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Revision: 1.183
Committed: Mon Jan 20 14:10:06 2020 UTC (4 years, 4 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 0x00010008
46
47 #ifdef _WIN32
48 typedef signed char int8_t;
49 typedef unsigned char uint8_t;
50 typedef signed char int_fast8_t;
51 typedef unsigned char uint_fast8_t;
52 typedef signed short int16_t;
53 typedef unsigned short uint16_t;
54 typedef signed int int_fast16_t;
55 typedef unsigned int uint_fast16_t;
56 typedef signed int int32_t;
57 typedef unsigned int uint32_t;
58 typedef signed int int_fast32_t;
59 typedef unsigned int uint_fast32_t;
60 #if __GNUC__
61 typedef signed long long int64_t;
62 typedef unsigned long long uint64_t;
63 #else /* _MSC_VER || __BORLANDC__ */
64 typedef signed __int64 int64_t;
65 typedef unsigned __int64 uint64_t;
66 #endif
67 typedef int64_t int_fast64_t;
68 typedef uint64_t uint_fast64_t;
69 #ifdef _WIN64
70 #define ECB_PTRSIZE 8
71 typedef uint64_t uintptr_t;
72 typedef int64_t intptr_t;
73 #else
74 #define ECB_PTRSIZE 4
75 typedef uint32_t uintptr_t;
76 typedef int32_t intptr_t;
77 #endif
78 #else
79 #include <inttypes.h>
80 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
81 #define ECB_PTRSIZE 8
82 #else
83 #define ECB_PTRSIZE 4
84 #endif
85 #endif
86
87 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
88 #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
89
90 #ifndef ECB_OPTIMIZE_SIZE
91 #if __OPTIMIZE_SIZE__
92 #define ECB_OPTIMIZE_SIZE 1
93 #else
94 #define ECB_OPTIMIZE_SIZE 0
95 #endif
96 #endif
97
98 /* work around x32 idiocy by defining proper macros */
99 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
100 #if _ILP32
101 #define ECB_AMD64_X32 1
102 #else
103 #define ECB_AMD64 1
104 #endif
105 #endif
106
107 /* many compilers define _GNUC_ to some versions but then only implement
108 * what their idiot authors think are the "more important" extensions,
109 * causing enormous grief in return for some better fake benchmark numbers.
110 * or so.
111 * we try to detect these and simply assume they are not gcc - if they have
112 * an issue with that they should have done it right in the first place.
113 */
114 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
115 #define ECB_GCC_VERSION(major,minor) 0
116 #else
117 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
118 #endif
119
120 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
121
122 #if __clang__ && defined __has_builtin
123 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
124 #else
125 #define ECB_CLANG_BUILTIN(x) 0
126 #endif
127
128 #if __clang__ && defined __has_extension
129 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
130 #else
131 #define ECB_CLANG_EXTENSION(x) 0
132 #endif
133
134 #define ECB_CPP (__cplusplus+0)
135 #define ECB_CPP11 (__cplusplus >= 201103L)
136 #define ECB_CPP14 (__cplusplus >= 201402L)
137 #define ECB_CPP17 (__cplusplus >= 201703L)
138
139 #if ECB_CPP
140 #define ECB_C 0
141 #define ECB_STDC_VERSION 0
142 #else
143 #define ECB_C 1
144 #define ECB_STDC_VERSION __STDC_VERSION__
145 #endif
146
147 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
148 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
149 #define ECB_C17 (ECB_STDC_VERSION >= 201710L)
150
151 #if ECB_CPP
152 #define ECB_EXTERN_C extern "C"
153 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
154 #define ECB_EXTERN_C_END }
155 #else
156 #define ECB_EXTERN_C extern
157 #define ECB_EXTERN_C_BEG
158 #define ECB_EXTERN_C_END
159 #endif
160
161 /*****************************************************************************/
162
163 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
164 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
165
166 #if ECB_NO_THREADS
167 #define ECB_NO_SMP 1
168 #endif
169
170 #if ECB_NO_SMP
171 #define ECB_MEMORY_FENCE do { } while (0)
172 #endif
173
174 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
175 #if __xlC__ && ECB_CPP
176 #include <builtins.h>
177 #endif
178
179 #if 1400 <= _MSC_VER
180 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
181 #endif
182
183 #ifndef ECB_MEMORY_FENCE
184 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
185 #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
186 #if __i386 || __i386__
187 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
188 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
189 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
190 #elif ECB_GCC_AMD64
191 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
192 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
193 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
194 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
