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Revision: 1.86
Committed: Thu Apr 12 04:09:25 2012 UTC (12 years, 2 months ago) by root
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Branch: MAIN
Changes since 1.85: +2 -0 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 1.85 #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 1.85 #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 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
92     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
93 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
94 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
95     || 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 1.85 #elif defined __s390__ || defined __s390x__
102 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
103 root 1.85 #elif defined __mips__
104 root 1.80 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
105 root 1.86 #elif defined __alpha__
106     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
107 root 1.52 #endif
108     #endif
109     #endif
110    
111     #ifndef ECB_MEMORY_FENCE
112 root 1.85 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
113 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
114 root 1.62 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
115     /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
116 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
117     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
118     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
119     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
120     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
121 root 1.85 #elif defined _WIN32
122 root 1.55 #include <WinNT.h>
123 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
124 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
125     #include <mbarrier.h>
126     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
127     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
128     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
129 root 1.82 #elif __xlC__
130 root 1.83 #define ECB_MEMORY_FENCE __sync ()
131 root 1.52 #endif
132     #endif
133    
134 root 1.53 #ifndef ECB_MEMORY_FENCE
135 root 1.62 #if !ECB_AVOID_PTHREADS
136     /*
137     * if you get undefined symbol references to pthread_mutex_lock,
138     * or failure to find pthread.h, then you should implement
139     * the ECB_MEMORY_FENCE operations for your cpu/compiler
140     * OR provide pthread.h and link against the posix thread library
141     * of your system.
142     */
143     #include <pthread.h>
144     #define ECB_NEEDS_PTHREADS 1
145     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
146 root 1.52
147 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
148     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
149     #endif
150     #endif
151    
152 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
153 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
154 root 1.62 #endif
155    
156 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
157 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
158     #endif
159    
160     /*****************************************************************************/
161    
162 root 1.39 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
163    
164     #if __cplusplus
165 root 1.46 #define ecb_inline static inline
166 root 1.38 #elif ECB_GCC_VERSION(2,5)
167 root 1.46 #define ecb_inline static __inline__
168 root 1.39 #elif ECB_C99
169 root 1.46 #define ecb_inline static inline
170 root 1.29 #else
171 root 1.46 #define ecb_inline static
172 root 1.38 #endif
173    
174     #if ECB_GCC_VERSION(3,3)
175     #define ecb_restrict __restrict__
176 root 1.39 #elif ECB_C99
177 root 1.38 #define ecb_restrict restrict
178     #else
179     #define ecb_restrict
180 root 1.4 #endif
181    
182 root 1.38 typedef int ecb_bool;
183    
184 root 1.8 #define ECB_CONCAT_(a, b) a ## b
185     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
186     #define ECB_STRINGIFY_(a) # a
187     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
188    
189 root 1.46 #define ecb_function_ ecb_inline
190 root 1.3
191 root 1.1 #if ECB_GCC_VERSION(3,1)
192 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
193     #define ecb_is_constant(expr) __builtin_constant_p (expr)
194     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
195     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
196     #else
197     #define ecb_attribute(attrlist)
198     #define ecb_is_constant(expr) 0
199     #define ecb_expect(expr,value) (expr)
200     #define ecb_prefetch(addr,rw,locality)
201 root 1.1 #endif
202    
203 root 1.2 /* no emulation for ecb_decltype */
204 root 1.1 #if ECB_GCC_VERSION(4,5)
205 root 1.37 #define ecb_decltype(x) __decltype(x)
206 root 1.1 #elif ECB_GCC_VERSION(3,0)
207 root 1.39 #define ecb_decltype(x) __typeof(x)
208 root 1.1 #endif
209    
210 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
211     #define ecb_noreturn ecb_attribute ((__noreturn__))
212     #define ecb_unused ecb_attribute ((__unused__))
213     #define ecb_const ecb_attribute ((__const__))
214     #define ecb_pure ecb_attribute ((__pure__))
215 root 1.35
216     #if ECB_GCC_VERSION(4,3)
217 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
218     #define ecb_hot ecb_attribute ((__hot__))
219     #define ecb_cold ecb_attribute ((__cold__))
220 root 1.35 #else
221     #define ecb_artificial
222     #define ecb_hot
223     #define ecb_cold
224     #endif
225 root 1.1
226 root 1.39 /* put around conditional expressions if you are very sure that the */
227     /* expression is mostly true or mostly false. note that these return */
228     /* booleans, not the expression. */
229 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
230     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
231 root 1.36 /* for compatibility to the rest of the world */
232 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
233     #define ecb_unlikely(expr) ecb_expect_false (expr)
234 root 1.1
235 root 1.3 /* count trailing zero bits and count # of one bits */
236 root 1.1 #if ECB_GCC_VERSION(3,4)
237 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
238     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
239     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
240 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
241 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
242 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
243 root 1.49 /* no popcountll */
244 root 1.1 #else
245 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
246     ecb_function_ int
247 root 1.35 ecb_ctz32 (uint32_t x)
248     {
249     int r = 0;
250    
251 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
252 root 1.35
253 root 1.50 #if ECB_branchless_on_i386
254     r += !!(x & 0xaaaaaaaa) << 0;
255     r += !!(x & 0xcccccccc) << 1;
256     r += !!(x & 0xf0f0f0f0) << 2;
257     r += !!(x & 0xff00ff00) << 3;
