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Revision: 1.188
Committed: Fri Mar 19 17:29:57 2021 UTC (3 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.187: +7 -1 lines
Log Message:
exponents can be negative

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# Content
1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2015,2018-2020 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 #include <string.h> /* for memcpy */
48
49 #if defined (_WIN32) && !defined (__MINGW32__)
50 typedef signed char int8_t;
51 typedef unsigned char uint8_t;
52 typedef signed char int_fast8_t;
53 typedef unsigned char uint_fast8_t;
54 typedef signed short int16_t;
55 typedef unsigned short uint16_t;
56 typedef signed int int_fast16_t;
57 typedef unsigned int uint_fast16_t;
58 typedef signed int int32_t;
59 typedef unsigned int uint32_t;
60 typedef signed int int_fast32_t;
61 typedef unsigned int uint_fast32_t;
62 #if __GNUC__
63 typedef signed long long int64_t;
64 typedef unsigned long long uint64_t;
65 #else /* _MSC_VER || __BORLANDC__ */
66 typedef signed __int64 int64_t;
67 typedef unsigned __int64 uint64_t;
68 #endif
69 typedef int64_t int_fast64_t;
70 typedef uint64_t uint_fast64_t;
71 #ifdef _WIN64
72 #define ECB_PTRSIZE 8
73 typedef uint64_t uintptr_t;
74 typedef int64_t intptr_t;
75 #else
76 #define ECB_PTRSIZE 4
77 typedef uint32_t uintptr_t;
78 typedef int32_t intptr_t;
79 #endif
80 #else
81 #include <inttypes.h>
82 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
83 #define ECB_PTRSIZE 8
84 #else
85 #define ECB_PTRSIZE 4
86 #endif
87 #endif
88
89 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
90 #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
91
92 #ifndef ECB_OPTIMIZE_SIZE
93 #if __OPTIMIZE_SIZE__
94 #define ECB_OPTIMIZE_SIZE 1
95 #else
96 #define ECB_OPTIMIZE_SIZE 0
97 #endif
98 #endif
99
100 /* work around x32 idiocy by defining proper macros */
101 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
102 #if _ILP32
103 #define ECB_AMD64_X32 1
104 #else
105 #define ECB_AMD64 1
106 #endif
107 #endif
108
109 /* many compilers define _GNUC_ to some versions but then only implement
110 * what their idiot authors think are the "more important" extensions,
111 * causing enormous grief in return for some better fake benchmark numbers.
112 * or so.
113 * we try to detect these and simply assume they are not gcc - if they have
114 * an issue with that they should have done it right in the first place.
115 */
116 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
117 #define ECB_GCC_VERSION(major,minor) 0
118 #else
119 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
120 #endif
121
122 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
123
124 #if __clang__ && defined __has_builtin
125 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
126 #else
127 #define ECB_CLANG_BUILTIN(x) 0
128 #endif
129
130 #if __clang__ && defined __has_extension
131 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
132 #else
133 #define ECB_CLANG_EXTENSION(x) 0
134 #endif
135
136 #define ECB_CPP (__cplusplus+0)
137 #define ECB_CPP11 (__cplusplus >= 201103L)
138 #define ECB_CPP14 (__cplusplus >= 201402L)
139 #define ECB_CPP17 (__cplusplus >= 201703L)
140
141 #if ECB_CPP
142 #define ECB_C 0
143 #define ECB_STDC_VERSION 0
144 #else
145 #define ECB_C 1
146 #define ECB_STDC_VERSION __STDC_VERSION__
147 #endif
148
149 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
150 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
151 #define ECB_C17 (ECB_STDC_VERSION >= 201710L)
152
153 #if ECB_CPP
154 #define ECB_EXTERN_C extern "C"
155 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
156 #define ECB_EXTERN_C_END }
157 #else
158 #define ECB_EXTERN_C extern
159 #define ECB_EXTERN_C_BEG
160 #define ECB_EXTERN_C_END
161 #endif
162
163 /*****************************************************************************/
164
165 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
166 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
167
168 #if ECB_NO_THREADS
169 #define ECB_NO_SMP 1
170 #endif
171
172 #if ECB_NO_SMP
173 #define ECB_MEMORY_FENCE do { } while (0)
174 #endif
175
176 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
177 #if __xlC__ && ECB_CPP
178 #include <builtins.h>
179 #endif
180
181 #if 1400 <= _MSC_VER
182 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
183 #endif
184
185 #ifndef ECB_MEMORY_FENCE
186 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
187 #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
188 #if __i386 || __i386__
189 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
190 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
191 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
192 #elif ECB_GCC_AMD64
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
194 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
