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Revision: 1.127
Committed: Sun Jan 5 15:54:09 2014 UTC (10 years, 5 months ago) by root
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Branch: MAIN
Changes since 1.126: +16 -3 lines
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# 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
179 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
180 * without risking compile time errors with other compilers. We *could*
181 * define our own ecb_clang_has_feature, but I just can't be bothered to work
182 * around this shit time and again.
183 * #elif defined __clang && __has_feature (cxx_atomic)
184 * // see comment below (stdatomic.h) about the C11 memory model.
185 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
186 */
187
188 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
189 #define ECB_MEMORY_FENCE __sync_synchronize ()
190 #elif _MSC_VER >= 1500 /* VC++ 2008 */
191 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
192 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
193 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
194 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
195 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
196 #elif _MSC_VER >= 1400 /* VC++ 2005 */
197 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
198 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
199 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
200 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
201 #elif defined _WIN32
202 #include <WinNT.h>
203 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
204 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
205 #include <mbarrier.h>
206 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
207 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
208 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
209 #elif __xlC__
210 #define ECB_MEMORY_FENCE __sync ()
211 #endif
212 #endif
213
214 #ifndef ECB_MEMORY_FENCE
215 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
216 /* we assume that these memory fences work on all variables/all memory accesses, */
217 /* not just C11 atomics and atomic accesses */
218 #include <stdatomic.h>
219 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
220 /* any fence other than seq_cst, which isn't very efficient for us. */
221 /* Why that is, we don't know - either the C11 memory model is quite useless */
222 /* for most usages, or gcc and clang have a bug */
223 /* I *currently* lean towards the latter, and inefficiently implement */
224 /* all three of ecb's fences as a seq_cst fence */
225 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
226 #endif
227 #endif
228
229 #ifndef ECB_MEMORY_FENCE
230 #if !ECB_AVOID_PTHREADS
231 /*
232 * if you get undefined symbol references to pthread_mutex_lock,
233 * or failure to find pthread.h, then you should implement
234 * the ECB_MEMORY_FENCE operations for your cpu/compiler
235 * OR provide pthread.h and link against the posix thread library
236 * of your system.
237 */
238 #include <pthread.h>
239 #define ECB_NEEDS_PTHREADS 1
240 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
241
242 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
243 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
244 #endif
245 #endif
246
247 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
248 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
249 #endif
250
251 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
252 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
253 #endif
254
255 /*****************************************************************************/
256
257 #if __cplusplus
258 #define ecb_inline static inline
259 #elif ECB_GCC_VERSION(2,5)
260 #define ecb_inline static __inline__
261 #elif ECB_C99
262 #define ecb_inline static inline
263 #else
264 #define ecb_inline static
265 #endif
266
267 #if ECB_GCC_VERSION(3,3)
268 #define ecb_restrict __restrict__
269 #elif ECB_C99
270 #define ecb_restrict restrict
271 #else
272 #define ecb_restrict
273 #endif
274
275 typedef int ecb_bool;
276
277 #define ECB_CONCAT_(a, b) a ## b
278 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
279 #define ECB_STRINGIFY_(a) # a
280 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
281
282 #define ecb_function_ ecb_inline
283
284 #if ECB_GCC_VERSION(3,1)
285 #define ecb_attribute(attrlist) __attribute__(attrlist)
286 #define ecb_is_constant(expr) __builtin_constant_p (expr)
287 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
288 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
289 #else
290 #define ecb_attribute(attrlist)
291
