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Revision: 1.178
Committed: Mon Jun 24 22:22:59 2019 UTC (4 years, 11 months ago) by root
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Branch: MAIN
Changes since 1.177: +14 -12 lines
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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 0x00010006
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 (defined INTPTR_MAX ? INTPTR_MAX : ULONG_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 #define ECB_CPP14 (__cplusplus >= 201402L)
121 #define ECB_CPP17 (__cplusplus >= 201703L)
122
123 #if ECB_CPP
124 #define ECB_C 0
125 #define ECB_STDC_VERSION 0
126 #else
127 #define ECB_C 1
128 #define ECB_STDC_VERSION __STDC_VERSION__
129 #endif
130
131 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
132 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
133 #define ECB_C17 (ECB_STDC_VERSION >= 201710L)
134
135 #if ECB_CPP
136 #define ECB_EXTERN_C extern "C"
137 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
138 #define ECB_EXTERN_C_END }
139 #else
140 #define ECB_EXTERN_C extern
141 #define ECB_EXTERN_C_BEG
142 #define ECB_EXTERN_C_END
143 #endif
144
145 /*****************************************************************************/
146
147 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
148 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
149
150 #if ECB_NO_THREADS
151 #define ECB_NO_SMP 1
152 #endif
153
154 #if ECB_NO_SMP
155 #define ECB_MEMORY_FENCE do { } while (0)
156 #endif
157
158 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
159 #if __xlC__ && ECB_CPP
160 #include <builtins.h>
161 #endif
162
163 #if 1400 <= _MSC_VER
164 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
165 #endif
166
167 #ifndef ECB_MEMORY_FENCE
168 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
169 #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
170 #if __i386 || __i386__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
172 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
173 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
174 #elif ECB_GCC_AMD64
175 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
176 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
177 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
178 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
179 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
180 #elif defined __ARM_ARCH_2__ \
181 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
182 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
183 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
184 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
185 || defined __ARM_ARCH_5TEJ__
186 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
187 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
188 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
189 || defined __ARM_ARCH_6T2__
190 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
191 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
192 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
194 #elif __aarch64__
195 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
196 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
197 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
198 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
199 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
200 #elif defined __s390__ || defined __s390x__
201 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
202 #elif defined __mips__
203 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
204 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
205 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
206 #elif defined __alpha__
207 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
208 #elif defined __hppa__
209 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
210 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
211 #elif defined __ia64__
212 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
213 #elif defined __m68k__
214 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
215 #elif defined __m88k__
216 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
217 #elif defined __sh__
218 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
219 #endif
220 #endif
221 #endif
222
223 #ifndef ECB_MEMORY_FENCE
224 #if ECB_GCC_VERSION(4,7)
225 /* see comment below (stdatomic.h) about the C11 memory model. */
226 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
227 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
228 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
229 #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
230
231 #elif ECB_CLANG_EXTENSION(c_atomic)
232 /* see comment below (stdatomic.h) about the C11 memory model. */
233 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
234 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
235 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
236 #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
237
238 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
239 #define ECB_MEMORY_FENCE __sync_synchronize ()
240 #elif _MSC_VER >= 1500 /* VC++ 2008 */
241 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
242 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
243 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
244 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
245 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
246 #elif _MSC_VER >= 1400 /* VC++ 2005 */
247 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
248 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
249 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
250 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
251 #elif defined _WIN32
252 #include <WinNT.h>
253 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
254 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
255 #include <mbarrier.h>
256 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
257 #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
258 #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
259 #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
260 #elif __xlC__
261 #define ECB_MEMORY_FENCE __sync ()
262 #endif
263 #endif
264
265 #ifndef ECB_MEMORY_FENCE
266 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
267 /* we assume that these memory fences work on all variables/all memory accesses, */
268 /* not just C11 atomics and atomic accesses */
269 #include <stdatomic.h>
270 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
271 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
272 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
273 #endif
274 #endif
275
276 #ifndef ECB_MEMORY_FENCE
277 #if !ECB_AVOID_PTHREADS
278 /*
279 * if you get undefined symbol references to pthread_mutex_lock,
280 * or failure to find pthread.h, then you should implement
281 * the ECB_MEMORY_FENCE operations for your cpu/compiler
282 * OR provide pthread.h and link against the posix thread library
283 * of your system.