195 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
196 #elif defined __ARM_ARCH_2__ \
197 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
198 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
199 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
200 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
201 || defined __ARM_ARCH_5TEJ__
202 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
203 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
204 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
205 || defined __ARM_ARCH_6T2__
206 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
207 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
208 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
209 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
210 #elif __aarch64__
211 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
212 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
213 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
214 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
215 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
216 #elif defined __s390__ || defined __s390x__
217 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
218 #elif defined __mips__
219 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
220 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
221 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
222 #elif defined __alpha__
223 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
224 #elif defined __hppa__
225 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
226 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
227 #elif defined __ia64__
228 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
229 #elif defined __m68k__
230 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
231 #elif defined __m88k__
232 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
233 #elif defined __sh__
234 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
235 #endif
236 #endif
237 #endif
238
239 #ifndef ECB_MEMORY_FENCE
240 #if ECB_GCC_VERSION(4,7)
241 /* see comment below (stdatomic.h) about the C11 memory model. */
242 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
243 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
244 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
245 #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
246
247 #elif ECB_CLANG_EXTENSION(c_atomic)
248 /* see comment below (stdatomic.h) about the C11 memory model. */
249 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
250 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
251 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
252 #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
253
254 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
255 #define ECB_MEMORY_FENCE __sync_synchronize ()
256 #elif _MSC_VER >= 1500 /* VC++ 2008 */
257 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
258 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
259 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
260 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
261 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
262 #elif _MSC_VER >= 1400 /* VC++ 2005 */
263 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
264 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
265 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
266 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
267 #elif defined _WIN32
268 #include <WinNT.h>
269 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
270 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
271 #include <mbarrier.h>
272 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
273 #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
274 #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
275 #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
276 #elif __xlC__
277 #define ECB_MEMORY_FENCE __sync ()
278 #endif
279 #endif
280
281 #ifndef ECB_MEMORY_FENCE
282 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
283 /* we assume that these memory fences work on all variables/all memory accesses, */
284 /* not just C11 atomics and atomic accesses */
285 #include <stdatomic.h>
286 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
287 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
288 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
289 #endif
290 #endif
291
292 #ifndef ECB_MEMORY_FENCE
293 #if !ECB_AVOID_PTHREADS
294 /*
295 * if you get undefined symbol references to pthread_mutex_lock,
296 * or failure to find pthread.h, then you should implement
297 * the ECB_MEMORY_FENCE operations for your cpu/compiler
298 * OR provide pthread.h and link against the posix thread library
299 * of your system.
