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Revision: 1.189
Committed: Mon Jun 21 21:26:48 2021 UTC (2 years, 11 months ago) by root
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2015,2018-2021 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 0x00010009
46
47 #include <string.h> /* for memcpy */
48
49 #if defined (_WIN32) && !defined (__MINGW32__)
50 typedef signed char int8_t;
51 typedef unsigned char uint8_t;
52 typedef signed char int_fast8_t;
53 typedef unsigned char uint_fast8_t;
54 typedef signed short int16_t;
55 typedef unsigned short uint16_t;
56 typedef signed int int_fast16_t;
57 typedef unsigned int uint_fast16_t;
58 typedef signed int int32_t;
59 typedef unsigned int uint32_t;
60 typedef signed int int_fast32_t;
61 typedef unsigned int uint_fast32_t;
62 #if __GNUC__
63 typedef signed long long int64_t;
64 typedef unsigned long long uint64_t;
65 #else /* _MSC_VER || __BORLANDC__ */
66 typedef signed __int64 int64_t;
67 typedef unsigned __int64 uint64_t;
68 #endif
69 typedef int64_t int_fast64_t;
70 typedef uint64_t uint_fast64_t;
71 #ifdef _WIN64
72 #define ECB_PTRSIZE 8
73 typedef uint64_t uintptr_t;
74 typedef int64_t intptr_t;
75 #else
76 #define ECB_PTRSIZE 4
77 typedef uint32_t uintptr_t;
78 typedef int32_t intptr_t;
79 #endif
80 #else
81 #include <inttypes.h>
82 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
83 #define ECB_PTRSIZE 8
84 #else
85 #define ECB_PTRSIZE 4
86 #endif
87 #endif
88
89 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
90 #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
91
92 #ifndef ECB_OPTIMIZE_SIZE
93 #if __OPTIMIZE_SIZE__
94 #define ECB_OPTIMIZE_SIZE 1
95 #else
96 #define ECB_OPTIMIZE_SIZE 0
97 #endif
98 #endif
99
100 /* work around x32 idiocy by defining proper macros */
101 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
102 #if _ILP32
103 #define ECB_AMD64_X32 1
104 #else
105 #define ECB_AMD64 1
106 #endif
107 #endif
108
109 #if ECB_PTRSIZE >= 8 || ECB_AMD64_X32
110 #define ECB_64BIT_NATIVE 1
111 #else
112 #define ECB_64BIT_NATIVE 0
113 #endif
114
115 /* many compilers define _GNUC_ to some versions but then only implement
116 * what their idiot authors think are the "more important" extensions,
117 * causing enormous grief in return for some better fake benchmark numbers.
118 * or so.
119 * we try to detect these and simply assume they are not gcc - if they have
120 * an issue with that they should have done it right in the first place.
121 */
122 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
123 #define ECB_GCC_VERSION(major,minor) 0
124 #else
125 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
126 #endif
127
128 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
129
130 #if __clang__ && defined __has_builtin
131 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
132 #else
133 #define ECB_CLANG_BUILTIN(x) 0
134 #endif
135
136 #if __clang__ && defined __has_extension
137 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
138 #else
139 #define ECB_CLANG_EXTENSION(x) 0
140 #endif
141
142 #define ECB_CPP (__cplusplus+0)
143 #define ECB_CPP11 (__cplusplus >= 201103L)
144 #define ECB_CPP14 (__cplusplus >= 201402L)
145 #define ECB_CPP17 (__cplusplus >= 201703L)
146
147 #if ECB_CPP
148 #define ECB_C 0
149 #define ECB_STDC_VERSION 0
150 #else
151 #define ECB_C 1
152 #define ECB_STDC_VERSION __STDC_VERSION__
153 #endif
154
155 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
156 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
157 #define ECB_C17 (ECB_STDC_VERSION >= 201710L)
158
159 #if ECB_CPP
160 #define ECB_EXTERN_C extern "C"
161 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
162 #define ECB_EXTERN_C_END }
163 #else
164 #define ECB_EXTERN_C extern
165 #define ECB_EXTERN_C_BEG
166 #define ECB_EXTERN_C_END
167 #endif
168
169 /*****************************************************************************/
170
171 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
172 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
173
174 #if ECB_NO_THREADS
175 #define ECB_NO_SMP 1
176 #endif
177
178 #if ECB_NO_SMP
179 #define ECB_MEMORY_FENCE do { } while (0)
180 #endif
181
182 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
183 #if __xlC__ && ECB_CPP
184 #include <builtins.h>
185 #endif
186
187 #if 1400 <= _MSC_VER
188 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
189 #endif
190
191 #ifndef ECB_MEMORY_FENCE
192 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
193 #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
194 #if __i386 || __i386__
195 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
196 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
197 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
198 #elif ECB_GCC_AMD64
199 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
200 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
