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Committed: Mon Nov 19 00:10:34 2018 UTC (5 years, 7 months ago) by root
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Alternatively, the contents of this file may be used under the terms of
30 * the GNU General Public License ("GPL") version 2 or any later version,
31 * in which case the provisions of the GPL are applicable instead of
32 * the above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the BSD license, indicate your decision
35 * by deleting the provisions above and replace them with the notice
36 * and other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file under
38 * either the BSD or the GPL.
39 */
40
41 #ifndef ECB_H
42 #define ECB_H
43
44 /* 16 bits major, 16 bits minor */
45 #define ECB_VERSION 0x00010005
46
47 #ifdef _WIN32
48 typedef signed char int8_t;
49 typedef unsigned char uint8_t;
50 typedef signed short int16_t;
51 typedef unsigned short uint16_t;
52 typedef signed int int32_t;
53 typedef unsigned int uint32_t;
54 #if __GNUC__
55 typedef signed long long int64_t;
56 typedef unsigned long long uint64_t;
57 #else /* _MSC_VER || __BORLANDC__ */
58 typedef signed __int64 int64_t;
59 typedef unsigned __int64 uint64_t;
60 #endif
61 #ifdef _WIN64
62 #define ECB_PTRSIZE 8
63 typedef uint64_t uintptr_t;
64 typedef int64_t intptr_t;
65 #else
66 #define ECB_PTRSIZE 4
67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t;
69 #endif
70 #else
71 #include <inttypes.h>
72 #if (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
121 #if ECB_CPP
122 #define ECB_C 0
123 #define ECB_STDC_VERSION 0
124 #else
125 #define ECB_C 1
126 #define ECB_STDC_VERSION __STDC_VERSION__
127 #endif
128
129 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
130 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
131
132 #if ECB_CPP
133 #define ECB_EXTERN_C extern "C"
134 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
135 #define ECB_EXTERN_C_END }
136 #else
137 #define ECB_EXTERN_C extern
138 #define ECB_EXTERN_C_BEG
139 #define ECB_EXTERN_C_END
140 #endif
141
142 /*****************************************************************************/
143
144 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
145 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
146
147 #if ECB_NO_THREADS
148 #define ECB_NO_SMP 1
149 #endif
150
151 #if ECB_NO_SMP
152 #define ECB_MEMORY_FENCE do { } while (0)
153 #endif
154
155 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
156 #if __xlC__ && ECB_CPP
157 #include <builtins.h>
158 #endif
159
160 #if 1400 <= _MSC_VER
161 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
162 #endif
163
164 #ifndef ECB_MEMORY_FENCE
165 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
166 #if __i386 || __i386__
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
168 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
169 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
170 #elif ECB_GCC_AMD64
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
172 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
173 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
174 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
175 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
176 #elif defined __ARM_ARCH_2__ \
177 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
178 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
179 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
180 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
181 || defined __ARM_ARCH_5TEJ__
182 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
183 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
184 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
185 || defined __ARM_ARCH_6T2__
186 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
187 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
188 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
189 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
190 #elif __aarch64__
191 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
192 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
194 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
195 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
196 #elif defined __s390__ || defined __s390x__
197 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
198 #elif defined __mips__
199 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
200 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
201 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
202 #elif defined __alpha__
203 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
204 #elif defined __hppa__
205 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
206 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
207 #elif defined __ia64__
208 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
209 #elif defined __m68k__
