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Revision: 1.145
Committed: Fri Oct 17 11:05:33 2014 UTC (9 years, 8 months ago) by root
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Branch: MAIN
Changes since 1.144: +3 -2 lines
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2014 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
6 * 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 * Alternatively, the contents of this file may be used under the terms of
30 * the GNU General Public License ("GPL") version 2 or any later version,
31 * in which case the provisions of the GPL are applicable instead of
32 * the above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the BSD license, indicate your decision
35 * by deleting the provisions above and replace them with the notice
36 * and other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file under
38 * either the BSD or the GPL.
39 */
40
41 #ifndef ECB_H
42 #define ECB_H
43
44 /* 16 bits major, 16 bits minor */
45 #define ECB_VERSION 0x00010004
46
47 #ifdef _WIN32
48 typedef signed char int8_t;
49 typedef unsigned char uint8_t;
50 typedef signed short int16_t;
51 typedef unsigned short uint16_t;
52 typedef signed int int32_t;
53 typedef unsigned int uint32_t;
54 #if __GNUC__
55 typedef signed long long int64_t;
56 typedef unsigned long long uint64_t;
57 #else /* _MSC_VER || __BORLANDC__ */
58 typedef signed __int64 int64_t;
59 typedef unsigned __int64 uint64_t;
60 #endif
61 #ifdef _WIN64
62 #define ECB_PTRSIZE 8
63 typedef uint64_t uintptr_t;
64 typedef int64_t intptr_t;
65 #else
66 #define ECB_PTRSIZE 4
67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t;
69 #endif
70 #else
71 #include <inttypes.h>
72 #if UINTMAX_MAX > 0xffffffffU
73 #define ECB_PTRSIZE 8
74 #else
75 #define ECB_PTRSIZE 4
76 #endif
77 #endif
78
79 /* work around x32 idiocy by defining proper macros */
80 #if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
85 #endif
86 #endif
87
88 /* many compilers define _GNUC_ to some versions but then only implement
89 * what their idiot authors think are the "more important" extensions,
90 * causing enormous grief in return for some better fake benchmark numbers.
91 * or so.
92 * we try to detect these and simply assume they are not gcc - if they have
93 * an issue with that they should have done it right in the first place.
94 */
95 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
96 #define ECB_GCC_VERSION(major,minor) 0
97 #else
98 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
99 #endif
100
101 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
102
103 #if __clang__ && defined(__has_builtin)
104 #define ECB_CLANG_BUILTIN(x) __has_builtin(x)
105 #else
106 #define ECB_CLANG_BUILTIN(x) 0
107 #endif
108
109 #if __clang__ && defined(__has_extension)
110 #define ECB_CLANG_EXTENSION(x) __has_extension(x)
111 #else
112 #define ECB_CLANG_EXTENSION(x) 0
113 #endif
114
115 #define ECB_CPP (__cplusplus+0)
116 #define ECB_CPP11 (__cplusplus >= 201103L)
117
118 #if ECB_CPP
119 #define ECB_C 0
120 #define ECB_STDC_VERSION 0
121 #else
122 #define ECB_C 1
123 #define ECB_STDC_VERSION __STDC_VERSION__
124 #endif
125
126 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
127 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
128
129 #if ECB_CPP
130 #define ECB_EXTERN_C extern "C"
131 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
132 #define ECB_EXTERN_C_END }
133 #else
134 #define ECB_EXTERN_C extern
135 #define ECB_EXTERN_C_BEG
136 #define ECB_EXTERN_C_END
137 #endif
138
139 /*****************************************************************************/
140
141 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
142 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
143
144 #if ECB_NO_THREADS
145 #define ECB_NO_SMP 1
146 #endif
147
148 #if ECB_NO_SMP
149 #define ECB_MEMORY_FENCE do { } while (0)
150 #endif
151
152 #ifndef ECB_MEMORY_FENCE
153 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
154 #if __i386 || __i386__
155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
156 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
157 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
158 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
160 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
162 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
164 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
165 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
166 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
167 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
168 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
170 #elif __aarch64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
172 #elif (__sparc || __sparc__) && !__sparcv8
173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
174 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
175 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
176 #elif defined __s390__ || defined __s390x__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
178 #elif defined __mips__
