ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libecb/ecb.h
Revision: 1.128
Committed: Thu Jan 9 05:16:12 2014 UTC (10 years, 5 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.127: +6 -0 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2013 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
30 #ifndef ECB_H
31 #define ECB_H
32
33 /* 16 bits major, 16 bits minor */
34 #define ECB_VERSION 0x00010003
35
36 #ifdef _WIN32
37 typedef signed char int8_t;
38 typedef unsigned char uint8_t;
39 typedef signed short int16_t;
40 typedef unsigned short uint16_t;
41 typedef signed int int32_t;
42 typedef unsigned int uint32_t;
43 #if __GNUC__
44 typedef signed long long int64_t;
45 typedef unsigned long long uint64_t;
46 #else /* _MSC_VER || __BORLANDC__ */
47 typedef signed __int64 int64_t;
48 typedef unsigned __int64 uint64_t;
49 #endif
50 #ifdef _WIN64
51 #define ECB_PTRSIZE 8
52 typedef uint64_t uintptr_t;
53 typedef int64_t intptr_t;
54 #else
55 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t;
58 #endif
59 #else
60 #include <inttypes.h>
61 #if UINTMAX_MAX > 0xffffffffU
62 #define ECB_PTRSIZE 8
63 #else
64 #define ECB_PTRSIZE 4
65 #endif
66 #endif
67
68 /* work around x32 idiocy by defining proper macros */
69 #if __amd64 || __x86_64 || _M_AMD64 || _M_X64
70 #if _ILP32
71 #define ECB_AMD64_X32 1
72 #else
73 #define ECB_AMD64 1
74 #endif
75 #endif
76
77 /* many compilers define _GNUC_ to some versions but then only implement
78 * what their idiot authors think are the "more important" extensions,
79 * causing enormous grief in return for some better fake benchmark numbers.
80 * or so.
81 * we try to detect these and simply assume they are not gcc - if they have
82 * an issue with that they should have done it right in the first place.
83 */
84 #ifndef ECB_GCC_VERSION
85 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
86 #define ECB_GCC_VERSION(major,minor) 0
87 #else
88 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
89 #endif
90 #endif
91
92 #define ECB_CPP (__cplusplus+0)
93 #define ECB_CPP11 (__cplusplus >= 201103L)
94
95 #if ECB_CPP
96 #define ECB_C 0
97 #define ECB_STDC_VERSION 0
98 #else
99 #define ECB_C 1
100 #define ECB_STDC_VERSION __STDC_VERSION__
101 #endif
102
103 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
104 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
105
106 #if ECB_CPP
107 #define ECB_EXTERN_C extern "C"
108 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
109 #define ECB_EXTERN_C_END }
110 #else
111 #define ECB_EXTERN_C extern
112 #define ECB_EXTERN_C_BEG
113 #define ECB_EXTERN_C_END
114 #endif
115
116 /*****************************************************************************/
117
118 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
119 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
120
121 #if ECB_NO_THREADS
122 #define ECB_NO_SMP 1
123 #endif
124
125 #if ECB_NO_SMP
126 #define ECB_MEMORY_FENCE do { } while (0)
127 #endif
128
129 #ifndef ECB_MEMORY_FENCE
130 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
131 #if __i386 || __i386__
132 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
133 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
134 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
135 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
136 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
137 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
138 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
139 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
140 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
141 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
142 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
143 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
144 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
145 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
146 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
147 #elif (__sparc || __sparc__) && !__sparcv8
148 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
149 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
150 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
151 #elif defined __s390__ || defined __s390x__
152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
153 #elif defined __mips__
154 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
155 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
156 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
157 #elif defined __alpha__
158 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
159 #elif defined __hppa__
160 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
162 #elif defined __ia64__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
164 #elif defined __m68k__
165 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
166 #elif defined __m88k__
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
168 #elif defined __sh__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
170 #endif
171 #endif
172 #endif
173
174 #ifndef ECB_MEMORY_FENCE
175 #if ECB_GCC_VERSION(4,7)
176 /* see comment below (stdatomic.h) about the C11 memory model. */
177 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
178 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
179 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
180
181 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
182 * without risking compile time errors with other compilers. We *could*
183 * define our own ecb_clang_has_feature, but I just can't be bothered to work
184 * around this shit time and again.