210 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
211 #elif defined __m88k__
212 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
213 #elif defined __sh__
214 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
215 #endif
216 #endif
217 #endif
218
219 #ifndef ECB_MEMORY_FENCE
220 #if ECB_GCC_VERSION(4,7)
221 /* see comment below (stdatomic.h) about the C11 memory model. */
222 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
223 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
224 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
225
226 #elif ECB_CLANG_EXTENSION(c_atomic)
227 /* see comment below (stdatomic.h) about the C11 memory model. */
228 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
229 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
230 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
231
232 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
233 #define ECB_MEMORY_FENCE __sync_synchronize ()
234 #elif _MSC_VER >= 1500 /* VC++ 2008 */
235 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
236 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
237 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
238 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
239 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
240 #elif _MSC_VER >= 1400 /* VC++ 2005 */
241 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
242 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
243 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
244 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
245 #elif defined _WIN32
246 #include <WinNT.h>
247 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
248 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
249 #include <mbarrier.h>
250 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
251 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
252 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
253 #elif __xlC__
254 #define ECB_MEMORY_FENCE __sync ()
255 #endif
256 #endif
257
258 #ifndef ECB_MEMORY_FENCE
259 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
260 /* we assume that these memory fences work on all variables/all memory accesses, */
261 /* not just C11 atomics and atomic accesses */
262 #include <stdatomic.h>
263 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
264 /* any fence other than seq_cst, which isn't very efficient for us. */
265 /* Why that is, we don't know - either the C11 memory model is quite useless */
266 /* for most usages, or gcc and clang have a bug */
267 /* I *currently* lean towards the latter, and inefficiently implement */
268 /* all three of ecb's fences as a seq_cst fence */
269 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
270 /* for all __atomic_thread_fence's except seq_cst */
271 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
272 #endif
273 #endif
274
275 #ifndef ECB_MEMORY_FENCE
276 #if !ECB_AVOID_PTHREADS
277 /*
278 * if you get undefined symbol references to pthread_mutex_lock,
279 * or failure to find pthread.h, then you should implement
280 * the ECB_MEMORY_FENCE operations for your cpu/compiler
281 * OR provide pthread.h and link against the posix thread library
282 * of your system.
283 */
284 #include <pthread.h>
285 #define ECB_NEEDS_PTHREADS 1
286 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
287
288 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
289 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
290 #endif
291 #endif
292
293 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
294 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
295 #endif
296
297 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
298 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
299 #endif
300
301 /*****************************************************************************/
302
303 #if ECB_CPP
304 #define ecb_inline static inline
305 #elif ECB_GCC_VERSION(2,5)
306 #define ecb_inline static __inline__
307 #elif ECB_C99
308 #define ecb_inline static inline
309 #else
310 #define ecb_inline static
311 #endif
312
313 #if ECB_GCC_VERSION(3,3)
314 #define ecb_restrict __restrict__
315 #elif ECB_C99
316 #define ecb_restrict restrict
317 #else
318 #define ecb_restrict
319 #endif
320
321 typedef int ecb_bool;
322
323 #define ECB_CONCAT_(a, b) a ## b
324 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
325 #define ECB_STRINGIFY_(a) # a
326 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
327 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
328
329 #define ecb_function_ ecb_inline
330
331 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
332 #define ecb_attribute(attrlist) __attribute__ (attrlist)
333 #else
334 #define ecb_attribute(attrlist)
335 #endif
336
337 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
338 #define ecb_is_constant(expr) __builtin_constant_p (expr)
339 #else