179 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
180 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
182 #elif defined __alpha__
183 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
184 #elif defined __hppa__
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
186 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
187 #elif defined __ia64__
188 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
189 #elif defined __m68k__
190 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
191 #elif defined __m88k__
192 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
193 #elif defined __sh__
194 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
195 #endif
196 #endif
197 #endif
198
199 #ifndef ECB_MEMORY_FENCE
200 #if ECB_GCC_VERSION(4,7)
201 /* see comment below (stdatomic.h) about the C11 memory model. */
202 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
203 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
204 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
205
206 #elif ECB_CLANG_EXTENSION(c_atomic)
207 /* see comment below (stdatomic.h) about the C11 memory model. */
208 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
209 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
210 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
211
212 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
213 #define ECB_MEMORY_FENCE __sync_synchronize ()
214 #elif _MSC_VER >= 1500 /* VC++ 2008 */
215 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
216 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
217 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
218 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
219 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
220 #elif _MSC_VER >= 1400 /* VC++ 2005 */
221 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
222 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
223 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
224 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
225 #elif defined _WIN32
226 #include <WinNT.h>
227 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
228 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
229 #include <mbarrier.h>
230 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
232 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
233 #elif __xlC__
234 #define ECB_MEMORY_FENCE __sync ()
235 #endif
236 #endif
237
238 #ifndef ECB_MEMORY_FENCE
239 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
240 /* we assume that these memory fences work on all variables/all memory accesses, */
241 /* not just C11 atomics and atomic accesses */
242 #include <stdatomic.h>
243 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
244 /* any fence other than seq_cst, which isn't very efficient for us. */
245 /* Why that is, we don't know - either the C11 memory model is quite useless */
246 /* for most usages, or gcc and clang have a bug */
247 /* I *currently* lean towards the latter, and inefficiently implement */
248 /* all three of ecb's fences as a seq_cst fence */
249 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
250 /* for all __atomic_thread_fence's except seq_cst */
251 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
252 #endif
253 #endif
254
255 #ifndef ECB_MEMORY_FENCE
256 #if !ECB_AVOID_PTHREADS
257 /*
258 * if you get undefined symbol references to pthread_mutex_lock,
259 * or failure to find pthread.h, then you should implement
260 * the ECB_MEMORY_FENCE operations for your cpu/compiler
261 * OR provide pthread.h and link against the posix thread library
262 * of your system.
263 */
264 #include <pthread.h>
265 #define ECB_NEEDS_PTHREADS 1
266 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
267
268 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
269 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
270 #endif
271 #endif
272
273 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
274 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
275 #endif
276
277 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
278 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
279 #endif
280
281 /*****************************************************************************/
282
283 #if __cplusplus
284 #define ecb_inline static inline
285 #elif ECB_GCC_VERSION(2,5)
286 #define ecb_inline static __inline__
287 #elif ECB_C99
288 #define ecb_inline static inline
289 #else
290 #define ecb_inline static
291 #endif
292
293 #if ECB_GCC_VERSION(3,3)
294 #define ecb_restrict __restrict__
295 #elif ECB_C99
296 #define ecb_restrict restrict
297 #else
298 #define ecb_restrict
299 #endif
300
301 typedef int ecb_bool;
302
303 #define ECB_CONCAT_(a, b) a ## b
304 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
305 #define ECB_STRINGIFY_(a) # a
306 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
307
308 #define ecb_function_ ecb_inline
309
310 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
311 #define ecb_attribute(attrlist) __attribute__ (attrlist)
312 #else
313 #define ecb_attribute(attrlist)
