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Revision: 1.137
Committed: Tue Oct 14 14:01:07 2014 UTC (9 years, 8 months ago) by root
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Branch: MAIN
Changes since 1.136: +4 -6 lines
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2014 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 0x00010003
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 /* work around x32 idiocy by defining proper macros */
80 #if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
85 #endif
86 #endif
87
88 /* many compilers define _GNUC_ to some versions but then only implement
89 * what their idiot authors think are the "more important" extensions,
90 * causing enormous grief in return for some better fake benchmark numbers.
91 * or so.
92 * we try to detect these and simply assume they are not gcc - if they have
93 * an issue with that they should have done it right in the first place.
94 */
95 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
96 #define ECB_GCC_VERSION(major,minor) 0
97 #else
98 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
99 #endif
100
101 #define ECB_CPP (__cplusplus+0)
102 #define ECB_CPP11 (__cplusplus >= 201103L)
103
104 #if ECB_CPP
105 #define ECB_C 0
106 #define ECB_STDC_VERSION 0
107 #else
108 #define ECB_C 1
109 #define ECB_STDC_VERSION __STDC_VERSION__
110 #endif
111
112 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
113 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
114
115 #if ECB_CPP
116 #define ECB_EXTERN_C extern "C"
117 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
118 #define ECB_EXTERN_C_END }
119 #else
120 #define ECB_EXTERN_C extern
121 #define ECB_EXTERN_C_BEG
122 #define ECB_EXTERN_C_END
123 #endif
124
125 /*****************************************************************************/
126
127 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
128 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
129
130 #if ECB_NO_THREADS
131 #define ECB_NO_SMP 1
132 #endif
133
134 #if ECB_NO_SMP
135 #define ECB_MEMORY_FENCE do { } while (0)
136 #endif
137
138 #ifndef ECB_MEMORY_FENCE
139 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
140 #if __i386 || __i386__
141 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
142 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
143 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
144 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
145 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
146 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
147 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
148 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
149 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
150 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
151 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
153 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
154 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
156 #elif __aarch64__
157 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
158 #elif (__sparc || __sparc__) && !__sparcv8
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
160 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
162 #elif defined __s390__ || defined __s390x__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
164 #elif defined __mips__
165 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
166 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
168 #elif defined __alpha__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
170 #elif defined __hppa__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
172 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
173 #elif defined __ia64__
174 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
175 #elif defined __m68k__
176 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
177 #elif defined __m88k__
178 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
179 #elif defined __sh__
180 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
181 #endif
182 #endif
183 #endif
184
185 #ifndef ECB_MEMORY_FENCE
186 #if ECB_GCC_VERSION(4,7)
187 /* see comment below (stdatomic.h) about the C11 memory model. */
188 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
189 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
190 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
191
192 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
193 * without risking compile time errors with other compilers. We *could*
194 * define our own ecb_clang_has_feature, but I just can't be bothered to work
195 * around this shit time and again.
196 * #elif defined __clang && __has_feature (cxx_atomic)
197 * // see comment below (stdatomic.h) about the C11 memory model.
198 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
199 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
200 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
201 */
202
203 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
204 #define ECB_MEMORY_FENCE __sync_synchronize ()
205 #elif _MSC_VER >= 1500 /* VC++ 2008 */
206 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
207 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
208 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
209 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
210 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
211 #elif _MSC_VER >= 1400 /* VC++ 2005 */
212 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
213 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
214 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
215 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
216 #elif defined _WIN32
217 #include <WinNT.h>
218 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
219 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
220 #include <mbarrier.h>
221 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
222 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
223 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
224 #elif __xlC__
225 #define ECB_MEMORY_FENCE __sync ()
226 #endif
227 #endif
228
229 #ifndef ECB_MEMORY_FENCE
230 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
231 /* we assume that these memory fences work on all variables/all memory accesses, */
232 /* not just C11 atomics and atomic accesses */
233 #include <stdatomic.h>
234 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
235 /* any fence other than seq_cst, which isn't very efficient for us. */
236 /* Why that is, we don't know - either the C11 memory model is quite useless */
237 /* for most usages, or gcc and clang have a bug */
238 /* I *currently* lean towards the latter, and inefficiently implement */
239 /* all three of ecb's fences as a seq_cst fence */
240 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
241 /* for all __atomic_thread_fence's except seq_cst */
242 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
243 #endif
244 #endif
245
246 #ifndef ECB_MEMORY_FENCE
247 #if !ECB_AVOID_PTHREADS
248 /*
249 * if you get undefined symbol references to pthread_mutex_lock,
250 * or failure to find pthread.h, then you should implement
251 * the ECB_MEMORY_FENCE operations for your cpu/compiler
252 * OR provide pthread.h and link against the posix thread library
253 * of your system.
