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Revision: 1.132
Committed: Tue Mar 25 19:26:31 2014 UTC (10 years, 2 months ago) by root
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Branch: MAIN
Changes since 1.131: +1 -1 lines
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1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2014 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
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 __aarch64__
148 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
149 #elif (__sparc || __sparc__) && !__sparcv8
150 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
151 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
152 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
153 #elif defined __s390__ || defined __s390x__
154 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
155 #elif defined __mips__
156 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
157 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
158 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
159 #elif defined __alpha__
160 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
161 #elif defined __hppa__
162 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
163 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
164 #elif defined __ia64__
165 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
166 #elif defined __m68k__
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
168 #elif defined __m88k__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
170 #elif defined __sh__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
172 #endif
173 #endif
174 #endif
175
176 #ifndef ECB_MEMORY_FENCE
177 #if ECB_GCC_VERSION(4,7)
178 /* see comment below (stdatomic.h) about the C11 memory model. */
179 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
180 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
181 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
182
183 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
184 * without risking compile time errors with other compilers. We *could*
185 * define our own ecb_clang_has_feature, but I just can't be bothered to work
186 * around this shit time and again.
187 * #elif defined __clang && __has_feature (cxx_atomic)
188 * // see comment below (stdatomic.h) about the C11 memory model.
189 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
190 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
191 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
192 */
193
194 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
195 #define ECB_MEMORY_FENCE __sync_synchronize ()
196 #elif _MSC_VER >= 1500 /* VC++ 2008 */
197 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
198 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
199 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
200 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
201 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
202 #elif _MSC_VER >= 1400 /* VC++ 2005 */
203 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
204 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
205 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
206 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
207 #elif defined _WIN32
208 #include <WinNT.h>
209 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
210 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
211 #include <mbarrier.h>
212 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
213 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
214 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
215 #elif __xlC__
216 #define ECB_MEMORY_FENCE __sync ()
217 #endif
218 #endif
219
220 #ifndef ECB_MEMORY_FENCE
221 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
222 /* we assume that these memory fences work on all variables/all memory accesses, */
223 /* not just C11 atomics and atomic accesses */
224 #include <stdatomic.h>
225 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
226 /* any fence other than seq_cst, which isn't very efficient for us. */
227 /* Why that is, we don't know - either the C11 memory model is quite useless */
228 /* for most usages, or gcc and clang have a bug */
229 /* I *currently* lean towards the latter, and inefficiently implement */
230 /* all three of ecb's fences as a seq_cst fence */
231 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
232 /* for all __atomic_thread_fence's except seq_cst */
233 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
234 #endif
235 #endif
236
237 #ifndef ECB_MEMORY_FENCE
238 #if !ECB_AVOID_PTHREADS
239 /*
240 * if you get undefined symbol references to pthread_mutex_lock,
241 * or failure to find pthread.h, then you should implement
242 * the ECB_MEMORY_FENCE operations for your cpu/compiler
243 * OR provide pthread.h and link against the posix thread library
244 * of your system.
