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Comparing libecb/ecb.h (file contents):
Revision 1.6 by root, Thu May 26 17:35:47 2011 UTC vs.
Revision 1.49 by root, Fri Jun 17 18:46:19 2011 UTC

1/* 1/*
2 * libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann 4 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
5 * All rights reserved. 6 * All rights reserved.
6 * 7 *
7 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
9 * 10 *
… …
27 */ 28 */
28 29
29#ifndef ECB_H 30#ifndef ECB_H
30#define ECB_H 31#define ECB_H
31 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
32#include <inttypes.h> 48 #include <inttypes.h>
49#endif
33 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
34#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
64#endif
35 65
66#define ECB_C99 (__STDC_VERSION__ >= 199901L)
67
36#ifndef __cplusplus 68#if __cplusplus
37# if __STDC_VERSION__ >= 199901L 69 #define ecb_inline static inline
38# define ECB_INLINE inline 70#elif ECB_GCC_VERSION(2,5)
39typedef _Bool ecb_bool; 71 #define ecb_inline static __inline__
72#elif ECB_C99
73 #define ecb_inline static inline
40# else 74#else
41# define ECB_INLINE 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
42typedef int ecb_bool; 86typedef int ecb_bool;
43# endif
44#endif
45 87
46#define ECB_HEADER_INLINE static ECB_INLINE 88#define ECB_CONCAT_(a, b) a ## b
89#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
90#define ECB_STRINGIFY_(a) # a
91#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
92
93#define ecb_function_ ecb_inline
47 94
48#if ECB_GCC_VERSION(3,1) 95#if ECB_GCC_VERSION(3,1)
49# define ecb_attribute(attrlist) __attribute__(attrlist) 96 #define ecb_attribute(attrlist) __attribute__(attrlist)
50# define ecb_is_constant(c) __builtin_constant_p (c) 97 #define ecb_is_constant(expr) __builtin_constant_p (expr)
51# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 98 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
52# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 99 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
53#else 100#else
54# define ecb_attribute(attrlist) 101 #define ecb_attribute(attrlist)
55# define ecb_is_constant(c) 0 102 #define ecb_is_constant(expr) 0
56# define ecb_expect(expr,value) (expr) 103 #define ecb_expect(expr,value) (expr)
57# define ecb_prefetch(addr,rw,locality) 104 #define ecb_prefetch(addr,rw,locality)
58#endif 105#endif
59 106
60/* no emulation for ecb_decltype */ 107/* no emulation for ecb_decltype */
61#if ECB_GCC_VERSION(4,5) 108#if ECB_GCC_VERSION(4,5)
62# define ecb_decltype(x) __decltype(x) 109 #define ecb_decltype(x) __decltype(x)
63#elif ECB_GCC_VERSION(3,0) 110#elif ECB_GCC_VERSION(3,0)
64# define ecb_decltype(x) typeof(x) 111 #define ecb_decltype(x) __typeof(x)
65#endif 112#endif
66 113
67#define ecb_noinline ecb_attribute ((noinline)) 114#define ecb_noinline ecb_attribute ((__noinline__))
68#define ecb_noreturn ecb_attribute ((noreturn)) 115#define ecb_noreturn ecb_attribute ((__noreturn__))
69#define ecb_unused ecb_attribute ((unused)) 116#define ecb_unused ecb_attribute ((__unused__))
70#define ecb_const ecb_attribute ((const)) 117#define ecb_const ecb_attribute ((__const__))
71#define ecb_pure ecb_attribute ((pure)) 118#define ecb_pure ecb_attribute ((__pure__))
72#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
73#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
74 119
75#if ECB_GCC_VERSION(4,5) 120#if ECB_GCC_VERSION(4,3)
76# define ecb_unreachable() __builtin_unreachable () 121 #define ecb_artificial ecb_attribute ((__artificial__))
122 #define ecb_hot ecb_attribute ((__hot__))
123 #define ecb_cold ecb_attribute ((__cold__))
77#else 124#else
78/* this seems to work fine, but gcc always emits a warning for it :/ */ 125 #define ecb_artificial
79ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 126 #define ecb_hot
80ECB_HEADER_INLINE void ecb_unreachable () { } 127 #define ecb_cold
81#endif 128#endif
82 129
83/* put into ifs if you are very sure that the expression */ 130/* put around conditional expressions if you are very sure that the */
84/* is mostly true or mosty false. note that these return */ 131/* expression is mostly true or mostly false. note that these return */
85/* booleans, not the expression. */ 132/* booleans, not the expression. */
86#define ecb_unlikely(expr) ecb_expect ((expr) ? 1 : 0, 0) 133#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
