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Revision: 1.44
Committed: Mon Jun 13 08:19:29 2011 UTC (13 years ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.43: +17 -1 lines
Log Message:
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File Contents

# User Rev Content
1 root 1.1 /*
2 root 1.17 * libecb - http://software.schmorp.de/pkg/libecb
3 root 1.1 *
4 root 1.30 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
5 root 1.7 * Copyright (©) 2011 Emanuele Giaquinta
6 root 1.1 * All rights reserved.
7     *
8     * Redistribution and use in source and binary forms, with or without modifica-
9     * tion, are permitted provided that the following conditions are met:
10     *
11     * 1. Redistributions of source code must retain the above copyright notice,
12     * this list of conditions and the following disclaimer.
13     *
14     * 2. Redistributions in binary form must reproduce the above copyright
15     * notice, this list of conditions and the following disclaimer in the
16     * documentation and/or other materials provided with the distribution.
17     *
18     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20     * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21     * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22     * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26     * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27     * OF THE POSSIBILITY OF SUCH DAMAGE.
28     */
29    
30     #ifndef ECB_H
31     #define ECB_H
32    
33 root 1.44 #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 root 1.6
51 root 1.12 /* many compilers define _GNUC_ to some versions but then only implement
52     * what their idiot authors think are the "more important" extensions,
53 root 1.18 * causing enourmous grief in return for some better fake benchmark numbers.
54     * or so.
55 root 1.12 * 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 root 1.14 #ifndef ECB_GCC_VERSION
59 root 1.43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
60 root 1.37 #define ECB_GCC_VERSION(major,minor) 0
61     #else
62     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63     #endif
64 root 1.12 #endif
65 root 1.1
66 root 1.39 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
67    
68     #if __cplusplus
69 root 1.38 #define ECB_INLINE static inline
70     #elif ECB_GCC_VERSION(2,5)
71     #define ECB_INLINE static __inline__
72 root 1.39 #elif ECB_C99
73 root 1.38 #define ECB_INLINE static inline
74 root 1.29 #else
75 root 1.38 #define ECB_INLINE static
76     #endif
77    
78     #if ECB_GCC_VERSION(3,3)
79     #define ecb_restrict __restrict__
80 root 1.39 #elif ECB_C99
81 root 1.38 #define ecb_restrict restrict
82     #else
83     #define ecb_restrict
84 root 1.4 #endif
85    
86 root 1.38 typedef int ecb_bool;
87    
88 root 1.8 #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 root 1.39 #define ecb_function_ ECB_INLINE
94 root 1.3
95 root 1.1 #if ECB_GCC_VERSION(3,1)
96 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
97     #define ecb_is_constant(expr) __builtin_constant_p (expr)
98     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
99     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
100     #else
101     #define ecb_attribute(attrlist)
102     #define ecb_is_constant(expr) 0
103     #define ecb_expect(expr,value) (expr)
104     #define ecb_prefetch(addr,rw,locality)
105 root 1.1 #endif
106    
107 root 1.2 /* no emulation for ecb_decltype */
108 root 1.1 #if ECB_GCC_VERSION(4,5)
109 root 1.37 #define ecb_decltype(x) __decltype(x)
110 root 1.1 #elif ECB_GCC_VERSION(3,0)
111 root 1.39 #define ecb_decltype(x) __typeof(x)
112 root 1.1 #endif
113    
114 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
115     #define ecb_noreturn ecb_attribute ((__noreturn__))
116     #define ecb_unused ecb_attribute ((__unused__))
117     #define ecb_const ecb_attribute ((__const__))
118     #define ecb_pure ecb_attribute ((__pure__))
119 root 1.35
120     #if ECB_GCC_VERSION(4,3)
121 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
122     #define ecb_hot ecb_attribute ((__hot__))
123     #define ecb_cold ecb_attribute ((__cold__))
124 root 1.35 #else
125     #define ecb_artificial
126     #define ecb_hot
127     #define ecb_cold
128     #endif
129 root 1.1
130 root 1.39 /* 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 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
134     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
135 root 1.36 /* for compatibility to the rest of the world */
136 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
137     #define ecb_unlikely(expr) ecb_expect_false (expr)
138 root 1.1
139 root 1.3 /* count trailing zero bits and count # of one bits */
140 root 1.1 #if ECB_GCC_VERSION(3,4)
141 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
142     #define ecb_popcount32(x) __builtin_popcount (x)
143 root 1.1 #else
144 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
145     ecb_function_ int
146 root 1.35 ecb_ctz32 (uint32_t x)
147     {
148     int r = 0;
149    
150     x &= -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 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
162     ecb_function_ int
163 root 1.35 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 root 1.1
170 root 1.35 return x >> 24;
171     }
172 root 1.1 #endif
173    
174 root 1.13 #if ECB_GCC_VERSION(4,3)
175 root 1.35 #define ecb_bswap32(x) __builtin_bswap32 (x)
176     #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
177 root 1.13 #else
178 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
179     ecb_function_ uint32_t
180 root 1.35 ecb_bswap32 (uint32_t x)
181     {
182     return (x >> 24)
183     | ((x >> 8) & 0x0000ff00)
184     | ((x << 8) & 0x00ff0000)
185     | (x << 24);
186     }
187    
188 root 1.39 ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const;
189     ecb_function_ uint32_t
190 root 1.35 ecb_bswap16 (uint32_t x)
191     {
192     return ((x >> 8) & 0xff)
193     | ((x << 8) & 0x00ff0000)
194     | (x << 24);
195     }
196 root 1.13 #endif
197    
198     #if ECB_GCC_VERSION(4,5)
199 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
200 root 1.13 #else
201 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
202 root 1.39 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
203     ecb_function_ void ecb_unreachable (void) { }
204 root 1.13 #endif
205    
206 root 1.41 /* try to tell the compiler that some condition is definitely true */
207     #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
208    
209 root 1.39 ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
210     ecb_function_ unsigned char
211 root 1.23 ecb_byteorder_helper (void)
212 root 1.3 {
213     const uint32_t u = 0x11223344;
214     return *(unsigned char *)&u;
215     }
216    
217 root 1.39 ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
218 root 1.42 ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
219 root 1.39 ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
220 root 1.42 ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
221 root 1.3
222 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
223 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
224 root 1.31 #else
225 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
226 root 1.31 #endif
227 root 1.21
228 root 1.5 #if ecb_cplusplus_does_not_suck
229 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
230 root 1.35 template<typename T, int N>
231     static inline int ecb_array_length (const T (&arr)[N])
232     {
233     return N;
234     }
235 root 1.5 #else
236 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
237 root 1.5 #endif
238    
239 root 1.14 ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
240 root 1.6 ECB_INLINE uint32_t
241 root 1.9 ecb_rotr32 (uint32_t x, unsigned int count)
242 root 1.6 {
243 root 1.9 return (x << (32 - count)) | (x >> count);
244 root 1.6 }
245    
246 root 1.14 ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
247 root 1.6 ECB_INLINE uint32_t
248 root 1.9 ecb_rotl32 (uint32_t x, unsigned int count)
249 root 1.6 {
250 root 1.9 return (x >> (32 - count)) | (x << count);
251 root 1.6 }
252    
253 root 1.1 #endif
254