245 */
246 #include <pthread.h>
247 #define ECB_NEEDS_PTHREADS 1
248 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
249
250 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
251 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
252 #endif
253 #endif
254
255 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
256 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
257 #endif
258
259 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
260 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
261 #endif
262
263 /*****************************************************************************/
264
265 #if __cplusplus
266 #define ecb_inline static inline
267 #elif ECB_GCC_VERSION(2,5)
268 #define ecb_inline static __inline__
269 #elif ECB_C99
270 #define ecb_inline static inline
271 #else
272 #define ecb_inline static
273 #endif
274
275 #if ECB_GCC_VERSION(3,3)
276 #define ecb_restrict __restrict__
277 #elif ECB_C99
278 #define ecb_restrict restrict
279 #else
280 #define ecb_restrict
281 #endif
282
283 typedef int ecb_bool;
284
285 #define ECB_CONCAT_(a, b) a ## b
286 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
287 #define ECB_STRINGIFY_(a) # a
288 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
289
290 #define ecb_function_ ecb_inline
291
292 #if ECB_GCC_VERSION(3,1)
293 #define ecb_attribute(attrlist) __attribute__(attrlist)
294 #define ecb_is_constant(expr) __builtin_constant_p (expr)
295 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
296 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
297 #else
298 #define ecb_attribute(attrlist)
299
300 /* possible C11 impl for integral types
301 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
302 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
303
304 #define ecb_is_constant(expr) 0
305 #define ecb_expect(expr,value) (expr)
306 #define ecb_prefetch(addr,rw,locality)
307 #endif
308
309 /* no emulation for ecb_decltype */
310 #if ECB_GCC_VERSION(4,5)
311 #define ecb_decltype(x) __decltype(x)
312 #elif ECB_GCC_VERSION(3,0)
313 #define ecb_decltype(x) __typeof(x)
314 #endif
315
316 #define ecb_noinline ecb_attribute ((__noinline__))
317 #define ecb_unused ecb_attribute ((__unused__))
318 #define ecb_const ecb_attribute ((__const__))
319 #define ecb_pure ecb_attribute ((__pure__))
320
321 #if ECB_C11
322 #define ecb_noreturn _Noreturn
323 #else
324 #define ecb_noreturn ecb_attribute ((__noreturn__))
325 #endif
326
327 #if ECB_GCC_VERSION(4,3)
328 #define ecb_artificial ecb_attribute ((__artificial__))
329 #define ecb_hot ecb_attribute ((__hot__))
330 #define ecb_cold ecb_attribute ((__cold__))
331 #else
332 #define ecb_artificial
333 #define ecb_hot
334 #define ecb_cold
335 #endif
336
337 /* put around conditional expressions if you are very sure that the */
338 /* expression is mostly true or mostly false. note that these return */
339 /* booleans, not the expression. */
340 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
341 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
342 /* for compatibility to the rest of the world */
343 #define ecb_likely(expr) ecb_expect_true (expr)
344 #define ecb_unlikely(expr) ecb_expect_false (expr)
345
346 /* count trailing zero bits and count # of one bits */
347 #if ECB_GCC_VERSION(3,4)
348 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
349 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
350 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
351 #define ecb_ctz32(x) __builtin_ctz (x)
352 #define ecb_ctz64(x) __builtin_ctzll (x)
353 #define ecb_popcount32(x) __builtin_popcount (x)
354 /* no popcountll */
355 #else
356 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
357 ecb_function_ int
358 ecb_ctz32 (uint32_t x)
359 {
360 int r = 0;
361
362 x &= ~x + 1; /* this isolates the lowest bit */
363
364 #if ECB_branchless_on_i386
365 r += !!(x & 0xaaaaaaaa) << 0;
366 r += !!(x & 0xcccccccc) << 1;
367 r += !!(x & 0xf0f0f0f0) << 2;
368 r += !!(x & 0xff00ff00) << 3;
369 r += !!(x & 0xffff0000) << 4;
370 #else
371 if (x & 0xaaaaaaaa) r += 1;
372 if (x & 0xcccccccc) r += 2;
373 if (x & 0xf0f0f0f0) r += 4;
374 if (x & 0xff00ff00) r += 8;
375 if (x & 0xffff0000) r += 16;
376 #endif
377
378 return r;
379 }
380
381 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
382 ecb_function_ int
383 ecb_ctz64 (uint64_t x)
384 {
385 int shift = x & 0xffffffffU ? 0 : 32;
386 return ecb_ctz32 (x >> shift) + shift;
387 }
388
389 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
390 ecb_function_ int
391 ecb_popcount32 (uint32_t x)
392 {
393 x -= (x >> 1) & 0x55555555;
394 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
395 x = ((x >> 4) + x) & 0x0f0f0f0f;
396 x *= 0x01010101;
397
398 return x >> 24;
399 }
400
401 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
402 ecb_function_ int ecb_ld32 (uint32_t x)
403 {
404 int r = 0;
405
406 if (x >> 16) { x >>= 16; r += 16; }
407 if (x >> 8) { x >>= 8; r += 8; }
408 if (x >> 4) { x >>= 4; r += 4; }
409 if (x >> 2) { x >>= 2; r += 2; }
410 if (x >> 1) { r += 1; }
411
412 return r;
413 }
414
415 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
416 ecb_function_ int ecb_ld64 (uint64_t x)
417 {
418 int r = 0;
419
