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Comparing libeio/ecb.h (file contents):
Revision 1.1 by root, Fri Jun 10 12:35:18 2011 UTC vs.
Revision 1.7 by root, Wed Aug 3 15:25:38 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)))
63 #endif
47# 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 /* non-lock xchg might be enough */
73 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
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") /* play safe - not needed in any current cpu */
78 #endif
48#endif 79 #endif
80#endif
49 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 /* VC++ 2005 */
88 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
89 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
90 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
91 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
92 #elif defined(_WIN32)
93 #include <WinNT.h>
94 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
95 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
96 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
97 #endif
98#endif
99
100#ifndef ECB_MEMORY_FENCE
101 /*
102 * if you get undefined symbol references to pthread_mutex_lock,
103 * or failure to find pthread.h, then you should implement
104 * the ECB_MEMORY_FENCE operations for your cpu/compiler
105 * OR proide pthread.h and link against the posix thread library
106 * of your system.
107 */
108 #include <pthread.h>
109
110 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
111 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
112 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
113 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
114#endif
115
116/*****************************************************************************/
117
118#define ECB_C99 (__STDC_VERSION__ >= 199901L)
119
50#ifndef __cplusplus 120#if __cplusplus
51# if __STDC_VERSION__ >= 199901L 121 #define ecb_inline static inline
52# define ECB_INLINE static inline 122#elif ECB_GCC_VERSION(2,5)
53typedef _Bool ecb_bool; 123 #define ecb_inline static __inline__
124#elif ECB_C99
125 #define ecb_inline static inline
54# else 126#else
55# define ECB_INLINE static inline /* yeah! */ 127 #define ecb_inline static
128#endif
129
130#if ECB_GCC_VERSION(3,3)
131 #define ecb_restrict __restrict__
132#elif ECB_C99
133 #define ecb_restrict restrict
134#else
135 #define ecb_restrict
136#endif
137
56typedef int ecb_bool; 138typedef int ecb_bool;
57# endif
58#else
59# define ECB_INLINE static inline
60typedef bool ecb_bool;
61#endif
62 139
63#define ECB_CONCAT_(a, b) a ## b 140#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 141#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a 142#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 143#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67 144
68#define ECB_HEADER_INLINE ECB_INLINE 145#define ecb_function_ ecb_inline
69 146
70#if ECB_GCC_VERSION(3,1) 147#if ECB_GCC_VERSION(3,1)
71# define ecb_attribute(attrlist) __attribute__(attrlist) 148 #define ecb_attribute(attrlist) __attribute__(attrlist)
72# define ecb_is_constant(expr) __builtin_constant_p (expr) 149 #define ecb_is_constant(expr) __builtin_constant_p (expr)
73# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 150 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
74# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 151 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
75#else 152#else
76# define ecb_attribute(attrlist) 153 #define ecb_attribute(attrlist)
77# define ecb_is_constant(expr) 0 154 #define ecb_is_constant(expr) 0
78# define ecb_expect(expr,value) (expr) 155 #define ecb_expect(expr,value) (expr)
79# define ecb_prefetch(addr,rw,locality) 156 #define ecb_prefetch(addr,rw,locality)
80#endif 157#endif
81 158
82/* no emulation for ecb_decltype */ 159/* no emulation for ecb_decltype */
83#if ECB_GCC_VERSION(4,5) 160#if ECB_GCC_VERSION(4,5)
84# define ecb_decltype(x) __decltype(x) 161 #define ecb_decltype(x) __decltype(x)
85#elif ECB_GCC_VERSION(3,0) 162#elif ECB_GCC_VERSION(3,0)
86# define ecb_decltype(x) typeof(x) 163 #define ecb_decltype(x) __typeof(x)
87#endif 164#endif
88 165
89#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90#define ecb_noinline ecb_attribute ((__noinline__)) 166#define ecb_noinline ecb_attribute ((__noinline__))
91#define ecb_noreturn ecb_attribute ((__noreturn__)) 167#define ecb_noreturn ecb_attribute ((__noreturn__))
92#define ecb_unused ecb_attribute ((__unused__)) 168#define ecb_unused ecb_attribute ((__unused__))
93#define ecb_const ecb_attribute ((__const__)) 169#define ecb_const ecb_attribute ((__const__))
94#define ecb_pure ecb_attribute ((__pure__)) 170#define ecb_pure ecb_attribute ((__pure__))
171
172#if ECB_GCC_VERSION(4,3)
173 #define ecb_artificial ecb_attribute ((__artificial__))
95#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 174 #define ecb_hot ecb_attribute ((__hot__))