195 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
196 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
197 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
198 #elif defined __ARM_ARCH_2__ \
199 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
200 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
201 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
202 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
203 || defined __ARM_ARCH_5TEJ__
204 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
205 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
206 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
207 || defined __ARM_ARCH_6T2__
208 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
209 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
210 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
211 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
212 #elif __aarch64__
213 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
214 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
215 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
216 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
217 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
218 #elif defined __s390__ || defined __s390x__
219 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
220 #elif defined __mips__
221 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
222 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
223 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
224 #elif defined __alpha__
225 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
226 #elif defined __hppa__
227 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
228 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
229 #elif defined __ia64__
230 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
231 #elif defined __m68k__
232 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
233 #elif defined __m88k__
234 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
235 #elif defined __sh__
236 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
237 #endif
238 #endif
239 #endif
240
241 #ifndef ECB_MEMORY_FENCE
242 #if ECB_GCC_VERSION(4,7)
243 /* see comment below (stdatomic.h) about the C11 memory model. */
244 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
245 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
246 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
247 #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
248
249 #elif ECB_CLANG_EXTENSION(c_atomic)
250 /* see comment below (stdatomic.h) about the C11 memory model. */
251 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
252 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
253 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
254 #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
255
256 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
257 #define ECB_MEMORY_FENCE __sync_synchronize ()
258 #elif _MSC_VER >= 1500 /* VC++ 2008 */
259 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
260 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
261 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
262 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
263 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
264 #elif _MSC_VER >= 1400 /* VC++ 2005 */
265 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
266 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
267 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
268 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
269 #elif defined _WIN32
270 #include <WinNT.h>
271 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
272 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
273 #include <mbarrier.h>
274 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
275 #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
276 #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
277 #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
278 #elif __xlC__
279 #define ECB_MEMORY_FENCE __sync ()
280 #endif
281 #endif
282
283 #ifndef ECB_MEMORY_FENCE
284 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
285 /* we assume that these memory fences work on all variables/all memory accesses, */
286 /* not just C11 atomics and atomic accesses */
287 #include <stdatomic.h>
288 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
289 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
290 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
291 #endif
292 #endif
293
294 #ifndef ECB_MEMORY_FENCE
295 #if !ECB_AVOID_PTHREADS
296 /*
297 * if you get undefined symbol references to pthread_mutex_lock,
298 * or failure to find pthread.h, then you should implement
299 * the ECB_MEMORY_FENCE operations for your cpu/compiler
300 * OR provide pthread.h and link against the posix thread library
301 * of your system.
