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Revision: 1.170
Committed: Sat Nov 21 21:14:55 2015 UTC (8 years, 6 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 UINTMAX_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 #ifndef ECB_MEMORY_FENCE
161 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
162 #if __i386 || __i386__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
164 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
165 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
166 #elif ECB_GCC_AMD64
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
168 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
169 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
170 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
172 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
173 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
174 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
175 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
176 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
178 #elif __aarch64__
179 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
180 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
182 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
183 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
184 #elif defined __s390__ || defined __s390x__
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
186 #elif defined __mips__
187 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
188 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
189 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
190 #elif defined __alpha__
191 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
192 #elif defined __hppa__
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
194 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
195 #elif defined __ia64__
196 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
197 #elif defined __m68k__
198 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
199 #elif defined __m88k__
200 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
201 #elif defined __sh__
202 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
203 #endif
204 #endif
205 #endif
206
207 #ifndef ECB_MEMORY_FENCE
208 #if ECB_GCC_VERSION(4,7)
209 /* see comment below (stdatomic.h) about the C11 memory model. */
210 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
211 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
212 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
213
214 #elif ECB_CLANG_EXTENSION(c_atomic)
215 /* see comment below (stdatomic.h) about the C11 memory model. */
216 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
217 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
218 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
219
220 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
221 #define ECB_MEMORY_FENCE __sync_synchronize ()
222 #elif _MSC_VER >= 1500 /* VC++ 2008 */
223 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
224 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
225 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
226 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
227 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
228 #elif _MSC_VER >= 1400 /* VC++ 2005 */
229 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
230 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
232 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
233 #elif defined _WIN32
234 #include <WinNT.h>
235 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
236 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
237 #include <mbarrier.h>
238 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
239 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
240 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
241 #elif __xlC__
242 #define ECB_MEMORY_FENCE __sync ()
243 #endif
244 #endif
245
246 #ifndef ECB_MEMORY_FENCE
247 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
248 /* we assume that these memory fences work on all variables/all memory accesses, */
249 /* not just C11 atomics and atomic accesses */
250 #include <stdatomic.h>
251 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
252 /* any fence other than seq_cst, which isn't very efficient for us. */
253 /* Why that is, we don't know - either the C11 memory model is quite useless */
254 /* for most usages, or gcc and clang have a bug */
255 /* I *currently* lean towards the latter, and inefficiently implement */
256 /* all three of ecb's fences as a seq_cst fence */
257 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
258 /* for all __atomic_thread_fence's except seq_cst */
259 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
260 #endif
261 #endif
262
263 #ifndef ECB_MEMORY_FENCE
264 #if !ECB_AVOID_PTHREADS
265 /*
266 * if you get undefined symbol references to pthread_mutex_lock,
267 * or failure to find pthread.h, then you should implement
268 * the ECB_MEMORY_FENCE operations for your cpu/compiler
269 * OR provide pthread.h and link against the posix thread library
270 * of your system.