254 */
255 #include <pthread.h>
256 #define ECB_NEEDS_PTHREADS 1
257 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
258
259 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
260 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
261 #endif
262 #endif
263
264 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
265 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
266 #endif
267
268 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
269 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
270 #endif
271
272 /*****************************************************************************/
273
274 #if __cplusplus
275 #define ecb_inline static inline
276 #elif ECB_GCC_VERSION(2,5)
277 #define ecb_inline static __inline__
278 #elif ECB_C99
279 #define ecb_inline static inline
280 #else
281 #define ecb_inline static
282 #endif
283
284 #if ECB_GCC_VERSION(3,3)
285 #define ecb_restrict __restrict__
286 #elif ECB_C99
287 #define ecb_restrict restrict
288 #else
289 #define ecb_restrict
290 #endif
291
292 typedef int ecb_bool;
293
294 #define ECB_CONCAT_(a, b) a ## b
295 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
296 #define ECB_STRINGIFY_(a) # a
297 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
298
299 #define ecb_function_ ecb_inline
300
301 #if ECB_GCC_VERSION(3,1)
302 #define ecb_attribute(attrlist) __attribute__(attrlist)
303 #define ecb_is_constant(expr) __builtin_constant_p (expr)
304 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
305 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
306 #else
307 #define ecb_attribute(attrlist)
308
309 /* possible C11 impl for integral types
310 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
311 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
312
313 #define ecb_is_constant(expr) 0
314 #define ecb_expect(expr,value) (expr)
315 #define ecb_prefetch(addr,rw,locality)
316 #endif
317
318 /* no emulation for ecb_decltype */
319 #if ECB_GCC_VERSION(4,5)
320 #define ecb_decltype(x) __decltype(x)
321 #elif ECB_GCC_VERSION(3,0)
322 #define ecb_decltype(x) __typeof(x)
323 #endif
324
325 #if _MSC_VER >= 1300
326 #define ecb_deprecated __declspec(deprecated)
327 #else
328 #define ecb_deprecated ecb_attribute ((__deprecated__))
329 #endif
330
331 #define ecb_noinline ecb_attribute ((__noinline__))
332 #define ecb_unused ecb_attribute ((__unused__))
333 #define ecb_const ecb_attribute ((__const__))
334 #define ecb_pure ecb_attribute ((__pure__))
335
336 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
337 #if ECB_C11
338 #define ecb_noreturn _Noreturn
339 #else
340 #define ecb_noreturn ecb_attribute ((__noreturn__))
341 #endif
342
343 #if ECB_GCC_VERSION(4,3)
344 #define ecb_artificial ecb_attribute ((__artificial__))
345 #define ecb_hot ecb_attribute ((__hot__))
346 #define ecb_cold ecb_attribute ((__cold__))
347 #else
348 #define ecb_artificial
349 #define ecb_hot
350 #define ecb_cold
351 #endif
352
353 /* put around conditional expressions if you are very sure that the */
354 /* expression is mostly true or mostly false. note that these return */
355 /* booleans, not the expression. */
356 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
357 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
358 /* for compatibility to the rest of the world */
359 #define ecb_likely(expr) ecb_expect_true (expr)
360 #define ecb_unlikely(expr) ecb_expect_false (expr)
361
362 /* count trailing zero bits and count # of one bits */
363 #if ECB_GCC_VERSION(3,4)
364 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
365 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
366 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
367 #define ecb_ctz32(x) __builtin_ctz (x)
368 #define ecb_ctz64(x) __builtin_ctzll (x)
369 #define ecb_popcount32(x) __builtin_popcount (x)
370 /* no popcountll */
371 #else
372 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
373 ecb_function_ int
374 ecb_ctz32 (uint32_t x)
375 {
376 int r = 0;
377
378 x &= ~x + 1; /* this isolates the lowest bit */
379
380 #if ECB_branchless_on_i386
381 r += !!(x & 0xaaaaaaaa) << 0;
382 r += !!(x & 0xcccccccc) << 1;
383 r += !!(x & 0xf0f0f0f0) << 2;
384 r += !!(x & 0xff00ff00) << 3;
385 r += !!(x & 0xffff0000) << 4;
386 #else
387 if (x & 0xaaaaaaaa) r += 1;
388 if (x & 0xcccccccc) r += 2;
389 if (x & 0xf0f0f0f0) r += 4;
390 if (x & 0xff00ff00) r += 8;
391 if (x & 0xffff0000) r += 16;
392 #endif
393
394 return r;
395 }
396
397 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
398 ecb_function_ int
399 ecb_ctz64 (uint64_t x)
400 {
401 int shift = x & 0xffffffffU ? 0 : 32;
402 return ecb_ctz32 (x >> shift) + shift;
403 }
404
405 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
406 ecb_function_ int
407 ecb_popcount32 (uint32_t x)
408 {
409 x -= (x >> 1) & 0x55555555;
410 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
411 x = ((x >> 4) + x) & 0x0f0f0f0f;
412 x *= 0x01010101;
413
414 return x >> 24;
415 }
416
417 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
418 ecb_function_ int ecb_ld32 (uint32_t x)
419 {
420 int r = 0;
421
422 if (x >> 16) { x >>= 16; r += 16; }
423 if (x >> 8) { x >>= 8; r += 8; }
424 if (x >> 4) { x >>= 4; r += 4; }
425 if (x >> 2) { x >>= 2; r += 2; }
426 if (x >> 1) { r += 1; }
427
428 return r;
429 }
430
