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/cvs/libecb/ecb.h
Revision: 1.161
Committed: Thu Mar 19 20:55:22 2015 UTC (9 years, 2 months ago) by sf-exg
Content type: text/plain
Branch: MAIN
Changes since 1.160: +1 -1 lines
Log Message:
Amend last change.

File Contents

# Content
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 #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 #ifndef ECB_MEMORY_FENCE
156 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
157 #if __i386 || __i386__
158 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
159 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
160 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
161 #elif ECB_GCC_AMD64
162 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
163 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
164 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
165 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
166 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
167 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
168 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
170 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
171 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
172 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
173 #elif __aarch64__
174 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
175 #elif (__sparc || __sparc__) && !__sparcv8
176 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
177 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
178 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
179 #elif defined __s390__ || defined __s390x__
180 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
181 #elif defined __mips__
182 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
183 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
184 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
185 #elif defined __alpha__
186 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
187 #elif defined __hppa__
188 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
189 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
190 #elif defined __ia64__
191 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
192 #elif defined __m68k__
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
194 #elif defined __m88k__
195 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
196 #elif defined __sh__
197 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
198 #endif
199 #endif
200 #endif
201
202 #ifndef ECB_MEMORY_FENCE
203 #if ECB_GCC_VERSION(4,7)
204 /* see comment below (stdatomic.h) about the C11 memory model. */
205 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
206 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
207 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
208
209 #elif ECB_CLANG_EXTENSION(c_atomic)
210 /* see comment below (stdatomic.h) about the C11 memory model. */
211 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
212 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
213 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
214
215 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
216 #define ECB_MEMORY_FENCE __sync_synchronize ()
217 #elif _MSC_VER >= 1500 /* VC++ 2008 */
218 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
219 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
220 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
221 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
222 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
223 #elif _MSC_VER >= 1400 /* VC++ 2005 */
224 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
225 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
226 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
227 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
228 #elif defined _WIN32
229 #include <WinNT.h>
230 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
231 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
232 #include <mbarrier.h>
233 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
234 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
235 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
236 #elif __xlC__
237 #define ECB_MEMORY_FENCE __sync ()
238 #endif
239 #endif
240
241 #ifndef ECB_MEMORY_FENCE
242 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
243 /* we assume that these memory fences work on all variables/all memory accesses, */
244 /* not just C11 atomics and atomic accesses */
245 #include <stdatomic.h>
246 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
247 /* any fence other than seq_cst, which isn't very efficient for us. */
248 /* Why that is, we don't know - either the C11 memory model is quite useless */
249 /* for most usages, or gcc and clang have a bug */
250 /* I *currently* lean towards the latter, and inefficiently implement */
251 /* all three of ecb's fences as a seq_cst fence */
252 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
253 /* for all __atomic_thread_fence's except seq_cst */
254 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
255 #endif
256 #endif
257
258 #ifndef ECB_MEMORY_FENCE
259 #if !ECB_AVOID_PTHREADS
260 /*
261 * if you get undefined symbol references to pthread_mutex_lock,
262 * or failure to find pthread.h, then you should implement
263 * the ECB_MEMORY_FENCE operations for your cpu/compiler
264 * OR provide pthread.h and link against the posix thread library
265 * of your system.