300 */
301 #include <pthread.h>
302 #define ECB_NEEDS_PTHREADS 1
303 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
304
305 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
306 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
307 #endif
308 #endif
309
310 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
311 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
312 #endif
313
314 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
315 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
316 #endif
317
318 #if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
319 #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
320 #endif
321
322 /*****************************************************************************/
323
324 #if ECB_CPP
325 #define ecb_inline static inline
326 #elif ECB_GCC_VERSION(2,5)
327 #define ecb_inline static __inline__
328 #elif ECB_C99
329 #define ecb_inline static inline
330 #else
331 #define ecb_inline static
332 #endif
333
334 #if ECB_GCC_VERSION(3,3)
335 #define ecb_restrict __restrict__
336 #elif ECB_C99
337 #define ecb_restrict restrict
338 #else
339 #define ecb_restrict
340 #endif
341
342 typedef int ecb_bool;
343
344 #define ECB_CONCAT_(a, b) a ## b
345 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
346 #define ECB_STRINGIFY_(a) # a
347 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
348 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
349
350 #define ecb_function_ ecb_inline
351
352 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
353 #define ecb_attribute(attrlist) __attribute__ (attrlist)
354 #else
355 #define ecb_attribute(attrlist)
356 #endif
357
358 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
359 #define ecb_is_constant(expr) __builtin_constant_p (expr)
360 #else
361 /* possible C11 impl for integral types
362 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
363 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
364
365 #define ecb_is_constant(expr) 0
366 #endif
367
368 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
369 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
370 #else
371 #define ecb_expect(expr,value) (expr)
372 #endif
373
374 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
375 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
376 #else
377 #define ecb_prefetch(addr,rw,locality)
378 #endif
379
380 /* no emulation for ecb_decltype */
381 #if ECB_CPP11
382 // older implementations might have problems with decltype(x)::type, work around it
383 template<class T> struct ecb_decltype_t { typedef T type; };
384 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
385 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
386 #define ecb_decltype(x) __typeof__ (x)
387 #endif
388
389 #if _MSC_VER >= 1300
390 #define ecb_deprecated __declspec (deprecated)
391 #else
392 #define ecb_deprecated ecb_attribute ((__deprecated__))
393 #endif
394
395 #if _MSC_VER >= 1500
396 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
397 #elif ECB_GCC_VERSION(4,5)
398 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
399 #else
400 #define ecb_deprecated_message(msg) ecb_deprecated
401 #endif
402
403 #if _MSC_VER >= 1400
404 #define ecb_noinline __declspec (noinline)
405 #else
406 #define ecb_noinline ecb_attribute ((__noinline__))
407 #endif
408
409 #define ecb_unused ecb_attribute ((__unused__))
410 #define ecb_const ecb_attribute ((__const__))
411 #define ecb_pure ecb_attribute ((__pure__))
412
413 #if ECB_C11 || __IBMC_NORETURN
414 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
415 #define ecb_noreturn _Noreturn
416 #elif ECB_CPP11
417 #define ecb_noreturn [[noreturn]]
418 #elif _MSC_VER >= 1200
419 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
420 #define ecb_noreturn __declspec (noreturn)
421 #else
422 #define ecb_noreturn ecb_attribute ((__noreturn__))
423 #endif
424
425 #if ECB_GCC_VERSION(4,3)
426 #define ecb_artificial ecb_attribute ((__artificial__))
427 #define ecb_hot ecb_attribute ((__hot__))
428 #define ecb_cold ecb_attribute ((__cold__))
429 #else
430 #define ecb_artificial
431 #define ecb_hot
432 #define ecb_cold
433 #endif
434
435 /* put around conditional expressions if you are very sure that the */
436 /* expression is mostly true or mostly false. note that these return */
437 /* booleans, not the expression. */
438 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
439 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
440 /* for compatibility to the rest of the world */
441 #define ecb_likely(expr) ecb_expect_true (expr)
442 #define ecb_unlikely(expr) ecb_expect_false (expr)
443
444 /* count trailing zero bits and count # of one bits */
445 #if ECB_GCC_VERSION(3,4) \
446 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
447 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
448 && ECB_CLANG_BUILTIN(__builtin_popcount))
449 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
450 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
451 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
452 #define ecb_ctz32(x) __builtin_ctz (x)
453 #define ecb_ctz64(x) __builtin_ctzll (x)
454 #define ecb_popcount32(x) __builtin_popcount (x)
455 /* no popcountll */
456 #else
457 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
458 ecb_function_ ecb_const int
459 ecb_ctz32 (uint32_t x)
460 {