96#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 175 #define ecb_cold ecb_attribute ((__cold__))
176#else
177 #define ecb_artificial
178 #define ecb_hot
179 #define ecb_cold
180#endif
97 181
98/* put into if's if you are very sure that the expression */ 182/* put around conditional expressions if you are very sure that the */
99/* is mostly true or mostly false. note that these return */ 183/* expression is mostly true or mostly false. note that these return */
100/* booleans, not the expression. */ 184/* booleans, not the expression. */
101#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 185#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 186#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
187/* for compatibility to the rest of the world */
103#define ecb_likely(expr) ecb_expect_true (expr) 188#define ecb_likely(expr) ecb_expect_true (expr)
104#define ecb_unlikely(expr) ecb_expect_false (expr) 189#define ecb_unlikely(expr) ecb_expect_false (expr)
105 190
191/* count trailing zero bits and count # of one bits */
192#if ECB_GCC_VERSION(3,4)
193 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
194 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
195 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
196 #define ecb_ctz32(x) __builtin_ctz (x)
197 #define ecb_ctz64(x) __builtin_ctzll (x)
198 #define ecb_popcount32(x) __builtin_popcount (x)
199 /* no popcountll */
200#else
201 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
202 ecb_function_ int
203 ecb_ctz32 (uint32_t x)
204 {
205 int r = 0;
206
207 x &= ~x + 1; /* this isolates the lowest bit */
208
209#if ECB_branchless_on_i386
210 r += !!(x & 0xaaaaaaaa) << 0;
211 r += !!(x & 0xcccccccc) << 1;
212 r += !!(x & 0xf0f0f0f0) << 2;
213 r += !!(x & 0xff00ff00) << 3;
214 r += !!(x & 0xffff0000) << 4;
215#else
216 if (x & 0xaaaaaaaa) r += 1;
217 if (x & 0xcccccccc) r += 2;
218 if (x & 0xf0f0f0f0) r += 4;
219 if (x & 0xff00ff00) r += 8;
220 if (x & 0xffff0000) r += 16;
221#endif
222
223 return r;
224 }
225
226 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
227 ecb_function_ int
228 ecb_ctz64 (uint64_t x)
229 {
230 int shift = x & 0xffffffffU ? 0 : 32;
231 return ecb_ctz32 (x >> shift) + shift;
232 }
233
234 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
235 ecb_function_ int
236 ecb_popcount32 (uint32_t x)
237 {
238 x -= (x >> 1) & 0x55555555;
239 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
240 x = ((x >> 4) + x) & 0x0f0f0f0f;
241 x *= 0x01010101;
242
243 return x >> 24;
244 }
245
246 /* you have the choice beetween something with a table lookup, */
247 /* something using lots of bit arithmetic and a simple loop */
248 /* we went for the loop */
249 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
250 ecb_function_ int ecb_ld32 (uint32_t x)
251 {
252 int r = 0;
253
254 if (x >> 16) { x >>= 16; r += 16; }
255 if (x >> 8) { x >>= 8; r += 8; }
256 if (x >> 4) { x >>= 4; r += 4; }
257 if (x >> 2) { x >>= 2; r += 2; }
258 if (x >> 1) { r += 1; }
259
260 return r;
261 }
262
263 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
264 ecb_function_ int ecb_ld64 (uint64_t x)
265 {
266 int r = 0;
267
268 if (x >> 32) { x >>= 32; r += 32; }
269
270 return r + ecb_ld32 (x);
271 }
272#endif
273
274/* popcount64 is only available on 64 bit cpus as gcc builtin */
275/* so for this version we are lazy */
276ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
277ecb_function_ int
278ecb_popcount64 (uint64_t x)
279{
280 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
281}
282
283ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
284ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
285ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
286ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
287ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
288ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
289ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
290ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
291
292ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
293ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
294ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
295ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
296ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
297ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
298ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
299ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
300
301#if ECB_GCC_VERSION(4,3)
302 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
303 #define ecb_bswap32(x) __builtin_bswap32 (x)
304 #define ecb_bswap64(x) __builtin_bswap64 (x)
305#else
306 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
307 ecb_function_ uint16_t
308 ecb_bswap16 (uint16_t x)
309 {
310 return ecb_rotl16 (x, 8);
311 }
312
313 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
