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Comparing libecb/ecb.h (file contents):
Revision 1.16 by root, Thu May 26 18:34:23 2011 UTC vs.
Revision 1.34 by root, Fri Jun 10 12:20:14 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 * 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:
… …
32 32
33#include <inttypes.h> 33#include <inttypes.h>
34 34
35/* many compilers define _GNUC_ to some versions but then only implement 35/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions, 36 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief for some better fake benchmark numbers or so. 37 * causing enourmous grief in return for some better fake benchmark numbers.
38 * or so.
38 * we try to detect these and simply assume they are not gcc - if they have 39 * we try to detect these and simply assume they are not gcc - if they have
39 * an issue with that they should have done it right in the first place. 40 * an issue with that they should have done it right in the first place.
40 */ 41 */
41#ifndef ECB_GCC_VERSION 42#ifndef ECB_GCC_VERSION
42# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 43# if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__)
… …
46# endif 47# endif
47#endif 48#endif
48 49
49#ifndef __cplusplus 50#ifndef __cplusplus
50# if __STDC_VERSION__ >= 199901L 51# if __STDC_VERSION__ >= 199901L
51# define ECB_INLINE inline 52# define ECB_INLINE static inline
52typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
53# else 54# else
54# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE static inline /* yeah! */
55typedef int ecb_bool; 56typedef int ecb_bool;
56# endif 57# endif
58#else
59# define ECB_INLINE static inline
60typedef bool ecb_bool;
57#endif 61#endif
58 62
59#define ECB_CONCAT_(a, b) a ## b 63#define ECB_CONCAT_(a, b) a ## b
60#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
61#define ECB_STRINGIFY_(a) # a 65#define ECB_STRINGIFY_(a) # a
62#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
63 67
64#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE ECB_INLINE
65 69
66#if ECB_GCC_VERSION(3,1) 70#if ECB_GCC_VERSION(3,1)
67# define ecb_attribute(attrlist) __attribute__(attrlist) 71# define ecb_attribute(attrlist) __attribute__(attrlist)
68# define ecb_is_constant(c) __builtin_constant_p (c) 72# define ecb_is_constant(expr) __builtin_constant_p (expr)
69# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 73# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
70# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 74# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
71#else 75#else
72# define ecb_attribute(attrlist) 76# define ecb_attribute(attrlist)
73# define ecb_is_constant(c) 0 77# define ecb_is_constant(expr) 0
74# define ecb_expect(expr,value) (expr) 78# define ecb_expect(expr,value) (expr)
75# define ecb_prefetch(addr,rw,locality) 79# define ecb_prefetch(addr,rw,locality)
76#endif 80#endif
77 81
78/* no emulation for ecb_decltype */ 82/* no emulation for ecb_decltype */
… …
80# define ecb_decltype(x) __decltype(x) 84# define ecb_decltype(x) __decltype(x)
81#elif ECB_GCC_VERSION(3,0) 85#elif ECB_GCC_VERSION(3,0)
82# define ecb_decltype(x) typeof(x) 86# define ecb_decltype(x) typeof(x)
83#endif 87#endif
84 88
89#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
85#define ecb_noinline ecb_attribute ((noinline)) 90#define ecb_noinline ecb_attribute ((__noinline__))
86#define ecb_noreturn ecb_attribute ((noreturn)) 91#define ecb_noreturn ecb_attribute ((__noreturn__))
87#define ecb_unused ecb_attribute ((unused)) 92#define ecb_unused ecb_attribute ((__unused__))
88#define ecb_const ecb_attribute ((const)) 93#define ecb_const ecb_attribute ((__const__))
89#define ecb_pure ecb_attribute ((pure)) 94#define ecb_pure ecb_attribute ((__pure__))
90#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 95#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
91#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 96#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
92 97
93/* put into ifs if you are very sure that the expression */ 98/* put into if's if you are very sure that the expression */
94/* is mostly true or mosty false. note that these return */ 99/* is mostly true or mostly false. note that these return */
95/* booleans, not the expression. */ 100/* booleans, not the expression. */
96#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 101#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
97#define ecb_likely(expr) ecb_expect (!!(expr), 1) 103#define ecb_likely(expr) ecb_expect_true (expr)
