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Comparing libecb/ecb.h (file contents):
Revision 1.4 by root, Thu May 26 17:26:03 2011 UTC vs.
Revision 1.138 by sf-exg, Tue Oct 14 14:38:13 2014 UTC

1/* 1/*
2 * libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann 4 * Copyright (©) 2009-2014 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
5 * All rights reserved. 6 * All rights reserved.
6 * 7 *
7 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
9 * 10 *
… …
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE. 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.
27 */ 39 */
28 40
29#ifndef ECB_H 41#ifndef ECB_H
30#define ECB_H 42#define ECB_H
31 43
44/* 16 bits major, 16 bits minor */
45#define ECB_VERSION 0x00010003
46
47#ifdef _WIN32
48 typedef signed char int8_t;
49 typedef unsigned char uint8_t;
50 typedef signed short int16_t;
51 typedef unsigned short uint16_t;
52 typedef signed int int32_t;
53 typedef unsigned int uint32_t;
54 #if __GNUC__
55 typedef signed long long int64_t;
56 typedef unsigned long long uint64_t;
57 #else /* _MSC_VER || __BORLANDC__ */
58 typedef signed __int64 int64_t;
59 typedef unsigned __int64 uint64_t;
60 #endif
61 #ifdef _WIN64
62 #define ECB_PTRSIZE 8
63 typedef uint64_t uintptr_t;
64 typedef int64_t intptr_t;
65 #else
66 #define ECB_PTRSIZE 4
67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t;
69 #endif
70#else
71 #include <inttypes.h>
72 #if UINTMAX_MAX > 0xffffffffU
73 #define ECB_PTRSIZE 8
74 #else
75 #define ECB_PTRSIZE 4
76 #endif
77#endif
78
79/* work around x32 idiocy by defining proper macros */
80#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
85 #endif
86#endif
87
88/* many compilers define _GNUC_ to some versions but then only implement
89 * what their idiot authors think are the "more important" extensions,
90 * causing enormous grief in return for some better fake benchmark numbers.
91 * or so.
92 * we try to detect these and simply assume they are not gcc - if they have
93 * an issue with that they should have done it right in the first place.
94 */
95#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
96 #define ECB_GCC_VERSION(major,minor) 0
97#else
32#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 98 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
99#endif
33 100
34#ifndef __cplusplus 101#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
35# if __STDC_VERSION__ >= 199901L 102
36# define ECB_INLINE inline 103#if __clang__ && defined(__has_builtin)
37typedef _Bool ecb_bool; 104 #define ECB_CLANG_BUILTIN(x) __has_builtin(x)
38# else 105#else
39# define ECB_INLINE inline /* yeah! */ 106 #define ECB_CLANG_BUILTIN(x) 0
107#endif
108
109#define ECB_CPP (__cplusplus+0)
110#define ECB_CPP11 (__cplusplus >= 201103L)
111
112#if ECB_CPP
113 #define ECB_C 0
114 #define ECB_STDC_VERSION 0
115#else
116 #define ECB_C 1
117 #define ECB_STDC_VERSION __STDC_VERSION__
118#endif
119
120#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
121#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
122
123#if ECB_CPP
124 #define ECB_EXTERN_C extern "C"
125 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
126 #define ECB_EXTERN_C_END }
127#else
128 #define ECB_EXTERN_C extern
129 #define ECB_EXTERN_C_BEG
130 #define ECB_EXTERN_C_END
131#endif
132
133/*****************************************************************************/
134
135/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
136/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
137
138#if ECB_NO_THREADS
139 #define ECB_NO_SMP 1
140#endif
141
142#if ECB_NO_SMP
143 #define ECB_MEMORY_FENCE do { } while (0)
144#endif
145
146#ifndef ECB_MEMORY_FENCE
147 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
148 #if __i386 || __i386__
149 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
150 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
151 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
152 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
153 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
154 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
155 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
156 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
157 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
158 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
159 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
160 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
161 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
162 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
164 #elif __aarch64__
165 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
166 #elif (__sparc || __sparc__) && !__sparcv8
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
168 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
169 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
170 #elif defined __s390__ || defined __s390x__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
172 #elif defined __mips__
173 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
174 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
175 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
176 #elif defined __alpha__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
178 #elif defined __hppa__
179 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
180 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
181 #elif defined __ia64__
182 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
183 #elif defined __m68k__
184 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
185 #elif defined __m88k__
186 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
187 #elif defined __sh__
188 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
189 #endif
190 #endif
191#endif
192
193#ifndef ECB_MEMORY_FENCE
194 #if ECB_GCC_VERSION(4,7)
195 /* see comment below (stdatomic.h) about the C11 memory model. */
196 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
197 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
198 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
199
200 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
201 * without risking compile time errors with other compilers. We *could*
202 * define our own ecb_clang_has_feature, but I just can't be bothered to work
203 * around this shit time and again.
