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Revision: 1.2
Committed: Mon Nov 19 00:56:08 2018 UTC (5 years, 7 months ago) by root
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Branch: MAIN
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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 (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 #if __i386 || __i386__
170 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
171 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
172 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
173 #elif ECB_GCC_AMD64
174 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
175 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
176 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
177 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
178 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
179 #elif defined __ARM_ARCH_2__ \
180 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
181 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
182 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
183 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
184 || defined __ARM_ARCH_5TEJ__
185 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
186 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
187 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
188 || defined __ARM_ARCH_6T2__
189 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
190 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
191 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
192 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
193 #elif __aarch64__
194 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
195 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
196 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
197 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
198 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
199 #elif defined __s390__ || defined __s390x__
200 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
201 #elif defined __mips__
202 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
203 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
204 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
205 #elif defined __alpha__
206 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
207 #elif defined __hppa__
208 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
209 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
210 #elif defined __ia64__
211 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
212 #elif defined __m68k__
213 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
214 #elif defined __m88k__
215 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
216 #elif defined __sh__
217 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
218 #endif
219 #endif
220 #endif
221
222 #ifndef ECB_MEMORY_FENCE
223 #if ECB_GCC_VERSION(4,7)
224 /* see comment below (stdatomic.h) about the C11 memory model. */
225 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
226 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
227 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
228
229 #elif ECB_CLANG_EXTENSION(c_atomic)
230 /* see comment below (stdatomic.h) about the C11 memory model. */
231 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
232 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
233 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
234
235 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
236 #define ECB_MEMORY_FENCE __sync_synchronize ()
237 #elif _MSC_VER >= 1500 /* VC++ 2008 */
238 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
239 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
240 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
241 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
242 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
243 #elif _MSC_VER >= 1400 /* VC++ 2005 */
244 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
245 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
246 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
247 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
248 #elif defined _WIN32
249 #include <WinNT.h>
250 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
251 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
252 #include <mbarrier.h>
253 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
254 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
255 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
256 #elif __xlC__
257 #define ECB_MEMORY_FENCE __sync ()
258 #endif
259 #endif
260
261 #ifndef ECB_MEMORY_FENCE
262 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
263 /* we assume that these memory fences work on all variables/all memory accesses, */
264 /* not just C11 atomics and atomic accesses */
265 #include <stdatomic.h>
266 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
267 /* any fence other than seq_cst, which isn't very efficient for us. */
268 /* Why that is, we don't know - either the C11 memory model is quite useless */
269 /* for most usages, or gcc and clang have a bug */
270 /* I *currently* lean towards the latter, and inefficiently implement */
271 /* all three of ecb's fences as a seq_cst fence */
272 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
273 /* for all __atomic_thread_fence's except seq_cst */
274 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
275 #endif
276 #endif
277
278 #ifndef ECB_MEMORY_FENCE
279 #if !ECB_AVOID_PTHREADS
280 /*
281 * if you get undefined symbol references to pthread_mutex_lock,
282 * or failure to find pthread.h, then you should implement
283 * the ECB_MEMORY_FENCE operations for your cpu/compiler
284 * OR provide pthread.h and link against the posix thread library
285 * of your system.