284 */
285 #include <pthread.h>
286 #define ECB_NEEDS_PTHREADS 1
287 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
288
289 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
290 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
291 #endif
292 #endif
293
294 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
295 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
296 #endif
297
298 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
299 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
300 #endif
301
302 #if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
303 #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
304 #endif
305
306 /*****************************************************************************/
307
308 #if ECB_CPP
309 #define ecb_inline static inline
310 #elif ECB_GCC_VERSION(2,5)
311 #define ecb_inline static __inline__
312 #elif ECB_C99
313 #define ecb_inline static inline
314 #else
315 #define ecb_inline static
316 #endif
317
318 #if ECB_GCC_VERSION(3,3)
319 #define ecb_restrict __restrict__
320 #elif ECB_C99
321 #define ecb_restrict restrict
322 #else
323 #define ecb_restrict
324 #endif
325
326 typedef int ecb_bool;
327
328 #define ECB_CONCAT_(a, b) a ## b
329 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
330 #define ECB_STRINGIFY_(a) # a
331 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
332 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
333
334 #define ecb_function_ ecb_inline
335
336 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
337 #define ecb_attribute(attrlist) __attribute__ (attrlist)
338 #else
339 #define ecb_attribute(attrlist)
340 #endif
341
342 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
343 #define ecb_is_constant(expr) __builtin_constant_p (expr)
344 #else
345 /* possible C11 impl for integral types
346 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
347 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
348
349 #define ecb_is_constant(expr) 0
350 #endif
351
352 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
353 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
354 #else
355 #define ecb_expect(expr,value) (expr)
356 #endif
357
358 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
359 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
360 #else
361 #define ecb_prefetch(addr,rw,locality)
362 #endif
363
364 /* no emulation for ecb_decltype */
365 #if ECB_CPP11
366 // older implementations might have problems with decltype(x)::type, work around it
367 template<class T> struct ecb_decltype_t { typedef T type; };
368 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
369 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
370 #define ecb_decltype(x) __typeof__ (x)
371 #endif
372
373 #if _MSC_VER >= 1300
374 #define ecb_deprecated __declspec (deprecated)
375 #else
376 #define ecb_deprecated ecb_attribute ((__deprecated__))
377 #endif
378
379 #if _MSC_VER >= 1500
380 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
381 #elif ECB_GCC_VERSION(4,5)
382 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
383 #else
384 #define ecb_deprecated_message(msg) ecb_deprecated
385 #endif
386
387 #if _MSC_VER >= 1400
388 #define ecb_noinline __declspec (noinline)
389 #else
390 #define ecb_noinline ecb_attribute ((__noinline__))
391 #endif
392
393 #define ecb_unused ecb_attribute ((__unused__))
394 #define ecb_const ecb_attribute ((__const__))
395 #define ecb_pure ecb_attribute ((__pure__))
396
397 #if ECB_C11 || __IBMC_NORETURN
398 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
399 #define ecb_noreturn _Noreturn
400 #elif ECB_CPP11
401 #define ecb_noreturn [[noreturn]]
402 #elif _MSC_VER >= 1200
403 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
404 #define ecb_noreturn __declspec (noreturn)
405 #else
406 #define ecb_noreturn ecb_attribute ((__noreturn__))
407 #endif
408
409 #if ECB_GCC_VERSION(4,3)
410 #define ecb_artificial ecb_attribute ((__artificial__))
411 #define ecb_hot ecb_attribute ((__hot__))
412 #define ecb_cold ecb_attribute ((__cold__))
413 #else
414 #define ecb_artificial
415 #define ecb_hot
416 #define ecb_cold
417 #endif
418
419 /* put around conditional expressions if you are very sure that the */
420 /* expression is mostly true or mostly false. note that these return */
421 /* booleans, not the expression. */
422 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
423 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
424 /* for compatibility to the rest of the world */
425 #define ecb_likely(expr) ecb_expect_true (expr)
426 #define ecb_unlikely(expr) ecb_expect_false (expr)
427
428 /* count trailing zero bits and count # of one bits */
429 #if ECB_GCC_VERSION(3,4) \
430 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
431 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
432 && ECB_CLANG_BUILTIN(__builtin_popcount))
433 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
434 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
435 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
436 #define ecb_ctz32(x) __builtin_ctz (x)
437 #define ecb_ctz64(x) __builtin_ctzll (x)
438 #define ecb_popcount32(x) __builtin_popcount (x)
439 /* no popcountll */
440 #else
441 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
442 ecb_function_ ecb_const int
443 ecb_ctz32 (uint32_t x)