204 * #elif defined __clang && __has_feature (cxx_atomic)
205 * // see comment below (stdatomic.h) about the C11 memory model.
206 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
207 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
208 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
209 */
210
211 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
212 #define ECB_MEMORY_FENCE __sync_synchronize ()
213 #elif _MSC_VER >= 1500 /* VC++ 2008 */
214 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
215 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
216 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
217 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
218 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
219 #elif _MSC_VER >= 1400 /* VC++ 2005 */
220 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
221 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
222 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
223 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
224 #elif defined _WIN32
225 #include <WinNT.h>
226 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
227 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
228 #include <mbarrier.h>
229 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
230 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
231 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
232 #elif __xlC__
233 #define ECB_MEMORY_FENCE __sync ()
234 #endif
235#endif
236
237#ifndef ECB_MEMORY_FENCE
238 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
239 /* we assume that these memory fences work on all variables/all memory accesses, */
240 /* not just C11 atomics and atomic accesses */
241 #include <stdatomic.h>
242 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
243 /* any fence other than seq_cst, which isn't very efficient for us. */
244 /* Why that is, we don't know - either the C11 memory model is quite useless */
245 /* for most usages, or gcc and clang have a bug */
246 /* I *currently* lean towards the latter, and inefficiently implement */
247 /* all three of ecb's fences as a seq_cst fence */
248 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
249 /* for all __atomic_thread_fence's except seq_cst */
250 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
251 #endif
252#endif
253
254#ifndef ECB_MEMORY_FENCE
255 #if !ECB_AVOID_PTHREADS
256 /*
257 * if you get undefined symbol references to pthread_mutex_lock,
258 * or failure to find pthread.h, then you should implement
259 * the ECB_MEMORY_FENCE operations for your cpu/compiler
260 * OR provide pthread.h and link against the posix thread library
261 * of your system.
262 */
263 #include <pthread.h>
264 #define ECB_NEEDS_PTHREADS 1
265 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
266
267 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
268 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
269 #endif
270#endif
271
272#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
273 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
274#endif
275
276#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
277 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
278#endif
279
280/*****************************************************************************/
281
282#if __cplusplus
283 #define ecb_inline static inline
284#elif ECB_GCC_VERSION(2,5)
285 #define ecb_inline static __inline__
286#elif ECB_C99
287 #define ecb_inline static inline
288#else
289 #define ecb_inline static
290#endif
291
292#if ECB_GCC_VERSION(3,3)
293 #define ecb_restrict __restrict__
294#elif ECB_C99
295 #define ecb_restrict restrict
296#else
297 #define ecb_restrict
298#endif
299
40typedef int ecb_bool; 300typedef int ecb_bool;
41# endif
42#endif
43 301
44#define ECB_HEADER_INLINE static ECB_INLINE 302#define ECB_CONCAT_(a, b) a ## b
303#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
304#define ECB_STRINGIFY_(a) # a
305#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
45 306
46#if ECB_GCC_VERSION(3,1) 307#define ecb_function_ ecb_inline
308
309#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
47# define ecb_attribute(attrlist) __attribute__(attrlist) 310 #define ecb_attribute(attrlist) __attribute__(attrlist)
311#else
312 #define ecb_attribute(attrlist)
313#endif
314
315#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
