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

Comparing libeio/ecb.h (file contents):
Revision 1.2 by root, Fri Jun 17 18:55:42 2011 UTC vs.
Revision 1.9 by root, Thu Sep 15 13:20:54 2011 UTC

… …
38 typedef signed int int32_t; 38 typedef signed int int32_t;
39 typedef unsigned int uint32_t; 39 typedef unsigned int uint32_t;
40 #if __GNUC__ 40 #if __GNUC__
41 typedef signed long long int64_t; 41 typedef signed long long int64_t;
42 typedef unsigned long long uint64_t; 42 typedef unsigned long long uint64_t;
43 #else 43 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t; 44 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t; 45 typedef unsigned __int64 uint64_t;
46 #endif 46 #endif
47#else 47#else
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
… …
61 #else 61 #else
62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif 63 #endif
64#endif 64#endif
65 65
66/*****************************************************************************/
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 || ECB_NO_SMP
72 #define ECB_MEMORY_FENCE do { } while (0)
73#endif
74
75#ifndef ECB_MEMORY_FENCE
76 #if ECB_GCC_VERSION(2,5)
77 #if __i386__
78 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
80 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
81 #elif __amd64
82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
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 #endif
94 #endif
95#endif
96
97#ifndef ECB_MEMORY_FENCE
98 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER)
99 #define ECB_MEMORY_FENCE __sync_synchronize ()
100 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
101 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
102 #elif _MSC_VER >= 1400 /* VC++ 2005 */
103 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
104 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
105 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
106 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
107 #elif defined(_WIN32)
108 #include <WinNT.h>
109 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
110 #endif
111#endif
112
113#ifndef ECB_MEMORY_FENCE
114 #if !ECB_AVOID_PTHREADS
115 /*
116 * if you get undefined symbol references to pthread_mutex_lock,
117 * or failure to find pthread.h, then you should implement
118 * the ECB_MEMORY_FENCE operations for your cpu/compiler
119 * OR provide pthread.h and link against the posix thread library
120 * of your system.
121 */
122 #include <pthread.h>
123 #define ECB_NEEDS_PTHREADS 1
124 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
125
126 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
127 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
128 #endif
129#endif
130
131#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
132 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
133#endif
134
135#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
136 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
137#endif
138
139/*****************************************************************************/
140
66#define ECB_C99 (__STDC_VERSION__ >= 199901L) 141#define ECB_C99 (__STDC_VERSION__ >= 199901L)
67 142
68#if __cplusplus 143#if __cplusplus
69 #define ecb_inline static inline 144 #define ecb_inline static inline
70#elif ECB_GCC_VERSION(2,5) 145#elif ECB_GCC_VERSION(2,5)
… …
152 { 227 {
153 int r = 0; 228 int r = 0;
154 229
155 x &= ~x + 1; /* this isolates the lowest bit */ 230 x &= ~x + 1; /* this isolates the lowest bit */
156 231
232#if ECB_branchless_on_i386
233 r += !!(x & 0xaaaaaaaa) << 0;
234 r += !!(x & 0xcccccccc) << 1;
235 r += !!(x & 0xf0f0f0f0) << 2;
236 r += !!(x & 0xff00ff00) << 3;
237 r += !!(x & 0xffff0000) << 4;
238#else
157 if (x & 0xaaaaaaaa) r += 1; 239 if (x & 0xaaaaaaaa) r += 1;
158 if (x & 0xcccccccc) r += 2; 240 if (x & 0xcccccccc) r += 2;
159 if (x & 0xf0f0f0f0) r += 4; 241 if (x & 0xf0f0f0f0) r += 4;
160 if (x & 0xff00ff00) r += 8; 242 if (x & 0xff00ff00) r += 8;
161 if (x & 0xffff0000) r += 16; 243 if (x & 0xffff0000) r += 16;
244#endif
162 245
163 return r; 246 return r;
164 } 247 }
165 248
166 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; 249 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
167 ecb_function_ int 250 ecb_function_ int
168 ecb_ctz64 (uint64_t x) 251 ecb_ctz64 (uint64_t x)
169 { 252 {
170 int shift = x & 0xffffffffU ? 0 : 32; 253 int shift = x & 0xffffffffU ? 0 : 32;
171 return ecb_ctz (x >> shift) + shift; 254 return ecb_ctz32 (x >> shift) + shift;
172 } 255 }
173 256
174 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; 257 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
175 ecb_function_ int 258 ecb_function_ int
176 ecb_popcount32 (uint32_t x) 259 ecb_popcount32 (uint32_t x)
… …
181 x *= 0x01010101; 264 x *= 0x01010101;
182 265
183 return x >> 24; 266 return x >> 24;
184 } 267 }
185 268
186 /* you have the choice beetween something with a table lookup, */
187 /* something using lots of bit arithmetic and a simple loop */
188 /* we went for the loop */