420 if (x >> 32) { x >>= 32; r += 32; }
421
422 return r + ecb_ld32 (x);
423 }
424 #endif
425
426 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
427 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
428 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
429 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
430
431 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
432 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
433 {
434 return ( (x * 0x0802U & 0x22110U)
435 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
436 }
437
438 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
439 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
440 {
441 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
442 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
443 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
444 x = ( x >> 8 ) | ( x << 8);
445
446 return x;
447 }
448
449 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
450 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
451 {
452 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
453 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
454 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
455 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
456 x = ( x >> 16 ) | ( x << 16);
457
458 return x;
459 }
460
461 /* popcount64 is only available on 64 bit cpus as gcc builtin */
462 /* so for this version we are lazy */
463 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
464 ecb_function_ int
465 ecb_popcount64 (uint64_t x)
466 {
467 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
468 }
469
470 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
471 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
472 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
473 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
474 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
475 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
476 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
477 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
478
479 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
480 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
481 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
482 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
483 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
484 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
485 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
486 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
487
488 #if ECB_GCC_VERSION(4,3)
489 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
490 #define ecb_bswap32(x) __builtin_bswap32 (x)
491 #define ecb_bswap64(x) __builtin_bswap64 (x)
492 #else
493 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
494 ecb_function_ uint16_t
495 ecb_bswap16 (uint16_t x)
496 {
497 return ecb_rotl16 (x, 8);
498 }
499
500 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
501 ecb_function_ uint32_t
502 ecb_bswap32 (uint32_t x)
503 {
504 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
505 }
506
507 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
508 ecb_function_ uint64_t
509 ecb_bswap64 (uint64_t x)
510 {
511 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
512 }
513 #endif
514
515 #if ECB_GCC_VERSION(4,5)
516 #define ecb_unreachable() __builtin_unreachable ()
517 #else
518 /* this seems to work fine, but gcc always emits a warning for it :/ */
519 ecb_inline void ecb_unreachable (void) ecb_noreturn;
520 ecb_inline void ecb_unreachable (void) { }
521 #endif
522
523 /* try to tell the compiler that some condition is definitely true */
524 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
525
526 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
527 ecb_inline unsigned char
528 ecb_byteorder_helper (void)
529 {
530 /* the union code still generates code under pressure in gcc, */
531 /* but less than using pointers, and always seems to */
532 /* successfully return a constant. */
533 /* the reason why we have this horrible preprocessor mess */
534 /* is to avoid it in all cases, at least on common architectures */
535 /* or when using a recent enough gcc version (>= 4.6) */
536 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
537 return 0x44;
538 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
539 return 0x44;
540 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
541 return 0x11;
542 #else
543 union
544 {
545 uint32_t i;
546 uint8_t c;
547 } u = { 0x11223344 };
548 return u.c;
549 #endif
550 }
551
552 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
553 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
554 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
555 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
556
557 #if ECB_GCC_VERSION(3,0) || ECB_C99
558 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
559 #else
560 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
561 #endif
562
563 #if __cplusplus
564 template<typename T>
565 static inline T ecb_div_rd (T val, T div)
566 {
567 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
568 }
569 template<typename T>
570 static inline T ecb_div_ru (T val, T div)
571 {
