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Revision: 1.101
Committed: Thu Jun 28 14:50:01 2012 UTC (12 years, 1 month ago) by root
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Branch: MAIN
Changes since 1.100: +0 -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 1.87 /* 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 1.44 #else
60     #include <inttypes.h>
61 root 1.87 #if UINTMAX_MAX > 0xffffffffU
62     #define ECB_PTRSIZE 8
63     #else
64     #define ECB_PTRSIZE 4
65     #endif
66 root 1.44 #endif
67 root 1.6
68 root 1.12 /* many compilers define _GNUC_ to some versions but then only implement
69     * what their idiot authors think are the "more important" extensions,
70 sf-exg 1.59 * causing enormous grief in return for some better fake benchmark numbers.
71 root 1.18 * or so.
72 root 1.12 * 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 root 1.14 #ifndef ECB_GCC_VERSION
76 root 1.85 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
77 root 1.37 #define ECB_GCC_VERSION(major,minor) 0
78     #else
79     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
80     #endif
81 root 1.12 #endif
82 root 1.1
83 root 1.91 #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
84     #define ECB_C99 (__STDC_VERSION__ >= 199901L)
85     #define ECB_C11 (__STDC_VERSION__ >= 201112L)
86     #define ECB_CPP (__cplusplus+0)
87     #define ECB_CPP11 (__cplusplus >= 201103L)
88 root 1.90
89 root 1.52 /*****************************************************************************/
90    
91 root 1.58 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
92     /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
93    
94 root 1.79 #if ECB_NO_THREADS
95 root 1.95 #define ECB_NO_SMP 1
96 root 1.79 #endif
97    
98 root 1.93 #if ECB_NO_SMP
99 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
100 root 1.58 #endif
101    
102 root 1.52 #ifndef ECB_MEMORY_FENCE
103 root 1.85 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
104 root 1.73 #if __i386 || __i386__
105 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
106 root 1.94 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
107     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
108 root 1.73 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
109 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
110     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
111     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
112 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
113 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
114 root 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
115     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
116 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
117 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
118 root 1.94 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
119     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
120 root 1.73 #elif __sparc || __sparc__
121 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
122     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
123     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
124 root 1.85 #elif defined __s390__ || defined __s390x__
125 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
126 root 1.85 #elif defined __mips__
127 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
128 root 1.86 #elif defined __alpha__
129 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
130     #elif defined __hppa__
131     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
132     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
133     #elif defined __ia64__
134     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
135 root 1.52 #endif
136     #endif
137     #endif
138    
139     #ifndef ECB_MEMORY_FENCE
140 root 1.93 #if ECB_GCC_VERSION(4,7)
141 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
142 root 1.93 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
143     #elif defined __clang && __has_feature (cxx_atomic)
144 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
145 root 1.93 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
146     #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
147 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
148 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
149     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
150     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
151     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
152     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
153 root 1.85 #elif defined _WIN32
154 root 1.55 #include <WinNT.h>
155 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
156 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
157     #include <mbarrier.h>
158     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
159     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
160     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
161 root 1.82 #elif __xlC__
162 root 1.83 #define ECB_MEMORY_FENCE __sync ()
163 root 1.52 #endif
164     #endif
165    
166 root 1.53 #ifndef ECB_MEMORY_FENCE
167 root 1.94 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
168     /* we assume that these memory fences work on all variables/all memory accesses, */
169     /* not just C11 atomics and atomic accesses */
170     #include <stdatomic.h>
171 root 1.97 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
172     /* any fence other than seq_cst, which isn't very efficient for us. */
173     /* Why that is, we don't know - either the C11 memory model is quite useless */
174     /* for most usages, or gcc and clang have a bug */
175     /* I *currently* lean towards the latter, and inefficiently implement */
176     /* all three of ecb's fences as a seq_cst fence */
177 root 1.94 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
178     #endif
179     #endif
180    
181     #ifndef ECB_MEMORY_FENCE
182 root 1.62 #if !ECB_AVOID_PTHREADS
183     /*
184     * if you get undefined symbol references to pthread_mutex_lock,
185     * or failure to find pthread.h, then you should implement
186     * the ECB_MEMORY_FENCE operations for your cpu/compiler
187     * OR provide pthread.h and link against the posix thread library
188     * of your system.