461 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
462 unsigned long r;
463 _BitScanForward (&r, x);
464 return (int)r;
465 #else
466 int r = 0;
467
468 x &= ~x + 1; /* this isolates the lowest bit */
469
470 #if ECB_branchless_on_i386
471 r += !!(x & 0xaaaaaaaa) << 0;
472 r += !!(x & 0xcccccccc) << 1;
473 r += !!(x & 0xf0f0f0f0) << 2;
474 r += !!(x & 0xff00ff00) << 3;
475 r += !!(x & 0xffff0000) << 4;
476 #else
477 if (x & 0xaaaaaaaa) r += 1;
478 if (x & 0xcccccccc) r += 2;
479 if (x & 0xf0f0f0f0) r += 4;
480 if (x & 0xff00ff00) r += 8;
481 if (x & 0xffff0000) r += 16;
482 #endif
483
484 return r;
485 #endif
486 }
487
488 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
489 ecb_function_ ecb_const int
490 ecb_ctz64 (uint64_t x)
491 {
492 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
493 unsigned long r;
494 _BitScanForward64 (&r, x);
495 return (int)r;
496 #else
497 int shift = x & 0xffffffff ? 0 : 32;
498 return ecb_ctz32 (x >> shift) + shift;
499 #endif
500 }
501
502 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
503 ecb_function_ ecb_const int
504 ecb_popcount32 (uint32_t x)
505 {
506 x -= (x >> 1) & 0x55555555;
507 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
508 x = ((x >> 4) + x) & 0x0f0f0f0f;
509 x *= 0x01010101;
510
511 return x >> 24;
512 }
513
514 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
515 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
516 {
517 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
518 unsigned long r;
519 _BitScanReverse (&r, x);
520 return (int)r;
521 #else
522 int r = 0;
523
524 if (x >> 16) { x >>= 16; r += 16; }
525 if (x >> 8) { x >>= 8; r += 8; }
526 if (x >> 4) { x >>= 4; r += 4; }
527 if (x >> 2) { x >>= 2; r += 2; }
528 if (x >> 1) { r += 1; }
529
530 return r;
531 #endif
532 }
533
534 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
535 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
536 {
537 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
538 unsigned long r;
539 _BitScanReverse64 (&r, x);
540 return (int)r;
541 #else
542 int r = 0;
543
544 if (x >> 32) { x >>= 32; r += 32; }
545
546 return r + ecb_ld32 (x);
547 #endif
548 }
549 #endif
550
551 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
552 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
553 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
554 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
555
556 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
557 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
558 {
559 return ( (x * 0x0802U & 0x22110U)
560 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
561 }
562
563 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
564 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
565 {
566 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
567 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
568 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
569 x = ( x >> 8 ) | ( x << 8);
570
571 return x;
572 }
573
574 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
575 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
576 {
577 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
578 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
579 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
580 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
581 x = ( x >> 16 ) | ( x << 16);
582
583 return x;
584 }
585
586 /* popcount64 is only available on 64 bit cpus as gcc builtin */
587 /* so for this version we are lazy */
588 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
589 ecb_function_ ecb_const int
590 ecb_popcount64 (uint64_t x)
591 {
592 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
593 }
594
595 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
596 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
597 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
598 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
599 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
600 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
601 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
602 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
603
604 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
605 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
606 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
607 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
608 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
609 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
610 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
611 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
612
613 #if ECB_CPP
614
615 inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
616 inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
617 inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
618 inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
619
620 inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
621 inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
622 inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
623 inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
624
625 inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
626 inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
627 inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
