ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libecb/ecb.h
Revision: 1.76
Committed: Wed Jan 25 20:23:12 2012 UTC (12 years, 4 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.75: +6 -6 lines
Log Message:
*** empty log message ***

File Contents

# 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     #if ECB_NO_THREADS || ECB_NO_SMP
72 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
73 root 1.58 #endif
74    
75 root 1.52 #ifndef ECB_MEMORY_FENCE
76 root 1.72 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
77 root 1.73 #if __i386 || __i386__
78 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79 root 1.57 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
80     #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
81 root 1.73 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
82 root 1.52 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
84 root 1.57 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
85 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
86     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87 root 1.62 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
88 root 1.64 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
89 root 1.65 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90 root 1.64 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
91 root 1.62 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
92 root 1.65 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
93 root 1.73 #elif __sparc || __sparc__
94 root 1.74 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
95     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
96     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
97 root 1.52 #endif
98     #endif
99     #endif
100    
101     #ifndef ECB_MEMORY_FENCE
102 root 1.69 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
103 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
104 root 1.62 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
105     /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
106 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
107     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
108     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
109     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
110     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
111 root 1.55 #elif defined(_WIN32)
112     #include <WinNT.h>
113 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
114 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
115     #include <mbarrier.h>
116     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
117     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
118     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
119 root 1.52 #endif
120     #endif
121    
122 root 1.53 #ifndef ECB_MEMORY_FENCE
123 root 1.62 #if !ECB_AVOID_PTHREADS
124     /*
125     * if you get undefined symbol references to pthread_mutex_lock,
126     * or failure to find pthread.h, then you should implement
127     * the ECB_MEMORY_FENCE operations for your cpu/compiler
128     * OR provide pthread.h and link against the posix thread library
129     * of your system.
130     */
131     #include <pthread.h>
132     #define ECB_NEEDS_PTHREADS 1
133     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
134 root 1.52
135 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
136     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
137     #endif
138     #endif
139    
140     #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
141 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
142 root 1.62 #endif
143    
144     #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
145 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
146     #endif
147    
148     /*****************************************************************************/
149    
150 root 1.39 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
151    
152     #if __cplusplus
153 root 1.46 #define ecb_inline static inline
154 root 1.38 #elif ECB_GCC_VERSION(2,5)
155 root 1.46 #define ecb_inline static __inline__
156 root 1.39 #elif ECB_C99
157 root 1.46 #define ecb_inline static inline
158 root 1.29 #else
159 root 1.46 #define ecb_inline static
160 root 1.38 #endif
161    
162     #if ECB_GCC_VERSION(3,3)
163     #define ecb_restrict __restrict__
164 root 1.39 #elif ECB_C99
165 root 1.38 #define ecb_restrict restrict
166     #else
167     #define ecb_restrict
168 root 1.4 #endif
169    
170 root 1.38 typedef int ecb_bool;
171    
172 root 1.8 #define ECB_CONCAT_(a, b) a ## b
173     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
174     #define ECB_STRINGIFY_(a) # a
175     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
176    
177 root 1.46 #define ecb_function_ ecb_inline
178 root 1.3
179 root 1.1 #if ECB_GCC_VERSION(3,1)
180 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
181     #define ecb_is_constant(expr) __builtin_constant_p (expr)
182     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
183     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
184     #else
185     #define ecb_attribute(attrlist)
186     #define ecb_is_constant(expr) 0
187     #define ecb_expect(expr,value) (expr)
188     #define ecb_prefetch(addr,rw,locality)
189 root 1.1 #endif
190    
191 root 1.2 /* no emulation for ecb_decltype */
192 root 1.1 #if ECB_GCC_VERSION(4,5)
193 root 1.37 #define ecb_decltype(x) __decltype(x)
194 root 1.1 #elif ECB_GCC_VERSION(3,0)
195 root 1.39 #define ecb_decltype(x) __typeof(x)
196 root 1.1 #endif
197    
198 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
199     #define ecb_noreturn ecb_attribute ((__noreturn__))
200     #define ecb_unused ecb_attribute ((__unused__))
201     #define ecb_const ecb_attribute ((__const__))
202     #define ecb_pure ecb_attribute ((__pure__))
203 root 1.35
204     #if ECB_GCC_VERSION(4,3)
205 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
206     #define ecb_hot ecb_attribute ((__hot__))
207     #define ecb_cold ecb_attribute ((__cold__))
208 root 1.35 #else
209     #define ecb_artificial
210     #define ecb_hot
211     #define ecb_cold
212     #endif
213 root 1.1
214 root 1.39 /* put around conditional expressions if you are very sure that the */
215     /* expression is mostly true or mostly false. note that these return */
216     /* booleans, not the expression. */
217 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
218     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
219 root 1.36 /* for compatibility to the rest of the world */
220 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
221     #define ecb_unlikely(expr) ecb_expect_false (expr)
222 root 1.1
223 root 1.3 /* count trailing zero bits and count # of one bits */
224 root 1.1 #if ECB_GCC_VERSION(3,4)
225 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
226     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
227     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
228 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
229 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
230 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
231 root 1.49 /* no popcountll */
232 root 1.1 #else
233 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
234     ecb_function_ int
235 root 1.35 ecb_ctz32 (uint32_t x)