444 {
445 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
446 unsigned long r;
447 _BitScanForward (&r, x);
448 return (int)r;
449 #else
450 int r = 0;
451
452 x &= ~x + 1; /* this isolates the lowest bit */
453
454 #if ECB_branchless_on_i386
455 r += !!(x & 0xaaaaaaaa) << 0;
456 r += !!(x & 0xcccccccc) << 1;
457 r += !!(x & 0xf0f0f0f0) << 2;
458 r += !!(x & 0xff00ff00) << 3;
459 r += !!(x & 0xffff0000) << 4;
460 #else
461 if (x & 0xaaaaaaaa) r += 1;
462 if (x & 0xcccccccc) r += 2;
463 if (x & 0xf0f0f0f0) r += 4;
464 if (x & 0xff00ff00) r += 8;
465 if (x & 0xffff0000) r += 16;
466 #endif
467
468 return r;
469 #endif
470 }
471
472 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
473 ecb_function_ ecb_const int
474 ecb_ctz64 (uint64_t x)
475 {
476 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
477 unsigned long r;
478 _BitScanForward64 (&r, x);
479 return (int)r;
480 #else
481 int shift = x & 0xffffffff ? 0 : 32;
482 return ecb_ctz32 (x >> shift) + shift;
483 #endif
484 }
485
486 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
487 ecb_function_ ecb_const int
488 ecb_popcount32 (uint32_t x)
489 {
490 x -= (x >> 1) & 0x55555555;
491 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
492 x = ((x >> 4) + x) & 0x0f0f0f0f;
493 x *= 0x01010101;
494
495 return x >> 24;
496 }
497
498 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
499 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
500 {
501 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
502 unsigned long r;
503 _BitScanReverse (&r, x);
504 return (int)r;
505 #else
506 int r = 0;
507
508 if (x >> 16) { x >>= 16; r += 16; }
509 if (x >> 8) { x >>= 8; r += 8; }
510 if (x >> 4) { x >>= 4; r += 4; }
511 if (x >> 2) { x >>= 2; r += 2; }
512 if (x >> 1) { r += 1; }
513
514 return r;
515 #endif
516 }
517
518 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
519 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
520 {
521 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
522 unsigned long r;
523 _BitScanReverse64 (&r, x);
524 return (int)r;
525 #else
526 int r = 0;
527
528 if (x >> 32) { x >>= 32; r += 32; }
529
530 return r + ecb_ld32 (x);
531 #endif
532 }
533 #endif
534
535 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
536 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
537 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
538 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
539
540 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
541 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
542 {
543 return ( (x * 0x0802U & 0x22110U)
544 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
545 }
546
547 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
548 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
549 {
550 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
551 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
552 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
553 x = ( x >> 8 ) | ( x << 8);
554
555 return x;
556 }
557
558 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
559 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
560 {
561 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
562 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
563 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
564 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
565 x = ( x >> 16 ) | ( x << 16);
566
567 return x;
568 }
569
570 /* popcount64 is only available on 64 bit cpus as gcc builtin */
571 /* so for this version we are lazy */
572 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
573 ecb_function_ ecb_const int
574 ecb_popcount64 (uint64_t x)
575 {
576 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
577 }
578
579 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
580 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
581 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
582 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
583 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
584 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
585 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
586 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
587
588 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
589 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
590 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
591 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
592 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
593 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
594 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
595 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
596
597 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
598 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
599 #define ecb_bswap16(x) __builtin_bswap16 (x)
600 #else
601 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
602 #endif
603 #define ecb_bswap32(x) __builtin_bswap32 (x)
604 #define ecb_bswap64(x) __builtin_bswap64 (x)
605 #elif _MSC_VER
606 #include <stdlib.h>
607 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
608 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
609 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
610 #else
611 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
612 ecb_function_ ecb_const uint16_t
