. */
227 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
228     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
229 root 1.36 /* for compatibility to the rest of the world */
230 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
231     #define ecb_unlikely(expr) ecb_expect_false (expr)
232 root 1.1
233 root 1.3 /* count trailing zero bits and count # of one bits */
234 root 1.1 #if ECB_GCC_VERSION(3,4)
235 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
236     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
237     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
238 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
239 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
240 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
241 root 1.49 /* no popcountll */
242 root 1.1 #else
243 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
244     ecb_function_ int
245 root 1.35 ecb_ctz32 (uint32_t x)
246     {
247     int r = 0;
248    
249 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
250 root 1.35
251 root 1.50 #if ECB_branchless_on_i386
252     r += !!(x & 0xaaaaaaaa) << 0;
253     r += !!(x & 0xcccccccc) << 1;
254     r += !!(x & 0xf0f0f0f0) << 2;
255     r += !!(x & 0xff00ff00) << 3;
256     r += !!(x & 0xffff0000) << 4;
257     #else
258 root 1.35 if (x & 0xaaaaaaaa) r += 1;
259     if (x & 0xcccccccc) r += 2;
260     if (x & 0xf0f0f0f0) r += 4;
261     if (x & 0xff00ff00) r += 8;
262     if (x & 0xffff0000) r += 16;
263 root 1.50 #endif
264 root 1.35
265     return r;
266     }
267    
268 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
269     ecb_function_ int
270     ecb_ctz64 (uint64_t x)
271     {
272     int shift = x & 0xffffffffU ? 0 : 32;
273 root 1.50 return ecb_ctz32 (x >> shift) + shift;
274 root 1.49 }
275    
276 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
277     ecb_function_ int
278 root 1.35 ecb_popcount32 (uint32_t x)
279     {
280     x -= (x >> 1) & 0x55555555;
281     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
282     x = ((x >> 4) + x) & 0x0f0f0f0f;
283     x *= 0x01010101;
284 root 1.1
285 root 1.35 return x >> 24;
286     }
287 root 1.49
288     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
289     ecb_function_ int ecb_ld32 (uint32_t x)
290     {
291 root 1.50 int r = 0;
292 root 1.49
293 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
294     if (x >> 8) { x >>= 8; r += 8; }
295     if (x >> 4) { x >>= 4; r += 4; }
296     if (x >> 2) { x >>= 2; r += 2; }
297     if (x >> 1) { r += 1; }
298 root 1.49
299     return r;
300     }
301    
302     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
303     ecb_function_ int ecb_ld64 (uint64_t x)
304     {
305 root 1.50 int r = 0;
306 root 1.49
307 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
308 root 1.49
309 root 1.50 return r + ecb_ld32 (x);
310 root 1.49 }
311 root 1.1 #endif
312    
313 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
314 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
315     {
316     return ( (x * 0x0802U & 0x22110U)
317     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
318     }
319    
320 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
321 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
322     {
323     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
324     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
325     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
326     x = ( x >> 8 ) | ( x << 8);
327    
328     return x;
329     }
330    
331 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
332 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
333     {
334     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
335     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
336     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
337     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
338     x = ( x >> 16 ) | ( x << 16);
339    
340     return x;
341     }
342    
343 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
344     /* so for this version we are lazy */
345     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
346     ecb_function_ int
347     ecb_popcount64 (uint64_t x)
348     {
349     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
350     }
351    
352 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
353     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
354     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
355     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
356     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
357     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
358     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
359     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
360    
361     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
362     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
363     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
364     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
365     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
366     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
367     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
368     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
369    
370 root 1.13 #if ECB_GCC_VERSION(4,3)
371 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
372     #define ecb_bswap32(x) __builtin_bswap32 (x)
373     #define ecb_bswap64(x) __builtin_bswap64 (x)
374 root 1.13 #else
375 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
376     ecb_function_ uint16_t
377     ecb_bswap16 (uint16_t x)
378 root 1.49 {
379 root 1.50 return ecb_rotl16 (x, 8);
380 root 1.49 }
381    
382 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
383     ecb_function_ uint32_t
384 root 1.35 ecb_bswap32 (uint32_t x)
385     {
386 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
387 root 1.35 }
388    
389 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
390     ecb_function_ uint64_t
391     ecb_bswap64 (uint64_t x)
392 root 1.35 {
393 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
394 root 1.35 }
395 root 1.13 #endif
396    
397     #if ECB_GCC_VERSION(4,5)
398 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
399 root 1.13 #else
400 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
401 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
402     ecb_inline void ecb_unreachable (void) { }
403 root 1.13 #endif
404    
405 root 1.41 /* try to tell the compiler that some condition is definitely true */
406     #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
407    
408 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
409     ecb_inline unsigned char
410 root 1.23 ecb_byteorder_helper (void)
411 root 1.3 {
412     const uint32_t u = 0x11223344;
413     return *(unsigned char *)&u;
414     }
415    
416 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
417     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
418     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
419     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
420 root 1.3
421 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
422 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
423 root 1.31 #else
424 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
425 root 1.31 #endif
426 root 1.21
427 sf-exg 1.68 #if __cplusplus
428     template<typename T>
429     static inline T ecb_div_rd (T val, T div)
430     {
431     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
432     }
433     template<typename T>
434     static inline T ecb_div_ru (T val, T div)
435     {
436     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
437     }
438     #else
439     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
440     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
441     #endif
442 sf-exg 1.67
443 root 1.5 #if ecb_cplusplus_does_not_suck
444 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
445 root 1.35 template<typename T, int N>
446     static inline int ecb_array_length (const T (&arr)[N])
447     {
448     return N;
449     }
450 root 1.5 #else
451 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
452 root 1.5 #endif
453    
454 root 1.1 #endif
455