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Comparing libecb/ecb.h (file contents):
Revision 1.13 by root, Thu May 26 18:21:04 2011 UTC vs.
Revision 1.31 by root, Tue May 31 21:10:37 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 */
42#ifndef ECB_GCC_VERSION
41#if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 43# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
42# define ECB_GCC_VERSION(major,minor) 0 44# define ECB_GCC_VERSION(major,minor) 0
43#else 45# else
44# 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
45#endif 48#endif
46 49
47#ifndef __cplusplus 50#ifndef __cplusplus
48# if __STDC_VERSION__ >= 199901L 51# if __STDC_VERSION__ >= 199901L
49# define ECB_INLINE inline 52# define ECB_INLINE inline
50typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
51# else 54# else
52# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE inline /* yeah! */
53typedef int ecb_bool; 56typedef int ecb_bool;
54# endif 57# endif
58#else
59# define ECB_INLINE inline
60typedef bool ecb_bool;
55#endif 61#endif
56 62
57#define ECB_CONCAT_(a, b) a ## b 63#define ECB_CONCAT_(a, b) a ## b
58#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
59#define ECB_STRINGIFY_(a) # a 65#define ECB_STRINGIFY_(a) # a
… …
61 67
62#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE static ECB_INLINE
63 69
64#if ECB_GCC_VERSION(3,1) 70#if ECB_GCC_VERSION(3,1)
65# define ecb_attribute(attrlist) __attribute__(attrlist) 71# define ecb_attribute(attrlist) __attribute__(attrlist)
66# define ecb_is_constant(c) __builtin_constant_p (c) 72# define ecb_is_constant(expr) __builtin_constant_p (expr)
67# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 73# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
68# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 74# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
69#else 75#else
70# define ecb_attribute(attrlist) 76# define ecb_attribute(attrlist)
71# define ecb_is_constant(c) 0 77# define ecb_is_constant(expr) 0
72# define ecb_expect(expr,value) (expr) 78# define ecb_expect(expr,value) (expr)
73# define ecb_prefetch(addr,rw,locality) 79# define ecb_prefetch(addr,rw,locality)
74#endif 80#endif
75 81
76/* no emulation for ecb_decltype */ 82/* no emulation for ecb_decltype */
… …
78# define ecb_decltype(x) __decltype(x) 84# define ecb_decltype(x) __decltype(x)
79#elif ECB_GCC_VERSION(3,0) 85#elif ECB_GCC_VERSION(3,0)
80# define ecb_decltype(x) typeof(x) 86# define ecb_decltype(x) typeof(x)
81#endif 87#endif
82 88
89#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
83#define ecb_noinline ecb_attribute ((noinline)) 90#define ecb_noinline ecb_attribute ((__noinline__))
84#define ecb_noreturn ecb_attribute ((noreturn)) 91#define ecb_noreturn ecb_attribute ((__noreturn__))
85#define ecb_unused ecb_attribute ((unused)) 92#define ecb_unused ecb_attribute ((__unused__))
86#define ecb_const ecb_attribute ((const)) 93#define ecb_const ecb_attribute ((__const__))
87#define ecb_pure ecb_attribute ((pure)) 94#define ecb_pure ecb_attribute ((__pure__))
88#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 95#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
89#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 96#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
90 97
91/* put into ifs if you are very sure that the expression */ 98/* put into if's if you are very sure that the expression */
92/* is mostly true or mosty false. note that these return */ 99/* is mostly true or mosty false. note that these return */
93/* booleans, not the expression. */ 100/* booleans, not the expression. */
94#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 101#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
95#define ecb_likely(expr) ecb_expect (!!(expr), 1) 102#define ecb_likely(expr) ecb_expect (!!(expr), 1)
96 103
97/* try to tell the compiler that some condition is definitely true */ 104/* try to tell the compiler that some condition is definitely true */
98#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 105#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
99 106
100/* count trailing zero bits and count # of one bits */ 107/* count trailing zero bits and count # of one bits */
101#if ECB_GCC_VERSION(3,4) 108#if ECB_GCC_VERSION(3,4)
102ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 109#define ecb_ctz32(x) __builtin_ctz (x)
103ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 110#define ecb_popcount32(x) __builtin_popcount (x)
104#else 111#else
112ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
105ECB_HEADER_INLINE 113ECB_HEADER_INLINE
106ecb_ctz32 (uint32_t x) ecb_const 114ecb_ctz32 (uint32_t x)
107{ 115{
108 int r = 0; 116 int r = 0;
109 117
110 x &= -x; /* this isolates the lowest bit */ 118 x &= -x; /* this isolates the lowest bit */
111 119
… …
116 if (x & 0xffff0000) r += 16; 124 if (x & 0xffff0000) r += 16;
117 125
118 return r; 126 return r;
119} 127}
120 128
129ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
121ECB_HEADER_INLINE 130ECB_HEADER_INLINE
122ecb_popcount32 (uint32_t x) ecb_const 131ecb_popcount32 (uint32_t x)
123{ 132{
124 x -= (x >> 1) & 0x55555555; 133 x -= (x >> 1) & 0x55555555;
125 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 134 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
126 x = ((x >> 4) + x) & 0x0f0f0f0f; 135 x = ((x >> 4) + x) & 0x0f0f0f0f;
127 x *= 0x01010101; 136 x *= 0x01010101;
… …
129 return x >> 24; 138 return x >> 24;
130} 139}
131#endif 140#endif
132 141
133#if ECB_GCC_VERSION(4,3) 142#if ECB_GCC_VERSION(4,3)
134ECB_GCC_VERSION uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); } 143# define ecb_bswap32(x) __builtin_bswap32 (x)
144# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
135#else 145#else
136ECB_GCC_VERSION uint32_t 146ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
147ECB_HEADER_INLINE uint32_t
137ecb_bswap32 (uint32_t x) 148ecb_bswap32 (uint32_t x)
138{ 149{
139 return (x >> 24) 150 return (x >> 24)
140 | ((x >> 8) & 0x0000ff00) 151 | ((x >> 8) & 0x0000ff00)
141 | ((x << 8) & 0x00ff0000) 152 | ((x << 8) & 0x00ff0000)
142 | (x << 24); 153 | (x << 24);
143} 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}
144#endif 164#endif
145 165
146#if ECB_GCC_VERSION(4,5) 166#if ECB_GCC_VERSION(4,5)
147# define ecb_unreachable() __builtin_unreachable () 167# define ecb_unreachable() __builtin_unreachable ()
148#else 168#else
149/* this seems to work fine, but gcc always emits a warning for it :/ */ 169/* this seems to work fine, but gcc always emits a warning for it :/ */
150ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 170ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
151ECB_HEADER_INLINE void ecb_unreachable () { } 171ECB_HEADER_INLINE void ecb_unreachable (void) { }
152#endif 172#endif
153 173
174ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
154ECB_HEADER_INLINE unsigned char 175ECB_HEADER_INLINE unsigned char
155ecb_byteorder_helper () ecb_const 176ecb_byteorder_helper (void)
156{ 177{
157 const uint32_t u = 0x11223344; 178 const uint32_t u = 0x11223344;
158 return *(unsigned char *)&u; 179 return *(unsigned char *)&u;
159} 180}
160 181
182ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
161ECB_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;
162ECB_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#if ECB_GCC_VERSION(3,0)&&0
188# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
189#else
190# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
191#endif
163 192
164#if ecb_cplusplus_does_not_suck 193#if ecb_cplusplus_does_not_suck
165// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 194// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
166template<typename T, int N> 195template<typename T, int N>
167static inline int ecb_array_length (const T (&arr)[N]) 196static inline int ecb_array_length (const T (&arr)[N])
… …
170} 199}
171#else 200#else
172#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 201#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
173#endif 202#endif
174 203
204ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
175ECB_INLINE uint32_t 205ECB_INLINE uint32_t
176ecb_rotr32 (uint32_t x, unsigned int count) 206ecb_rotr32 (uint32_t x, unsigned int count)
177{ 207{
178 return (x << (32 - count)) | (x >> count); 208 return (x << (32 - count)) | (x >> count);
179} 209}
180 210
211ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
181ECB_INLINE uint32_t 212ECB_INLINE uint32_t
182ecb_rotl32 (uint32_t x, unsigned int count) 213ecb_rotl32 (uint32_t x, unsigned int count)
183{ 214{
184 return (x >> (32 - count)) | (x << count); 215 return (x >> (32 - count)) | (x << count);
185} 216}

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