340 /* possible C11 impl for integral types
341 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
342 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
343
344 #define ecb_is_constant(expr) 0
345 #endif
346
347 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
348 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
349 #else
350 #define ecb_expect(expr,value) (expr)
351 #endif
352
353 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
354 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
355 #else
356 #define ecb_prefetch(addr,rw,locality)
357 #endif
358
359 /* no emulation for ecb_decltype */
360 #if ECB_CPP11
361 // older implementations might have problems with decltype(x)::type, work around it
362 template<class T> struct ecb_decltype_t { typedef T type; };
363 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
364 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
365 #define ecb_decltype(x) __typeof__ (x)
366 #endif
367
368 #if _MSC_VER >= 1300
369 #define ecb_deprecated __declspec (deprecated)
370 #else
371 #define ecb_deprecated ecb_attribute ((__deprecated__))
372 #endif
373
374 #if _MSC_VER >= 1500
375 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
376 #elif ECB_GCC_VERSION(4,5)
377 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
378 #else
379 #define ecb_deprecated_message(msg) ecb_deprecated
380 #endif
381
382 #if _MSC_VER >= 1400
383 #define ecb_noinline __declspec (noinline)
384 #else
385 #define ecb_noinline ecb_attribute ((__noinline__))
386 #endif
387
388 #define ecb_unused ecb_attribute ((__unused__))
389 #define ecb_const ecb_attribute ((__const__))
390 #define ecb_pure ecb_attribute ((__pure__))
391
392 #if ECB_C11 || __IBMC_NORETURN
393 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
394 #define ecb_noreturn _Noreturn
395 #elif ECB_CPP11
396 #define ecb_noreturn [[noreturn]]
397 #elif _MSC_VER >= 1200
398 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
399 #define ecb_noreturn __declspec (noreturn)
400 #else
401 #define ecb_noreturn ecb_attribute ((__noreturn__))
402 #endif
403
404 #if ECB_GCC_VERSION(4,3)
405 #define ecb_artificial ecb_attribute ((__artificial__))
406 #define ecb_hot ecb_attribute ((__hot__))
407 #define ecb_cold ecb_attribute ((__cold__))
408 #else
409 #define ecb_artificial
410 #define ecb_hot
411 #define ecb_cold
412 #endif
413
414 /* put around conditional expressions if you are very sure that the */
415 /* expression is mostly true or mostly false. note that these return */
416 /* booleans, not the expression. */
417 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
418 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
419 /* for compatibility to the rest of the world */
420 #define ecb_likely(expr) ecb_expect_true (expr)
421 #define ecb_unlikely(expr) ecb_expect_false (expr)
422
423 /* count trailing zero bits and count # of one bits */
424 #if ECB_GCC_VERSION(3,4) \
425 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
426 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
427 && ECB_CLANG_BUILTIN(__builtin_popcount))
428 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
429 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
430 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
431 #define ecb_ctz32(x) __builtin_ctz (x)
432 #define ecb_ctz64(x) __builtin_ctzll (x)
433 #define ecb_popcount32(x) __builtin_popcount (x)
434 /* no popcountll */
435 #else
436 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
437 ecb_function_ ecb_const int
438 ecb_ctz32 (uint32_t x)
439 {
440 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
441 unsigned long r;
442 _BitScanForward (&r, x);
443 return (int)r;
444 #else
445 int r = 0;
446
447 x &= ~x + 1; /* this isolates the lowest bit */
448
449 #if ECB_branchless_on_i386
450 r += !!(x & 0xaaaaaaaa) << 0;
451 r += !!(x & 0xcccccccc) << 1;
452 r += !!(x & 0xf0f0f0f0) << 2;
453 r += !!(x & 0xff00ff00) << 3;
454 r += !!(x & 0xffff0000) << 4;
455 #else
456 if (x & 0xaaaaaaaa) r += 1;
457 if (x & 0xcccccccc) r += 2;
458 if (x & 0xf0f0f0f0) r += 4;
459 if (x & 0xff00ff00) r += 8;
460 if (x & 0xffff0000) r += 16;
461 #endif
462
463 return r;
464 #endif
465 }
466
467 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
468 ecb_function_ ecb_const int
469 ecb_ctz64 (uint64_t x)
470 {
471 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
472 unsigned long r;
473 _BitScanForward64 (&r, x);
474 return (int)r;
475 #else
476 int shift = x & 0xffffffff ? 0 : 32;
477 return ecb_ctz32 (x >> shift) + shift;
478 #endif
479 }
480
481 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
482 ecb_function_ ecb_const int
483 ecb_popcount32 (uint32_t x)
484 {
485 x -= (x >> 1) & 0x55555555;
486 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
487 x = ((x >> 4) + x) & 0x0f0f0f0f;
488 x *= 0x01010101;
489
490 return x >> 24;
491 }
492
493 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