628 inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
629
630 inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
631 inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
632 inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
633 inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
634
635 inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
636 inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
637 inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
638
639 inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
640 inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
641 inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
642 inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
643
644 inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
645 inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
646 inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
647 inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
648
649 #endif
650
651 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
652 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
653 #define ecb_bswap16(x) __builtin_bswap16 (x)
654 #else
655 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
656 #endif
657 #define ecb_bswap32(x) __builtin_bswap32 (x)
658 #define ecb_bswap64(x) __builtin_bswap64 (x)
659 #elif _MSC_VER
660 #include <stdlib.h>
661 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
662 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
663 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
664 #else
665 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
666 ecb_function_ ecb_const uint16_t
667 ecb_bswap16 (uint16_t x)
668 {
669 return ecb_rotl16 (x, 8);
670 }
671
672 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
673 ecb_function_ ecb_const uint32_t
674 ecb_bswap32 (uint32_t x)
675 {
676 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
677 }
678
679 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
680 ecb_function_ ecb_const uint64_t
681 ecb_bswap64 (uint64_t x)
682 {
683 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
684 }
685 #endif
686
687 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
688 #define ecb_unreachable() __builtin_unreachable ()
689 #else
690 /* this seems to work fine, but gcc always emits a warning for it :/ */
691 ecb_inline ecb_noreturn void ecb_unreachable (void);
692 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
693 #endif
694
695 /* try to tell the compiler that some condition is definitely true */
696 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
697
698 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
699 ecb_inline ecb_const uint32_t
700 ecb_byteorder_helper (void)
701 {
702 /* the union code still generates code under pressure in gcc, */
703 /* but less than using pointers, and always seems to */
704 /* successfully return a constant. */
705 /* the reason why we have this horrible preprocessor mess */
706 /* is to avoid it in all cases, at least on common architectures */
707 /* or when using a recent enough gcc version (>= 4.6) */
708 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
709 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
710 #define ECB_LITTLE_ENDIAN 1
711 return 0x44332211;
712 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
713 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
714 #define ECB_BIG_ENDIAN 1
715 return 0x11223344;
716 #else
717 union
718 {
719 uint8_t c[4];
720 uint32_t u;
721 } u = { 0x11, 0x22, 0x33, 0x44 };
722 return u.u;
723 #endif
724 }
725
726 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
727 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
728 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
729 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
730
731 /*****************************************************************************/
732 /* unaligned load/store */
733
734 ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
735 ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
736 ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
737
738 ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
739 ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
740 ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
741
742 ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
743 ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
744 ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
745
746 ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
747 ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
748 ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
749
750 ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
751 ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
752 ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
753
754 ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
755 ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
756 ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
757
758 ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
759 ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
760 ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
761
762 ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
763 ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
764 ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