302 */
303 #include <pthread.h>
304 #define ECB_NEEDS_PTHREADS 1
305 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
306
307 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
308 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
309 #endif
310 #endif
311
312 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
313 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
314 #endif
315
316 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
317 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
318 #endif
319
320 #if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
321 #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
322 #endif
323
324 /*****************************************************************************/
325
326 #if ECB_CPP
327 #define ecb_inline static inline
328 #elif ECB_GCC_VERSION(2,5)
329 #define ecb_inline static __inline__
330 #elif ECB_C99
331 #define ecb_inline static inline
332 #else
333 #define ecb_inline static
334 #endif
335
336 #if ECB_GCC_VERSION(3,3)
337 #define ecb_restrict __restrict__
338 #elif ECB_C99
339 #define ecb_restrict restrict
340 #else
341 #define ecb_restrict
342 #endif
343
344 typedef int ecb_bool;
345
346 #define ECB_CONCAT_(a, b) a ## b
347 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
348 #define ECB_STRINGIFY_(a) # a
349 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
350 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
351
352 #define ecb_function_ ecb_inline
353
354 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
355 #define ecb_attribute(attrlist) __attribute__ (attrlist)
356 #else
357 #define ecb_attribute(attrlist)
358 #endif
359
360 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
361 #define ecb_is_constant(expr) __builtin_constant_p (expr)
362 #else
363 /* possible C11 impl for integral types
364 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
365 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
366
367 #define ecb_is_constant(expr) 0
368 #endif
369
370 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
371 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
372 #else
373 #define ecb_expect(expr,value) (expr)
374 #endif
375
376 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
377 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
378 #else
379 #define ecb_prefetch(addr,rw,locality)
380 #endif
381
382 /* no emulation for ecb_decltype */
383 #if ECB_CPP11
384 // older implementations might have problems with decltype(x)::type, work around it
385 template<class T> struct ecb_decltype_t { typedef T type; };
386 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
387 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
388 #define ecb_decltype(x) __typeof__ (x)
389 #endif
390
391 #if _MSC_VER >= 1300
392 #define ecb_deprecated __declspec (deprecated)
393 #else
394 #define ecb_deprecated ecb_attribute ((__deprecated__))
395 #endif
396
397 #if _MSC_VER >= 1500
398 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
399 #elif ECB_GCC_VERSION(4,5)
400 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
401 #else
402 #define ecb_deprecated_message(msg) ecb_deprecated
403 #endif
404
405 #if _MSC_VER >= 1400
406 #define ecb_noinline __declspec (noinline)
407 #else
408 #define ecb_noinline ecb_attribute ((__noinline__))
409 #endif
410
411 #define ecb_unused ecb_attribute ((__unused__))
412 #define ecb_const ecb_attribute ((__const__))
413 #define ecb_pure ecb_attribute ((__pure__))
414
415 #if ECB_C11 || __IBMC_NORETURN
416 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
417 #define ecb_noreturn _Noreturn
418 #elif ECB_CPP11
419 #define ecb_noreturn [[noreturn]]
420 #elif _MSC_VER >= 1200
421 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
422 #define ecb_noreturn __declspec (noreturn)
423 #else
424 #define ecb_noreturn ecb_attribute ((__noreturn__))
425 #endif
426
427 #if ECB_GCC_VERSION(4,3)
428 #define ecb_artificial ecb_attribute ((__artificial__))
429 #define ecb_hot ecb_attribute ((__hot__))
430 #define ecb_cold ecb_attribute ((__cold__))
431 #else
432 #define ecb_artificial
433 #define ecb_hot
434 #define ecb_cold
435 #endif
436
437 /* put around conditional expressions if you are very sure that the */
438 /* expression is mostly true or mostly false. note that these return */
439 /* booleans, not the expression. */
440 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
441 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
442 /* for compatibility to the rest of the world */
443 #define ecb_likely(expr) ecb_expect_true (expr)
444 #define ecb_unlikely(expr) ecb_expect_false (expr)
445
446 /* count trailing zero bits and count # of one bits */
447 #if ECB_GCC_VERSION(3,4) \
448 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
449 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
450 && ECB_CLANG_BUILTIN(__builtin_popcount))
451 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
452 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
453 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
454 #define ecb_ctz32(x) __builtin_ctz (x)
455 #define ecb_ctz64(x) __builtin_ctzll (x)
456 #define ecb_popcount32(x) __builtin_popcount (x)
457 /* no popcountll */
458 #else
459 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
460 ecb_function_ ecb_const int
461 ecb_ctz32 (uint32_t x)
462 {
463 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
