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Comparing libecb/ecb.h (file contents):
Revision 1.54 by root, Wed Jul 20 00:38:30 2011 UTC vs.
Revision 1.90 by root, Tue May 29 14:09:49 2012 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de> 4 * Copyright (©) 2009-2012 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:
… …
28 */ 28 */
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010001
35
33#ifdef _WIN32 36#ifdef _WIN32
34 typedef signed char int8_t; 37 typedef signed char int8_t;
35 typedef unsigned char uint8_t; 38 typedef unsigned char uint8_t;
36 typedef signed short int16_t; 39 typedef signed short int16_t;
37 typedef unsigned short uint16_t; 40 typedef unsigned short uint16_t;
… …
42 typedef unsigned long long uint64_t; 45 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */ 46 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t; 47 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t; 48 typedef unsigned __int64 uint64_t;
46 #endif 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 typedef intptr_t ptrdiff_t;
47#else 60#else
48 #include <inttypes.h> 61 #include <inttypes.h>
62 #if UINTMAX_MAX > 0xffffffffU
63 #define ECB_PTRSIZE 8
64 #else
65 #define ECB_PTRSIZE 4
66 #endif
49#endif 67#endif
50 68
51/* many compilers define _GNUC_ to some versions but then only implement 69/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions, 70 * what their idiot authors think are the "more important" extensions,
53 * causing enourmous grief in return for some better fake benchmark numbers. 71 * causing enormous grief in return for some better fake benchmark numbers.
54 * or so. 72 * or so.
55 * we try to detect these and simply assume they are not gcc - if they have 73 * we try to detect these and simply assume they are not gcc - if they have
56 * an issue with that they should have done it right in the first place. 74 * an issue with that they should have done it right in the first place.
57 */ 75 */
58#ifndef ECB_GCC_VERSION 76#ifndef ECB_GCC_VERSION
59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) 77 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
60 #define ECB_GCC_VERSION(major,minor) 0 78 #define ECB_GCC_VERSION(major,minor) 0
61 #else 79 #else
62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 80 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif 81 #endif
64#endif 82#endif
65 83
84#define ECB_C99 (__STDC_VERSION__ >= 199901L)
85#define ECB_C11 (__STDC_VERSION__ >= 201112L)
86
66/*****************************************************************************/ 87/*****************************************************************************/
67 88
89/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
90/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
91
92#if ECB_NO_THREADS
93# define ECB_NO_SMP 1
94#endif
95
96#if ECB_NO_THREADS || ECB_NO_SMP
97 #define ECB_MEMORY_FENCE do { } while (0)
98#endif
99
68#ifndef ECB_MEMORY_FENCE 100#ifndef ECB_MEMORY_FENCE
69 #if ECB_GCC_VERSION(2,5) 101 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
70 #if __x86 102 /* we assume that these memory fences work on all variables/all memory accesses, */
103 /* not just C11 atomics and atomic accesses */
104 #include <stdatomic.h>
105 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
106 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
107 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
108 #endif
109#endif
110
111#ifndef ECB_MEMORY_FENCE
112 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
113 #if __i386 || __i386__
71 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 114 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
72 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 115 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
73 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE /* better be safe than sorry */ 116 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
74 #elif __amd64 117 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
75 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 118 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
76 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 119 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
120 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
121 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
77 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") 122 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
123 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
124 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
125 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
126 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
127 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
128 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
129 #elif __sparc || __sparc__
130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
131 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
132 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
133 #elif defined __s390__ || defined __s390x__
134 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
135 #elif defined __mips__
136 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
137 #elif defined __alpha__
138 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
78 #endif 139 #endif
79 #endif 140 #endif
80#endif 141#endif
81 142
82#ifndef ECB_MEMORY_FENCE 143#ifndef ECB_MEMORY_FENCE
83 #if ECB_GCC_VERSION(4,4) 144 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
84 #define ECB_MEMORY_FENCE __sync_synchronize () 145 #define ECB_MEMORY_FENCE __sync_synchronize ()
85 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) 146 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
86 #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) 147 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
87 #elif _MSC_VER >= 1400 148 #elif _MSC_VER >= 1400 /* VC++ 2005 */
88 #define ECB_MEMORY_FENCE do { } while (0) 149 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
89 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
90 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
91 #elif defined(_WIN32) && defined(MemoryBarrier)
92 #define ECB_MEMORY_FENCE MemoryBarrier () 150 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
93 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 151 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
94 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 152 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
153 #elif defined _WIN32
154 #include <WinNT.h>
155 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
156 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
157 #include <mbarrier.h>
158 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
159 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
160 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
161 #elif __xlC__
162 #define ECB_MEMORY_FENCE __sync ()
95 #endif 163 #endif
96#endif 164#endif
97 165
98#ifndef ECB_MEMORY_FENCE 166#ifndef ECB_MEMORY_FENCE
167 #if !ECB_AVOID_PTHREADS
168 /*
169 * if you get undefined symbol references to pthread_mutex_lock,
170 * or failure to find pthread.h, then you should implement
171 * the ECB_MEMORY_FENCE operations for your cpu/compiler
172 * OR provide pthread.h and link against the posix thread library
173 * of your system.