201 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
202 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
203 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
204 #elif defined __ARM_ARCH_2__ \
205 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
206 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
207 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
208 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
209 || defined __ARM_ARCH_5TEJ__
210 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
211 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
212 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
213 || defined __ARM_ARCH_6T2__
214 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
215 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
216 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
217 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
218 #elif __aarch64__
219 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
220 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
221 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
222 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
223 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
224 #elif defined __s390__ || defined __s390x__
225 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
226 #elif defined __mips__
227 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
228 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
229 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
230 #elif defined __alpha__
231 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
232 #elif defined __hppa__
233 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
234 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
235 #elif defined __ia64__
236 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
237 #elif defined __m68k__
238 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
239 #elif defined __m88k__
240 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
241 #elif defined __sh__
242 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
243 #endif
244 #endif
245 #endif
246
247 #ifndef ECB_MEMORY_FENCE
248 #if ECB_GCC_VERSION(4,7)
249 /* see comment below (stdatomic.h) about the C11 memory model. */
250 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
251 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
252 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
253 #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
254
255 #elif ECB_CLANG_EXTENSION(c_atomic)
256 /* see comment below (stdatomic.h) about the C11 memory model. */
257 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
258 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
259 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
260 #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
261
262 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
263 #define ECB_MEMORY_FENCE __sync_synchronize ()
264 #elif _MSC_VER >= 1500 /* VC++ 2008 */
265 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
266 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
267 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
268 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
269 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
270 #elif _MSC_VER >= 1400 /* VC++ 2005 */
271 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
272 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
273 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
274 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
275 #elif defined _WIN32
276 #include <WinNT.h>
277 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
278 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
279 #include <mbarrier.h>
280 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
281 #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
282 #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
283 #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
284 #elif __xlC__
285 #define ECB_MEMORY_FENCE __sync ()
286 #endif
287 #endif
288
289 #ifndef ECB_MEMORY_FENCE
290 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
291 /* we assume that these memory fences work on all variables/all memory accesses, */
292 /* not just C11 atomics and atomic accesses */
293 #include <stdatomic.h>
294 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
295 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
296 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
297 #endif
298 #endif
299
300 #ifndef ECB_MEMORY_FENCE
301 #if !ECB_AVOID_PTHREADS
302 /*
303 * if you get undefined symbol references to pthread_mutex_lock,
304 * or failure to find pthread.h, then you should implement
305 * the ECB_MEMORY_FENCE operations for your cpu/compiler
306 * OR provide pthread.h and link against the posix thread library
307 * of your system.
