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Revision: 1.171
Committed: Tue Nov 24 19:46:20 2015 UTC (8 years, 6 months ago) by root
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2015 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 0x00010005
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 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
80 #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
81
82 /* work around x32 idiocy by defining proper macros */
83 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
84 #if _ILP32
85 #define ECB_AMD64_X32 1
86 #else
87 #define ECB_AMD64 1
88 #endif
89 #endif
90
91 /* many compilers define _GNUC_ to some versions but then only implement
92 * what their idiot authors think are the "more important" extensions,
93 * causing enormous grief in return for some better fake benchmark numbers.
94 * or so.
95 * we try to detect these and simply assume they are not gcc - if they have
96 * an issue with that they should have done it right in the first place.
97 */
98 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
99 #define ECB_GCC_VERSION(major,minor) 0
100 #else
101 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
102 #endif
103
104 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
105
106 #if __clang__ && defined __has_builtin
107 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
108 #else
109 #define ECB_CLANG_BUILTIN(x) 0
110 #endif
111
112 #if __clang__ && defined __has_extension
113 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
114 #else
115 #define ECB_CLANG_EXTENSION(x) 0
116 #endif
117
118 #define ECB_CPP (__cplusplus+0)
119 #define ECB_CPP11 (__cplusplus >= 201103L)
120
121 #if ECB_CPP
122 #define ECB_C 0
123 #define ECB_STDC_VERSION 0
124 #else
125 #define ECB_C 1
126 #define ECB_STDC_VERSION __STDC_VERSION__
127 #endif
128
129 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
130 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
131
132 #if ECB_CPP
133 #define ECB_EXTERN_C extern "C"
134 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
135 #define ECB_EXTERN_C_END }
136 #else
137 #define ECB_EXTERN_C extern
138 #define ECB_EXTERN_C_BEG
139 #define ECB_EXTERN_C_END
140 #endif
141
142 /*****************************************************************************/
143
144 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
145 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
146
147 #if ECB_NO_THREADS
148 #define ECB_NO_SMP 1
149 #endif
150
151 #if ECB_NO_SMP
152 #define ECB_MEMORY_FENCE do { } while (0)
153 #endif
154
155 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
156 #if __xlC__ && ECB_CPP
157 #include <builtins.h>
158 #endif
159
160 #if 1400 <= _MSC_VER
161 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
162 #endif
163
164 #ifndef ECB_MEMORY_FENCE
165 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
166 #if __i386 || __i386__
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
168 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
169 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
170 #elif ECB_GCC_AMD64
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
172 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
173 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
174 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
175 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
176 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
177 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
178 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
179 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
180 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
182 #elif __aarch64__
183 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
184 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
186 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
187 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
188 #elif defined __s390__ || defined __s390x__
189 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
190 #elif defined __mips__
191 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
192 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
194 #elif defined __alpha__
195 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
196 #elif defined __hppa__
197 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
198 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
199 #elif defined __ia64__
200 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
201 #elif defined __m68k__
202 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
203 #elif defined __m88k__
204 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
205 #elif defined __sh__
206 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
207 #endif
208 #endif
209 #endif
210
