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Comparing libecb/ecb.h (file contents):
Revision 1.10 by root, Thu May 26 17:57:32 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:
… …
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33#include <inttypes.h> 33#include <inttypes.h>
34 34
35/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers.
38 * or so.
39 * we try to detect these and simply assume they are not gcc - if they have
40 * an issue with that they should have done it right in the first place.
41 */
42#ifndef ECB_GCC_VERSION
43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
44 #define ECB_GCC_VERSION(major,minor) 0
45 #else
35#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)))
47 #endif
48#endif
36 49
37#ifndef __cplusplus 50#ifndef __cplusplus
38# if __STDC_VERSION__ >= 199901L 51 #if __STDC_VERSION__ >= 199901L
39# define ECB_INLINE inline 52 #define ECB_INLINE static inline
40typedef _Bool ecb_bool; 53 typedef _Bool ecb_bool;
41# else 54 #else
42# 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 */
43typedef int ecb_bool; 56 typedef int ecb_bool;
44# endif 57 #endif
58#else
59 #define ECB_INLINE static inline
60 typedef bool ecb_bool;
45#endif 61#endif
46 62
47#define ECB_CONCAT_(a, b) a ## b 63#define ECB_CONCAT_(a, b) a ## b
48#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
49#define ECB_STRINGIFY_(a) # a 65#define ECB_STRINGIFY_(a) # a
50#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
51 67
52#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE ECB_INLINE
53 69
54#if ECB_GCC_VERSION(3,1) 70#if ECB_GCC_VERSION(3,1)
55# define ecb_attribute(attrlist) __attribute__(attrlist) 71 #define ecb_attribute(attrlist) __attribute__(attrlist)
56# define ecb_is_constant(c) __builtin_constant_p (c) 72 #define ecb_is_constant(expr) __builtin_constant_p (expr)
57# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 73 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
58# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 74 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
59#else 75#else
60# define ecb_attribute(attrlist) 76 #define ecb_attribute(attrlist)
61# define ecb_is_constant(c) 0 77 #define ecb_is_constant(expr) 0
62# define ecb_expect(expr,value) (expr) 78 #define ecb_expect(expr,value) (expr)
63# define ecb_prefetch(addr,rw,locality) 79 #define ecb_prefetch(addr,rw,locality)
64#endif 80#endif
65 81
66/* no emulation for ecb_decltype */ 82/* no emulation for ecb_decltype */
67#if ECB_GCC_VERSION(4,5) 83#if ECB_GCC_VERSION(4,5)
68# define ecb_decltype(x) __decltype(x) 84 #define ecb_decltype(x) __decltype(x)
69#elif ECB_GCC_VERSION(3,0) 85#elif ECB_GCC_VERSION(3,0)
70# define ecb_decltype(x) typeof(x) 86 #define ecb_decltype(x) typeof(x)
71#endif 87#endif
72 88
73#define ecb_noinline ecb_attribute ((noinline)) 89#define ecb_noinline ecb_attribute ((__noinline__))
74#define ecb_noreturn ecb_attribute ((noreturn)) 90#define ecb_noreturn ecb_attribute ((__noreturn__))
75#define ecb_unused ecb_attribute ((unused)) 91#define ecb_unused ecb_attribute ((__unused__))
76#define ecb_const ecb_attribute ((const)) 92#define ecb_const ecb_attribute ((__const__))
77#define ecb_pure ecb_attribute ((pure)) 93#define ecb_pure ecb_attribute ((__pure__))
78#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
79#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
80 94
81#if ECB_GCC_VERSION(4,5) 95#if ECB_GCC_VERSION(4,3)
82# define ecb_unreachable() __builtin_unreachable () 96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
83#else 99#else
84/* this seems to work fine, but gcc always emits a warning for it :/ */ 100 #define ecb_artificial
85ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 101 #define ecb_hot
86ECB_HEADER_INLINE void ecb_unreachable () { } 102 #define ecb_cold
87#endif 103#endif
88 104
89/* put into ifs if you are very sure that the expression */ 105/* put into if's if you are very sure that the expression */
90/* is mostly true or mosty false. note that these return */ 106/* is mostly true or mostly false. note that these return */
91/* booleans, not the expression. */ 107/* booleans, not the expression. */
92#define ecb_unlikely(expr) ecb_expect ((expr) ? 1 : 0, 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 */
93#define ecb_likely(expr) ecb_expect ((expr) ? 1 : 0, 1) 111#define ecb_likely(expr) ecb_expect_true (expr)
112#define ecb_unlikely(expr) ecb_expect_false (expr)
94 113
95/* try to tell the compiler that some condition is definitely true */ 114/* try to tell the compiler that some condition is definitely true */