314 ecb_function_ uint32_t
315 ecb_bswap32 (uint32_t x)
316 {
317 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
318 }
319
320 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
321 ecb_function_ uint64_t
322 ecb_bswap64 (uint64_t x)
323 {
324 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
325 }
326#endif
327
328#if ECB_GCC_VERSION(4,5)
329 #define ecb_unreachable() __builtin_unreachable ()
330#else
331 /* this seems to work fine, but gcc always emits a warning for it :/ */
332 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
333 ecb_function_ void ecb_unreachable (void) { }
334#endif
335
106/* try to tell the compiler that some condition is definitely true */ 336/* try to tell the compiler that some condition is definitely true */
107#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 337#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
108 338
109/* count trailing zero bits and count # of one bits */
110#if ECB_GCC_VERSION(3,4)
111#define ecb_ctz32(x) __builtin_ctz (x)
112#define ecb_popcount32(x) __builtin_popcount (x)
113#else
114ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
115ECB_HEADER_INLINE int
116ecb_ctz32 (uint32_t x)
117{
118 int r = 0;
119
120 x &= -x; /* this isolates the lowest bit */
121
122 if (x & 0xaaaaaaaa) r += 1;
123 if (x & 0xcccccccc) r += 2;
124 if (x & 0xf0f0f0f0) r += 4;
125 if (x & 0xff00ff00) r += 8;
126 if (x & 0xffff0000) r += 16;
127
128 return r;
129}
130
131ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
132ECB_HEADER_INLINE int
133ecb_popcount32 (uint32_t x)
134{
135 x -= (x >> 1) & 0x55555555;
136 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
137 x = ((x >> 4) + x) & 0x0f0f0f0f;
138 x *= 0x01010101;
139
140 return x >> 24;
141}
142#endif
143
144#if ECB_GCC_VERSION(4,3)
145# define ecb_bswap32(x) __builtin_bswap32 (x)
146# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
147#else
148ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
149ECB_HEADER_INLINE uint32_t
150ecb_bswap32 (uint32_t x)
151{
152 return (x >> 24)
153 | ((x >> 8) & 0x0000ff00)
154 | ((x << 8) & 0x00ff0000)
155 | (x << 24);
156}
157
158ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
159ECB_HEADER_INLINE uint32_t
160ecb_bswap16 (uint32_t x)
161{
162 return ((x >> 8) & 0xff)
163 | ((x << 8) & 0x00ff0000)
164 | (x << 24);
165}
166#endif
167
168#if ECB_GCC_VERSION(4,5)
169# define ecb_unreachable() __builtin_unreachable ()
170#else
171/* this seems to work fine, but gcc always emits a warning for it :/ */
172ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
173ECB_HEADER_INLINE void ecb_unreachable (void) { }
174#endif
175
176ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; 339ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
177ECB_HEADER_INLINE unsigned char 340ecb_function_ unsigned char
178ecb_byteorder_helper (void) 341ecb_byteorder_helper (void)
179{ 342{
180 const uint32_t u = 0x11223344; 343 const uint32_t u = 0x11223344;
181 return *(unsigned char *)&u; 344 return *(unsigned char *)&u;
182} 345}
183 346
184ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 347ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
185ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 348ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
186ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 349ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
187ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 350ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
188 351
189#if ECB_GCC_VERSION(3,0) 352#if ECB_GCC_VERSION(3,0) || ECB_C99
190# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 353 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191#else 354#else
192# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 355 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
193#endif 356#endif
194 357
195#if ecb_cplusplus_does_not_suck 358#if ecb_cplusplus_does_not_suck
196// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 359 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
197template<typename T, int N> 360 template<typename T, int N>
198static inline int ecb_array_length (const T (&arr)[N]) 361 static inline int ecb_array_length (const T (&arr)[N])
199{ 362 {
200 return N; 363 return N;
201} 364 }
202#else 365#else
203#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 366 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
204#endif 367#endif
205 368
206ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
207ECB_INLINE uint32_t
208ecb_rotr32 (uint32_t x, unsigned int count)
209{
210 return (x << (32 - count)) | (x >> count);
211}
212
213ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
214ECB_INLINE uint32_t
215ecb_rotl32 (uint32_t x, unsigned int count)
216{
217 return (x >> (32 - count)) | (x << count);
218}
219
220#endif 369#endif
221 370

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