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Comparing libecb/ecb.h (file contents):
Revision 1.16 by root, Thu May 26 18:34:23 2011 UTC vs.
Revision 1.40 by root, Sat Jun 11 17:34:57 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 */
41#ifndef ECB_GCC_VERSION 42#ifndef ECB_GCC_VERSION
42# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
43# define ECB_GCC_VERSION(major,minor) 0 44 #define ECB_GCC_VERSION(major,minor) 0
44# else 45 #else
45# 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
46# endif 48#endif
47#endif
48 49
50#define ECB_C99 (__STDC_VERSION__ >= 199901L)
51
49#ifndef __cplusplus 52#if __cplusplus
50# if __STDC_VERSION__ >= 199901L
51# define ECB_INLINE inline 53 #define ECB_INLINE static inline
52typedef _Bool ecb_bool; 54#elif ECB_GCC_VERSION(2,5)
55 #define ECB_INLINE static __inline__
56#elif ECB_C99
57 #define ECB_INLINE static inline
53# else 58#else
54# define ECB_INLINE inline /* yeah! */ 59 #define ECB_INLINE static
60#endif
61
62#if ECB_GCC_VERSION(3,3)
63 #define ecb_restrict __restrict__
64#elif ECB_C99
65 #define ecb_restrict restrict
66#else
67 #define ecb_restrict
68#endif
69
55typedef int ecb_bool; 70typedef int ecb_bool;
56# endif
57#endif
58 71
59#define ECB_CONCAT_(a, b) a ## b 72#define ECB_CONCAT_(a, b) a ## b
60#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 73#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
61#define ECB_STRINGIFY_(a) # a 74#define ECB_STRINGIFY_(a) # a
62#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 75#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
63 76
64#define ECB_HEADER_INLINE static ECB_INLINE 77#define ecb_function_ ECB_INLINE
65 78
66#if ECB_GCC_VERSION(3,1) 79#if ECB_GCC_VERSION(3,1)
67# define ecb_attribute(attrlist) __attribute__(attrlist) 80 #define ecb_attribute(attrlist) __attribute__(attrlist)
68# define ecb_is_constant(c) __builtin_constant_p (c) 81 #define ecb_is_constant(expr) __builtin_constant_p (expr)
69# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 82 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
70# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 83 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
71#else 84#else
72# define ecb_attribute(attrlist) 85 #define ecb_attribute(attrlist)
73# define ecb_is_constant(c) 0 86 #define ecb_is_constant(expr) 0
74# define ecb_expect(expr,value) (expr) 87 #define ecb_expect(expr,value) (expr)
75# define ecb_prefetch(addr,rw,locality) 88 #define ecb_prefetch(addr,rw,locality)
76#endif 89#endif
77 90
78/* no emulation for ecb_decltype */ 91/* no emulation for ecb_decltype */
79#if ECB_GCC_VERSION(4,5) 92#if ECB_GCC_VERSION(4,5)
80# define ecb_decltype(x) __decltype(x) 93 #define ecb_decltype(x) __decltype(x)
81#elif ECB_GCC_VERSION(3,0) 94#elif ECB_GCC_VERSION(3,0)
82# define ecb_decltype(x) typeof(x) 95 #define ecb_decltype(x) __typeof(x)
83#endif 96#endif
84 97
85#define ecb_noinline ecb_attribute ((noinline)) 98#define ecb_noinline ecb_attribute ((__noinline__))
86#define ecb_noreturn ecb_attribute ((noreturn)) 99#define ecb_noreturn ecb_attribute ((__noreturn__))
87#define ecb_unused ecb_attribute ((unused)) 100#define ecb_unused ecb_attribute ((__unused__))
88#define ecb_const ecb_attribute ((const)) 101#define ecb_const ecb_attribute ((__const__))
89#define ecb_pure ecb_attribute ((pure)) 102#define ecb_pure ecb_attribute ((__pure__))
103
104#if ECB_GCC_VERSION(4,3)
105 #define ecb_artificial ecb_attribute ((__artificial__))
90#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 106 #define ecb_hot ecb_attribute ((__hot__))
91#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 107 #define ecb_cold ecb_attribute ((__cold__))
108#else
109 #define ecb_artificial
110 #define ecb_hot
111 #define ecb_cold
112#endif
92 113
93/* put into ifs if you are very sure that the expression */ 114/* put around conditional expressions if you are very sure that the */
94/* is mostly true or mosty false. note that these return */ 115/* expression is mostly true or mostly false. note that these return */
95/* booleans, not the expression. */ 116/* booleans, not the expression. */
96#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 117#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
118#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
119/* for compatibility to the rest of the world */
97#define ecb_likely(expr) ecb_expect (!!(expr), 1) 120#define ecb_likely(expr) ecb_expect_true (expr)
121#define ecb_unlikely(expr) ecb_expect_false (expr)
98 122
99/* try to tell the compiler that some condition is definitely true */ 123/* try to tell the compiler that some condition is definitely true */
100#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 124#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
101 125
102/* count trailing zero bits and count # of one bits */ 126/* count trailing zero bits and count # of one bits */
