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Revision: 1.103
Committed: Thu Jun 28 18:04:44 2012 UTC (11 years, 11 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.102: +106 -62 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 1.102 #if ECB_CPP
90     #define ECB_EXTERN_C extern "C"
91     #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
92     #define ECB_EXTERN_C_END }
93     #else
94     #define ECB_EXTERN_C extern
95     #define ECB_EXTERN_C_BEG
96     #define ECB_EXTERN_C_END
97     #endif
98    
99 root 1.52 /*****************************************************************************/
100    
101 root 1.58 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
102     /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
103    
104 root 1.79 #if ECB_NO_THREADS
105 root 1.95 #define ECB_NO_SMP 1
106 root 1.79 #endif
107    
108 root 1.93 #if ECB_NO_SMP
109 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
110 root 1.58 #endif
111    
112 root 1.52 #ifndef ECB_MEMORY_FENCE
113 root 1.85 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
114 root 1.73 #if __i386 || __i386__
115 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
116 root 1.94 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
117     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
118 root 1.73 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
119 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
120     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
121     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
122 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
123 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
124 root 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
125     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
126 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
127 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
128 root 1.94 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
129     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
130 root 1.73 #elif __sparc || __sparc__
131 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
132     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
133     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
134 root 1.85 #elif defined __s390__ || defined __s390x__
135 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
136 root 1.85 #elif defined __mips__
137 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
138 root 1.86 #elif defined __alpha__
139 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
140     #elif defined __hppa__
141     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
142     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
143     #elif defined __ia64__
144     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
145 root 1.52 #endif
146     #endif
147     #endif
148    
149     #ifndef ECB_MEMORY_FENCE
150 root 1.93 #if ECB_GCC_VERSION(4,7)
151 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
152 root 1.93 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
153 root 1.102 /*#elif defined __clang && __has_feature (cxx_atomic)*/
154 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
155 root 1.102 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/
156 root 1.93 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
157 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
158 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
159     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
160     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
161     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
162     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
163 root 1.85 #elif defined _WIN32
164 root 1.55 #include <WinNT.h>
165 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
166 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
167     #include <mbarrier.h>
168     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
169     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
170     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
171 root 1.82 #elif __xlC__
172 root 1.83 #define ECB_MEMORY_FENCE __sync ()
173 root 1.52 #endif
174     #endif
175    
176 root 1.53 #ifndef ECB_MEMORY_FENCE
177 root 1.94 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
178     /* we assume that these memory fences work on all variables/all memory accesses, */
179     /* not just C11 atomics and atomic accesses */
180     #include <stdatomic.h>
181 root 1.97 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
182     /* any fence other than seq_cst, which isn't very efficient for us. */
183     /* Why that is, we don't know - either the C11 memory model is quite useless */
184     /* for most usages, or gcc and clang have a bug */
185     /* I *currently* lean towards the latter, and inefficiently implement */
186     /* all three of ecb's fences as a seq_cst fence */
187 root 1.94 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
188     #endif
189     #endif
190    
191     #ifndef ECB_MEMORY_FENCE
192 root 1.62 #if !ECB_AVOID_PTHREADS
193     /*
194     * if you get undefined symbol references to pthread_mutex_lock,
195     * or failure to find pthread.h, then you should implement
196     * the ECB_MEMORY_FENCE operations for your cpu/compiler
197     * OR provide pthread.h and link against the posix thread library
198     * of your system.
