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

Comparing libeio/ecb.h (file contents):
Revision 1.1 by root, Fri Jun 10 12:35:18 2011 UTC vs.
Revision 1.2 by root, Fri Jun 17 18:55:42 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
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
48#endif
49 65
66#define ECB_C99 (__STDC_VERSION__ >= 199901L)
67
50#ifndef __cplusplus 68#if __cplusplus
51# if __STDC_VERSION__ >= 199901L 69 #define ecb_inline static inline
52# define ECB_INLINE static inline 70#elif ECB_GCC_VERSION(2,5)
53typedef _Bool ecb_bool; 71 #define ecb_inline static __inline__
72#elif ECB_C99
73 #define ecb_inline static inline
54# else 74#else
55# define ECB_INLINE static inline /* yeah! */ 75 #define ecb_inline static
76#endif
77
78#if ECB_GCC_VERSION(3,3)
79 #define ecb_restrict __restrict__
80#elif ECB_C99
81 #define ecb_restrict restrict
82#else
83 #define ecb_restrict
84#endif
85
56typedef int ecb_bool; 86typedef int ecb_bool;
57# endif
58#else
59# define ECB_INLINE static inline
60typedef bool ecb_bool;
61#endif
62 87
63#define ECB_CONCAT_(a, b) a ## b 88#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 89#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a 90#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 91#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67 92
68#define ECB_HEADER_INLINE ECB_INLINE 93#define ecb_function_ ecb_inline
69 94
70#if ECB_GCC_VERSION(3,1) 95#if ECB_GCC_VERSION(3,1)
71# define ecb_attribute(attrlist) __attribute__(attrlist) 96 #define ecb_attribute(attrlist) __attribute__(attrlist)
72# define ecb_is_constant(expr) __builtin_constant_p (expr) 97 #define ecb_is_constant(expr) __builtin_constant_p (expr)
73# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 98 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
74# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 99 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
75#else 100#else
76# define ecb_attribute(attrlist) 101 #define ecb_attribute(attrlist)
77# define ecb_is_constant(expr) 0 102 #define ecb_is_constant(expr) 0
78# define ecb_expect(expr,value) (expr) 103 #define ecb_expect(expr,value) (expr)
79# define ecb_prefetch(addr,rw,locality) 104 #define ecb_prefetch(addr,rw,locality)
80#endif 105#endif
81 106
82/* no emulation for ecb_decltype */ 107/* no emulation for ecb_decltype */
83#if ECB_GCC_VERSION(4,5) 108#if ECB_GCC_VERSION(4,5)
84# define ecb_decltype(x) __decltype(x) 109 #define ecb_decltype(x) __decltype(x)
85#elif ECB_GCC_VERSION(3,0) 110#elif ECB_GCC_VERSION(3,0)
86# define ecb_decltype(x) typeof(x) 111 #define ecb_decltype(x) __typeof(x)
87#endif 112#endif
88 113
89#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90#define ecb_noinline ecb_attribute ((__noinline__)) 114#define ecb_noinline ecb_attribute ((__noinline__))
91#define ecb_noreturn ecb_attribute ((__noreturn__)) 115#define ecb_noreturn ecb_attribute ((__noreturn__))
92#define ecb_unused ecb_attribute ((__unused__)) 116#define ecb_unused ecb_attribute ((__unused__))
93#define ecb_const ecb_attribute ((__const__)) 117#define ecb_const ecb_attribute ((__const__))
94#define ecb_pure ecb_attribute ((__pure__)) 118#define ecb_pure ecb_attribute ((__pure__))
119
120#if ECB_GCC_VERSION(4,3)
121 #define ecb_artificial ecb_attribute ((__artificial__))
95#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 122 #define ecb_hot ecb_attribute ((__hot__))
96#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 123 #define ecb_cold ecb_attribute ((__cold__))
124#else
125 #define ecb_artificial
126 #define ecb_hot
127 #define ecb_cold
128#endif
97 129
98/* put into if's if you are very sure that the expression */ 130/* put around conditional expressions if you are very sure that the */
99/* is mostly true or mostly false. note that these return */ 131/* expression is mostly true or mostly false. note that these return */
100/* booleans, not the expression. */ 132/* booleans, not the expression. */
101#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 133#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 134#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
135/* for compatibility to the rest of the world */
103#define ecb_likely(expr) ecb_expect_true (expr) 136#define ecb_likely(expr) ecb_expect_true (expr)
104#define ecb_unlikely(expr) ecb_expect_false (expr) 137#define ecb_unlikely(expr) ecb_expect_false (expr)
105 138
139/* count trailing zero bits and count # of one bits */
140#if ECB_GCC_VERSION(3,4)
141 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
142 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
143 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
144 #define ecb_ctz32(x) __builtin_ctz (x)
145 #define ecb_ctz64(x) __builtin_ctzll (x)
146 #define ecb_popcount32(x) __builtin_popcount (x)
147 /* no popcountll */
148#else
149 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
150 ecb_function_ int
151 ecb_ctz32 (uint32_t x)
152 {
153 int r = 0;
154
155 x &= ~x + 1; /* this isolates the lowest bit */
156
157 if (x & 0xaaaaaaaa) r += 1;
158 if (x & 0xcccccccc) r += 2;
159 if (x & 0xf0f0f0f0) r += 4;
160 if (x & 0xff00ff00) r += 8;
161 if (x & 0xffff0000) r += 16;
162
163 return r;
164 }
165
166 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