494 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
495 {
496 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
497 unsigned long r;
498 _BitScanReverse (&r, x);
499 return (int)r;
500 #else
501 int r = 0;
502
503 if (x >> 16) { x >>= 16; r += 16; }
504 if (x >> 8) { x >>= 8; r += 8; }
505 if (x >> 4) { x >>= 4; r += 4; }
506 if (x >> 2) { x >>= 2; r += 2; }
507 if (x >> 1) { r += 1; }
508
509 return r;
510 #endif
511 }
512
513 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
514 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
515 {
516 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
517 unsigned long r;
518 _BitScanReverse64 (&r, x);
519 return (int)r;
520 #else
521 int r = 0;
522
523 if (x >> 32) { x >>= 32; r += 32; }
524
525 return r + ecb_ld32 (x);
526 #endif
527 }
528 #endif
529
530 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
531 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
532 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
533 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
534
535 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
536 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
537 {
538 return ( (x * 0x0802U & 0x22110U)
539 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
540 }
541
542 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
543 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
544 {
545 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
546 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
547 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
548 x = ( x >> 8 ) | ( x << 8);
549
550 return x;
551 }
552
553 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
554 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
555 {
556 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
557 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
558 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
559 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
560 x = ( x >> 16 ) | ( x << 16);
561
562 return x;
563 }
564
565 /* popcount64 is only available on 64 bit cpus as gcc builtin */
566 /* so for this version we are lazy */
567 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
568 ecb_function_ ecb_const int
569 ecb_popcount64 (uint64_t x)
570 {
571 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
572 }
573
574 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
575 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
576 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
577 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
578 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
579 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
580 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
581 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
582
583 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
584 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
585 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
586 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
587 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
588 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
589 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
590 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
591
592 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
593 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
594 #define ecb_bswap16(x) __builtin_bswap16 (x)
595 #else
596 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
597 #endif
598 #define ecb_bswap32(x) __builtin_bswap32 (x)
599 #define ecb_bswap64(x) __builtin_bswap64 (x)
600 #elif _MSC_VER
601 #include <stdlib.h>
602 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
603 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
604 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
605 #else
606 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
607 ecb_function_ ecb_const uint16_t
608 ecb_bswap16 (uint16_t x)
609 {
610 return ecb_rotl16 (x, 8);
611 }
612
613 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
614 ecb_function_ ecb_const uint32_t
615 ecb_bswap32 (uint32_t x)
616 {
617 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
618 }
619
620 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
621 ecb_function_ ecb_const uint64_t
622 ecb_bswap64 (uint64_t x)
623 {
624 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
625 }
626 #endif
627
628 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
629 #define ecb_unreachable() __builtin_unreachable ()
630 #else
631 /* this seems to work fine, but gcc always emits a warning for it :/ */
632 ecb_inline ecb_noreturn void ecb_unreachable (void);
633 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
634 #endif
635
636 /* try to tell the compiler that some condition is definitely true */