211 #ifndef ECB_MEMORY_FENCE
212 #if ECB_GCC_VERSION(4,7)
213 /* see comment below (stdatomic.h) about the C11 memory model. */
214 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
215 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
216 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
217
218 #elif ECB_CLANG_EXTENSION(c_atomic)
219 /* see comment below (stdatomic.h) about the C11 memory model. */
220 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
221 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
222 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
223
224 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
225 #define ECB_MEMORY_FENCE __sync_synchronize ()
226 #elif _MSC_VER >= 1500 /* VC++ 2008 */
227 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
228 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
229 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
230 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
231 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
232 #elif _MSC_VER >= 1400 /* VC++ 2005 */
233 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
234 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
235 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
236 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
237 #elif defined _WIN32
238 #include <WinNT.h>
239 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
240 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
241 #include <mbarrier.h>
242 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
243 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
244 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
245 #elif __xlC__
246 #define ECB_MEMORY_FENCE __sync ()
247 #endif
248 #endif
249
250 #ifndef ECB_MEMORY_FENCE
251 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
252 /* we assume that these memory fences work on all variables/all memory accesses, */
253 /* not just C11 atomics and atomic accesses */
254 #include <stdatomic.h>
255 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
256 /* any fence other than seq_cst, which isn't very efficient for us. */
257 /* Why that is, we don't know - either the C11 memory model is quite useless */
258 /* for most usages, or gcc and clang have a bug */
259 /* I *currently* lean towards the latter, and inefficiently implement */
260 /* all three of ecb's fences as a seq_cst fence */
261 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
262 /* for all __atomic_thread_fence's except seq_cst */
263 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
264 #endif
265 #endif
266
267 #ifndef ECB_MEMORY_FENCE
268 #if !ECB_AVOID_PTHREADS
269 /*
270 * if you get undefined symbol references to pthread_mutex_lock,
271 * or failure to find pthread.h, then you should implement
272 * the ECB_MEMORY_FENCE operations for your cpu/compiler
273 * OR provide pthread.h and link against the posix thread library
274 * of your system.
275 */
276 #include <pthread.h>
277 #define ECB_NEEDS_PTHREADS 1
278 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
279
280 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
281 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
282 #endif
283 #endif
284
285 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
286 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
287 #endif
288
289 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
290 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
291 #endif
292
293 /*****************************************************************************/
294
295 #if ECB_CPP
296 #define ecb_inline static inline
297 #elif ECB_GCC_VERSION(2,5)
298 #define ecb_inline static __inline__
299 #elif ECB_C99
300 #define ecb_inline static inline
301 #else
302 #define ecb_inline static
303 #endif
304
305 #if ECB_GCC_VERSION(3,3)
306 #define ecb_restrict __restrict__
307 #elif ECB_C99
308 #define ecb_restrict restrict
309 #else
310 #define ecb_restrict
311 #endif
312
313 typedef int ecb_bool;
314
315 #define ECB_CONCAT_(a, b) a ## b
316 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
317 #define ECB_STRINGIFY_(a) # a
318 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
319 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
320
321 #define ecb_function_ ecb_inline
322
323 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
324 #define ecb_attribute(attrlist) __attribute__ (attrlist)
325 #else
326 #define ecb_attribute(attrlist)
327 #endif
328
329 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
330 #define ecb_is_constant(expr) __builtin_constant_p (expr)
331 #else
332 /* possible C11 impl for integral types
333 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
334 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
335
336 #define ecb_is_constant(expr) 0
337 #endif
