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Comparing libecb/ecb.h (file contents):
Revision 1.4 by root, Thu May 26 17:26:03 2011 UTC vs.
Revision 1.35 by root, Sat Jun 11 13:25:25 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 * 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#include <inttypes.h>
34
35/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers.
38 * or so.
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.
41 */
42#ifndef ECB_GCC_VERSION
43# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
44# define ECB_GCC_VERSION(major,minor) 0
45# else
32#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
48#endif
33 49
34#ifndef __cplusplus 50#ifndef __cplusplus
35# if __STDC_VERSION__ >= 199901L 51# if __STDC_VERSION__ >= 199901L
36# define ECB_INLINE inline 52# define ECB_INLINE static inline
37typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
38# else 54# else
39# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE static inline /* yeah! */
40typedef int ecb_bool; 56typedef int ecb_bool;
41# endif 57# endif
58#else
59# define ECB_INLINE static inline
60typedef bool ecb_bool;
42#endif 61#endif
43 62
63#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67
44#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE ECB_INLINE
45 69
46#if ECB_GCC_VERSION(3,1) 70#if ECB_GCC_VERSION(3,1)
47# define ecb_attribute(attrlist) __attribute__(attrlist) 71# define ecb_attribute(attrlist) __attribute__(attrlist)
48# define ecb_is_constant(c) __builtin_constant_p (c) 72# define ecb_is_constant(expr) __builtin_constant_p (expr)
49# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 73# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
50# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 74# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
51#else 75#else
52# define ecb_attribute(attrlist) 76# define ecb_attribute(attrlist)
53# define ecb_is_constant(c) 0 77# define ecb_is_constant(expr) 0
54# define ecb_expect(expr,value) (expr) 78# define ecb_expect(expr,value) (expr)
55# define ecb_prefetch(addr,rw,locality) 79# define ecb_prefetch(addr,rw,locality)
56#endif 80#endif
57 81
58/* no emulation for ecb_decltype */ 82/* no emulation for ecb_decltype */
… …
60# define ecb_decltype(x) __decltype(x) 84# define ecb_decltype(x) __decltype(x)
61#elif ECB_GCC_VERSION(3,0) 85#elif ECB_GCC_VERSION(3,0)
62# define ecb_decltype(x) typeof(x) 86# define ecb_decltype(x) typeof(x)
63#endif 87#endif
64 88
65#define ecb_noinline ecb_attribute ((noinline)) 89#define ecb_noinline ecb_attribute ((__noinline__))
66#define ecb_noreturn ecb_attribute ((noreturn)) 90#define ecb_noreturn ecb_attribute ((__noreturn__))
67#define ecb_unused ecb_attribute ((unused)) 91#define ecb_unused ecb_attribute ((__unused__))
68#define ecb_const ecb_attribute ((const)) 92#define ecb_const ecb_attribute ((__const__))
69#define ecb_pure ecb_attribute ((pure)) 93#define ecb_pure ecb_attribute ((__pure__))
70#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
71#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
72 94
73#if ECB_GCC_VERSION(4,5) 95#if ECB_GCC_VERSION(4,3)
74# define ecb_unreachable() __builtin_unreachable () 96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
75#else 99#else
76/* this seems to work fine, but gcc always emits a warning for it :/ */ 100 #define ecb_artificial
77ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 101 #define ecb_hot
78ECB_HEADER_INLINE void ecb_unreachable () { } 102 #define ecb_cold
79#endif 103#endif
80 104
81/* put into ifs if you are very sure that the expression */ 105/* put into if's if you are very sure that the expression */
82/* is mostly true or mosty false. note that these return */ 106/* is mostly true or mostly false. note that these return */
83/* booleans, not the expression. */ 107/* booleans, not the expression. */
84#define ecb_expect_false(expr) ecb_expect ((expr) ? 1 : 0, 0) 108#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
85#define ecb_expect_true(expr) ecb_expect ((expr) ? 1 : 0, 1) 109#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
110#define ecb_likely(expr) ecb_expect_true (expr)
111#define ecb_unlikely(expr) ecb_expect_false (expr)
86 112
87/* try to tell the compiler that some condition is definitely true */ 113/* try to tell the compiler that some condition is definitely true */
