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Revision: 1.157
Committed: Fri Feb 20 17:17:26 2015 UTC (9 years, 3 months ago) by root
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Branch: MAIN
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Alternatively, the contents of this file may be used under the terms of
30 * the GNU General Public License ("GPL") version 2 or any later version,
31 * in which case the provisions of the GPL are applicable instead of
32 * the above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the BSD license, indicate your decision
35 * by deleting the provisions above and replace them with the notice
36 * and other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file under
38 * either the BSD or the GPL.
39 */
40
41 #ifndef ECB_H
42 #define ECB_H
43
44 /* 16 bits major, 16 bits minor */
45 #define ECB_VERSION 0x00010004
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_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
102
103 #if __clang__ && defined __has_builtin
104 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
105 #else
106 #define ECB_CLANG_BUILTIN(x) 0
107 #endif
108
109 #if __clang__ && defined __has_extension
110 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
111 #else
112 #define ECB_CLANG_EXTENSION(x) 0
113 #endif
114
115 #define ECB_CPP (__cplusplus+0)
116 #define ECB_CPP11 (__cplusplus >= 201103L)
117
118 #if ECB_CPP
119 #define ECB_C 0
120 #define ECB_STDC_VERSION 0
121 #else
122 #define ECB_C 1
123 #define ECB_STDC_VERSION __STDC_VERSION__
124 #endif
125
126 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
127 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
128
129 #if ECB_CPP
130 #define ECB_EXTERN_C extern "C"
131 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
132 #define ECB_EXTERN_C_END }
133 #else
134 #define ECB_EXTERN_C extern
135 #define ECB_EXTERN_C_BEG
136 #define ECB_EXTERN_C_END
137 #endif
138
139 /*****************************************************************************/
140
141 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
142 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
143
144 #if ECB_NO_THREADS
145 #define ECB_NO_SMP 1
146 #endif
147
148 #if ECB_NO_SMP
149 #define ECB_MEMORY_FENCE do { } while (0)
150 #endif
151
152 #ifndef ECB_MEMORY_FENCE
153 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
154 #if __i386 || __i386__
155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
156 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
157 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
158 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
160 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
162 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
164 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
165 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
166 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
167 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
168 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
170 #elif __aarch64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
172 #elif (__sparc || __sparc__) && !__sparcv8
173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
174 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
175 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
176 #elif defined __s390__ || defined __s390x__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
178 #elif defined __mips__
179 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
180 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
182 #elif defined __alpha__
183 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
184 #elif defined __hppa__
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
186 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
187 #elif defined __ia64__
188 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
189 #elif defined __m68k__
190 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
191 #elif defined __m88k__
192 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
193 #elif defined __sh__
194 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
195 #endif
196 #endif
197 #endif
198
199 #ifndef ECB_MEMORY_FENCE
200 #if ECB_GCC_VERSION(4,7)
201 /* see comment below (stdatomic.h) about the C11 memory model. */
202 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
203 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
204 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
205
206 #elif ECB_CLANG_EXTENSION(c_atomic)
207 /* see comment below (stdatomic.h) about the C11 memory model. */
208 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
209 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
210 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
211
212 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
213 #define ECB_MEMORY_FENCE __sync_synchronize ()
214 #elif _MSC_VER >= 1500 /* VC++ 2008 */
215 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
216 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
217 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
218 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
219 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
220 #elif _MSC_VER >= 1400 /* VC++ 2005 */
221 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
222 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
223 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
224 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
225 #elif defined _WIN32
226 #include <WinNT.h>
227 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
228 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
229 #include <mbarrier.h>
230 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
232 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
233 #elif __xlC__
234 #define ECB_MEMORY_FENCE __sync ()
235 #endif
236 #endif
237
238 #ifndef ECB_MEMORY_FENCE
239 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
240 /* we assume that these memory fences work on all variables/all memory accesses, */
241 /* not just C11 atomics and atomic accesses */
242 #include <stdatomic.h>
243 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
244 /* any fence other than seq_cst, which isn't very efficient for us. */
245 /* Why that is, we don't know - either the C11 memory model is quite useless */
246 /* for most usages, or gcc and clang have a bug */
247 /* I *currently* lean towards the latter, and inefficiently implement */
248 /* all three of ecb's fences as a seq_cst fence */
249 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
250 /* for all __atomic_thread_fence's except seq_cst */
251 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
252 #endif
253 #endif
254
255 #ifndef ECB_MEMORY_FENCE
256 #if !ECB_AVOID_PTHREADS
257 /*
258 * if you get undefined symbol references to pthread_mutex_lock,
259 * or failure to find pthread.h, then you should implement
260 * the ECB_MEMORY_FENCE operations for your cpu/compiler
261 * OR provide pthread.h and link against the posix thread library
262 * of your system.
