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35 | #define IN_RANGE_EXC(val,beg,end) \ |
35 | #define IN_RANGE_EXC(val,beg,end) \ |
36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
37 | |
37 | |
38 | void fork_abort (const char *msg); |
38 | void fork_abort (const char *msg); |
39 | |
39 | |
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40 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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41 | // as a is often a constant while b is the variable. it is still a bug, though. |
40 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
42 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
41 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
43 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
42 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
44 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
43 | |
45 | |
44 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
46 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
45 | |
47 | |
46 | // this is much faster than crossfires original algorithm |
48 | // this is much faster than crossfires original algorithm |
47 | // on modern cpus |
49 | // on modern cpus |
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194 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
196 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
195 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
197 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
196 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
198 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
197 | struct tausworthe_random_generator |
199 | struct tausworthe_random_generator |
198 | { |
200 | { |
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201 | // generator |
199 | uint32_t state [4]; |
202 | uint32_t state [4]; |
200 | |
203 | |
201 | tausworthe_random_generator (uint32_t seed); |
204 | void operator =(const tausworthe_random_generator &src) |
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205 | { |
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206 | state [0] = src.state [0]; |
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207 | state [1] = src.state [1]; |
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208 | state [2] = src.state [2]; |
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209 | state [3] = src.state [3]; |
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210 | } |
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211 | |
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212 | void seed (uint32_t seed); |
202 | uint32_t next (); |
213 | uint32_t next (); |
203 | |
214 | |
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215 | // uniform distribution |
204 | uint32_t operator ()(uint32_t r_max) |
216 | uint32_t operator ()(uint32_t r_max) |
205 | { |
217 | { |
206 | return next () % r_max; |
218 | return is_constant (r_max) |
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219 | ? this->next () % r_max |
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220 | : get_range (r_max); |
207 | } |
221 | } |
208 | |
222 | |
209 | // return a number within (min .. max) |
223 | // return a number within (min .. max) |
210 | int operator () (int r_min, int r_max) |
224 | int operator () (int r_min, int r_max) |
211 | { |
225 | { |
212 | return r_min + next () % max (r_max - r_min + 1, 1); |
226 | return is_constant (r_min) && is_constant (r_max) |
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227 | ? r_min + (*this) (max (r_max - r_min + 1, 1)) |
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228 | : get_range (r_min, r_max); |
213 | } |
229 | } |
214 | |
230 | |
215 | double operator ()() |
231 | double operator ()() |
216 | { |
232 | { |
217 | return next () / (double)0xFFFFFFFFU; |
233 | return this->next () / (double)0xFFFFFFFFU; |
218 | } |
234 | } |
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235 | |
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236 | protected: |
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237 | uint32_t get_range (uint32_t r_max); |
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238 | int get_range (int r_min, int r_max); |
219 | }; |
239 | }; |
220 | |
240 | |
221 | typedef tausworthe_random_generator rand_gen; |
241 | typedef tausworthe_random_generator rand_gen; |
222 | |
242 | |
223 | extern rand_gen rndm; |
243 | extern rand_gen rndm; |