308 */
309 #include <pthread.h>
310 #define ECB_NEEDS_PTHREADS 1
311 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
312
313 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
314 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
315 #endif
316 #endif
317
318 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
319 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
320 #endif
321
322 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
323 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
324 #endif
325
326 #if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
327 #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
328 #endif
329
330 /*****************************************************************************/
331
332 #if ECB_CPP
333 #define ecb_inline static inline
334 #elif ECB_GCC_VERSION(2,5)
335 #define ecb_inline static __inline__
336 #elif ECB_C99
337 #define ecb_inline static inline
338 #else
339 #define ecb_inline static
340 #endif
341
342 #if ECB_GCC_VERSION(3,3)
343 #define ecb_restrict __restrict__
344 #elif ECB_C99
345 #define ecb_restrict restrict
346 #else
347 #define ecb_restrict
348 #endif
349
350 typedef int ecb_bool;
351
352 #define ECB_CONCAT_(a, b) a ## b
353 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
354 #define ECB_STRINGIFY_(a) # a
355 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
356 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
357
358 #define ecb_function_ ecb_inline
359
360 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
361 #define ecb_attribute(attrlist) __attribute__ (attrlist)
362 #else
363 #define ecb_attribute(attrlist)
364 #endif
365
366 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
367 #define ecb_is_constant(expr) __builtin_constant_p (expr)
368 #else
369 /* possible C11 impl for integral types
370 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
371 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
372
373 #define ecb_is_constant(expr) 0
374 #endif
375
376 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
377 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
378 #else
379 #define ecb_expect(expr,value) (expr)
380 #endif
381
382 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
383 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
384 #else
385 #define ecb_prefetch(addr,rw,locality)
386 #endif
387
388 /* no emulation for ecb_decltype */
389 #if ECB_CPP11
390 // older implementations might have problems with decltype(x)::type, work around it
391 template<class T> struct ecb_decltype_t { typedef T type; };
392 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
393 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
394 #define ecb_decltype(x) __typeof__ (x)
395 #endif
396
397 #if _MSC_VER >= 1300
398 #define ecb_deprecated __declspec (deprecated)
399 #else
400 #define ecb_deprecated ecb_attribute ((__deprecated__))
401 #endif
402
403 #if _MSC_VER >= 1500
404 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
405 #elif ECB_GCC_VERSION(4,5)
406 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
407 #else
408 #define ecb_deprecated_message(msg) ecb_deprecated
409 #endif
410
411 #if _MSC_VER >= 1400
412 #define ecb_noinline __declspec (noinline)
413 #else
414 #define ecb_noinline ecb_attribute ((__noinline__))
415 #endif
416
417 #define ecb_unused ecb_attribute ((__unused__))
418 #define ecb_const ecb_attribute ((__const__))
419 #define ecb_pure ecb_attribute ((__pure__))
420
421 #if ECB_C11 || __IBMC_NORETURN
422 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
423 #define ecb_noreturn _Noreturn
424 #elif ECB_CPP11
425 #define ecb_noreturn [[noreturn]]
426 #elif _MSC_VER >= 1200
427 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
428 #define ecb_noreturn __declspec (noreturn)
429 #else
430 #define ecb_noreturn ecb_attribute ((__noreturn__))
431 #endif
432
433 #if ECB_GCC_VERSION(4,3)
434 #define ecb_artificial ecb_attribute ((__artificial__))
435 #define ecb_hot ecb_attribute ((__hot__))
436 #define ecb_cold ecb_attribute ((__cold__))
437 #else
438 #define ecb_artificial
439 #define ecb_hot
440 #define ecb_cold
441 #endif
442
443 /* put around conditional expressions if you are very sure that the */
444 /* expression is mostly true or mostly false. note that these return */
445 /* booleans, not the expression. */
446 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
447 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
448 /* for compatibility to the rest of the world */
449 #define ecb_likely(expr) ecb_expect_true (expr)
450 #define ecb_unlikely(expr) ecb_expect_false (expr)
451
452 /* count trailing zero bits and count # of one bits */
453 #if ECB_GCC_VERSION(3,4) \
454 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
455 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
456 && ECB_CLANG_BUILTIN(__builtin_popcount))
457 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
458 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
459 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
460 #define ecb_ctz32(x) __builtin_ctz (x)
461 #define ecb_ctz64(x) __builtin_ctzll (x)
462 #define ecb_popcount32(x) __builtin_popcount (x)
463 /* no popcountll */
464 #else
465 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
466 ecb_function_ ecb_const int
467 ecb_ctz32 (uint32_t x)
468 {
469 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
470 unsigned long r;