103#if ECB_GCC_VERSION(3,4) 127#if ECB_GCC_VERSION(3,4)
104#define ecb_ctz32 (x) __builtin_ctz (x) 128 #define ecb_ctz32(x) __builtin_ctz (x)
105#define ecb_popcount32 (x) __builtin_popcount (x) 129 #define ecb_popcount32(x) __builtin_popcount (x)
106#else 130#else
107ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 131 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
108ECB_HEADER_INLINE 132 ecb_function_ int
109ecb_ctz32 (uint32_t x) 133 ecb_ctz32 (uint32_t x)
110{ 134 {
111 int r = 0; 135 int r = 0;
112 136
113 x &= -x; /* this isolates the lowest bit */ 137 x &= -x; /* this isolates the lowest bit */
114 138
115 if (x & 0xaaaaaaaa) r += 1; 139 if (x & 0xaaaaaaaa) r += 1;
116 if (x & 0xcccccccc) r += 2; 140 if (x & 0xcccccccc) r += 2;
117 if (x & 0xf0f0f0f0) r += 4; 141 if (x & 0xf0f0f0f0) r += 4;
118 if (x & 0xff00ff00) r += 8; 142 if (x & 0xff00ff00) r += 8;
119 if (x & 0xffff0000) r += 16; 143 if (x & 0xffff0000) r += 16;
120 144
121 return r; 145 return r;
122} 146 }
123 147
124ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 148 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
125ECB_HEADER_INLINE 149 ecb_function_ int
126ecb_popcount32 (uint32_t x) 150 ecb_popcount32 (uint32_t x)
127{ 151 {
128 x -= (x >> 1) & 0x55555555; 152 x -= (x >> 1) & 0x55555555;
129 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 153 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
130 x = ((x >> 4) + x) & 0x0f0f0f0f; 154 x = ((x >> 4) + x) & 0x0f0f0f0f;
131 x *= 0x01010101; 155 x *= 0x01010101;
132 156
133 return x >> 24; 157 return x >> 24;
134} 158 }
135#endif 159#endif
136 160
137#if ECB_GCC_VERSION(4,3) 161#if ECB_GCC_VERSION(4,3)
138# define ecb_bswap32(x) __builtin_bswap32 (x) 162 #define ecb_bswap32(x) __builtin_bswap32 (x)
163 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
139#else 164#else
140ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 165 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
141ECB_HEADER_INLINE uint32_t 166 ecb_function_ uint32_t
142ecb_bswap32 (uint32_t x) 167 ecb_bswap32 (uint32_t x)
143{ 168 {
144 return (x >> 24) 169 return (x >> 24)
145 | ((x >> 8) & 0x0000ff00) 170 | ((x >> 8) & 0x0000ff00)
146 | ((x << 8) & 0x00ff0000) 171 | ((x << 8) & 0x00ff0000)
147 | (x << 24); 172 | (x << 24);
148} 173 }
174
175 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const;
176 ecb_function_ uint32_t
177 ecb_bswap16 (uint32_t x)
178 {
179 return ((x >> 8) & 0xff)
180 | ((x << 8) & 0x00ff0000)
181 | (x << 24);
182 }
149#endif 183#endif
150 184
151#if ECB_GCC_VERSION(4,5) 185#if ECB_GCC_VERSION(4,5)
152# define ecb_unreachable() __builtin_unreachable () 186 #define ecb_unreachable() __builtin_unreachable ()
153#else 187#else
154/* this seems to work fine, but gcc always emits a warning for it :/ */ 188 /* this seems to work fine, but gcc always emits a warning for it :/ */
155ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn)); 189 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
156ECB_HEADER_INLINE void ecb_unreachable (void) { } 190 ecb_function_ void ecb_unreachable (void) { }
157#endif 191#endif
158 192
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; 193ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
160ECB_HEADER_INLINE unsigned char 194ecb_function_ unsigned char
161ecb_byteorder_helper () 195ecb_byteorder_helper (void)
162{ 196{
163 const uint32_t u = 0x11223344; 197 const uint32_t u = 0x11223344;
164 return *(unsigned char *)&u; 198 return *(unsigned char *)&u;
165} 199}
166 200
167ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 201ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; 202ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
169ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 203ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; 204ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
205
206#if ECB_GCC_VERSION(3,0) || ECB_C99
207 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
208#else
209 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
210#endif
171 211
172#if ecb_cplusplus_does_not_suck 212#if ecb_cplusplus_does_not_suck
173// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 213 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
174template<typename T, int N> 214 template<typename T, int N>
175static inline int ecb_array_length (const T (&arr)[N]) 215 static inline int ecb_array_length (const T (&arr)[N])
176{ 216 {
177 return N; 217 return N;
178} 218 }
179#else 219#else
180#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 220 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
181#endif 221#endif
182 222
183ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 223ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
184ECB_INLINE uint32_t 224ECB_INLINE uint32_t
185ecb_rotr32 (uint32_t x, unsigned int count) 225ecb_rotr32 (uint32_t x, unsigned int count)

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