236     {
237     int r = 0;
238    
239 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
240 root 1.35
241 root 1.50 #if ECB_branchless_on_i386
242     r += !!(x & 0xaaaaaaaa) << 0;
243     r += !!(x & 0xcccccccc) << 1;
244     r += !!(x & 0xf0f0f0f0) << 2;
245     r += !!(x & 0xff00ff00) << 3;
246     r += !!(x & 0xffff0000) << 4;
247     #else
248 root 1.35 if (x & 0xaaaaaaaa) r += 1;
249     if (x & 0xcccccccc) r += 2;
250     if (x & 0xf0f0f0f0) r += 4;
251     if (x & 0xff00ff00) r += 8;
252     if (x & 0xffff0000) r += 16;
253 root 1.50 #endif
254 root 1.35
255     return r;
256     }
257    
258 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
259     ecb_function_ int
260     ecb_ctz64 (uint64_t x)
261     {
262     int shift = x & 0xffffffffU ? 0 : 32;
263 root 1.50 return ecb_ctz32 (x >> shift) + shift;
264 root 1.49 }
265    
266 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
267     ecb_function_ int
268 root 1.35 ecb_popcount32 (uint32_t x)
269     {
270     x -= (x >> 1) & 0x55555555;
271     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
272     x = ((x >> 4) + x) & 0x0f0f0f0f;
273     x *= 0x01010101;
274 root 1.1
275 root 1.35 return x >> 24;
276     }
277 root 1.49
278     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
279     ecb_function_ int ecb_ld32 (uint32_t x)
280     {
281 root 1.50 int r = 0;
282 root 1.49
283 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
284     if (x >> 8) { x >>= 8; r += 8; }
285     if (x >> 4) { x >>= 4; r += 4; }
286     if (x >> 2) { x >>= 2; r += 2; }
287     if (x >> 1) { r += 1; }
288 root 1.49
289     return r;
290     }
291    
292     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
293     ecb_function_ int ecb_ld64 (uint64_t x)
294     {
295 root 1.50 int r = 0;
296 root 1.49
297 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
298 root 1.49
299 root 1.50 return r + ecb_ld32 (x);
300 root 1.49 }
301 root 1.1 #endif
302    
303 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
304 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
305     {
306     return ( (x * 0x0802U & 0x22110U)
307     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
308     }
309    
310 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
311 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
312     {
313     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
314     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
315     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
316     x = ( x >> 8 ) | ( x << 8);
317    
318     return x;
319     }
320    
321 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
322 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
323     {
324     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
325     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
326     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
327     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
328     x = ( x >> 16 ) | ( x << 16);
329    
330     return x;
331     }
332    
333 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
334     /* so for this version we are lazy */
335     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
336     ecb_function_ int
337     ecb_popcount64 (uint64_t x)
338     {
339     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
340     }
341    
342 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
343     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
344     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
345     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
346     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
347     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
348     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
349     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
350    
351     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
352     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
353     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
354     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
355     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
356     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
357     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
358     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
359    
360 root 1.13 #if ECB_GCC_VERSION(4,3)
361 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
362     #define ecb_bswap32(x) __builtin_bswap32 (x)
363     #define ecb_bswap64(x) __builtin_bswap64 (x)
364 root 1.13 #else
365 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
366     ecb_function_ uint16_t
367     ecb_bswap16 (uint16_t x)
368 root 1.49 {
369 root 1.50 return ecb_rotl16 (x, 8);
370 root 1.49 }
371    
372 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
373     ecb_function_ uint32_t
374 root 1.35 ecb_bswap32 (uint32_t x)
375     {
376 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
377 root 1.35 }
378    
379 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
380     ecb_function_ uint64_t
381     ecb_bswap64 (uint64_t x)
382 root 1.35 {
383 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
384 root 1.35 }
385 root 1.13 #endif
386    
387     #if ECB_GCC_VERSION(4,5)
388 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
389 root 1.13 #else
390 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
391 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
392     ecb_inline void ecb_unreachable (void) { }
393 root 1.13 #endif
394    
395 root 1.41 /* try to tell the compiler that some condition is definitely true */
396     #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
397    
398 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
399     ecb_inline unsigned char
400 root 1.23 ecb_byteorder_helper (void)
401 root 1.3 {
402     const uint32_t u = 0x11223344;
403     return *(unsigned char *)&u;
404     }
405    
406 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
407     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
408     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
409     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
410 root 1.3
411 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
412 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
413 root 1.31 #else
414 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
415 root 1.31 #endif
416 root 1.21
417 sf-exg 1.68 #if __cplusplus
418     template<typename T>
419     static inline T ecb_div_rd (T val, T div)
420     {
421     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
422     }
423     template<typename T>
424     static inline T ecb_div_ru (T val, T div)
425     {
426     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
427     }
428     #else
429     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
430     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
431     #endif
432 sf-exg 1.67
433 root 1.5 #if ecb_cplusplus_does_not_suck
434 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
435 root 1.35 template<typename T, int N>
436     static inline int ecb_array_length (const T (&arr)[N])
437     {
438     return N;
439     }
440 root 1.5 #else
441 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
442 root 1.5 #endif
443    
444 root 1.1 #endif
445