338
339 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
340 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
341 #else
342 #define ecb_expect(expr,value) (expr)
343 #endif
344
345 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
346 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
347 #else
348 #define ecb_prefetch(addr,rw,locality)
349 #endif
350
351 /* no emulation for ecb_decltype */
352 #if ECB_CPP11
353 // older implementations might have problems with decltype(x)::type, work around it
354 template<class T> struct ecb_decltype_t { typedef T type; };
355 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
356 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
357 #define ecb_decltype(x) __typeof__ (x)
358 #endif
359
360 #if _MSC_VER >= 1300
361 #define ecb_deprecated __declspec (deprecated)
362 #else
363 #define ecb_deprecated ecb_attribute ((__deprecated__))
364 #endif
365
366 #if _MSC_VER >= 1500
367 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
368 #elif ECB_GCC_VERSION(4,5)
369 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
370 #else
371 #define ecb_deprecated_message(msg) ecb_deprecated
372 #endif
373
374 #if _MSC_VER >= 1400
375 #define ecb_noinline __declspec (noinline)
376 #else
377 #define ecb_noinline ecb_attribute ((__noinline__))
378 #endif
379
380 #define ecb_unused ecb_attribute ((__unused__))
381 #define ecb_const ecb_attribute ((__const__))
382 #define ecb_pure ecb_attribute ((__pure__))
383
384 #if ECB_C11 || __IBMC_NORETURN
385 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
386 #define ecb_noreturn _Noreturn
387 #elif ECB_CPP11
388 #define ecb_noreturn [[noreturn]]
389 #elif _MSC_VER >= 1200
390 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
391 #define ecb_noreturn __declspec (noreturn)
392 #else
393 #define ecb_noreturn ecb_attribute ((__noreturn__))
394 #endif
395
396 #if ECB_GCC_VERSION(4,3)
397 #define ecb_artificial ecb_attribute ((__artificial__))
398 #define ecb_hot ecb_attribute ((__hot__))
399 #define ecb_cold ecb_attribute ((__cold__))
400 #else
401 #define ecb_artificial
402 #define ecb_hot
403 #define ecb_cold
404 #endif
405
406 /* put around conditional expressions if you are very sure that the */
407 /* expression is mostly true or mostly false. note that these return */
408 /* booleans, not the expression. */
409 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
410 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
411 /* for compatibility to the rest of the world */
412 #define ecb_likely(expr) ecb_expect_true (expr)
413 #define ecb_unlikely(expr) ecb_expect_false (expr)
414
415 /* count trailing zero bits and count # of one bits */
416 #if ECB_GCC_VERSION(3,4) \
417 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
418 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
419 && ECB_CLANG_BUILTIN(__builtin_popcount))
420 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
421 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
422 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
423 #define ecb_ctz32(x) __builtin_ctz (x)
424 #define ecb_ctz64(x) __builtin_ctzll (x)
425 #define ecb_popcount32(x) __builtin_popcount (x)
426 /* no popcountll */
427 #else
428 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
429 ecb_function_ ecb_const int
430 ecb_ctz32 (uint32_t x)
431 {
432 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
433 unsigned long r = 0;
434 _BitScanForward (&r, x);
435 return (int)r;
436 #else
437 int r = 0;
438
439 x &= ~x + 1; /* this isolates the lowest bit */
440
441 #if ECB_branchless_on_i386
442 r += !!(x & 0xaaaaaaaa) << 0;
443 r += !!(x & 0xcccccccc) << 1;
444 r += !!(x & 0xf0f0f0f0) << 2;
445 r += !!(x & 0xff00ff00) << 3;
446 r += !!(x & 0xffff0000) << 4;
447 #else
448 if (x & 0xaaaaaaaa) r += 1;
449 if (x & 0xcccccccc) r += 2;
450 if (x & 0xf0f0f0f0) r += 4;
451 if (x & 0xff00ff00) r += 8;
452 if (x & 0xffff0000) r += 16;
453 #endif
454
455 return r;
456 #endif
457 }
458
459 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
460 ecb_function_ ecb_const int
461 ecb_ctz64 (uint64_t x)
462 {
463 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
464 unsigned long r = 0;
465 _BitScanForward64 (&r, x);
466 return (int)r;
467 #else
468 int shift = x & 0xffffffff ? 0 : 32;
469 return ecb_ctz32 (x >> shift) + shift;
470 #endif
471 }
472
473 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
474 ecb_function_ ecb_const int
475 ecb_popcount32 (uint32_t x)
476 {
477 x -= (x >> 1) & 0x55555555;
478 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
479 x = ((x >> 4) + x) & 0x0f0f0f0f;
480 x *= 0x01010101;
481
482 return x >> 24;
483 }
484
485 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
486 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
487 {