199     */
200     #include <pthread.h>
201     #define ECB_NEEDS_PTHREADS 1
202     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
203 root 1.52
204 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
205     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
206     #endif
207     #endif
208    
209 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
210 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
211 root 1.62 #endif
212    
213 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
214 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
215     #endif
216    
217     /*****************************************************************************/
218    
219 root 1.39 #if __cplusplus
220 root 1.46 #define ecb_inline static inline
221 root 1.38 #elif ECB_GCC_VERSION(2,5)
222 root 1.46 #define ecb_inline static __inline__
223 root 1.39 #elif ECB_C99
224 root 1.46 #define ecb_inline static inline
225 root 1.29 #else
226 root 1.46 #define ecb_inline static
227 root 1.38 #endif
228    
229     #if ECB_GCC_VERSION(3,3)
230     #define ecb_restrict __restrict__
231 root 1.39 #elif ECB_C99
232 root 1.38 #define ecb_restrict restrict
233     #else
234     #define ecb_restrict
235 root 1.4 #endif
236    
237 root 1.38 typedef int ecb_bool;
238    
239 root 1.8 #define ECB_CONCAT_(a, b) a ## b
240     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
241     #define ECB_STRINGIFY_(a) # a
242     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
243    
244 root 1.46 #define ecb_function_ ecb_inline
245 root 1.3
246 root 1.1 #if ECB_GCC_VERSION(3,1)
247 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
248     #define ecb_is_constant(expr) __builtin_constant_p (expr)
249     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
250     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
251     #else
252     #define ecb_attribute(attrlist)
253     #define ecb_is_constant(expr) 0
254     #define ecb_expect(expr,value) (expr)
255     #define ecb_prefetch(addr,rw,locality)
256 root 1.1 #endif
257    
258 root 1.2 /* no emulation for ecb_decltype */
259 root 1.1 #if ECB_GCC_VERSION(4,5)
260 root 1.37 #define ecb_decltype(x) __decltype(x)
261 root 1.1 #elif ECB_GCC_VERSION(3,0)
262 root 1.39 #define ecb_decltype(x) __typeof(x)
263 root 1.1 #endif
264    
265 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
266     #define ecb_unused ecb_attribute ((__unused__))
267     #define ecb_const ecb_attribute ((__const__))
268     #define ecb_pure ecb_attribute ((__pure__))
269 root 1.35
270 root 1.90 #if ECB_C11
271     #define ecb_noreturn _Noreturn
272     #else
273     #define ecb_noreturn ecb_attribute ((__noreturn__))
274     #endif
275    
276 root 1.35 #if ECB_GCC_VERSION(4,3)
277 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
278     #define ecb_hot ecb_attribute ((__hot__))
279     #define ecb_cold ecb_attribute ((__cold__))
280 root 1.35 #else
281     #define ecb_artificial
282     #define ecb_hot
283     #define ecb_cold
284     #endif
285 root 1.1
286 root 1.39 /* put around conditional expressions if you are very sure that the */
287     /* expression is mostly true or mostly false. note that these return */
288     /* booleans, not the expression. */
289 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
290     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
291 root 1.36 /* for compatibility to the rest of the world */
292 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
293     #define ecb_unlikely(expr) ecb_expect_false (expr)
294 root 1.1
295 root 1.3 /* count trailing zero bits and count # of one bits */
296 root 1.1 #if ECB_GCC_VERSION(3,4)
297 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
298     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
299     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
300 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
301 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
302 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
303 root 1.49 /* no popcountll */
304 root 1.1 #else
305 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
306     ecb_function_ int
307 root 1.35 ecb_ctz32 (uint32_t x)
308     {
309     int r = 0;
310    
311 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
312 root 1.35
313 root 1.50 #if ECB_branchless_on_i386
314     r += !!(x & 0xaaaaaaaa) << 0;
315     r += !!(x & 0xcccccccc) << 1;
316     r += !!(x & 0xf0f0f0f0) << 2;
317     r += !!(x & 0xff00ff00) << 3;
318     r += !!(x & 0xffff0000) << 4;
319     #else
320 root 1.35 if (x & 0xaaaaaaaa) r += 1;
321     if (x & 0xcccccccc) r += 2;
322     if (x & 0xf0f0f0f0) r += 4;
323     if (x & 0xff00ff00) r += 8;
324     if (x & 0xffff0000) r += 16;
325 root 1.50 #endif
326 root 1.35
327     return r;
328     }
329    
330 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
331     ecb_function_ int
332     ecb_ctz64 (uint64_t x)
333     {
334     int shift = x & 0xffffffffU ? 0 : 32;
335 root 1.50 return ecb_ctz32 (x >> shift) + shift;
336 root 1.49 }
337    
338 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
339     ecb_function_ int
340 root 1.35 ecb_popcount32 (uint32_t x)
341     {
342     x -= (x >> 1) & 0x55555555;
343     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
344     x = ((x >> 4) + x) & 0x0f0f0f0f;
345     x *= 0x01010101;
346 root 1.1
347 root 1.35 return x >> 24;
348     }
349 root 1.49
350     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
351     ecb_function_ int ecb_ld32 (uint32_t x)
352     {
353 root 1.50 int r = 0;
354 root 1.49
