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Comparing libecb/ecb.h (file contents):
Revision 1.130 by root, Fri Mar 21 16:40:45 2014 UTC vs.
Revision 1.160 by sf-exg, Thu Mar 19 15:43:51 2015 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2014 Marc Alexander Lehmann <libecb@schmorp.de> 4 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * 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-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
23 * 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;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 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 26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * 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.
28 */ 39 */
29 40
30#ifndef ECB_H 41#ifndef ECB_H
31#define ECB_H 42#define ECB_H
32 43
33/* 16 bits major, 16 bits minor */ 44/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010003 45#define ECB_VERSION 0x00010004
35 46
36#ifdef _WIN32 47#ifdef _WIN32
37 typedef signed char int8_t; 48 typedef signed char int8_t;
38 typedef unsigned char uint8_t; 49 typedef unsigned char uint8_t;
39 typedef signed short int16_t; 50 typedef signed short int16_t;
… …
63 #else 74 #else
64 #define ECB_PTRSIZE 4 75 #define ECB_PTRSIZE 4
65 #endif 76 #endif
66#endif 77#endif
67 78
79#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
80#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
81
68/* work around x32 idiocy by defining proper macros */ 82/* work around x32 idiocy by defining proper macros */
69#if __amd64 || __x86_64 || _M_AMD64 || _M_X64 83#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
70 #if _ILP32 84 #if _ILP32
71 #define ECB_AMD64_X32 1 85 #define ECB_AMD64_X32 1
72 #else 86 #else
73 #define ECB_AMD64 1 87 #define ECB_AMD64 1
74 #endif 88 #endif
… …
79 * causing enormous grief in return for some better fake benchmark numbers. 93 * causing enormous grief in return for some better fake benchmark numbers.
80 * or so. 94 * or so.
81 * we try to detect these and simply assume they are not gcc - if they have 95 * 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. 96 * an issue with that they should have done it right in the first place.
83 */ 97 */
84#ifndef ECB_GCC_VERSION
85 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ 98#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 99 #define ECB_GCC_VERSION(major,minor) 0
87 #else 100#else
88 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 101 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
89 #endif 102#endif
103
104#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
105
106#if __clang__ && defined __has_builtin
107 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
108#else
109 #define ECB_CLANG_BUILTIN(x) 0
110#endif
111
112#if __clang__ && defined __has_extension
113 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
114#else
115 #define ECB_CLANG_EXTENSION(x) 0
90#endif 116#endif
91 117
92#define ECB_CPP (__cplusplus+0) 118#define ECB_CPP (__cplusplus+0)
93#define ECB_CPP11 (__cplusplus >= 201103L) 119#define ECB_CPP11 (__cplusplus >= 201103L)
94 120
… …
130 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 156 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
131 #if __i386 || __i386__ 157 #if __i386 || __i386__
132 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 158 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
133 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") 159 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
134 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 160 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
135 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 161 #elif ECB_GCC_AMD64
136 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 162 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
137 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") 163 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
138 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 164 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
139 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 165 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
140 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 166 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
… …
178 /* see comment below (stdatomic.h) about the C11 memory model. */ 204 /* see comment below (stdatomic.h) about the C11 memory model. */
179 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 205 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
180 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE) 206 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
181 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE) 207 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
182 208
183 /* The __has_feature syntax from clang is so misdesigned that we cannot use it 209 #elif ECB_CLANG_EXTENSION(c_atomic)