292 /* possible C11 impl for integral types
293 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
294 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
295
296 #define ecb_is_constant(expr) 0
297 #define ecb_expect(expr,value) (expr)
298 #define ecb_prefetch(addr,rw,locality)
299 #endif
300
301 /* no emulation for ecb_decltype */
302 #if ECB_GCC_VERSION(4,5)
303 #define ecb_decltype(x) __decltype(x)
304 #elif ECB_GCC_VERSION(3,0)
305 #define ecb_decltype(x) __typeof(x)
306 #endif
307
308 #define ecb_noinline ecb_attribute ((__noinline__))
309 #define ecb_unused ecb_attribute ((__unused__))
310 #define ecb_const ecb_attribute ((__const__))
311 #define ecb_pure ecb_attribute ((__pure__))
312
313 #if ECB_C11
314 #define ecb_noreturn _Noreturn
315 #else
316 #define ecb_noreturn ecb_attribute ((__noreturn__))
317 #endif
318
319 #if ECB_GCC_VERSION(4,3)
320 #define ecb_artificial ecb_attribute ((__artificial__))
321 #define ecb_hot ecb_attribute ((__hot__))
322 #define ecb_cold ecb_attribute ((__cold__))
323 #else
324 #define ecb_artificial
325 #define ecb_hot
326 #define ecb_cold
327 #endif
328
329 /* put around conditional expressions if you are very sure that the */
330 /* expression is mostly true or mostly false. note that these return */
331 /* booleans, not the expression. */
332 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
333 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
334 /* for compatibility to the rest of the world */
335 #define ecb_likely(expr) ecb_expect_true (expr)
336 #define ecb_unlikely(expr) ecb_expect_false (expr)
337
338 /* count trailing zero bits and count # of one bits */
339 #if ECB_GCC_VERSION(3,4)
340 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
341 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
342 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
343 #define ecb_ctz32(x) __builtin_ctz (x)
344 #define ecb_ctz64(x) __builtin_ctzll (x)
345 #define ecb_popcount32(x) __builtin_popcount (x)
346 /* no popcountll */
347 #else
348 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
349 ecb_function_ int
350 ecb_ctz32 (uint32_t x)
351 {
352 int r = 0;
353
354 x &= ~x + 1; /* this isolates the lowest bit */
355
356 #if ECB_branchless_on_i386
357 r += !!(x & 0xaaaaaaaa) << 0;
358 r += !!(x & 0xcccccccc) << 1;
359 r += !!(x & 0xf0f0f0f0) << 2;
360 r += !!(x & 0xff00ff00) << 3;
361 r += !!(x & 0xffff0000) << 4;
362 #else
363 if (x & 0xaaaaaaaa) r += 1;
364 if (x & 0xcccccccc) r += 2;
365 if (x & 0xf0f0f0f0) r += 4;
366 if (x & 0xff00ff00) r += 8;
367 if (x & 0xffff0000) r += 16;
368 #endif
369
370 return r;
371 }
372
373 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
374 ecb_function_ int
375 ecb_ctz64 (uint64_t x)
376 {
377 int shift = x & 0xffffffffU ? 0 : 32;
378 return ecb_ctz32 (x >> shift) + shift;
379 }
380
381 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
382 ecb_function_ int
383 ecb_popcount32 (uint32_t x)
384 {
385 x -= (x >> 1) & 0x55555555;
386 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
387 x = ((x >> 4) + x) & 0x0f0f0f0f;
388 x *= 0x01010101;
389
390 return x >> 24;
391 }
392
393 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
394 ecb_function_ int ecb_ld32 (uint32_t x)
395 {
396 int r = 0;
397
398 if (x >> 16) { x >>= 16; r += 16; }
399 if (x >> 8) { x >>= 8; r += 8; }
400 if (x >> 4) { x >>= 4; r += 4; }
401 if (x >> 2) { x >>= 2; r += 2; }
402 if (x >> 1) { r += 1; }
403
404 return r;
405 }
406
407 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
408 ecb_function_ int ecb_ld64 (uint64_t x)
409 {
410 int r = 0;
411
412 if (x >> 32) { x >>= 32; r += 32; }
413
414 return r + ecb_ld32 (x);
415 }
416 #endif
417
418 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
419 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
420 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
421 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
422
423 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
424 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
425 {
426 return ( (x * 0x0802U & 0x22110U)
427 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
428 }
429
430 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
431 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
432 {
433 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
434 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
435 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
436 x = ( x >> 8 ) | ( x << 8);
437
438 return x;
439 }
440
441 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
442 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
443 {
444 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
