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

Comparing libecb/ecb.h (file contents):
Revision 1.56 by sf-exg, Thu Jul 28 13:45:44 2011 UTC vs.
Revision 1.84 by root, Thu Mar 29 22:29:57 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:
… …
48 #include <inttypes.h> 48 #include <inttypes.h>
49#endif 49#endif
50 50
51/* many compilers define _GNUC_ to some versions but then only implement 51/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions, 52 * what their idiot authors think are the "more important" extensions,
53 * causing enourmous grief in return for some better fake benchmark numbers. 53 * causing enormous grief in return for some better fake benchmark numbers.
54 * or so. 54 * or so.
55 * we try to detect these and simply assume they are not gcc - if they have 55 * 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. 56 * an issue with that they should have done it right in the first place.
57 */ 57 */
58#ifndef ECB_GCC_VERSION 58#ifndef ECB_GCC_VERSION
… …
63 #endif 63 #endif
64#endif 64#endif
65 65
66/*****************************************************************************/ 66/*****************************************************************************/
67 67
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 */
70
71#if ECB_NO_THREADS
72# define ECB_NO_SMP 1
73#endif
74
75#if ECB_NO_THREADS || ECB_NO_SMP
76 #define ECB_MEMORY_FENCE do { } while (0)
77#endif
78
68#ifndef ECB_MEMORY_FENCE 79#ifndef ECB_MEMORY_FENCE
69 #if ECB_GCC_VERSION(2,5) 80 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
70 #if __x86 81 #if __i386 || __i386__
71 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
72 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 83 #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 */ 84 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
74 #elif __amd64 85 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
75 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
76 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 87 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
88 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
89 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
77 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") 90 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
91 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
92 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
93 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
94 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
95 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
96 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
97 #elif __sparc || __sparc__
98 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
99 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
100 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
101 #elif defined(__s390__) || defined(__s390x__)
102 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
103 #elif defined(__mips__)
104 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
78 #endif 105 #endif
79 #endif 106 #endif
80#endif 107#endif
81 108
82#ifndef ECB_MEMORY_FENCE 109#ifndef ECB_MEMORY_FENCE
83 #if ECB_GCC_VERSION(4,4) 110 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
84 #define ECB_MEMORY_FENCE __sync_synchronize () 111 #define ECB_MEMORY_FENCE __sync_synchronize ()
85 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) 112 /*#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 ); }) 113 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
87 #elif _MSC_VER >= 1400 && 0 /* TODO: only true when using volatiles */ 114 #elif _MSC_VER >= 1400 /* VC++ 2005 */
115 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
88 #define ECB_MEMORY_FENCE do { } while (0) 116 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
89 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 117 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
90 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 118 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
91 #elif defined(_WIN32) 119 #elif defined(_WIN32)
92 #include <WinNT.h> 120 #include <WinNT.h>
121 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
122 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
123 #include <mbarrier.h>
93 #define ECB_MEMORY_FENCE MemoryBarrier () 124 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
94 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 125 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
95 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 126 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
127 #elif __xlC__
128 #define ECB_MEMORY_FENCE __sync ()
96 #endif 129 #endif
97#endif 130#endif
98 131
99#ifndef ECB_MEMORY_FENCE 132#ifndef ECB_MEMORY_FENCE
133 #if !ECB_AVOID_PTHREADS
134 /*
135 * if you get undefined symbol references to pthread_mutex_lock,
136 * or failure to find pthread.h, then you should implement
137 * the ECB_MEMORY_FENCE operations for your cpu/compiler
138 * OR provide pthread.h and link against the posix thread library
139 * of your system.
140 */
100 #include <pthread.h> 141 #include <pthread.h>
142 #define ECB_NEEDS_PTHREADS 1
143 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
101 144
102 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 145 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
103 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) 146 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
147 #endif
148#endif
149
150#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
104 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 151 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
152#endif
153
154#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
105 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 155 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
106#endif 156#endif
107 157
108/*****************************************************************************/ 158/*****************************************************************************/
109 159
… …
258 308
259 return r + ecb_ld32 (x); 309 return r + ecb_ld32 (x);
260 } 310 }
261#endif 311#endif
262 312
313ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
314ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
315{
316 return ( (x * 0x0802U & 0x22110U)
317 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
318}
319
320ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
321ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
322{
323 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
324 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
325 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
326 x = ( x >> 8 ) | ( x << 8);
327
328 return x;
329}
330
331ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
332ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
333{
334 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
335 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
336 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
337 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
338 x = ( x >> 16 ) | ( x << 16);
339
340 return x;
341}
342
263/* popcount64 is only available on 64 bit cpus as gcc builtin */ 343/* popcount64 is only available on 64 bit cpus as gcc builtin */
264/* so for this version we are lazy */ 344/* so for this version we are lazy */
265ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 345ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
266ecb_function_ int 346ecb_function_ int
267ecb_popcount64 (uint64_t x) 347ecb_popcount64 (uint64_t x)
… …
316 396
317#if ECB_GCC_VERSION(4,5) 397#if ECB_GCC_VERSION(4,5)
318 #define ecb_unreachable() __builtin_unreachable () 398 #define ecb_unreachable() __builtin_unreachable ()
319#else 399#else
320 /* this seems to work fine, but gcc always emits a warning for it :/ */ 400 /* this seems to work fine, but gcc always emits a warning for it :/ */
321 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 401 ecb_inline void ecb_unreachable (void) ecb_noreturn;
322 ecb_function_ void ecb_unreachable (void) { } 402 ecb_inline void ecb_unreachable (void) { }
323#endif 403#endif
324 404
325/* try to tell the compiler that some condition is definitely true */ 405/* try to tell the compiler that some condition is definitely true */
326#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 406#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
327 407
328ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 408ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
329ecb_function_ unsigned char 409ecb_inline unsigned char
330ecb_byteorder_helper (void) 410ecb_byteorder_helper (void)
331{ 411{
332 const uint32_t u = 0x11223344; 412 const uint32_t u = 0x11223344;
333 return *(unsigned char *)&u; 413 return *(unsigned char *)&u;
334} 414}
335 415
336ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 416ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
337ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 417ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
338ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 418ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
339ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 419ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
340 420
341#if ECB_GCC_VERSION(3,0) || ECB_C99 421#if ECB_GCC_VERSION(3,0) || ECB_C99
342 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 422 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
343#else 423#else
344 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 424 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
425#endif
426
427#if __cplusplus
428 template<typename T>
429 static inline T ecb_div_rd (T val, T div)
430 {
431 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
432 }
433 template<typename T>
434 static inline T ecb_div_ru (T val, T div)
435 {
436 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
437 }
438#else
439 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
440 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
345#endif 441#endif
346 442
347#if ecb_cplusplus_does_not_suck 443#if ecb_cplusplus_does_not_suck
348 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ 444 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
349 template<typename T, int N> 445 template<typename T, int N>

Diff Legend

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