174 */
99 #include <pthread.h> 175 #include <pthread.h>
176 #define ECB_NEEDS_PTHREADS 1
177 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
100 178
101 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 179 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
102 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) 180 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
181 #endif
182#endif
183
184#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
103 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 185 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
186#endif
187
188#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
104 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 189 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
105#endif 190#endif
106 191
107/*****************************************************************************/ 192/*****************************************************************************/
108
109#define ECB_C99 (__STDC_VERSION__ >= 199901L)
110 193
111#if __cplusplus 194#if __cplusplus
112 #define ecb_inline static inline 195 #define ecb_inline static inline
113#elif ECB_GCC_VERSION(2,5) 196#elif ECB_GCC_VERSION(2,5)
114 #define ecb_inline static __inline__ 197 #define ecb_inline static __inline__
… …
153#elif ECB_GCC_VERSION(3,0) 236#elif ECB_GCC_VERSION(3,0)
154 #define ecb_decltype(x) __typeof(x) 237 #define ecb_decltype(x) __typeof(x)
155#endif 238#endif
156 239
157#define ecb_noinline ecb_attribute ((__noinline__)) 240#define ecb_noinline ecb_attribute ((__noinline__))
158#define ecb_noreturn ecb_attribute ((__noreturn__))
159#define ecb_unused ecb_attribute ((__unused__)) 241#define ecb_unused ecb_attribute ((__unused__))
160#define ecb_const ecb_attribute ((__const__)) 242#define ecb_const ecb_attribute ((__const__))
161#define ecb_pure ecb_attribute ((__pure__)) 243#define ecb_pure ecb_attribute ((__pure__))
244
245#if ECB_C11
246 #define ecb_noreturn _Noreturn
247#else
248 #define ecb_noreturn ecb_attribute ((__noreturn__))
249#endif
162 250
163#if ECB_GCC_VERSION(4,3) 251#if ECB_GCC_VERSION(4,3)
164 #define ecb_artificial ecb_attribute ((__artificial__)) 252 #define ecb_artificial ecb_attribute ((__artificial__))
165 #define ecb_hot ecb_attribute ((__hot__)) 253 #define ecb_hot ecb_attribute ((__hot__))
166 #define ecb_cold ecb_attribute ((__cold__)) 254 #define ecb_cold ecb_attribute ((__cold__))
… …
232 x *= 0x01010101; 320 x *= 0x01010101;
233 321
234 return x >> 24; 322 return x >> 24;
235 } 323 }
236 324
237 /* you have the choice beetween something with a table lookup, */
238 /* something using lots of bit arithmetic and a simple loop */
239 /* we went for the loop */
240 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; 325 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
241 ecb_function_ int ecb_ld32 (uint32_t x) 326 ecb_function_ int ecb_ld32 (uint32_t x)
242 { 327 {
243 int r = 0; 328 int r = 0;
244 329
… …
259 if (x >> 32) { x >>= 32; r += 32; } 344 if (x >> 32) { x >>= 32; r += 32; }
260 345
261 return r + ecb_ld32 (x); 346 return r + ecb_ld32 (x);
262 } 347 }
263#endif 348#endif
349
350ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
351ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
352ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
353ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
354
355ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
356ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
357{
358 return ( (x * 0x0802U & 0x22110U)
359 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
360}
361
362ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
363ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
364{
365 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
366 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
367 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
368 x = ( x >> 8 ) | ( x << 8);
369
370 return x;
371}
372
373ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
374ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
375{
376 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
377 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
378 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
379 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
380 x = ( x >> 16 ) | ( x << 16);
381
382 return x;
383}
264 384
265/* popcount64 is only available on 64 bit cpus as gcc builtin */ 385/* popcount64 is only available on 64 bit cpus as gcc builtin */
266/* so for this version we are lazy */ 386/* so for this version we are lazy */
267ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 387ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
268ecb_function_ int 388ecb_function_ int
… …
318 438
319#if ECB_GCC_VERSION(4,5) 439#if ECB_GCC_VERSION(4,5)
320 #define ecb_unreachable() __builtin_unreachable () 440 #define ecb_unreachable() __builtin_unreachable ()
321#else 441#else
322 /* this seems to work fine, but gcc always emits a warning for it :/ */ 442 /* this seems to work fine, but gcc always emits a warning for it :/ */
323 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 443 ecb_inline void ecb_unreachable (void) ecb_noreturn;
324 ecb_function_ void ecb_unreachable (void) { } 444 ecb_inline void ecb_unreachable (void) { }
325#endif 445#endif
326 446
327/* try to tell the compiler that some condition is definitely true */ 447/* try to tell the compiler that some condition is definitely true */
328#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 448#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
329 449
330ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 450ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
331ecb_function_ unsigned char 451ecb_inline unsigned char
332ecb_byteorder_helper (void) 452ecb_byteorder_helper (void)
333{ 453{
334 const uint32_t u = 0x11223344; 454 const uint32_t u = 0x11223344;
335 return *(unsigned char *)&u; 455 return *(unsigned char *)&u;
336} 456}
337 457
338ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 458ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
339ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 459ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
340ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 460ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
341ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 461ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
342 462
343#if ECB_GCC_VERSION(3,0) || ECB_C99 463#if ECB_GCC_VERSION(3,0) || ECB_C99
344 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 464 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
345#else 465#else
346 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 466 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
467#endif
468
469#if __cplusplus
470 template<typename T>
471 static inline T ecb_div_rd (T val, T div)
472 {
473 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
474 }
475 template<typename T>
476 static inline T ecb_div_ru (T val, T div)
477 {
478 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
479 }
480#else
481 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
482 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
347#endif 483#endif
348 484
349#if ecb_cplusplus_does_not_suck 485#if ecb_cplusplus_does_not_suck
350 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ 486 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
351 template<typename T, int N> 487 template<typename T, int N>

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