286 */
287 #include <pthread.h>
288 #define ECB_NEEDS_PTHREADS 1
289 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
290
291 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
292 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
293 #endif
294 #endif
295
296 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
297 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
298 #endif
299
300 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
301 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
302 #endif
303
304 /*****************************************************************************/
305
306 #if ECB_CPP
307 #define ecb_inline static inline
308 #elif ECB_GCC_VERSION(2,5)
309 #define ecb_inline static __inline__
310 #elif ECB_C99
311 #define ecb_inline static inline
312 #else
313 #define ecb_inline static
314 #endif
315
316 #if ECB_GCC_VERSION(3,3)
317 #define ecb_restrict __restrict__
318 #elif ECB_C99
319 #define ecb_restrict restrict
320 #else
321 #define ecb_restrict
322 #endif
323
324 typedef int ecb_bool;
325
326 #define ECB_CONCAT_(a, b) a ## b
327 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
328 #define ECB_STRINGIFY_(a) # a
329 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
330 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
331
332 #define ecb_function_ ecb_inline
333
334 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
335 #define ecb_attribute(attrlist) __attribute__ (attrlist)
336 #else
337 #define ecb_attribute(attrlist)
338 #endif
339
340 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
341 #define ecb_is_constant(expr) __builtin_constant_p (expr)
342 #else
343 /* possible C11 impl for integral types
344 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
345 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
346
347 #define ecb_is_constant(expr) 0
348 #endif
349
350 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
351 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
352 #else
353 #define ecb_expect(expr,value) (expr)
354 #endif
355
356 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
357 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
358 #else
359 #define ecb_prefetch(addr,rw,locality)
360 #endif
361
362 /* no emulation for ecb_decltype */
363 #if ECB_CPP11
364 // older implementations might have problems with decltype(x)::type, work around it
365 template<class T> struct ecb_decltype_t { typedef T type; };
366 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
367 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
368 #define ecb_decltype(x) __typeof__ (x)
369 #endif
370
371 #if _MSC_VER >= 1300
372 #define ecb_deprecated __declspec (deprecated)
373 #else
374 #define ecb_deprecated ecb_attribute ((__deprecated__))
375 #endif
376
377 #if _MSC_VER >= 1500
378 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
379 #elif ECB_GCC_VERSION(4,5)
380 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
381 #else
382 #define ecb_deprecated_message(msg) ecb_deprecated
383 #endif
384
385 #if _MSC_VER >= 1400
386 #define ecb_noinline __declspec (noinline)
387 #else
388 #define ecb_noinline ecb_attribute ((__noinline__))
389 #endif
390
391 #define ecb_unused ecb_attribute ((__unused__))
392 #define ecb_const ecb_attribute ((__const__))
393 #define ecb_pure ecb_attribute ((__pure__))
394
395 #if ECB_C11 || __IBMC_NORETURN
396 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
397 #define ecb_noreturn _Noreturn
398 #elif ECB_CPP11
399 #define ecb_noreturn [[noreturn]]
400 #elif _MSC_VER >= 1200
401 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
402 #define ecb_noreturn __declspec (noreturn)
403 #else
404 #define ecb_noreturn ecb_attribute ((__noreturn__))
405 #endif
406
407 #if ECB_GCC_VERSION(4,3)
408 #define ecb_artificial ecb_attribute ((__artificial__))
409 #define ecb_hot ecb_attribute ((__hot__))
410 #define ecb_cold ecb_attribute ((__cold__))
411 #else
412 #define ecb_artificial
413 #define ecb_hot
414 #define ecb_cold
415 #endif
416
417 /* put around conditional expressions if you are very sure that the */
418 /* expression is mostly true or mostly false. note that these return */
419 /* booleans, not the expression. */
420 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
421 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
422 /* for compatibility to the rest of the world */
423 #define ecb_likely(expr) ecb_expect_true (expr)
424 #define ecb_unlikely(expr) ecb_expect_false (expr)
425
426 /* count trailing zero bits and count # of one bits */
427 #if ECB_GCC_VERSION(3,4) \
428 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
429 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
430 && ECB_CLANG_BUILTIN(__builtin_popcount))
431 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
432 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
433 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
434 #define ecb_ctz32(x) __builtin_ctz (x)
435 #define ecb_ctz64(x) __builtin_ctzll (x)
436 #define ecb_popcount32(x) __builtin_popcount (x)
437 /* no popcountll */
438 #else
439 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
440 ecb_function_ ecb_const int
441 ecb_ctz32 (uint32_t x)
442 {
443 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
444 unsigned long r;
445 _BitScanForward (&r, x);