471 _BitScanForward (&r, x);
472 return (int)r;
473 #else
474 int r = 0;
475
476 x &= ~x + 1; /* this isolates the lowest bit */
477
478 #if ECB_branchless_on_i386
479 r += !!(x & 0xaaaaaaaa) << 0;
480 r += !!(x & 0xcccccccc) << 1;
481 r += !!(x & 0xf0f0f0f0) << 2;
482 r += !!(x & 0xff00ff00) << 3;
483 r += !!(x & 0xffff0000) << 4;
484 #else
485 if (x & 0xaaaaaaaa) r += 1;
486 if (x & 0xcccccccc) r += 2;
487 if (x & 0xf0f0f0f0) r += 4;
488 if (x & 0xff00ff00) r += 8;
489 if (x & 0xffff0000) r += 16;
490 #endif
491
492 return r;
493 #endif
494 }
495
496 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
497 ecb_function_ ecb_const int
498 ecb_ctz64 (uint64_t x)
499 {
500 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
501 unsigned long r;
502 _BitScanForward64 (&r, x);
503 return (int)r;
504 #else
505 int shift = x & 0xffffffff ? 0 : 32;
506 return ecb_ctz32 (x >> shift) + shift;
507 #endif
508 }
509
510 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
511 ecb_function_ ecb_const int
512 ecb_popcount32 (uint32_t x)
513 {
514 x -= (x >> 1) & 0x55555555;
515 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
516 x = ((x >> 4) + x) & 0x0f0f0f0f;
517 x *= 0x01010101;
518
519 return x >> 24;
520 }
521
522 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
523 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
524 {
525 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
526 unsigned long r;
527 _BitScanReverse (&r, x);
528 return (int)r;
529 #else
530 int r = 0;
531
532 if (x >> 16) { x >>= 16; r += 16; }
533 if (x >> 8) { x >>= 8; r += 8; }
534 if (x >> 4) { x >>= 4; r += 4; }
535 if (x >> 2) { x >>= 2; r += 2; }
536 if (x >> 1) { r += 1; }
537
538 return r;
539 #endif
540 }
541
542 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
543 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
544 {
545 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
546 unsigned long r;
547 _BitScanReverse64 (&r, x);
548 return (int)r;
549 #else
550 int r = 0;
551
552 if (x >> 32) { x >>= 32; r += 32; }
553
554 return r + ecb_ld32 (x);
555 #endif
556 }
557 #endif
558
559 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
560 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
561 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
562 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
563
564 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
565 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
566 {
567 return ( (x * 0x0802U & 0x22110U)
568 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
569 }
570
571 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
572 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
573 {
574 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
575 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
576 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
577 x = ( x >> 8 ) | ( x << 8);
578
579 return x;
580 }
581
582 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
583 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
584 {
585 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
586 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
587 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
588 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
589 x = ( x >> 16 ) | ( x << 16);
590
591 return x;
592 }
593
594 /* popcount64 is only available on 64 bit cpus as gcc builtin */
595 /* so for this version we are lazy */
596 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
597 ecb_function_ ecb_const int
598 ecb_popcount64 (uint64_t x)
599 {
600 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
601 }
602
603 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
604 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
605 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
606 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
607 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
608 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
609 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
610 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
611
612 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
613 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
614 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
615 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
616 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
617 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
618 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
619 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
620
621 #if ECB_CPP
622
623 inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
624 inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
625 inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
626 inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
627
628 inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
629 inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
630 inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
631 inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
632
633 inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
634 inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
635 inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
636 inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
637
638 inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
639 inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