431 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
432 ecb_function_ int ecb_ld64 (uint64_t x)
433 {
434 int r = 0;
435
436 if (x >> 32) { x >>= 32; r += 32; }
437
438 return r + ecb_ld32 (x);
439 }
440 #endif
441
442 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
443 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
444 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
445 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
446
447 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
448 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
449 {
450 return ( (x * 0x0802U & 0x22110U)
451 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
452 }
453
454 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
455 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
456 {
457 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
458 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
459 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
460 x = ( x >> 8 ) | ( x << 8);
461
462 return x;
463 }
464
465 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
466 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
467 {
468 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
469 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
470 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
471 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
472 x = ( x >> 16 ) | ( x << 16);
473
474 return x;
475 }
476
477 /* popcount64 is only available on 64 bit cpus as gcc builtin */
478 /* so for this version we are lazy */
479 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
480 ecb_function_ int
481 ecb_popcount64 (uint64_t x)
482 {
483 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
484 }
485
486 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
487 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
488 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
489 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
490 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
491 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
492 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
493 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
494
495 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
496 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
497 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
498 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
499 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
500 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
501 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
502 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
503
504 #if ECB_GCC_VERSION(4,3)
505 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
506 #define ecb_bswap32(x) __builtin_bswap32 (x)
507 #define ecb_bswap64(x) __builtin_bswap64 (x)
508 #else
509 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
510 ecb_function_ uint16_t
511 ecb_bswap16 (uint16_t x)
512 {
513 return ecb_rotl16 (x, 8);
514 }
515
516 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
517 ecb_function_ uint32_t
518 ecb_bswap32 (uint32_t x)
519 {
520 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
521 }
522
523 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
524 ecb_function_ uint64_t
525 ecb_bswap64 (uint64_t x)
526 {
527 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
528 }
529 #endif
530
531 #if ECB_GCC_VERSION(4,5)
532 #define ecb_unreachable() __builtin_unreachable ()
533 #else
534 /* this seems to work fine, but gcc always emits a warning for it :/ */
535 ecb_inline void ecb_unreachable (void) ecb_noreturn;
536 ecb_inline void ecb_unreachable (void) { }
537 #endif
538
539 /* try to tell the compiler that some condition is definitely true */
540 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
541
542 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
543 ecb_inline unsigned char
544 ecb_byteorder_helper (void)
545 {
546 /* the union code still generates code under pressure in gcc, */
547 /* but less than using pointers, and always seems to */
548 /* successfully return a constant. */
549 /* the reason why we have this horrible preprocessor mess */
550 /* is to avoid it in all cases, at least on common architectures */
551 /* or when using a recent enough gcc version (>= 4.6) */
552 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
553 return 0x44;
554 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
555 return 0x44;
556 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
557 return 0x11;
558 #else
559 union
560 {
561 uint32_t i;
562 uint8_t c;
563 } u = { 0x11223344 };
564 return u.c;
565 #endif
566 }
567
568 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
569 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
570 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
571 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
572
573 #if ECB_GCC_VERSION(3,0) || ECB_C99
574 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
575 #else
576 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
577 #endif
578
579 #if __cplusplus
580 template<typename T>
581 static inline T ecb_div_rd (T val, T div)
582 {
583 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
584 }
585 template<typename T>
