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/cvs/libecb/ecb.h
Revision: 1.54
Committed: Wed Jul 20 00:38:30 2011 UTC (12 years, 10 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.53: +1 -1 lines
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# Content
1 /*
2 * libecb - http://software.schmorp.de/pkg/libecb
3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #ifndef ECB_H
31 #define ECB_H
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
48 #include <inttypes.h>
49 #endif
50
51 /* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions,
53 * causing enourmous grief in return for some better fake benchmark numbers.
54 * or so.
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.
57 */
58 #ifndef ECB_GCC_VERSION
59 #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
61 #else
62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif
64 #endif
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
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) && defined(MemoryBarrier)
92 #define ECB_MEMORY_FENCE MemoryBarrier ()
93 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
94 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
95 #endif
96 #endif
97
98 #ifndef ECB_MEMORY_FENCE
99 #include <pthread.h>
100
101 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)
103 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
104 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
105 #endif
106
107 /*****************************************************************************/
108
109 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
110
111 #if __cplusplus
112 #define ecb_inline static inline
113 #elif ECB_GCC_VERSION(2,5)
114 #define ecb_inline static __inline__
115 #elif ECB_C99
116 #define ecb_inline static inline
117 #else
118 #define ecb_inline static
119 #endif
120
121 #if ECB_GCC_VERSION(3,3)
122 #define ecb_restrict __restrict__
123 #elif ECB_C99
124 #define ecb_restrict restrict
125 #else
126 #define ecb_restrict
127 #endif
128
129 typedef int ecb_bool;
130
131 #define ECB_CONCAT_(a, b) a ## b
132 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
133 #define ECB_STRINGIFY_(a) # a
134 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
135
136 #define ecb_function_ ecb_inline
137
138 #if ECB_GCC_VERSION(3,1)
139 #define ecb_attribute(attrlist) __attribute__(attrlist)
140 #define ecb_is_constant(expr) __builtin_constant_p (expr)
141 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
142 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
143 #else
144 #define ecb_attribute(attrlist)
145 #define ecb_is_constant(expr) 0
146 #define ecb_expect(expr,value) (expr)
147 #define ecb_prefetch(addr,rw,locality)
148 #endif
149
150 /* no emulation for ecb_decltype */
151 #if ECB_GCC_VERSION(4,5)
152 #define ecb_decltype(x) __decltype(x)
153 #elif ECB_GCC_VERSION(3,0)
154 #define ecb_decltype(x) __typeof(x)
155 #endif
156
157 #define ecb_noinline ecb_attribute ((__noinline__))
158 #define ecb_noreturn ecb_attribute ((__noreturn__))
159 #define ecb_unused ecb_attribute ((__unused__))
160 #define ecb_const ecb_attribute ((__const__))
161 #define ecb_pure ecb_attribute ((__pure__))
162
163 #if ECB_GCC_VERSION(4,3)
164 #define ecb_artificial ecb_attribute ((__artificial__))
165 #define ecb_hot ecb_attribute ((__hot__))
166 #define ecb_cold ecb_attribute ((__cold__))
167 #else
168 #define ecb_artificial
169 #define ecb_hot
170 #define ecb_cold
171 #endif
172
173 /* put around conditional expressions if you are very sure that the */
174 /* expression is mostly true or mostly false. note that these return */
175 /* booleans, not the expression. */
176 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
177 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
178 /* for compatibility to the rest of the world */
179 #define ecb_likely(expr) ecb_expect_true (expr)
180 #define ecb_unlikely(expr) ecb_expect_false (expr)
181
182 /* count trailing zero bits and count # of one bits */
183 #if ECB_GCC_VERSION(3,4)
184 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
185 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
186 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
187 #define ecb_ctz32(x) __builtin_ctz (x)
188 #define ecb_ctz64(x) __builtin_ctzll (x)
189 #define ecb_popcount32(x) __builtin_popcount (x)
190 /* no popcountll */
191 #else
192 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
193 ecb_function_ int
194 ecb_ctz32 (uint32_t x)
195 {
196 int r = 0;
197
198 x &= ~x + 1; /* this isolates the lowest bit */
199
200 #if ECB_branchless_on_i386
201 r += !!(x & 0xaaaaaaaa) << 0;
202 r += !!(x & 0xcccccccc) << 1;