266 */
267 #include <pthread.h>
268 #define ECB_NEEDS_PTHREADS 1
269 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
270
271 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
272 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
273 #endif
274 #endif
275
276 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
277 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
278 #endif
279
280 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
281 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
282 #endif
283
284 /*****************************************************************************/
285
286 #if ECB_CPP
287 #define ecb_inline static inline
288 #elif ECB_GCC_VERSION(2,5)
289 #define ecb_inline static __inline__
290 #elif ECB_C99
291 #define ecb_inline static inline
292 #else
293 #define ecb_inline static
294 #endif
295
296 #if ECB_GCC_VERSION(3,3)
297 #define ecb_restrict __restrict__
298 #elif ECB_C99
299 #define ecb_restrict restrict
300 #else
301 #define ecb_restrict
302 #endif
303
304 typedef int ecb_bool;
305
306 #define ECB_CONCAT_(a, b) a ## b
307 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
308 #define ECB_STRINGIFY_(a) # a
309 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
310 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
311
312 #define ecb_function_ ecb_inline
313
314 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
315 #define ecb_attribute(attrlist) __attribute__ (attrlist)
316 #else
317 #define ecb_attribute(attrlist)
318 #endif
319
320 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
321 #define ecb_is_constant(expr) __builtin_constant_p (expr)
322 #else
323 /* possible C11 impl for integral types
324 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
325 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
326
327 #define ecb_is_constant(expr) 0
328 #endif
329
330 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
331 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
332 #else
333 #define ecb_expect(expr,value) (expr)
334 #endif
335
336 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
337 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
338 #else
339 #define ecb_prefetch(addr,rw,locality)
340 #endif
341
342 /* no emulation for ecb_decltype */
343 #if ECB_CPP11
344 // older implementations might have problems with decltype(x)::type, work around it
345 template<class T> struct ecb_decltype_t { typedef T type; };
346 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
347 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
348 #define ecb_decltype(x) __typeof__ (x)
349 #endif
350
351 #if _MSC_VER >= 1300
352 #define ecb_deprecated __declspec (deprecated)
353 #else
354 #define ecb_deprecated ecb_attribute ((__deprecated__))
355 #endif
356
357 #if __MSC_VER >= 1500
358 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
359 #elif ECB_GCC_VERSION(4,5)
360 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
361 #else
362 #define ecb_deprecated_message(msg) ecb_deprecated
363 #endif
364
365 #if _MSC_VER >= 1400
366 #define ecb_noinline __declspec (noinline)
367 #else
368 #define ecb_noinline ecb_attribute ((__noinline__))
369 #endif
370
371 #define ecb_unused ecb_attribute ((__unused__))
372 #define ecb_const ecb_attribute ((__const__))
373 #define ecb_pure ecb_attribute ((__pure__))
374
375 #if ECB_C11 || __IBMC_NORETURN
376 /* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */
377 #define ecb_noreturn _Noreturn
378 #elif ECB_CPP11
379 #define ecb_noreturn [[noreturn]]
380 #elif _MSC_VER >= 1200
381 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
382 #define ecb_noreturn __declspec (noreturn)
383 #else
384 #define ecb_noreturn ecb_attribute ((__noreturn__))
385 #endif
386
387 #if ECB_GCC_VERSION(4,3)
388 #define ecb_artificial ecb_attribute ((__artificial__))
389 #define ecb_hot ecb_attribute ((__hot__))
390 #define ecb_cold ecb_attribute ((__cold__))
391 #else
392 #define ecb_artificial
393 #define ecb_hot
394 #define ecb_cold
395 #endif
396
397 /* put around conditional expressions if you are very sure that the */
398 /* expression is mostly true or mostly false. note that these return */
399 /* booleans, not the expression. */
400 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
401 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
402 /* for compatibility to the rest of the world */
403 #define ecb_likely(expr) ecb_expect_true (expr)
404 #define ecb_unlikely(expr) ecb_expect_false (expr)
405
406 /* count trailing zero bits and count # of one bits */
407 #if ECB_GCC_VERSION(3,4) \
408 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
409 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
410 && ECB_CLANG_BUILTIN(__builtin_popcount))
411 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
412 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
413 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
414 #define ecb_ctz32(x) __builtin_ctz (x)
415 #define ecb_ctz64(x) __builtin_ctzll (x)
416 #define ecb_popcount32(x) __builtin_popcount (x)
417 /* no popcountll */
418 #else
419 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
420 ecb_function_ ecb_const int
421 ecb_ctz32 (uint32_t x)
422 {
423 int r = 0;
424
425 x &= ~x + 1; /* this isolates the lowest bit */
426
427 #if ECB_branchless_on_i386
428 r += !!(x & 0xaaaaaaaa) << 0;
429 r += !!(x & 0xcccccccc) << 1;
430 r += !!(x & 0xf0f0f0f0) << 2;
431 r += !!(x & 0xff00ff00) << 3;
432 r += !!(x & 0xffff0000) << 4;
433 #else
434 if (x & 0xaaaaaaaa) r += 1;
435 if (x & 0xcccccccc) r += 2;
436 if (x & 0xf0f0f0f0) r += 4;
437 if (x & 0xff00ff00) r += 8;
438 if (x & 0xffff0000) r += 16;
439 #endif
440
441 return r;
442 }
443
444 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
445 ecb_function_ ecb_const int
446 ecb_ctz64 (uint64_t x)
447 {