464 unsigned long r;
465 _BitScanForward (&r, x);
466 return (int)r;
467 #else
468 int r = 0;
469
470 x &= ~x + 1; /* this isolates the lowest bit */
471
472 #if ECB_branchless_on_i386
473 r += !!(x & 0xaaaaaaaa) << 0;
474 r += !!(x & 0xcccccccc) << 1;
475 r += !!(x & 0xf0f0f0f0) << 2;
476 r += !!(x & 0xff00ff00) << 3;
477 r += !!(x & 0xffff0000) << 4;
478 #else
479 if (x & 0xaaaaaaaa) r += 1;
480 if (x & 0xcccccccc) r += 2;
481 if (x & 0xf0f0f0f0) r += 4;
482 if (x & 0xff00ff00) r += 8;
483 if (x & 0xffff0000) r += 16;
484 #endif
485
486 return r;
487 #endif
488 }
489
490 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
491 ecb_function_ ecb_const int
492 ecb_ctz64 (uint64_t x)
493 {
494 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
495 unsigned long r;
496 _BitScanForward64 (&r, x);
497 return (int)r;
498 #else
499 int shift = x & 0xffffffff ? 0 : 32;
500 return ecb_ctz32 (x >> shift) + shift;
501 #endif
502 }
503
504 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
505 ecb_function_ ecb_const int
506 ecb_popcount32 (uint32_t x)
507 {
508 x -= (x >> 1) & 0x55555555;
509 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
510 x = ((x >> 4) + x) & 0x0f0f0f0f;
511 x *= 0x01010101;
512
513 return x >> 24;
514 }
515
516 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
517 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
518 {
519 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
520 unsigned long r;
521 _BitScanReverse (&r, x);
522 return (int)r;
523 #else
524 int r = 0;
525
526 if (x >> 16) { x >>= 16; r += 16; }
527 if (x >> 8) { x >>= 8; r += 8; }
528 if (x >> 4) { x >>= 4; r += 4; }
529 if (x >> 2) { x >>= 2; r += 2; }
530 if (x >> 1) { r += 1; }
531
532 return r;
533 #endif
534 }
535
536 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
537 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
538 {
539 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
540 unsigned long r;
541 _BitScanReverse64 (&r, x);
542 return (int)r;
543 #else
544 int r = 0;
545
546 if (x >> 32) { x >>= 32; r += 32; }
547
548 return r + ecb_ld32 (x);
549 #endif
550 }
551 #endif
552
553 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
554 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
555 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
556 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
557
558 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
559 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
560 {
561 return ( (x * 0x0802U & 0x22110U)
562 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
563 }
564
565 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
566 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
567 {
568 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
569 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
570 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
571 x = ( x >> 8 ) | ( x << 8);
572
573 return x;
574 }
575
576 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
577 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
578 {
579 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
580 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
581 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
582 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
583 x = ( x >> 16 ) | ( x << 16);
584
585 return x;
586 }
587
588 /* popcount64 is only available on 64 bit cpus as gcc builtin */
589 /* so for this version we are lazy */
590 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
591 ecb_function_ ecb_const int
592 ecb_popcount64 (uint64_t x)
593 {
594 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
595 }
596
597 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
598 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
599 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
600 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
601 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
602 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
603 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
604 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
605
606 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
607 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
608 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
609 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
610 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
611 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
612 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
613 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
614
615 #if ECB_CPP
616
617 inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
618 inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
619 inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
620 inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
621
622 inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
623 inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
624 inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
625 inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
626
627 inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
628 inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
629 inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
630 inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
631
