ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libecb/ecb.h
(Generate patch)

Comparing libecb/ecb.h (file contents):
Revision 1.61 by root, Thu Aug 4 14:27:40 2011 UTC vs.
Revision 1.78 by root, Sat Feb 4 15:17:22 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:
… …
67 67
68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 69/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70 70
71#if ECB_NO_THREADS || ECB_NO_SMP 71#if ECB_NO_THREADS || ECB_NO_SMP
72 #define ECB_MEMORY_FENCE do { } while (0) 72 #define ECB_MEMORY_FENCE do { } while (0)
73 #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0)
74 #define ECB_MEMORY_FENCE_RELEASE do { } while (0)
75#endif 73#endif
76 74
77#ifndef ECB_MEMORY_FENCE 75#ifndef ECB_MEMORY_FENCE
78 #if ECB_GCC_VERSION(2,5) 76 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
79 #if __x86 77 #if __i386 || __i386__
80 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 78 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
81 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 79 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
82 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 80 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
83 #elif __amd64 81 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
85 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 83 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
86 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 84 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
85 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
88 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
89 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
91 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
92 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
93 #elif __sparc || __sparc__
94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
95 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
96 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
97 #elif defined(__s390__) || defined(__s390x__)
98 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
87 #endif 99 #endif
88 #endif 100 #endif
89#endif 101#endif
90 102
91#ifndef ECB_MEMORY_FENCE 103#ifndef ECB_MEMORY_FENCE
92 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) 104 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
93 #define ECB_MEMORY_FENCE __sync_synchronize () 105 #define ECB_MEMORY_FENCE __sync_synchronize ()
94 #define ECB_MEMORY_FENCE_ACQUIRE __sync_synchronize () /* ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ 106 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
95 #define ECB_MEMORY_FENCE_RELEASE __sync_synchronize () /* ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ 107 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
96 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 108 #elif _MSC_VER >= 1400 /* VC++ 2005 */
97 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 109 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
98 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 110 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
99 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 111 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
100 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 112 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
101 #elif defined(_WIN32) 113 #elif defined(_WIN32)
102 #include <WinNT.h> 114 #include <WinNT.h>
103 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ 115 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
104 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 116 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
105 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 117 #include <mbarrier.h>
118 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
119 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
120 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
106 #endif 121 #endif
107#endif 122#endif
108 123
109#ifndef ECB_MEMORY_FENCE 124#ifndef ECB_MEMORY_FENCE
125 #if !ECB_AVOID_PTHREADS
110 /* 126 /*
111 * if you get undefined symbol references to pthread_mutex_lock, 127 * if you get undefined symbol references to pthread_mutex_lock,
112 * or failure to find pthread.h, then you should implement 128 * or failure to find pthread.h, then you should implement
113 * the ECB_MEMORY_FENCE operations for your cpu/compiler 129 * the ECB_MEMORY_FENCE operations for your cpu/compiler
114 * OR provide pthread.h and link against the posix thread library 130 * OR provide pthread.h and link against the posix thread library
115 * of your system. 131 * of your system.
116 */ 132 */
117 #include <pthread.h> 133 #include <pthread.h>
118 #define ECB_NEEDS_PTHREADS 1 134 #define ECB_NEEDS_PTHREADS 1
119 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 135 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
120 136
121 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 137 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
122 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) 138 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
139 #endif
140#endif
141
142#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
123 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 143 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
144#endif
145
146#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
124 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 147 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
125#endif 148#endif
126 149
127/*****************************************************************************/ 150/*****************************************************************************/
128 151
… …
277 300
278 return r + ecb_ld32 (x); 301 return r + ecb_ld32 (x);
279 } 302 }
280#endif 303#endif
281 304
305ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
306ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
307{
308 return ( (x * 0x0802U & 0x22110U)
309 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
310}
311
312ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
313ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
314{
315 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
316 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
317 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
318 x = ( x >> 8 ) | ( x << 8);
319
320 return x;
321}
322
323ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
324ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
325{
326 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
327 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
328 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
329 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
330 x = ( x >> 16 ) | ( x << 16);
331
332 return x;
333}
334
282/* popcount64 is only available on 64 bit cpus as gcc builtin */ 335/* popcount64 is only available on 64 bit cpus as gcc builtin */
283/* so for this version we are lazy */ 336/* so for this version we are lazy */
284ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 337ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
285ecb_function_ int 338ecb_function_ int
286ecb_popcount64 (uint64_t x) 339ecb_popcount64 (uint64_t x)
… …
335 388
336#if ECB_GCC_VERSION(4,5) 389#if ECB_GCC_VERSION(4,5)
337 #define ecb_unreachable() __builtin_unreachable () 390 #define ecb_unreachable() __builtin_unreachable ()
338#else 391#else
339 /* this seems to work fine, but gcc always emits a warning for it :/ */ 392 /* this seems to work fine, but gcc always emits a warning for it :/ */
340 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 393 ecb_inline void ecb_unreachable (void) ecb_noreturn;
341 ecb_function_ void ecb_unreachable (void) { } 394 ecb_inline void ecb_unreachable (void) { }
342#endif 395#endif
343 396
344/* try to tell the compiler that some condition is definitely true */ 397/* try to tell the compiler that some condition is definitely true */
345#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 398#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
346 399
347ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 400ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
348ecb_function_ unsigned char 401ecb_inline unsigned char
349ecb_byteorder_helper (void) 402ecb_byteorder_helper (void)
350{ 403{
351 const uint32_t u = 0x11223344; 404 const uint32_t u = 0x11223344;
352 return *(unsigned char *)&u; 405 return *(unsigned char *)&u;
353} 406}
354 407
355ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 408ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
356ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 409ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
357ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 410ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
358ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 411ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
359 412
360#if ECB_GCC_VERSION(3,0) || ECB_C99 413#if ECB_GCC_VERSION(3,0) || ECB_C99
361 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 414 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
362#else 415#else
363 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 416 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
417#endif
418
419#if __cplusplus
420 template<typename T>
421 static inline T ecb_div_rd (T val, T div)
422 {
423 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
424 }
425 template<typename T>
426 static inline T ecb_div_ru (T val, T div)
427 {
428 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
429 }
430#else
431 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
432 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
364#endif 433#endif
365 434
366#if ecb_cplusplus_does_not_suck 435#if ecb_cplusplus_does_not_suck
367 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ 436 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
368 template<typename T, int N> 437 template<typename T, int N>

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines