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Comparing libecb/ecb.h (file contents):
Revision 1.40 by root, Sat Jun 11 17:34:57 2011 UTC vs.
Revision 1.55 by root, Tue Jul 26 09:59:36 2011 UTC

… …
28 */ 28 */
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33#ifdef _WIN32
34 typedef signed char int8_t;
35 typedef unsigned char uint8_t;
36 typedef signed short int16_t;
37 typedef unsigned short uint16_t;
38 typedef signed int int32_t;
39 typedef unsigned int uint32_t;
40 #if __GNUC__
41 typedef signed long long int64_t;
42 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t;
46 #endif
47#else
33#include <inttypes.h> 48 #include <inttypes.h>
49#endif
34 50
35/* many compilers define _GNUC_ to some versions but then only implement 51/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions, 52 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers. 53 * causing enourmous grief in return for some better fake benchmark numbers.
38 * or so. 54 * or so.
39 * 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
40 * 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.
41 */ 57 */
42#ifndef ECB_GCC_VERSION 58#ifndef ECB_GCC_VERSION
43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
44 #define ECB_GCC_VERSION(major,minor) 0 60 #define ECB_GCC_VERSION(major,minor) 0
45 #else 61 #else
46 #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)))
47 #endif 63 #endif
48#endif 64#endif
49 65
66/*****************************************************************************/
67
68#ifndef ECB_MEMORY_FENCE
69 #if ECB_GCC_VERSION(2,5)
70 #if __x86
71 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
72 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
73 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE /* better be safe than sorry */
74 #elif __amd64
75 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
76 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
77 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence")
78 #endif
79 #endif
80#endif
81
82#ifndef ECB_MEMORY_FENCE
83 #if ECB_GCC_VERSION(4,4)
84 #define ECB_MEMORY_FENCE __sync_synchronize ()
85 #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 ); })
87 #elif _MSC_VER >= 1400 && 0 /* TODO: only true when using volatiles */
88 #define ECB_MEMORY_FENCE do { } while (0)
89 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
90 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
91 #elif defined(_WIN32)
92 #include <WinNT.h>
93 #define ECB_MEMORY_FENCE MemoryBarrier ()
94 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
95 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
96 #endif
97#endif
98
99#ifndef ECB_MEMORY_FENCE
100 #include <pthread.h>
101
102 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)
104 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
105 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
106#endif
107
108/*****************************************************************************/
109
50#define ECB_C99 (__STDC_VERSION__ >= 199901L) 110#define ECB_C99 (__STDC_VERSION__ >= 199901L)
51 111
52#if __cplusplus 112#if __cplusplus
53 #define ECB_INLINE static inline 113 #define ecb_inline static inline
54#elif ECB_GCC_VERSION(2,5) 114#elif ECB_GCC_VERSION(2,5)
55 #define ECB_INLINE static __inline__ 115 #define ecb_inline static __inline__
56#elif ECB_C99 116#elif ECB_C99
57 #define ECB_INLINE static inline 117 #define ecb_inline static inline
58#else 118#else
59 #define ECB_INLINE static 119 #define ecb_inline static
60#endif 120#endif
61 121
62#if ECB_GCC_VERSION(3,3) 122#if ECB_GCC_VERSION(3,3)
63 #define ecb_restrict __restrict__ 123 #define ecb_restrict __restrict__
64#elif ECB_C99 124#elif ECB_C99
… …
72#define ECB_CONCAT_(a, b) a ## b 132#define ECB_CONCAT_(a, b) a ## b
73#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 133#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
74#define ECB_STRINGIFY_(a) # a 134#define ECB_STRINGIFY_(a) # a
75#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 135#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
76 136
77#define ecb_function_ ECB_INLINE 137#define ecb_function_ ecb_inline
78 138
79#if ECB_GCC_VERSION(3,1) 139#if ECB_GCC_VERSION(3,1)
80 #define ecb_attribute(attrlist) __attribute__(attrlist) 140 #define ecb_attribute(attrlist) __attribute__(attrlist)
81 #define ecb_is_constant(expr) __builtin_constant_p (expr) 141 #define ecb_is_constant(expr) __builtin_constant_p (expr)