613 ecb_bswap16 (uint16_t x)
614 {
615 return ecb_rotl16 (x, 8);
616 }
617
618 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
619 ecb_function_ ecb_const uint32_t
620 ecb_bswap32 (uint32_t x)
621 {
622 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
623 }
624
625 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
626 ecb_function_ ecb_const uint64_t
627 ecb_bswap64 (uint64_t x)
628 {
629 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
630 }
631 #endif
632
633 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
634 #define ecb_unreachable() __builtin_unreachable ()
635 #else
636 /* this seems to work fine, but gcc always emits a warning for it :/ */
637 ecb_inline ecb_noreturn void ecb_unreachable (void);
638 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
639 #endif
640
641 /* try to tell the compiler that some condition is definitely true */
642 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
643
644 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
645 ecb_inline ecb_const uint32_t
646 ecb_byteorder_helper (void)
647 {
648 /* the union code still generates code under pressure in gcc, */
649 /* but less than using pointers, and always seems to */
650 /* successfully return a constant. */
651 /* the reason why we have this horrible preprocessor mess */
652 /* is to avoid it in all cases, at least on common architectures */
653 /* or when using a recent enough gcc version (>= 4.6) */
654 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
655 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
656 #define ECB_LITTLE_ENDIAN 1
657 return 0x44332211;
658 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
659 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
660 #define ECB_BIG_ENDIAN 1
661 return 0x11223344;
662 #else
663 union
664 {
665 uint8_t c[4];
666 uint32_t u;
667 } u = { 0x11, 0x22, 0x33, 0x44 };
668 return u.u;
669 #endif
670 }
671
672 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
673 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
674 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
675 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
676
677 #if ECB_GCC_VERSION(3,0) || ECB_C99
678 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
679 #else
680 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
681 #endif
682
683 #if ECB_CPP
684 template<typename T>
685 static inline T ecb_div_rd (T val, T div)
686 {
687 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
688 }
689 template<typename T>
690 static inline T ecb_div_ru (T val, T div)
691 {
692 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
693 }
694 #else
695 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
696 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
697 #endif
698
699 #if ecb_cplusplus_does_not_suck
700 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
701 template<typename T, int N>
702 static inline int ecb_array_length (const T (&arr)[N])
703 {
704 return N;
705 }
706 #else
707 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
708 #endif
709
710 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
711 ecb_function_ ecb_const uint32_t
712 ecb_binary16_to_binary32 (uint32_t x)
713 {
714 unsigned int s = (x & 0x8000) << (31 - 15);
715 int e = (x >> 10) & 0x001f;
716 unsigned int m = x & 0x03ff;
717
718 if (ecb_expect_false (e == 31))
719 /* infinity or NaN */
720 e = 255 - (127 - 15);
721 else if (ecb_expect_false (!e))
722 {
723 if (ecb_expect_true (!m))
724 /* zero, handled by code below by forcing e to 0 */
725 e = 0 - (127 - 15);
726 else
727 {
728 /* subnormal, renormalise */
729 unsigned int s = 10 - ecb_ld32 (m);
730
731 m = (m << s) & 0x3ff; /* mask implicit bit */
732 e -= s - 1;
733 }
734 }
735
736 /* e and m now are normalised, or zero, (or inf or nan) */
737 e += 127 - 15;
738
739 return s | (e << 23) | (m << (23 - 10));
740 }
741
742 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
743 ecb_function_ ecb_const uint16_t
744 ecb_binary32_to_binary16 (uint32_t x)
745 {
746 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
747 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
748 unsigned int m = x & 0x007fffff;
749
750 x &= 0x7fffffff;
751
752 /* if it's within range of binary16 normals, use fast path */
753 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
754 {
755 /* mantissa round-to-even */
756 m += 0x00000fff + ((m >> (23 - 10)) & 1);
757
758 /* handle overflow */
759 if (ecb_expect_false (m >= 0x00800000))
760 {
761 m >>= 1;
762 e += 1;
763 }
764
765 return s | (e << 10) | (m >> (23 - 10));
766 }
767
768 /* handle large numbers and infinity */
769 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
770 return s | 0x7c00;
771
772 /* handle zero, subnormals and small numbers */
773 if (ecb_expect_true (x < 0x38800000))
774 {
775 /* zero */
776 if (ecb_expect_true (!x))
777 return s;
778
779 /* handle subnormals */
780
781 /* too small, will be zero */
782 if (e < (14 - 24)) /* might not be sharp, but is good enough */
783 return s;
784
785 m |= 0x00800000; /* make implicit bit explicit */
786
787 /* very tricky - we need to round to the nearest e (+10) bit value */
788 {
789 unsigned int bits = 14 - e;
790 unsigned int half = (1 << (bits - 1)) - 1;
791 unsigned int even = (m >> bits) & 1;
792
793 /* if this overflows, we will end up with a normalised number */