263 */
264 #include <pthread.h>
265 #define ECB_NEEDS_PTHREADS 1
266 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
267
268 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
269 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
270 #endif
271 #endif
272
273 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
274 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
275 #endif
276
277 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
278 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
279 #endif
280
281 /*****************************************************************************/
282
283 #if ECB_CPP
284 #define ecb_inline static inline
285 #elif ECB_GCC_VERSION(2,5)
286 #define ecb_inline static __inline__
287 #elif ECB_C99
288 #define ecb_inline static inline
289 #else
290 #define ecb_inline static
291 #endif
292
293 #if ECB_GCC_VERSION(3,3)
294 #define ecb_restrict __restrict__
295 #elif ECB_C99
296 #define ecb_restrict restrict
297 #else
298 #define ecb_restrict
299 #endif
300
301 typedef int ecb_bool;
302
303 #define ECB_CONCAT_(a, b) a ## b
304 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
305 #define ECB_STRINGIFY_(a) # a
306 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
307 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
308
309 #define ecb_function_ ecb_inline
310
311 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
312 #define ecb_attribute(attrlist) __attribute__ (attrlist)
313 #else
314 #define ecb_attribute(attrlist)
315 #endif
316
317 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
318 #define ecb_is_constant(expr) __builtin_constant_p (expr)
319 #else
320 /* possible C11 impl for integral types
321 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
322 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
323
324 #define ecb_is_constant(expr) 0
325 #endif
326
327 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
328 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
329 #else
330 #define ecb_expect(expr,value) (expr)
331 #endif
332
333 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
334 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
335 #else
336 #define ecb_prefetch(addr,rw,locality)
337 #endif
338
339 /* no emulation for ecb_decltype */
340 #if ECB_CPP11
341 // older implementations might have problems with decltype(x)::type, work around it
342 template<class T> struct ecb_decltype_t { typedef T type; };
343 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
344 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
345 #define ecb_decltype(x) __typeof__ (x)
346 #endif
347
348 #if _MSC_VER >= 1300
349 #define ecb_deprecated __declspec (deprecated)
350 #else
351 #define ecb_deprecated ecb_attribute ((__deprecated__))
352 #endif
353
354 #if __MSC_VER >= 1500
355 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
356 #elif ECB_GCC_VERSION(4,5)
357 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
358 #else
359 #define ecb_deprecated_message(msg) ecb_deprecated
360 #endif
361
362 #if _MSC_VER >= 1400
363 #define ecb_noinline __declspec (noinline)
364 #else
365 #define ecb_noinline ecb_attribute ((__noinline__))
366 #endif
367
368 #define ecb_unused ecb_attribute ((__unused__))
369 #define ecb_const ecb_attribute ((__const__))
370 #define ecb_pure ecb_attribute ((__pure__))
371
372 #if ECB_C11 || __IBMC_NORETURN
373 /* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */
374 #define ecb_noreturn _Noreturn
375 #elif ECB_CPP11
376 #define ecb_noreturn [[noreturn]]
377 #elif _MSC_VER >= 1200
378 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
379 #define ecb_noreturn __declspec (noreturn)
380 #else
381 #define ecb_noreturn ecb_attribute ((__noreturn__))
382 #endif
383
384 #if ECB_GCC_VERSION(4,3)
385 #define ecb_artificial ecb_attribute ((__artificial__))
386 #define ecb_hot ecb_attribute ((__hot__))
387 #define ecb_cold ecb_attribute ((__cold__))
388 #else
389 #define ecb_artificial
390 #define ecb_hot
391 #define ecb_cold
392 #endif
393
394 /* put around conditional expressions if you are very sure that the */
395 /* expression is mostly true or mostly false. note that these return */
396 /* booleans, not the expression. */
397 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
398 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
399 /* for compatibility to the rest of the world */