765
766 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)); }
767 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)); }
768 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)); }
769
770 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)); }
771 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)); }
772 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)); }
773
774 #ifdef ECB_CPP
775
776 inline uint8_t ecb_bswap (uint8_t v) { return v; }
777 inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
778 inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
779 inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
780
781 template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
782 template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
783 template<typename T> inline T ecb_peek (const void *ptr) { return *(const T *)ptr; }
784 template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
785 template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
786 template<typename T> inline T ecb_peek_u (const void *ptr) { T v; std::memcpy (&v, ptr, sizeof (v)); return v; }
787 template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
788 template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
789
790 template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
791 template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
792 template<typename T> inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; }
793 template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
794 template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
795 template<typename T> inline void ecb_poke_u (void *ptr, T v) { std::memcpy (ptr, &v, sizeof (v)); }
796 template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
797 template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
798
799 #endif
800
801 /*****************************************************************************/
802
803 #if ECB_GCC_VERSION(3,0) || ECB_C99
804 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
805 #else
806 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
807 #endif
808
809 #if ECB_CPP
810 template<typename T>
811 static inline T ecb_div_rd (T val, T div)
812 {
813 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
814 }
815 template<typename T>
816 static inline T ecb_div_ru (T val, T div)
817 {
818 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
819 }
820 #else
821 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
822 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
823 #endif
824
825 #if ecb_cplusplus_does_not_suck
826 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
827 template<typename T, int N>
828 static inline int ecb_array_length (const T (&arr)[N])
829 {
830 return N;
831 }
832 #else
833 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
834 #endif
835
836 /*****************************************************************************/
837
838 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
839 ecb_function_ ecb_const uint32_t
840 ecb_binary16_to_binary32 (uint32_t x)
841 {
842 unsigned int s = (x & 0x8000) << (31 - 15);
843 int e = (x >> 10) & 0x001f;
844 unsigned int m = x & 0x03ff;
845
846 if (ecb_expect_false (e == 31))
847 /* infinity or NaN */
848 e = 255 - (127 - 15);
849 else if (ecb_expect_false (!e))
850 {
851 if (ecb_expect_true (!m))
852 /* zero, handled by code below by forcing e to 0 */
853 e = 0 - (127 - 15);
854 else
855 {
856 /* subnormal, renormalise */
857 unsigned int s = 10 - ecb_ld32 (m);
858
859 m = (m << s) & 0x3ff; /* mask implicit bit */
860 e -= s - 1;
861 }
862 }
863
864 /* e and m now are normalised, or zero, (or inf or nan) */
865 e += 127 - 15;
866
867 return s | (e << 23) | (m << (23 - 10));
868 }
869
870 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
871 ecb_function_ ecb_const uint16_t
872 ecb_binary32_to_binary16 (uint32_t x)
873 {
874 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
875 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
876 unsigned int m = x & 0x007fffff;
877
878 x &= 0x7fffffff;
879
880 /* if it's within range of binary16 normals, use fast path */
881 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
882 {
883 /* mantissa round-to-even */
884 m += 0x00000fff + ((m >> (23 - 10)) & 1);
885
886 /* handle overflow */
887 if (ecb_expect_false (m >= 0x00800000))
888 {
889 m >>= 1;
890 e += 1;
891 }
892
893 return s | (e << 10) | (m >> (23 - 10));
894 }
895
896 /* handle large numbers and infinity */
897 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
898 return s | 0x7c00;
899
900 /* handle zero, subnormals and small numbers */
901 if (ecb_expect_true (x < 0x38800000))
902 {
903 /* zero */
904 if (ecb_expect_true (!x))
905 return s;
906
907 /* handle subnormals */
908
909 /* too small, will be zero */
910 if (e < (14 - 24)) /* might not be sharp, but is good enough */
911 return s;
912
913 m |= 0x00800000; /* make implicit bit explicit */
914
915 /* very tricky - we need to round to the nearest e (+10) bit value */
916 {
917 unsigned int bits = 14 - e;
918 unsigned int half = (1 << (bits - 1)) - 1;
919 unsigned int even = (m >> bits) & 1;
920
921 /* if this overflows, we will end up with a normalised number */
922 m = (m + half + even) >> bits;
923 }
924
925 return s | m;
926 }
927
