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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 1.48 by root, Fri Jun 17 16:17:26 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:
… …
28 */ 28 */
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33#ifdef _WIN32
34 typedef signed char int8_t;
35 typedef unsigned char uint8_t;
36 typedef signed short int16_t;
37 typedef unsigned short uint16_t;
38 typedef signed int int32_t;
39 typedef unsigned int uint32_t;
40 #if __GNUC__
41 typedef signed long long int64_t;
42 typedef unsigned long long uint64_t;
43 #else
44 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t;
46 #endif
47#else
33#include <inttypes.h> 48 #include <inttypes.h>
49#endif
34 50
51/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions,
53 * causing enourmous grief in return for some better fake benchmark numbers.
54 * or so.
55 * we try to detect these and simply assume they are not gcc - if they have
56 * an issue with that they should have done it right in the first place.
57 */
58#ifndef ECB_GCC_VERSION
59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
60 #define ECB_GCC_VERSION(major,minor) 0
61 #else
35#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif
64#endif
36 65
66#define ECB_C99 (__STDC_VERSION__ >= 199901L)
67
37#ifndef __cplusplus 68#if __cplusplus
38# if __STDC_VERSION__ >= 199901L 69 #define ecb_inline static inline
39# define ECB_INLINE inline 70#elif ECB_GCC_VERSION(2,5)
40typedef _Bool ecb_bool; 71 #define ecb_inline static __inline__
72#elif ECB_C99
73 #define ecb_inline static inline
41# else 74#else
42# define ECB_INLINE inline /* yeah! */ 75 #define ecb_inline static
76#endif
77
78#if ECB_GCC_VERSION(3,3)
79 #define ecb_restrict __restrict__
80#elif ECB_C99
81 #define ecb_restrict restrict
82#else
83 #define ecb_restrict
84#endif
85
43typedef int ecb_bool; 86typedef int ecb_bool;
44# endif
45#endif
46 87
47#define ECB_CONCAT_(a, b) a ## b 88#define ECB_CONCAT_(a, b) a ## b
48#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 89#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
49#define ECB_STRINGIFY_(a) # a 90#define ECB_STRINGIFY_(a) # a
50#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 91#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
51 92
52#define ECB_HEADER_INLINE static ECB_INLINE 93#define ecb_function_ ecb_inline
53 94
54#if ECB_GCC_VERSION(3,1) 95#if ECB_GCC_VERSION(3,1)
55# define ecb_attribute(attrlist) __attribute__(attrlist) 96 #define ecb_attribute(attrlist) __attribute__(attrlist)
56# define ecb_is_constant(c) __builtin_constant_p (c) 97 #define ecb_is_constant(expr) __builtin_constant_p (expr)
57# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 98 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
58# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 99 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
59#else 100#else
60# define ecb_attribute(attrlist) 101 #define ecb_attribute(attrlist)
61# define ecb_is_constant(c) 0 102 #define ecb_is_constant(expr) 0
62# define ecb_expect(expr,value) (expr) 103 #define ecb_expect(expr,value) (expr)
63# define ecb_prefetch(addr,rw,locality) 104 #define ecb_prefetch(addr,rw,locality)
64#endif 105#endif
65 106
66/* no emulation for ecb_decltype */ 107/* no emulation for ecb_decltype */
67#if ECB_GCC_VERSION(4,5) 108#if ECB_GCC_VERSION(4,5)
68# define ecb_decltype(x) __decltype(x) 109 #define ecb_decltype(x) __decltype(x)
69#elif ECB_GCC_VERSION(3,0) 110#elif ECB_GCC_VERSION(3,0)
70# define ecb_decltype(x) typeof(x) 111 #define ecb_decltype(x) __typeof(x)
71#endif 112#endif
72 113
73#define ecb_noinline ecb_attribute ((noinline)) 114#define ecb_noinline ecb_attribute ((__noinline__))
74#define ecb_noreturn ecb_attribute ((noreturn)) 115#define ecb_noreturn ecb_attribute ((__noreturn__))
75#define ecb_unused ecb_attribute ((unused)) 116#define ecb_unused ecb_attribute ((__unused__))
76#define ecb_const ecb_attribute ((const)) 117#define ecb_const ecb_attribute ((__const__))
77#define ecb_pure ecb_attribute ((pure)) 118#define ecb_pure ecb_attribute ((__pure__))
78#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
79#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
80 119
81#if ECB_GCC_VERSION(4,5) 120#if ECB_GCC_VERSION(4,3)
82# define ecb_unreachable() __builtin_unreachable () 121 #define ecb_artificial ecb_attribute ((__artificial__))
122 #define ecb_hot ecb_attribute ((__hot__))
123 #define ecb_cold ecb_attribute ((__cold__))
83#else 124#else
84/* this seems to work fine, but gcc always emits a warning for it :/ */ 125 #define ecb_artificial
85ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 126 #define ecb_hot
86ECB_HEADER_INLINE void ecb_unreachable () { } 127 #define ecb_cold
87#endif 128#endif
88 129
89/* put into ifs if you are very sure that the expression */ 130/* put around conditional expressions if you are very sure that the */
90/* is mostly true or mosty false. note that these return */ 131/* expression is mostly true or mostly false. note that these return */
91/* booleans, not the expression. */ 132/* booleans, not the expression. */
92#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 133#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
134#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
