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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 1.5 by root, Sun Jul 24 03:32:54 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
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
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 && 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) && 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
50#ifndef __cplusplus 111#if __cplusplus
51# if __STDC_VERSION__ >= 199901L 112 #define ecb_inline static inline
52# define ECB_INLINE static inline 113#elif ECB_GCC_VERSION(2,5)
53typedef _Bool ecb_bool; 114 #define ecb_inline static __inline__
115#elif ECB_C99
116 #define ecb_inline static inline
54# else 117#else
55# define ECB_INLINE static inline /* yeah! */ 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
56typedef int ecb_bool; 129typedef int ecb_bool;
57# endif
58#else
59# define ECB_INLINE static inline
60typedef bool ecb_bool;
61#endif
62 130
63#define ECB_CONCAT_(a, b) a ## b 131#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 132#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a 133#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 134#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67 135
68#define ECB_HEADER_INLINE ECB_INLINE 136#define ecb_function_ ecb_inline
69 137
70#if ECB_GCC_VERSION(3,1) 138#if ECB_GCC_VERSION(3,1)
71# define ecb_attribute(attrlist) __attribute__(attrlist) 139 #define ecb_attribute(attrlist) __attribute__(attrlist)
72# define ecb_is_constant(expr) __builtin_constant_p (expr) 140 #define ecb_is_constant(expr) __builtin_constant_p (expr)
73# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 141 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
74# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 142 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
75#else 143#else
76# define ecb_attribute(attrlist) 144 #define ecb_attribute(attrlist)
77# define ecb_is_constant(expr) 0 145 #define ecb_is_constant(expr) 0
78# define ecb_expect(expr,value) (expr) 146 #define ecb_expect(expr,value) (expr)
79# define ecb_prefetch(addr,rw,locality) 147 #define ecb_prefetch(addr,rw,locality)
80#endif 148#endif
81 149
82/* no emulation for ecb_decltype */ 150/* no emulation for ecb_decltype */
83#if ECB_GCC_VERSION(4,5) 151#if ECB_GCC_VERSION(4,5)
84# define ecb_decltype(x) __decltype(x) 152 #define ecb_decltype(x) __decltype(x)
85#elif ECB_GCC_VERSION(3,0) 153#elif ECB_GCC_VERSION(3,0)
86# define ecb_decltype(x) typeof(x) 154 #define ecb_decltype(x) __typeof(x)
87#endif 155#endif
88 156
89#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90#define ecb_noinline ecb_attribute ((__noinline__)) 157#define ecb_noinline ecb_attribute ((__noinline__))
91#define ecb_noreturn ecb_attribute ((__noreturn__)) 158#define ecb_noreturn ecb_attribute ((__noreturn__))
92#define ecb_unused ecb_attribute ((__unused__)) 159#define ecb_unused ecb_attribute ((__unused__))
93#define ecb_const ecb_attribute ((__const__)) 160#define ecb_const ecb_attribute ((__const__))
94#define ecb_pure ecb_attribute ((__pure__)) 161#define ecb_pure ecb_attribute ((__pure__))
162
163#if ECB_GCC_VERSION(4,3)
164 #define ecb_artificial ecb_attribute ((__artificial__))
95#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 165 #define ecb_hot ecb_attribute ((__hot__))
96#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 166 #define ecb_cold ecb_attribute ((__cold__))
167#else
168 #define ecb_artificial
169 #define ecb_hot
170 #define ecb_cold
171#endif
97 172
98/* put into if's if you are very sure that the expression */ 173/* put around conditional expressions if you are very sure that the */
99/* is mostly true or mostly false. note that these return */ 174/* expression is mostly true or mostly false. note that these return */
100/* booleans, not the expression. */ 175/* booleans, not the expression. */
101#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 176#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 177#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
178/* for compatibility to the rest of the world */
103#define ecb_likely(expr) ecb_expect_true (expr) 179#define ecb_likely(expr) ecb_expect_true (expr)
104#define ecb_unlikely(expr) ecb_expect_false (expr) 180#define ecb_unlikely(expr) ecb_expect_false (expr)
105 181
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 */
267ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
268ecb_function_ int
269ecb_popcount64 (uint64_t x)
270{
271 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
272}
273
274ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
275ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
276ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
277ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
278ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
279ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
280ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
281ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
282
283ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
284ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
285ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
286ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
287ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
288ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
289ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
290ecb_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
106/* try to tell the compiler that some condition is definitely true */ 327/* try to tell the compiler that some condition is definitely true */
107#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 328#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
108 329
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; 330ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
177ECB_HEADER_INLINE unsigned char 331ecb_function_ unsigned char
178ecb_byteorder_helper (void) 332ecb_byteorder_helper (void)
179{ 333{
180 const uint32_t u = 0x11223344; 334 const uint32_t u = 0x11223344;
181 return *(unsigned char *)&u; 335 return *(unsigned char *)&u;
182} 336}
183 337
184ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 338ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
185ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 339ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
186ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 340ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
187ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 341ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
188 342
189#if ECB_GCC_VERSION(3,0) 343#if ECB_GCC_VERSION(3,0) || ECB_C99
190# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 344 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191#else 345#else
192# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 346 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
193#endif 347#endif
194 348
195#if ecb_cplusplus_does_not_suck 349#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) 350 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
197template<typename T, int N> 351 template<typename T, int N>
198static inline int ecb_array_length (const T (&arr)[N]) 352 static inline int ecb_array_length (const T (&arr)[N])
199{ 353 {
200 return N; 354 return N;
201} 355 }
202#else 356#else
203#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 357 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
204#endif 358#endif
205 359
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 360#endif
221 361

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