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Comparing libecb/ecb.h (file contents):
Revision 1.1 by root, Thu May 26 16:41:12 2011 UTC vs.
Revision 1.46 by root, Fri Jun 17 15:17:26 2011 UTC

1/* 1/*
2 * libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (c) 2011 Marc Alexander Lehmann 4 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta
5 * All rights reserved. 6 * All rights reserved.
6 * 7 *
7 * 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-
8 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
9 * 10 *
… …
27 */ 28 */
28 29
29#ifndef ECB_H 30#ifndef ECB_H
30#define ECB_H 31#define ECB_H
31 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
48 #include <inttypes.h>
49#endif
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(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
60 #define ECB_GCC_VERSION(major,minor) 0
61 #else
32#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
65
66#define ECB_C99 (__STDC_VERSION__ >= 199901L)
67
68#if __cplusplus
69 #define ecb_inline static inline
70#elif ECB_GCC_VERSION(2,5)
71 #define ecb_inline static __inline__
72#elif ECB_C99
73 #define ecb_inline static inline
74#else
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
86typedef int ecb_bool;
87
88#define ECB_CONCAT_(a, b) a ## b
89#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
90#define ECB_STRINGIFY_(a) # a
91#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
92
93#define ecb_function_ ecb_inline
33 94
34#if ECB_GCC_VERSION(3,1) 95#if ECB_GCC_VERSION(3,1)
35# define ecb_attribute(attrlist) __attribute__(attrlist) 96 #define ecb_attribute(attrlist) __attribute__(attrlist)
36# define ecb_is_constant(c) __builtin_constant_p (c) 97 #define ecb_is_constant(expr) __builtin_constant_p (expr)
37# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 98 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
38# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 99 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
39#else 100#else
40# define ecb_attribute(attrlist) 101 #define ecb_attribute(attrlist)
41# define ecb_is_constant(c) 0 102 #define ecb_is_constant(expr) 0
42# define ecb_expect(expr,value) (expr) 103 #define ecb_expect(expr,value) (expr)
43# define ecb_prefetch(addr,rw,locality) 104 #define ecb_prefetch(addr,rw,locality)
44#endif 105#endif
45 106
107/* no emulation for ecb_decltype */
46#if ECB_GCC_VERSION(4,5) 108#if ECB_GCC_VERSION(4,5)
47# define ecb_decltype(x) __decltype(x) 109 #define ecb_decltype(x) __decltype(x)
48#elif ECB_GCC_VERSION(3,0) 110#elif ECB_GCC_VERSION(3,0)
49# define ecb_decltype(x) typeof(x) 111 #define ecb_decltype(x) __typeof(x)
50#endif 112#endif
51 113
52#define ecb_noinline ecb_attribute ((noinline)) 114#define ecb_noinline ecb_attribute ((__noinline__))
53#define ecb_noreturn ecb_attribute ((noreturn)) 115#define ecb_noreturn ecb_attribute ((__noreturn__))
54#define ecb_unused ecb_attribute ((unused)) 116#define ecb_unused ecb_attribute ((__unused__))
55#define ecb_const ecb_attribute ((const)) 117#define ecb_const ecb_attribute ((__const__))
56#define ecb_pure ecb_attribute ((pure)) 118#define ecb_pure ecb_attribute ((__pure__))
119
120#if ECB_GCC_VERSION(4,3)
121 #define ecb_artificial ecb_attribute ((__artificial__))
57#define ecb_hot ecb_attribute ((hot)) // 4.3 122 #define ecb_hot ecb_attribute ((__hot__))
58#define ecb_cold ecb_attribute ((cold)) // 4.3 123 #define ecb_cold ecb_attribute ((__cold__))
124#else
125 #define ecb_artificial
126 #define ecb_hot
127 #define ecb_cold
128#endif
129
130/* put around conditional expressions if you are very sure that the */
131/* expression is mostly true or mostly false. note that these return */
132/* booleans, not the expression. */
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 */
136#define ecb_likely(expr) ecb_expect_true (expr)
137#define ecb_unlikely(expr) ecb_expect_false (expr)
138
139/* count trailing zero bits and count # of one bits */
140#if ECB_GCC_VERSION(3,4)
