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45 | #else |
45 | #else |
46 | #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))) |
47 | #endif |
47 | #endif |
48 | #endif |
48 | #endif |
49 | |
49 | |
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50 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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51 | |
50 | #ifndef __cplusplus |
52 | #if __cplusplus |
51 | #if __STDC_VERSION__ >= 199901L |
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52 | #define ECB_INLINE static inline |
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53 | typedef _Bool ecb_bool; |
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54 | #else |
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55 | #define ECB_INLINE static inline /* we assume the extension is ubiquituous, please tell us when we are wrong, or upgrade to the GCC */ |
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56 | typedef int ecb_bool; |
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57 | #endif |
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58 | #else |
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59 | #define ECB_INLINE static inline |
53 | #define ECB_INLINE static inline |
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54 | #elif ECB_GCC_VERSION(2,5) |
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55 | #define ECB_INLINE static __inline__ |
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56 | #elif ECB_C99 |
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57 | #define ECB_INLINE static inline |
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58 | #else |
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59 | #define ECB_INLINE static |
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60 | #endif |
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61 | |
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62 | #if ECB_GCC_VERSION(3,3) |
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63 | #define ecb_restrict __restrict__ |
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64 | #elif ECB_C99 |
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65 | #define ecb_restrict restrict |
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66 | #else |
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67 | #define ecb_restrict |
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68 | #endif |
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69 | |
60 | typedef bool ecb_bool; |
70 | typedef int ecb_bool; |
61 | #endif |
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62 | |
71 | |
63 | #define ECB_CONCAT_(a, b) a ## b |
72 | #define ECB_CONCAT_(a, b) a ## b |
64 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
73 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
65 | #define ECB_STRINGIFY_(a) # a |
74 | #define ECB_STRINGIFY_(a) # a |
66 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
75 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
67 | |
76 | |
68 | #define ECB_HEADER_INLINE ECB_INLINE |
77 | #define ecb_function_ ECB_INLINE |
69 | |
78 | |
70 | #if ECB_GCC_VERSION(3,1) |
79 | #if ECB_GCC_VERSION(3,1) |
71 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
80 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
72 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
81 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
73 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
82 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
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81 | |
90 | |
82 | /* no emulation for ecb_decltype */ |
91 | /* no emulation for ecb_decltype */ |
83 | #if ECB_GCC_VERSION(4,5) |
92 | #if ECB_GCC_VERSION(4,5) |
84 | #define ecb_decltype(x) __decltype(x) |
93 | #define ecb_decltype(x) __decltype(x) |
85 | #elif ECB_GCC_VERSION(3,0) |
94 | #elif ECB_GCC_VERSION(3,0) |
86 | #define ecb_decltype(x) typeof(x) |
95 | #define ecb_decltype(x) __typeof(x) |
87 | #endif |
96 | #endif |
88 | |
97 | |
89 | #define ecb_noinline ecb_attribute ((__noinline__)) |
98 | #define ecb_noinline ecb_attribute ((__noinline__)) |
90 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
99 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
91 | #define ecb_unused ecb_attribute ((__unused__)) |
100 | #define ecb_unused ecb_attribute ((__unused__)) |
92 | #define ecb_const ecb_attribute ((__const__)) |
101 | #define ecb_const ecb_attribute ((__const__)) |
93 | #define ecb_pure ecb_attribute ((__pure__)) |
102 | #define ecb_pure ecb_attribute ((__pure__)) |
94 | |
103 | |
95 | #if ECB_GCC_VERSION(4,3) |
104 | #if ECB_GCC_VERSION(4,3) |
96 | #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ |
105 | #define ecb_artificial ecb_attribute ((__artificial__)) |
97 | #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ |
106 | #define ecb_hot ecb_attribute ((__hot__)) |
98 | #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ |
107 | #define ecb_cold ecb_attribute ((__cold__)) |
99 | #else |
108 | #else |
100 | #define ecb_artificial |
109 | #define ecb_artificial |
101 | #define ecb_hot |
110 | #define ecb_hot |
102 | #define ecb_cold |
111 | #define ecb_cold |
103 | #endif |
112 | #endif |
104 | |
113 | |
105 | /* put into if's if you are very sure that the expression */ |
114 | /* put around conditional expressions if you are very sure that the */ |
106 | /* is mostly true or mostly false. note that these return */ |
115 | /* expression is mostly true or mostly false. note that these return */ |
107 | /* booleans, not the expression. */ |
116 | /* booleans, not the expression. */ |