632 inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
633 inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
634 inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
635 inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
636
637 inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
638 inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
639 inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
640
641 inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
642 inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
643 inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
644 inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
645
646 inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
647 inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
648 inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
649 inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
650
651 #endif
652
653 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
654 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
655 #define ecb_bswap16(x) __builtin_bswap16 (x)
656 #else
657 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
658 #endif
659 #define ecb_bswap32(x) __builtin_bswap32 (x)
660 #define ecb_bswap64(x) __builtin_bswap64 (x)
661 #elif _MSC_VER
662 #include <stdlib.h>
663 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
664 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
665 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
666 #else
667 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
668 ecb_function_ ecb_const uint16_t
669 ecb_bswap16 (uint16_t x)
670 {
671 return ecb_rotl16 (x, 8);
672 }
673
674 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
675 ecb_function_ ecb_const uint32_t
676 ecb_bswap32 (uint32_t x)
677 {
678 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
679 }
680
681 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
682 ecb_function_ ecb_const uint64_t
683 ecb_bswap64 (uint64_t x)
684 {
685 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
686 }
687 #endif
688
689 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
690 #define ecb_unreachable() __builtin_unreachable ()
691 #else
692 /* this seems to work fine, but gcc always emits a warning for it :/ */
693 ecb_inline ecb_noreturn void ecb_unreachable (void);
694 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
695 #endif
696
697 /* try to tell the compiler that some condition is definitely true */
698 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
699
700 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
701 ecb_inline ecb_const uint32_t
702 ecb_byteorder_helper (void)
703 {
704 /* the union code still generates code under pressure in gcc, */
705 /* but less than using pointers, and always seems to */
706 /* successfully return a constant. */
707 /* the reason why we have this horrible preprocessor mess */
708 /* is to avoid it in all cases, at least on common architectures */
709 /* or when using a recent enough gcc version (>= 4.6) */
710 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
711 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
712 #define ECB_LITTLE_ENDIAN 1
713 return 0x44332211;
714 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
715 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
716 #define ECB_BIG_ENDIAN 1
717 return 0x11223344;
718 #else
719 union
720 {
721 uint8_t c[4];
722 uint32_t u;
723 } u = { 0x11, 0x22, 0x33, 0x44 };
724 return u.u;
725 #endif
726 }
727
728 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
729 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
730 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
731 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
732
733 /*****************************************************************************/
734 /* unaligned load/store */
735
736 ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
737 ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
738 ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
739
740 ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
741 ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
742 ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
743
744 ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
745 ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
746 ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
747
748 ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
749 ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
750 ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
751
752 ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
753 ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
754 ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
755
756 ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
757 ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
758 ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
759
760 ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
761 ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
762 ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
763
764 ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
765 ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
766 ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
767
768 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)); }
769 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)); }