141 #define ecb_ctz32(x) __builtin_ctz (x)
142 #define ecb_popcount32(x) __builtin_popcount (x)
143#else
144 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
145 ecb_function_ int
146 ecb_ctz32 (uint32_t x)
147 {
148 int r = 0;
149
150 x &= (uint32_t)-(int32_t)x; /* this isolates the lowest bit */
151
152 if (x & 0xaaaaaaaa) r += 1;
153 if (x & 0xcccccccc) r += 2;
154 if (x & 0xf0f0f0f0) r += 4;
155 if (x & 0xff00ff00) r += 8;
156 if (x & 0xffff0000) r += 16;
157
158 return r;
159 }
160
161 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
162 ecb_function_ int
163 ecb_popcount32 (uint32_t x)
164 {
165 x -= (x >> 1) & 0x55555555;
166 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
167 x = ((x >> 4) + x) & 0x0f0f0f0f;
168 x *= 0x01010101;
169
170 return x >> 24;
171 }
172#endif
173
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
59 197
60#if ECB_GCC_VERSION(4,5) 198#if ECB_GCC_VERSION(4,5)
61# define ecb_unreachable() __builtin_unreachable () 199 #define ecb_unreachable() __builtin_unreachable ()
62#else 200#else
63 // this seems to work fine, but gcc always emits a warning for it :/ 201 /* this seems to work fine, but gcc always emits a warning for it :/ */
64 static inline void ecb_unreachable () ecb_attribute ((noreturn)); 202 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
65 static inline void ecb_unreachable () { } 203 ecb_function_ void ecb_unreachable (void) { }
66#endif 204#endif
67 205
68// put into ifs if you are very sure that the expression
69// is mostly true or mosty false. note that these return
70// booleans, not the expression.
71#define ecb_expect_false(expr) ecb_expect ((expr) ? 1 : 0, 0)
72#define ecb_expect_true(expr) ecb_expect ((expr) ? 1 : 0, 1)
73
74// try to tell the compiler that some condition is definitely true 206/* try to tell the compiler that some condition is definitely true */
75#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 207#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
76 208
77// count trailing zero bits and count # of one bits 209ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
78#if ECB_GCC_VERSION(3,4) 210ecb_function_ unsigned char
79static inline int ecb_ctz (unsigned int x) { return __builtin_ctz (x); } 211ecb_byteorder_helper (void)
80static inline int ecb_popcount (unsigned int x) { return __builtin_popcount (x); }
81#else
82static int ecb_ctz (unsigned int x) ecb_const
83{ 212{
84 int r = 0; 213 const uint32_t u = 0x11223344;
85 214 return *(unsigned char *)&u;
86 x &= -x; // this isolates the lowest bit
87
88 if (x & 0xaaaaaaaa) r += 1;
89 if (x & 0xcccccccc) r += 2;
90 if (x & 0xf0f0f0f0) r += 4;
91 if (x & 0xff00ff00) r += 8;
92 if (x & 0xffff0000) r += 16;
93
94 return r;
95} 215}
96 216
97static int ecb_popcount (unsigned int x) ecb_const 217ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
218ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
219ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
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
227
228#if ecb_cplusplus_does_not_suck
229 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
230 template<typename T, int N>
231 static inline int ecb_array_length (const T (&arr)[N])
232 {
233 return N;
234 }
235#else
236 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
237#endif
238
239ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
240ecb_inline uint32_t
241ecb_rotr32 (uint32_t x, unsigned int count)
98{ 242{
99 x -= (x >> 1) & 0x55555555; 243 return (x << (32 - count)) | (x >> count);
100 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
101 x = ((x >> 4) + x) & 0x0f0f0f0f;
102 x *= 0x01010101;
103
104 return x >> 24;
105} 244}
106#endif
107 245
108#endif 246ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
247ecb_inline uint32_t
248ecb_rotl32 (uint32_t x, unsigned int count)
249{
250 return (x >> (32 - count)) | (x << count);
251}
109 252
253#endif
254

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