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. 210 /* see comment below (stdatomic.h) about the C11 memory model. */
189 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 211 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
190 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE) 212 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
191 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE) 213 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
192 */
193 214
194 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 215 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
195 #define ECB_MEMORY_FENCE __sync_synchronize () 216 #define ECB_MEMORY_FENCE __sync_synchronize ()
196 #elif _MSC_VER >= 1500 /* VC++ 2008 */ 217 #elif _MSC_VER >= 1500 /* VC++ 2008 */
197 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */ 218 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
… …
260 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 281 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
261#endif 282#endif
262 283
263/*****************************************************************************/ 284/*****************************************************************************/
264 285
265#if __cplusplus 286#if ECB_CPP
266 #define ecb_inline static inline 287 #define ecb_inline static inline
267#elif ECB_GCC_VERSION(2,5) 288#elif ECB_GCC_VERSION(2,5)
268 #define ecb_inline static __inline__ 289 #define ecb_inline static __inline__
269#elif ECB_C99 290#elif ECB_C99
270 #define ecb_inline static inline 291 #define ecb_inline static inline
… …
284 305
285#define ECB_CONCAT_(a, b) a ## b 306#define ECB_CONCAT_(a, b) a ## b
286#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 307#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
287#define ECB_STRINGIFY_(a) # a 308#define ECB_STRINGIFY_(a) # a
288#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 309#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
310#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
289 311
290#define ecb_function_ ecb_inline 312#define ecb_function_ ecb_inline
291 313
292#if ECB_GCC_VERSION(3,1) 314#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
293 #define ecb_attribute(attrlist) __attribute__(attrlist) 315 #define ecb_attribute(attrlist) __attribute__ (attrlist)
316#else
317 #define ecb_attribute(attrlist)
318#endif
319
320#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
294 #define ecb_is_constant(expr) __builtin_constant_p (expr) 321 #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 322#else
298 #define ecb_attribute(attrlist)
299
300 /* possible C11 impl for integral types 323 /* possible C11 impl for integral types
301 typedef struct ecb_is_constant_struct ecb_is_constant_struct; 324 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)) */ 325 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
303 326
304 #define ecb_is_constant(expr) 0 327 #define ecb_is_constant(expr) 0
328#endif
329
330#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
331 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
332#else
305 #define ecb_expect(expr,value) (expr) 333 #define ecb_expect(expr,value) (expr)
334#endif
335
336#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
337 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
338#else
306 #define ecb_prefetch(addr,rw,locality) 339 #define ecb_prefetch(addr,rw,locality)
307#endif 340#endif
308 341
309/* no emulation for ecb_decltype */ 342/* no emulation for ecb_decltype */
310#if ECB_GCC_VERSION(4,5) 343#if ECB_CPP11
344 // older implementations might have problems with decltype(x)::type, work around it
345 template<class T> struct ecb_decltype_t { typedef T type; };
311 #define ecb_decltype(x) __decltype(x) 346 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
312#elif ECB_GCC_VERSION(3,0) 347#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
313 #define ecb_decltype(x) __typeof(x) 348 #define ecb_decltype(x) __typeof__ (x)
314#endif 349#endif
315 350
351#if _MSC_VER >= 1300
352 #define ecb_deprecated __declspec (deprecated)
353#else
354 #define ecb_deprecated ecb_attribute ((__deprecated__))
355#endif
356
357#if __MSC_VER >= 1500
358 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
359#elif ECB_GCC_VERSION(4,5)
360 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
361#else
362 #define ecb_deprecated_message(msg) ecb_deprecated
363#endif
364
365#if _MSC_VER >= 1400
366 #define ecb_noinline __declspec (noinline)
367#else
316#define ecb_noinline ecb_attribute ((__noinline__)) 368 #define ecb_noinline ecb_attribute ((__noinline__))
369#endif
370
317#define ecb_unused ecb_attribute ((__unused__)) 371#define ecb_unused ecb_attribute ((__unused__))
318#define ecb_const ecb_attribute ((__const__)) 372#define ecb_const ecb_attribute ((__const__))
319#define ecb_pure ecb_attribute ((__pure__)) 373#define ecb_pure ecb_attribute ((__pure__))