640 inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
641 inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
642
643 inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
644 inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
645 inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
646
647 inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
648 inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
649 inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
650 inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
651
652 inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
653 inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
654 inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
655 inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
656
657 #endif
658
659 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
660 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
661 #define ecb_bswap16(x) __builtin_bswap16 (x)
662 #else
663 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
664 #endif
665 #define ecb_bswap32(x) __builtin_bswap32 (x)
666 #define ecb_bswap64(x) __builtin_bswap64 (x)
667 #elif _MSC_VER
668 #include <stdlib.h>
669 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
670 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
671 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
672 #else
673 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
674 ecb_function_ ecb_const uint16_t
675 ecb_bswap16 (uint16_t x)
676 {
677 return ecb_rotl16 (x, 8);
678 }
679
680 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
681 ecb_function_ ecb_const uint32_t
682 ecb_bswap32 (uint32_t x)
683 {
684 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
685 }
686
687 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
688 ecb_function_ ecb_const uint64_t
689 ecb_bswap64 (uint64_t x)
690 {
691 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
692 }
693 #endif
694
695 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
696 #define ecb_unreachable() __builtin_unreachable ()
697 #else
698 /* this seems to work fine, but gcc always emits a warning for it :/ */
699 ecb_inline ecb_noreturn void ecb_unreachable (void);
700 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
701 #endif
702
703 /* try to tell the compiler that some condition is definitely true */
704 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
705
706 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
707 ecb_inline ecb_const uint32_t
708 ecb_byteorder_helper (void)
709 {
710 /* the union code still generates code under pressure in gcc, */
711 /* but less than using pointers, and always seems to */
712 /* successfully return a constant. */
713 /* the reason why we have this horrible preprocessor mess */
714 /* is to avoid it in all cases, at least on common architectures */
715 /* or when using a recent enough gcc version (>= 4.6) */
716 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
717 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
718 #define ECB_LITTLE_ENDIAN 1
719 return 0x44332211;
720 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
721 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
722 #define ECB_BIG_ENDIAN 1
723 return 0x11223344;
724 #else
725 union
726 {
727 uint8_t c[4];
728 uint32_t u;
729 } u = { 0x11, 0x22, 0x33, 0x44 };
730 return u.u;
731 #endif
732 }
733
734 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
735 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
736 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
737 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
738
739 /*****************************************************************************/
740 /* unaligned load/store */
741
742 ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
743 ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
744 ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
745
746 ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
747 ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
748 ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
749
750 ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
751 ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
752 ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
753
754 ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
755 ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
756 ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
757
758 ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
759 ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
760 ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
761
762 ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
763 ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
764 ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
765
766 ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
767 ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
768 ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
769
770 ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
771 ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
772 ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
773
774 ecb_inline void ecb_poke_be_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_be_u16 (v)); }
775 ecb_inline void ecb_poke_be_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_be_u32 (v)); }