271 */
272 #include <pthread.h>
273 #define ECB_NEEDS_PTHREADS 1
274 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
275
276 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
277 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
278 #endif
279 #endif
280
281 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
282 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
283 #endif
284
285 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
286 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
287 #endif
288
289 /*****************************************************************************/
290
291 #if ECB_CPP
292 #define ecb_inline static inline
293 #elif ECB_GCC_VERSION(2,5)
294 #define ecb_inline static __inline__
295 #elif ECB_C99
296 #define ecb_inline static inline
297 #else
298 #define ecb_inline static
299 #endif
300
301 #if ECB_GCC_VERSION(3,3)
302 #define ecb_restrict __restrict__
303 #elif ECB_C99
304 #define ecb_restrict restrict
305 #else
306 #define ecb_restrict
307 #endif
308
309 typedef int ecb_bool;
310
311 #define ECB_CONCAT_(a, b) a ## b
312 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
313 #define ECB_STRINGIFY_(a) # a
314 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
315 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
316
317 #define ecb_function_ ecb_inline
318
319 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
320 #define ecb_attribute(attrlist) __attribute__ (attrlist)
321 #else
322 #define ecb_attribute(attrlist)
323 #endif
324
325 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
326 #define ecb_is_constant(expr) __builtin_constant_p (expr)
327 #else
328 /* possible C11 impl for integral types
329 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
330 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
331
332 #define ecb_is_constant(expr) 0
333 #endif
334
335 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
336 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
337 #else
338 #define ecb_expect(expr,value) (expr)
339 #endif
340
341 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
342 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
343 #else
344 #define ecb_prefetch(addr,rw,locality)
345 #endif
346
347 /* no emulation for ecb_decltype */
348 #if ECB_CPP11
349 // older implementations might have problems with decltype(x)::type, work around it
350 template<class T> struct ecb_decltype_t { typedef T type; };
351 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
352 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
353 #define ecb_decltype(x) __typeof__ (x)
354 #endif
355
356 #if _MSC_VER >= 1300
357 #define ecb_deprecated __declspec (deprecated)
358 #else
359 #define ecb_deprecated ecb_attribute ((__deprecated__))
360 #endif
361
362 #if _MSC_VER >= 1500
363 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
364 #elif ECB_GCC_VERSION(4,5)
365 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
366 #else
367 #define ecb_deprecated_message(msg) ecb_deprecated
368 #endif
369
370 #if _MSC_VER >= 1400
371 #define ecb_noinline __declspec (noinline)
372 #else
373 #define ecb_noinline ecb_attribute ((__noinline__))
374 #endif
375
376 #define ecb_unused ecb_attribute ((__unused__))
377 #define ecb_const ecb_attribute ((__const__))
378 #define ecb_pure ecb_attribute ((__pure__))
379
380 #if ECB_C11 || __IBMC_NORETURN
381 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
382 #define ecb_noreturn _Noreturn
383 #elif ECB_CPP11
384 #define ecb_noreturn [[noreturn]]
385 #elif _MSC_VER >= 1200
386 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
387 #define ecb_noreturn __declspec (noreturn)
388 #else
389 #define ecb_noreturn ecb_attribute ((__noreturn__))
390 #endif
391
392 #if ECB_GCC_VERSION(4,3)
393 #define ecb_artificial ecb_attribute ((__artificial__))
394 #define ecb_hot ecb_attribute ((__hot__))
395 #define ecb_cold ecb_attribute ((__cold__))
396 #else
397 #define ecb_artificial
398 #define ecb_hot
399 #define ecb_cold
400 #endif
401
402 /* put around conditional expressions if you are very sure that the */
403 /* expression is mostly true or mostly false. note that these return */
404 /* booleans, not the expression. */
405 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
406 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
407 /* for compatibility to the rest of the world */
408 #define ecb_likely(expr) ecb_expect_true (expr)
409 #define ecb_unlikely(expr) ecb_expect_false (expr)
410
411 /* count trailing zero bits and count # of one bits */
412 #if ECB_GCC_VERSION(3,4) \
413 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
414 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
415 && ECB_CLANG_BUILTIN(__builtin_popcount))
416 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
417 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
418 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
419 #define ecb_ctz32(x) __builtin_ctz (x)
420 #define ecb_ctz64(x) __builtin_ctzll (x)
421 #define ecb_popcount32(x) __builtin_popcount (x)
422 /* no popcountll */
423 #else
424 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