445 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
446 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
447 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
448 x = ( x >> 16 ) | ( x << 16);
449
450 return x;
451 }
452
453 /* popcount64 is only available on 64 bit cpus as gcc builtin */
454 /* so for this version we are lazy */
455 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
456 ecb_function_ int
457 ecb_popcount64 (uint64_t x)
458 {
459 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
460 }
461
462 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
463 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
464 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
465 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
466 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
467 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
468 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
469 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
470
471 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
472 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
473 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
474 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
475 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
476 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
477 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
478 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
479
480 #if ECB_GCC_VERSION(4,3)
481 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
482 #define ecb_bswap32(x) __builtin_bswap32 (x)
483 #define ecb_bswap64(x) __builtin_bswap64 (x)
484 #else
485 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
486 ecb_function_ uint16_t
487 ecb_bswap16 (uint16_t x)
488 {
489 return ecb_rotl16 (x, 8);
490 }
491
492 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
493 ecb_function_ uint32_t
494 ecb_bswap32 (uint32_t x)
495 {
496 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
497 }
498
499 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
500 ecb_function_ uint64_t
501 ecb_bswap64 (uint64_t x)
502 {
503 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
504 }
505 #endif
506
507 #if ECB_GCC_VERSION(4,5)
508 #define ecb_unreachable() __builtin_unreachable ()
509 #else
510 /* this seems to work fine, but gcc always emits a warning for it :/ */
511 ecb_inline void ecb_unreachable (void) ecb_noreturn;
512 ecb_inline void ecb_unreachable (void) { }
513 #endif
514
515 /* try to tell the compiler that some condition is definitely true */
516 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
517
518 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
519 ecb_inline unsigned char
520 ecb_byteorder_helper (void)
521 {
522 /* the union code still generates code under pressure in gcc, */
523 /* but less than using pointers, and always seems to */
524 /* successfully return a constant. */
525 /* the reason why we have this horrible preprocessor mess */
526 /* is to avoid it in all cases, at least on common architectures */
527 /* or when using a recent enough gcc version (>= 4.6) */
528 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
529 return 0x44;
530 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
531 return 0x44;
532 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
533 return 0x11;
534 #else
535 union
536 {
537 uint32_t i;
538 uint8_t c;
539 } u = { 0x11223344 };
540 return u.c;
541 #endif
542 }
543
544 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
545 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
546 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
547 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
548
549 #if ECB_GCC_VERSION(3,0) || ECB_C99
550 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
551 #else
552 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
553 #endif
554
555 #if __cplusplus
556 template<typename T>
557 static inline T ecb_div_rd (T val, T div)
558 {
559 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
560 }
561 template<typename T>
562 static inline T ecb_div_ru (T val, T div)
563 {
564 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
565 }
566 #else
567 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
568 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
569 #endif
570
571 #if ecb_cplusplus_does_not_suck
572 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
573 template<typename T, int N>
574 static inline int ecb_array_length (const T (&arr)[N])
575 {
576 return N;
577 }
578 #else
579 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
580 #endif
581