189 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; 269 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
190 ecb_function_ int ecb_ld32 (uint32_t x) 270 ecb_function_ int ecb_ld32 (uint32_t x)
191 { 271 {
192 int r = -1; 272 int r = 0;
193 273
194 do 274 if (x >> 16) { x >>= 16; r += 16; }
195 { 275 if (x >> 8) { x >>= 8; r += 8; }
196 x >>= 1; 276 if (x >> 4) { x >>= 4; r += 4; }
197 ++r; 277 if (x >> 2) { x >>= 2; r += 2; }
198 } 278 if (x >> 1) { r += 1; }
199 while (x);
200 279
201 return r; 280 return r;
202 } 281 }
203 282
204 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; 283 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
205 ecb_function_ int ecb_ld64 (uint64_t x) 284 ecb_function_ int ecb_ld64 (uint64_t x)
206 { 285 {
207 int r = -1; 286 int r = 0;
208 287
209 do 288 if (x >> 32) { x >>= 32; r += 32; }
210 {
211 x >>= 1;
212 ++r;
213 }
214 while (x);
215 289
216 return r; 290 return r + ecb_ld32 (x);
217 } 291 }
218#endif 292#endif
219 293
220/* popcount64 is only available on 64 bit cpus as gcc builtin */ 294/* popcount64 is only available on 64 bit cpus as gcc builtin */
221/* so for this version we are lazy */ 295/* so for this version we are lazy */
… …
224ecb_popcount64 (uint64_t x) 298ecb_popcount64 (uint64_t x)
225{ 299{
226 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); 300 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
227} 301}
228 302
303ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
304ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
305ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
306ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
307ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
308ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
309ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
310ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
311
312ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
313ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
314ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
315ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
316ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
317ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
318ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
319ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
320
229#if ECB_GCC_VERSION(4,3) 321#if ECB_GCC_VERSION(4,3)
230 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) 322 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
231 #define ecb_bswap32(x) __builtin_bswap32 (x) 323 #define ecb_bswap32(x) __builtin_bswap32 (x)
232 #define ecb_bswap64(x) __builtin_bswap64 (x) 324 #define ecb_bswap64(x) __builtin_bswap64 (x)
233#else 325#else
234 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; 326 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
235 ecb_function_ uint32_t 327 ecb_function_ uint16_t
236 ecb_bswap16 (uint32_t x) 328 ecb_bswap16 (uint16_t x)
237 { 329 {
238 return ((x >> 8) & 0xff) 330 return ecb_rotl16 (x, 8);
239 | ((x << 8) & 0x00ff0000)
240 | (x << 24);
241 } 331 }
242 332
243 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; 333 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
244 ecb_function_ uint32_t 334 ecb_function_ uint32_t
245 ecb_bswap32 (uint32_t x) 335 ecb_bswap32 (uint32_t x)
246 { 336 {
247 return (x >> 24) 337 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
248 | ((x >> 8) & 0x0000ff00)
249 | ((x << 8) & 0x00ff0000)
250 | (x << 24);
251 } 338 }
252 339
253 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; 340 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
254 ecb_function_ uint64_t 341 ecb_function_ uint64_t
255 ecb_bswap64 (uint64_t x) 342 ecb_bswap64 (uint64_t x)
256 { 343 {
257 return (((uint64_t)ecb_bswap32 (x)) << 32) 344 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
258 | ecb_bswap32 (x >> 32);
259 } 345 }
260#endif 346#endif
261 347
262#if ECB_GCC_VERSION(4,5) 348#if ECB_GCC_VERSION(4,5)
263 #define ecb_unreachable() __builtin_unreachable () 349 #define ecb_unreachable() __builtin_unreachable ()
… …
298 } 384 }
299#else 385#else
300 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 386 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
301#endif 387#endif
302 388
303ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
304ecb_inline uint32_t
305ecb_rotr32 (uint32_t x, unsigned int count)
306{
307 return (x << (32 - count)) | (x >> count);
308}
309
310ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
311ecb_inline uint32_t
312ecb_rotl32 (uint32_t x, unsigned int count)
313{
314 return (x >> (32 - count)) | (x << count);
315}
316
317ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
318ecb_inline uint64_t
319ecb_rotr64 (uint64_t x, unsigned int count)
320{
321 return (x << (64 - count)) | (x >> count);
322}
323
324ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
325ecb_inline uint64_t
326ecb_rotl64 (uint64_t x, unsigned int count)
327{
328 return (x >> (64 - count)) | (x << count);
329}
330
331#endif 389#endif
332 390

Diff Legend

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