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Comparing libecb/ecb.h (file contents):
Revision 1.21 by root, Thu May 26 19:23:53 2011 UTC vs.
Revision 1.46 by root, Fri Jun 17 15:17:26 2011 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/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 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * 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-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
28 */ 28 */
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 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
33#include <inttypes.h> 48 #include <inttypes.h>
49#endif
34 50
35/* many compilers define _GNUC_ to some versions but then only implement 51/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions, 52 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers. 53 * causing enourmous grief in return for some better fake benchmark numbers.
38 * or so. 54 * or so.
39 * we try to detect these and simply assume they are not gcc - if they have 55 * 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. 56 * an issue with that they should have done it right in the first place.
41 */ 57 */
42#ifndef ECB_GCC_VERSION 58#ifndef ECB_GCC_VERSION
43# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 59 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
44# define ECB_GCC_VERSION(major,minor) 0 60 #define ECB_GCC_VERSION(major,minor) 0
45# else 61 #else
46# 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
47# endif 64#endif
48#endif
49 65
66#define ECB_C99 (__STDC_VERSION__ >= 199901L)
67
50#ifndef __cplusplus 68#if __cplusplus
51# if __STDC_VERSION__ >= 199901L 69 #define ecb_inline static inline
52# define ECB_INLINE inline 70#elif ECB_GCC_VERSION(2,5)
53typedef _Bool ecb_bool; 71 #define ecb_inline static __inline__
72#elif ECB_C99
73 #define ecb_inline static inline
54# else 74#else
55# define ECB_INLINE inline /* yeah! */ 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
56typedef int ecb_bool; 86typedef int ecb_bool;
57# endif
58#endif
59 87
60#define ECB_CONCAT_(a, b) a ## b 88#define ECB_CONCAT_(a, b) a ## b
61#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 89#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
62#define ECB_STRINGIFY_(a) # a 90#define ECB_STRINGIFY_(a) # a
63#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 91#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
64 92
65#define ECB_HEADER_INLINE static ECB_INLINE 93#define ecb_function_ ecb_inline
66 94
67#if ECB_GCC_VERSION(3,1) 95#if ECB_GCC_VERSION(3,1)
68# define ecb_attribute(attrlist) __attribute__(attrlist) 96 #define ecb_attribute(attrlist) __attribute__(attrlist)
69# define ecb_is_constant(c) __builtin_constant_p (c) 97 #define ecb_is_constant(expr) __builtin_constant_p (expr)
70# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 98 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
71# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 99 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
72#else 100#else
73# define ecb_attribute(attrlist) 101 #define ecb_attribute(attrlist)
74# define ecb_is_constant(c) 0 102 #define ecb_is_constant(expr) 0
75# define ecb_expect(expr,value) (expr) 103 #define ecb_expect(expr,value) (expr)
76# define ecb_prefetch(addr,rw,locality) 104 #define ecb_prefetch(addr,rw,locality)
77#endif 105#endif
78 106
79/* no emulation for ecb_decltype */ 107/* no emulation for ecb_decltype */
80#if ECB_GCC_VERSION(4,5) 108#if ECB_GCC_VERSION(4,5)
81# define ecb_decltype(x) __decltype(x) 109 #define ecb_decltype(x) __decltype(x)
82#elif ECB_GCC_VERSION(3,0) 110#elif ECB_GCC_VERSION(3,0)
83# define ecb_decltype(x) typeof(x) 111 #define ecb_decltype(x) __typeof(x)
84#endif 112#endif
85 113
86#define ecb_noinline ecb_attribute ((noinline)) 114#define ecb_noinline ecb_attribute ((__noinline__))
87#define ecb_noreturn ecb_attribute ((noreturn)) 115#define ecb_noreturn ecb_attribute ((__noreturn__))
88#define ecb_unused ecb_attribute ((unused)) 116#define ecb_unused ecb_attribute ((__unused__))
89#define ecb_const ecb_attribute ((const)) 117#define ecb_const ecb_attribute ((__const__))
90#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__))
91#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 122 #define ecb_hot ecb_attribute ((__hot__))
92#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
93 129