637 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
638
639 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
640 ecb_inline ecb_const uint32_t
641 ecb_byteorder_helper (void)
642 {
643 /* the union code still generates code under pressure in gcc, */
644 /* but less than using pointers, and always seems to */
645 /* successfully return a constant. */
646 /* the reason why we have this horrible preprocessor mess */
647 /* is to avoid it in all cases, at least on common architectures */
648 /* or when using a recent enough gcc version (>= 4.6) */
649 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
650 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
651 #define ECB_LITTLE_ENDIAN 1
652 return 0x44332211;
653 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
654 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
655 #define ECB_BIG_ENDIAN 1
656 return 0x11223344;
657 #else
658 union
659 {
660 uint8_t c[4];
661 uint32_t u;
662 } u = { 0x11, 0x22, 0x33, 0x44 };
663 return u.u;
664 #endif
665 }
666
667 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
668 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
669 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
670 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
671
672 #if ECB_GCC_VERSION(3,0) || ECB_C99
673 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
674 #else
675 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
676 #endif
677
678 #if ECB_CPP
679 template<typename T>
680 static inline T ecb_div_rd (T val, T div)
681 {
682 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
683 }
684 template<typename T>
685 static inline T ecb_div_ru (T val, T div)
686 {
687 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
688 }
689 #else
690 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
691 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
692 #endif
693
694 #if ecb_cplusplus_does_not_suck
695 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
696 template<typename T, int N>
697 static inline int ecb_array_length (const T (&arr)[N])
698 {
699 return N;
700 }
701 #else
702 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
703 #endif
704
705 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
706 ecb_function_ ecb_const uint32_t
707 ecb_binary16_to_binary32 (uint32_t x)
708 {
709 unsigned int s = (x & 0x8000) << (31 - 15);
710 int e = (x >> 10) & 0x001f;
711 unsigned int m = x & 0x03ff;
712
713 if (ecb_expect_false (e == 31))
714 /* infinity or NaN */
715 e = 255 - (127 - 15);
716 else if (ecb_expect_false (!e))
717 {
718 if (ecb_expect_true (!m))
719 /* zero, handled by code below by forcing e to 0 */
720 e = 0 - (127 - 15);
721 else
722 {
723 /* subnormal, renormalise */
724 unsigned int s = 10 - ecb_ld32 (m);
725
726 m = (m << s) & 0x3ff; /* mask implicit bit */
727 e -= s - 1;
728 }
729 }
730
731 /* e and m now are normalised, or zero, (or inf or nan) */
732 e += 127 - 15;
733
734 return s | (e << 23) | (m << (23 - 10));
735 }
736
737 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
738 ecb_function_ ecb_const uint16_t
739 ecb_binary32_to_binary16 (uint32_t x)
740 {
741 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
742 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
743 unsigned int m = x & 0x007fffff;
744
745 x &= 0x7fffffff;
746
747 /* if it's within range of binary16 normals, use fast path */
748 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
749 {
750 /* mantissa round-to-even */
751 m += 0x00000fff + ((m >> (23 - 10)) & 1);
752
753 /* handle overflow */
754 if (ecb_expect_false (m >= 0x00800000))
755 {
756 m >>= 1;
757 e += 1;
758 }
759
760 return s | (e << 10) | (m >> (23 - 10));
761 }
762
763 /* handle large numbers and infinity */
764 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
765 return s | 0x7c00;
766
767 /* handle zero, subnormals and small numbers */
768 if (ecb_expect_true (x < 0x38800000))
769 {
770 /* zero */
771 if (ecb_expect_true (!x))
772 return s;
773
774 /* handle subnormals */
775
776 /* too small, will be zero */
777 if (e < (14 - 24)) /* might not be sharp, but is good enough */
778 return s;
779
780 m |= 0x00800000; /* make implicit bit explicit */
781
782 /* very tricky - we need to round to the nearest e (+10) bit value */
783 {
784 unsigned int bits = 14 - e;
785 unsigned int half = (1 << (bits - 1)) - 1;
786 unsigned int even = (m >> bits) & 1;
787
788 /* if this overflows, we will end up with a normalised number */
789 m = (m + half + even) >> bits;
790 }
791
792 return s | m;
793 }
794
795 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
796 m >>= 13;
797
798 return s | 0x7c00 | m | !m;
799 }
800
801 /*******************************************************************************/
802 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
803
804 /* basically, everything uses "ieee pure-endian" floating point numbers */