82 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 142 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
… …
118#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 178#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
119/* for compatibility to the rest of the world */ 179/* for compatibility to the rest of the world */
120#define ecb_likely(expr) ecb_expect_true (expr) 180#define ecb_likely(expr) ecb_expect_true (expr)
121#define ecb_unlikely(expr) ecb_expect_false (expr) 181#define ecb_unlikely(expr) ecb_expect_false (expr)
122 182
123/* try to tell the compiler that some condition is definitely true */
124#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
125
126/* count trailing zero bits and count # of one bits */ 183/* count trailing zero bits and count # of one bits */
127#if ECB_GCC_VERSION(3,4) 184#if ECB_GCC_VERSION(3,4)
185 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
186 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
187 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
128 #define ecb_ctz32(x) __builtin_ctz (x) 188 #define ecb_ctz32(x) __builtin_ctz (x)
189 #define ecb_ctz64(x) __builtin_ctzll (x)
129 #define ecb_popcount32(x) __builtin_popcount (x) 190 #define ecb_popcount32(x) __builtin_popcount (x)
191 /* no popcountll */
130#else 192#else
131 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; 193 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
132 ecb_function_ int 194 ecb_function_ int
133 ecb_ctz32 (uint32_t x) 195 ecb_ctz32 (uint32_t x)
134 { 196 {
135 int r = 0; 197 int r = 0;
136 198
137 x &= -x; /* this isolates the lowest bit */ 199 x &= ~x + 1; /* this isolates the lowest bit */
138 200
201#if ECB_branchless_on_i386
202 r += !!(x & 0xaaaaaaaa) << 0;
203 r += !!(x & 0xcccccccc) << 1;
204 r += !!(x & 0xf0f0f0f0) << 2;
205 r += !!(x & 0xff00ff00) << 3;
206 r += !!(x & 0xffff0000) << 4;
207#else
139 if (x & 0xaaaaaaaa) r += 1; 208 if (x & 0xaaaaaaaa) r += 1;
140 if (x & 0xcccccccc) r += 2; 209 if (x & 0xcccccccc) r += 2;
141 if (x & 0xf0f0f0f0) r += 4; 210 if (x & 0xf0f0f0f0) r += 4;
142 if (x & 0xff00ff00) r += 8; 211 if (x & 0xff00ff00) r += 8;
143 if (x & 0xffff0000) r += 16; 212 if (x & 0xffff0000) r += 16;
213#endif
144 214
145 return r; 215 return r;
216 }
217
218 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
219 ecb_function_ int
220 ecb_ctz64 (uint64_t x)
221 {
222 int shift = x & 0xffffffffU ? 0 : 32;
223 return ecb_ctz32 (x >> shift) + shift;
146 } 224 }
147 225
148 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; 226 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
149 ecb_function_ int 227 ecb_function_ int
150 ecb_popcount32 (uint32_t x) 228 ecb_popcount32 (uint32_t x)
… …
154 x = ((x >> 4) + x) & 0x0f0f0f0f; 232 x = ((x >> 4) + x) & 0x0f0f0f0f;
155 x *= 0x01010101; 233 x *= 0x01010101;
156 234
157 return x >> 24; 235 return x >> 24;
158 } 236 }
237
238 /* you have the choice beetween something with a table lookup, */
239 /* something using lots of bit arithmetic and a simple loop */
240 /* we went for the loop */
241 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
242 ecb_function_ int ecb_ld32 (uint32_t x)
243 {
244 int r = 0;
245
246 if (x >> 16) { x >>= 16; r += 16; }
247 if (x >> 8) { x >>= 8; r += 8; }
248 if (x >> 4) { x >>= 4; r += 4; }
249 if (x >> 2) { x >>= 2; r += 2; }
250 if (x >> 1) { r += 1; }
251
252 return r;
253 }
254
255 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
256 ecb_function_ int ecb_ld64 (uint64_t x)
257 {
258 int r = 0;
259
260 if (x >> 32) { x >>= 32; r += 32; }
261
262 return r + ecb_ld32 (x);
263 }
159#endif 264#endif
265
266/* popcount64 is only available on 64 bit cpus as gcc builtin */
267/* so for this version we are lazy */
268ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
269ecb_function_ int
270ecb_popcount64 (uint64_t x)
271{
272 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
273}
274
275ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
276ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
277ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
278ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
279ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
280ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
281ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
282ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
283
284ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
285ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
286ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
287ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
288ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
289ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
290ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
291ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
160 292
161#if ECB_GCC_VERSION(4,3) 293#if ECB_GCC_VERSION(4,3)
162 #define ecb_bswap32(x) __builtin_bswap32 (x)
163 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) 294 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
295 #define ecb_bswap32(x) __builtin_bswap32 (x)
296 #define ecb_bswap64(x) __builtin_bswap64 (x)
164#else 297#else
298 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
299 ecb_function_ uint16_t
300 ecb_bswap16 (uint16_t x)
301 {
302 return ecb_rotl16 (x, 8);
303 }
304
165 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; 305 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
166 ecb_function_ uint32_t 306 ecb_function_ uint32_t
167 ecb_bswap32 (uint32_t x) 307 ecb_bswap32 (uint32_t x)
168 { 308 {
169 return (x >> 24) 309 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
170 | ((x >> 8) & 0x0000ff00)
171 | ((x << 8) & 0x00ff0000)
172 | (x << 24);
173 } 310 }
174 311
175 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; 312 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
176 ecb_function_ uint32_t 313 ecb_function_ uint64_t
177 ecb_bswap16 (uint32_t x) 314 ecb_bswap64 (uint64_t x)
178 { 315 {
179 return ((x >> 8) & 0xff) 316 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
180 | ((x << 8) & 0x00ff0000)
181 | (x << 24);
182 } 317 }
183#endif 318#endif
184 319
185#if ECB_GCC_VERSION(4,5) 320#if ECB_GCC_VERSION(4,5)
186 #define ecb_unreachable() __builtin_unreachable () 321 #define ecb_unreachable() __builtin_unreachable ()
187#else 322#else
188 /* this seems to work fine, but gcc always emits a warning for it :/ */ 323 /* this seems to work fine, but gcc always emits a warning for it :/ */
189 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 324 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
190 ecb_function_ void ecb_unreachable (void) { } 325 ecb_function_ void ecb_unreachable (void) { }
191#endif 326#endif
327
328/* try to tell the compiler that some condition is definitely true */
329#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
192 330
193ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 331ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
194ecb_function_ unsigned char 332ecb_function_ unsigned char
195ecb_byteorder_helper (void) 333ecb_byteorder_helper (void)
196{ 334{
197 const uint32_t u = 0x11223344; 335 const uint32_t u = 0x11223344;
198 return *(unsigned char *)&u; 336 return *(unsigned char *)&u;
199} 337}
200 338
201ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 339ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
202ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 340ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
203ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 341ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
204ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 342ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
205 343
206#if ECB_GCC_VERSION(3,0) || ECB_C99 344#if ECB_GCC_VERSION(3,0) || ECB_C99
207 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 345 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
208#else 346#else
209 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 347 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
… …
218 } 356 }
219#else 357#else
220 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 358 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
221#endif 359#endif
222 360
223ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
224ECB_INLINE uint32_t
225ecb_rotr32 (uint32_t x, unsigned int count)
226{
227 return (x << (32 - count)) | (x >> count);
228}
229
230ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
231ECB_INLINE uint32_t
232ecb_rotl32 (uint32_t x, unsigned int count)
233{
234 return (x >> (32 - count)) | (x << count);
235}
236
237#endif 361#endif
238 362

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