488 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
489 unsigned long r = 0;
490 _BitScanReverse (&r, x);
491 return (int)r;
492 #else
493 int r = 0;
494
495 if (x >> 16) { x >>= 16; r += 16; }
496 if (x >> 8) { x >>= 8; r += 8; }
497 if (x >> 4) { x >>= 4; r += 4; }
498 if (x >> 2) { x >>= 2; r += 2; }
499 if (x >> 1) { r += 1; }
500
501 return r;
502 #endif
503 }
504
505 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
506 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
507 {
508 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
509 unsigned long r = 0;
510 _BitScanReverse64 (&r, x);
511 return (int)r;
512 #else
513 int r = 0;
514
515 if (x >> 32) { x >>= 32; r += 32; }
516
517 return r + ecb_ld32 (x);
518 #endif
519 }
520 #endif
521
522 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
523 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
524 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
525 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
526
527 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
528 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
529 {
530 return ( (x * 0x0802U & 0x22110U)
531 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
532 }
533
534 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
535 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
536 {
537 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
538 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
539 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
540 x = ( x >> 8 ) | ( x << 8);
541
542 return x;
543 }
544
545 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
546 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
547 {
548 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
549 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
550 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
551 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
552 x = ( x >> 16 ) | ( x << 16);
553
554 return x;
555 }
556
557 /* popcount64 is only available on 64 bit cpus as gcc builtin */
558 /* so for this version we are lazy */
559 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
560 ecb_function_ ecb_const int
561 ecb_popcount64 (uint64_t x)
562 {
563 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
564 }
565
566 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
567 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
568 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
569 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
570 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
571 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
572 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
573 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
574
575 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
576 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
577 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
578 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
579 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
580 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
581 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
582 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
583
584 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
585 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
586 #define ecb_bswap16(x) __builtin_bswap16 (x)
587 #else
588 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
589 #endif
590 #define ecb_bswap32(x) __builtin_bswap32 (x)
591 #define ecb_bswap64(x) __builtin_bswap64 (x)
592 #elif _MSC_VER
593 #include <stdlib.h>
594 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
595 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
596 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
597 #else
598 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
599 ecb_function_ ecb_const uint16_t
600 ecb_bswap16 (uint16_t x)
601 {
602 return ecb_rotl16 (x, 8);
603 }
604
605 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
606 ecb_function_ ecb_const uint32_t
607 ecb_bswap32 (uint32_t x)
608 {
609 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
610 }
611
612 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
613 ecb_function_ ecb_const uint64_t
614 ecb_bswap64 (uint64_t x)
615 {
616 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
617 }
618 #endif
619
620 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
621 #define ecb_unreachable() __builtin_unreachable ()
622 #else
623 /* this seems to work fine, but gcc always emits a warning for it :/ */
624 ecb_inline ecb_noreturn void ecb_unreachable (void);
625 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
626 #endif
627
628 /* try to tell the compiler that some condition is definitely true */
629 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