776 ecb_inline void ecb_poke_be_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_be_u64 (v)); }
777
778 ecb_inline void ecb_poke_le_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_le_u16 (v)); }
779 ecb_inline void ecb_poke_le_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_le_u32 (v)); }
780 ecb_inline void ecb_poke_le_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_le_u64 (v)); }
781
782 #if ECB_CPP
783
784 inline uint8_t ecb_bswap (uint8_t v) { return v; }
785 inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
786 inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
787 inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
788
789 template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
790 template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
791 template<typename T> inline T ecb_peek (const void *ptr) { return *(const T *)ptr; }
792 template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
793 template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
794 template<typename T> inline T ecb_peek_u (const void *ptr) { T v; memcpy (&v, ptr, sizeof (v)); return v; }
795 template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
796 template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
797
798 template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
799 template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
800 template<typename T> inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; }
801 template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
802 template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
803 template<typename T> inline void ecb_poke_u (void *ptr, T v) { memcpy (ptr, &v, sizeof (v)); }
804 template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
805 template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
806
807 #endif
808
809 /*****************************************************************************/
810 /* division */
811
812 #if ECB_GCC_VERSION(3,0) || ECB_C99
813 /* C99 tightened the definition of %, so we can use a more efficient version */
814 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
815 #else
816 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
817 #endif
818
819 #if ECB_CPP
820 template<typename T>
821 static inline T ecb_div_rd (T val, T div)
822 {
823 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
824 }
825 template<typename T>
826 static inline T ecb_div_ru (T val, T div)
827 {
828 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
829 }
830 #else
831 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
832 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
833 #endif
834
835 /*****************************************************************************/
836 /* array length */
837
838 #if ecb_cplusplus_does_not_suck
839 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
840 template<typename T, int N>
841 static inline int ecb_array_length (const T (&arr)[N])
842 {
843 return N;
844 }
845 #else
846 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
847 #endif
848
849 /*****************************************************************************/
850 /* IEEE 754-2008 half float conversions */
851
852 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
853 ecb_function_ ecb_const uint32_t
854 ecb_binary16_to_binary32 (uint32_t x)
855 {
856 unsigned int s = (x & 0x8000) << (31 - 15);
857 int e = (x >> 10) & 0x001f;
858 unsigned int m = x & 0x03ff;
859
860 if (ecb_expect_false (e == 31))
861 /* infinity or NaN */
862 e = 255 - (127 - 15);
863 else if (ecb_expect_false (!e))
864 {
865 if (ecb_expect_true (!m))
866 /* zero, handled by code below by forcing e to 0 */
867 e = 0 - (127 - 15);
868 else
869 {
870 /* subnormal, renormalise */
871 unsigned int s = 10 - ecb_ld32 (m);
872
873 m = (m << s) & 0x3ff; /* mask implicit bit */
874 e -= s - 1;
875 }
876 }
877
878 /* e and m now are normalised, or zero, (or inf or nan) */
879 e += 127 - 15;
880
881 return s | (e << 23) | (m << (23 - 10));
882 }
883
884 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
885 ecb_function_ ecb_const uint16_t
886 ecb_binary32_to_binary16 (uint32_t x)
887 {
888 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
889 int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
890 unsigned int m = x & 0x007fffff;
891
892 x &= 0x7fffffff;
893
894 /* if it's within range of binary16 normals, use fast path */
895 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
896 {
897 /* mantissa round-to-even */
898 m += 0x00000fff + ((m >> (23 - 10)) & 1);
899
900 /* handle overflow */
901 if (ecb_expect_false (m >= 0x00800000))
902 {
903 m >>= 1;
904 e += 1;
905 }
906
907 return s | (e << 10) | (m >> (23 - 10));
908 }
909
910 /* handle large numbers and infinity */
911 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
912 return s | 0x7c00;
913
914 /* handle zero, subnormals and small numbers */
915 if (ecb_expect_true (x < 0x38800000))
916 {
917 /* zero */
918 if (ecb_expect_true (!x))
919 return s;
920
921 /* handle subnormals */
922
923 /* too small, will be zero */
924 if (e < (14 - 24)) /* might not be sharp, but is good enough */
925 return s;
926
927 m |= 0x00800000; /* make implicit bit explicit */
928
929 /* very tricky - we need to round to the nearest e (+10) bit value */
930 {
931 unsigned int bits = 14 - e;
932 unsigned int half = (1 << (bits - 1)) - 1;
933 unsigned int even = (m >> bits) & 1;
934
