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 | * |
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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 | |
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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 in return for some better fake benchmark numbers. |
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38 | * or so. |
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39 | * we try to detect these and simply assume they are not gcc - if they have |
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40 | * an issue with that they should have done it right in the first place. |
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41 | */ |
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42 | #ifndef ECB_GCC_VERSION |
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43 | # if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
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44 | # define ECB_GCC_VERSION(major,minor) 0 |
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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))) |
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47 | # endif |
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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 |
40 | typedef _Bool ecb_bool; |
53 | typedef _Bool ecb_bool; |
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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 */ |
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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) |
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82 | # define ecb_unreachable() __builtin_unreachable () |
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83 | #else |
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84 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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85 | ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); |
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86 | ECB_HEADER_INLINE void ecb_unreachable () { } |
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87 | #endif |
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88 | |
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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) |
100 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } |
105 | #define ecb_ctz32 (x) __builtin_ctz (x) |
101 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } |
106 | #define ecb_popcount32 (x) __builtin_popcount (x) |
102 | #else |
107 | #else |
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108 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
103 | ECB_HEADER_INLINE |
109 | ECB_HEADER_INLINE |
104 | ecb_ctz32 (uint32_t x) ecb_const |
110 | ecb_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 | |
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114 | if (x & 0xffff0000) r += 16; |
120 | if (x & 0xffff0000) r += 16; |
115 | |
121 | |
116 | return r; |
122 | return r; |
117 | } |
123 | } |
118 | |
124 | |
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125 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
119 | ECB_HEADER_INLINE |
126 | ECB_HEADER_INLINE |
120 | ecb_popcount32 (uint32_t x) ecb_const |
127 | ecb_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 | |
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138 | #if ECB_GCC_VERSION(4,3) |
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139 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
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140 | # define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
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141 | #else |
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142 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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143 | ECB_HEADER_INLINE uint32_t |
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144 | ecb_bswap32 (uint32_t x) |
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145 | { |
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146 | return (x >> 24) |
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147 | | ((x >> 8) & 0x0000ff00) |
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148 | | ((x << 8) & 0x00ff0000) |
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149 | | (x << 24); |
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150 | } |
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151 | |
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152 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
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153 | ECB_HEADER_INLINE uint32_t |
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154 | ecb_bswap16 (uint32_t x) |
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155 | { |
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156 | return ((x >> 8) & 0xff) |
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157 | | ((x << 8) & 0x00ff0000) |
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158 | | (x << 24); |
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159 | } |
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160 | #endif |
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161 | |
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162 | #if ECB_GCC_VERSION(4,5) |
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163 | # define ecb_unreachable() __builtin_unreachable () |
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164 | #else |
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165 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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166 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
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167 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
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168 | #endif |
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169 | |
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170 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
131 | ECB_HEADER_INLINE unsigned char |
171 | ECB_HEADER_INLINE unsigned char |
132 | ecb_byteorder_helper () ecb_const |
172 | ecb_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 | |
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178 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
138 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; |
179 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
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180 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
139 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; |
181 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
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182 | |
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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) |
143 | template<typename T, int N> |
187 | template<typename T, int N> |
144 | static inline int ecb_array_length (const T (&arr)[N]) |
188 | static inline int ecb_array_length (const T (&arr)[N]) |
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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 | |
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196 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
152 | ECB_INLINE uint32_t |
197 | ECB_INLINE uint32_t |
153 | ecb_rotr32 (uint32_t x, unsigned int count) |
198 | ecb_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 | |
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203 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
158 | ECB_INLINE uint32_t |
204 | ECB_INLINE uint32_t |
159 | ecb_rotl32 (uint32_t x, unsigned int count) |
205 | ecb_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) |
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165 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
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166 | #else |
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167 | ECB_GCC_VERSION uint32_t |
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168 | ecb_bswap32 (uint32_t x) |
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169 | { |
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170 | return (x >> 24) |
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171 | | ((x >> 8) & 0x0000ff00) |
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172 | | ((x << 8) & 0x00ff0000) |
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173 | | (x << 24); |
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174 | } |
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175 | #endif |
210 | #endif |
176 | |
211 | |
177 | #endif |
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178 | |
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