320 374
321#if ECB_C11 375#if ECB_C11 || __IBMC_NORETURN
376 /* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */
322 #define ecb_noreturn _Noreturn 377 #define ecb_noreturn _Noreturn
378#elif ECB_CPP11
379 #define ecb_noreturn [[noreturn]]
380#elif _MSC_VER >= 1200
381 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
382 #define ecb_noreturn __declspec (noreturn)
323#else 383#else
324 #define ecb_noreturn ecb_attribute ((__noreturn__)) 384 #define ecb_noreturn ecb_attribute ((__noreturn__))
325#endif 385#endif
326 386
327#if ECB_GCC_VERSION(4,3) 387#if ECB_GCC_VERSION(4,3)
… …
342/* for compatibility to the rest of the world */ 402/* for compatibility to the rest of the world */
343#define ecb_likely(expr) ecb_expect_true (expr) 403#define ecb_likely(expr) ecb_expect_true (expr)
344#define ecb_unlikely(expr) ecb_expect_false (expr) 404#define ecb_unlikely(expr) ecb_expect_false (expr)
345 405
346/* count trailing zero bits and count # of one bits */ 406/* count trailing zero bits and count # of one bits */
347#if ECB_GCC_VERSION(3,4) 407#if ECB_GCC_VERSION(3,4) \
408 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
409 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
410 && ECB_CLANG_BUILTIN(__builtin_popcount))
348 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ 411 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
349 #define ecb_ld32(x) (__builtin_clz (x) ^ 31) 412 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
350 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) 413 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
351 #define ecb_ctz32(x) __builtin_ctz (x) 414 #define ecb_ctz32(x) __builtin_ctz (x)
352 #define ecb_ctz64(x) __builtin_ctzll (x) 415 #define ecb_ctz64(x) __builtin_ctzll (x)
353 #define ecb_popcount32(x) __builtin_popcount (x) 416 #define ecb_popcount32(x) __builtin_popcount (x)
354 /* no popcountll */ 417 /* no popcountll */
355#else 418#else
356 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; 419 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
357 ecb_function_ int 420 ecb_function_ ecb_const int
358 ecb_ctz32 (uint32_t x) 421 ecb_ctz32 (uint32_t x)
359 { 422 {
360 int r = 0; 423 int r = 0;
361 424
362 x &= ~x + 1; /* this isolates the lowest bit */ 425 x &= ~x + 1; /* this isolates the lowest bit */
… …
376#endif 439#endif
377 440
378 return r; 441 return r;
379 } 442 }
380 443
381 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; 444 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
382 ecb_function_ int 445 ecb_function_ ecb_const int
383 ecb_ctz64 (uint64_t x) 446 ecb_ctz64 (uint64_t x)
384 { 447 {
385 int shift = x & 0xffffffffU ? 0 : 32; 448 int shift = x & 0xffffffffU ? 0 : 32;
386 return ecb_ctz32 (x >> shift) + shift; 449 return ecb_ctz32 (x >> shift) + shift;
387 } 450 }
388 451
389 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; 452 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
390 ecb_function_ int 453 ecb_function_ ecb_const int
391 ecb_popcount32 (uint32_t x) 454 ecb_popcount32 (uint32_t x)
392 { 455 {
393 x -= (x >> 1) & 0x55555555; 456 x -= (x >> 1) & 0x55555555;
394 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 457 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
395 x = ((x >> 4) + x) & 0x0f0f0f0f; 458 x = ((x >> 4) + x) & 0x0f0f0f0f;
396 x *= 0x01010101; 459 x *= 0x01010101;
397 460
398 return x >> 24; 461 return x >> 24;
399 } 462 }
400 463
401 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; 464 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
402 ecb_function_ int ecb_ld32 (uint32_t x) 465 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
403 { 466 {
404 int r = 0; 467 int r = 0;
405 468
406 if (x >> 16) { x >>= 16; r += 16; } 469 if (x >> 16) { x >>= 16; r += 16; }
407 if (x >> 8) { x >>= 8; r += 8; } 470 if (x >> 8) { x >>= 8; r += 8; }
… …
410 if (x >> 1) { r += 1; } 473 if (x >> 1) { r += 1; }
411 474
412 return r; 475 return r;
413 } 476 }
414 477
415 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; 478 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
416 ecb_function_ int ecb_ld64 (uint64_t x) 479 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
417 { 480 {
418 int r = 0; 481 int r = 0;
419 482
420 if (x >> 32) { x >>= 32; r += 32; } 483 if (x >> 32) { x >>= 32; r += 32; }
421 484
422 return r + ecb_ld32 (x); 485 return r + ecb_ld32 (x);
423 } 486 }
424#endif 487#endif
425 488
426ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const; 489ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
427ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } 490ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
428ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const; 491ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
429ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } 492ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
430 493
431ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; 494ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
432ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) 495ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
433{ 496{
434 return ( (x * 0x0802U & 0x22110U) 497 return ( (x * 0x0802U & 0x22110U)
435 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; 498 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
436} 499}
437 500
438ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; 501ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
439ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) 502ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
440{ 503{
441 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); 504 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
442 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); 505 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
443 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); 506 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
444 x = ( x >> 8 ) | ( x << 8); 507 x = ( x >> 8 ) | ( x << 8);
445 508
446 return x; 509 return x;
447} 510}
448 511
449ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; 512ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
450ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) 513ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
451{ 514{
452 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); 515 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
453 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); 516 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
454 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); 517 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
455 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); 518 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
… …
458 return x; 521 return x;
459} 522}
460 523
461/* popcount64 is only available on 64 bit cpus as gcc builtin */ 524/* popcount64 is only available on 64 bit cpus as gcc builtin */
462/* so for this version we are lazy */ 525/* so for this version we are lazy */
463ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 526ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
464ecb_function_ int 527ecb_function_ ecb_const int
465ecb_popcount64 (uint64_t x) 528ecb_popcount64 (uint64_t x)
466{ 529{
467 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); 530 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
468} 531}
469 532
470ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; 533ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
471ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; 534ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
472ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; 535ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
473ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; 536ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
474ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; 537ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
475ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 538ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
476ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; 539ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
477ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; 540ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
478 541
479ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } 542ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
480ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } 543ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
481ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } 544ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
482ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } 545ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
483ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } 546ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
484ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } 547ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
485ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } 548ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
486ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } 549ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
487 550
488#if ECB_GCC_VERSION(4,3) 551#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
489 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) 552 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
490 #define ecb_bswap32(x) __builtin_bswap32 (x) 553 #define ecb_bswap32(x) __builtin_bswap32 (x)
491 #define ecb_bswap64(x) __builtin_bswap64 (x) 554 #define ecb_bswap64(x) __builtin_bswap64 (x)
492#else 555#else
493 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; 556 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