135/* for compatibility to the rest of the world */
93#define ecb_likely(expr) ecb_expect (!!(expr), 1) 136#define ecb_likely(expr) ecb_expect_true (expr)
94 137#define ecb_unlikely(expr) ecb_expect_false (expr)
95/* try to tell the compiler that some condition is definitely true */
96#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0)
97 138
98/* count trailing zero bits and count # of one bits */ 139/* count trailing zero bits and count # of one bits */
99#if ECB_GCC_VERSION(3,4) 140#if ECB_GCC_VERSION(3,4)
100ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 141 #define ecb_ctz32(x) __builtin_ctz (x)
101ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 142 #define ecb_popcount32(x) __builtin_popcount (x)
102#else 143#else
103ECB_HEADER_INLINE 144 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
145 ecb_function_ int
104ecb_ctz32 (uint32_t x) ecb_const 146 ecb_ctz32 (uint32_t x)
105{ 147 {
106 int r = 0; 148 int r = 0;
107 149
108 x &= -x; /* this isolates the lowest bit */ 150 x &= ~x + 1; /* this isolates the lowest bit */
109 151
110 if (x & 0xaaaaaaaa) r += 1; 152 if (x & 0xaaaaaaaa) r += 1;
111 if (x & 0xcccccccc) r += 2; 153 if (x & 0xcccccccc) r += 2;
112 if (x & 0xf0f0f0f0) r += 4; 154 if (x & 0xf0f0f0f0) r += 4;
113 if (x & 0xff00ff00) r += 8; 155 if (x & 0xff00ff00) r += 8;
114 if (x & 0xffff0000) r += 16; 156 if (x & 0xffff0000) r += 16;
115 157
116 return r; 158 return r;
117} 159 }
118 160
119ECB_HEADER_INLINE 161 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
162 ecb_function_ int
120ecb_popcount32 (uint32_t x) ecb_const 163 ecb_popcount32 (uint32_t x)
121{ 164 {
122 x -= (x >> 1) & 0x55555555; 165 x -= (x >> 1) & 0x55555555;
123 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 166 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
124 x = ((x >> 4) + x) & 0x0f0f0f0f; 167 x = ((x >> 4) + x) & 0x0f0f0f0f;
125 x *= 0x01010101; 168 x *= 0x01010101;
126 169
127 return x >> 24; 170 return x >> 24;
128} 171 }
129#endif 172#endif
130 173
131ECB_HEADER_INLINE unsigned char 174#if ECB_GCC_VERSION(4,3)
175 #define ecb_bswap32(x) __builtin_bswap32 (x)
176 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
177#else
178 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
179 ecb_function_ uint32_t
180 ecb_bswap32 (uint32_t x)
181 {
182 return (x >> 24)
183 | ((x >> 8) & 0x0000ff00)
184 | ((x << 8) & 0x00ff0000)
185 | (x << 24);
186 }
187
188 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const;
189 ecb_function_ uint32_t
190 ecb_bswap16 (uint32_t x)
191 {
192 return ((x >> 8) & 0xff)
193 | ((x << 8) & 0x00ff0000)
194 | (x << 24);
195 }
196#endif
197
198#if ECB_GCC_VERSION(4,5)
199 #define ecb_unreachable() __builtin_unreachable ()
200#else
201 /* this seems to work fine, but gcc always emits a warning for it :/ */
202 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
203 ecb_function_ void ecb_unreachable (void) { }
204#endif
205
206/* try to tell the compiler that some condition is definitely true */
207#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
208
209ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
210ecb_function_ unsigned char
132ecb_byteorder_helper () ecb_const 211ecb_byteorder_helper (void)
133{ 212{
134 const uint32_t u = 0x11223344; 213 const uint32_t u = 0x11223344;
135 return *(unsigned char *)&u; 214 return *(unsigned char *)&u;
136} 215}
137 216
217ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
138ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 218ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
219ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
139ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 220ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
221
222#if ECB_GCC_VERSION(3,0) || ECB_C99
223 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
224#else
225 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
226#endif
140 227
141#if ecb_cplusplus_does_not_suck 228#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) 229 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
143template<typename T, int N> 230 template<typename T, int N>
144static inline int ecb_array_length (const T (&arr)[N]) 231 static inline int ecb_array_length (const T (&arr)[N])
145{ 232 {
146 return N; 233 return N;
147} 234 }
148#else 235#else
149#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 236 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
150#endif 237#endif
151 238
152ECB_INLINE uint32_t 239ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
240ecb_inline uint32_t
153ecb_rotr32 (uint32_t x, unsigned int count) 241ecb_rotr32 (uint32_t x, unsigned int count)
154{ 242{
155 return (x << (32 - count)) | (x >> count); 243 return (x << (32 - count)) | (x >> count);
156} 244}
157 245
158ECB_INLINE uint32_t 246ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
247ecb_inline uint32_t
159ecb_rotl32 (uint32_t x, unsigned int count) 248ecb_rotl32 (uint32_t x, unsigned int count)
160{ 249{
161 return (x >> (32 - count)) | (x << count); 250 return (x >> (32 - count)) | (x << count);
162} 251}
163 252
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 253#endif
176 254
177#endif
178

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