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Comparing libecb/ecb.h (file contents):
Revision 1.6 by root, Thu May 26 17:35:47 2011 UTC vs.
Revision 1.23 by root, Thu May 26 19:40:09 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
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 *
… …
29#ifndef ECB_H 30#ifndef ECB_H
30#define ECB_H 31#define ECB_H
31 32
32#include <inttypes.h> 33#include <inttypes.h>
33 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
34#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
35 49
36#ifndef __cplusplus 50#ifndef __cplusplus
37# if __STDC_VERSION__ >= 199901L 51# if __STDC_VERSION__ >= 199901L
38# define ECB_INLINE inline 52# define ECB_INLINE inline
39typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
… …
41# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE inline /* yeah! */
42typedef int ecb_bool; 56typedef int ecb_bool;
43# endif 57# endif
44#endif 58#endif
45 59
60#define ECB_CONCAT_(a, b) a ## b
61#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
62#define ECB_STRINGIFY_(a) # a
63#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
64
46#define ECB_HEADER_INLINE static ECB_INLINE 65#define ECB_HEADER_INLINE static ECB_INLINE
47 66
48#if ECB_GCC_VERSION(3,1) 67#if ECB_GCC_VERSION(3,1)
49# define ecb_attribute(attrlist) __attribute__(attrlist) 68# define ecb_attribute(attrlist) __attribute__(attrlist)
50# define ecb_is_constant(c) __builtin_constant_p (c) 69# define ecb_is_constant(expr) __builtin_constant_p (expr)
51# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 70# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
52# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 71# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
53#else 72#else
54# define ecb_attribute(attrlist) 73# define ecb_attribute(attrlist)
55# define ecb_is_constant(c) 0 74# define ecb_is_constant(expr) 0
56# define ecb_expect(expr,value) (expr) 75# define ecb_expect(expr,value) (expr)
57# define ecb_prefetch(addr,rw,locality) 76# define ecb_prefetch(addr,rw,locality)
58#endif 77#endif
59 78
60/* no emulation for ecb_decltype */ 79/* no emulation for ecb_decltype */
… …
70#define ecb_const ecb_attribute ((const)) 89#define ecb_const ecb_attribute ((const))
71#define ecb_pure ecb_attribute ((pure)) 90#define ecb_pure ecb_attribute ((pure))
72#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 91#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
73#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 92#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
74 93
75#if ECB_GCC_VERSION(4,5)
76# define ecb_unreachable() __builtin_unreachable ()
77#else
78/* this seems to work fine, but gcc always emits a warning for it :/ */
79ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn));
80ECB_HEADER_INLINE void ecb_unreachable () { }
81#endif
82
83/* put into ifs if you are very sure that the expression */ 94/* put into if's if you are very sure that the expression */
84/* is mostly true or mosty false. note that these return */ 95/* is mostly true or mosty false. note that these return */
85/* booleans, not the expression. */ 96/* booleans, not the expression. */
86#define ecb_unlikely(expr) ecb_expect ((expr) ? 1 : 0, 0) 97#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
87#define ecb_likely(expr) ecb_expect ((expr) ? 1 : 0, 1) 98#define ecb_likely(expr) ecb_expect (!!(expr), 1)
88 99
89/* try to tell the compiler that some condition is definitely true */ 100/* try to tell the compiler that some condition is definitely true */
90#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 101#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
91 102
92/* count trailing zero bits and count # of one bits */ 103/* count trailing zero bits and count # of one bits */
93#if ECB_GCC_VERSION(3,4) 104#if ECB_GCC_VERSION(3,4)
94ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 105#define ecb_ctz32 (x) __builtin_ctz (x)
95ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 106#define ecb_popcount32 (x) __builtin_popcount (x)
96#else 107#else
108ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
97ECB_HEADER_INLINE 109ECB_HEADER_INLINE
98ecb_ctz32 (uint32_t x) ecb_const 110ecb_ctz32 (uint32_t x)
99{ 111{
100 int r = 0; 112 int r = 0;
101 113
102 x &= -x; /* this isolates the lowest bit */ 114 x &= -x; /* this isolates the lowest bit */
103 115
… …
108 if (x & 0xffff0000) r += 16; 120 if (x & 0xffff0000) r += 16;
109 121
110 return r; 122 return r;
111} 123}
112 124
125ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
113ECB_HEADER_INLINE 126ECB_HEADER_INLINE
114ecb_popcount32 (uint32_t x) ecb_const 127ecb_popcount32 (uint32_t x)
115{ 128{
116 x -= (x >> 1) & 0x55555555; 129 x -= (x >> 1) & 0x55555555;
117 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 130 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
118 x = ((x >> 4) + x) & 0x0f0f0f0f; 131 x = ((x >> 4) + x) & 0x0f0f0f0f;
119 x *= 0x01010101; 132 x *= 0x01010101;
120 133
121 return x >> 24; 134 return x >> 24;
122} 135}
123#endif 136#endif
124 137
138#if ECB_GCC_VERSION(4,3)
139# define ecb_bswap32(x) __builtin_bswap32 (x)
140# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
141#else
142ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
143ECB_HEADER_INLINE uint32_t
144ecb_bswap32 (uint32_t x)
145{
146 return (x >> 24)
147 | ((x >> 8) & 0x0000ff00)
148 | ((x << 8) & 0x00ff0000)
149 | (x << 24);
150}
151
152ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
153ECB_HEADER_INLINE uint32_t
154ecb_bswap16 (uint32_t x)
155{
156 return ((x >> 8) & 0xff)
157 | ((x << 8) & 0x00ff0000)
158 | (x << 24);
159}
160#endif
161
162#if ECB_GCC_VERSION(4,5)
163# define ecb_unreachable() __builtin_unreachable ()
164#else
165/* this seems to work fine, but gcc always emits a warning for it :/ */
166ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
167ECB_HEADER_INLINE void ecb_unreachable (void) { }
168#endif
169
170ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
125ECB_HEADER_INLINE unsigned char 171ECB_HEADER_INLINE unsigned char
126ecb_byteorder_helper () ecb_const 172ecb_byteorder_helper (void)
127{ 173{
128 const uint32_t u = 0x11223344; 174 const uint32_t u = 0x11223344;
129 return *(unsigned char *)&u; 175 return *(unsigned char *)&u;
130} 176}
131 177
178ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
132ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 179ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
180ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
133ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 181ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
182
183#define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n)))
134 184
135#if ecb_cplusplus_does_not_suck 185#if ecb_cplusplus_does_not_suck
136// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 186// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
137template<typename T, int N> 187template<typename T, int N>
138static inline int array_length (const T (&arr)[N]) 188static inline int ecb_array_length (const T (&arr)[N])
139{ 189{
140 return N; 190 return N;
141} 191}
142#else 192#else
143#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 193#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
144#endif 194#endif
145 195
196ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
146ECB_INLINE uint32_t 197ECB_INLINE uint32_t
147ecb_rotate32_right (uint32_t c, unsigned int count = 1) 198ecb_rotr32 (uint32_t x, unsigned int count)
148{ 199{
149 return (c << (32 - count)) | (c >> count); 200 return (x << (32 - count)) | (x >> count);
150} 201}
151 202
203ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
152ECB_INLINE uint32_t 204ECB_INLINE uint32_t
153ecb_rotate32_left (uint32_t c, unsigned int count = 1) 205ecb_rotl32 (uint32_t x, unsigned int count)
154{ 206{
155 return (c >> (32 - count)) | (c << count); 207 return (x >> (32 - count)) | (x << count);
156} 208}
157 209
158#endif 210#endif
159 211

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