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Revision: 1.93
Committed: Tue May 29 19:10:50 2012 UTC (12 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.92: +15 -10 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 1.87 /* 16 bits major, 16 bits minor */
34     #define ECB_VERSION 0x00010001
35    
36 root 1.44 #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 root 1.51 #else /* _MSC_VER || __BORLANDC__ */
47 root 1.44 typedef signed __int64 int64_t;
48     typedef unsigned __int64 uint64_t;
49     #endif
50 root 1.87 #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 root 1.89 typedef intptr_t ptrdiff_t;
60 root 1.44 #else
61     #include <inttypes.h>
62 root 1.87 #if UINTMAX_MAX > 0xffffffffU
63     #define ECB_PTRSIZE 8
64     #else
65     #define ECB_PTRSIZE 4
66     #endif
67 root 1.44 #endif
68 root 1.6
69 root 1.12 /* many compilers define _GNUC_ to some versions but then only implement
70     * what their idiot authors think are the "more important" extensions,
71 sf-exg 1.59 * causing enormous grief in return for some better fake benchmark numbers.
72 root 1.18 * or so.
73 root 1.12 * we try to detect these and simply assume they are not gcc - if they have
74     * an issue with that they should have done it right in the first place.
75     */
76 root 1.14 #ifndef ECB_GCC_VERSION
77 root 1.85 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
78 root 1.37 #define ECB_GCC_VERSION(major,minor) 0
79     #else
80     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81     #endif
82 root 1.12 #endif
83 root 1.1
84 root 1.91 #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
85     #define ECB_C99 (__STDC_VERSION__ >= 199901L)
86     #define ECB_C11 (__STDC_VERSION__ >= 201112L)
87     #define ECB_CPP (__cplusplus+0)
88     #define ECB_CPP98 (__cplusplus >= 199711L)
89     #define ECB_CPP11 (__cplusplus >= 201103L)
90 root 1.90
91 root 1.52 /*****************************************************************************/
92    
93 root 1.58 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
94     /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
95    
96 root 1.79 #if ECB_NO_THREADS
97     # define ECB_NO_SMP 1
98     #endif
99    
100 root 1.93 #if ECB_NO_SMP
101 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
102 root 1.58 #endif
103    
104 root 1.52 #ifndef ECB_MEMORY_FENCE
105 root 1.90 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
106     /* we assume that these memory fences work on all variables/all memory accesses, */
107     /* not just C11 atomics and atomic accesses */
108     #include <stdatomic.h>
109 root 1.93 #if 0
110 root 1.90 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
111     #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
112     #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
113 root 1.93 #else
114     /* the above *should* be enough in my book, but after experiences with gcc-4.7 */
115     /* and clang, better play safe */
116     #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
117     #endif
118 root 1.92 #endif
119     #endif
120    
121 root 1.90 #ifndef ECB_MEMORY_FENCE
122 root 1.85 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
123 root 1.73 #if __i386 || __i386__
124 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
125 root 1.57 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
126     #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
127 root 1.73 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
128 root 1.52 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
129     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
130 root 1.57 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
131 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
132     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
133 root 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
134     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
135 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
136 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
137     || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
138 root 1.65 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
139 root 1.73 #elif __sparc || __sparc__
140 root 1.74 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
141 root 1.77 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
142 root 1.74 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
143 root 1.85 #elif defined __s390__ || defined __s390x__
144 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
145 root 1.85 #elif defined __mips__
146 root 1.80 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
147 root 1.86 #elif defined __alpha__
148     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
149 root 1.52 #endif
150     #endif
151     #endif
152    
153     #ifndef ECB_MEMORY_FENCE
154 root 1.93 #if ECB_GCC_VERSION(4,7)
155     /* unsolved mystery: ACQ_REL should be enough, but doesn't generate any code */
156     /* which in turn actually breaks libev */
157     #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
158     #elif defined __clang && __has_feature (cxx_atomic)
159     /* see above */
160     #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
161     #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
162 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
163 root 1.62 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
164     /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
165 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
166     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
167     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
168     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
169     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
170 root 1.85 #elif defined _WIN32
171 root 1.55 #include <WinNT.h>
172 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
173 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
174     #include <mbarrier.h>
175     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
176     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
177     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
178 root 1.82 #elif __xlC__
179 root 1.83 #define ECB_MEMORY_FENCE __sync ()
180 root 1.52 #endif
181     #endif
182    
183 root 1.53 #ifndef ECB_MEMORY_FENCE
184 root 1.62 #if !ECB_AVOID_PTHREADS
185     /*
186     * if you get undefined symbol references to pthread_mutex_lock,
187     * or failure to find pthread.h, then you should implement
188     * the ECB_MEMORY_FENCE operations for your cpu/compiler
189     * OR provide pthread.h and link against the posix thread library
190     * of your system.