935 /* if this overflows, we will end up with a normalised number */
936 m = (m + half + even) >> bits;
937 }
938
939 return s | m;
940 }
941
942 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
943 m >>= 13;
944
945 return s | 0x7c00 | m | !m;
946 }
947
948 /*******************************************************************************/
949 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
950
951 /* basically, everything uses "ieee pure-endian" floating point numbers */
952 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
953 #if 0 \
954 || __i386 || __i386__ \
955 || ECB_GCC_AMD64 \
956 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
957 || defined __s390__ || defined __s390x__ \
958 || defined __mips__ \
959 || defined __alpha__ \
960 || defined __hppa__ \
961 || defined __ia64__ \
962 || defined __m68k__ \
963 || defined __m88k__ \
964 || defined __sh__ \
965 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
966 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
967 || defined __aarch64__
968 #define ECB_STDFP 1
969 #else
970 #define ECB_STDFP 0
971 #endif
972
973 #ifndef ECB_NO_LIBM
974
975 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
976
977 /* only the oldest of old doesn't have this one. solaris. */
978 #ifdef INFINITY
979 #define ECB_INFINITY INFINITY
980 #else
981 #define ECB_INFINITY HUGE_VAL
982 #endif
983
984 #ifdef NAN
985 #define ECB_NAN NAN
986 #else
987 #define ECB_NAN ECB_INFINITY
988 #endif
989
990 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
991 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
992 #define ecb_frexpf(x,e) frexpf ((x), (e))
993 #else
994 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
995 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
996 #endif
997
998 /* convert a float to ieee single/binary32 */
999 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
1000 ecb_function_ ecb_const uint32_t
1001 ecb_float_to_binary32 (float x)
1002 {
1003 uint32_t r;
1004
1005 #if ECB_STDFP
1006 memcpy (&r, &x, 4);
1007 #else
1008 /* slow emulation, works for anything but -0 */
1009 uint32_t m;
1010 int e;
1011
1012 if (x == 0e0f ) return 0x00000000U;
1013 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1014 if (x < -3.40282346638528860e+38f) return 0xff800000U;
1015 if (x != x ) return 0x7fbfffffU;
1016
1017 m = ecb_frexpf (x, &e) * 0x1000000U;
1018
1019 r = m & 0x80000000U;
1020
1021 if (r)
1022 m = -m;
1023
1024 if (e <= -126)
1025 {
1026 m &= 0xffffffU;
1027 m >>= (-125 - e);
1028 e = -126;
1029 }
1030
1031 r |= (e + 126) << 23;
1032 r |= m & 0x7fffffU;
1033 #endif
1034
1035 return r;
1036 }
1037
1038 /* converts an ieee single/binary32 to a float */
1039 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1040 ecb_function_ ecb_const float
1041 ecb_binary32_to_float (uint32_t x)
1042 {
1043 float r;
1044
1045 #if ECB_STDFP
1046 memcpy (&r, &x, 4);
1047 #else
1048 /* emulation, only works for normals and subnormals and +0 */
1049 int neg = x >> 31;
1050 int e = (x >> 23) & 0xffU;
1051
1052 x &= 0x7fffffU;
1053
1054 if (e)
1055 x |= 0x800000U;
1056 else
1057 e = 1;
1058
1059 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1060 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1061
1062 r = neg ? -r : r;
1063 #endif
1064
1065 return r;
1066 }
1067
1068 /* convert a double to ieee double/binary64 */
1069 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1070 ecb_function_ ecb_const uint64_t
1071 ecb_double_to_binary64 (double x)
1072 {
1073 uint64_t r;
1074
1075 #if ECB_STDFP
1076 memcpy (&r, &x, 8);
1077 #else
1078 /* slow emulation, works for anything but -0 */
1079 uint64_t m;
1080 int e;
1081
1082 if (x == 0e0 ) return 0x0000000000000000U;
1083 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1084 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1085 if (x != x ) return 0X7ff7ffffffffffffU;
1086
1087 m = frexp (x, &e) * 0x20000000000000U;
1088
1089 r = m & 0x8000000000000000;;
1090
1091 if (r)
1092 m = -m;
1093
1094 if (e <= -1022)
1095 {
1096 m &= 0x1fffffffffffffU;
1097 m >>= (-1021 - e);
1098 e = -1022;
1099 }
1100
1101 r |= ((uint64_t)(e + 1022)) << 52;
1102 r |= m & 0xfffffffffffffU;
1103 #endif
1104
1105 return r;
1106 }
1107
1108 /* converts an ieee double/binary64 to a double */
1109 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1110 ecb_function_ ecb_const double
1111 ecb_binary64_to_double (uint64_t x)
1112 {
1113 double r;
1114
1115 #if ECB_STDFP
1116 memcpy (&r, &x, 8);
1117 #else
1118 /* emulation, only works for normals and subnormals and +0 */
1119 int neg = x >> 63;
1120 int e = (x >> 52) & 0x7ffU;
1121
1122 x &= 0xfffffffffffffU;
1123
1124 if (e)
1125 x |= 0x10000000000000U;
1126 else
1127 e = 1;
1128
1129 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1130 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1131
1132 r = neg ? -r : r;
1133 #endif
1134
1135 return r;
1136 }
1137
1138 /* convert a float to ieee half/binary16 */
1139 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1140 ecb_function_ ecb_const uint16_t
1141 ecb_float_to_binary16 (float x)
1142 {
1143 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1144 }
1145
1146 /* convert an ieee half/binary16 to float */
1147 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1148 ecb_function_ ecb_const float
1149 ecb_binary16_to_float (uint16_t x)
1150 {
1151 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1152 }
1153
1154 #endif
1155
1156 #endif
1157