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Comparing libecb/ecb.h (file contents):
Revision 1.11 by root, Thu May 26 18:00:42 2011 UTC vs.
Revision 1.30 by root, Mon May 30 18:30:00 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 inline
40typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
41# else 54# else
42# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE inline /* yeah! */
43typedef int ecb_bool; 56typedef int ecb_bool;
44# endif 57# endif
58#else
59# define ECB_INLINE inline
60typedef 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
… …
51 67
52#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE static 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 */
… …
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
89#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
73#define ecb_noinline ecb_attribute ((noinline)) 90#define ecb_noinline ecb_attribute ((__noinline__))
74#define ecb_noreturn ecb_attribute ((noreturn)) 91#define ecb_noreturn ecb_attribute ((__noreturn__))
75#define ecb_unused ecb_attribute ((unused)) 92#define ecb_unused ecb_attribute ((__unused__))
76#define ecb_const ecb_attribute ((const)) 93#define ecb_const ecb_attribute ((__const__))
77#define ecb_pure ecb_attribute ((pure)) 94#define ecb_pure ecb_attribute ((__pure__))
78#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 95#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
79#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 96#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
80 97
81#if ECB_GCC_VERSION(4,5)
82# define ecb_unreachable() __builtin_unreachable ()
83#else
84/* this seems to work fine, but gcc always emits a warning for it :/ */
85ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn));
86ECB_HEADER_INLINE void ecb_unreachable () { }
87#endif
88
89/* put into ifs if you are very sure that the expression */ 98/* put into if's if you are very sure that the expression */
90/* is mostly true or mosty false. note that these return */ 99/* is mostly true or mosty false. note that these return */
91/* booleans, not the expression. */ 100/* booleans, not the expression. */
92#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 101#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
93#define ecb_likely(expr) ecb_expect (!!(expr), 1) 102#define ecb_likely(expr) ecb_expect (!!(expr), 1)
94 103
95/* try to tell the compiler that some condition is definitely true */ 104/* try to tell the compiler that some condition is definitely true */
96#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 105#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
97 106
98/* count trailing zero bits and count # of one bits */ 107/* count trailing zero bits and count # of one bits */
99#if ECB_GCC_VERSION(3,4) 108#if ECB_GCC_VERSION(3,4)
100ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 109#define ecb_ctz32(x) __builtin_ctz (x)
101ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 110#define ecb_popcount32(x) __builtin_popcount (x)
102#else 111#else
112ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
103ECB_HEADER_INLINE 113ECB_HEADER_INLINE
104ecb_ctz32 (uint32_t x) ecb_const 114ecb_ctz32 (uint32_t x)
105{ 115{
106 int r = 0; 116 int r = 0;
107 117
108 x &= -x; /* this isolates the lowest bit */ 118 x &= -x; /* this isolates the lowest bit */
109 119
… …
114 if (x & 0xffff0000) r += 16; 124 if (x & 0xffff0000) r += 16;
115 125
116 return r; 126 return r;
117} 127}
118 128
129ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
119ECB_HEADER_INLINE 130ECB_HEADER_INLINE
120ecb_popcount32 (uint32_t x) ecb_const 131ecb_popcount32 (uint32_t x)
121{ 132{
122 x -= (x >> 1) & 0x55555555; 133 x -= (x >> 1) & 0x55555555;
123 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 134 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
124 x = ((x >> 4) + x) & 0x0f0f0f0f; 135 x = ((x >> 4) + x) & 0x0f0f0f0f;
125 x *= 0x01010101; 136 x *= 0x01010101;
126 137
127 return x >> 24; 138 return x >> 24;
128} 139}
129#endif 140#endif
130 141
142#if ECB_GCC_VERSION(4,3)
143# define ecb_bswap32(x) __builtin_bswap32 (x)
144# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
145#else
146ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
147ECB_HEADER_INLINE uint32_t
148ecb_bswap32 (uint32_t x)
149{
150 return (x >> 24)
151 | ((x >> 8) & 0x0000ff00)
152 | ((x << 8) & 0x00ff0000)
153 | (x << 24);
154}
155
156ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
157ECB_HEADER_INLINE uint32_t
158ecb_bswap16 (uint32_t x)
159{
160 return ((x >> 8) & 0xff)
161 | ((x << 8) & 0x00ff0000)
162 | (x << 24);
163}
164#endif
165
166#if ECB_GCC_VERSION(4,5)
167# define ecb_unreachable() __builtin_unreachable ()
168#else
169/* this seems to work fine, but gcc always emits a warning for it :/ */
170ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
171ECB_HEADER_INLINE void ecb_unreachable (void) { }
172#endif
173
174ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
131ECB_HEADER_INLINE unsigned char 175ECB_HEADER_INLINE unsigned char
132ecb_byteorder_helper () ecb_const 176ecb_byteorder_helper (void)
133{ 177{
134 const uint32_t u = 0x11223344; 178 const uint32_t u = 0x11223344;
135 return *(unsigned char *)&u; 179 return *(unsigned char *)&u;
136} 180}
137 181
182ECB_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; }; 183ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
184ECB_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; }; 185ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
186
187#define ecb_mod(m,n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n)))
140 188
141#if ecb_cplusplus_does_not_suck 189#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) 190// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
143template<typename T, int N> 191template<typename T, int N>
144static inline int ecb_array_length (const T (&arr)[N]) 192static inline int ecb_array_length (const T (&arr)[N])
… …
147} 195}
148#else 196#else
149#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 197#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
150#endif 198#endif
151 199
200ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
152ECB_INLINE uint32_t 201ECB_INLINE uint32_t
153ecb_rotr32 (uint32_t x, unsigned int count) 202ecb_rotr32 (uint32_t x, unsigned int count)
154{ 203{
155 return (x << (32 - count)) | (x >> count); 204 return (x << (32 - count)) | (x >> count);
156} 205}
157 206
207ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
158ECB_INLINE uint32_t 208ECB_INLINE uint32_t
159ecb_rotl32 (uint32_t x, unsigned int count) 209ecb_rotl32 (uint32_t x, unsigned int count)
160{ 210{
161 return (x >> (32 - count)) | (x << count); 211 return (x >> (32 - count)) | (x << count);
162} 212}
163 213
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 214#endif
176 215
177#endif
178

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