108 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
117 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
109 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
118 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
110 | /* for compatibility to the rest of the world */ |
119 | /* for compatibility to the rest of the world */ |
111 | #define ecb_likely(expr) ecb_expect_true (expr) |
120 | #define ecb_likely(expr) ecb_expect_true (expr) |
112 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
121 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
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117 | /* count trailing zero bits and count # of one bits */ |
126 | /* count trailing zero bits and count # of one bits */ |
118 | #if ECB_GCC_VERSION(3,4) |
127 | #if ECB_GCC_VERSION(3,4) |
119 | #define ecb_ctz32(x) __builtin_ctz (x) |
128 | #define ecb_ctz32(x) __builtin_ctz (x) |
120 | #define ecb_popcount32(x) __builtin_popcount (x) |
129 | #define ecb_popcount32(x) __builtin_popcount (x) |
121 | #else |
130 | #else |
122 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
131 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
123 | ECB_HEADER_INLINE int |
132 | ecb_function_ int |
124 | ecb_ctz32 (uint32_t x) |
133 | ecb_ctz32 (uint32_t x) |
125 | { |
134 | { |
126 | int r = 0; |
135 | int r = 0; |
127 | |
136 | |
128 | x &= -x; /* this isolates the lowest bit */ |
137 | x &= -x; /* this isolates the lowest bit */ |
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… | |
134 | if (x & 0xffff0000) r += 16; |
143 | if (x & 0xffff0000) r += 16; |
135 | |
144 | |
136 | return r; |
145 | return r; |
137 | } |
146 | } |
138 | |
147 | |
139 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
148 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
140 | ECB_HEADER_INLINE int |
149 | ecb_function_ int |
141 | ecb_popcount32 (uint32_t x) |
150 | ecb_popcount32 (uint32_t x) |
142 | { |
151 | { |
143 | x -= (x >> 1) & 0x55555555; |
152 | x -= (x >> 1) & 0x55555555; |
144 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
153 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
145 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
154 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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151 | |
160 | |
152 | #if ECB_GCC_VERSION(4,3) |
161 | #if ECB_GCC_VERSION(4,3) |
153 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
162 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
154 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
163 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
155 | #else |
164 | #else |
156 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
165 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
157 | ECB_HEADER_INLINE uint32_t |
166 | ecb_function_ uint32_t |
158 | ecb_bswap32 (uint32_t x) |
167 | ecb_bswap32 (uint32_t x) |
159 | { |
168 | { |
160 | return (x >> 24) |
169 | return (x >> 24) |
161 | | ((x >> 8) & 0x0000ff00) |
170 | | ((x >> 8) & 0x0000ff00) |
162 | | ((x << 8) & 0x00ff0000) |
171 | | ((x << 8) & 0x00ff0000) |
163 | | (x << 24); |
172 | | (x << 24); |
164 | } |
173 | } |
165 | |
174 | |
166 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
175 | ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
167 | ECB_HEADER_INLINE uint32_t |
176 | ecb_function_ uint32_t |
168 | ecb_bswap16 (uint32_t x) |
177 | ecb_bswap16 (uint32_t x) |
169 | { |
178 | { |
170 | return ((x >> 8) & 0xff) |
179 | return ((x >> 8) & 0xff) |
171 | | ((x << 8) & 0x00ff0000) |
180 | | ((x << 8) & 0x00ff0000) |
172 | | (x << 24); |
181 | | (x << 24); |
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175 | |
184 | |
176 | #if ECB_GCC_VERSION(4,5) |
185 | #if ECB_GCC_VERSION(4,5) |
177 | #define ecb_unreachable() __builtin_unreachable () |
186 | #define ecb_unreachable() __builtin_unreachable () |
178 | #else |
187 | #else |
179 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
188 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
180 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
189 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
181 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
190 | ecb_function_ void ecb_unreachable (void) { } |
182 | #endif |
191 | #endif |
183 | |
192 | |
184 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
193 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
185 | ECB_HEADER_INLINE unsigned char |
194 | ecb_function_ unsigned char |
186 | ecb_byteorder_helper (void) |
195 | ecb_byteorder_helper (void) |
187 | { |
196 | { |
188 | const uint32_t u = 0x11223344; |
197 | const uint32_t u = 0x11223344; |
189 | return *(unsigned char *)&u; |
198 | return *(unsigned char *)&u; |
190 | } |
199 | } |
191 | |
200 | |
192 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
201 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
193 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
202 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
194 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
203 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
195 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
204 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
196 | |
205 | |
197 | #if ECB_GCC_VERSION(3,0) |
206 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
198 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
207 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
199 | #else |
208 | #else |
200 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
209 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
201 | #endif |
210 | #endif |
202 | |
211 | |