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Comparing libecb/ecb.h (file contents):
Revision 1.12 by root, Thu May 26 18:17:45 2011 UTC vs.
Revision 1.14 by root, Thu May 26 18:26:59 2011 UTC

… …
36 * what their idiot authors think are the "more important" extensions, 36 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief for some better fake benchmark numbers or so. 37 * causing enourmous grief for some better fake benchmark numbers or so.
38 * we try to detect these and simply assume they are not gcc - if they have 38 * we try to detect these and simply assume they are not gcc - if they have
39 * an issue with that they should have done it right in the first place. 39 * an issue with that they should have done it right in the first place.
40 */ 40 */
41#ifndef ECB_GCC_VERSION
41#if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 42# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
42# define ECB_GCC_VERSION(major,minor) 0 43# define ECB_GCC_VERSION(major,minor) 0
43#else 44# else
44# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 45# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
46# endif
45#endif 47#endif
46 48
47#ifndef __cplusplus 49#ifndef __cplusplus
48# if __STDC_VERSION__ >= 199901L 50# if __STDC_VERSION__ >= 199901L
49# define ECB_INLINE inline 51# define ECB_INLINE inline
… …
86#define ecb_const ecb_attribute ((const)) 88#define ecb_const ecb_attribute ((const))
87#define ecb_pure ecb_attribute ((pure)) 89#define ecb_pure ecb_attribute ((pure))
88#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 90#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
89#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 91#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
90 92
91#if ECB_GCC_VERSION(4,5)
92# define ecb_unreachable() __builtin_unreachable ()
93#else
94/* this seems to work fine, but gcc always emits a warning for it :/ */
95ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn));
96ECB_HEADER_INLINE void ecb_unreachable () { }
97#endif
98
99/* put into ifs if you are very sure that the expression */ 93/* put into ifs if you are very sure that the expression */
100/* is mostly true or mosty false. note that these return */ 94/* is mostly true or mosty false. note that these return */
101/* booleans, not the expression. */ 95/* booleans, not the expression. */
102#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 96#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
103#define ecb_likely(expr) ecb_expect (!!(expr), 1) 97#define ecb_likely(expr) ecb_expect (!!(expr), 1)
104 98
105/* try to tell the compiler that some condition is definitely true */ 99/* try to tell the compiler that some condition is definitely true */
106#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 100#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0)
107 101
108/* count trailing zero bits and count # of one bits */ 102/* count trailing zero bits and count # of one bits */
103ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
104ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
109#if ECB_GCC_VERSION(3,4) 105#if ECB_GCC_VERSION(3,4)
110ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 106ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); }
111ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 107ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); }
112#else 108#else
113ECB_HEADER_INLINE 109ECB_HEADER_INLINE
114ecb_ctz32 (uint32_t x) ecb_const 110ecb_ctz32 (uint32_t x)
115{ 111{
116 int r = 0; 112 int r = 0;
117 113
118 x &= -x; /* this isolates the lowest bit */ 114 x &= -x; /* this isolates the lowest bit */
119 115
… …
125 121
126 return r; 122 return r;
127} 123}
128 124
129ECB_HEADER_INLINE 125ECB_HEADER_INLINE
130ecb_popcount32 (uint32_t x) ecb_const 126ecb_popcount32 (uint32_t x)
131{ 127{
132 x -= (x >> 1) & 0x55555555; 128 x -= (x >> 1) & 0x55555555;
133 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 129 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
134 x = ((x >> 4) + x) & 0x0f0f0f0f; 130 x = ((x >> 4) + x) & 0x0f0f0f0f;
135 x *= 0x01010101; 131 x *= 0x01010101;
136 132
137 return x >> 24; 133 return x >> 24;
138} 134}
139#endif 135#endif
140 136
137ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
138#if ECB_GCC_VERSION(4,3)
139ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); }
140#else
141ECB_HEADER_INLINE uint32_t
142ecb_bswap32 (uint32_t x)
143{
144 return (x >> 24)
145 | ((x >> 8) & 0x0000ff00)
146 | ((x << 8) & 0x00ff0000)
147 | (x << 24);
148}
149#endif
150
151ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn));
152#if ECB_GCC_VERSION(4,5)
153ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); }
154#else
155/* this seems to work fine, but gcc always emits a warning for it :/ */
156ECB_HEADER_INLINE void ecb_unreachable (void) { }
157#endif
158
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const;
160
141ECB_HEADER_INLINE unsigned char 161ECB_HEADER_INLINE unsigned char
142ecb_byteorder_helper () ecb_const 162ecb_byteorder_helper ()
143{ 163{
144 const uint32_t u = 0x11223344; 164 const uint32_t u = 0x11223344;
145 return *(unsigned char *)&u; 165 return *(unsigned char *)&u;
146} 166}
147 167
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const;
148ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 169ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; };
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const;
149ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 171ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; };
150 172
151#if ecb_cplusplus_does_not_suck 173#if ecb_cplusplus_does_not_suck
152// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 174// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
153template<typename T, int N> 175template<typename T, int N>
154static inline int ecb_array_length (const T (&arr)[N]) 176static inline int ecb_array_length (const T (&arr)[N])
… …
157} 179}
158#else 180#else
159#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 181#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
160#endif 182#endif
161 183
184ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
162ECB_INLINE uint32_t 185ECB_INLINE uint32_t
163ecb_rotr32 (uint32_t x, unsigned int count) 186ecb_rotr32 (uint32_t x, unsigned int count)
164{ 187{
165 return (x << (32 - count)) | (x >> count); 188 return (x << (32 - count)) | (x >> count);
166} 189}
167 190
191ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
168ECB_INLINE uint32_t 192ECB_INLINE uint32_t
169ecb_rotl32 (uint32_t x, unsigned int count) 193ecb_rotl32 (uint32_t x, unsigned int count)
170{ 194{
171 return (x >> (32 - count)) | (x << count); 195 return (x >> (32 - count)) | (x << count);
172} 196}
173 197
174#if ECB_GCC_VERSION(4,3)
175ECB_GCC_VERSION uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); }
176#else
177ECB_GCC_VERSION uint32_t
178ecb_bswap32 (uint32_t x)
179{
180 return (x >> 24)
181 | ((x >> 8) & 0x0000ff00)
182 | ((x << 8) & 0x00ff0000)
183 | (x << 24);
184}
185#endif 198#endif
186 199
187#endif
188

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