94/* put into ifs if you are very sure that the expression */ 130/* put around conditional expressions if you are very sure that the */
95/* is mostly true or mosty false. note that these return */ 131/* expression is mostly true or mostly false. note that these return */
96/* booleans, not the expression. */ 132/* booleans, not the expression. */
97#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 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 */
98#define ecb_likely(expr) ecb_expect (!!(expr), 1) 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
197
198#if ECB_GCC_VERSION(4,5)
199 #define ecb_unreachable() __builtin_unreachable ()
200#else
201 /* this seems to work fine, but gcc always emits a warning for it :/ */
202 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
203 ecb_function_ void ecb_unreachable (void) { }
204#endif
99 205
100/* try to tell the compiler that some condition is definitely true */ 206/* try to tell the compiler that some condition is definitely true */
101#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 207#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
102 208
103/* count trailing zero bits and count # of one bits */
104#if ECB_GCC_VERSION(3,4)
105#define ecb_ctz32 (x) __builtin_ctz (x)
106#define ecb_popcount32 (x) __builtin_popcount (x)
107#else
108ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
109ECB_HEADER_INLINE
110ecb_ctz32 (uint32_t x)
111{
112 int r = 0;
113
114 x &= -x; /* this isolates the lowest bit */
115
116 if (x & 0xaaaaaaaa) r += 1;
117 if (x & 0xcccccccc) r += 2;
118 if (x & 0xf0f0f0f0) r += 4;
119 if (x & 0xff00ff00) r += 8;
120 if (x & 0xffff0000) r += 16;
121
122 return r;
123}
124
125ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
126ECB_HEADER_INLINE
127ecb_popcount32 (uint32_t x)
128{
129 x -= (x >> 1) & 0x55555555;
130 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
131 x = ((x >> 4) + x) & 0x0f0f0f0f;
132 x *= 0x01010101;
133
134 return x >> 24;
135}
136#endif
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 () ecb_const; 209ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
171ECB_HEADER_INLINE unsigned char 210ecb_function_ unsigned char
172ecb_byteorder_helper () 211ecb_byteorder_helper (void)
173{ 212{
174 const uint32_t u = 0x11223344; 213 const uint32_t u = 0x11223344;
175 return *(unsigned char *)&u; 214 return *(unsigned char *)&u;
176} 215}
177 216
178ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 217ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
179ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; 218ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
180ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 219ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
181ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; 220ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
182 221
222#if ECB_GCC_VERSION(3,0) || ECB_C99
223 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
224#else
183#define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n))) 225 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
226#endif
184 227
185#if ecb_cplusplus_does_not_suck 228#if ecb_cplusplus_does_not_suck
186// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 229 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
187template<typename T, int N> 230 template<typename T, int N>
188static inline int ecb_array_length (const T (&arr)[N]) 231 static inline int ecb_array_length (const T (&arr)[N])
189{ 232 {
190 return N; 233 return N;
191} 234 }
192#else 235#else
193#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 236 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
194#endif 237#endif
195 238
196ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 239ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
197ECB_INLINE uint32_t 240ecb_inline uint32_t
198ecb_rotr32 (uint32_t x, unsigned int count) 241ecb_rotr32 (uint32_t x, unsigned int count)
199{ 242{
200 return (x << (32 - count)) | (x >> count); 243 return (x << (32 - count)) | (x >> count);
201} 244}
202 245
203ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; 246ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
204ECB_INLINE uint32_t 247ecb_inline uint32_t
205ecb_rotl32 (uint32_t x, unsigned int count) 248ecb_rotl32 (uint32_t x, unsigned int count)
206{ 249{
207 return (x >> (32 - count)) | (x << count); 250 return (x >> (32 - count)) | (x << count);
208} 251}
209 252

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