794 m = (m + half + even) >> bits;
795 }
796
797 return s | m;
798 }
799
800 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
801 m >>= 13;
802
803 return s | 0x7c00 | m | !m;
804 }
805
806 /*******************************************************************************/
807 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
808
809 /* basically, everything uses "ieee pure-endian" floating point numbers */
810 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
811 #if 0 \
812 || __i386 || __i386__ \
813 || ECB_GCC_AMD64 \
814 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
815 || defined __s390__ || defined __s390x__ \
816 || defined __mips__ \
817 || defined __alpha__ \
818 || defined __hppa__ \
819 || defined __ia64__ \
820 || defined __m68k__ \
821 || defined __m88k__ \
822 || defined __sh__ \
823 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
824 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
825 || defined __aarch64__
826 #define ECB_STDFP 1
827 #include <string.h> /* for memcpy */
828 #else
829 #define ECB_STDFP 0
830 #endif
831
832 #ifndef ECB_NO_LIBM
833
834 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
835
836 /* only the oldest of old doesn't have this one. solaris. */
837 #ifdef INFINITY
838 #define ECB_INFINITY INFINITY
839 #else
840 #define ECB_INFINITY HUGE_VAL
841 #endif
842
843 #ifdef NAN
844 #define ECB_NAN NAN
845 #else
846 #define ECB_NAN ECB_INFINITY
847 #endif
848
849 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
850 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
851 #define ecb_frexpf(x,e) frexpf ((x), (e))
852 #else
853 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
854 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
855 #endif
856
857 /* convert a float to ieee single/binary32 */
858 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
859 ecb_function_ ecb_const uint32_t
860 ecb_float_to_binary32 (float x)
861 {
862 uint32_t r;
863
864 #if ECB_STDFP
865 memcpy (&r, &x, 4);
866 #else
867 /* slow emulation, works for anything but -0 */
868 uint32_t m;
869 int e;
870
871 if (x == 0e0f ) return 0x00000000U;
872 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
873 if (x < -3.40282346638528860e+38f) return 0xff800000U;
874 if (x != x ) return 0x7fbfffffU;
875
876 m = ecb_frexpf (x, &e) * 0x1000000U;
877
878 r = m & 0x80000000U;
879
880 if (r)
881 m = -m;
882
883 if (e <= -126)
884 {
885 m &= 0xffffffU;
886 m >>= (-125 - e);
887 e = -126;
888 }
889
890 r |= (e + 126) << 23;
891 r |= m & 0x7fffffU;
892 #endif
893
894 return r;
895 }
896
897 /* converts an ieee single/binary32 to a float */
898 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
899 ecb_function_ ecb_const float
900 ecb_binary32_to_float (uint32_t x)
901 {
902 float r;
903
904 #if ECB_STDFP
905 memcpy (&r, &x, 4);
906 #else
907 /* emulation, only works for normals and subnormals and +0 */
908 int neg = x >> 31;
909 int e = (x >> 23) & 0xffU;
910
911 x &= 0x7fffffU;
912
913 if (e)
914 x |= 0x800000U;
915 else
916 e = 1;
917
918 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
919 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
920
921 r = neg ? -r : r;
922 #endif
923
924 return r;
925 }
926
927 /* convert a double to ieee double/binary64 */
928 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
929 ecb_function_ ecb_const uint64_t
930 ecb_double_to_binary64 (double x)
931 {
932 uint64_t r;
933
934 #if ECB_STDFP
935 memcpy (&r, &x, 8);
936 #else
937 /* slow emulation, works for anything but -0 */
938 uint64_t m;
939 int e;
940
941 if (x == 0e0 ) return 0x0000000000000000U;
942 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
943 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
944 if (x != x ) return 0X7ff7ffffffffffffU;
945
946 m = frexp (x, &e) * 0x20000000000000U;
947
948 r = m & 0x8000000000000000;;
949
950 if (r)
951 m = -m;
952
953 if (e <= -1022)
954 {
955 m &= 0x1fffffffffffffU;
956 m >>= (-1021 - e);
957 e = -1022;
958 }
959
960 r |= ((uint64_t)(e + 1022)) << 52;
961 r |= m & 0xfffffffffffffU;
962 #endif
963
964 return r;
965 }
966
967 /* converts an ieee double/binary64 to a double */
968 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
969 ecb_function_ ecb_const double
970 ecb_binary64_to_double (uint64_t x)
971 {
972 double r;
973
974 #if ECB_STDFP
975 memcpy (&r, &x, 8);
976 #else
977 /* emulation, only works for normals and subnormals and +0 */
978 int neg = x >> 63;
979 int e = (x >> 52) & 0x7ffU;
980
981 x &= 0xfffffffffffffU;
982
983 if (e)
984 x |= 0x10000000000000U;
985 else
986 e = 1;
987
988 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
989 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
990
991 r = neg ? -r : r;
992 #endif
993
994 return r;
995 }
996
997 /* convert a float to ieee half/binary16 */
998 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
999 ecb_function_ ecb_const uint16_t
1000 ecb_float_to_binary16 (float x)
1001 {
1002 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1003 }
1004
1005 /* convert an ieee half/binary16 to float */
1006 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1007 ecb_function_ ecb_const float
1008 ecb_binary16_to_float (uint16_t x)
1009 {
1010 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1011 }
1012
1013 #endif
1014
1015 #endif
1016