48# define ecb_is_constant(c) __builtin_constant_p (c) 316 #define ecb_is_constant(expr) __builtin_constant_p (expr)
317#else
318 /* possible C11 impl for integral types
319 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
320 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
321
322 #define ecb_is_constant(expr) 0
323#endif
324
325#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
49# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 326 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
327#else
328 #define ecb_expect(expr,value) (expr)
329#endif
330
331#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
50# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 332 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
51#else 333#else
52# define ecb_attribute(attrlist)
53# define ecb_is_constant(c) 0
54# define ecb_expect(expr,value) (expr)
55# define ecb_prefetch(addr,rw,locality) 334 #define ecb_prefetch(addr,rw,locality)
56#endif 335#endif
57 336
58/* no emulation for ecb_decltype */ 337/* no emulation for ecb_decltype */
59#if ECB_GCC_VERSION(4,5) 338#if ECB_GCC_VERSION(4,5)
60# define ecb_decltype(x) __decltype(x) 339 #define ecb_decltype(x) __decltype(x)
61#elif ECB_GCC_VERSION(3,0) 340#elif ECB_GCC_VERSION(3,0)
62# define ecb_decltype(x) typeof(x) 341 #define ecb_decltype(x) __typeof(x)
63#endif 342#endif
64 343
344#if _MSC_VER >= 1300
345 #define ecb_deprecated __declspec(deprecated)
346#else
347 #define ecb_deprecated ecb_attribute ((__deprecated__))
348#endif
349
65#define ecb_noinline ecb_attribute ((noinline)) 350#define ecb_noinline ecb_attribute ((__noinline__))
66#define ecb_noreturn ecb_attribute ((noreturn))
67#define ecb_unused ecb_attribute ((unused)) 351#define ecb_unused ecb_attribute ((__unused__))
68#define ecb_const ecb_attribute ((const)) 352#define ecb_const ecb_attribute ((__const__))
69#define ecb_pure ecb_attribute ((pure)) 353#define ecb_pure ecb_attribute ((__pure__))
70#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
71#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
72 354
355/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
356#if ECB_C11
357 #define ecb_noreturn _Noreturn
358#else
359 #define ecb_noreturn ecb_attribute ((__noreturn__))
360#endif
361
73#if ECB_GCC_VERSION(4,5) 362#if ECB_GCC_VERSION(4,3)
363 #define ecb_artificial ecb_attribute ((__artificial__))
364 #define ecb_hot ecb_attribute ((__hot__))
365 #define ecb_cold ecb_attribute ((__cold__))
366#else
367 #define ecb_artificial
368 #define ecb_hot
369 #define ecb_cold
370#endif
371
372/* put around conditional expressions if you are very sure that the */
373/* expression is mostly true or mostly false. note that these return */
374/* booleans, not the expression. */
375#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
376#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
377/* for compatibility to the rest of the world */
378#define ecb_likely(expr) ecb_expect_true (expr)
379#define ecb_unlikely(expr) ecb_expect_false (expr)
380
381/* count trailing zero bits and count # of one bits */
382#if ECB_GCC_VERSION(3,4) || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
383 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
384 && ECB_CLANG_BUILTIN(__builtin_popcount))
385 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
386 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
387 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
388 #define ecb_ctz32(x) __builtin_ctz (x)
389 #define ecb_ctz64(x) __builtin_ctzll (x)
390 #define ecb_popcount32(x) __builtin_popcount (x)
391 /* no popcountll */
392#else
393 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
394 ecb_function_ int
395 ecb_ctz32 (uint32_t x)
396 {
397 int r = 0;
398
399 x &= ~x + 1; /* this isolates the lowest bit */
400
401#if ECB_branchless_on_i386
402 r += !!(x & 0xaaaaaaaa) << 0;
403 r += !!(x & 0xcccccccc) << 1;
404 r += !!(x & 0xf0f0f0f0) << 2;
405 r += !!(x & 0xff00ff00) << 3;
406 r += !!(x & 0xffff0000) << 4;
407#else
408 if (x & 0xaaaaaaaa) r += 1;
409 if (x & 0xcccccccc) r += 2;
410 if (x & 0xf0f0f0f0) r += 4;
411 if (x & 0xff00ff00) r += 8;
412 if (x & 0xffff0000) r += 16;
413#endif
414
415 return r;
416 }
417
418 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
419 ecb_function_ int
420 ecb_ctz64 (uint64_t x)
421 {
422 int shift = x & 0xffffffffU ? 0 : 32;