400 #define ecb_likely(expr) ecb_expect_true (expr)
401 #define ecb_unlikely(expr) ecb_expect_false (expr)
402
403 /* count trailing zero bits and count # of one bits */
404 #if ECB_GCC_VERSION(3,4) \
405 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
406 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
407 && ECB_CLANG_BUILTIN(__builtin_popcount))
408 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
409 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
410 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
411 #define ecb_ctz32(x) __builtin_ctz (x)
412 #define ecb_ctz64(x) __builtin_ctzll (x)
413 #define ecb_popcount32(x) __builtin_popcount (x)
414 /* no popcountll */
415 #else
416 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
417 ecb_function_ ecb_const int
418 ecb_ctz32 (uint32_t x)
419 {
420 int r = 0;
421
422 x &= ~x + 1; /* this isolates the lowest bit */
423
424 #if ECB_branchless_on_i386
425 r += !!(x & 0xaaaaaaaa) << 0;
426 r += !!(x & 0xcccccccc) << 1;
427 r += !!(x & 0xf0f0f0f0) << 2;
428 r += !!(x & 0xff00ff00) << 3;
429 r += !!(x & 0xffff0000) << 4;
430 #else
431 if (x & 0xaaaaaaaa) r += 1;
432 if (x & 0xcccccccc) r += 2;
433 if (x & 0xf0f0f0f0) r += 4;
434 if (x & 0xff00ff00) r += 8;
435 if (x & 0xffff0000) r += 16;
436 #endif
437
438 return r;
439 }
440
441 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
442 ecb_function_ ecb_const int
443 ecb_ctz64 (uint64_t x)
444 {
445 int shift = x & 0xffffffffU ? 0 : 32;
446 return ecb_ctz32 (x >> shift) + shift;
447 }
448
449 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
450 ecb_function_ ecb_const int
451 ecb_popcount32 (uint32_t x)
452 {
453 x -= (x >> 1) & 0x55555555;
454 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
455 x = ((x >> 4) + x) & 0x0f0f0f0f;
456 x *= 0x01010101;
457
458 return x >> 24;
459 }
460
461 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
462 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
463 {
464 int r = 0;
465
466 if (x >> 16) { x >>= 16; r += 16; }
467 if (x >> 8) { x >>= 8; r += 8; }
468 if (x >> 4) { x >>= 4; r += 4; }
469 if (x >> 2) { x >>= 2; r += 2; }
470 if (x >> 1) { r += 1; }
471
472 return r;
473 }
474
475 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
476 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
477 {
478 int r = 0;
479
480 if (x >> 32) { x >>= 32; r += 32; }
481
482 return r + ecb_ld32 (x);
483 }
484 #endif
485
486 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
487 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
488 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
489 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
490
491 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
492 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
493 {
494 return ( (x * 0x0802U & 0x22110U)
495 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
496 }
497
498 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
499 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
500 {
501 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
502 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
503 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
504 x = ( x >> 8 ) | ( x << 8);
505
506 return x;
507 }
508
509 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
510 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
511 {
512 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
513 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
514 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
515 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
516 x = ( x >> 16 ) | ( x << 16);
517
518 return x;
519 }
520
521 /* popcount64 is only available on 64 bit cpus as gcc builtin */
522 /* so for this version we are lazy */
523 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
524 ecb_function_ ecb_const int
525 ecb_popcount64 (uint64_t x)
526 {
527 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
528 }
529
530 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
531 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
532 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
533 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
534 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
535 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
536 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