425 ecb_function_ ecb_const int
426 ecb_ctz32 (uint32_t x)
427 {
428 int r = 0;
429
430 x &= ~x + 1; /* this isolates the lowest bit */
431
432 #if ECB_branchless_on_i386
433 r += !!(x & 0xaaaaaaaa) << 0;
434 r += !!(x & 0xcccccccc) << 1;
435 r += !!(x & 0xf0f0f0f0) << 2;
436 r += !!(x & 0xff00ff00) << 3;
437 r += !!(x & 0xffff0000) << 4;
438 #else
439 if (x & 0xaaaaaaaa) r += 1;
440 if (x & 0xcccccccc) r += 2;
441 if (x & 0xf0f0f0f0) r += 4;
442 if (x & 0xff00ff00) r += 8;
443 if (x & 0xffff0000) r += 16;
444 #endif
445
446 return r;
447 }
448
449 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
450 ecb_function_ ecb_const int
451 ecb_ctz64 (uint64_t x)
452 {
453 int shift = x & 0xffffffff ? 0 : 32;
454 return ecb_ctz32 (x >> shift) + shift;
455 }
456
457 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
458 ecb_function_ ecb_const int
459 ecb_popcount32 (uint32_t x)
460 {
461 x -= (x >> 1) & 0x55555555;
462 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
463 x = ((x >> 4) + x) & 0x0f0f0f0f;
464 x *= 0x01010101;
465
466 return x >> 24;
467 }
468
469 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
470 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
471 {
472 int r = 0;
473
474 if (x >> 16) { x >>= 16; r += 16; }
475 if (x >> 8) { x >>= 8; r += 8; }
476 if (x >> 4) { x >>= 4; r += 4; }
477 if (x >> 2) { x >>= 2; r += 2; }
478 if (x >> 1) { r += 1; }
479
480 return r;
481 }
482
483 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
484 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
485 {
486 int r = 0;
487
488 if (x >> 32) { x >>= 32; r += 32; }
489
490 return r + ecb_ld32 (x);
491 }
492 #endif
493
494 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
495 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
496 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
497 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
498
499 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
500 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
501 {
502 return ( (x * 0x0802U & 0x22110U)
503 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
504 }
505
506 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
507 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
508 {
509 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
510 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
511 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
512 x = ( x >> 8 ) | ( x << 8);
513
514 return x;
515 }
516
517 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
518 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
519 {
520 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
521 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
522 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
523 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
524 x = ( x >> 16 ) | ( x << 16);
525
526 return x;
527 }
528
529 /* popcount64 is only available on 64 bit cpus as gcc builtin */
530 /* so for this version we are lazy */
531 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
532 ecb_function_ ecb_const int
533 ecb_popcount64 (uint64_t x)
534 {
535 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
536 }
537
538 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
539 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
540 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
541 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
542 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
543 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
544 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
545 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
546
547 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
548 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
549 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
550 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
551 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
552 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
553 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
554 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
555
556 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
557 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
558 #define ecb_bswap16(x) __builtin_bswap16 (x)
559 #else
560 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
561 #endif
562 #define ecb_bswap32(x) __builtin_bswap32 (x)
563 #define ecb_bswap64(x) __builtin_bswap64 (x)
564 #elif _MSC_VER
565 #include <stdlib.h>
566 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
567 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
568 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
569 #else
570 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
571 ecb_function_ ecb_const uint16_t
572 ecb_bswap16 (uint16_t x)
573 {
574 return ecb_rotl16 (x, 8);
575 }
576
577 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
578 ecb_function_ ecb_const uint32_t
579 ecb_bswap32 (uint32_t x)
580 {
581 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
582 }
583