189     */
190     #include <pthread.h>
191     #define ECB_NEEDS_PTHREADS 1
192     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
193 root 1.52
194 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
195     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
196     #endif
197     #endif
198    
199 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
200 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
201 root 1.62 #endif
202    
203 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
204 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
205     #endif
206    
207     /*****************************************************************************/
208    
209 root 1.39 #if __cplusplus
210 root 1.46 #define ecb_inline static inline
211 root 1.38 #elif ECB_GCC_VERSION(2,5)
212 root 1.46 #define ecb_inline static __inline__
213 root 1.39 #elif ECB_C99
214 root 1.46 #define ecb_inline static inline
215 root 1.29 #else
216 root 1.46 #define ecb_inline static
217 root 1.38 #endif
218    
219     #if ECB_GCC_VERSION(3,3)
220     #define ecb_restrict __restrict__
221 root 1.39 #elif ECB_C99
222 root 1.38 #define ecb_restrict restrict
223     #else
224     #define ecb_restrict
225 root 1.4 #endif
226    
227 root 1.38 typedef int ecb_bool;
228    
229 root 1.8 #define ECB_CONCAT_(a, b) a ## b
230     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
231     #define ECB_STRINGIFY_(a) # a
232     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
233    
234 root 1.46 #define ecb_function_ ecb_inline
235 root 1.3
236 root 1.1 #if ECB_GCC_VERSION(3,1)
237 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
238     #define ecb_is_constant(expr) __builtin_constant_p (expr)
239     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
240     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
241     #else
242     #define ecb_attribute(attrlist)
243     #define ecb_is_constant(expr) 0
244     #define ecb_expect(expr,value) (expr)
245     #define ecb_prefetch(addr,rw,locality)
246 root 1.1 #endif
247    
248 root 1.2 /* no emulation for ecb_decltype */
249 root 1.1 #if ECB_GCC_VERSION(4,5)
250 root 1.37 #define ecb_decltype(x) __decltype(x)
251 root 1.1 #elif ECB_GCC_VERSION(3,0)
252 root 1.39 #define ecb_decltype(x) __typeof(x)
253 root 1.1 #endif
254    
255 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
256     #define ecb_unused ecb_attribute ((__unused__))
257     #define ecb_const ecb_attribute ((__const__))
258     #define ecb_pure ecb_attribute ((__pure__))
259 root 1.35
260 root 1.90 #if ECB_C11
261     #define ecb_noreturn _Noreturn
262     #else
263     #define ecb_noreturn ecb_attribute ((__noreturn__))
264     #endif
265    
266 root 1.35 #if ECB_GCC_VERSION(4,3)
267 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
268     #define ecb_hot ecb_attribute ((__hot__))
269     #define ecb_cold ecb_attribute ((__cold__))
270 root 1.35 #else
271     #define ecb_artificial
272     #define ecb_hot
273     #define ecb_cold
274     #endif
275 root 1.1
276 root 1.39 /* put around conditional expressions if you are very sure that the */
277     /* expression is mostly true or mostly false. note that these return */
278     /* booleans, not the expression. */
279 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
280     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
281 root 1.36 /* for compatibility to the rest of the world */
282 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
283     #define ecb_unlikely(expr) ecb_expect_false (expr)
284 root 1.1
285 root 1.3 /* count trailing zero bits and count # of one bits */
286 root 1.1 #if ECB_GCC_VERSION(3,4)
287 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
288     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
289     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
290 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
291 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
292 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
293 root 1.49 /* no popcountll */
294 root 1.1 #else
295 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
296     ecb_function_ int
297 root 1.35 ecb_ctz32 (uint32_t x)
298     {
299     int r = 0;
300    
301 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
302 root 1.35
303 root 1.50 #if ECB_branchless_on_i386
304     r += !!(x & 0xaaaaaaaa) << 0;
305     r += !!(x & 0xcccccccc) << 1;
306     r += !!(x & 0xf0f0f0f0) << 2;
307     r += !!(x & 0xff00ff00) << 3;
308     r += !!(x & 0xffff0000) << 4;
309     #else
310 root 1.35 if (x & 0xaaaaaaaa) r += 1;
311     if (x & 0xcccccccc) r += 2;
312     if (x & 0xf0f0f0f0) r += 4;
313     if (x & 0xff00ff00) r += 8;
314     if (x & 0xffff0000) r += 16;
315 root 1.50 #endif
316 root 1.35
317     return r;
318     }
319    
320 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
321     ecb_function_ int
322     ecb_ctz64 (uint64_t x)
323     {
324     int shift = x & 0xffffffffU ? 0 : 32;
325 root 1.50 return ecb_ctz32 (x >> shift) + shift;
326 root 1.49 }
327    
328 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
329     ecb_function_ int
330 root 1.35 ecb_popcount32 (uint32_t x)
331     {
332     x -= (x >> 1) & 0x55555555;
333     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
334     x = ((x >> 4) + x) & 0x0f0f0f0f;
335     x *= 0x01010101;
336 root 1.1
337 root 1.35 return x >> 24;
338     }
339 root 1.49
340     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
341     ecb_function_ int ecb_ld32 (uint32_t x)
342     {
343 root 1.50 int r = 0;
344 root 1.49
345 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
346     if (x >> 8) { x >>= 8; r += 8; }
347     if (x >> 4) { x >>= 4; r += 4; }
348     if (x >> 2) { x >>= 2; r += 2; }
349     if (x >> 1) { r += 1; }
350 root 1.49
351     return r;
352     }
353    
354     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
355     ecb_function_ int ecb_ld64 (uint64_t x)
356     {
357 root 1.50 int r = 0;
358 root 1.49
359 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
360 root 1.49
361 root 1.50 return r + ecb_ld32 (x);
362 root 1.49 }
363 root 1.1 #endif
364    
365 root 1.88 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
366     ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
