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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 1.41 by root, Sat Jun 11 17:35:48 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)))
45#endif 47 #endif
48#endif
46 49
50#define ECB_C99 (__STDC_VERSION__ >= 199901L)
51
47#ifndef __cplusplus 52#if __cplusplus
48# if __STDC_VERSION__ >= 199901L
49# define ECB_INLINE inline 53 #define ECB_INLINE static inline
50typedef _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
51# else 58#else
52# 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
53typedef int ecb_bool; 70typedef int ecb_bool;
54# endif
55#endif
56 71
57#define ECB_CONCAT_(a, b) a ## b 72#define ECB_CONCAT_(a, b) a ## b
58#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 73#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
59#define ECB_STRINGIFY_(a) # a 74#define ECB_STRINGIFY_(a) # a
60#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 75#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
61 76
62#define ECB_HEADER_INLINE static ECB_INLINE 77#define ecb_function_ ECB_INLINE
63 78
64#if ECB_GCC_VERSION(3,1) 79#if ECB_GCC_VERSION(3,1)
65# define ecb_attribute(attrlist) __attribute__(attrlist) 80 #define ecb_attribute(attrlist) __attribute__(attrlist)
66# define ecb_is_constant(c) __builtin_constant_p (c) 81 #define ecb_is_constant(expr) __builtin_constant_p (expr)
67# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 82 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
68# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 83 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
69#else 84#else
70# define ecb_attribute(attrlist) 85 #define ecb_attribute(attrlist)
71# define ecb_is_constant(c) 0 86 #define ecb_is_constant(expr) 0
72# define ecb_expect(expr,value) (expr) 87 #define ecb_expect(expr,value) (expr)
73# define ecb_prefetch(addr,rw,locality) 88 #define ecb_prefetch(addr,rw,locality)
74#endif 89#endif
75 90
76/* no emulation for ecb_decltype */ 91/* no emulation for ecb_decltype */
77#if ECB_GCC_VERSION(4,5) 92#if ECB_GCC_VERSION(4,5)
78# define ecb_decltype(x) __decltype(x) 93 #define ecb_decltype(x) __decltype(x)
79#elif ECB_GCC_VERSION(3,0) 94#elif ECB_GCC_VERSION(3,0)
80# define ecb_decltype(x) typeof(x) 95 #define ecb_decltype(x) __typeof(x)
81#endif 96#endif
82 97
83#define ecb_noinline ecb_attribute ((noinline)) 98#define ecb_noinline ecb_attribute ((__noinline__))
84#define ecb_noreturn ecb_attribute ((noreturn)) 99#define ecb_noreturn ecb_attribute ((__noreturn__))
85#define ecb_unused ecb_attribute ((unused)) 100#define ecb_unused ecb_attribute ((__unused__))
86#define ecb_const ecb_attribute ((const)) 101#define ecb_const ecb_attribute ((__const__))
87#define ecb_pure ecb_attribute ((pure)) 102#define ecb_pure ecb_attribute ((__pure__))
88#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
89#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
90 103
91#if ECB_GCC_VERSION(4,5) 104#if ECB_GCC_VERSION(4,3)
92# define ecb_unreachable() __builtin_unreachable () 105 #define ecb_artificial ecb_attribute ((__artificial__))
106 #define ecb_hot ecb_attribute ((__hot__))
107 #define ecb_cold ecb_attribute ((__cold__))
93#else 108#else
94/* this seems to work fine, but gcc always emits a warning for it :/ */ 109 #define ecb_artificial
95ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 110 #define ecb_hot
96ECB_HEADER_INLINE void ecb_unreachable () { } 111 #define ecb_cold
97#endif 112#endif
98 113
99/* put into ifs if you are very sure that the expression */ 114/* put around conditional expressions if you are very sure that the */
100/* is mostly true or mosty false. note that these return */ 115/* expression is mostly true or mostly false. note that these return */
101/* booleans, not the expression. */ 116/* booleans, not the expression. */
102#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 */
103#define ecb_likely(expr) ecb_expect (!!(expr), 1) 120#define ecb_likely(expr) ecb_expect_true (expr)
104 121#define ecb_unlikely(expr) ecb_expect_false (expr)