630
631 ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
632 ecb_inline ecb_const unsigned char
633 ecb_byteorder_helper (void)
634 {
635 /* the union code still generates code under pressure in gcc, */
636 /* but less than using pointers, and always seems to */
637 /* successfully return a constant. */
638 /* the reason why we have this horrible preprocessor mess */
639 /* is to avoid it in all cases, at least on common architectures */
640 /* or when using a recent enough gcc version (>= 4.6) */
641 #if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
642 return 0x44;
643 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
644 return 0x44;
645 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
646 return 0x11;
647 #else
648 union
649 {
650 uint32_t i;
651 uint8_t c;
652 } u = { 0x11223344 };
653 return u.c;
654 #endif
655 }
656
657 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
658 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
659 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
660 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
661
662 #if ECB_GCC_VERSION(3,0) || ECB_C99
663 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
664 #else
665 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
666 #endif
667
668 #if ECB_CPP
669 template<typename T>
670 static inline T ecb_div_rd (T val, T div)
671 {
672 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
673 }
674 template<typename T>
675 static inline T ecb_div_ru (T val, T div)
676 {
677 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
678 }
679 #else
680 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
681 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
682 #endif
683
684 #if ecb_cplusplus_does_not_suck
685 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
686 template<typename T, int N>
687 static inline int ecb_array_length (const T (&arr)[N])
688 {
689 return N;
690 }
691 #else
692 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
693 #endif
694
695 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
696 ecb_function_ ecb_const uint32_t
697 ecb_binary16_to_binary32 (uint32_t x)
698 {
699 unsigned int s = (x & 0x8000) << (31 - 15);
700 int e = (x >> 10) & 0x001f;
701 unsigned int m = x & 0x03ff;
702
703 if (ecb_expect_false (e == 31))
704 /* infinity or NaN */
705 e = 255 - (127 - 15);
706 else if (ecb_expect_false (!e))
707 {
708 if (ecb_expect_true (!m))
709 /* zero, handled by code below by forcing e to 0 */
710 e = 0 - (127 - 15);
711 else
712 {
713 /* subnormal, renormalise */
714 unsigned int s = 10 - ecb_ld32 (m);
715
716 m = (m << s) & 0x3ff; /* mask implicit bit */
717 e -= s - 1;
718 }
719 }
720
721 /* e and m now are normalised, or zero, (or inf or nan) */
722 e += 127 - 15;
723
724 return s | (e << 23) | (m << (23 - 10));
725 }
726
727 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
728 ecb_function_ ecb_const uint16_t
729 ecb_binary32_to_binary16 (uint32_t x)
730 {
731 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
732 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
733 unsigned int m = x & 0x007fffff;
734
735 x &= 0x7fffffff;
736
737 /* if it's within range of binary16 normals, use fast path */
738 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
739 {
740 /* mantissa round-to-even */
741 m += 0x00000fff + ((m >> (23 - 10)) & 1);
742
743 /* handle overflow */
744 if (ecb_expect_false (m >= 0x00800000))
745 {
746 m >>= 1;
747 e += 1;
748 }
749
750 return s | (e << 10) | (m >> (23 - 10));
751 }
752
753 /* handle large numbers and infinity */
754 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
755 return s | 0x7c00;
756
757 /* handle zero, subnormals and small numbers */
758 if (ecb_expect_true (x < 0x38800000))
759 {
760 /* zero */
761 if (ecb_expect_true (!x))
762 return s;
763
764 /* handle subnormals */
765
766 /* too small, will be zero */
767 if (e < (14 - 24)) /* might not be sharp, but is good enough */
768 return s;
769
770 m |= 0x00800000; /* make implicit bit explicit */
771
772 /* very tricky - we need to round to the nearest e (+10) bit value */
773 {
774 unsigned int bits = 14 - e;
775 unsigned int half = (1 << (bits - 1)) - 1;
776 unsigned int even = (m >> bits) & 1;
777
778 /* if this overflows, we will end up with a normalised number */
779 m = (m + half + even) >> bits;
780 }
781
782 return s | m;
783 }
784
785 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
786 m >>= 13;
787
788 return s | 0x7c00 | m | !m;
789 }
790
791 /*******************************************************************************/
792 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
793
794 /* basically, everything uses "ieee pure-endian" floating point numbers */
795 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
796 #if 0 \