191     */
192     #include <pthread.h>
193     #define ECB_NEEDS_PTHREADS 1
194     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
195 root 1.52
196 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
197     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
198     #endif
199     #endif
200    
201 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
202 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
203 root 1.62 #endif
204    
205 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
206 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
207     #endif
208    
209     /*****************************************************************************/
210    
211 root 1.39 #if __cplusplus
212 root 1.46 #define ecb_inline static inline
213 root 1.38 #elif ECB_GCC_VERSION(2,5)
214 root 1.46 #define ecb_inline static __inline__
215 root 1.39 #elif ECB_C99
216 root 1.46 #define ecb_inline static inline
217 root 1.29 #else
218 root 1.46 #define ecb_inline static
219 root 1.38 #endif
220    
221     #if ECB_GCC_VERSION(3,3)
222     #define ecb_restrict __restrict__
223 root 1.39 #elif ECB_C99
224 root 1.38 #define ecb_restrict restrict
225     #else
226     #define ecb_restrict
227 root 1.4 #endif
228    
229 root 1.38 typedef int ecb_bool;
230    
231 root 1.8 #define ECB_CONCAT_(a, b) a ## b
232     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
233     #define ECB_STRINGIFY_(a) # a
234     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
235    
236 root 1.46 #define ecb_function_ ecb_inline
237 root 1.3
238 root 1.1 #if ECB_GCC_VERSION(3,1)
239 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
240     #define ecb_is_constant(expr) __builtin_constant_p (expr)
241     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
242     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
243     #else
244     #define ecb_attribute(attrlist)
245     #define ecb_is_constant(expr) 0
246     #define ecb_expect(expr,value) (expr)
247     #define ecb_prefetch(addr,rw,locality)
248 root 1.1 #endif
249    
250 root 1.2 /* no emulation for ecb_decltype */
251 root 1.1 #if ECB_GCC_VERSION(4,5)
252 root 1.37 #define ecb_decltype(x) __decltype(x)
253 root 1.1 #elif ECB_GCC_VERSION(3,0)
254 root 1.39 #define ecb_decltype(x) __typeof(x)
255 root 1.1 #endif
256    
257 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
258     #define ecb_unused ecb_attribute ((__unused__))
259     #define ecb_const ecb_attribute ((__const__))
260     #define ecb_pure ecb_attribute ((__pure__))
261 root 1.35
262 root 1.90 #if ECB_C11
263     #define ecb_noreturn _Noreturn
264     #else
265     #define ecb_noreturn ecb_attribute ((__noreturn__))
266     #endif
267    
268 root 1.35 #if ECB_GCC_VERSION(4,3)
269 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
270     #define ecb_hot ecb_attribute ((__hot__))
271     #define ecb_cold ecb_attribute ((__cold__))
272 root 1.35 #else
273     #define ecb_artificial
274     #define ecb_hot
275     #define ecb_cold
276     #endif
277 root 1.1
278 root 1.39 /* put around conditional expressions if you are very sure that the */
279     /* expression is mostly true or mostly false. note that these return */
280     /* booleans, not the expression. */
281 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
282     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
283 root 1.36 /* for compatibility to the rest of the world */
284 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
285     #define ecb_unlikely(expr) ecb_expect_false (expr)
286 root 1.1
287 root 1.3 /* count trailing zero bits and count # of one bits */
288 root 1.1 #if ECB_GCC_VERSION(3,4)
289 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
290     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
291     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
292 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
293 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
294 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
295 root 1.49 /* no popcountll */
296 root 1.1 #else
297 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
298     ecb_function_ int
299 root 1.35 ecb_ctz32 (uint32_t x)
300     {
301     int r = 0;
302    
303 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
304 root 1.35
305 root 1.50 #if ECB_branchless_on_i386
306     r += !!(x & 0xaaaaaaaa) << 0;
307     r += !!(x & 0xcccccccc) << 1;
308     r += !!(x & 0xf0f0f0f0) << 2;
309     r += !!(x & 0xff00ff00) << 3;
310     r += !!(x & 0xffff0000) << 4;
311     #else
312 root 1.35 if (x & 0xaaaaaaaa) r += 1;
313     if (x & 0xcccccccc) r += 2;
314     if (x & 0xf0f0f0f0) r += 4;
315     if (x & 0xff00ff00) r += 8;
316     if (x & 0xffff0000) r += 16;
317 root 1.50 #endif
318 root 1.35
319     return r;
320     }
321    
322 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
323     ecb_function_ int
324     ecb_ctz64 (uint64_t x)
325     {
326     int shift = x & 0xffffffffU ? 0 : 32;
327 root 1.50 return ecb_ctz32 (x >> shift) + shift;
328 root 1.49 }
329    
330 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
331     ecb_function_ int
332 root 1.35 ecb_popcount32 (uint32_t x)
333     {
334     x -= (x >> 1) & 0x55555555;
335     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
336     x = ((x >> 4) + x) & 0x0f0f0f0f;
337     x *= 0x01010101;
338 root 1.1
339 root 1.35 return x >> 24;
340     }
341 root 1.49
342     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
343     ecb_function_ int ecb_ld32 (uint32_t x)
344     {
345 root 1.50 int r = 0;
346 root 1.49
347 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
348     if (x >> 8) { x >>= 8; r += 8; }
349     if (x >> 4) { x >>= 4; r += 4; }
350     if (x >> 2) { x >>= 2; r += 2; }
351     if (x >> 1) { r += 1; }
352 root 1.49
353     return r;
354     }
355    
356     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