314 #endif
315
316 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
317 #define ecb_is_constant(expr) __builtin_constant_p (expr)
318 #else
319 /* possible C11 impl for integral types
320 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
321 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
322
323 #define ecb_is_constant(expr) 0
324 #endif
325
326 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
327 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
328 #else
329 #define ecb_expect(expr,value) (expr)
330 #endif
331
332 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
333 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
334 #else
335 #define ecb_prefetch(addr,rw,locality)
336 #endif
337
338 /* no emulation for ecb_decltype */
339 #if ECB_CPP11
340 // older implementations might have problems with decltype(x)::type, work around it
341 struct ecb_decltype_t { typedef T type; };
342 #define ecb_decltype(x) ecb_decltype_t<decltype(x)>::type
343 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
344 #define ecb_decltype(x) __typeof__ (x)
345 #endif
346
347 #if _MSC_VER >= 1300
348 #define ecb_deprecated __declspec(deprecated)
349 #else
350 #define ecb_deprecated ecb_attribute ((__deprecated__))
351 #endif
352
353 #define ecb_noinline ecb_attribute ((__noinline__))
354 #define ecb_unused ecb_attribute ((__unused__))
355 #define ecb_const ecb_attribute ((__const__))
356 #define ecb_pure ecb_attribute ((__pure__))
357
358 /* TODO http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
359 #if ECB_C11 || __IBMC_NORETURN
360 /* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */
361 #define ecb_noreturn _Noreturn
362 #else
363 #define ecb_noreturn ecb_attribute ((__noreturn__))
364 #endif
365
366 #if ECB_GCC_VERSION(4,3)
367 #define ecb_artificial ecb_attribute ((__artificial__))
368 #define ecb_hot ecb_attribute ((__hot__))
369 #define ecb_cold ecb_attribute ((__cold__))
370 #else
371 #define ecb_artificial
372 #define ecb_hot
373 #define ecb_cold
374 #endif
375
376 /* put around conditional expressions if you are very sure that the */
377 /* expression is mostly true or mostly false. note that these return */
378 /* booleans, not the expression. */
379 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
380 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
381 /* for compatibility to the rest of the world */
382 #define ecb_likely(expr) ecb_expect_true (expr)
383 #define ecb_unlikely(expr) ecb_expect_false (expr)
384
385 /* count trailing zero bits and count # of one bits */
386 #if ECB_GCC_VERSION(3,4) \
387 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
388 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
389 && ECB_CLANG_BUILTIN(__builtin_popcount))
390 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
391 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
392 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
393 #define ecb_ctz32(x) __builtin_ctz (x)
394 #define ecb_ctz64(x) __builtin_ctzll (x)
395 #define ecb_popcount32(x) __builtin_popcount (x)
396 /* no popcountll */
397 #else
398 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
399 ecb_function_ int
400 ecb_ctz32 (uint32_t x)
401 {
402 int r = 0;
403
404 x &= ~x + 1; /* this isolates the lowest bit */
405
406 #if ECB_branchless_on_i386
407 r += !!(x & 0xaaaaaaaa) << 0;
408 r += !!(x & 0xcccccccc) << 1;
409 r += !!(x & 0xf0f0f0f0) << 2;
410 r += !!(x & 0xff00ff00) << 3;
411 r += !!(x & 0xffff0000) << 4;
412 #else
413 if (x & 0xaaaaaaaa) r += 1;
414 if (x & 0xcccccccc) r += 2;
415 if (x & 0xf0f0f0f0) r += 4;
416 if (x & 0xff00ff00) r += 8;
417 if (x & 0xffff0000) r += 16;
418 #endif
419
420 return r;
421 }
422
423 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
424 ecb_function_ int
425 ecb_ctz64 (uint64_t x)
426 {
427 int shift = x & 0xffffffffU ? 0 : 32;
428 return ecb_ctz32 (x >> shift) + shift;
429 }
430
431 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
432 ecb_function_ int
433 ecb_popcount32 (uint32_t x)
434 {
435 x -= (x >> 1) & 0x55555555;
436 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
437 x = ((x >> 4) + x) & 0x0f0f0f0f;
438 x *= 0x01010101;
439
440 return x >> 24;
441 }
442
443 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
444 ecb_function_ int ecb_ld32 (uint32_t x)
445 {
446 int r = 0;
447
448 if (x >> 16) { x >>= 16; r += 16; }
449 if (x >> 8) { x >>= 8; r += 8; }
450 if (x >> 4) { x >>= 4; r += 4; }
451 if (x >> 2) { x >>= 2; r += 2; }
452 if (x >> 1) { r += 1; }
453
454 return r;
455 }
456
457 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
458 ecb_function_ int ecb_ld64 (uint64_t x)
459 {
460 int r = 0;
461
462 if (x >> 32) { x >>= 32; r += 32; }
463
464 return r + ecb_ld32 (x);
465 }
466 #endif
467
468 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
469 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
470 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
471 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
472
473 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