446 return (int)r;
447 #else
448 int r = 0;
449
450 x &= ~x + 1; /* this isolates the lowest bit */
451
452 #if ECB_branchless_on_i386
453 r += !!(x & 0xaaaaaaaa) << 0;
454 r += !!(x & 0xcccccccc) << 1;
455 r += !!(x & 0xf0f0f0f0) << 2;
456 r += !!(x & 0xff00ff00) << 3;
457 r += !!(x & 0xffff0000) << 4;
458 #else
459 if (x & 0xaaaaaaaa) r += 1;
460 if (x & 0xcccccccc) r += 2;
461 if (x & 0xf0f0f0f0) r += 4;
462 if (x & 0xff00ff00) r += 8;
463 if (x & 0xffff0000) r += 16;
464 #endif
465
466 return r;
467 #endif
468 }
469
470 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
471 ecb_function_ ecb_const int
472 ecb_ctz64 (uint64_t x)
473 {
474 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
475 unsigned long r;
476 _BitScanForward64 (&r, x);
477 return (int)r;
478 #else
479 int shift = x & 0xffffffff ? 0 : 32;
480 return ecb_ctz32 (x >> shift) + shift;
481 #endif
482 }
483
484 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
485 ecb_function_ ecb_const int
486 ecb_popcount32 (uint32_t x)
487 {
488 x -= (x >> 1) & 0x55555555;
489 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
490 x = ((x >> 4) + x) & 0x0f0f0f0f;
491 x *= 0x01010101;
492
493 return x >> 24;
494 }
495
496 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
497 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
498 {
499 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
500 unsigned long r;
501 _BitScanReverse (&r, x);
502 return (int)r;
503 #else
504 int r = 0;
505
506 if (x >> 16) { x >>= 16; r += 16; }
507 if (x >> 8) { x >>= 8; r += 8; }
508 if (x >> 4) { x >>= 4; r += 4; }
509 if (x >> 2) { x >>= 2; r += 2; }
510 if (x >> 1) { r += 1; }
511
512 return r;
513 #endif
514 }
515
516 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
517 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
518 {
519 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
520 unsigned long r;
521 _BitScanReverse64 (&r, x);
522 return (int)r;
523 #else
524 int r = 0;
525
526 if (x >> 32) { x >>= 32; r += 32; }
527
528 return r + ecb_ld32 (x);
529 #endif
530 }
531 #endif
532
533 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
534 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
535 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
536 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
537
538 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
539 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
540 {
541 return ( (x * 0x0802U & 0x22110U)
542 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
543 }
544
545 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
546 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
547 {
548 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
549 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
550 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
551 x = ( x >> 8 ) | ( x << 8);
552
553 return x;
554 }
555
556 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
557 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
558 {
559 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
560 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
561 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
562 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
563 x = ( x >> 16 ) | ( x << 16);
564
565 return x;
566 }
567
568 /* popcount64 is only available on 64 bit cpus as gcc builtin */
569 /* so for this version we are lazy */
570 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
571 ecb_function_ ecb_const int
572 ecb_popcount64 (uint64_t x)
573 {
574 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
575 }
576
577 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
578 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
579 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
580 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
581 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
582 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
583 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
584 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
585
586 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
587 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
588 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
589 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
590 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
591 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
592 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
593 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
594
595 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
596 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
597 #define ecb_bswap16(x) __builtin_bswap16 (x)
598 #else
599 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
600 #endif
601 #define ecb_bswap32(x) __builtin_bswap32 (x)
602 #define ecb_bswap64(x) __builtin_bswap64 (x)
603 #elif _MSC_VER
604 #include <stdlib.h>
605 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
606 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
607 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
608 #else
609 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
610 ecb_function_ ecb_const uint16_t
611 ecb_bswap16 (uint16_t x)
612 {
613 return ecb_rotl16 (x, 8);