584 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
585 ecb_function_ ecb_const uint64_t
586 ecb_bswap64 (uint64_t x)
587 {
588 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
589 }
590 #endif
591
592 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
593 #define ecb_unreachable() __builtin_unreachable ()
594 #else
595 /* this seems to work fine, but gcc always emits a warning for it :/ */
596 ecb_inline ecb_noreturn void ecb_unreachable (void);
597 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
598 #endif
599
600 /* try to tell the compiler that some condition is definitely true */
601 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
602
603 ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
604 ecb_inline ecb_const unsigned char
605 ecb_byteorder_helper (void)
606 {
607 /* the union code still generates code under pressure in gcc, */
608 /* but less than using pointers, and always seems to */
609 /* successfully return a constant. */
610 /* the reason why we have this horrible preprocessor mess */
611 /* is to avoid it in all cases, at least on common architectures */
612 /* or when using a recent enough gcc version (>= 4.6) */
613 #if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
614 return 0x44;
615 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
616 return 0x44;
617 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
618 return 0x11;
619 #else
620 union
621 {
622 uint32_t i;
623 uint8_t c;
624 } u = { 0x11223344 };
625 return u.c;
626 #endif
627 }
628
629 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
630 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
631 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
632 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
633
634 #if ECB_GCC_VERSION(3,0) || ECB_C99
635 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
636 #else
637 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
638 #endif
639
640 #if ECB_CPP
641 template<typename T>
642 static inline T ecb_div_rd (T val, T div)
643 {
644 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
645 }
646 template<typename T>
647 static inline T ecb_div_ru (T val, T div)
648 {
649 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
650 }
651 #else
652 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
653 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
654 #endif
655
656 #if ecb_cplusplus_does_not_suck
657 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
658 template<typename T, int N>
659 static inline int ecb_array_length (const T (&arr)[N])
660 {
661 return N;
662 }
663 #else
664 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
665 #endif
666
667 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
668 ecb_function_ ecb_const uint32_t
669 ecb_binary16_to_binary32 (uint32_t x)
670 {
671 unsigned int s = (x & 0x8000) << (31 - 15);
672 int e = (x >> 10) & 0x001f;
673 unsigned int m = x & 0x03ff;
674
675 if (ecb_expect_false (e == 31))
676 /* infinity or NaN */
677 e = 255 - (127 - 15);
678 else if (ecb_expect_false (!e))
679 {
680 if (ecb_expect_true (!m))
681 /* zero, handled by code below by forcing e to 0 */
682 e = 0 - (127 - 15);
683 else
684 {
685 /* subnormal, renormalise */
686 unsigned int s = 10 - ecb_ld32 (m);
687
688 m = (m << s) & 0x3ff; /* mask implicit bit */
689 e -= s - 1;
690 }
691 }
692
693 /* e and m now are normalised, or zero, (or inf or nan) */
694 e += 127 - 15;
695
696 return s | (e << 23) | (m << (23 - 10));
697 }
698
699 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
700 ecb_function_ ecb_const uint16_t
701 ecb_binary32_to_binary16 (uint32_t x)
702 {
703 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
704 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
705 unsigned int m = x & 0x007fffff;
706
707 x &= 0x7fffffff;
708
709 /* if it's within range of binary16 normals, use fast path */
710 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
711 {
712 /* mantissa round-to-even */
713 m += 0x00000fff + ((m >> (23 - 10)) & 1);
714
715 /* handle overflow */
716 if (ecb_expect_false (m >= 0x00800000))
717 {
718 m >>= 1;
719 e += 1;
720 }
721
722 return s | (e << 10) | (m >> (23 - 10));
723 }
724
725 /* handle large numbers and infinity */
726 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
727 return s | 0x7c00;
728
729 /* handle zero, subnormals and small numbers */
730 if (ecb_expect_true (x < 0x38800000))
731 {
732 /* zero */
733 if (ecb_expect_true (!x))
734 return s;
735
736 /* handle subnormals */
737
738 /* too small, will be zero */
739 if (e < (14 - 24)) /* might not be sharp, but is good enough */
740 return s;
741
742 m |= 0x00800000; /* make implicit bit explicit */
743
744 /* very tricky - we need to round to the nearest e (+10) bit value */
745 {
746 unsigned int bits = 14 - e;
747 unsigned int half = (1 << (bits - 1)) - 1;
748 unsigned int even = (m >> bits) & 1;
749
750 /* if this overflows, we will end up with a normalised number */
751 m = (m + half + even) >> bits;
752 }
753
754 return s | m;
755 }
756
757 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
758 m >>= 13;
759
760 return s | 0x7c00 | m | !m;