537 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
538
539 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
540 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
541 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
542 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
543 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
544 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
545 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
546 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
547
548 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
549 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
550 #define ecb_bswap32(x) __builtin_bswap32 (x)
551 #define ecb_bswap64(x) __builtin_bswap64 (x)
552 #else
553 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
554 ecb_function_ ecb_const uint16_t
555 ecb_bswap16 (uint16_t x)
556 {
557 return ecb_rotl16 (x, 8);
558 }
559
560 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
561 ecb_function_ ecb_const uint32_t
562 ecb_bswap32 (uint32_t x)
563 {
564 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
565 }
566
567 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
568 ecb_function_ ecb_const uint64_t
569 ecb_bswap64 (uint64_t x)
570 {
571 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
572 }
573 #endif
574
575 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
576 #define ecb_unreachable() __builtin_unreachable ()
577 #else
578 /* this seems to work fine, but gcc always emits a warning for it :/ */
579 ecb_inline ecb_noreturn void ecb_unreachable (void);
580 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
581 #endif
582
583 /* try to tell the compiler that some condition is definitely true */
584 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
585
586 ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
587 ecb_inline ecb_const unsigned char
588 ecb_byteorder_helper (void)
589 {
590 /* the union code still generates code under pressure in gcc, */
591 /* but less than using pointers, and always seems to */
592 /* successfully return a constant. */
593 /* the reason why we have this horrible preprocessor mess */
594 /* is to avoid it in all cases, at least on common architectures */
595 /* or when using a recent enough gcc version (>= 4.6) */
596 #if ((__i386 || __i386__) && !__VOS__) || _M_X86 || __amd64 || __amd64__ || _M_X64
597 return 0x44;
598 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
599 return 0x44;
600 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
601 return 0x11;
602 #else
603 union
604 {
605 uint32_t i;
606 uint8_t c;
607 } u = { 0x11223344 };
608 return u.c;
609 #endif
610 }
611
612 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
613 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
614 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
615 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
616
617 #if ECB_GCC_VERSION(3,0) || ECB_C99
618 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
619 #else
620 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
621 #endif
622
623 #if ECB_CPP
624 template<typename T>
625 static inline T ecb_div_rd (T val, T div)
626 {
627 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
628 }
629 template<typename T>
630 static inline T ecb_div_ru (T val, T div)
631 {
632 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
633 }
634 #else
635 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
636 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
637 #endif
638
639 #if ecb_cplusplus_does_not_suck
640 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
641 template<typename T, int N>
642 static inline int ecb_array_length (const T (&arr)[N])
643 {
644 return N;
645 }
646 #else
647 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
648 #endif
649
650 /*******************************************************************************/
651 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
652
653 /* basically, everything uses "ieee pure-endian" floating point numbers */
654 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
655 #if 0 \
656 || __i386 || __i386__ \
657 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
658 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
659 || defined __s390__ || defined __s390x__ \
660 || defined __mips__ \
661 || defined __alpha__ \
662 || defined __hppa__ \
663 || defined __ia64__ \