423 return ecb_ctz32 (x >> shift) + shift;
424 }
425
426 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
427 ecb_function_ int
428 ecb_popcount32 (uint32_t x)
429 {
430 x -= (x >> 1) & 0x55555555;
431 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
432 x = ((x >> 4) + x) & 0x0f0f0f0f;
433 x *= 0x01010101;
434
435 return x >> 24;
436 }
437
438 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
439 ecb_function_ int ecb_ld32 (uint32_t x)
440 {
441 int r = 0;
442
443 if (x >> 16) { x >>= 16; r += 16; }
444 if (x >> 8) { x >>= 8; r += 8; }
445 if (x >> 4) { x >>= 4; r += 4; }
446 if (x >> 2) { x >>= 2; r += 2; }
447 if (x >> 1) { r += 1; }
448
449 return r;
450 }
451
452 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
453 ecb_function_ int ecb_ld64 (uint64_t x)
454 {
455 int r = 0;
456
457 if (x >> 32) { x >>= 32; r += 32; }
458
459 return r + ecb_ld32 (x);
460 }
461#endif
462
463ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
464ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
465ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
466ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
467
468ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
469ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
470{
471 return ( (x * 0x0802U & 0x22110U)
472 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
473}
474
475ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
476ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
477{
478 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
479 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
480 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
481 x = ( x >> 8 ) | ( x << 8);
482
483 return x;
484}
485
486ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
487ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
488{
489 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
490 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
491 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
492 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
493 x = ( x >> 16 ) | ( x << 16);
494
495 return x;
496}
497
498/* popcount64 is only available on 64 bit cpus as gcc builtin */
499/* so for this version we are lazy */
500ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
501ecb_function_ int
502ecb_popcount64 (uint64_t x)
503{
504 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
505}
506
507ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
508ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
509ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
510ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
511ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
512ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
513ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
514ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
515
516ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
517ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
518ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
519ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
520ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
521ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
522ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
523ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
524
525#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
526 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
527 #define ecb_bswap32(x) __builtin_bswap32 (x)
528 #define ecb_bswap64(x) __builtin_bswap64 (x)
529#else
530 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
531 ecb_function_ uint16_t
532 ecb_bswap16 (uint16_t x)
533 {
534 return ecb_rotl16 (x, 8);
535 }
536
537 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
538 ecb_function_ uint32_t
539 ecb_bswap32 (uint32_t x)
540 {
541 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
542 }
543
544 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
545 ecb_function_ uint64_t
546 ecb_bswap64 (uint64_t x)
547 {
548 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
549 }
550#endif
551
552#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
74# define ecb_unreachable() __builtin_unreachable () 553 #define ecb_unreachable() __builtin_unreachable ()
75#else 554#else
76/* this seems to work fine, but gcc always emits a warning for it :/ */ 555 /* this seems to work fine, but gcc always emits a warning for it :/ */
77ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 556 ecb_inline void ecb_unreachable (void) ecb_noreturn;
78ECB_HEADER_INLINE void ecb_unreachable () { } 557 ecb_inline void ecb_unreachable (void) { }
79#endif 558#endif
80
81/* put into ifs if you are very sure that the expression */
82/* is mostly true or mosty false. note that these return */
83/* booleans, not the expression. */
84#define ecb_expect_false(expr) ecb_expect ((expr) ? 1 : 0, 0)
85#define ecb_expect_true(expr) ecb_expect ((expr) ? 1 : 0, 1)
86 559
87/* try to tell the compiler that some condition is definitely true */ 560/* try to tell the compiler that some condition is definitely true */
88#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 561#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
89 562
90/* count trailing zero bits and count # of one bits */ 563ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
91#if ECB_GCC_VERSION(3,4) 564ecb_inline unsigned char
92ECB_HEADER_INLINE int ecb_ctz32 (unsigned int x) { return __builtin_ctz (x); } 565ecb_byteorder_helper (void)
93ECB_HEADER_INLINE int ecb_popcount32 (unsigned int x) { return __builtin_popcount (x); }
94#else
95ECB_HEADER_INLINE
96ecb_ctz32 (unsigned int x) ecb_const
97{ 566{
98 int r = 0; 567 /* the union code still generates code under pressure in gcc, */
99 568 /* but less than using pointers, and always seems to */
100 x &= -x; /* this isolates the lowest bit */ 569 /* successfully return a constant. */
101 570 /* the reason why we have this horrible preprocessor mess */
102 if (x & 0xaaaaaaaa) r += 1; 571 /* is to avoid it in all cases, at least on common architectures */
103 if (x & 0xcccccccc) r += 2; 572 /* or when using a recent enough gcc version (>= 4.6) */
104 if (x & 0xf0f0f0f0) r += 4; 573#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
105 if (x & 0xff00ff00) r += 8; 574 return 0x44;
106 if (x & 0xffff0000) r += 16; 575#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
107 576 return 0x44;
577#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
578 return 0x11;
579#else
580 union
581 {
582 uint32_t i;
583 uint8_t c;
584 } u = { 0x11223344 };
108 return r; 585 return u.c;
586#endif
109} 587}
110 588
111ECB_HEADER_INLINE 589ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
112ecb_popcount32 (unsigned int x) ecb_const 590ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
113{ 591ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
114 x -= (x >> 1) & 0x55555555; 592ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
115 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
116 x = ((x >> 4) + x) & 0x0f0f0f0f;
117 x *= 0x01010101;
118 593
119 return x >> 24; 594#if ECB_GCC_VERSION(3,0) || ECB_C99
120} 595 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
596#else
597 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
598#endif
599
600#if __cplusplus
601 template<typename T>
602 static inline T ecb_div_rd (T val, T div)
603 {
604 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
605 }
606 template<typename T>
607 static inline T ecb_div_ru (T val, T div)
608 {
609 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
610 }
611#else
612 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
613 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
614#endif
615
616#if ecb_cplusplus_does_not_suck
617 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
618 template<typename T, int N>
619 static inline int ecb_array_length (const T (&arr)[N])
620 {
621 return N;
622 }
623#else
624 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
625#endif
626
627/*******************************************************************************/
628/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
629
630/* basically, everything uses "ieee pure-endian" floating point numbers */
631/* the only noteworthy exception is ancient armle, which uses order 43218765 */
632#if 0 \
633 || __i386 || __i386__ \
634 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
635 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
636 || defined __s390__ || defined __s390x__ \
637 || defined __mips__ \
638 || defined __alpha__ \
639 || defined __hppa__ \
640 || defined __ia64__ \
641 || defined __m68k__ \
642 || defined __m88k__ \
643 || defined __sh__ \
644 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