797 || __i386 || __i386__ \
798 || ECB_GCC_AMD64 \
799 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
800 || defined __s390__ || defined __s390x__ \
801 || defined __mips__ \
802 || defined __alpha__ \
803 || defined __hppa__ \
804 || defined __ia64__ \
805 || defined __m68k__ \
806 || defined __m88k__ \
807 || defined __sh__ \
808 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
809 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
810 || defined __aarch64__
811 #define ECB_STDFP 1
812 #include <string.h> /* for memcpy */
813 #else
814 #define ECB_STDFP 0
815 #endif
816
817 #ifndef ECB_NO_LIBM
818
819 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
820
821 /* only the oldest of old doesn't have this one. solaris. */
822 #ifdef INFINITY
823 #define ECB_INFINITY INFINITY
824 #else
825 #define ECB_INFINITY HUGE_VAL
826 #endif
827
828 #ifdef NAN
829 #define ECB_NAN NAN
830 #else
831 #define ECB_NAN ECB_INFINITY
832 #endif
833
834 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
835 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
836 #define ecb_frexpf(x,e) frexpf ((x), (e))
837 #else
838 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
839 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
840 #endif
841
842 /* convert a float to ieee single/binary32 */
843 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
844 ecb_function_ ecb_const uint32_t
845 ecb_float_to_binary32 (float x)
846 {
847 uint32_t r;
848
849 #if ECB_STDFP
850 memcpy (&r, &x, 4);
851 #else
852 /* slow emulation, works for anything but -0 */
853 uint32_t m;
854 int e;
855
856 if (x == 0e0f ) return 0x00000000U;
857 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
858 if (x < -3.40282346638528860e+38f) return 0xff800000U;
859 if (x != x ) return 0x7fbfffffU;
860
861 m = ecb_frexpf (x, &e) * 0x1000000U;
862
863 r = m & 0x80000000U;
864
865 if (r)
866 m = -m;
867
868 if (e <= -126)
869 {
870 m &= 0xffffffU;
871 m >>= (-125 - e);
872 e = -126;
873 }
874
875 r |= (e + 126) << 23;
876 r |= m & 0x7fffffU;
877 #endif
878
879 return r;
880 }
881
882 /* converts an ieee single/binary32 to a float */
883 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
884 ecb_function_ ecb_const float
885 ecb_binary32_to_float (uint32_t x)
886 {
887 float r;
888
889 #if ECB_STDFP
890 memcpy (&r, &x, 4);
891 #else
892 /* emulation, only works for normals and subnormals and +0 */
893 int neg = x >> 31;
894 int e = (x >> 23) & 0xffU;
895
896 x &= 0x7fffffU;
897
898 if (e)
899 x |= 0x800000U;
900 else
901 e = 1;
902
903 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
904 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
905
906 r = neg ? -r : r;
907 #endif
908
909 return r;
910 }
911
912 /* convert a double to ieee double/binary64 */
913 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
914 ecb_function_ ecb_const uint64_t
915 ecb_double_to_binary64 (double x)
916 {
917 uint64_t r;
918
919 #if ECB_STDFP
920 memcpy (&r, &x, 8);
921 #else
922 /* slow emulation, works for anything but -0 */
923 uint64_t m;
924 int e;
925
926 if (x == 0e0 ) return 0x0000000000000000U;
927 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
928 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
929 if (x != x ) return 0X7ff7ffffffffffffU;
930
931 m = frexp (x, &e) * 0x20000000000000U;
932
933 r = m & 0x8000000000000000;;
934
935 if (r)
936 m = -m;
937
938 if (e <= -1022)
939 {
940 m &= 0x1fffffffffffffU;
941 m >>= (-1021 - e);
942 e = -1022;
943 }
944
945 r |= ((uint64_t)(e + 1022)) << 52;
946 r |= m & 0xfffffffffffffU;
947 #endif
948
949 return r;
950 }
951
952 /* converts an ieee double/binary64 to a double */
953 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
954 ecb_function_ ecb_const double
955 ecb_binary64_to_double (uint64_t x)
956 {
957 double r;
958
959 #if ECB_STDFP
960 memcpy (&r, &x, 8);
961 #else
962 /* emulation, only works for normals and subnormals and +0 */
963 int neg = x >> 63;
964 int e = (x >> 52) & 0x7ffU;
965
966 x &= 0xfffffffffffffU;
967
968 if (e)
969 x |= 0x10000000000000U;
970 else
971 e = 1;
972
973 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
974 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
975
976 r = neg ? -r : r;
977 #endif
978
979 return r;
980 }
981
982 /* convert a float to ieee half/binary16 */
983 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
984 ecb_function_ ecb_const uint16_t
985 ecb_float_to_binary16 (float x)
986 {
987 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
988 }
989
990 /* convert an ieee half/binary16 to float */
991 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
992 ecb_function_ ecb_const float
993 ecb_binary16_to_float (uint16_t x)
994 {
995 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
996 }
997
998 #endif
999
1000 #endif
1001