474 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
475 {
476 return ( (x * 0x0802U & 0x22110U)
477 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
478 }
479
480 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
481 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
482 {
483 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
484 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
485 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
486 x = ( x >> 8 ) | ( x << 8);
487
488 return x;
489 }
490
491 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
492 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
493 {
494 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
495 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
496 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
497 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
498 x = ( x >> 16 ) | ( x << 16);
499
500 return x;
501 }
502
503 /* popcount64 is only available on 64 bit cpus as gcc builtin */
504 /* so for this version we are lazy */
505 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
506 ecb_function_ int
507 ecb_popcount64 (uint64_t x)
508 {
509 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
510 }
511
512 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
513 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
514 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
515 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
516 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
517 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
518 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
519 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
520
521 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
522 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
523 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
524 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
525 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
526 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
527 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
528 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
529
530 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
531 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
532 #define ecb_bswap32(x) __builtin_bswap32 (x)
533 #define ecb_bswap64(x) __builtin_bswap64 (x)
534 #else
535 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
536 ecb_function_ uint16_t
537 ecb_bswap16 (uint16_t x)
538 {
539 return ecb_rotl16 (x, 8);
540 }
541
542 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
543 ecb_function_ uint32_t
544 ecb_bswap32 (uint32_t x)
545 {
546 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
547 }
548
549 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
550 ecb_function_ uint64_t
551 ecb_bswap64 (uint64_t x)
552 {
553 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
554 }
555 #endif
556
557 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
558 #define ecb_unreachable() __builtin_unreachable ()
559 #else
560 /* this seems to work fine, but gcc always emits a warning for it :/ */
561 ecb_inline void ecb_unreachable (void) ecb_noreturn;
562 ecb_inline void ecb_unreachable (void) { }
563 #endif
564
565 /* try to tell the compiler that some condition is definitely true */
566 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
567
568 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
569 ecb_inline unsigned char
570 ecb_byteorder_helper (void)
571 {
572 /* the union code still generates code under pressure in gcc, */
573 /* but less than using pointers, and always seems to */
574 /* successfully return a constant. */
575 /* the reason why we have this horrible preprocessor mess */
576 /* is to avoid it in all cases, at least on common architectures */
577 /* or when using a recent enough gcc version (>= 4.6) */
578 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
579 return 0x44;
580 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
581 return 0x44;
582 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
583 return 0x11;
584 #else
585 union
586 {
587 uint32_t i;
588 uint8_t c;
589 } u = { 0x11223344 };
590 return u.c;
591 #endif
592 }
593
594 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
595 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
596 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
597 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
598
599 #if ECB_GCC_VERSION(3,0) || ECB_C99
600 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
601 #else
602 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
603 #endif
604
605 #if __cplusplus
606 template<typename T>
607 static inline T ecb_div_rd (T val, T div)
608 {
609 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
610 }
611 template<typename T>
612 static inline T ecb_div_ru (T val, T div)
613 {
614 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
615 }
616 #else
617 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
618 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