494 ecb_function_ uint16_t 557 ecb_function_ ecb_const uint16_t
495 ecb_bswap16 (uint16_t x) 558 ecb_bswap16 (uint16_t x)
496 { 559 {
497 return ecb_rotl16 (x, 8); 560 return ecb_rotl16 (x, 8);
498 } 561 }
499 562
500 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; 563 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
501 ecb_function_ uint32_t 564 ecb_function_ ecb_const uint32_t
502 ecb_bswap32 (uint32_t x) 565 ecb_bswap32 (uint32_t x)
503 { 566 {
504 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); 567 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
505 } 568 }
506 569
507 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; 570 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
508 ecb_function_ uint64_t 571 ecb_function_ ecb_const uint64_t
509 ecb_bswap64 (uint64_t x) 572 ecb_bswap64 (uint64_t x)
510 { 573 {
511 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); 574 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
512 } 575 }
513#endif 576#endif
514 577
515#if ECB_GCC_VERSION(4,5) 578#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
516 #define ecb_unreachable() __builtin_unreachable () 579 #define ecb_unreachable() __builtin_unreachable ()
517#else 580#else
518 /* this seems to work fine, but gcc always emits a warning for it :/ */ 581 /* this seems to work fine, but gcc always emits a warning for it :/ */
519 ecb_inline void ecb_unreachable (void) ecb_noreturn; 582 ecb_inline ecb_noreturn void ecb_unreachable (void);
520 ecb_inline void ecb_unreachable (void) { } 583 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
521#endif 584#endif
522 585
523/* try to tell the compiler that some condition is definitely true */ 586/* try to tell the compiler that some condition is definitely true */
524#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 587#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
525 588
526ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 589ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
527ecb_inline unsigned char 590ecb_inline ecb_const unsigned char
528ecb_byteorder_helper (void) 591ecb_byteorder_helper (void)
529{ 592{
530 /* the union code still generates code under pressure in gcc, */ 593 /* the union code still generates code under pressure in gcc, */
531 /* but less than using pointers, and always seems to */ 594 /* but less than using pointers, and always seems to */
532 /* successfully return a constant. */ 595 /* successfully return a constant. */
533 /* the reason why we have this horrible preprocessor mess */ 596 /* the reason why we have this horrible preprocessor mess */
534 /* is to avoid it in all cases, at least on common architectures */ 597 /* is to avoid it in all cases, at least on common architectures */
535 /* or when using a recent enough gcc version (>= 4.6) */ 598 /* or when using a recent enough gcc version (>= 4.6) */
536#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 599#if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
537 return 0x44; 600 return 0x44;
538#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 601#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
539 return 0x44; 602 return 0x44;
540#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 603#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
541 return 0x11; 604 return 0x11;
… …
547 } u = { 0x11223344 }; 610 } u = { 0x11223344 };
548 return u.c; 611 return u.c;
549#endif 612#endif
550} 613}
551 614
552ecb_inline ecb_bool ecb_big_endian (void) ecb_const; 615ecb_inline ecb_const ecb_bool ecb_big_endian (void);
553ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 616ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
554ecb_inline ecb_bool ecb_little_endian (void) ecb_const; 617ecb_inline ecb_const ecb_bool ecb_little_endian (void);
555ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 618ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
556 619
557#if ECB_GCC_VERSION(3,0) || ECB_C99 620#if ECB_GCC_VERSION(3,0) || ECB_C99
558 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 621 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
559#else 622#else
560 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 623 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
561#endif 624#endif
562 625
563#if __cplusplus 626#if ECB_CPP
564 template<typename T> 627 template<typename T>
565 static inline T ecb_div_rd (T val, T div) 628 static inline T ecb_div_rd (T val, T div)
566 { 629 {
567 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; 630 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
568 } 631 }
… …
592 655
593/* basically, everything uses "ieee pure-endian" floating point numbers */ 656/* basically, everything uses "ieee pure-endian" floating point numbers */
594/* the only noteworthy exception is ancient armle, which uses order 43218765 */ 657/* the only noteworthy exception is ancient armle, which uses order 43218765 */
595#if 0 \ 658#if 0 \