185 * #elif defined __clang && __has_feature (cxx_atomic)
186 * // see comment below (stdatomic.h) about the C11 memory model.
187 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
188 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
189 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
190 */
191
192 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
193 #define ECB_MEMORY_FENCE __sync_synchronize ()
194 #elif _MSC_VER >= 1500 /* VC++ 2008 */
195 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
196 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
197 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
198 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
199 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
200 #elif _MSC_VER >= 1400 /* VC++ 2005 */
201 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
202 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
203 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
204 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
205 #elif defined _WIN32
206 #include <WinNT.h>
207 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
208 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
209 #include <mbarrier.h>
210 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
211 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
212 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
213 #elif __xlC__
214 #define ECB_MEMORY_FENCE __sync ()
215 #endif
216 #endif
217
218 #ifndef ECB_MEMORY_FENCE
219 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
220 /* we assume that these memory fences work on all variables/all memory accesses, */
221 /* not just C11 atomics and atomic accesses */
222 #include <stdatomic.h>
223 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
224 /* any fence other than seq_cst, which isn't very efficient for us. */
225 /* Why that is, we don't know - either the C11 memory model is quite useless */
226 /* for most usages, or gcc and clang have a bug */
227 /* I *currently* lean towards the latter, and inefficiently implement */
228 /* all three of ecb's fences as a seq_cst fence */
229 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
230 /* for all __atomic_thread_fence's except seq_cst */
231 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
232 #endif
233 #endif
234
235 #ifndef ECB_MEMORY_FENCE
236 #if !ECB_AVOID_PTHREADS
237 /*
238 * if you get undefined symbol references to pthread_mutex_lock,
239 * or failure to find pthread.h, then you should implement
240 * the ECB_MEMORY_FENCE operations for your cpu/compiler
241 * OR provide pthread.h and link against the posix thread library
242 * of your system.
243 */
244 #include <pthread.h>
245 #define ECB_NEEDS_PTHREADS 1
246 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
247
248 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
249 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
250 #endif
251 #endif
252
253 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
254 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
255 #endif
256
257 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
258 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
259 #endif
260
261 /*****************************************************************************/
262
263 #if __cplusplus
264 #define ecb_inline static inline
265 #elif ECB_GCC_VERSION(2,5)
266 #define ecb_inline static __inline__
267 #elif ECB_C99
268 #define ecb_inline static inline
269 #else
270 #define ecb_inline static
271 #endif
272
273 #if ECB_GCC_VERSION(3,3)
274 #define ecb_restrict __restrict__
275 #elif ECB_C99
276 #define ecb_restrict restrict
277 #else
278 #define ecb_restrict
279 #endif
280
281 typedef int ecb_bool;
282
283 #define ECB_CONCAT_(a, b) a ## b
284 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
285 #define ECB_STRINGIFY_(a) # a
286 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
287
288 #define ecb_function_ ecb_inline
289
290 #if ECB_GCC_VERSION(3,1)
291 #define ecb_attribute(attrlist) __attribute__(attrlist)
292 #define ecb_is_constant(expr) __builtin_constant_p (expr)
293 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
294 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
295 #else
296 #define ecb_attribute(attrlist)
297
298 /* possible C11 impl for integral types
299 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
300 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
301
302 #define ecb_is_constant(expr) 0
303 #define ecb_expect(expr,value) (expr)
304 #define ecb_prefetch(addr,rw,locality)