134#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
135/* for compatibility to the rest of the world */
87#define ecb_likely(expr) ecb_expect ((expr) ? 1 : 0, 1) 136#define ecb_likely(expr) ecb_expect_true (expr)
88 137#define ecb_unlikely(expr) ecb_expect_false (expr)
89/* try to tell the compiler that some condition is definitely true */
90#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0)
91 138
92/* count trailing zero bits and count # of one bits */ 139/* count trailing zero bits and count # of one bits */
93#if ECB_GCC_VERSION(3,4) 140#if ECB_GCC_VERSION(3,4)
94ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 141 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
95ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 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 */
96#else 148#else
97ECB_HEADER_INLINE 149 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
150 ecb_function_ int
98ecb_ctz32 (uint32_t x) ecb_const 151 ecb_ctz32 (uint32_t x)
99{ 152 {
100 int r = 0; 153 int r = 0;
101 154
102 x &= -x; /* this isolates the lowest bit */ 155 x &= ~x + 1; /* this isolates the lowest bit */
103 156
104 if (x & 0xaaaaaaaa) r += 1; 157 if (x & 0xaaaaaaaa) r += 1;
105 if (x & 0xcccccccc) r += 2; 158 if (x & 0xcccccccc) r += 2;
106 if (x & 0xf0f0f0f0) r += 4; 159 if (x & 0xf0f0f0f0) r += 4;
107 if (x & 0xff00ff00) r += 8; 160 if (x & 0xff00ff00) r += 8;
108 if (x & 0xffff0000) r += 16; 161 if (x & 0xffff0000) r += 16;
109 162
110 return r; 163 return r;
111} 164 }
112 165
113ECB_HEADER_INLINE 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
114ecb_popcount32 (uint32_t x) ecb_const 176 ecb_popcount32 (uint32_t x)
115{ 177 {
116 x -= (x >> 1) & 0x55555555; 178 x -= (x >> 1) & 0x55555555;
117 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 179 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
118 x = ((x >> 4) + x) & 0x0f0f0f0f; 180 x = ((x >> 4) + x) & 0x0f0f0f0f;
119 x *= 0x01010101; 181 x *= 0x01010101;
120 182
121 return x >> 24; 183 return x >> 24;
122} 184 }
123#endif
124 185
125ECB_HEADER_INLINE unsigned char 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
270/* try to tell the compiler that some condition is definitely true */
271#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
272
273ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
274ecb_function_ unsigned char
126ecb_byteorder_helper () ecb_const 275ecb_byteorder_helper (void)
127{ 276{
128 const uint32_t u = 0x11223344; 277 const uint32_t u = 0x11223344;
129 return *(unsigned char *)&u; 278 return *(unsigned char *)&u;
130} 279}
131 280
281ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
132ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 282ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
283ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
133ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 284ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
285
286#if ECB_GCC_VERSION(3,0) || ECB_C99
287 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
288#else
289 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
290#endif
134 291
135#if ecb_cplusplus_does_not_suck 292#if ecb_cplusplus_does_not_suck
136// 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) */
137template<typename T, int N> 294 template<typename T, int N>
138static inline int array_length (const T (&arr)[N]) 295 static inline int ecb_array_length (const T (&arr)[N])
139{ 296 {
140 return N; 297 return N;
141} 298 }
142#else 299#else
143#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 300 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
144#endif 301#endif
145 302
146ECB_INLINE uint32_t 303ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
304ecb_inline uint32_t
147ecb_rotate32_right (uint32_t c, unsigned int count = 1) 305ecb_rotr32 (uint32_t x, unsigned int count)
148{ 306{
149 return (c << (32 - count)) | (c >> count); 307 return (x << (32 - count)) | (x >> count);
150} 308}
151 309
152ECB_INLINE uint32_t 310ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
311ecb_inline uint32_t
153ecb_rotate32_left (uint32_t c, unsigned int count = 1) 312ecb_rotl32 (uint32_t x, unsigned int count)
154{ 313{
155 return (c >> (32 - count)) | (c << count); 314 return (x >> (32 - count)) | (x << count);
156} 315}
157 316
158#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}
159 323
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

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