448 int shift = x & 0xffffffffU ? 0 : 32;
449 return ecb_ctz32 (x >> shift) + shift;
450 }
451
452 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
453 ecb_function_ ecb_const int
454 ecb_popcount32 (uint32_t x)
455 {
456 x -= (x >> 1) & 0x55555555;
457 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
458 x = ((x >> 4) + x) & 0x0f0f0f0f;
459 x *= 0x01010101;
460
461 return x >> 24;
462 }
463
464 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
465 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
466 {
467 int r = 0;
468
469 if (x >> 16) { x >>= 16; r += 16; }
470 if (x >> 8) { x >>= 8; r += 8; }
471 if (x >> 4) { x >>= 4; r += 4; }
472 if (x >> 2) { x >>= 2; r += 2; }
473 if (x >> 1) { r += 1; }
474
475 return r;
476 }
477
478 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
479 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
480 {
481 int r = 0;
482
483 if (x >> 32) { x >>= 32; r += 32; }
484
485 return r + ecb_ld32 (x);
486 }
487 #endif
488
489 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
490 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
491 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
492 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
493
494 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
495 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
496 {
497 return ( (x * 0x0802U & 0x22110U)
498 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
499 }
500
501 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
502 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
503 {
504 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
505 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
506 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
507 x = ( x >> 8 ) | ( x << 8);
508
509 return x;
510 }
511
512 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
513 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
514 {
515 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
516 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
517 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
518 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
519 x = ( x >> 16 ) | ( x << 16);
520
521 return x;
522 }
523
524 /* popcount64 is only available on 64 bit cpus as gcc builtin */
525 /* so for this version we are lazy */
526 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
527 ecb_function_ ecb_const int
528 ecb_popcount64 (uint64_t x)
529 {
530 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
531 }
532
533 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
534 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
535 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
536 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
537 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
538 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
539 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
540 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
541
542 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
543 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
544 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
545 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
546 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
547 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
548 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
549 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
550
551 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
552 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
553 #define ecb_bswap32(x) __builtin_bswap32 (x)
554 #define ecb_bswap64(x) __builtin_bswap64 (x)
555 #else
556 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
557 ecb_function_ ecb_const uint16_t
558 ecb_bswap16 (uint16_t x)
559 {
560 return ecb_rotl16 (x, 8);
561 }
562
563 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
564 ecb_function_ ecb_const uint32_t
565 ecb_bswap32 (uint32_t x)
566 {
567 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
568 }
569
570 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
571 ecb_function_ ecb_const uint64_t
572 ecb_bswap64 (uint64_t x)
573 {
574 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
575 }
576 #endif
577
578 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
579 #define ecb_unreachable() __builtin_unreachable ()
580 #else
581 /* this seems to work fine, but gcc always emits a warning for it :/ */
582 ecb_inline ecb_noreturn void ecb_unreachable (void);
583 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
584 #endif
585
586 /* try to tell the compiler that some condition is definitely true */
587 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
588
589 ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
590 ecb_inline ecb_const unsigned char
591 ecb_byteorder_helper (void)
592 {
593 /* the union code still generates code under pressure in gcc, */
594 /* but less than using pointers, and always seems to */
595 /* successfully return a constant. */
596 /* the reason why we have this horrible preprocessor mess */
597 /* is to avoid it in all cases, at least on common architectures */
598 /* or when using a recent enough gcc version (>= 4.6) */
599 #if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
600 return 0x44;
601 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
602 return 0x44;
603 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
604 return 0x11;
605 #else
606 union
607 {
608 uint32_t i;
609 uint8_t c;
610 } u = { 0x11223344 };
611 return u.c;
612 #endif
613 }
614
615 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
616 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
617 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
618 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
619
620 #if ECB_GCC_VERSION(3,0) || ECB_C99
