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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 1.16 by root, Thu May 26 18:34:23 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)
… …
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 */
109#if ECB_GCC_VERSION(3,4) 103#if ECB_GCC_VERSION(3,4)
110ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 104#define ecb_ctz32 (x) __builtin_ctz (x)
111ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 105#define ecb_popcount32 (x) __builtin_popcount (x)
112#else 106#else
107ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
113ECB_HEADER_INLINE 108ECB_HEADER_INLINE
114ecb_ctz32 (uint32_t x) ecb_const 109ecb_ctz32 (uint32_t x)
115{ 110{
116 int r = 0; 111 int r = 0;
117 112
118 x &= -x; /* this isolates the lowest bit */ 113 x &= -x; /* this isolates the lowest bit */
119 114
… …
124 if (x & 0xffff0000) r += 16; 119 if (x & 0xffff0000) r += 16;
125 120
126 return r; 121 return r;
127} 122}
128 123
124ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
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
137#if ECB_GCC_VERSION(4,3)
138# define ecb_bswap32(x) __builtin_bswap32 (x)
139#else
140ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
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
151#if ECB_GCC_VERSION(4,5)
152# define ecb_unreachable() __builtin_unreachable ()
153#else
154/* this seems to work fine, but gcc always emits a warning for it :/ */
155ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn));
156ECB_HEADER_INLINE void ecb_unreachable (void) { }
157#endif
158
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const;
141ECB_HEADER_INLINE unsigned char 160ECB_HEADER_INLINE unsigned char
142ecb_byteorder_helper () ecb_const 161ecb_byteorder_helper ()
143{ 162{
144 const uint32_t u = 0x11223344; 163 const uint32_t u = 0x11223344;
145 return *(unsigned char *)&u; 164 return *(unsigned char *)&u;
146} 165}
147 166
167ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const;
148ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 168ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; };
169ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const;
149ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 170ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; };
150 171
151#if ecb_cplusplus_does_not_suck 172#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) 173// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
153template<typename T, int N> 174template<typename T, int N>
154static inline int ecb_array_length (const T (&arr)[N]) 175static inline int ecb_array_length (const T (&arr)[N])
… …
157} 178}
158#else 179#else
159#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 180#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
160#endif 181#endif
161 182
183ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
162ECB_INLINE uint32_t 184ECB_INLINE uint32_t
163ecb_rotr32 (uint32_t x, unsigned int count) 185ecb_rotr32 (uint32_t x, unsigned int count)
164{ 186{
165 return (x << (32 - count)) | (x >> count); 187 return (x << (32 - count)) | (x >> count);
166} 188}
167 189
190ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
168ECB_INLINE uint32_t 191ECB_INLINE uint32_t
169ecb_rotl32 (uint32_t x, unsigned int count) 192ecb_rotl32 (uint32_t x, unsigned int count)
170{ 193{
171 return (x >> (32 - count)) | (x << count); 194 return (x >> (32 - count)) | (x << count);
172} 195}
173 196
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 197#endif
186 198
187#endif
188

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