1 | /* |
1 | /* |
2 | * libecb |
2 | * libecb |
3 | * |
3 | * |
4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann |
4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann |
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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 | * |
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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 | |
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35 | /* many compilers define _GNUC_ to some versions but then only implement |
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36 | * what their idiot authors think are the "more important" extensions, |
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37 | * causing enourmous grief for some better fake benchmark numbers or so. |
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38 | * we try to detect these and simply assume they are not gcc - if they have |
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39 | * an issue with that they should have done it right in the first place. |
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40 | */ |
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41 | #ifndef ECB_GCC_VERSION |
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42 | # if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
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43 | # define ECB_GCC_VERSION(major,minor) 0 |
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44 | # else |
34 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
45 | # define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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46 | # endif |
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47 | #endif |
35 | |
48 | |
36 | #ifndef __cplusplus |
49 | #ifndef __cplusplus |
37 | # if __STDC_VERSION__ >= 199901L |
50 | # if __STDC_VERSION__ >= 199901L |
38 | # define ECB_INLINE inline |
51 | # define ECB_INLINE inline |
39 | typedef _Bool ecb_bool; |
52 | typedef _Bool ecb_bool; |
40 | # else |
53 | # else |
41 | # define ECB_INLINE inline /* yeah! */ |
54 | # define ECB_INLINE inline /* yeah! */ |
42 | typedef int ecb_bool; |
55 | typedef int ecb_bool; |
43 | # endif |
56 | # endif |
44 | #endif |
57 | #endif |
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58 | |
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59 | #define ECB_CONCAT_(a, b) a ## b |
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60 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
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61 | #define ECB_STRINGIFY_(a) # a |
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62 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
45 | |
63 | |
46 | #define ECB_HEADER_INLINE static ECB_INLINE |
64 | #define ECB_HEADER_INLINE static ECB_INLINE |
47 | |
65 | |
48 | #if ECB_GCC_VERSION(3,1) |
66 | #if ECB_GCC_VERSION(3,1) |
49 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
67 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
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70 | #define ecb_const ecb_attribute ((const)) |
88 | #define ecb_const ecb_attribute ((const)) |
71 | #define ecb_pure ecb_attribute ((pure)) |
89 | #define ecb_pure ecb_attribute ((pure)) |
72 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
90 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
73 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
91 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
74 | |
92 | |
75 | #if ECB_GCC_VERSION(4,5) |
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76 | # define ecb_unreachable() __builtin_unreachable () |
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77 | #else |
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78 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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79 | ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); |
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80 | ECB_HEADER_INLINE void ecb_unreachable () { } |
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81 | #endif |
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82 | |
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83 | /* put into ifs if you are very sure that the expression */ |
93 | /* put into ifs if you are very sure that the expression */ |
84 | /* is mostly true or mosty false. note that these return */ |
94 | /* is mostly true or mosty false. note that these return */ |
85 | /* booleans, not the expression. */ |
95 | /* booleans, not the expression. */ |
86 | #define ecb_unlikely(expr) ecb_expect ((expr) ? 1 : 0, 0) |
96 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
87 | #define ecb_likely(expr) ecb_expect ((expr) ? 1 : 0, 1) |
97 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
88 | |
98 | |
89 | /* try to tell the compiler that some condition is definitely true */ |
99 | /* try to tell the compiler that some condition is definitely true */ |
90 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
100 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
91 | |
101 | |
92 | /* count trailing zero bits and count # of one bits */ |
102 | /* count trailing zero bits and count # of one bits */ |
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103 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
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104 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
93 | #if ECB_GCC_VERSION(3,4) |
105 | #if ECB_GCC_VERSION(3,4) |
94 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } |
106 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } |
95 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } |
107 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } |
96 | #else |
108 | #else |
97 | ECB_HEADER_INLINE |
109 | ECB_HEADER_INLINE |
98 | ecb_ctz32 (uint32_t x) ecb_const |
110 | ecb_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 | |
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109 | |
121 | |
110 | return r; |
122 | return r; |
111 | } |
123 | } |
112 | |
124 | |
113 | ECB_HEADER_INLINE |
125 | ECB_HEADER_INLINE |
114 | ecb_popcount32 (uint32_t x) ecb_const |
126 | ecb_popcount32 (uint32_t x) |
115 | { |
127 | { |
116 | x -= (x >> 1) & 0x55555555; |
128 | x -= (x >> 1) & 0x55555555; |
117 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
129 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
118 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
130 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
119 | x *= 0x01010101; |
131 | x *= 0x01010101; |
120 | |
132 | |
121 | return x >> 24; |
133 | return x >> 24; |
122 | } |
134 | } |
123 | #endif |
135 | #endif |
124 | |
136 | |
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137 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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138 | #if ECB_GCC_VERSION(4,3) |
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139 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); } |
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140 | #else |
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141 | ECB_HEADER_INLINE uint32_t |
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142 | ecb_bswap32 (uint32_t x) |
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143 | { |
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144 | return (x >> 24) |
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145 | | ((x >> 8) & 0x0000ff00) |
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146 | | ((x << 8) & 0x00ff0000) |
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147 | | (x << 24); |
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148 | } |
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149 | #endif |
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150 | |
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151 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
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152 | #if ECB_GCC_VERSION(4,5) |
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153 | ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); } |
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154 | #else |
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155 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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156 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
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157 | #endif |
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158 | |
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159 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
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160 | |
125 | ECB_HEADER_INLINE unsigned char |
161 | ECB_HEADER_INLINE unsigned char |
126 | ecb_byteorder_helper () ecb_const |
162 | ecb_byteorder_helper () |
127 | { |
163 | { |
128 | const uint32_t u = 0x11223344; |
164 | const uint32_t u = 0x11223344; |
129 | return *(unsigned char *)&u; |
165 | return *(unsigned char *)&u; |
130 | } |
166 | } |
131 | |
167 | |
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168 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; |
132 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; |
169 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; |
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170 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; |
133 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; |
171 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; |
134 | |
172 | |
135 | #if ecb_cplusplus_does_not_suck |
173 | #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) |
174 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
137 | template<typename T, int N> |
175 | template<typename T, int N> |
138 | static inline int array_length (const T (&arr)[N]) |
176 | static inline int ecb_array_length (const T (&arr)[N]) |
139 | { |
177 | { |
140 | return N; |
178 | return N; |
141 | } |
179 | } |
142 | #else |
180 | #else |
143 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
181 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
144 | #endif |
182 | #endif |
145 | |
183 | |
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184 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
146 | ECB_INLINE uint32_t |
185 | ECB_INLINE uint32_t |
147 | ecb_rotate32_right (uint32_t c, unsigned int count = 1) |
186 | ecb_rotr32 (uint32_t x, unsigned int count) |
148 | { |
187 | { |
149 | return (c << (32 - count)) | (c >> count); |
188 | return (x << (32 - count)) | (x >> count); |
150 | } |
189 | } |
151 | |
190 | |
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191 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
152 | ECB_INLINE uint32_t |
192 | ECB_INLINE uint32_t |
153 | ecb_rotate32_left (uint32_t c, unsigned int count = 1) |
193 | ecb_rotl32 (uint32_t x, unsigned int count) |
154 | { |
194 | { |
155 | return (c >> (32 - count)) | (c << count); |
195 | return (x >> (32 - count)) | (x << count); |
156 | } |
196 | } |
157 | |
197 | |
158 | #endif |
198 | #endif |
159 | |
199 | |