621 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
622 #else
623 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
624 #endif
625
626 #if ECB_CPP
627 template<typename T>
628 static inline T ecb_div_rd (T val, T div)
629 {
630 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
631 }
632 template<typename T>
633 static inline T ecb_div_ru (T val, T div)
634 {
635 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
636 }
637 #else
638 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
639 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
640 #endif
641
642 #if ecb_cplusplus_does_not_suck
643 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
644 template<typename T, int N>
645 static inline int ecb_array_length (const T (&arr)[N])
646 {
647 return N;
648 }
649 #else
650 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
651 #endif
652
653 /*******************************************************************************/
654 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
655
656 /* basically, everything uses "ieee pure-endian" floating point numbers */
657 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
658 #if 0 \
659 || __i386 || __i386__ \
660 || ECB_GCC_AMD64 \
661 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
662 || defined __s390__ || defined __s390x__ \
663 || defined __mips__ \
664 || defined __alpha__ \
665 || defined __hppa__ \
666 || defined __ia64__ \
667 || defined __m68k__ \
668 || defined __m88k__ \
669 || defined __sh__ \
670 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
671 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
672 || defined __aarch64__
673 #define ECB_STDFP 1
674 #include <string.h> /* for memcpy */
675 #else
676 #define ECB_STDFP 0
677 #endif
678
679 #ifndef ECB_NO_LIBM
680
681 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
682
683 /* only the oldest of old doesn't have this one. solaris. */
684 #ifdef INFINITY
685 #define ECB_INFINITY INFINITY
686 #else
687 #define ECB_INFINITY HUGE_VAL
688 #endif
689
690 #ifdef NAN
691 #define ECB_NAN NAN
692 #else
693 #define ECB_NAN ECB_INFINITY
694 #endif
695
696 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
697 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
698 #else
699 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
700 #endif
701
702 /* converts an ieee half/binary16 to a float */
703 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
704 ecb_function_ ecb_const float
705 ecb_binary16_to_float (uint16_t x)
706 {
707 int e = (x >> 10) & 0x1f;
708 int m = x & 0x3ff;
709 float r;
710
711 if (!e ) r = ecb_ldexpf (m , -24);
712 else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
713 else if (m ) r = ECB_NAN;
714 else r = ECB_INFINITY;
715
716 return x & 0x8000 ? -r : r;
717 }
718
719 /* convert a float to ieee single/binary32 */
720 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
721 ecb_function_ ecb_const uint32_t
722 ecb_float_to_binary32 (float x)
723 {
724 uint32_t r;
725
726 #if ECB_STDFP
727 memcpy (&r, &x, 4);
728 #else
729 /* slow emulation, works for anything but -0 */
730 uint32_t m;
731 int e;
732
733 if (x == 0e0f ) return 0x00000000U;
734 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
735 if (x < -3.40282346638528860e+38f) return 0xff800000U;
736 if (x != x ) return 0x7fbfffffU;
737
738 m = frexpf (x, &e) * 0x1000000U;
739
740 r = m & 0x80000000U;
741
742 if (r)
743 m = -m;
744
745 if (e <= -126)
746 {
747 m &= 0xffffffU;
748 m >>= (-125 - e);
749 e = -126;
750 }
751
752 r |= (e + 126) << 23;
753 r |= m & 0x7fffffU;
754 #endif
755
756 return r;
757 }
758
759 /* converts an ieee single/binary32 to a float */
760 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
761 ecb_function_ ecb_const float
762 ecb_binary32_to_float (uint32_t x)
763 {
764 float r;
765
766 #if ECB_STDFP
767 memcpy (&r, &x, 4);
768 #else
769 /* emulation, only works for normals and subnormals and +0 */
770 int neg = x >> 31;
771 int e = (x >> 23) & 0xffU;
772
773 x &= 0x7fffffU;
774
775 if (e)
776 x |= 0x800000U;
777 else
778 e = 1;
779
780 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
781 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
782
783 r = neg ? -r : r;
784 #endif
785
786 return r;
787 }
788
789 /* convert a double to ieee double/binary64 */
790 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
791 ecb_function_ ecb_const uint64_t
792 ecb_double_to_binary64 (double x)
793 {
794 uint64_t r;
795
796 #if ECB_STDFP
797 memcpy (&r, &x, 8);
798 #else
799 /* slow emulation, works for anything but -0 */
800 uint64_t m;
801 int e;
802
803 if (x == 0e0 ) return 0x0000000000000000U;
804 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
805 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
806 if (x != x ) return 0X7ff7ffffffffffffU;
807
808 m = frexp (x, &e) * 0x20000000000000U;
809
810 r = m & 0x8000000000000000;;
811
812 if (r)
813 m = -m;
814
815 if (e <= -1022)
816 {
817 m &= 0x1fffffffffffffU;
818 m >>= (-1021 - e);
819 e = -1022;
820 }
821
822 r |= ((uint64_t)(e + 1022)) << 52;
823 r |= m & 0xfffffffffffffU;
824 #endif
825
826 return r;
827 }
828
829 /* converts an ieee double/binary64 to a double */
830 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
831 ecb_function_ ecb_const double
832 ecb_binary64_to_double (uint64_t x)
833 {
834 double r;
835
836 #if ECB_STDFP
837 memcpy (&r, &x, 8);
838 #else
839 /* emulation, only works for normals and subnormals and +0 */
840 int neg = x >> 63;
841 int e = (x >> 52) & 0x7ffU;
842
843 x &= 0xfffffffffffffU;
844
845 if (e)
846 x |= 0x10000000000000U;
847 else
848 e = 1;
849
850 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
851 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
852
853 r = neg ? -r : r;
854 #endif
855
856 return r;
857 }
858
859 #endif
860
861 #endif
862