614 }
615
616 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
617 ecb_function_ ecb_const uint32_t
618 ecb_bswap32 (uint32_t x)
619 {
620 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
621 }
622
623 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
624 ecb_function_ ecb_const uint64_t
625 ecb_bswap64 (uint64_t x)
626 {
627 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
628 }
629 #endif
630
631 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
632 #define ecb_unreachable() __builtin_unreachable ()
633 #else
634 /* this seems to work fine, but gcc always emits a warning for it :/ */
635 ecb_inline ecb_noreturn void ecb_unreachable (void);
636 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
637 #endif
638
639 /* try to tell the compiler that some condition is definitely true */
640 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
641
642 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
643 ecb_inline ecb_const uint32_t
644 ecb_byteorder_helper (void)
645 {
646 /* the union code still generates code under pressure in gcc, */
647 /* but less than using pointers, and always seems to */
648 /* successfully return a constant. */
649 /* the reason why we have this horrible preprocessor mess */
650 /* is to avoid it in all cases, at least on common architectures */
651 /* or when using a recent enough gcc version (>= 4.6) */
652 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
653 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
654 #define ECB_LITTLE_ENDIAN 1
655 return 0x44332211;
656 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
657 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
658 #define ECB_BIG_ENDIAN 1
659 return 0x11223344;
660 #else
661 union
662 {
663 uint8_t c[4];
664 uint32_t u;
665 } u = { 0x11, 0x22, 0x33, 0x44 };
666 return u.u;
667 #endif
668 }
669
670 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
671 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
672 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
673 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
674
675 #if ECB_GCC_VERSION(3,0) || ECB_C99
676 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
677 #else
678 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
679 #endif
680
681 #if ECB_CPP
682 template<typename T>
683 static inline T ecb_div_rd (T val, T div)
684 {
685 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
686 }
687 template<typename T>
688 static inline T ecb_div_ru (T val, T div)
689 {
690 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
691 }
692 #else
693 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
694 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
695 #endif
696
697 #if ecb_cplusplus_does_not_suck
698 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
699 template<typename T, int N>
700 static inline int ecb_array_length (const T (&arr)[N])
701 {
702 return N;
703 }
704 #else
705 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
706 #endif
707
708 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
709 ecb_function_ ecb_const uint32_t
710 ecb_binary16_to_binary32 (uint32_t x)
711 {
712 unsigned int s = (x & 0x8000) << (31 - 15);
713 int e = (x >> 10) & 0x001f;
714 unsigned int m = x & 0x03ff;
715
716 if (ecb_expect_false (e == 31))
717 /* infinity or NaN */
718 e = 255 - (127 - 15);
719 else if (ecb_expect_false (!e))
720 {
721 if (ecb_expect_true (!m))
722 /* zero, handled by code below by forcing e to 0 */
723 e = 0 - (127 - 15);
724 else
725 {
726 /* subnormal, renormalise */
727 unsigned int s = 10 - ecb_ld32 (m);
728
729 m = (m << s) & 0x3ff; /* mask implicit bit */
730 e -= s - 1;
731 }
732 }
733
734 /* e and m now are normalised, or zero, (or inf or nan) */
735 e += 127 - 15;
736
737 return s | (e << 23) | (m << (23 - 10));
738 }
739
740 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
741 ecb_function_ ecb_const uint16_t
742 ecb_binary32_to_binary16 (uint32_t x)
743 {
744 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
745 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
746 unsigned int m = x & 0x007fffff;
747
748 x &= 0x7fffffff;
749
750 /* if it's within range of binary16 normals, use fast path */
751 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
752 {
753 /* mantissa round-to-even */
754 m += 0x00000fff + ((m >> (23 - 10)) & 1);
755
756 /* handle overflow */
757 if (ecb_expect_false (m >= 0x00800000))
758 {
759 m >>= 1;
760 e += 1;
761 }
762
763 return s | (e << 10) | (m >> (23 - 10));
764 }
765
766 /* handle large numbers and infinity */
767 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
768 return s | 0x7c00;
769
770 /* handle zero, subnormals and small numbers */
771 if (ecb_expect_true (x < 0x38800000))
772 {
773 /* zero */
774 if (ecb_expect_true (!x))
775 return s;
776
777 /* handle subnormals */
778
779 /* too small, will be zero */
780 if (e < (14 - 24)) /* might not be sharp, but is good enough */
781 return s;
782
783 m |= 0x00800000; /* make implicit bit explicit */
784
785 /* very tricky - we need to round to the nearest e (+10) bit value */
786 {
787 unsigned int bits = 14 - e;
788 unsigned int half = (1 << (bits - 1)) - 1;
789 unsigned int even = (m >> bits) & 1;
790
791 /* if this overflows, we will end up with a normalised number */
