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Comparing libecb/ecb.h (file contents):
Revision 1.19 by root, Thu May 26 18:43:48 2011 UTC vs.
Revision 1.42 by root, Sun Jun 12 08:14:03 2011 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/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:
… …
38 * or so. 38 * or so.
39 * 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
40 * 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.
41 */ 41 */
42#ifndef ECB_GCC_VERSION 42#ifndef ECB_GCC_VERSION
43# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
44# define ECB_GCC_VERSION(major,minor) 0 44 #define ECB_GCC_VERSION(major,minor) 0
45# else 45 #else
46# 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
47# endif 48#endif
48#endif
49 49
50#define ECB_C99 (__STDC_VERSION__ >= 199901L)
51
50#ifndef __cplusplus 52#if __cplusplus
51# if __STDC_VERSION__ >= 199901L
52# define ECB_INLINE inline 53 #define ECB_INLINE static inline
53typedef _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
54# else 58#else
55# 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
56typedef int ecb_bool; 70typedef int ecb_bool;
57# endif
58#endif
59 71
60#define ECB_CONCAT_(a, b) a ## b 72#define ECB_CONCAT_(a, b) a ## b
61#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 73#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
62#define ECB_STRINGIFY_(a) # a 74#define ECB_STRINGIFY_(a) # a
63#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 75#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
64 76
65#define ECB_HEADER_INLINE static ECB_INLINE 77#define ecb_function_ ECB_INLINE
66 78
67#if ECB_GCC_VERSION(3,1) 79#if ECB_GCC_VERSION(3,1)
68# define ecb_attribute(attrlist) __attribute__(attrlist) 80 #define ecb_attribute(attrlist) __attribute__(attrlist)
69# define ecb_is_constant(c) __builtin_constant_p (c) 81 #define ecb_is_constant(expr) __builtin_constant_p (expr)
70# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 82 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
71# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 83 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
72#else 84#else
73# define ecb_attribute(attrlist) 85 #define ecb_attribute(attrlist)
74# define ecb_is_constant(c) 0 86 #define ecb_is_constant(expr) 0
75# define ecb_expect(expr,value) (expr) 87 #define ecb_expect(expr,value) (expr)
76# define ecb_prefetch(addr,rw,locality) 88 #define ecb_prefetch(addr,rw,locality)
77#endif 89#endif
78 90
79/* no emulation for ecb_decltype */ 91/* no emulation for ecb_decltype */
80#if ECB_GCC_VERSION(4,5) 92#if ECB_GCC_VERSION(4,5)
81# define ecb_decltype(x) __decltype(x) 93 #define ecb_decltype(x) __decltype(x)
82#elif ECB_GCC_VERSION(3,0) 94#elif ECB_GCC_VERSION(3,0)
83# define ecb_decltype(x) typeof(x) 95 #define ecb_decltype(x) __typeof(x)
84#endif 96#endif
85 97
86#define ecb_noinline ecb_attribute ((noinline)) 98#define ecb_noinline ecb_attribute ((__noinline__))
87#define ecb_noreturn ecb_attribute ((noreturn)) 99#define ecb_noreturn ecb_attribute ((__noreturn__))
88#define ecb_unused ecb_attribute ((unused)) 100#define ecb_unused ecb_attribute ((__unused__))
89#define ecb_const ecb_attribute ((const)) 101#define ecb_const ecb_attribute ((__const__))
90#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__))
91#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 106 #define ecb_hot ecb_attribute ((__hot__))
92#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
93 113
94/* put into ifs if you are very sure that the expression */ 114/* put around conditional expressions if you are very sure that the */
95/* is mostly true or mosty false. note that these return */ 115/* expression is mostly true or mostly false. note that these return */
96/* booleans, not the expression. */ 116/* booleans, not the expression. */
97#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 */
98#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)
122
123/* count trailing zero bits and count # of one bits */
124#if ECB_GCC_VERSION(3,4)
125 #define ecb_ctz32(x) __builtin_ctz (x)
126 #define ecb_popcount32(x) __builtin_popcount (x)
127#else
128 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
129 ecb_function_ int
130 ecb_ctz32 (uint32_t x)
131 {
132 int r = 0;
133
134 x &= -x; /* this isolates the lowest bit */
135
136 if (x & 0xaaaaaaaa) r += 1;
137 if (x & 0xcccccccc) r += 2;
138 if (x & 0xf0f0f0f0) r += 4;
139 if (x & 0xff00ff00) r += 8;
140 if (x & 0xffff0000) r += 16;
141
142 return r;
143 }
144
145 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
146 ecb_function_ int
147 ecb_popcount32 (uint32_t x)
148 {
149 x -= (x >> 1) & 0x55555555;
150 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
151 x = ((x >> 4) + x) & 0x0f0f0f0f;
152 x *= 0x01010101;
153
154 return x >> 24;
155 }
156#endif
157
158#if ECB_GCC_VERSION(4,3)
159 #define ecb_bswap32(x) __builtin_bswap32 (x)
160 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
161#else
162 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
163 ecb_function_ uint32_t
164 ecb_bswap32 (uint32_t x)
165 {
166 return (x >> 24)
167 | ((x >> 8) & 0x0000ff00)
168 | ((x << 8) & 0x00ff0000)
169 | (x << 24);
170 }
171
172 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const;
173 ecb_function_ uint32_t
174 ecb_bswap16 (uint32_t x)
175 {
176 return ((x >> 8) & 0xff)
177 | ((x << 8) & 0x00ff0000)
178 | (x << 24);
179 }
180#endif
181
182#if ECB_GCC_VERSION(4,5)
183 #define ecb_unreachable() __builtin_unreachable ()
184#else
185 /* this seems to work fine, but gcc always emits a warning for it :/ */
186 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
187 ecb_function_ void ecb_unreachable (void) { }
188#endif
99 189
100/* try to tell the compiler that some condition is definitely true */ 190/* try to tell the compiler that some condition is definitely true */
101#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 191#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
102 192
103/* count trailing zero bits and count # of one bits */
104#if ECB_GCC_VERSION(3,4)
105#define ecb_ctz32 (x) __builtin_ctz (x)
106#define ecb_popcount32 (x) __builtin_popcount (x)
107#else
108ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
109ECB_HEADER_INLINE
110ecb_ctz32 (uint32_t x)
111{
112 int r = 0;
113
114 x &= -x; /* this isolates the lowest bit */
115
116 if (x & 0xaaaaaaaa) r += 1;
117 if (x & 0xcccccccc) r += 2;
118 if (x & 0xf0f0f0f0) r += 4;
119 if (x & 0xff00ff00) r += 8;
120 if (x & 0xffff0000) r += 16;
121
122 return r;
123}
124
125ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
126ECB_HEADER_INLINE
127ecb_popcount32 (uint32_t x)
128{
129 x -= (x >> 1) & 0x55555555;
130 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
131 x = ((x >> 4) + x) & 0x0f0f0f0f;
132 x *= 0x01010101;
133
134 return x >> 24;
135}
136#endif
137
138#if ECB_GCC_VERSION(4,3)
139# define ecb_bswap32(x) __builtin_bswap32 (x)
140#else
141ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
142ECB_HEADER_INLINE uint32_t
143ecb_bswap32 (uint32_t x)
144{
145 return (x >> 24)
146 | ((x >> 8) & 0x0000ff00)
147 | ((x << 8) & 0x00ff0000)
148 | (x << 24);
149}
150#endif
151
152#if ECB_GCC_VERSION(4,5)
153# define ecb_unreachable() __builtin_unreachable ()
154#else
155/* this seems to work fine, but gcc always emits a warning for it :/ */
156ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
157ECB_HEADER_INLINE void ecb_unreachable (void) { }
158#endif
159
160ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; 193ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
161ECB_HEADER_INLINE unsigned char 194ecb_function_ unsigned char
162ecb_byteorder_helper () 195ecb_byteorder_helper (void)
163{ 196{
164 const uint32_t u = 0x11223344; 197 const uint32_t u = 0x11223344;
165 return *(unsigned char *)&u; 198 return *(unsigned char *)&u;
166} 199}
167 200
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 201ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
169ECB_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; }
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 203ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
171ECB_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
172 211
173#if ecb_cplusplus_does_not_suck 212#if ecb_cplusplus_does_not_suck
174// 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) */
175template<typename T, int N> 214 template<typename T, int N>
176static inline int ecb_array_length (const T (&arr)[N]) 215 static inline int ecb_array_length (const T (&arr)[N])
177{ 216 {
178 return N; 217 return N;
179} 218 }
180#else 219#else
181#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 220 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
182#endif 221#endif
183 222
184ECB_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;
185ECB_INLINE uint32_t 224ECB_INLINE uint32_t
186ecb_rotr32 (uint32_t x, unsigned int count) 225ecb_rotr32 (uint32_t x, unsigned int count)

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