355 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
356     if (x >> 8) { x >>= 8; r += 8; }
357     if (x >> 4) { x >>= 4; r += 4; }
358     if (x >> 2) { x >>= 2; r += 2; }
359     if (x >> 1) { r += 1; }
360 root 1.49
361     return r;
362     }
363    
364     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
365     ecb_function_ int ecb_ld64 (uint64_t x)
366     {
367 root 1.50 int r = 0;
368 root 1.49
369 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
370 root 1.49
371 root 1.50 return r + ecb_ld32 (x);
372 root 1.49 }
373 root 1.1 #endif
374    
375 root 1.88 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
376     ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
377     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
378     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
379    
380 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
381 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
382     {
383     return ( (x * 0x0802U & 0x22110U)
384     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
385     }
386    
387 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
388 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
389     {
390     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
391     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
392     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
393     x = ( x >> 8 ) | ( x << 8);
394    
395     return x;
396     }
397    
398 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
399 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
400     {
401     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
402     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
403     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
404     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
405     x = ( x >> 16 ) | ( x << 16);
406    
407     return x;
408     }
409    
410 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
411     /* so for this version we are lazy */
412     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
413     ecb_function_ int
414     ecb_popcount64 (uint64_t x)
415     {
416     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
417     }
418    
419 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
420     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
421     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
422     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
423     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
424     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
425     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
426     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
427    
428     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
429     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
430     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
431     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
432     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
433     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
434     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
435     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
436    
437 root 1.13 #if ECB_GCC_VERSION(4,3)
438 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
439     #define ecb_bswap32(x) __builtin_bswap32 (x)
440     #define ecb_bswap64(x) __builtin_bswap64 (x)
441 root 1.13 #else
442 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
443     ecb_function_ uint16_t
444     ecb_bswap16 (uint16_t x)
445 root 1.49 {
446 root 1.50 return ecb_rotl16 (x, 8);
447 root 1.49 }
448    
449 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
450     ecb_function_ uint32_t
451 root 1.35 ecb_bswap32 (uint32_t x)
452     {
453 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
454 root 1.35 }
455    
456 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
457     ecb_function_ uint64_t
458     ecb_bswap64 (uint64_t x)
459 root 1.35 {
460 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
461 root 1.35 }
462 root 1.13 #endif
463    
464     #if ECB_GCC_VERSION(4,5)
465 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
466 root 1.13 #else
467 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
468 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
469     ecb_inline void ecb_unreachable (void) { }
470 root 1.13 #endif
471    
472 root 1.41 /* try to tell the compiler that some condition is definitely true */
473 root 1.100 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
474 root 1.41
475 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
476     ecb_inline unsigned char
477 root 1.23 ecb_byteorder_helper (void)
478 root 1.3 {
479 root 1.98 /* the union code still generates code under pressure in gcc, */
480     /* but less than using pointers, and always seem to */
481     /* successfully return a constant. */
482     /* the reason why we have this horrible preprocessor mess */
483 root 1.99 /* is to avoid it in all cases, at least on common architectures */
484     /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
485 root 1.98 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
486     return 0x44;
487     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
488     return 0x44;
489     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
490     retrurn 0x11;
491     #else
492     union
493     {
494     uint32_t i;
495     uint8_t c;
496     } u = { 0x11223344 };
497     return u.c;
498     #endif
499 root 1.3 }
500    