761 }
762
763 /*******************************************************************************/
764 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
765
766 /* basically, everything uses "ieee pure-endian" floating point numbers */
767 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
768 #if 0 \
769 || __i386 || __i386__ \
770 || ECB_GCC_AMD64 \
771 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
772 || defined __s390__ || defined __s390x__ \
773 || defined __mips__ \
774 || defined __alpha__ \
775 || defined __hppa__ \
776 || defined __ia64__ \
777 || defined __m68k__ \
778 || defined __m88k__ \
779 || defined __sh__ \
780 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
781 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
782 || defined __aarch64__
783 #define ECB_STDFP 1
784 #include <string.h> /* for memcpy */
785 #else
786 #define ECB_STDFP 0
787 #endif
788
789 #ifndef ECB_NO_LIBM
790
791 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
792
793 /* only the oldest of old doesn't have this one. solaris. */
794 #ifdef INFINITY
795 #define ECB_INFINITY INFINITY
796 #else
797 #define ECB_INFINITY HUGE_VAL
798 #endif
799
800 #ifdef NAN
801 #define ECB_NAN NAN
802 #else
803 #define ECB_NAN ECB_INFINITY
804 #endif
805
806 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
807 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
808 #define ecb_frexpf(x,e) frexpf ((x), (e))
809 #else
810 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
811 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
812 #endif
813
814 /* convert a float to ieee single/binary32 */
815 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
816 ecb_function_ ecb_const uint32_t
817 ecb_float_to_binary32 (float x)
818 {
819 uint32_t r;
820
821 #if ECB_STDFP
822 memcpy (&r, &x, 4);
823 #else
824 /* slow emulation, works for anything but -0 */
825 uint32_t m;
826 int e;
827
828 if (x == 0e0f ) return 0x00000000U;
829 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
830 if (x < -3.40282346638528860e+38f) return 0xff800000U;
831 if (x != x ) return 0x7fbfffffU;
832
833 m = ecb_frexpf (x, &e) * 0x1000000U;
834
835 r = m & 0x80000000U;
836
837 if (r)
838 m = -m;
839
840 if (e <= -126)
841 {
842 m &= 0xffffffU;
843 m >>= (-125 - e);
844 e = -126;
845 }
846
847 r |= (e + 126) << 23;
848 r |= m & 0x7fffffU;
849 #endif
850
851 return r;
852 }
853
854 /* converts an ieee single/binary32 to a float */
855 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
856 ecb_function_ ecb_const float
857 ecb_binary32_to_float (uint32_t x)
858 {
859 float r;
860
861 #if ECB_STDFP
862 memcpy (&r, &x, 4);
863 #else
864 /* emulation, only works for normals and subnormals and +0 */
865 int neg = x >> 31;
866 int e = (x >> 23) & 0xffU;
867
868 x &= 0x7fffffU;
869
870 if (e)
871 x |= 0x800000U;
872 else
873 e = 1;
874
875 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
876 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
877
878 r = neg ? -r : r;
879 #endif
880
881 return r;
882 }
883
884 /* convert a double to ieee double/binary64 */
885 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
886 ecb_function_ ecb_const uint64_t
887 ecb_double_to_binary64 (double x)
888 {
889 uint64_t r;
890
891 #if ECB_STDFP
892 memcpy (&r, &x, 8);
893 #else
894 /* slow emulation, works for anything but -0 */
895 uint64_t m;
896 int e;
897
898 if (x == 0e0 ) return 0x0000000000000000U;
899 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
900 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
901 if (x != x ) return 0X7ff7ffffffffffffU;
902
903 m = frexp (x, &e) * 0x20000000000000U;
904
905 r = m & 0x8000000000000000;;
906
907 if (r)
908 m = -m;
909
910 if (e <= -1022)
911 {
912 m &= 0x1fffffffffffffU;
913 m >>= (-1021 - e);
914 e = -1022;
915 }
916
917 r |= ((uint64_t)(e + 1022)) << 52;
918 r |= m & 0xfffffffffffffU;
919 #endif
920
921 return r;
922 }
923
924 /* converts an ieee double/binary64 to a double */
925 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
926 ecb_function_ ecb_const double
927 ecb_binary64_to_double (uint64_t x)
928 {
929 double r;
930
931 #if ECB_STDFP
932 memcpy (&r, &x, 8);
933 #else
934 /* emulation, only works for normals and subnormals and +0 */
935 int neg = x >> 63;
936 int e = (x >> 52) & 0x7ffU;
937
938 x &= 0xfffffffffffffU;
939
940 if (e)
941 x |= 0x10000000000000U;
942 else
943 e = 1;
944
945 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
946 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
947
948 r = neg ? -r : r;
949 #endif
950
951 return r;
952 }
953
954 /* convert a float to ieee half/binary16 */
955 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
956 ecb_function_ ecb_const uint16_t
957 ecb_float_to_binary16 (float x)
958 {
959 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
960 }
961
962 /* convert an ieee half/binary16 to float */
963 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
964 ecb_function_ ecb_const float
965 ecb_binary16_to_float (uint16_t x)
966 {
967 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
968 }
969
970 #endif
971
972 #endif
973