305 #endif
306
307 /* no emulation for ecb_decltype */
308 #if ECB_GCC_VERSION(4,5)
309 #define ecb_decltype(x) __decltype(x)
310 #elif ECB_GCC_VERSION(3,0)
311 #define ecb_decltype(x) __typeof(x)
312 #endif
313
314 #define ecb_noinline ecb_attribute ((__noinline__))
315 #define ecb_unused ecb_attribute ((__unused__))
316 #define ecb_const ecb_attribute ((__const__))
317 #define ecb_pure ecb_attribute ((__pure__))
318
319 #if ECB_C11
320 #define ecb_noreturn _Noreturn
321 #else
322 #define ecb_noreturn ecb_attribute ((__noreturn__))
323 #endif
324
325 #if ECB_GCC_VERSION(4,3)
326 #define ecb_artificial ecb_attribute ((__artificial__))
327 #define ecb_hot ecb_attribute ((__hot__))
328 #define ecb_cold ecb_attribute ((__cold__))
329 #else
330 #define ecb_artificial
331 #define ecb_hot
332 #define ecb_cold
333 #endif
334
335 /* put around conditional expressions if you are very sure that the */
336 /* expression is mostly true or mostly false. note that these return */
337 /* booleans, not the expression. */
338 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
339 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
340 /* for compatibility to the rest of the world */
341 #define ecb_likely(expr) ecb_expect_true (expr)
342 #define ecb_unlikely(expr) ecb_expect_false (expr)
343
344 /* count trailing zero bits and count # of one bits */
345 #if ECB_GCC_VERSION(3,4)
346 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
347 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
348 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
349 #define ecb_ctz32(x) __builtin_ctz (x)
350 #define ecb_ctz64(x) __builtin_ctzll (x)
351 #define ecb_popcount32(x) __builtin_popcount (x)
352 /* no popcountll */
353 #else
354 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
355 ecb_function_ int
356 ecb_ctz32 (uint32_t x)
357 {
358 int r = 0;
359
360 x &= ~x + 1; /* this isolates the lowest bit */
361
362 #if ECB_branchless_on_i386
363 r += !!(x & 0xaaaaaaaa) << 0;
364 r += !!(x & 0xcccccccc) << 1;
365 r += !!(x & 0xf0f0f0f0) << 2;
366 r += !!(x & 0xff00ff00) << 3;
367 r += !!(x & 0xffff0000) << 4;
368 #else
369 if (x & 0xaaaaaaaa) r += 1;
370 if (x & 0xcccccccc) r += 2;
371 if (x & 0xf0f0f0f0) r += 4;
372 if (x & 0xff00ff00) r += 8;
373 if (x & 0xffff0000) r += 16;
374 #endif
375
376 return r;
377 }
378
379 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
380 ecb_function_ int
381 ecb_ctz64 (uint64_t x)
382 {
383 int shift = x & 0xffffffffU ? 0 : 32;
384 return ecb_ctz32 (x >> shift) + shift;
385 }
386
387 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
388 ecb_function_ int
389 ecb_popcount32 (uint32_t x)
390 {
391 x -= (x >> 1) & 0x55555555;
392 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
393 x = ((x >> 4) + x) & 0x0f0f0f0f;
394 x *= 0x01010101;
395
396 return x >> 24;
397 }
398
399 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
400 ecb_function_ int ecb_ld32 (uint32_t x)
401 {
402 int r = 0;
403
404 if (x >> 16) { x >>= 16; r += 16; }
405 if (x >> 8) { x >>= 8; r += 8; }
406 if (x >> 4) { x >>= 4; r += 4; }
407 if (x >> 2) { x >>= 2; r += 2; }
408 if (x >> 1) { r += 1; }
409
410 return r;
411 }
412
413 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
414 ecb_function_ int ecb_ld64 (uint64_t x)
415 {
416 int r = 0;
417
418 if (x >> 32) { x >>= 32; r += 32; }
419
420 return r + ecb_ld32 (x);
421 }
422 #endif
423
424 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
425 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
426 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
427 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
428
429 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
430 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
431 {
432 return ( (x * 0x0802U & 0x22110U)
433 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
434 }
435
436 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
437 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
438 {
439 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
440 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
441 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
442 x = ( x >> 8 ) | ( x << 8);
443
444 return x;
445 }
446
447 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
448 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
449 {
450 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
451 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
452 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
453 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