501 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
502     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
503     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
504     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
505 root 1.3
506 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
507 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
508 root 1.31 #else
509 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
510 root 1.31 #endif
511 root 1.21
512 sf-exg 1.68 #if __cplusplus
513     template<typename T>
514     static inline T ecb_div_rd (T val, T div)
515     {
516     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
517     }
518     template<typename T>
519     static inline T ecb_div_ru (T val, T div)
520     {
521     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
522     }
523     #else
524     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
525     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
526     #endif
527 sf-exg 1.67
528 root 1.5 #if ecb_cplusplus_does_not_suck
529 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
530 root 1.35 template<typename T, int N>
531     static inline int ecb_array_length (const T (&arr)[N])
532     {
533     return N;
534     }
535 root 1.5 #else
536 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
537 root 1.5 #endif
538    
539 root 1.102 #if __STDC_IEC_559__
540     // we assume this is defined for most C and many C++ compilers
541     ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
542     ecb_inline ecb_bool ecb_float_ieee (void) { return 1; }
543     ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
544     ecb_inline ecb_bool ecb_double_ieee (void) { return 1; }
545     #elif ECB_CPP
546     #include <limits>
547     ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
548     ecb_inline ecb_bool ecb_float_ieee (void) { return std::numeric_limits<float >::is_iec559; }
549     ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
550     ecb_inline ecb_bool ecb_double_ieee (void) { return std::numeric_limits<double>::is_iec559; }
551     #else
552     ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
553     ecb_inline ecb_bool ecb_float_ieee (void) { return 0; }
554     ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
555     ecb_inline ecb_bool ecb_double_ieee (void) { return 0; }
556     #endif
557    
558 root 1.103 /*******************************************************************************/
559     /* floating point stuff, can be disabled by defining ECB_NO_FP */
560    
561     #ifndef ECB_NO_FP
562    
563     /* basically, everything uses "ieee pure-endian" floating point numbers */
564     /* the only noteworthy exception is ancient armle, which uses order 43218765 */
565     #if 0 \
566     || __i386 || __i386__ \
567     || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
568     || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
569     || defined __arm__ && defined __ARM_EABI__ \
570     || defined __s390__ || defined __s390x__ \
571     || defined __mips__ \
572     || defined __alpha__ \
573     || defined __hppa__ \
574     || defined __ia64__ \
575     || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
576     #define ECB_STDFP 1
577     #else
578     #define ECB_STDFP 0
579     #endif
580    
581     // convert a float to ieee single/binary32
582     ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
583     ecb_function_ uint32_t
584     ecb_float_to_binary32 (float x)
585     {
586     uint32_t r;
587    
588     #if ECB_STDFP
589     ((char *)&r) [0] = ((char *)&x)[0];
590     ((char *)&r) [1] = ((char *)&x)[1];
591     ((char *)&r) [2] = ((char *)&x)[2];
592     ((char *)&r) [3] = ((char *)&x)[3];
593     #else
594     /* slow emulation, works for anything but nan's and -0 */
595     ECB_EXTERN_C float frexpf (float v, int *e);
596     uint32_t m;
597     int e;
598    
599     if (x == 0e0f ) return 0;
600     if (x > +3.40282346638528860e+38f) return 0x7f800000U;
601     if (x < -3.40282346638528860e+38f) return 0xff800000U;
602    
603     m = frexpf (x, &e) * 0x1000000U;
604    
605     r = m & 0x80000000U;
606    
607     if (r)
608     m = -m;
609    
610     if (e < -125)
611     {
612     m &= 0xffffffU;
613     m >>= (-125 - e);
614     e = -126;
615     }
616    
617     r |= (e + 126) << 23;
618     r |= m & 0x7fffffU;
619     #endif
620    
621     return r;
622     }
623    
624     // converts a ieee single/binary32 to a float
625     ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
626     ecb_function_ float
627     ecb_binary32_to_float (uint32_t x)
628     {
629     float r;
630    
631     #if ECB_STDFP
632     ((char *)&r) [0] = ((char *)&x)[0];
633     ((char *)&r) [1] = ((char *)&x)[1];
634     ((char *)&r) [2] = ((char *)&x)[2];
635     ((char *)&r) [3] = ((char *)&x)[3];
636     #else
637     /* emulation, only works for normals and subnormals and +0 */
638     ECB_EXTERN_C float ldexpf (float x, int e);
639    
640     int neg = x >> 31;
641     int e = (x >> 23) & 0xffU;
642    
643     x &= 0x7fffffU;
644    
645     if (e)
646     x |= 0x800000U;
647    
648     /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
649     r = ldexpf (x * (1.f / 0x1000000U), e - 126);
650    
651     r = neg ? -r : r;
652     #endif
653    
654     return r;
655     }
656    
657     ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
658     ecb_function_ uint64_t
659     ecb_double_to_binary64 (double x)
660     {
661     }
662    
663     #endif
664 root 1.102
665 root 1.1 #endif
666