792 m = (m + half + even) >> bits;
793 }
794
795 return s | m;
796 }
797
798 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
799 m >>= 13;
800
801 return s | 0x7c00 | m | !m;
802 }
803
804 /*******************************************************************************/
805 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
806
807 /* basically, everything uses "ieee pure-endian" floating point numbers */
808 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
809 #if 0 \
810 || __i386 || __i386__ \
811 || ECB_GCC_AMD64 \
812 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
813 || defined __s390__ || defined __s390x__ \
814 || defined __mips__ \
815 || defined __alpha__ \
816 || defined __hppa__ \
817 || defined __ia64__ \
818 || defined __m68k__ \
819 || defined __m88k__ \
820 || defined __sh__ \
821 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
822 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
823 || defined __aarch64__
824 #define ECB_STDFP 1
825 #include <string.h> /* for memcpy */
826 #else
827 #define ECB_STDFP 0
828 #endif
829
830 #ifndef ECB_NO_LIBM
831
832 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
833
834 /* only the oldest of old doesn't have this one. solaris. */
835 #ifdef INFINITY
836 #define ECB_INFINITY INFINITY
837 #else
838 #define ECB_INFINITY HUGE_VAL
839 #endif
840
841 #ifdef NAN
842 #define ECB_NAN NAN
843 #else
844 #define ECB_NAN ECB_INFINITY
845 #endif
846
847 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
848 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
849 #define ecb_frexpf(x,e) frexpf ((x), (e))
850 #else
851 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
852 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
853 #endif
854
855 /* convert a float to ieee single/binary32 */
856 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
857 ecb_function_ ecb_const uint32_t
858 ecb_float_to_binary32 (float x)
859 {
860 uint32_t r;
861
862 #if ECB_STDFP
863 memcpy (&r, &x, 4);
864 #else
865 /* slow emulation, works for anything but -0 */
866 uint32_t m;
867 int e;
868
869 if (x == 0e0f ) return 0x00000000U;
870 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
871 if (x < -3.40282346638528860e+38f) return 0xff800000U;
872 if (x != x ) return 0x7fbfffffU;
873
874 m = ecb_frexpf (x, &e) * 0x1000000U;
875
876 r = m & 0x80000000U;
877
878 if (r)
879 m = -m;
880
881 if (e <= -126)
882 {
883 m &= 0xffffffU;
884 m >>= (-125 - e);
885 e = -126;
886 }
887
888 r |= (e + 126) << 23;
889 r |= m & 0x7fffffU;
890 #endif
891
892 return r;
893 }
894
895 /* converts an ieee single/binary32 to a float */
896 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
897 ecb_function_ ecb_const float
898 ecb_binary32_to_float (uint32_t x)
899 {
900 float r;
901
902 #if ECB_STDFP
903 memcpy (&r, &x, 4);
904 #else
905 /* emulation, only works for normals and subnormals and +0 */
906 int neg = x >> 31;
907 int e = (x >> 23) & 0xffU;
908
909 x &= 0x7fffffU;
910
911 if (e)
912 x |= 0x800000U;
913 else
914 e = 1;
915
916 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
917 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
918
919 r = neg ? -r : r;
920 #endif
921
922 return r;
923 }
924
925 /* convert a double to ieee double/binary64 */
926 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
927 ecb_function_ ecb_const uint64_t
928 ecb_double_to_binary64 (double x)
929 {
930 uint64_t r;
931
932 #if ECB_STDFP
933 memcpy (&r, &x, 8);
934 #else
935 /* slow emulation, works for anything but -0 */
936 uint64_t m;
937 int e;
938
939 if (x == 0e0 ) return 0x0000000000000000U;
940 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
941 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
942 if (x != x ) return 0X7ff7ffffffffffffU;
943
944 m = frexp (x, &e) * 0x20000000000000U;
945
946 r = m & 0x8000000000000000;;
947
948 if (r)
949 m = -m;
950
951 if (e <= -1022)
952 {
953 m &= 0x1fffffffffffffU;
954 m >>= (-1021 - e);
955 e = -1022;
956 }
957
958 r |= ((uint64_t)(e + 1022)) << 52;
959 r |= m & 0xfffffffffffffU;
960 #endif
961
962 return r;
963 }
964
965 /* converts an ieee double/binary64 to a double */
966 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
967 ecb_function_ ecb_const double
968 ecb_binary64_to_double (uint64_t x)
969 {
970 double r;
971
972 #if ECB_STDFP
973 memcpy (&r, &x, 8);
974 #else
975 /* emulation, only works for normals and subnormals and +0 */
976 int neg = x >> 63;
977 int e = (x >> 52) & 0x7ffU;
978
979 x &= 0xfffffffffffffU;
980
981 if (e)
982 x |= 0x10000000000000U;
983 else
984 e = 1;
985
986 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
987 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
988
989 r = neg ? -r : r;
990 #endif
991
992 return r;
993 }
994
995 /* convert a float to ieee half/binary16 */
996 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
997 ecb_function_ ecb_const uint16_t
998 ecb_float_to_binary16 (float x)
999 {
1000 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1001 }
1002
1003 /* convert an ieee half/binary16 to float */
1004 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1005 ecb_function_ ecb_const float
1006 ecb_binary16_to_float (uint16_t x)
1007 {
1008 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1009 }
1010
1011 #endif
1012
1013 #endif
1014