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Comparing libecb/ecb.h (file contents):
Revision 1.12 by root, Thu May 26 18:17:45 2011 UTC vs.
Revision 1.36 by root, Sat Jun 11 13:25:52 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 static inline
50typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
51# else 54# else
52# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE static inline /* yeah! */
53typedef int ecb_bool; 56typedef int ecb_bool;
54# endif 57# endif
58#else
59# define ECB_INLINE static 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
60#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
61 67
62#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE 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
83#define ecb_noinline ecb_attribute ((noinline)) 89#define ecb_noinline ecb_attribute ((__noinline__))
84#define ecb_noreturn ecb_attribute ((noreturn)) 90#define ecb_noreturn ecb_attribute ((__noreturn__))
85#define ecb_unused ecb_attribute ((unused)) 91#define ecb_unused ecb_attribute ((__unused__))
86#define ecb_const ecb_attribute ((const)) 92#define ecb_const ecb_attribute ((__const__))
87#define ecb_pure ecb_attribute ((pure)) 93#define ecb_pure ecb_attribute ((__pure__))
88#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
89#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
90 94
91#if ECB_GCC_VERSION(4,5) 95#if ECB_GCC_VERSION(4,3)
92# 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 */
93#else 99#else
94/* this seems to work fine, but gcc always emits a warning for it :/ */ 100 #define ecb_artificial
95ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 101 #define ecb_hot
96ECB_HEADER_INLINE void ecb_unreachable () { } 102 #define ecb_cold
97#endif 103#endif
98 104
99/* put into ifs if you are very sure that the expression */ 105/* put into if's if you are very sure that the expression */
100/* is mostly true or mosty false. note that these return */ 106/* is mostly true or mostly false. note that these return */
101/* booleans, not the expression. */ 107/* booleans, not the expression. */
102#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 */
103#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)
104 113
105/* try to tell the compiler that some condition is definitely true */ 114/* try to tell the compiler that some condition is definitely true */
106#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 115#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
107 116
108/* count trailing zero bits and count # of one bits */ 117/* count trailing zero bits and count # of one bits */
109#if ECB_GCC_VERSION(3,4) 118#if ECB_GCC_VERSION(3,4)
110ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 119 #define ecb_ctz32(x) __builtin_ctz (x)
111ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 120 #define ecb_popcount32(x) __builtin_popcount (x)
112#else 121#else
122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
113ECB_HEADER_INLINE 123 ECB_HEADER_INLINE int
114ecb_ctz32 (uint32_t x) ecb_const 124 ecb_ctz32 (uint32_t x)
115{ 125 {
116 int r = 0; 126 int r = 0;
117 127
118 x &= -x; /* this isolates the lowest bit */ 128 x &= -x; /* this isolates the lowest bit */
119 129
120 if (x & 0xaaaaaaaa) r += 1; 130 if (x & 0xaaaaaaaa) r += 1;
121 if (x & 0xcccccccc) r += 2; 131 if (x & 0xcccccccc) r += 2;
122 if (x & 0xf0f0f0f0) r += 4; 132 if (x & 0xf0f0f0f0) r += 4;
123 if (x & 0xff00ff00) r += 8; 133 if (x & 0xff00ff00) r += 8;
124 if (x & 0xffff0000) r += 16; 134 if (x & 0xffff0000) r += 16;
125 135
126 return r; 136 return r;
127} 137 }
128 138
139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
129ECB_HEADER_INLINE 140 ECB_HEADER_INLINE int
130ecb_popcount32 (uint32_t x) ecb_const 141 ecb_popcount32 (uint32_t x)
131{ 142 {
132 x -= (x >> 1) & 0x55555555; 143 x -= (x >> 1) & 0x55555555;
133 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
134 x = ((x >> 4) + x) & 0x0f0f0f0f; 145 x = ((x >> 4) + x) & 0x0f0f0f0f;
135 x *= 0x01010101; 146 x *= 0x01010101;
136 147
137 return x >> 24; 148 return x >> 24;
138} 149 }
139#endif 150#endif
140 151
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;
141ECB_HEADER_INLINE unsigned char 185ECB_HEADER_INLINE unsigned char
142ecb_byteorder_helper () ecb_const 186ecb_byteorder_helper (void)
143{ 187{
144 const uint32_t u = 0x11223344; 188 const uint32_t u = 0x11223344;
145 return *(unsigned char *)&u; 189 return *(unsigned char *)&u;
146} 190}
147 191
192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
148ECB_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;
149ECB_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
150 202
151#if ecb_cplusplus_does_not_suck 203#if ecb_cplusplus_does_not_suck
152// 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)
153template<typename T, int N> 205 template<typename T, int N>
154static inline int ecb_array_length (const T (&arr)[N]) 206 static inline int ecb_array_length (const T (&arr)[N])
155{ 207 {
156 return N; 208 return N;
157} 209 }
158#else 210#else
159#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
160#endif 212#endif
161 213
214ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
162ECB_INLINE uint32_t 215ECB_INLINE uint32_t
163ecb_rotr32 (uint32_t x, unsigned int count) 216ecb_rotr32 (uint32_t x, unsigned int count)
164{ 217{
165 return (x << (32 - count)) | (x >> count); 218 return (x << (32 - count)) | (x >> count);
166} 219}
167 220
221ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
168ECB_INLINE uint32_t 222ECB_INLINE uint32_t
169ecb_rotl32 (uint32_t x, unsigned int count) 223ecb_rotl32 (uint32_t x, unsigned int count)
170{ 224{
171 return (x >> (32 - count)) | (x << count); 225 return (x >> (32 - count)) | (x << count);
172} 226}
173 227
174#if ECB_GCC_VERSION(4,3)
175ECB_GCC_VERSION uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); }
176#else
177ECB_GCC_VERSION uint32_t
178ecb_bswap32 (uint32_t x)
179{
180 return (x >> 24)
181 | ((x >> 8) & 0x0000ff00)
182 | ((x << 8) & 0x00ff0000)
183 | (x << 24);
184}
185#endif 228#endif
186 229
187#endif
188

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