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64 | |
64 | |
65 | #define ECB_HEADER_INLINE static ECB_INLINE |
65 | #define ECB_HEADER_INLINE static ECB_INLINE |
66 | |
66 | |
67 | #if ECB_GCC_VERSION(3,1) |
67 | #if ECB_GCC_VERSION(3,1) |
68 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
68 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
69 | # define ecb_is_constant(c) __builtin_constant_p (c) |
69 | # define ecb_is_constant(expr) __builtin_constant_p (expr) |
70 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
70 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
71 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
71 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
72 | #else |
72 | #else |
73 | # define ecb_attribute(attrlist) |
73 | # define ecb_attribute(attrlist) |
74 | # define ecb_is_constant(c) 0 |
74 | # define ecb_is_constant(expr) 0 |
75 | # define ecb_expect(expr,value) (expr) |
75 | # define ecb_expect(expr,value) (expr) |
76 | # define ecb_prefetch(addr,rw,locality) |
76 | # define ecb_prefetch(addr,rw,locality) |
77 | #endif |
77 | #endif |
78 | |
78 | |
79 | /* no emulation for ecb_decltype */ |
79 | /* no emulation for ecb_decltype */ |
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89 | #define ecb_const ecb_attribute ((const)) |
89 | #define ecb_const ecb_attribute ((const)) |
90 | #define ecb_pure ecb_attribute ((pure)) |
90 | #define ecb_pure ecb_attribute ((pure)) |
91 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
91 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
92 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
92 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
93 | |
93 | |
94 | /* put into ifs if you are very sure that the expression */ |
94 | /* put into if's if you are very sure that the expression */ |
95 | /* is mostly true or mosty false. note that these return */ |
95 | /* is mostly true or mosty false. note that these return */ |
96 | /* booleans, not the expression. */ |
96 | /* booleans, not the expression. */ |
97 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
97 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
98 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
98 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
99 | |
99 | |
100 | /* try to tell the compiler that some condition is definitely true */ |
100 | /* try to tell the compiler that some condition is definitely true */ |
101 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
101 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
102 | |
102 | |
103 | /* count trailing zero bits and count # of one bits */ |
103 | /* count trailing zero bits and count # of one bits */ |
104 | #if ECB_GCC_VERSION(3,4) |
104 | #if ECB_GCC_VERSION(3,4) |
105 | #define ecb_ctz32 (x) __builtin_ctz (x) |
105 | #define ecb_ctz32 (x) __builtin_ctz (x) |
106 | #define ecb_popcount32 (x) __builtin_popcount (x) |
106 | #define ecb_popcount32 (x) __builtin_popcount (x) |
107 | #else |
107 | #else |
108 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
108 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
109 | ECB_HEADER_INLINE |
109 | ECB_HEADER_INLINE |
110 | ecb_ctz32 (uint32_t x) |
110 | ecb_ctz32 (uint32_t x) |
111 | { |
111 | { |
112 | int r = 0; |
112 | int r = 0; |
113 | |
113 | |
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135 | } |
135 | } |
136 | #endif |
136 | #endif |
137 | |
137 | |
138 | #if ECB_GCC_VERSION(4,3) |
138 | #if ECB_GCC_VERSION(4,3) |
139 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
139 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
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140 | # define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
140 | #else |
141 | #else |
141 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
142 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
142 | ECB_HEADER_INLINE uint32_t |
143 | ECB_HEADER_INLINE uint32_t |
143 | ecb_bswap32 (uint32_t x) |
144 | ecb_bswap32 (uint32_t x) |
144 | { |
145 | { |
145 | return (x >> 24) |
146 | return (x >> 24) |
146 | | ((x >> 8) & 0x0000ff00) |
147 | | ((x >> 8) & 0x0000ff00) |
147 | | ((x << 8) & 0x00ff0000) |
148 | | ((x << 8) & 0x00ff0000) |
148 | | (x << 24); |
149 | | (x << 24); |
149 | } |
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 | } |
150 | #endif |
160 | #endif |
151 | |
161 | |
152 | #if ECB_GCC_VERSION(4,5) |
162 | #if ECB_GCC_VERSION(4,5) |
153 | # define ecb_unreachable() __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 :/ */ |
156 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
166 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
157 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
167 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
158 | #endif |
168 | #endif |
159 | |
169 | |
160 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
170 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
161 | ECB_HEADER_INLINE unsigned char |
171 | ECB_HEADER_INLINE unsigned char |
162 | ecb_byteorder_helper () |
172 | ecb_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 | |
168 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; |
178 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
169 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; |
179 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
170 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; |
180 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
171 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () { 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))) |
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) |
175 | template<typename T, int N> |
187 | template<typename T, int N> |
176 | static inline int ecb_array_length (const T (&arr)[N]) |
188 | static inline int ecb_array_length (const T (&arr)[N]) |