805 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
806 #if 0 \
807 || __i386 || __i386__ \
808 || ECB_GCC_AMD64 \
809 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
810 || defined __s390__ || defined __s390x__ \
811 || defined __mips__ \
812 || defined __alpha__ \
813 || defined __hppa__ \
814 || defined __ia64__ \
815 || defined __m68k__ \
816 || defined __m88k__ \
817 || defined __sh__ \
818 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
819 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
820 || defined __aarch64__
821 #define ECB_STDFP 1
822 #include <string.h> /* for memcpy */
823 #else
824 #define ECB_STDFP 0
825 #endif
826
827 #ifndef ECB_NO_LIBM
828
829 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
830
831 /* only the oldest of old doesn't have this one. solaris. */
832 #ifdef INFINITY
833 #define ECB_INFINITY INFINITY
834 #else
835 #define ECB_INFINITY HUGE_VAL
836 #endif
837
838 #ifdef NAN
839 #define ECB_NAN NAN
840 #else
841 #define ECB_NAN ECB_INFINITY
842 #endif
843
844 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
845 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
846 #define ecb_frexpf(x,e) frexpf ((x), (e))
847 #else
848 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
849 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
850 #endif
851
852 /* convert a float to ieee single/binary32 */
853 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
854 ecb_function_ ecb_const uint32_t
855 ecb_float_to_binary32 (float x)
856 {
857 uint32_t r;
858
859 #if ECB_STDFP
860 memcpy (&r, &x, 4);
861 #else
862 /* slow emulation, works for anything but -0 */
863 uint32_t m;
864 int e;
865
866 if (x == 0e0f ) return 0x00000000U;
867 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
868 if (x < -3.40282346638528860e+38f) return 0xff800000U;
869 if (x != x ) return 0x7fbfffffU;
870
871 m = ecb_frexpf (x, &e) * 0x1000000U;
872
873 r = m & 0x80000000U;
874
875 if (r)
876 m = -m;
877
878 if (e <= -126)
879 {
880 m &= 0xffffffU;
881 m >>= (-125 - e);
882 e = -126;
883 }
884
885 r |= (e + 126) << 23;
886 r |= m & 0x7fffffU;
887 #endif
888
889 return r;
890 }
891
892 /* converts an ieee single/binary32 to a float */
893 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
894 ecb_function_ ecb_const float
895 ecb_binary32_to_float (uint32_t x)
896 {
897 float r;
898
899 #if ECB_STDFP
900 memcpy (&r, &x, 4);
901 #else
902 /* emulation, only works for normals and subnormals and +0 */
903 int neg = x >> 31;
904 int e = (x >> 23) & 0xffU;
905
906 x &= 0x7fffffU;
907
908 if (e)
909 x |= 0x800000U;
910 else
911 e = 1;
912
913 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
914 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
915
916 r = neg ? -r : r;
917 #endif
918
919 return r;
920 }
921
922 /* convert a double to ieee double/binary64 */
923 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
924 ecb_function_ ecb_const uint64_t
925 ecb_double_to_binary64 (double x)
926 {
927 uint64_t r;
928
929 #if ECB_STDFP
930 memcpy (&r, &x, 8);
931 #else
932 /* slow emulation, works for anything but -0 */
933 uint64_t m;
934 int e;
935
936 if (x == 0e0 ) return 0x0000000000000000U;
937 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
938 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
939 if (x != x ) return 0X7ff7ffffffffffffU;
940
941 m = frexp (x, &e) * 0x20000000000000U;
942
943 r = m & 0x8000000000000000;;
944
945 if (r)
946 m = -m;
947
948 if (e <= -1022)
949 {
950 m &= 0x1fffffffffffffU;
951 m >>= (-1021 - e);
952 e = -1022;
953 }
954
955 r |= ((uint64_t)(e + 1022)) << 52;
956 r |= m & 0xfffffffffffffU;
957 #endif
958
959 return r;
960 }
961
962 /* converts an ieee double/binary64 to a double */
963 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
964 ecb_function_ ecb_const double
965 ecb_binary64_to_double (uint64_t x)
966 {
967 double r;
968
969 #if ECB_STDFP
970 memcpy (&r, &x, 8);
971 #else
972 /* emulation, only works for normals and subnormals and +0 */
973 int neg = x >> 63;
974 int e = (x >> 52) & 0x7ffU;
975
976 x &= 0xfffffffffffffU;
977
978 if (e)
979 x |= 0x10000000000000U;
980 else
981 e = 1;
982
983 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
984 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
985
986 r = neg ? -r : r;
987 #endif
988
989 return r;
990 }
991
992 /* convert a float to ieee half/binary16 */
993 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
994 ecb_function_ ecb_const uint16_t
995 ecb_float_to_binary16 (float x)
996 {
997 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
998 }
999
1000 /* convert an ieee half/binary16 to float */
1001 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1002 ecb_function_ ecb_const float
1003 ecb_binary16_to_float (uint16_t x)
1004 {
1005 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1006 }
1007
1008 #endif
1009
1010 #endif
1011