454 x = ( x >> 16 ) | ( x << 16);
455
456 return x;
457 }
458
459 /* popcount64 is only available on 64 bit cpus as gcc builtin */
460 /* so for this version we are lazy */
461 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
462 ecb_function_ int
463 ecb_popcount64 (uint64_t x)
464 {
465 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
466 }
467
468 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
469 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
470 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
471 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
472 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
473 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
474 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
475 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
476
477 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
478 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
479 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
480 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
481 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
482 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
483 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
484 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
485
486 #if ECB_GCC_VERSION(4,3)
487 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
488 #define ecb_bswap32(x) __builtin_bswap32 (x)
489 #define ecb_bswap64(x) __builtin_bswap64 (x)
490 #else
491 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
492 ecb_function_ uint16_t
493 ecb_bswap16 (uint16_t x)
494 {
495 return ecb_rotl16 (x, 8);
496 }
497
498 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
499 ecb_function_ uint32_t
500 ecb_bswap32 (uint32_t x)
501 {
502 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
503 }
504
505 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
506 ecb_function_ uint64_t
507 ecb_bswap64 (uint64_t x)
508 {
509 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
510 }
511 #endif
512
513 #if ECB_GCC_VERSION(4,5)
514 #define ecb_unreachable() __builtin_unreachable ()
515 #else
516 /* this seems to work fine, but gcc always emits a warning for it :/ */
517 ecb_inline void ecb_unreachable (void) ecb_noreturn;
518 ecb_inline void ecb_unreachable (void) { }
519 #endif
520
521 /* try to tell the compiler that some condition is definitely true */
522 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
523
524 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
525 ecb_inline unsigned char
526 ecb_byteorder_helper (void)
527 {
528 /* the union code still generates code under pressure in gcc, */
529 /* but less than using pointers, and always seems to */
530 /* successfully return a constant. */
531 /* the reason why we have this horrible preprocessor mess */
532 /* is to avoid it in all cases, at least on common architectures */
533 /* or when using a recent enough gcc version (>= 4.6) */
534 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
535 return 0x44;
536 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
537 return 0x44;
538 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
539 return 0x11;
540 #else
541 union
542 {
543 uint32_t i;
544 uint8_t c;
545 } u = { 0x11223344 };
546 return u.c;
547 #endif
548 }
549
550 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
551 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
552 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
553 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
554
555 #if ECB_GCC_VERSION(3,0) || ECB_C99
556 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
557 #else
558 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
559 #endif
560
561 #if __cplusplus
562 template<typename T>
563 static inline T ecb_div_rd (T val, T div)
564 {
565 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
566 }
567 template<typename T>
568 static inline T ecb_div_ru (T val, T div)
569 {
570 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
571 }
572 #else
573 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
574 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
575 #endif
576
577 #if ecb_cplusplus_does_not_suck
578 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
579 template<typename T, int N>
580 static inline int ecb_array_length (const T (&arr)[N])
581 {
582 return N;
583 }
584 #else
585 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
586 #endif
587
588 /*******************************************************************************/
589 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