619 #endif
620
621 #if ecb_cplusplus_does_not_suck
622 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
623 template<typename T, int N>
624 static inline int ecb_array_length (const T (&arr)[N])
625 {
626 return N;
627 }
628 #else
629 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
630 #endif
631
632 /*******************************************************************************/
633 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
634
635 /* basically, everything uses "ieee pure-endian" floating point numbers */
636 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
637 #if 0 \
638 || __i386 || __i386__ \
639 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
640 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
641 || defined __s390__ || defined __s390x__ \
642 || defined __mips__ \
643 || defined __alpha__ \
644 || defined __hppa__ \
645 || defined __ia64__ \
646 || defined __m68k__ \
647 || defined __m88k__ \
648 || defined __sh__ \
649 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
650 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
651 || defined __aarch64__
652 #define ECB_STDFP 1
653 #include <string.h> /* for memcpy */
654 #else
655 #define ECB_STDFP 0
656 #endif
657
658 #ifndef ECB_NO_LIBM
659
660 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
661
662 /* only the oldest of old doesn't have this one. solaris. */
663 #ifdef INFINITY
664 #define ECB_INFINITY INFINITY
665 #else
666 #define ECB_INFINITY HUGE_VAL
667 #endif
668
669 #ifdef NAN
670 #define ECB_NAN NAN
671 #else
672 #define ECB_NAN ECB_INFINITY
673 #endif
674
675 /* converts an ieee half/binary16 to a float */
676 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
677 ecb_function_ float
678 ecb_binary16_to_float (uint16_t x)
679 {
680 int e = (x >> 10) & 0x1f;
681 int m = x & 0x3ff;
682 float r;
683
684 if (!e ) r = ldexpf (m , -24);
685 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
686 else if (m ) r = ECB_NAN;
687 else r = ECB_INFINITY;
688
689 return x & 0x8000 ? -r : r;
690 }
691
692 /* convert a float to ieee single/binary32 */
693 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
694 ecb_function_ uint32_t
695 ecb_float_to_binary32 (float x)
696 {
697 uint32_t r;
698
699 #if ECB_STDFP
700 memcpy (&r, &x, 4);
701 #else
702 /* slow emulation, works for anything but -0 */
703 uint32_t m;
704 int e;
705
706 if (x == 0e0f ) return 0x00000000U;
707 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
708 if (x < -3.40282346638528860e+38f) return 0xff800000U;
709 if (x != x ) return 0x7fbfffffU;
710
711 m = frexpf (x, &e) * 0x1000000U;
712
713 r = m & 0x80000000U;
714
715 if (r)
716 m = -m;
717
718 if (e <= -126)
719 {
720 m &= 0xffffffU;
721 m >>= (-125 - e);
722 e = -126;
723 }
724
725 r |= (e + 126) << 23;
726 r |= m & 0x7fffffU;
727 #endif
728
729 return r;
730 }
731
732 /* converts an ieee single/binary32 to a float */
733 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
734 ecb_function_ float
735 ecb_binary32_to_float (uint32_t x)
736 {
737 float r;
738
739 #if ECB_STDFP
740 memcpy (&r, &x, 4);
741 #else
742 /* emulation, only works for normals and subnormals and +0 */
743 int neg = x >> 31;
744 int e = (x >> 23) & 0xffU;
745
746 x &= 0x7fffffU;
747
748 if (e)
749 x |= 0x800000U;
750 else
751 e = 1;
752
753 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
754 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
755
756 r = neg ? -r : r;
757 #endif
758
759 return r;
760 }
761
762 /* convert a double to ieee double/binary64 */
763 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
764 ecb_function_ uint64_t
765 ecb_double_to_binary64 (double x)
766 {
767 uint64_t r;
768
769 #if ECB_STDFP
770 memcpy (&r, &x, 8);
771 #else
772 /* slow emulation, works for anything but -0 */
773 uint64_t m;
774 int e;
775
776 if (x == 0e0 ) return 0x0000000000000000U;
777 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
778 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
779 if (x != x ) return 0X7ff7ffffffffffffU;
780
781 m = frexp (x, &e) * 0x20000000000000U;
782
783 r = m & 0x8000000000000000;;
784
785 if (r)
786 m = -m;
787
788 if (e <= -1022)
789 {
790 m &= 0x1fffffffffffffU;
791 m >>= (-1021 - e);
792 e = -1022;
793 }
794
795 r |= ((uint64_t)(e + 1022)) << 52;
796 r |= m & 0xfffffffffffffU;
797 #endif
798
799 return r;
800 }
801
802 /* converts an ieee double/binary64 to a double */
803 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
804 ecb_function_ double
805 ecb_binary64_to_double (uint64_t x)
806 {
807 double r;
808
809 #if ECB_STDFP
810 memcpy (&r, &x, 8);
811 #else
812 /* emulation, only works for normals and subnormals and +0 */
813 int neg = x >> 63;
814 int e = (x >> 52) & 0x7ffU;
815
816 x &= 0xfffffffffffffU;
817
818 if (e)
819 x |= 0x10000000000000U;
820 else
821 e = 1;
822
823 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
824 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
825
826 r = neg ? -r : r;
827 #endif
828
829 return r;
830 }
831
832 #endif
833
834 #endif
835