357     ecb_function_ int ecb_ld64 (uint64_t x)
358     {
359 root 1.50 int r = 0;
360 root 1.49
361 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
362 root 1.49
363 root 1.50 return r + ecb_ld32 (x);
364 root 1.49 }
365 root 1.1 #endif
366    
367 root 1.88 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
368     ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
369     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
370     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
371    
372 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
373 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
374     {
375     return ( (x * 0x0802U & 0x22110U)
376     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
377     }
378    
379 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
380 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
381     {
382     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
383     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
384     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
385     x = ( x >> 8 ) | ( x << 8);
386    
387     return x;
388     }
389    
390 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
391 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
392     {
393     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
394     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
395     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
396     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
397     x = ( x >> 16 ) | ( x << 16);
398    
399     return x;
400     }
401    
402 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
403     /* so for this version we are lazy */
404     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
405     ecb_function_ int
406     ecb_popcount64 (uint64_t x)
407     {
408     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
409     }
410    
411 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
412     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
413     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
414     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
415     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
416     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
417     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
418     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
419    
420     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
421     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
422     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
423     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
424     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
425     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
426     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
427     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
428    
429 root 1.13 #if ECB_GCC_VERSION(4,3)
430 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
431     #define ecb_bswap32(x) __builtin_bswap32 (x)
432     #define ecb_bswap64(x) __builtin_bswap64 (x)
433 root 1.13 #else
434 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
435     ecb_function_ uint16_t
436     ecb_bswap16 (uint16_t x)
437 root 1.49 {
438 root 1.50 return ecb_rotl16 (x, 8);
439 root 1.49 }
440    
441 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
442     ecb_function_ uint32_t
443 root 1.35 ecb_bswap32 (uint32_t x)
444     {
445 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
446 root 1.35 }
447    
448 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
449     ecb_function_ uint64_t
450     ecb_bswap64 (uint64_t x)
451 root 1.35 {
452 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
453 root 1.35 }
454 root 1.13 #endif
455    
456     #if ECB_GCC_VERSION(4,5)
457 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
458 root 1.13 #else
459 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
460 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
461     ecb_inline void ecb_unreachable (void) { }
462 root 1.13 #endif
463    
464 root 1.41 /* try to tell the compiler that some condition is definitely true */
465     #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
466    
467 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
468     ecb_inline unsigned char
469 root 1.23 ecb_byteorder_helper (void)
470 root 1.3 {
471     const uint32_t u = 0x11223344;
472     return *(unsigned char *)&u;
473     }
474    
475 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
476     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
477     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
478     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
479 root 1.3
480 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
481 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
482 root 1.31 #else
483 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
484 root 1.31 #endif
485 root 1.21
486 sf-exg 1.68 #if __cplusplus
487     template<typename T>
488     static inline T ecb_div_rd (T val, T div)
489     {
490     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
491     }
492     template<typename T>
493     static inline T ecb_div_ru (T val, T div)
494     {
495     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
496     }
497     #else
498     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
499     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
500     #endif
501 sf-exg 1.67
502 root 1.5 #if ecb_cplusplus_does_not_suck
503 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
504 root 1.35 template<typename T, int N>
505     static inline int ecb_array_length (const T (&arr)[N])
506     {
507     return N;
508     }
509 root 1.5 #else
510 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
511 root 1.5 #endif
512    
513 root 1.1 #endif
514