572 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
573 }
574 #else
575 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
576 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
577 #endif
578
579 #if ecb_cplusplus_does_not_suck
580 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
581 template<typename T, int N>
582 static inline int ecb_array_length (const T (&arr)[N])
583 {
584 return N;
585 }
586 #else
587 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
588 #endif
589
590 /*******************************************************************************/
591 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
592
593 /* basically, everything uses "ieee pure-endian" floating point numbers */
594 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
595 #if 0 \
596 || __i386 || __i386__ \
597 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
598 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
599 || defined __s390__ || defined __s390x__ \
600 || defined __mips__ \
601 || defined __alpha__ \
602 || defined __hppa__ \
603 || defined __ia64__ \
604 || defined __m68k__ \
605 || defined __m88k__ \
606 || defined __sh__ \
607 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
608 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
609 || defined __aarch64__
610 #define ECB_STDFP 1
611 #include <string.h> /* for memcpy */
612 #else
613 #define ECB_STDFP 0
614 #endif
615
616 #ifndef ECB_NO_LIBM
617
618 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
619
620 /* only the oldest of old doesn't have this one. solaris. */
621 #ifdef INFINITY
622 #define ECB_INFINITY INFINITY
623 #else
624 #define ECB_INFINITY HUGE_VAL
625 #endif
626
627 #ifdef NAN
628 #define ECB_NAN NAN
629 #else
630 #define ECB_NAN ECB_INFINITY
631 #endif
632
633 /* converts an ieee half/binary16 to a float */
634 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
635 ecb_function_ float
636 ecb_binary16_to_float (uint16_t x)
637 {
638 int e = (x >> 10) & 0x1f;
639 int m = x & 0x3ff;
640 float r;
641
642 if (!e ) r = ldexpf (m , -24);
643 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
644 else if (m ) r = ECB_NAN;
645 else r = ECB_INFINITY;
646
647 return x & 0x8000 ? -r : r;
648 }
649
650 /* convert a float to ieee single/binary32 */
651 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
652 ecb_function_ uint32_t
653 ecb_float_to_binary32 (float x)
654 {
655 uint32_t r;
656
657 #if ECB_STDFP
658 memcpy (&r, &x, 4);
659 #else
660 /* slow emulation, works for anything but -0 */
661 uint32_t m;
662 int e;
663
664 if (x == 0e0f ) return 0x00000000U;
665 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
666 if (x < -3.40282346638528860e+38f) return 0xff800000U;
667 if (x != x ) return 0x7fbfffffU;
668
669 m = frexpf (x, &e) * 0x1000000U;
670
671 r = m & 0x80000000U;
672
673 if (r)
674 m = -m;
675
676 if (e <= -126)
677 {
678 m &= 0xffffffU;
679 m >>= (-125 - e);
680 e = -126;
681 }
682
683 r |= (e + 126) << 23;
684 r |= m & 0x7fffffU;
685 #endif
686
687 return r;
688 }
689
690 /* converts an ieee single/binary32 to a float */
691 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
692 ecb_function_ float
693 ecb_binary32_to_float (uint32_t x)
694 {
695 float r;
696
697 #if ECB_STDFP
698 memcpy (&r, &x, 4);
699 #else
700 /* emulation, only works for normals and subnormals and +0 */
701 int neg = x >> 31;
702 int e = (x >> 23) & 0xffU;
703
704 x &= 0x7fffffU;
705
706 if (e)
707 x |= 0x800000U;
708 else
709 e = 1;
710
711 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
712 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
713
714 r = neg ? -r : r;
715 #endif
716
717 return r;
718 }
719
720 /* convert a double to ieee double/binary64 */
721 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
722 ecb_function_ uint64_t
723 ecb_double_to_binary64 (double x)
724 {
725 uint64_t r;
726
727 #if ECB_STDFP
728 memcpy (&r, &x, 8);
729 #else
730 /* slow emulation, works for anything but -0 */
731 uint64_t m;
732 int e;
733
734 if (x == 0e0 ) return 0x0000000000000000U;
735 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
736 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
737 if (x != x ) return 0X7ff7ffffffffffffU;
738
739 m = frexp (x, &e) * 0x20000000000000U;
740
741 r = m & 0x8000000000000000;;
742
743 if (r)
744 m = -m;
745
746 if (e <= -1022)
747 {
748 m &= 0x1fffffffffffffU;
749 m >>= (-1021 - e);
750 e = -1022;
751 }
752
753 r |= ((uint64_t)(e + 1022)) << 52;
754 r |= m & 0xfffffffffffffU;
755 #endif
756
757 return r;
758 }
759
760 /* converts an ieee double/binary64 to a double */
761 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
762 ecb_function_ double
763 ecb_binary64_to_double (uint64_t x)
764 {
765 double r;
766
767 #if ECB_STDFP
768 memcpy (&r, &x, 8);
769 #else
770 /* emulation, only works for normals and subnormals and +0 */
771 int neg = x >> 63;
772 int e = (x >> 52) & 0x7ffU;
773
774 x &= 0xfffffffffffffU;
775
776 if (e)
777 x |= 0x10000000000000U;
778 else
779 e = 1;
780
781 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
782 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
783
784 r = neg ? -r : r;
785 #endif
786
787 return r;
788 }
789
790 #endif
791
792 #endif
793