596 || __i386 || __i386__ \ 659 || __i386 || __i386__ \
597 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ 660 || ECB_GCC_AMD64 \
598 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ 661 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
599 || defined __arm__ && defined __ARM_EABI__ \
600 || defined __s390__ || defined __s390x__ \ 662 || defined __s390__ || defined __s390x__ \
601 || defined __mips__ \ 663 || defined __mips__ \
602 || defined __alpha__ \ 664 || defined __alpha__ \
603 || defined __hppa__ \ 665 || defined __hppa__ \
604 || defined __ia64__ \ 666 || defined __ia64__ \
605 || defined __m68k__ \ 667 || defined __m68k__ \
606 || defined __m88k__ \ 668 || defined __m88k__ \
607 || defined __sh__ \ 669 || defined __sh__ \
608 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \ 670 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
609 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) 671 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
672 || defined __aarch64__
610 #define ECB_STDFP 1 673 #define ECB_STDFP 1
611 #include <string.h> /* for memcpy */ 674 #include <string.h> /* for memcpy */
612#else 675#else
613 #define ECB_STDFP 0 676 #define ECB_STDFP 0
614#endif 677#endif
… …
628 #define ECB_NAN NAN 691 #define ECB_NAN NAN
629 #else 692 #else
630 #define ECB_NAN ECB_INFINITY 693 #define ECB_NAN ECB_INFINITY
631 #endif 694 #endif
632 695
696 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
697 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
698 #else
699 #define ecb_ldexpf(x,e) (float) ldexp ((float) (x), (e))
700 #endif
701
633 /* converts an ieee half/binary16 to a float */ 702 /* converts an ieee half/binary16 to a float */
634 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const; 703 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
635 ecb_function_ float 704 ecb_function_ ecb_const float
636 ecb_binary16_to_float (uint16_t x) 705 ecb_binary16_to_float (uint16_t x)
637 { 706 {
638 int e = (x >> 10) & 0x1f; 707 int e = (x >> 10) & 0x1f;
639 int m = x & 0x3ff; 708 int m = x & 0x3ff;
640 float r; 709 float r;
641 710
642 if (!e ) r = ldexpf (m , -24); 711 if (!e ) r = ecb_ldexpf (m , -24);
643 else if (e != 31) r = ldexpf (m + 0x400, e - 25); 712 else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
644 else if (m ) r = ECB_NAN; 713 else if (m ) r = ECB_NAN;
645 else r = ECB_INFINITY; 714 else r = ECB_INFINITY;
646 715
647 return x & 0x8000 ? -r : r; 716 return x & 0x8000 ? -r : r;
648 } 717 }
649 718
650 /* convert a float to ieee single/binary32 */ 719 /* convert a float to ieee single/binary32 */
651 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; 720 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
652 ecb_function_ uint32_t 721 ecb_function_ ecb_const uint32_t
653 ecb_float_to_binary32 (float x) 722 ecb_float_to_binary32 (float x)
654 { 723 {
655 uint32_t r; 724 uint32_t r;
656 725
657 #if ECB_STDFP 726 #if ECB_STDFP
… …
686 755
687 return r; 756 return r;
688 } 757 }
689 758
690 /* converts an ieee single/binary32 to a float */ 759 /* converts an ieee single/binary32 to a float */
691 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; 760 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
692 ecb_function_ float 761 ecb_function_ ecb_const float
693 ecb_binary32_to_float (uint32_t x) 762 ecb_binary32_to_float (uint32_t x)
694 { 763 {
695 float r; 764 float r;
696 765
697 #if ECB_STDFP 766 #if ECB_STDFP
… …
707 x |= 0x800000U; 776 x |= 0x800000U;
708 else 777 else
709 e = 1; 778 e = 1;
710 779
711 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ 780 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
712 r = ldexpf (x * (0.5f / 0x800000U), e - 126); 781 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
713 782
714 r = neg ? -r : r; 783 r = neg ? -r : r;
715 #endif 784 #endif
716 785
717 return r; 786 return r;
718 } 787 }
719 788
720 /* convert a double to ieee double/binary64 */ 789 /* convert a double to ieee double/binary64 */
721 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; 790 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
722 ecb_function_ uint64_t 791 ecb_function_ ecb_const uint64_t
723 ecb_double_to_binary64 (double x) 792 ecb_double_to_binary64 (double x)
724 { 793 {
725 uint64_t r; 794 uint64_t r;
726 795
727 #if ECB_STDFP 796 #if ECB_STDFP
… …
756 825
757 return r; 826 return r;
758 } 827 }
759 828
760 /* converts an ieee double/binary64 to a double */ 829 /* converts an ieee double/binary64 to a double */
761 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const; 830 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
762 ecb_function_ double 831 ecb_function_ ecb_const double
763 ecb_binary64_to_double (uint64_t x) 832 ecb_binary64_to_double (uint64_t x)
764 { 833 {
765 double r; 834 double r;
766 835
767 #if ECB_STDFP 836 #if ECB_STDFP

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