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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. |
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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__) |
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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 */ |
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80 | # define ecb_decltype(x) __decltype(x) |
81 | # define ecb_decltype(x) __decltype(x) |
81 | #elif ECB_GCC_VERSION(3,0) |
82 | #elif ECB_GCC_VERSION(3,0) |
82 | # define ecb_decltype(x) typeof(x) |
83 | # define ecb_decltype(x) typeof(x) |
83 | #endif |
84 | #endif |
84 | |
85 | |
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86 | #define ecb_artificial ecb_attribute ((__artificial__)) |
85 | #define ecb_noinline ecb_attribute ((noinline)) |
87 | #define ecb_noinline ecb_attribute ((__noinline__)) |
86 | #define ecb_noreturn ecb_attribute ((noreturn)) |
88 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
87 | #define ecb_unused ecb_attribute ((unused)) |
89 | #define ecb_unused ecb_attribute ((__unused__)) |
88 | #define ecb_const ecb_attribute ((const)) |
90 | #define ecb_const ecb_attribute ((__const__)) |
89 | #define ecb_pure ecb_attribute ((pure)) |
91 | #define ecb_pure ecb_attribute ((__pure__)) |
90 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
92 | #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ |
91 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
93 | #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ |
92 | |
94 | |
93 | /* put into ifs if you are very sure that the expression */ |
95 | /* put into if's if you are very sure that the expression */ |
94 | /* is mostly true or mosty false. note that these return */ |
96 | /* is mostly true or mosty false. note that these return */ |
95 | /* booleans, not the expression. */ |
97 | /* booleans, not the expression. */ |
96 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
98 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
97 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
99 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
98 | |
100 | |
99 | /* try to tell the compiler that some condition is definitely true */ |
101 | /* try to tell the compiler that some condition is definitely true */ |
100 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
102 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
101 | |
103 | |
102 | /* count trailing zero bits and count # of one bits */ |
104 | /* count trailing zero bits and count # of one bits */ |
103 | #if ECB_GCC_VERSION(3,4) |
105 | #if ECB_GCC_VERSION(3,4) |
104 | #define ecb_ctz32 (x) __builtin_ctz (x) |
106 | #define ecb_ctz32 (x) __builtin_ctz (x) |
105 | #define ecb_popcount32 (x) __builtin_popcount (x) |
107 | #define ecb_popcount32 (x) __builtin_popcount (x) |
106 | #else |
108 | #else |
107 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
109 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
108 | ECB_HEADER_INLINE |
110 | ECB_HEADER_INLINE |
109 | ecb_ctz32 (uint32_t x) |
111 | ecb_ctz32 (uint32_t x) |
110 | { |
112 | { |
111 | int r = 0; |
113 | int r = 0; |
112 | |
114 | |
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134 | } |
136 | } |
135 | #endif |
137 | #endif |
136 | |
138 | |
137 | #if ECB_GCC_VERSION(4,3) |
139 | #if ECB_GCC_VERSION(4,3) |
138 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
140 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
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141 | # define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
139 | #else |
142 | #else |
140 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
143 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
141 | ECB_HEADER_INLINE uint32_t |
144 | ECB_HEADER_INLINE uint32_t |
142 | ecb_bswap32 (uint32_t x) |
145 | ecb_bswap32 (uint32_t x) |
143 | { |
146 | { |
144 | return (x >> 24) |
147 | return (x >> 24) |
145 | | ((x >> 8) & 0x0000ff00) |
148 | | ((x >> 8) & 0x0000ff00) |
146 | | ((x << 8) & 0x00ff0000) |
149 | | ((x << 8) & 0x00ff0000) |
147 | | (x << 24); |
150 | | (x << 24); |
148 | } |
151 | } |
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152 | |
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153 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
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154 | ECB_HEADER_INLINE uint32_t |
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155 | ecb_bswap16 (uint32_t x) |
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156 | { |
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157 | return ((x >> 8) & 0xff) |
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158 | | ((x << 8) & 0x00ff0000) |
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159 | | (x << 24); |
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160 | } |
149 | #endif |
161 | #endif |
150 | |
162 | |
151 | #if ECB_GCC_VERSION(4,5) |
163 | #if ECB_GCC_VERSION(4,5) |
152 | # define ecb_unreachable() __builtin_unreachable () |
164 | # define ecb_unreachable() __builtin_unreachable () |
153 | #else |
165 | #else |
154 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
166 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
155 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
167 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
156 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
168 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
157 | #endif |
169 | #endif |
158 | |
170 | |
159 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
171 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
160 | ECB_HEADER_INLINE unsigned char |
172 | ECB_HEADER_INLINE unsigned char |
161 | ecb_byteorder_helper () |
173 | ecb_byteorder_helper (void) |
162 | { |
174 | { |
163 | const uint32_t u = 0x11223344; |
175 | const uint32_t u = 0x11223344; |
164 | return *(unsigned char *)&u; |
176 | return *(unsigned char *)&u; |
165 | } |
177 | } |
166 | |
178 | |
167 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; |
179 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
168 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; |
180 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
169 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; |
181 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
170 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; |
182 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
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183 | |
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184 | #define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n))) |
171 | |
185 | |
172 | #if ecb_cplusplus_does_not_suck |
186 | #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) |
187 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
174 | template<typename T, int N> |
188 | template<typename T, int N> |
175 | static inline int ecb_array_length (const T (&arr)[N]) |
189 | static inline int ecb_array_length (const T (&arr)[N]) |