96#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 115#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
97 116
98/* count trailing zero bits and count # of one bits */ 117/* count trailing zero bits and count # of one bits */
99#if ECB_GCC_VERSION(3,4) 118#if ECB_GCC_VERSION(3,4)
100ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 119 #define ecb_ctz32(x) __builtin_ctz (x)
101ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 120 #define ecb_popcount32(x) __builtin_popcount (x)
102#else 121#else
122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
103ECB_HEADER_INLINE 123 ECB_HEADER_INLINE int
104ecb_ctz32 (uint32_t x) ecb_const 124 ecb_ctz32 (uint32_t x)
105{ 125 {
106 int r = 0; 126 int r = 0;
107 127
108 x &= -x; /* this isolates the lowest bit */ 128 x &= -x; /* this isolates the lowest bit */
109 129
110 if (x & 0xaaaaaaaa) r += 1; 130 if (x & 0xaaaaaaaa) r += 1;
111 if (x & 0xcccccccc) r += 2; 131 if (x & 0xcccccccc) r += 2;
112 if (x & 0xf0f0f0f0) r += 4; 132 if (x & 0xf0f0f0f0) r += 4;
113 if (x & 0xff00ff00) r += 8; 133 if (x & 0xff00ff00) r += 8;
114 if (x & 0xffff0000) r += 16; 134 if (x & 0xffff0000) r += 16;
115 135
116 return r; 136 return r;
117} 137 }
118 138
139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
119ECB_HEADER_INLINE 140 ECB_HEADER_INLINE int
120ecb_popcount32 (uint32_t x) ecb_const 141 ecb_popcount32 (uint32_t x)
121{ 142 {
122 x -= (x >> 1) & 0x55555555; 143 x -= (x >> 1) & 0x55555555;
123 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
124 x = ((x >> 4) + x) & 0x0f0f0f0f; 145 x = ((x >> 4) + x) & 0x0f0f0f0f;
125 x *= 0x01010101; 146 x *= 0x01010101;
126 147
127 return x >> 24; 148 return x >> 24;
128} 149 }
129#endif 150#endif
130 151
152#if ECB_GCC_VERSION(4,3)
153 #define ecb_bswap32(x) __builtin_bswap32 (x)
154 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
155#else
156 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
157 ECB_HEADER_INLINE uint32_t
158 ecb_bswap32 (uint32_t x)
159 {
160 return (x >> 24)
161 | ((x >> 8) & 0x0000ff00)
162 | ((x << 8) & 0x00ff0000)
163 | (x << 24);
164 }
165
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
176#if ECB_GCC_VERSION(4,5)
177 #define ecb_unreachable() __builtin_unreachable ()
178#else
179 /* this seems to work fine, but gcc always emits a warning for it :/ */
180 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
181 ECB_HEADER_INLINE void ecb_unreachable (void) { }
182#endif
183
184ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
131ECB_HEADER_INLINE unsigned char 185ECB_HEADER_INLINE unsigned char
132ecb_byteorder_helper () ecb_const 186ecb_byteorder_helper (void)
133{ 187{
134 const uint32_t u = 0x11223344; 188 const uint32_t u = 0x11223344;
135 return *(unsigned char *)&u; 189 return *(unsigned char *)&u;
136} 190}
137 191
192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
138ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 193ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
139ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { 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
140 202
141#if ecb_cplusplus_does_not_suck 203#if ecb_cplusplus_does_not_suck
142// 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)
143template<typename T, int N> 205 template<typename T, int N>
144static inline int ecb_array_length (const T (&arr)[N]) 206 static inline int ecb_array_length (const T (&arr)[N])
145{ 207 {
146 return N; 208 return N;
147} 209 }
148#else 210#else
149#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
150#endif 212#endif
151 213
214ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
152ECB_INLINE uint32_t 215ECB_INLINE uint32_t
153ecb_rotr32 (uint32_t x, unsigned int count) 216ecb_rotr32 (uint32_t x, unsigned int count)
154{ 217{
155 return (x << (32 - count)) | (x >> count); 218 return (x << (32 - count)) | (x >> count);
156} 219}
157 220
221ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
158ECB_INLINE uint32_t 222ECB_INLINE uint32_t
159ecb_rotl32 (uint32_t x, unsigned int count) 223ecb_rotl32 (uint32_t x, unsigned int count)
160{ 224{
161 return (x >> (32 - count)) | (x << count); 225 return (x >> (32 - count)) | (x << count);
162} 226}
163 227
164#if ECB_GCC_VERSION(4,3)
165# define ecb_bswap32(x) __builtin_bswap32 (x)
166#else
167ECB_GCC_VERSION uint32_t
168ecb_bswap32 (uint32_t x)
169{
170 return (x >> 24)
171 | ((x >> 8) & 0x0000ff00)
172 | ((x << 8) & 0x00ff0000)
173 | (x << 24);
174}
175#endif 228#endif
176 229
177#endif
178

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