105/* try to tell the compiler that some condition is definitely true */
106#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0)
107 122
108/* count trailing zero bits and count # of one bits */ 123/* count trailing zero bits and count # of one bits */
109#if ECB_GCC_VERSION(3,4) 124#if ECB_GCC_VERSION(3,4)
110ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 125 #define ecb_ctz32(x) __builtin_ctz (x)
111ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 126 #define ecb_popcount32(x) __builtin_popcount (x)
112#else 127#else
113ECB_HEADER_INLINE 128 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
129 ecb_function_ int
114ecb_ctz32 (uint32_t x) ecb_const 130 ecb_ctz32 (uint32_t x)
115{ 131 {
116 int r = 0; 132 int r = 0;
117 133
118 x &= -x; /* this isolates the lowest bit */ 134 x &= -x; /* this isolates the lowest bit */
119 135
120 if (x & 0xaaaaaaaa) r += 1; 136 if (x & 0xaaaaaaaa) r += 1;
121 if (x & 0xcccccccc) r += 2; 137 if (x & 0xcccccccc) r += 2;
122 if (x & 0xf0f0f0f0) r += 4; 138 if (x & 0xf0f0f0f0) r += 4;
123 if (x & 0xff00ff00) r += 8; 139 if (x & 0xff00ff00) r += 8;
124 if (x & 0xffff0000) r += 16; 140 if (x & 0xffff0000) r += 16;
125 141
126 return r; 142 return r;
127} 143 }
128 144
129ECB_HEADER_INLINE 145 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
146 ecb_function_ int
130ecb_popcount32 (uint32_t x) ecb_const 147 ecb_popcount32 (uint32_t x)
131{ 148 {
132 x -= (x >> 1) & 0x55555555; 149 x -= (x >> 1) & 0x55555555;
133 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 150 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
134 x = ((x >> 4) + x) & 0x0f0f0f0f; 151 x = ((x >> 4) + x) & 0x0f0f0f0f;
135 x *= 0x01010101; 152 x *= 0x01010101;
136 153
137 return x >> 24; 154 return x >> 24;
138} 155 }
139#endif 156#endif
140 157
141ECB_HEADER_INLINE unsigned char 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
189
190/* try to tell the compiler that some condition is definitely true */
191#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
192
193ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
194ecb_function_ unsigned char
142ecb_byteorder_helper () ecb_const 195ecb_byteorder_helper (void)
143{ 196{
144 const uint32_t u = 0x11223344; 197 const uint32_t u = 0x11223344;
145 return *(unsigned char *)&u; 198 return *(unsigned char *)&u;
146} 199}
147 200
201ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
148ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 202ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
203ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
149ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { 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
150 211
151#if ecb_cplusplus_does_not_suck 212#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) 213 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
153template<typename T, int N> 214 template<typename T, int N>
154static inline int ecb_array_length (const T (&arr)[N]) 215 static inline int ecb_array_length (const T (&arr)[N])
155{ 216 {
156 return N; 217 return N;
157} 218 }
158#else 219#else
159#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 220 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
160#endif 221#endif
161 222
223ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
162ECB_INLINE uint32_t 224ECB_INLINE uint32_t
163ecb_rotr32 (uint32_t x, unsigned int count) 225ecb_rotr32 (uint32_t x, unsigned int count)
164{ 226{
165 return (x << (32 - count)) | (x >> count); 227 return (x << (32 - count)) | (x >> count);
166} 228}
167 229
230ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
168ECB_INLINE uint32_t 231ECB_INLINE uint32_t
169ecb_rotl32 (uint32_t x, unsigned int count) 232ecb_rotl32 (uint32_t x, unsigned int count)
170{ 233{
171 return (x >> (32 - count)) | (x << count); 234 return (x >> (32 - count)) | (x << count);
172} 235}
173 236
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 237#endif
186 238
187#endif
188

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