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Comparing libecb/ecb.h (file contents):
Revision 1.14 by root, Thu May 26 18:26:59 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 *
… …
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__)
… …
63 64
64#define ECB_HEADER_INLINE static ECB_INLINE 65#define ECB_HEADER_INLINE static ECB_INLINE
65 66
66#if ECB_GCC_VERSION(3,1) 67#if ECB_GCC_VERSION(3,1)
67# define ecb_attribute(attrlist) __attribute__(attrlist) 68# define ecb_attribute(attrlist) __attribute__(attrlist)
68# define ecb_is_constant(c) __builtin_constant_p (c) 69# define ecb_is_constant(expr) __builtin_constant_p (expr)
69# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 70# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
70# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 71# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
71#else 72#else
72# define ecb_attribute(attrlist) 73# define ecb_attribute(attrlist)
73# define ecb_is_constant(c) 0 74# define ecb_is_constant(expr) 0
74# define ecb_expect(expr,value) (expr) 75# define ecb_expect(expr,value) (expr)
75# define ecb_prefetch(addr,rw,locality) 76# define ecb_prefetch(addr,rw,locality)
76#endif 77#endif
77 78
78/* no emulation for ecb_decltype */ 79/* no emulation for ecb_decltype */
… …
88#define ecb_const ecb_attribute ((const)) 89#define ecb_const ecb_attribute ((const))
89#define ecb_pure ecb_attribute ((pure)) 90#define ecb_pure ecb_attribute ((pure))
90#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 91#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
91#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 92#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
92 93
93/* put into ifs if you are very sure that the expression */ 94/* put into if's if you are very sure that the expression */
94/* is mostly true or mosty false. note that these return */ 95/* is mostly true or mosty false. note that these return */
95/* booleans, not the expression. */ 96/* booleans, not the expression. */
96#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 97#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
97#define ecb_likely(expr) ecb_expect (!!(expr), 1) 98#define ecb_likely(expr) ecb_expect (!!(expr), 1)
98 99
99/* try to tell the compiler that some condition is definitely true */ 100/* try to tell the compiler that some condition is definitely true */
100#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 101#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
101 102
102/* count trailing zero bits and count # of one bits */ 103/* count trailing zero bits and count # of one bits */
103ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
104ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
105#if ECB_GCC_VERSION(3,4) 104#if ECB_GCC_VERSION(3,4)
106ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 105#define ecb_ctz32 (x) __builtin_ctz (x)
107ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } 106#define ecb_popcount32 (x) __builtin_popcount (x)
108#else 107#else
108ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
109ECB_HEADER_INLINE 109ECB_HEADER_INLINE
110ecb_ctz32 (uint32_t x) 110ecb_ctz32 (uint32_t x)
111{ 111{
112 int r = 0; 112 int r = 0;
113 113
… …
120 if (x & 0xffff0000) r += 16; 120 if (x & 0xffff0000) r += 16;
121 121
122 return r; 122 return r;
123} 123}
124 124
125ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
125ECB_HEADER_INLINE 126ECB_HEADER_INLINE
126ecb_popcount32 (uint32_t x) 127ecb_popcount32 (uint32_t x)
127{ 128{
128 x -= (x >> 1) & 0x55555555; 129 x -= (x >> 1) & 0x55555555;
129 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 130 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
… …
132 133
133 return x >> 24; 134 return x >> 24;
134} 135}
135#endif 136#endif
136 137
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
137ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 142ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
138#if ECB_GCC_VERSION(4,3)
139ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); }
140#else
141ECB_HEADER_INLINE uint32_t 143ECB_HEADER_INLINE uint32_t
142ecb_bswap32 (uint32_t x) 144ecb_bswap32 (uint32_t x)
143{ 145{
144 return (x >> 24) 146 return (x >> 24)
145 | ((x >> 8) & 0x0000ff00) 147 | ((x >> 8) & 0x0000ff00)
146 | ((x << 8) & 0x00ff0000) 148 | ((x << 8) & 0x00ff0000)
147 | (x << 24); 149 | (x << 24);
148} 150}
149#endif
150 151
151ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn)); 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
152#if ECB_GCC_VERSION(4,5) 162#if ECB_GCC_VERSION(4,5)
153ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); } 163# define ecb_unreachable() __builtin_unreachable ()
154#else 164#else
155/* this seems to work fine, but gcc always emits a warning for it :/ */ 165/* this seems to work fine, but gcc always emits a warning for it :/ */
166ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
156ECB_HEADER_INLINE void ecb_unreachable (void) { } 167ECB_HEADER_INLINE void ecb_unreachable (void) { }
157#endif 168#endif
158 169
159ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; 170ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
160
161ECB_HEADER_INLINE unsigned char 171ECB_HEADER_INLINE unsigned char
162ecb_byteorder_helper () 172ecb_byteorder_helper (void)
163{ 173{
164 const uint32_t u = 0x11223344; 174 const uint32_t u = 0x11223344;
165 return *(unsigned char *)&u; 175 return *(unsigned char *)&u;
166} 176}
167 177
168ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; 178ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
169ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; 179ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
170ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; 180ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
171ECB_HEADER_INLINE ecb_bool ecb_little_endian () { 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)))
172 184
173#if ecb_cplusplus_does_not_suck 185#if ecb_cplusplus_does_not_suck
174// 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)
175template<typename T, int N> 187template<typename T, int N>
176static inline int ecb_array_length (const T (&arr)[N]) 188static inline int ecb_array_length (const T (&arr)[N])

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