664 || defined __m68k__ \
665 || defined __m88k__ \
666 || defined __sh__ \
667 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
668 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
669 || defined __aarch64__
670 #define ECB_STDFP 1
671 #include <string.h> /* for memcpy */
672 #else
673 #define ECB_STDFP 0
674 #endif
675
676 #ifndef ECB_NO_LIBM
677
678 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
679
680 /* only the oldest of old doesn't have this one. solaris. */
681 #ifdef INFINITY
682 #define ECB_INFINITY INFINITY
683 #else
684 #define ECB_INFINITY HUGE_VAL
685 #endif
686
687 #ifdef NAN
688 #define ECB_NAN NAN
689 #else
690 #define ECB_NAN ECB_INFINITY
691 #endif
692
693 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
694 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
695 #else
696 #define ecb_ldexpf(x,e) (float) ldexp ((x), (e))
697 #endif
698
699 /* converts an ieee half/binary16 to a float */
700 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
701 ecb_function_ ecb_const float
702 ecb_binary16_to_float (uint16_t x)
703 {
704 int e = (x >> 10) & 0x1f;
705 int m = x & 0x3ff;
706 float r;
707
708 if (!e ) r = ecb_ldexpf (m , -24);
709 else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
710 else if (m ) r = ECB_NAN;
711 else r = ECB_INFINITY;
712
713 return x & 0x8000 ? -r : r;
714 }
715
716 /* convert a float to ieee single/binary32 */
717 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
718 ecb_function_ ecb_const uint32_t
719 ecb_float_to_binary32 (float x)
720 {
721 uint32_t r;
722
723 #if ECB_STDFP
724 memcpy (&r, &x, 4);
725 #else
726 /* slow emulation, works for anything but -0 */
727 uint32_t m;
728 int e;
729
730 if (x == 0e0f ) return 0x00000000U;
731 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
732 if (x < -3.40282346638528860e+38f) return 0xff800000U;
733 if (x != x ) return 0x7fbfffffU;
734
735 m = frexpf (x, &e) * 0x1000000U;
736
737 r = m & 0x80000000U;
738
739 if (r)
740 m = -m;
741
742 if (e <= -126)
743 {
744 m &= 0xffffffU;
745 m >>= (-125 - e);
746 e = -126;
747 }
748
749 r |= (e + 126) << 23;
750 r |= m & 0x7fffffU;
751 #endif
752
753 return r;
754 }
755
756 /* converts an ieee single/binary32 to a float */
757 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
758 ecb_function_ ecb_const float
759 ecb_binary32_to_float (uint32_t x)
760 {
761 float r;
762
763 #if ECB_STDFP
764 memcpy (&r, &x, 4);
765 #else
766 /* emulation, only works for normals and subnormals and +0 */
767 int neg = x >> 31;
768 int e = (x >> 23) & 0xffU;
769
770 x &= 0x7fffffU;
771
772 if (e)
773 x |= 0x800000U;
774 else
775 e = 1;
776
777 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
778 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
779
780 r = neg ? -r : r;
781 #endif
782
783 return r;
784 }
785
786 /* convert a double to ieee double/binary64 */
787 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
788 ecb_function_ ecb_const uint64_t
789 ecb_double_to_binary64 (double x)
790 {
791 uint64_t r;
792
793 #if ECB_STDFP
794 memcpy (&r, &x, 8);
795 #else
796 /* slow emulation, works for anything but -0 */
797 uint64_t m;
798 int e;
799
800 if (x == 0e0 ) return 0x0000000000000000U;
801 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
802 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
803 if (x != x ) return 0X7ff7ffffffffffffU;
804
805 m = frexp (x, &e) * 0x20000000000000U;
806
807 r = m & 0x8000000000000000;;
808
809 if (r)
810 m = -m;
811
812 if (e <= -1022)
813 {
814 m &= 0x1fffffffffffffU;
815 m >>= (-1021 - e);
816 e = -1022;
817 }
818
819 r |= ((uint64_t)(e + 1022)) << 52;
820 r |= m & 0xfffffffffffffU;
821 #endif
822
823 return r;
824 }
825
826 /* converts an ieee double/binary64 to a double */
827 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
828 ecb_function_ ecb_const double
829 ecb_binary64_to_double (uint64_t x)
830 {
831 double r;
832
833 #if ECB_STDFP
834 memcpy (&r, &x, 8);
835 #else
836 /* emulation, only works for normals and subnormals and +0 */
837 int neg = x >> 63;
838 int e = (x >> 52) & 0x7ffU;
839
840 x &= 0xfffffffffffffU;
841
842 if (e)
843 x |= 0x10000000000000U;
844 else
845 e = 1;
846
847 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
848 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
849
850 r = neg ? -r : r;
851 #endif
852
853 return r;
854 }
855
856 #endif
857
858 #endif
859