367     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
368     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
369    
370 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
371 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
372     {
373     return ( (x * 0x0802U & 0x22110U)
374     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
375     }
376    
377 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
378 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
379     {
380     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
381     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
382     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
383     x = ( x >> 8 ) | ( x << 8);
384    
385     return x;
386     }
387    
388 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
389 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
390     {
391     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
392     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
393     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
394     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
395     x = ( x >> 16 ) | ( x << 16);
396    
397     return x;
398     }
399    
400 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
401     /* so for this version we are lazy */
402     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
403     ecb_function_ int
404     ecb_popcount64 (uint64_t x)
405     {
406     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
407     }
408    
409 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
410     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
411     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
412     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
413     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
414     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
415     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
416     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
417    
418     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
419     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
420     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
421     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
422     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
423     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
424     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
425     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
426    
427 root 1.13 #if ECB_GCC_VERSION(4,3)
428 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
429     #define ecb_bswap32(x) __builtin_bswap32 (x)
430     #define ecb_bswap64(x) __builtin_bswap64 (x)
431 root 1.13 #else
432 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
433     ecb_function_ uint16_t
434     ecb_bswap16 (uint16_t x)
435 root 1.49 {
436 root 1.50 return ecb_rotl16 (x, 8);
437 root 1.49 }
438    
439 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
440     ecb_function_ uint32_t
441 root 1.35 ecb_bswap32 (uint32_t x)
442     {
443 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
444 root 1.35 }
445    
446 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
447     ecb_function_ uint64_t
448     ecb_bswap64 (uint64_t x)
449 root 1.35 {
450 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
451 root 1.35 }
452 root 1.13 #endif
453    
454     #if ECB_GCC_VERSION(4,5)
455 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
456 root 1.13 #else
457 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
458 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
459     ecb_inline void ecb_unreachable (void) { }
460 root 1.13 #endif
461    
462 root 1.41 /* try to tell the compiler that some condition is definitely true */
463 root 1.100 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
464 root 1.41
465 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
466     ecb_inline unsigned char
467 root 1.23 ecb_byteorder_helper (void)
468 root 1.3 {
469 root 1.98 /* the union code still generates code under pressure in gcc, */
470     /* but less than using pointers, and always seem to */
471     /* successfully return a constant. */
472     /* the reason why we have this horrible preprocessor mess */
473 root 1.99 /* is to avoid it in all cases, at least on common architectures */
474     /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
475 root 1.98 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
476     return 0x44;
477     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
478     return 0x44;
479     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
480     retrurn 0x11;
481     #else
482     union
483     {
484     uint32_t i;
485     uint8_t c;
486     } u = { 0x11223344 };
487     return u.c;
488     #endif
489 root 1.3 }
490    
491 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
492     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
493     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
494     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
495 root 1.3
496 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
497 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
498 root 1.31 #else
499 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
500 root 1.31 #endif
501 root 1.21
502 sf-exg 1.68 #if __cplusplus
503     template<typename T>
504     static inline T ecb_div_rd (T val, T div)
505     {
506     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
507     }
508     template<typename T>
509     static inline T ecb_div_ru (T val, T div)
510     {
511     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
512     }
513     #else
514     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
515     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
516     #endif
517 sf-exg 1.67
518 root 1.5 #if ecb_cplusplus_does_not_suck
519 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
520 root 1.35 template<typename T, int N>
521     static inline int ecb_array_length (const T (&arr)[N])
522     {
523     return N;
524     }
525 root 1.5 #else
526 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
527 root 1.5 #endif
528    
529 root 1.1 #endif
530