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Comparing libeio/ecb.h (file contents):
Revision 1.4 by root, Mon Jul 18 01:27:03 2011 UTC vs.
Revision 1.12 by root, Mon May 28 17:00:19 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
66/*****************************************************************************/ 84/*****************************************************************************/
67 85
86/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
87/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
88
89#if ECB_NO_THREADS
90# define ECB_NO_SMP 1
91#endif
92
93#if ECB_NO_THREADS || ECB_NO_SMP
94 #define ECB_MEMORY_FENCE do { } while (0)
95#endif
96
68#ifndef ECB_MEMORY_FENCE 97#ifndef ECB_MEMORY_FENCE
69 #if ECB_GCC_VERSION(2,5) 98 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
70 #if __x86 99 #if __i386 || __i386__
71 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; or.b $0, -1(%%esp)" : : : "memory") 100 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
72 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 101 #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 */ 102 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
74 #elif __amd64 103 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
75 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 104 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
76 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 105 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
106 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
107 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
77 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") 108 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
109 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
110 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
111 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
112 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
113 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
114 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
115 #elif __sparc || __sparc__
116 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
117 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
118 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
119 #elif defined __s390__ || defined __s390x__
120 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
121 #elif defined __mips__
122 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
123 #elif defined __alpha__
124 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
78 #endif 125 #endif
79 #endif 126 #endif
80#endif 127#endif
81 128
82#ifndef ECB_MEMORY_FENCE 129#ifndef ECB_MEMORY_FENCE
83 #if ECB_GCC_VERSION(4,4) 130 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
84 #define ECB_MEMORY_FENCE __sync_synchronize () 131 #define ECB_MEMORY_FENCE __sync_synchronize ()
85 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) 132 /*#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 ); }) 133 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
87 #elif _MSC_VER >= 1400 134 #elif _MSC_VER >= 1400 /* VC++ 2005 */
88 #define ECB_MEMORY_FENCE do { } while (0) 135 #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 () 136 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
93 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 137 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
94 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 138 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
139 #elif defined _WIN32
140 #include <WinNT.h>
141 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
142 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
143 #include <mbarrier.h>
144 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
145 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
146 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
147 #elif __xlC__
148 #define ECB_MEMORY_FENCE __sync ()
95 #endif 149 #endif
96#endif 150#endif
97 151
98#ifndef ECB_MEMORY_FENCE 152#ifndef ECB_MEMORY_FENCE
153 #if !ECB_AVOID_PTHREADS
154 /*
155 * if you get undefined symbol references to pthread_mutex_lock,
156 * or failure to find pthread.h, then you should implement
157 * the ECB_MEMORY_FENCE operations for your cpu/compiler
158 * OR provide pthread.h and link against the posix thread library
159 * of your system.
160 */
99 #include <pthread.h> 161 #include <pthread.h>
162 #define ECB_NEEDS_PTHREADS 1
163 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
100 164
101 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 165 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) 166 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
167 #endif
168#endif
169
170#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
103 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 171 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
172#endif
173
174#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
104 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 175 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
105#endif 176#endif
106 177
107/*****************************************************************************/ 178/*****************************************************************************/
108 179
… …
232 x *= 0x01010101; 303 x *= 0x01010101;
233 304
234 return x >> 24; 305 return x >> 24;
235 } 306 }
236 307
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; 308 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
241 ecb_function_ int ecb_ld32 (uint32_t x) 309 ecb_function_ int ecb_ld32 (uint32_t x)
242 { 310 {
243 int r = 0; 311 int r = 0;
244 312
… …
259 if (x >> 32) { x >>= 32; r += 32; } 327 if (x >> 32) { x >>= 32; r += 32; }
260 328
261 return r + ecb_ld32 (x); 329 return r + ecb_ld32 (x);
262 } 330 }
263#endif 331#endif
332
333ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
334ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
335ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
336ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
337
338ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
339ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
340{
341 return ( (x * 0x0802U & 0x22110U)
342 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
343}
344
345ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
346ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
347{
348 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
349 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
350 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
351 x = ( x >> 8 ) | ( x << 8);
352
353 return x;
354}
355
356ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
357ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
358{
359 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
360 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
361 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
362 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
363 x = ( x >> 16 ) | ( x << 16);
364
365 return x;
366}
264 367
265/* popcount64 is only available on 64 bit cpus as gcc builtin */ 368/* popcount64 is only available on 64 bit cpus as gcc builtin */
266/* so for this version we are lazy */ 369/* so for this version we are lazy */
267ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 370ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
268ecb_function_ int 371ecb_function_ int
… …
318 421
319#if ECB_GCC_VERSION(4,5) 422#if ECB_GCC_VERSION(4,5)
320 #define ecb_unreachable() __builtin_unreachable () 423 #define ecb_unreachable() __builtin_unreachable ()
321#else 424#else
322 /* this seems to work fine, but gcc always emits a warning for it :/ */ 425 /* this seems to work fine, but gcc always emits a warning for it :/ */
323 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 426 ecb_inline void ecb_unreachable (void) ecb_noreturn;
324 ecb_function_ void ecb_unreachable (void) { } 427 ecb_inline void ecb_unreachable (void) { }
325#endif 428#endif
326 429
327/* try to tell the compiler that some condition is definitely true */ 430/* try to tell the compiler that some condition is definitely true */
328#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 431#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
329 432
330ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 433ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
331ecb_function_ unsigned char 434ecb_inline unsigned char
332ecb_byteorder_helper (void) 435ecb_byteorder_helper (void)
333{ 436{
334 const uint32_t u = 0x11223344; 437 const uint32_t u = 0x11223344;
335 return *(unsigned char *)&u; 438 return *(unsigned char *)&u;
336} 439}
337 440
338ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 441ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
339ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 442ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
340ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 443ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
341ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 444ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
342 445
343#if ECB_GCC_VERSION(3,0) || ECB_C99 446#if ECB_GCC_VERSION(3,0) || ECB_C99
344 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 447 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
345#else 448#else
346 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 449 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
450#endif
451
452#if __cplusplus
453 template<typename T>
454 static inline T ecb_div_rd (T val, T div)
455 {
456 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
457 }
458 template<typename T>
459 static inline T ecb_div_ru (T val, T div)
460 {
461 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
462 }
463#else
464 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
465 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
347#endif 466#endif
348 467
349#if ecb_cplusplus_does_not_suck 468#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) */ 469 /* 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> 470 template<typename T, int N>

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