88#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 114#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
89 115
90/* count trailing zero bits and count # of one bits */ 116/* count trailing zero bits and count # of one bits */
91#if ECB_GCC_VERSION(3,4) 117#if ECB_GCC_VERSION(3,4)
92ECB_HEADER_INLINE int ecb_ctz32 (unsigned int x) { return __builtin_ctz (x); } 118 #define ecb_ctz32(x) __builtin_ctz (x)
93ECB_HEADER_INLINE int ecb_popcount32 (unsigned int x) { return __builtin_popcount (x); } 119 #define ecb_popcount32(x) __builtin_popcount (x)
94#else 120#else
121 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
95ECB_HEADER_INLINE 122 ECB_HEADER_INLINE int
96ecb_ctz32 (unsigned int x) ecb_const 123 ecb_ctz32 (uint32_t x)
97{ 124 {
98 int r = 0; 125 int r = 0;
99 126
100 x &= -x; /* this isolates the lowest bit */ 127 x &= -x; /* this isolates the lowest bit */
101 128
102 if (x & 0xaaaaaaaa) r += 1; 129 if (x & 0xaaaaaaaa) r += 1;
103 if (x & 0xcccccccc) r += 2; 130 if (x & 0xcccccccc) r += 2;
104 if (x & 0xf0f0f0f0) r += 4; 131 if (x & 0xf0f0f0f0) r += 4;
105 if (x & 0xff00ff00) r += 8; 132 if (x & 0xff00ff00) r += 8;
106 if (x & 0xffff0000) r += 16; 133 if (x & 0xffff0000) r += 16;
107 134
108 return r; 135 return r;
109} 136 }
110 137
138 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
111ECB_HEADER_INLINE 139 ECB_HEADER_INLINE int
112ecb_popcount32 (unsigned int x) ecb_const 140 ecb_popcount32 (uint32_t x)
113{ 141 {
114 x -= (x >> 1) & 0x55555555; 142 x -= (x >> 1) & 0x55555555;
115 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 143 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
116 x = ((x >> 4) + x) & 0x0f0f0f0f; 144 x = ((x >> 4) + x) & 0x0f0f0f0f;
117 x *= 0x01010101; 145 x *= 0x01010101;
118 146
119 return x >> 24; 147 return x >> 24;
120} 148 }
121#endif 149#endif
122 150
151#if ECB_GCC_VERSION(4,3)
152 #define ecb_bswap32(x) __builtin_bswap32 (x)
153 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
154#else
155 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
156 ECB_HEADER_INLINE uint32_t
157 ecb_bswap32 (uint32_t x)
158 {
159 return (x >> 24)
160 | ((x >> 8) & 0x0000ff00)
161 | ((x << 8) & 0x00ff0000)
162 | (x << 24);
163 }
164
165 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
166 ECB_HEADER_INLINE uint32_t
167 ecb_bswap16 (uint32_t x)
168 {
169 return ((x >> 8) & 0xff)
170 | ((x << 8) & 0x00ff0000)
171 | (x << 24);
172 }
173#endif
174
175#if ECB_GCC_VERSION(4,5)
176 #define ecb_unreachable() __builtin_unreachable ()
177#else
178 /* this seems to work fine, but gcc always emits a warning for it :/ */
179 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
180 ECB_HEADER_INLINE void ecb_unreachable (void) { }
181#endif
182
183ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
123ECB_HEADER_INLINE unsigned char 184ECB_HEADER_INLINE unsigned char
124ecb_byteorder_helper () ecb_const 185ecb_byteorder_helper (void)
125{ 186{
126 const uint32_t u = 0x11223344; 187 const uint32_t u = 0x11223344;
127 return *(unsigned char *)&u; 188 return *(unsigned char *)&u;
128} 189}
129 190
191ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
130ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
193ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
131ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
132 195
196#if ECB_GCC_VERSION(3,0)
197 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
198#else
199 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
133#endif 200#endif
134 201
202#if ecb_cplusplus_does_not_suck
203 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
204 template<typename T, int N>
205 static inline int ecb_array_length (const T (&arr)[N])
206 {
207 return N;
208 }
209#else
210 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
211#endif
212
213ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
214ECB_INLINE uint32_t
215ecb_rotr32 (uint32_t x, unsigned int count)
216{
217 return (x << (32 - count)) | (x >> count);
218}
219
220ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
221ECB_INLINE uint32_t
222ecb_rotl32 (uint32_t x, unsigned int count)
223{
224 return (x >> (32 - count)) | (x << count);
225}
226
227#endif
228

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