770 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)); }
771
772 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)); }
773 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)); }
774 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)); }
775
776 #if ECB_CPP
777
778 inline uint8_t ecb_bswap (uint8_t v) { return v; }
779 inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
780 inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
781 inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
782
783 template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
784 template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
785 template<typename T> inline T ecb_peek (const void *ptr) { return *(const T *)ptr; }
786 template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
787 template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
788 template<typename T> inline T ecb_peek_u (const void *ptr) { T v; memcpy (&v, ptr, sizeof (v)); return v; }
789 template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
790 template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
791
792 template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
793 template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
794 template<typename T> inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; }
795 template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
796 template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
797 template<typename T> inline void ecb_poke_u (void *ptr, T v) { memcpy (ptr, &v, sizeof (v)); }
798 template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
799 template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
800
801 #endif
802
803 /*****************************************************************************/
804 /* division */
805
806 #if ECB_GCC_VERSION(3,0) || ECB_C99
807 /* C99 tightened the definition of %, so we can use a more efficient version */
808 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
809 #else
810 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
811 #endif
812
813 #if ECB_CPP
814 template<typename T>
815 static inline T ecb_div_rd (T val, T div)
816 {
817 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
818 }
819 template<typename T>
820 static inline T ecb_div_ru (T val, T div)
821 {
822 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
823 }
824 #else
825 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
826 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
827 #endif
828
829 /*****************************************************************************/
830 /* array length */
831
832 #if ecb_cplusplus_does_not_suck
833 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
834 template<typename T, int N>
835 static inline int ecb_array_length (const T (&arr)[N])
836 {
837 return N;
838 }
839 #else
840 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
841 #endif
842
843 /*****************************************************************************/
844 /* IEEE 754-2008 half float conversions */
845
846 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
847 ecb_function_ ecb_const uint32_t
848 ecb_binary16_to_binary32 (uint32_t x)
849 {
850 unsigned int s = (x & 0x8000) << (31 - 15);
851 int e = (x >> 10) & 0x001f;
852 unsigned int m = x & 0x03ff;
853
854 if (ecb_expect_false (e == 31))
855 /* infinity or NaN */
856 e = 255 - (127 - 15);
857 else if (ecb_expect_false (!e))
858 {
859 if (ecb_expect_true (!m))
860 /* zero, handled by code below by forcing e to 0 */
861 e = 0 - (127 - 15);
862 else
863 {
864 /* subnormal, renormalise */
865 unsigned int s = 10 - ecb_ld32 (m);
866
867 m = (m << s) & 0x3ff; /* mask implicit bit */
868 e -= s - 1;
869 }
870 }
871
872 /* e and m now are normalised, or zero, (or inf or nan) */
873 e += 127 - 15;
874
875 return s | (e << 23) | (m << (23 - 10));
876 }
877
878 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
879 ecb_function_ ecb_const uint16_t
880 ecb_binary32_to_binary16 (uint32_t x)
881 {
882 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
883 int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
884 unsigned int m = x & 0x007fffff;
885
886 x &= 0x7fffffff;
887
888 /* if it's within range of binary16 normals, use fast path */
889 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
890 {
891 /* mantissa round-to-even */
892 m += 0x00000fff + ((m >> (23 - 10)) & 1);
893
894 /* handle overflow */
895 if (ecb_expect_false (m >= 0x00800000))
896 {
897 m >>= 1;
898 e += 1;
899 }
900
901 return s | (e << 10) | (m >> (23 - 10));
902 }
903
904 /* handle large numbers and infinity */
905 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
906 return s | 0x7c00;
907
908 /* handle zero, subnormals and small numbers */
909 if (ecb_expect_true (x < 0x38800000))
910 {
911 /* zero */
912 if (ecb_expect_true (!x))
913 return s;
914
915 /* handle subnormals */
916
917 /* too small, will be zero */
918 if (e < (14 - 24)) /* might not be sharp, but is good enough */
919 return s;
920
921 m |= 0x00800000; /* make implicit bit explicit */
922
923 /* very tricky - we need to round to the nearest e (+10) bit value */
924 {
925 unsigned int bits = 14 - e;
926 unsigned int half = (1 << (bits - 1)) - 1;
927 unsigned int even = (m >> bits) & 1;
928
929 /* if this overflows, we will end up with a normalised number */
