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Comparing libecb/ecb.h (file contents):
Revision 1.14 by root, Thu May 26 18:26:59 2011 UTC vs.
Revision 1.27 by sf-exg, Thu May 26 21:36:49 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
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
… …
32 32
33#include <inttypes.h> 33#include <inttypes.h>
34 34
35/* many compilers define _GNUC_ to some versions but then only implement 35/* many compilers define _GNUC_ to some versions but then only implement
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 in return for some better fake benchmark numbers.
38 * or so.
38 * we try to detect these and simply assume they are not gcc - if they have 39 * 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. 40 * an issue with that they should have done it right in the first place.
40 */ 41 */
41#ifndef ECB_GCC_VERSION 42#ifndef ECB_GCC_VERSION
42# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 43# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
… …
63 64
64#define ECB_HEADER_INLINE static ECB_INLINE 65#define ECB_HEADER_INLINE static ECB_INLINE
65 66
66#if ECB_GCC_VERSION(3,1) 67#if ECB_GCC_VERSION(3,1)
67# define ecb_attribute(attrlist) __attribute__(attrlist) 68# define ecb_attribute(attrlist) __attribute__(attrlist)
68# define ecb_is_constant(c) __builtin_constant_p (c) 69# define ecb_is_constant(expr) __builtin_constant_p (expr)
69# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 70# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
70# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 71# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
71#else 72#else
72# define ecb_attribute(attrlist) 73# define ecb_attribute(attrlist)
73# define ecb_is_constant(c) 0 74# define ecb_is_constant(expr) 0
74# define ecb_expect(expr,value) (expr) 75# define ecb_expect(expr,value) (expr)
75# define ecb_prefetch(addr,rw,locality) 76# define ecb_prefetch(addr,rw,locality)
76#endif 77#endif
77 78
78/* no emulation for ecb_decltype */ 79/* no emulation for ecb_decltype */
… …
80# define ecb_decltype(x) __decltype(x) 81# define ecb_decltype(x) __decltype(x)
81#elif ECB_GCC_VERSION(3,0) 82#elif ECB_GCC_VERSION(3,0)
82# define ecb_decltype(x) typeof(x) 83# define ecb_decltype(x) typeof(x)
83#endif 84#endif
84 85
86#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
85#define ecb_noinline ecb_attribute ((noinline)) 87#define ecb_noinline ecb_attribute ((__noinline__))
86#define ecb_noreturn ecb_attribute ((noreturn)) 88#define ecb_noreturn ecb_attribute ((__noreturn__))
87#define ecb_unused ecb_attribute ((unused)) 89#define ecb_unused ecb_attribute ((__unused__))
88#define ecb_const ecb_attribute ((const)) 90#define ecb_const ecb_attribute ((__const__))
89#define ecb_pure ecb_attribute ((pure)) 91#define ecb_pure ecb_attribute ((__pure__))
90#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 92#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
91#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 93#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
92 94
93/* put into ifs if you are very sure that the expression */ 95/* put into if's if you are very sure that the expression */
94/* is mostly true or mosty false. note that these return */ 96/* is mostly true or mosty false. note that these return */
95/* booleans, not the expression. */ 97/* booleans, not the expression. */
96#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 98#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
97#define ecb_likely(expr) ecb_expect (!!(expr), 1) 99#define ecb_likely(expr) ecb_expect (!!(expr), 1)
98 100
99/* try to tell the compiler that some condition is definitely true */ 101/* try to tell the compiler that some condition is definitely true */
100#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 102#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
101 103
102/* count trailing zero bits and count # of one bits */ 104/* 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;
105#if ECB_GCC_VERSION(3,4) 105#if ECB_GCC_VERSION(3,4)
106ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 106#define ecb_ctz32(x) __builtin_ctz (x)
107ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 107#define ecb_popcount32(x) __builtin_popcount (x)
108#else 108#else
109ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
109ECB_HEADER_INLINE 110ECB_HEADER_INLINE
110ecb_ctz32 (uint32_t x) 111ecb_ctz32 (uint32_t x)
111{ 112{
112 int r = 0; 113 int r = 0;
113 114
… …
120 if (x & 0xffff0000) r += 16; 121 if (x & 0xffff0000) r += 16;
121 122
122 return r; 123 return r;
123} 124}
124 125
126ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
125ECB_HEADER_INLINE 127ECB_HEADER_INLINE
126ecb_popcount32 (uint32_t x) 128ecb_popcount32 (uint32_t x)
127{ 129{
128 x -= (x >> 1) & 0x55555555; 130 x -= (x >> 1) & 0x55555555;
129 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 131 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
… …
132 134
133 return x >> 24; 135 return x >> 24;
134} 136}
135#endif 137#endif
136 138
139#if ECB_GCC_VERSION(4,3)
140# define ecb_bswap32(x) __builtin_bswap32 (x)
141# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
142#else
137ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 143ECB_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 144ECB_HEADER_INLINE uint32_t
142ecb_bswap32 (uint32_t x) 145ecb_bswap32 (uint32_t x)
143{ 146{
144 return (x >> 24) 147 return (x >> 24)
145 | ((x >> 8) & 0x0000ff00) 148 | ((x >> 8) & 0x0000ff00)
146 | ((x << 8) & 0x00ff0000) 149 | ((x << 8) & 0x00ff0000)
147 | (x << 24); 150 | (x << 24);
148} 151}
149#endif
150 152
151ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn)); 153ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
154ECB_HEADER_INLINE uint32_t
155ecb_bswap16 (uint32_t x)
156{
157 return ((x >> 8) & 0xff)
158 | ((x << 8) & 0x00ff0000)
159 | (x << 24);
160}
161#endif
162
152#if ECB_GCC_VERSION(4,5) 163#if ECB_GCC_VERSION(4,5)
153ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); } 164# define ecb_unreachable() __builtin_unreachable ()
154#else 165#else
155/* this seems to work fine, but gcc always emits a warning for it :/ */ 166/* this seems to work fine, but gcc always emits a warning for it :/ */
167ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
156ECB_HEADER_INLINE void ecb_unreachable (void) { } 168ECB_HEADER_INLINE void ecb_unreachable (void) { }
157#endif 169#endif
158 170
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; 171ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
160
161ECB_HEADER_INLINE unsigned char 172ECB_HEADER_INLINE unsigned char
162ecb_byteorder_helper () 173ecb_byteorder_helper (void)
163{ 174{
164 const uint32_t u = 0x11223344; 175 const uint32_t u = 0x11223344;
165 return *(unsigned char *)&u; 176 return *(unsigned char *)&u;
166} 177}
167 178
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 179ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
169ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; 180ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 181ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
171ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; 182ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
183
184#define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n)))
172 185
173#if ecb_cplusplus_does_not_suck 186#if ecb_cplusplus_does_not_suck
174// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 187// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
175template<typename T, int N> 188template<typename T, int N>
176static inline int ecb_array_length (const T (&arr)[N]) 189static inline int ecb_array_length (const T (&arr)[N])

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