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Comparing libecb/ecb.h (file contents):
Revision 1.11 by root, Thu May 26 18:00:42 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 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
… …
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33#include <inttypes.h> 33#include <inttypes.h>
34 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
35#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
36 49
37#ifndef __cplusplus 50#ifndef __cplusplus
38# if __STDC_VERSION__ >= 199901L 51# if __STDC_VERSION__ >= 199901L
39# define ECB_INLINE inline 52# define ECB_INLINE inline
40typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
… …
51 64
52#define ECB_HEADER_INLINE static ECB_INLINE 65#define ECB_HEADER_INLINE static ECB_INLINE
53 66
54#if ECB_GCC_VERSION(3,1) 67#if ECB_GCC_VERSION(3,1)
55# define ecb_attribute(attrlist) __attribute__(attrlist) 68# define ecb_attribute(attrlist) __attribute__(attrlist)
56# define ecb_is_constant(c) __builtin_constant_p (c) 69# define ecb_is_constant(expr) __builtin_constant_p (expr)
57# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 70# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
58# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 71# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
59#else 72#else
60# define ecb_attribute(attrlist) 73# define ecb_attribute(attrlist)
61# define ecb_is_constant(c) 0 74# define ecb_is_constant(expr) 0
62# define ecb_expect(expr,value) (expr) 75# define ecb_expect(expr,value) (expr)
63# define ecb_prefetch(addr,rw,locality) 76# define ecb_prefetch(addr,rw,locality)
64#endif 77#endif
65 78
66/* no emulation for ecb_decltype */ 79/* no emulation for ecb_decltype */
… …
76#define ecb_const ecb_attribute ((const)) 89#define ecb_const ecb_attribute ((const))
77#define ecb_pure ecb_attribute ((pure)) 90#define ecb_pure ecb_attribute ((pure))
78#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 91#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
79#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 92#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
80 93
81#if ECB_GCC_VERSION(4,5)
82# define ecb_unreachable() __builtin_unreachable ()
83#else
84/* this seems to work fine, but gcc always emits a warning for it :/ */
85ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn));
86ECB_HEADER_INLINE void ecb_unreachable () { }
87#endif
88
89/* put into ifs if you are very sure that the expression */ 94/* put into if's if you are very sure that the expression */
90/* is mostly true or mosty false. note that these return */ 95/* is mostly true or mosty false. note that these return */
91/* booleans, not the expression. */ 96/* booleans, not the expression. */
92#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 97#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
93#define ecb_likely(expr) ecb_expect (!!(expr), 1) 98#define ecb_likely(expr) ecb_expect (!!(expr), 1)
94 99
95/* try to tell the compiler that some condition is definitely true */ 100/* try to tell the compiler that some condition is definitely true */
96#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 101#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
97 102
98/* count trailing zero bits and count # of one bits */ 103/* count trailing zero bits and count # of one bits */
99#if ECB_GCC_VERSION(3,4) 104#if ECB_GCC_VERSION(3,4)
100ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 105#define ecb_ctz32 (x) __builtin_ctz (x)
101ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 106#define ecb_popcount32 (x) __builtin_popcount (x)
102#else 107#else
108ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
103ECB_HEADER_INLINE 109ECB_HEADER_INLINE
104ecb_ctz32 (uint32_t x) ecb_const 110ecb_ctz32 (uint32_t x)
105{ 111{
106 int r = 0; 112 int r = 0;
107 113
108 x &= -x; /* this isolates the lowest bit */ 114 x &= -x; /* this isolates the lowest bit */
109 115
… …
114 if (x & 0xffff0000) r += 16; 120 if (x & 0xffff0000) r += 16;
115 121
116 return r; 122 return r;
117} 123}
118 124
125ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
119ECB_HEADER_INLINE 126ECB_HEADER_INLINE
120ecb_popcount32 (uint32_t x) ecb_const 127ecb_popcount32 (uint32_t x)
121{ 128{
122 x -= (x >> 1) & 0x55555555; 129 x -= (x >> 1) & 0x55555555;
123 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 130 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
124 x = ((x >> 4) + x) & 0x0f0f0f0f; 131 x = ((x >> 4) + x) & 0x0f0f0f0f;
125 x *= 0x01010101; 132 x *= 0x01010101;
126 133
127 return x >> 24; 134 return x >> 24;
128} 135}
129#endif 136#endif
130 137
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;
131ECB_HEADER_INLINE unsigned char 171ECB_HEADER_INLINE unsigned char
132ecb_byteorder_helper () ecb_const 172ecb_byteorder_helper (void)
133{ 173{
134 const uint32_t u = 0x11223344; 174 const uint32_t u = 0x11223344;
135 return *(unsigned char *)&u; 175 return *(unsigned char *)&u;
136} 176}
137 177
178ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
138ECB_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;
139ECB_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)))
140 184
141#if ecb_cplusplus_does_not_suck 185#if ecb_cplusplus_does_not_suck
142// 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)
143template<typename T, int N> 187template<typename T, int N>
144static inline int ecb_array_length (const T (&arr)[N]) 188static inline int ecb_array_length (const T (&arr)[N])
… …
147} 191}
148#else 192#else
149#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 193#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
150#endif 194#endif
151 195
196ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
152ECB_INLINE uint32_t 197ECB_INLINE uint32_t
153ecb_rotr32 (uint32_t x, unsigned int count) 198ecb_rotr32 (uint32_t x, unsigned int count)
154{ 199{
155 return (x << (32 - count)) | (x >> count); 200 return (x << (32 - count)) | (x >> count);
156} 201}
157 202
203ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
158ECB_INLINE uint32_t 204ECB_INLINE uint32_t
159ecb_rotl32 (uint32_t x, unsigned int count) 205ecb_rotl32 (uint32_t x, unsigned int count)
160{ 206{
161 return (x >> (32 - count)) | (x << count); 207 return (x >> (32 - count)) | (x << count);
162} 208}
163 209
164#if ECB_GCC_VERSION(4,3)
165# define ecb_bswap32(x) __builtin_bswap32 (x)
166#else
167ECB_GCC_VERSION uint32_t
168ecb_bswap32 (uint32_t x)
169{
170 return (x >> 24)
171 | ((x >> 8) & 0x0000ff00)
172 | ((x << 8) & 0x00ff0000)
173 | (x << 24);
174}
175#endif 210#endif
176 211
177#endif
178

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