586 static inline T ecb_div_ru (T val, T div)
587 {
588 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
589 }
590 #else
591 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
592 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
593 #endif
594
595 #if ecb_cplusplus_does_not_suck
596 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
597 template<typename T, int N>
598 static inline int ecb_array_length (const T (&arr)[N])
599 {
600 return N;
601 }
602 #else
603 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
604 #endif
605
606 /*******************************************************************************/
607 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
608
609 /* basically, everything uses "ieee pure-endian" floating point numbers */
610 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
611 #if 0 \
612 || __i386 || __i386__ \
613 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
614 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
615 || defined __s390__ || defined __s390x__ \
616 || defined __mips__ \
617 || defined __alpha__ \
618 || defined __hppa__ \
619 || defined __ia64__ \
620 || defined __m68k__ \
621 || defined __m88k__ \
622 || defined __sh__ \
623 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
624 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
625 || defined __aarch64__
626 #define ECB_STDFP 1
627 #include <string.h> /* for memcpy */
628 #else
629 #define ECB_STDFP 0
630 #endif
631
632 #ifndef ECB_NO_LIBM
633
634 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
635
636 /* only the oldest of old doesn't have this one. solaris. */
637 #ifdef INFINITY
638 #define ECB_INFINITY INFINITY
639 #else
640 #define ECB_INFINITY HUGE_VAL
641 #endif
642
643 #ifdef NAN
644 #define ECB_NAN NAN
645 #else
646 #define ECB_NAN ECB_INFINITY
647 #endif
648
649 /* converts an ieee half/binary16 to a float */
650 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
651 ecb_function_ float
652 ecb_binary16_to_float (uint16_t x)
653 {
654 int e = (x >> 10) & 0x1f;
655 int m = x & 0x3ff;
656 float r;
657
658 if (!e ) r = ldexpf (m , -24);
659 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
660 else if (m ) r = ECB_NAN;
661 else r = ECB_INFINITY;
662
663 return x & 0x8000 ? -r : r;
664 }
665
666 /* convert a float to ieee single/binary32 */
667 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
668 ecb_function_ uint32_t
669 ecb_float_to_binary32 (float x)
670 {
671 uint32_t r;
672
673 #if ECB_STDFP
674 memcpy (&r, &x, 4);
675 #else
676 /* slow emulation, works for anything but -0 */
677 uint32_t m;
678 int e;
679
680 if (x == 0e0f ) return 0x00000000U;
681 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
682 if (x < -3.40282346638528860e+38f) return 0xff800000U;
683 if (x != x ) return 0x7fbfffffU;
684
685 m = frexpf (x, &e) * 0x1000000U;
686
687 r = m & 0x80000000U;
688
689 if (r)
690 m = -m;
691
692 if (e <= -126)
693 {
694 m &= 0xffffffU;
695 m >>= (-125 - e);
696 e = -126;
697 }
698
699 r |= (e + 126) << 23;
700 r |= m & 0x7fffffU;
701 #endif
702
703 return r;
704 }
705
706 /* converts an ieee single/binary32 to a float */
707 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
708 ecb_function_ float
709 ecb_binary32_to_float (uint32_t x)
710 {
711 float r;
712
713 #if ECB_STDFP
714 memcpy (&r, &x, 4);
715 #else
716 /* emulation, only works for normals and subnormals and +0 */
717 int neg = x >> 31;
718 int e = (x >> 23) & 0xffU;
719
720 x &= 0x7fffffU;
721
722 if (e)
723 x |= 0x800000U;
724 else
725 e = 1;
726
727 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
728 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
729
730 r = neg ? -r : r;
731 #endif
732
733 return r;
734 }
735
736 /* convert a double to ieee double/binary64 */
737 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
738 ecb_function_ uint64_t
739 ecb_double_to_binary64 (double x)
740 {
741 uint64_t r;
742
743 #if ECB_STDFP
744 memcpy (&r, &x, 8);
745 #else
746 /* slow emulation, works for anything but -0 */
747 uint64_t m;
748 int e;
749
750 if (x == 0e0 ) return 0x0000000000000000U;
751 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
752 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
753 if (x != x ) return 0X7ff7ffffffffffffU;
754
755 m = frexp (x, &e) * 0x20000000000000U;
756
757 r = m & 0x8000000000000000;;
758
759 if (r)
760 m = -m;
761
762 if (e <= -1022)
763 {
764 m &= 0x1fffffffffffffU;
765 m >>= (-1021 - e);
766 e = -1022;
767 }
768
769 r |= ((uint64_t)(e + 1022)) << 52;
770 r |= m & 0xfffffffffffffU;
771 #endif
772
773 return r;
774 }
775
776 /* converts an ieee double/binary64 to a double */
777 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
778 ecb_function_ double
779 ecb_binary64_to_double (uint64_t x)
780 {
781 double r;
782
783 #if ECB_STDFP
784 memcpy (&r, &x, 8);
785 #else
786 /* emulation, only works for normals and subnormals and +0 */
787 int neg = x >> 63;
788 int e = (x >> 52) & 0x7ffU;
789
790 x &= 0xfffffffffffffU;
791
792 if (e)
793 x |= 0x10000000000000U;
794 else
795 e = 1;
796
797 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
798 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
799
800 r = neg ? -r : r;
801 #endif
802
803 return r;
804 }
805
806 #endif
807
808 #endif
809