203 r += !!(x & 0xf0f0f0f0) << 2;
204 r += !!(x & 0xff00ff00) << 3;
205 r += !!(x & 0xffff0000) << 4;
206 #else
207 if (x & 0xaaaaaaaa) r += 1;
208 if (x & 0xcccccccc) r += 2;
209 if (x & 0xf0f0f0f0) r += 4;
210 if (x & 0xff00ff00) r += 8;
211 if (x & 0xffff0000) r += 16;
212 #endif
213
214 return r;
215 }
216
217 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
218 ecb_function_ int
219 ecb_ctz64 (uint64_t x)
220 {
221 int shift = x & 0xffffffffU ? 0 : 32;
222 return ecb_ctz32 (x >> shift) + shift;
223 }
224
225 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
226 ecb_function_ int
227 ecb_popcount32 (uint32_t x)
228 {
229 x -= (x >> 1) & 0x55555555;
230 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
231 x = ((x >> 4) + x) & 0x0f0f0f0f;
232 x *= 0x01010101;
233
234 return x >> 24;
235 }
236
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;
241 ecb_function_ int ecb_ld32 (uint32_t x)
242 {
243 int r = 0;
244
245 if (x >> 16) { x >>= 16; r += 16; }
246 if (x >> 8) { x >>= 8; r += 8; }
247 if (x >> 4) { x >>= 4; r += 4; }
248 if (x >> 2) { x >>= 2; r += 2; }
249 if (x >> 1) { r += 1; }
250
251 return r;
252 }
253
254 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
255 ecb_function_ int ecb_ld64 (uint64_t x)
256 {
257 int r = 0;
258
259 if (x >> 32) { x >>= 32; r += 32; }
260
261 return r + ecb_ld32 (x);
262 }
263 #endif
264
265 /* popcount64 is only available on 64 bit cpus as gcc builtin */
266 /* so for this version we are lazy */
267 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
268 ecb_function_ int
269 ecb_popcount64 (uint64_t x)
270 {
271 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
272 }
273
274 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
275 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
276 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
277 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
278 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
279 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
280 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
281 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
282
283 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
284 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
285 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
286 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
287 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
288 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
289 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
290 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
291
292 #if ECB_GCC_VERSION(4,3)
293 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
294 #define ecb_bswap32(x) __builtin_bswap32 (x)
295 #define ecb_bswap64(x) __builtin_bswap64 (x)
296 #else
297 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
298 ecb_function_ uint16_t
299 ecb_bswap16 (uint16_t x)
300 {
301 return ecb_rotl16 (x, 8);
302 }
303
304 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
305 ecb_function_ uint32_t
306 ecb_bswap32 (uint32_t x)
307 {
308 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
309 }
310
311 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
312 ecb_function_ uint64_t
313 ecb_bswap64 (uint64_t x)
314 {
315 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
316 }
317 #endif
318
319 #if ECB_GCC_VERSION(4,5)
320 #define ecb_unreachable() __builtin_unreachable ()
321 #else
322 /* this seems to work fine, but gcc always emits a warning for it :/ */
323 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
324 ecb_function_ void ecb_unreachable (void) { }
325 #endif
326
327 /* try to tell the compiler that some condition is definitely true */
328 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
329
330 ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
331 ecb_function_ unsigned char
332 ecb_byteorder_helper (void)
333 {
334 const uint32_t u = 0x11223344;
335 return *(unsigned char *)&u;
336 }
337
338 ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
339 ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
340 ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
341 ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
342
343 #if ECB_GCC_VERSION(3,0) || ECB_C99
344 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
345 #else
346 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
347 #endif
348
349 #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) */
351 template<typename T, int N>
352 static inline int ecb_array_length (const T (&arr)[N])
353 {
354 return N;
355 }
356 #else
357 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
358 #endif
359
360 #endif
361