167 ecb_function_ int
168 ecb_ctz64 (uint64_t x)
169 {
170 int shift = x & 0xffffffffU ? 0 : 32;
171 return ecb_ctz (x >> shift) + shift;
172 }
173
174 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
175 ecb_function_ int
176 ecb_popcount32 (uint32_t x)
177 {
178 x -= (x >> 1) & 0x55555555;
179 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
180 x = ((x >> 4) + x) & 0x0f0f0f0f;
181 x *= 0x01010101;
182
183 return x >> 24;
184 }
185
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;
190 ecb_function_ int ecb_ld32 (uint32_t x)
191 {
192 int r = -1;
193
194 do
195 {
196 x >>= 1;
197 ++r;
198 }
199 while (x);
200
201 return r;
202 }
203
204 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
205 ecb_function_ int ecb_ld64 (uint64_t x)
206 {
207 int r = -1;
208
209 do
210 {
211 x >>= 1;
212 ++r;
213 }
214 while (x);
215
216 return r;
217 }
218#endif
219
220/* popcount64 is only available on 64 bit cpus as gcc builtin */
221/* so for this version we are lazy */
222ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
223ecb_function_ int
224ecb_popcount64 (uint64_t x)
225{
226 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
227}
228
229#if ECB_GCC_VERSION(4,3)
230 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
231 #define ecb_bswap32(x) __builtin_bswap32 (x)
232 #define ecb_bswap64(x) __builtin_bswap64 (x)
233#else
234 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const;
235 ecb_function_ uint32_t
236 ecb_bswap16 (uint32_t x)
237 {
238 return ((x >> 8) & 0xff)
239 | ((x << 8) & 0x00ff0000)
240 | (x << 24);
241 }
242
243 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
244 ecb_function_ uint32_t
245 ecb_bswap32 (uint32_t x)
246 {
247 return (x >> 24)
248 | ((x >> 8) & 0x0000ff00)
249 | ((x << 8) & 0x00ff0000)
250 | (x << 24);
251 }
252
253 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
254 ecb_function_ uint64_t
255 ecb_bswap64 (uint64_t x)
256 {
257 return (((uint64_t)ecb_bswap32 (x)) << 32)
258 | ecb_bswap32 (x >> 32);
259 }
260#endif
261
262#if ECB_GCC_VERSION(4,5)
263 #define ecb_unreachable() __builtin_unreachable ()
264#else
265 /* this seems to work fine, but gcc always emits a warning for it :/ */
266 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
267 ecb_function_ void ecb_unreachable (void) { }
268#endif
269
106/* try to tell the compiler that some condition is definitely true */ 270/* try to tell the compiler that some condition is definitely true */
107#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 271#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
108 272
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; 273ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
177ECB_HEADER_INLINE unsigned char 274ecb_function_ unsigned char
178ecb_byteorder_helper (void) 275ecb_byteorder_helper (void)
179{ 276{
180 const uint32_t u = 0x11223344; 277 const uint32_t u = 0x11223344;
181 return *(unsigned char *)&u; 278 return *(unsigned char *)&u;
182} 279}
183 280
184ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 281ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
185ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 282ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
186ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 283ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
187ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 284ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
188 285
189#if ECB_GCC_VERSION(3,0) 286#if ECB_GCC_VERSION(3,0) || ECB_C99
190# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 287 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191#else 288#else
192# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 289 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
193#endif 290#endif
194 291
195#if ecb_cplusplus_does_not_suck 292#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) 293 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
197template<typename T, int N> 294 template<typename T, int N>
198static inline int ecb_array_length (const T (&arr)[N]) 295 static inline int ecb_array_length (const T (&arr)[N])
199{ 296 {
200 return N; 297 return N;
201} 298 }
202#else 299#else
203#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 300 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
204#endif 301#endif
205 302
206ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 303ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
207ECB_INLINE uint32_t 304ecb_inline uint32_t
208ecb_rotr32 (uint32_t x, unsigned int count) 305ecb_rotr32 (uint32_t x, unsigned int count)
209{ 306{
210 return (x << (32 - count)) | (x >> count); 307 return (x << (32 - count)) | (x >> count);
211} 308}
212 309
213ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; 310ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
214ECB_INLINE uint32_t 311ecb_inline uint32_t
215ecb_rotl32 (uint32_t x, unsigned int count) 312ecb_rotl32 (uint32_t x, unsigned int count)
216{ 313{
217 return (x >> (32 - count)) | (x << count); 314 return (x >> (32 - count)) | (x << count);
218} 315}
219 316
220#endif 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}
221 323
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
332

Diff Legend

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