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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 1.37 by root, Sat Jun 11 13:47:47 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 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * 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-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
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__)
43# define ECB_GCC_VERSION(major,minor) 0 44 #define ECB_GCC_VERSION(major,minor) 0
44# else 45 #else
45# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 46 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
46# endif 47 #endif
47#endif 48#endif
48 49
49#ifndef __cplusplus 50#ifndef __cplusplus
50# if __STDC_VERSION__ >= 199901L 51 #if __STDC_VERSION__ >= 199901L
51# define ECB_INLINE inline 52 #define ECB_INLINE static inline
52typedef _Bool ecb_bool; 53 typedef _Bool ecb_bool;
53# else 54 #else
54# define ECB_INLINE inline /* yeah! */ 55 #define ECB_INLINE static inline /* we assume the extension is ubiquituous, please tell us when we are wrong, or upgrade to the GCC */
55typedef int ecb_bool; 56 typedef int ecb_bool;
56# endif 57 #endif
58#else
59 #define ECB_INLINE static inline
60 typedef bool ecb_bool;
57#endif 61#endif
58 62
59#define ECB_CONCAT_(a, b) a ## b 63#define ECB_CONCAT_(a, b) a ## b
60#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
61#define ECB_STRINGIFY_(a) # a 65#define ECB_STRINGIFY_(a) # a
62#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
63 67
64#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE ECB_INLINE
65 69
66#if ECB_GCC_VERSION(3,1) 70#if ECB_GCC_VERSION(3,1)
67# define ecb_attribute(attrlist) __attribute__(attrlist) 71 #define ecb_attribute(attrlist) __attribute__(attrlist)
68# define ecb_is_constant(c) __builtin_constant_p (c) 72 #define ecb_is_constant(expr) __builtin_constant_p (expr)
69# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 73 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
70# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 74 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
71#else 75#else
72# define ecb_attribute(attrlist) 76 #define ecb_attribute(attrlist)
73# define ecb_is_constant(c) 0 77 #define ecb_is_constant(expr) 0
74# define ecb_expect(expr,value) (expr) 78 #define ecb_expect(expr,value) (expr)
75# define ecb_prefetch(addr,rw,locality) 79 #define ecb_prefetch(addr,rw,locality)
76#endif 80#endif
77 81
78/* no emulation for ecb_decltype */ 82/* no emulation for ecb_decltype */
79#if ECB_GCC_VERSION(4,5) 83#if ECB_GCC_VERSION(4,5)
80# define ecb_decltype(x) __decltype(x) 84 #define ecb_decltype(x) __decltype(x)
81#elif ECB_GCC_VERSION(3,0) 85#elif ECB_GCC_VERSION(3,0)
82# define ecb_decltype(x) typeof(x) 86 #define ecb_decltype(x) typeof(x)
83#endif 87#endif
84 88
85#define ecb_noinline ecb_attribute ((noinline)) 89#define ecb_noinline ecb_attribute ((__noinline__))
86#define ecb_noreturn ecb_attribute ((noreturn)) 90#define ecb_noreturn ecb_attribute ((__noreturn__))
87#define ecb_unused ecb_attribute ((unused)) 91#define ecb_unused ecb_attribute ((__unused__))
88#define ecb_const ecb_attribute ((const)) 92#define ecb_const ecb_attribute ((__const__))
89#define ecb_pure ecb_attribute ((pure)) 93#define ecb_pure ecb_attribute ((__pure__))
94
95#if ECB_GCC_VERSION(4,3)
96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
91#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
99#else
100 #define ecb_artificial
101 #define ecb_hot
102 #define ecb_cold
103#endif
92 104
93/* put into ifs if you are very sure that the expression */ 105/* put into if's if you are very sure that the expression */
94/* is mostly true or mosty false. note that these return */ 106/* is mostly true or mostly false. note that these return */
95/* booleans, not the expression. */ 107/* booleans, not the expression. */
96#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 108#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
109#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
110/* for compatibility to the rest of the world */
97#define ecb_likely(expr) ecb_expect (!!(expr), 1) 111#define ecb_likely(expr) ecb_expect_true (expr)
112#define ecb_unlikely(expr) ecb_expect_false (expr)
98 113
99/* try to tell the compiler that some condition is definitely true */ 114/* try to tell the compiler that some condition is definitely true */
100#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 115#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
101 116
102/* count trailing zero bits and count # of one bits */ 117/* 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) 118#if ECB_GCC_VERSION(3,4)
106ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 119 #define ecb_ctz32(x) __builtin_ctz (x)
107ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 120 #define ecb_popcount32(x) __builtin_popcount (x)
108#else 121#else
122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
109ECB_HEADER_INLINE 123 ECB_HEADER_INLINE int
110ecb_ctz32 (uint32_t x) 124 ecb_ctz32 (uint32_t x)
111{ 125 {
112 int r = 0; 126 int r = 0;
113 127
114 x &= -x; /* this isolates the lowest bit */ 128 x &= -x; /* this isolates the lowest bit */
115 129
116 if (x & 0xaaaaaaaa) r += 1; 130 if (x & 0xaaaaaaaa) r += 1;
117 if (x & 0xcccccccc) r += 2; 131 if (x & 0xcccccccc) r += 2;
118 if (x & 0xf0f0f0f0) r += 4; 132 if (x & 0xf0f0f0f0) r += 4;
119 if (x & 0xff00ff00) r += 8; 133 if (x & 0xff00ff00) r += 8;
120 if (x & 0xffff0000) r += 16; 134 if (x & 0xffff0000) r += 16;
121 135
122 return r; 136 return r;
123} 137 }
124 138
139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
125ECB_HEADER_INLINE 140 ECB_HEADER_INLINE int
126ecb_popcount32 (uint32_t x) 141 ecb_popcount32 (uint32_t x)
127{ 142 {
128 x -= (x >> 1) & 0x55555555; 143 x -= (x >> 1) & 0x55555555;
129 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
130 x = ((x >> 4) + x) & 0x0f0f0f0f; 145 x = ((x >> 4) + x) & 0x0f0f0f0f;
131 x *= 0x01010101; 146 x *= 0x01010101;
132 147
133 return x >> 24; 148 return x >> 24;
134} 149 }
135#endif 150#endif
136 151
137ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
138#if ECB_GCC_VERSION(4,3) 152#if ECB_GCC_VERSION(4,3)
139ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); } 153 #define ecb_bswap32(x) __builtin_bswap32 (x)
154 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
140#else 155#else
156 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
141ECB_HEADER_INLINE uint32_t 157 ECB_HEADER_INLINE uint32_t
142ecb_bswap32 (uint32_t x) 158 ecb_bswap32 (uint32_t x)
143{ 159 {
144 return (x >> 24) 160 return (x >> 24)
145 | ((x >> 8) & 0x0000ff00) 161 | ((x >> 8) & 0x0000ff00)
146 | ((x << 8) & 0x00ff0000) 162 | ((x << 8) & 0x00ff0000)
147 | (x << 24); 163 | (x << 24);
148} 164 }
149#endif
150 165
151ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn)); 166 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
167 ECB_HEADER_INLINE uint32_t
168 ecb_bswap16 (uint32_t x)
169 {
170 return ((x >> 8) & 0xff)
171 | ((x << 8) & 0x00ff0000)
172 | (x << 24);
173 }
174#endif
175
152#if ECB_GCC_VERSION(4,5) 176#if ECB_GCC_VERSION(4,5)
153ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); } 177 #define ecb_unreachable() __builtin_unreachable ()
154#else 178#else
155/* this seems to work fine, but gcc always emits a warning for it :/ */ 179 /* this seems to work fine, but gcc always emits a warning for it :/ */
180 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
156ECB_HEADER_INLINE void ecb_unreachable (void) { } 181 ECB_HEADER_INLINE void ecb_unreachable (void) { }
157#endif 182#endif
158 183
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; 184ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
160
161ECB_HEADER_INLINE unsigned char 185ECB_HEADER_INLINE unsigned char
162ecb_byteorder_helper () 186ecb_byteorder_helper (void)
163{ 187{
164 const uint32_t u = 0x11223344; 188 const uint32_t u = 0x11223344;
165 return *(unsigned char *)&u; 189 return *(unsigned char *)&u;
166} 190}
167 191
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
169ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; 193ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
171ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; 195ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
196
197#if ECB_GCC_VERSION(3,0)
198 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
199#else
200 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
201#endif
172 202
173#if ecb_cplusplus_does_not_suck 203#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) 204 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
175template<typename T, int N> 205 template<typename T, int N>
176static inline int ecb_array_length (const T (&arr)[N]) 206 static inline int ecb_array_length (const T (&arr)[N])
177{ 207 {
178 return N; 208 return N;
179} 209 }
180#else 210#else
181#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
182#endif 212#endif
183 213
184ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 214ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
185ECB_INLINE uint32_t 215ECB_INLINE uint32_t
186ecb_rotr32 (uint32_t x, unsigned int count) 216ecb_rotr32 (uint32_t x, unsigned int count)

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