258     r += !!(x & 0xffff0000) << 4;
259     #else
260 root 1.35 if (x & 0xaaaaaaaa) r += 1;
261     if (x & 0xcccccccc) r += 2;
262     if (x & 0xf0f0f0f0) r += 4;
263     if (x & 0xff00ff00) r += 8;
264     if (x & 0xffff0000) r += 16;
265 root 1.50 #endif
266 root 1.35
267     return r;
268     }
269    
270 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
271     ecb_function_ int
272     ecb_ctz64 (uint64_t x)
273     {
274     int shift = x & 0xffffffffU ? 0 : 32;
275 root 1.50 return ecb_ctz32 (x >> shift) + shift;
276 root 1.49 }
277    
278 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
279     ecb_function_ int
280 root 1.35 ecb_popcount32 (uint32_t x)
281     {
282     x -= (x >> 1) & 0x55555555;
283     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
284     x = ((x >> 4) + x) & 0x0f0f0f0f;
285     x *= 0x01010101;
286 root 1.1
287 root 1.35 return x >> 24;
288     }
289 root 1.49
290     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
291     ecb_function_ int ecb_ld32 (uint32_t x)
292     {
293 root 1.50 int r = 0;
294 root 1.49
295 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
296     if (x >> 8) { x >>= 8; r += 8; }
297     if (x >> 4) { x >>= 4; r += 4; }
298     if (x >> 2) { x >>= 2; r += 2; }
299     if (x >> 1) { r += 1; }
300 root 1.49
301     return r;
302     }
303    
304     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
305     ecb_function_ int ecb_ld64 (uint64_t x)
306     {
307 root 1.50 int r = 0;
308 root 1.49
309 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
310 root 1.49
311 root 1.50 return r + ecb_ld32 (x);
312 root 1.49 }
313 root 1.1 #endif
314    
315 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
316 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
317     {
318     return ( (x * 0x0802U & 0x22110U)
319     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
320     }
321    
322 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
323 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
324     {
325     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
326     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
327     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
328     x = ( x >> 8 ) | ( x << 8);
329    
330     return x;
331     }
332    
333 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
334 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
335     {
336     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
337     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
338     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
339     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
340     x = ( x >> 16 ) | ( x << 16);
341    
342     return x;
343     }
344    
345 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
346     /* so for this version we are lazy */
347     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
348     ecb_function_ int
349     ecb_popcount64 (uint64_t x)
350     {
351     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
352     }
353    
354 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
355     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
356     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
357     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
358     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
359     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
360     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
361     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
362    
363     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
364     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
365     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
366     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
367     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
368     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
369     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
370     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
371    
372 root 1.13 #if ECB_GCC_VERSION(4,3)
373 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
374     #define ecb_bswap32(x) __builtin_bswap32 (x)
375     #define ecb_bswap64(x) __builtin_bswap64 (x)
376 root 1.13 #else
377 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
378     ecb_function_ uint16_t
379     ecb_bswap16 (uint16_t x)
380 root 1.49 {
381 root 1.50 return ecb_rotl16 (x, 8);
382 root 1.49 }
383    
384 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
385     ecb_function_ uint32_t
386 root 1.35 ecb_bswap32 (uint32_t x)
387     {
388 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
389 root 1.35 }
390    
391 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
392     ecb_function_ uint64_t
393     ecb_bswap64 (uint64_t x)
394 root 1.35 {
395 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
396 root 1.35 }
397 root 1.13 #endif
398    
399     #if ECB_GCC_VERSION(4,5)
400 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
401 root 1.13 #else
402 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
403 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
404     ecb_inline void ecb_unreachable (void) { }
405 root 1.13 #endif
406    
407 root 1.41 /* try to tell the compiler that some condition is definitely true */
408     #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
409    
410 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
411     ecb_inline unsigned char
412 root 1.23 ecb_byteorder_helper (void)
413 root 1.3 {
414     const uint32_t u = 0x11223344;
415     return *(unsigned char *)&u;
416     }
417    
418 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
419     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
420     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
421     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
422 root 1.3
423 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
424 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
425 root 1.31 #else
426 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
427 root 1.31 #endif
428 root 1.21
429 sf-exg 1.68 #if __cplusplus
430     template<typename T>
431     static inline T ecb_div_rd (T val, T div)
432     {
433     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
434     }
435     template<typename T>
436     static inline T ecb_div_ru (T val, T div)
437     {
438     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
439     }
440     #else
441     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
442     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
443     #endif
444 sf-exg 1.67
445 root 1.5 #if ecb_cplusplus_does_not_suck
446 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
447 root 1.35 template<typename T, int N>
448     static inline int ecb_array_length (const T (&arr)[N])
449     {
450     return N;
451     }
452 root 1.5 #else
453 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
454 root 1.5 #endif
455    
456 root 1.1 #endif
457