590
591 /* basically, everything uses "ieee pure-endian" floating point numbers */
592 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
593 #if 0 \
594 || __i386 || __i386__ \
595 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
596 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
597 || defined __arm__ && defined __ARM_EABI__ \
598 || defined __s390__ || defined __s390x__ \
599 || defined __mips__ \
600 || defined __alpha__ \
601 || defined __hppa__ \
602 || defined __ia64__ \
603 || defined __m68k__ \
604 || defined __m88k__ \
605 || defined __sh__ \
606 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
607 #define ECB_STDFP 1
608 #include <string.h> /* for memcpy */
609 #else
610 #define ECB_STDFP 0
611 #endif
612
613 #ifndef ECB_NO_LIBM
614
615 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
616
617 /* only the oldest of old doesn't have this one. solaris. */
618 #ifdef INFINITY
619 #define ECB_INFINITY INFINITY
620 #else
621 #define ECB_INFINITY HUGE_VAL
622 #endif
623
624 #ifdef NAN
625 #define ECB_NAN NAN
626 #else
627 #define ECB_NAN ECB_INFINITY
628 #endif
629
630 /* converts an ieee half/binary16 to a float */
631 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
632 ecb_function_ float
633 ecb_binary16_to_float (uint16_t x)
634 {
635 int e = (x >> 10) & 0x1f;
636 int m = x & 0x3ff;
637 float r;
638
639 if (!e ) r = ldexpf (m , -24);
640 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
641 else if (m ) r = ECB_NAN;
642 else r = ECB_INFINITY;
643
644 return x & 0x8000 ? -r : r;
645 }
646
647 /* convert a float to ieee single/binary32 */
648 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
649 ecb_function_ uint32_t
650 ecb_float_to_binary32 (float x)
651 {
652 uint32_t r;
653
654 #if ECB_STDFP
655 memcpy (&r, &x, 4);
656 #else
657 /* slow emulation, works for anything but -0 */
658 uint32_t m;
659 int e;
660
661 if (x == 0e0f ) return 0x00000000U;
662 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
663 if (x < -3.40282346638528860e+38f) return 0xff800000U;
664 if (x != x ) return 0x7fbfffffU;
665
666 m = frexpf (x, &e) * 0x1000000U;
667
668 r = m & 0x80000000U;
669
670 if (r)
671 m = -m;
672
673 if (e <= -126)
674 {
675 m &= 0xffffffU;
676 m >>= (-125 - e);
677 e = -126;
678 }
679
680 r |= (e + 126) << 23;
681 r |= m & 0x7fffffU;
682 #endif
683
684 return r;
685 }
686
687 /* converts an ieee single/binary32 to a float */
688 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
689 ecb_function_ float
690 ecb_binary32_to_float (uint32_t x)
691 {
692 float r;
693
694 #if ECB_STDFP
695 memcpy (&r, &x, 4);
696 #else
697 /* emulation, only works for normals and subnormals and +0 */
698 int neg = x >> 31;
699 int e = (x >> 23) & 0xffU;
700
701 x &= 0x7fffffU;
702
703 if (e)
704 x |= 0x800000U;
705 else
706 e = 1;
707
708 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
709 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
710
711 r = neg ? -r : r;
712 #endif
713
714 return r;
715 }
716
717 /* convert a double to ieee double/binary64 */
718 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
719 ecb_function_ uint64_t
720 ecb_double_to_binary64 (double x)
721 {
722 uint64_t r;
723
724 #if ECB_STDFP
725 memcpy (&r, &x, 8);
726 #else
727 /* slow emulation, works for anything but -0 */
728 uint64_t m;
729 int e;
730
731 if (x == 0e0 ) return 0x0000000000000000U;
732 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
733 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
734 if (x != x ) return 0X7ff7ffffffffffffU;
735
736 m = frexp (x, &e) * 0x20000000000000U;
737
738 r = m & 0x8000000000000000;;
739
740 if (r)
741 m = -m;
742
743 if (e <= -1022)
744 {
745 m &= 0x1fffffffffffffU;
746 m >>= (-1021 - e);
747 e = -1022;
748 }
749
750 r |= ((uint64_t)(e + 1022)) << 52;
751 r |= m & 0xfffffffffffffU;
752 #endif
753
754 return r;
755 }
756
757 /* converts an ieee double/binary64 to a double */
758 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
759 ecb_function_ double
760 ecb_binary64_to_double (uint64_t x)
761 {
762 double r;
763
764 #if ECB_STDFP
765 memcpy (&r, &x, 8);
766 #else
767 /* emulation, only works for normals and subnormals and +0 */
768 int neg = x >> 63;
769 int e = (x >> 52) & 0x7ffU;
770
771 x &= 0xfffffffffffffU;
772
773 if (e)
774 x |= 0x10000000000000U;
775 else
776 e = 1;
777
778 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
779 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
780
781 r = neg ? -r : r;
782 #endif
783
784 return r;
785 }
786
787 #endif
788
789 #endif
790