582 /*******************************************************************************/
583 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
584
585 /* basically, everything uses "ieee pure-endian" floating point numbers */
586 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
587 #if 0 \
588 || __i386 || __i386__ \
589 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
590 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
591 || defined __arm__ && defined __ARM_EABI__ \
592 || defined __s390__ || defined __s390x__ \
593 || defined __mips__ \
594 || defined __alpha__ \
595 || defined __hppa__ \
596 || defined __ia64__ \
597 || defined __m68k__ \
598 || defined __m88k__ \
599 || defined __sh__ \
600 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
601 #define ECB_STDFP 1
602 #include <string.h> /* for memcpy */
603 #else
604 #define ECB_STDFP 0
605 #endif
606
607 #ifndef ECB_NO_LIBM
608
609 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
610
611 /* only the oldest of old doesn't have this one. solaris. */
612 #ifdef INFINITY
613 #define ECB_INFINITY INFINITY
614 #else
615 #define ECB_INFINITY HUGE_VAL
616 #endif
617
618 #ifdef NAN
619 #define ECB_NAN NAN
620 #else
621 #define ECB_NAN ECB_INFINITY
622 #endif
623
624 /* converts an ieee half/binary16 to a float */
625 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
626 ecb_function_ float
627 ecb_binary16_to_float (uint16_t x)
628 {
629 int e = (x >> 10) & 0x1f;
630 int m = x & 0x3ff;
631 float r;
632
633 if (!e ) r = ldexpf (m , -24);
634 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
635 else if (m ) r = ECB_NAN;
636 else r = ECB_INFINITY;
637
638 return x & 0x8000 ? -r : r;
639 }
640
641 /* convert a float to ieee single/binary32 */
642 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
643 ecb_function_ uint32_t
644 ecb_float_to_binary32 (float x)
645 {
646 uint32_t r;
647
648 #if ECB_STDFP
649 memcpy (&r, &x, 4);
650 #else
651 /* slow emulation, works for anything but -0 */
652 uint32_t m;
653 int e;
654
655 if (x == 0e0f ) return 0x00000000U;
656 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
657 if (x < -3.40282346638528860e+38f) return 0xff800000U;
658 if (x != x ) return 0x7fbfffffU;
659
660 m = frexpf (x, &e) * 0x1000000U;
661
662 r = m & 0x80000000U;
663
664 if (r)
665 m = -m;
666
667 if (e <= -126)
668 {
669 m &= 0xffffffU;
670 m >>= (-125 - e);
671 e = -126;
672 }
673
674 r |= (e + 126) << 23;
675 r |= m & 0x7fffffU;
676 #endif
677
678 return r;
679 }
680
681 /* converts an ieee single/binary32 to a float */
682 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
683 ecb_function_ float
684 ecb_binary32_to_float (uint32_t x)
685 {
686 float r;
687
688 #if ECB_STDFP
689 memcpy (&r, &x, 4);
690 #else
691 /* emulation, only works for normals and subnormals and +0 */
692 int neg = x >> 31;
693 int e = (x >> 23) & 0xffU;
694
695 x &= 0x7fffffU;
696
697 if (e)
698 x |= 0x800000U;
699 else
700 e = 1;
701
702 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
703 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
704
705 r = neg ? -r : r;
706 #endif
707
708 return r;
709 }
710
711 /* convert a double to ieee double/binary64 */
712 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
713 ecb_function_ uint64_t
714 ecb_double_to_binary64 (double x)
715 {
716 uint64_t r;
717
718 #if ECB_STDFP
719 memcpy (&r, &x, 8);
720 #else
721 /* slow emulation, works for anything but -0 */
722 uint64_t m;
723 int e;
724
725 if (x == 0e0 ) return 0x0000000000000000U;
726 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
727 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
728 if (x != x ) return 0X7ff7ffffffffffffU;
729
730 m = frexp (x, &e) * 0x20000000000000U;
731
732 r = m & 0x8000000000000000;;
733
734 if (r)
735 m = -m;
736
737 if (e <= -1022)
738 {
739 m &= 0x1fffffffffffffU;
740 m >>= (-1021 - e);
741 e = -1022;
742 }
743
744 r |= ((uint64_t)(e + 1022)) << 52;
745 r |= m & 0xfffffffffffffU;
746 #endif
747
748 return r;
749 }
750
751 /* converts an ieee double/binary64 to a double */
752 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
753 ecb_function_ double
754 ecb_binary64_to_double (uint64_t x)
755 {
756 double r;
757
758 #if ECB_STDFP
759 memcpy (&r, &x, 8);
760 #else
761 /* emulation, only works for normals and subnormals and +0 */
762 int neg = x >> 63;
763 int e = (x >> 52) & 0x7ffU;
764
765 x &= 0xfffffffffffffU;
766
767 if (e)
768 x |= 0x10000000000000U;
769 else
770 e = 1;
771
772 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
773 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
774
775 r = neg ? -r : r;
776 #endif
777
778 return r;
779 }
780
781 #endif
782
783 #endif
784