930 m = (m + half + even) >> bits;
931 }
932
933 return s | m;
934 }
935
936 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
937 m >>= 13;
938
939 return s | 0x7c00 | m | !m;
940 }
941
942 /*******************************************************************************/
943 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
944
945 /* basically, everything uses "ieee pure-endian" floating point numbers */
946 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
947 #if 0 \
948 || __i386 || __i386__ \
949 || ECB_GCC_AMD64 \
950 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
951 || defined __s390__ || defined __s390x__ \
952 || defined __mips__ \
953 || defined __alpha__ \
954 || defined __hppa__ \
955 || defined __ia64__ \
956 || defined __m68k__ \
957 || defined __m88k__ \
958 || defined __sh__ \
959 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
960 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
961 || defined __aarch64__
962 #define ECB_STDFP 1
963 #else
964 #define ECB_STDFP 0
965 #endif
966
967 #ifndef ECB_NO_LIBM
968
969 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
970
971 /* only the oldest of old doesn't have this one. solaris. */
972 #ifdef INFINITY
973 #define ECB_INFINITY INFINITY
974 #else
975 #define ECB_INFINITY HUGE_VAL
976 #endif
977
978 #ifdef NAN
979 #define ECB_NAN NAN
980 #else
981 #define ECB_NAN ECB_INFINITY
982 #endif
983
984 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
985 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
986 #define ecb_frexpf(x,e) frexpf ((x), (e))
987 #else
988 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
989 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
990 #endif
991
992 /* convert a float to ieee single/binary32 */
993 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
994 ecb_function_ ecb_const uint32_t
995 ecb_float_to_binary32 (float x)
996 {
997 uint32_t r;
998
999 #if ECB_STDFP
1000 memcpy (&r, &x, 4);
1001 #else
1002 /* slow emulation, works for anything but -0 */
1003 uint32_t m;
1004 int e;
1005
1006 if (x == 0e0f ) return 0x00000000U;
1007 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1008 if (x < -3.40282346638528860e+38f) return 0xff800000U;
1009 if (x != x ) return 0x7fbfffffU;
1010
1011 m = ecb_frexpf (x, &e) * 0x1000000U;
1012
1013 r = m & 0x80000000U;
1014
1015 if (r)
1016 m = -m;
1017
1018 if (e <= -126)
1019 {
1020 m &= 0xffffffU;
1021 m >>= (-125 - e);
1022 e = -126;
1023 }
1024
1025 r |= (e + 126) << 23;
1026 r |= m & 0x7fffffU;
1027 #endif
1028
1029 return r;
1030 }
1031
1032 /* converts an ieee single/binary32 to a float */
1033 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1034 ecb_function_ ecb_const float
1035 ecb_binary32_to_float (uint32_t x)
1036 {
1037 float r;
1038
1039 #if ECB_STDFP
1040 memcpy (&r, &x, 4);
1041 #else
1042 /* emulation, only works for normals and subnormals and +0 */
1043 int neg = x >> 31;
1044 int e = (x >> 23) & 0xffU;
1045
1046 x &= 0x7fffffU;
1047
1048 if (e)
1049 x |= 0x800000U;
1050 else
1051 e = 1;
1052
1053 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1054 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1055
1056 r = neg ? -r : r;
1057 #endif
1058
1059 return r;
1060 }
1061
1062 /* convert a double to ieee double/binary64 */
1063 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1064 ecb_function_ ecb_const uint64_t
1065 ecb_double_to_binary64 (double x)
1066 {
1067 uint64_t r;
1068
1069 #if ECB_STDFP
1070 memcpy (&r, &x, 8);
1071 #else
1072 /* slow emulation, works for anything but -0 */
1073 uint64_t m;
1074 int e;
1075
1076 if (x == 0e0 ) return 0x0000000000000000U;
1077 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1078 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1079 if (x != x ) return 0X7ff7ffffffffffffU;
1080
1081 m = frexp (x, &e) * 0x20000000000000U;
1082
1083 r = m & 0x8000000000000000;;
1084
1085 if (r)
1086 m = -m;
1087
1088 if (e <= -1022)
1089 {
1090 m &= 0x1fffffffffffffU;
1091 m >>= (-1021 - e);
1092 e = -1022;
1093 }
1094
1095 r |= ((uint64_t)(e + 1022)) << 52;
1096 r |= m & 0xfffffffffffffU;
1097 #endif
1098
1099 return r;
1100 }
1101
1102 /* converts an ieee double/binary64 to a double */
1103 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1104 ecb_function_ ecb_const double
1105 ecb_binary64_to_double (uint64_t x)
1106 {
1107 double r;
1108
1109 #if ECB_STDFP
1110 memcpy (&r, &x, 8);
1111 #else
1112 /* emulation, only works for normals and subnormals and +0 */
1113 int neg = x >> 63;
1114 int e = (x >> 52) & 0x7ffU;
1115
1116 x &= 0xfffffffffffffU;
1117
1118 if (e)
1119 x |= 0x10000000000000U;
1120 else
1121 e = 1;
1122
1123 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1124 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1125
1126 r = neg ? -r : r;
1127 #endif
1128
1129 return r;
1130 }
1131
1132 /* convert a float to ieee half/binary16 */
1133 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1134 ecb_function_ ecb_const uint16_t
1135 ecb_float_to_binary16 (float x)
1136 {
1137 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1138 }
1139
1140 /* convert an ieee half/binary16 to float */
1141 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1142 ecb_function_ ecb_const float
1143 ecb_binary16_to_float (uint16_t x)
1144 {
1145 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1146 }
1147
1148 #endif
1149
1150 #endif
1151