104#define ecb_unlikely(expr) ecb_expect_false (expr)
98 105
99/* try to tell the compiler that some condition is definitely true */ 106/* try to tell the compiler that some condition is definitely true */
100#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 107#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
101 108
102/* count trailing zero bits and count # of one bits */ 109/* count trailing zero bits and count # of one bits */
103#if ECB_GCC_VERSION(3,4) 110#if ECB_GCC_VERSION(3,4)
104#define ecb_ctz32 (x) __builtin_ctz (x) 111#define ecb_ctz32(x) __builtin_ctz (x)
105#define ecb_popcount32 (x) __builtin_popcount (x) 112#define ecb_popcount32(x) __builtin_popcount (x)
106#else 113#else
107ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 114ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
108ECB_HEADER_INLINE 115ECB_HEADER_INLINE int
109ecb_ctz32 (uint32_t x) 116ecb_ctz32 (uint32_t x)
110{ 117{
111 int r = 0; 118 int r = 0;
112 119
113 x &= -x; /* this isolates the lowest bit */ 120 x &= -x; /* this isolates the lowest bit */
… …
120 127
121 return r; 128 return r;
122} 129}
123 130
124ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 131ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
125ECB_HEADER_INLINE 132ECB_HEADER_INLINE int
126ecb_popcount32 (uint32_t x) 133ecb_popcount32 (uint32_t x)
127{ 134{
128 x -= (x >> 1) & 0x55555555; 135 x -= (x >> 1) & 0x55555555;
129 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 136 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
130 x = ((x >> 4) + x) & 0x0f0f0f0f; 137 x = ((x >> 4) + x) & 0x0f0f0f0f;
… …
134} 141}
135#endif 142#endif
136 143
137#if ECB_GCC_VERSION(4,3) 144#if ECB_GCC_VERSION(4,3)
138# define ecb_bswap32(x) __builtin_bswap32 (x) 145# define ecb_bswap32(x) __builtin_bswap32 (x)
146# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
139#else 147#else
140ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 148ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
141ECB_HEADER_INLINE uint32_t 149ECB_HEADER_INLINE uint32_t
142ecb_bswap32 (uint32_t x) 150ecb_bswap32 (uint32_t x)
143{ 151{
144 return (x >> 24) 152 return (x >> 24)
145 | ((x >> 8) & 0x0000ff00) 153 | ((x >> 8) & 0x0000ff00)
146 | ((x << 8) & 0x00ff0000) 154 | ((x << 8) & 0x00ff0000)
147 | (x << 24); 155 | (x << 24);
148} 156}
157
158ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
159ECB_HEADER_INLINE uint32_t
160ecb_bswap16 (uint32_t x)
161{
162 return ((x >> 8) & 0xff)
163 | ((x << 8) & 0x00ff0000)
164 | (x << 24);
165}
149#endif 166#endif
150 167
151#if ECB_GCC_VERSION(4,5) 168#if ECB_GCC_VERSION(4,5)
152# define ecb_unreachable() __builtin_unreachable () 169# define ecb_unreachable() __builtin_unreachable ()
153#else 170#else
154/* this seems to work fine, but gcc always emits a warning for it :/ */ 171/* this seems to work fine, but gcc always emits a warning for it :/ */
155ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn)); 172ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
156ECB_HEADER_INLINE void ecb_unreachable (void) { } 173ECB_HEADER_INLINE void ecb_unreachable (void) { }
157#endif 174#endif
158 175
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; 176ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
160ECB_HEADER_INLINE unsigned char 177ECB_HEADER_INLINE unsigned char
161ecb_byteorder_helper () 178ecb_byteorder_helper (void)
162{ 179{
163 const uint32_t u = 0x11223344; 180 const uint32_t u = 0x11223344;
164 return *(unsigned char *)&u; 181 return *(unsigned char *)&u;
165} 182}
166 183
167ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 184ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; 185ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
169ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 186ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; 187ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
188
189#if ECB_GCC_VERSION(3,0)
190# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191#else
192# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
193#endif
171 194
172#if ecb_cplusplus_does_not_suck 195#if ecb_cplusplus_does_not_suck
173// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 196// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
174template<typename T, int N> 197template<typename T, int N>
175static inline int ecb_array_length (const T (&arr)[N]) 198static inline int ecb_array_length (const T (&arr)[N])

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