928 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
929 m >>= 13;
930
931 return s | 0x7c00 | m | !m;
932 }
933
934 /*******************************************************************************/
935 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
936
937 /* basically, everything uses "ieee pure-endian" floating point numbers */
938 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
939 #if 0 \
940 || __i386 || __i386__ \
941 || ECB_GCC_AMD64 \
942 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
943 || defined __s390__ || defined __s390x__ \
944 || defined __mips__ \
945 || defined __alpha__ \
946 || defined __hppa__ \
947 || defined __ia64__ \
948 || defined __m68k__ \
949 || defined __m88k__ \
950 || defined __sh__ \
951 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
952 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
953 || defined __aarch64__
954 #define ECB_STDFP 1
955 #include <string.h> /* for memcpy */
956 #else
957 #define ECB_STDFP 0
958 #endif
959
960 #ifndef ECB_NO_LIBM
961
962 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
963
964 /* only the oldest of old doesn't have this one. solaris. */
965 #ifdef INFINITY
966 #define ECB_INFINITY INFINITY
967 #else
968 #define ECB_INFINITY HUGE_VAL
969 #endif
970
971 #ifdef NAN
972 #define ECB_NAN NAN
973 #else
974 #define ECB_NAN ECB_INFINITY
975 #endif
976
977 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
978 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
979 #define ecb_frexpf(x,e) frexpf ((x), (e))
980 #else
981 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
982 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
983 #endif
984
985 /* convert a float to ieee single/binary32 */
986 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
987 ecb_function_ ecb_const uint32_t
988 ecb_float_to_binary32 (float x)
989 {
990 uint32_t r;
991
992 #if ECB_STDFP
993 memcpy (&r, &x, 4);
994 #else
995 /* slow emulation, works for anything but -0 */
996 uint32_t m;
997 int e;
998
999 if (x == 0e0f ) return 0x00000000U;
1000 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1001 if (x < -3.40282346638528860e+38f) return 0xff800000U;
1002 if (x != x ) return 0x7fbfffffU;
1003
1004 m = ecb_frexpf (x, &e) * 0x1000000U;
1005
1006 r = m & 0x80000000U;
1007
1008 if (r)
1009 m = -m;
1010
1011 if (e <= -126)
1012 {
1013 m &= 0xffffffU;
1014 m >>= (-125 - e);
1015 e = -126;
1016 }
1017
1018 r |= (e + 126) << 23;
1019 r |= m & 0x7fffffU;
1020 #endif
1021
1022 return r;
1023 }
1024
1025 /* converts an ieee single/binary32 to a float */
1026 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1027 ecb_function_ ecb_const float
1028 ecb_binary32_to_float (uint32_t x)
1029 {
1030 float r;
1031
1032 #if ECB_STDFP
1033 memcpy (&r, &x, 4);
1034 #else
1035 /* emulation, only works for normals and subnormals and +0 */
1036 int neg = x >> 31;
1037 int e = (x >> 23) & 0xffU;
1038
1039 x &= 0x7fffffU;
1040
1041 if (e)
1042 x |= 0x800000U;
1043 else
1044 e = 1;
1045
1046 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1047 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1048
1049 r = neg ? -r : r;
1050 #endif
1051
1052 return r;
1053 }
1054
1055 /* convert a double to ieee double/binary64 */
1056 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1057 ecb_function_ ecb_const uint64_t
1058 ecb_double_to_binary64 (double x)
1059 {
1060 uint64_t r;
1061
1062 #if ECB_STDFP
1063 memcpy (&r, &x, 8);
1064 #else
1065 /* slow emulation, works for anything but -0 */
1066 uint64_t m;
1067 int e;
1068
1069 if (x == 0e0 ) return 0x0000000000000000U;
1070 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1071 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1072 if (x != x ) return 0X7ff7ffffffffffffU;
1073
1074 m = frexp (x, &e) * 0x20000000000000U;
1075
1076 r = m & 0x8000000000000000;;
1077
1078 if (r)
1079 m = -m;
1080
1081 if (e <= -1022)
1082 {
1083 m &= 0x1fffffffffffffU;
1084 m >>= (-1021 - e);
1085 e = -1022;
1086 }
1087
1088 r |= ((uint64_t)(e + 1022)) << 52;
1089 r |= m & 0xfffffffffffffU;
1090 #endif
1091
1092 return r;
1093 }
1094
1095 /* converts an ieee double/binary64 to a double */
1096 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1097 ecb_function_ ecb_const double
1098 ecb_binary64_to_double (uint64_t x)
1099 {
1100 double r;
1101
1102 #if ECB_STDFP
1103 memcpy (&r, &x, 8);
1104 #else
1105 /* emulation, only works for normals and subnormals and +0 */
1106 int neg = x >> 63;
1107 int e = (x >> 52) & 0x7ffU;
1108
1109 x &= 0xfffffffffffffU;
1110
1111 if (e)
1112 x |= 0x10000000000000U;
1113 else
1114 e = 1;
1115
1116 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1117 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1118
1119 r = neg ? -r : r;
1120 #endif
1121
1122 return r;
1123 }
1124
1125 /* convert a float to ieee half/binary16 */
1126 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1127 ecb_function_ ecb_const uint16_t
1128 ecb_float_to_binary16 (float x)
1129 {
1130 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1131 }
1132
1133 /* convert an ieee half/binary16 to float */
1134 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1135 ecb_function_ ecb_const float
1136 ecb_binary16_to_float (uint16_t x)
1137 {
1138 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1139 }
1140
1141 #endif
1142
1143 #endif
1144