645 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
646 || defined __aarch64__
647 #define ECB_STDFP 1
648 #include <string.h> /* for memcpy */
649#else
650 #define ECB_STDFP 0
651#endif
652
653#ifndef ECB_NO_LIBM
654
655 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
656
657 /* only the oldest of old doesn't have this one. solaris. */
658 #ifdef INFINITY
659 #define ECB_INFINITY INFINITY
660 #else
661 #define ECB_INFINITY HUGE_VAL
121#endif 662 #endif
122 663
123ECB_HEADER_INLINE unsigned char 664 #ifdef NAN
124ecb_byteorder_helper () ecb_const 665 #define ECB_NAN NAN
125{ 666 #else
126 const uint32_t u = 0x11223344; 667 #define ECB_NAN ECB_INFINITY
127 return *(unsigned char *)&u;
128}
129
130ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; };
131ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; };
132
133#endif 668 #endif
134 669
670 /* converts an ieee half/binary16 to a float */
671 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
672 ecb_function_ float
673 ecb_binary16_to_float (uint16_t x)
674 {
675 int e = (x >> 10) & 0x1f;
676 int m = x & 0x3ff;
677 float r;
678
679 if (!e ) r = ldexpf (m , -24);
680 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
681 else if (m ) r = ECB_NAN;
682 else r = ECB_INFINITY;
683
684 return x & 0x8000 ? -r : r;
685 }
686
687 /* convert a float to ieee single/binary32 */
688 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
689 ecb_function_ uint32_t
690 ecb_float_to_binary32 (float x)
691 {
692 uint32_t r;
693
694 #if ECB_STDFP
695 memcpy (&r, &x, 4);
696 #else
697 /* slow emulation, works for anything but -0 */
698 uint32_t m;
699 int e;
700
701 if (x == 0e0f ) return 0x00000000U;
702 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
703 if (x < -3.40282346638528860e+38f) return 0xff800000U;
704 if (x != x ) return 0x7fbfffffU;
705
706 m = frexpf (x, &e) * 0x1000000U;
707
708 r = m & 0x80000000U;
709
710 if (r)
711 m = -m;
712
713 if (e <= -126)
714 {
715 m &= 0xffffffU;
716 m >>= (-125 - e);
717 e = -126;
718 }
719
720 r |= (e + 126) << 23;
721 r |= m & 0x7fffffU;
722 #endif
723
724 return r;
725 }
726
727 /* converts an ieee single/binary32 to a float */
728 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
729 ecb_function_ float
730 ecb_binary32_to_float (uint32_t x)
731 {
732 float r;
733
734 #if ECB_STDFP
735 memcpy (&r, &x, 4);
736 #else
737 /* emulation, only works for normals and subnormals and +0 */
738 int neg = x >> 31;
739 int e = (x >> 23) & 0xffU;
740
741 x &= 0x7fffffU;
742
743 if (e)
744 x |= 0x800000U;
745 else
746 e = 1;
747
748 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
749 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
750
751 r = neg ? -r : r;
752 #endif
753
754 return r;
755 }
756
757 /* convert a double to ieee double/binary64 */
758 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
759 ecb_function_ uint64_t
760 ecb_double_to_binary64 (double x)
761 {
762 uint64_t r;
763
764 #if ECB_STDFP
765 memcpy (&r, &x, 8);
766 #else
767 /* slow emulation, works for anything but -0 */
768 uint64_t m;
769 int e;
770
771 if (x == 0e0 ) return 0x0000000000000000U;
772 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
773 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
774 if (x != x ) return 0X7ff7ffffffffffffU;
775
776 m = frexp (x, &e) * 0x20000000000000U;
777
778 r = m & 0x8000000000000000;;
779
780 if (r)
781 m = -m;
782
783 if (e <= -1022)
784 {
785 m &= 0x1fffffffffffffU;
786 m >>= (-1021 - e);
787 e = -1022;
788 }
789
790 r |= ((uint64_t)(e + 1022)) << 52;
791 r |= m & 0xfffffffffffffU;
792 #endif
793
794 return r;
795 }
796
797 /* converts an ieee double/binary64 to a double */
798 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
799 ecb_function_ double
800 ecb_binary64_to_double (uint64_t x)
801 {
802 double r;
803
804 #if ECB_STDFP
805 memcpy (&r, &x, 8);
806 #else
807 /* emulation, only works for normals and subnormals and +0 */
808 int neg = x >> 63;
809 int e = (x >> 52) & 0x7ffU;
810
811 x &= 0xfffffffffffffU;
812
813 if (e)
814 x |= 0x10000000000000U;
815 else
816 e = 1;
817
818 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
819 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
820
821 r = neg ? -r : r;
822 #endif
823
824 return r;
825 }
826
827#endif
828
829#endif
830

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