1 | #ifndef UTIL_H__ |
1 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
2 | #define UTIL_H__ |
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3 | |
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4 | //#define PREFER_MALLOC |
3 | |
5 | |
4 | #if __GNUC__ >= 3 |
6 | #if __GNUC__ >= 3 |
5 | # define is_constant(c) __builtin_constant_p (c) |
7 | # define is_constant(c) __builtin_constant_p (c) |
6 | #else |
8 | #else |
7 | # define is_constant(c) 0 |
9 | # define is_constant(c) 0 |
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35 | #define IN_RANGE_EXC(val,beg,end) \ |
37 | #define IN_RANGE_EXC(val,beg,end) \ |
36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
38 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
37 | |
39 | |
38 | void fork_abort (const char *msg); |
40 | void fork_abort (const char *msg); |
39 | |
41 | |
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42 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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43 | // 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; } |
44 | 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; } |
45 | 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; } |
46 | 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 | |
47 | |
44 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
48 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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49 | |
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50 | // lots of stuff taken from FXT |
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51 | |
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52 | /* Rotate right. This is used in various places for checksumming */ |
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53 | //TODO: this sucks, use a better checksum algo |
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54 | static inline uint32_t |
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55 | rotate_right (uint32_t c) |
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56 | { |
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57 | return (c << 31) | (c >> 1); |
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58 | } |
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59 | |
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60 | // Return abs(a-b) |
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61 | // Both a and b must not have the most significant bit set |
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62 | static inline uint32_t |
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63 | upos_abs_diff (uint32_t a, uint32_t b) |
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64 | { |
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65 | long d1 = b - a; |
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66 | long d2 = (d1 & (d1 >> 31)) << 1; |
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67 | |
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68 | return d1 - d2; // == (b - d) - (a + d); |
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69 | } |
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70 | |
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71 | // Both a and b must not have the most significant bit set |
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72 | static inline uint32_t |
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73 | upos_min (uint32_t a, uint32_t b) |
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74 | { |
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75 | int32_t d = b - a; |
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76 | d &= d >> 31; |
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77 | return a + d; |
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78 | } |
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79 | |
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80 | // Both a and b must not have the most significant bit set |
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81 | static inline uint32_t |
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82 | upos_max (uint32_t a, uint32_t b) |
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83 | { |
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84 | int32_t d = b - a; |
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85 | d &= d >> 31; |
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86 | return b - d; |
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87 | } |
45 | |
88 | |
46 | // this is much faster than crossfires original algorithm |
89 | // this is much faster than crossfires original algorithm |
47 | // on modern cpus |
90 | // on modern cpus |
48 | inline int |
91 | inline int |
49 | isqrt (int n) |
92 | isqrt (int n) |
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131 | |
174 | |
132 | // for symmetry |
175 | // for symmetry |
133 | template<typename T> |
176 | template<typename T> |
134 | inline void sfree (T *ptr, int n = 1) throw () |
177 | inline void sfree (T *ptr, int n = 1) throw () |
135 | { |
178 | { |
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179 | #ifdef PREFER_MALLOC |
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180 | free (ptr); |
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181 | #else |
136 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
182 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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183 | #endif |
137 | } |
184 | } |
138 | |
185 | |
139 | // a STL-compatible allocator that uses g_slice |
186 | // a STL-compatible allocator that uses g_slice |
140 | // boy, this is verbose |
187 | // boy, this is verbose |
141 | template<typename Tp> |
188 | template<typename Tp> |
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194 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
241 | // 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 |
242 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
196 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
243 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
197 | struct tausworthe_random_generator |
244 | struct tausworthe_random_generator |
198 | { |
245 | { |
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246 | // generator |
199 | uint32_t state [4]; |
247 | uint32_t state [4]; |
200 | |
248 | |
201 | tausworthe_random_generator (uint32_t seed); |
249 | void operator =(const tausworthe_random_generator &src) |
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250 | { |
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251 | state [0] = src.state [0]; |
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252 | state [1] = src.state [1]; |
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253 | state [2] = src.state [2]; |
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254 | state [3] = src.state [3]; |
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255 | } |
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256 | |
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257 | void seed (uint32_t seed); |
202 | uint32_t next (); |
258 | uint32_t next (); |
203 | |
259 | |
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260 | // uniform distribution |
204 | uint32_t operator ()(uint32_t r_max) |
261 | uint32_t operator ()(uint32_t r_max) |
205 | { |
262 | { |
206 | return next () % r_max; |
263 | return is_constant (r_max) |
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264 | ? this->next () % r_max |
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265 | : get_range (r_max); |
207 | } |
266 | } |
208 | |
267 | |
209 | // return a number within (min .. max) |
268 | // return a number within (min .. max) |
210 | int operator () (int r_min, int r_max) |
269 | int operator () (int r_min, int r_max) |
211 | { |
270 | { |
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271 | return is_constant (r_min) && is_constant (r_max) |
212 | return r_min + (*this) (max (r_max - r_min + 1, 1)); |
272 | ? r_min + (*this) (max (r_max - r_min + 1, 1)) |
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273 | : get_range (r_min, r_max); |
213 | } |
274 | } |
214 | |
275 | |
215 | double operator ()() |
276 | double operator ()() |
216 | { |
277 | { |
217 | return next () / (double)0xFFFFFFFFU; |
278 | return this->next () / (double)0xFFFFFFFFU; |
218 | } |
279 | } |
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280 | |
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281 | protected: |
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282 | uint32_t get_range (uint32_t r_max); |
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283 | int get_range (int r_min, int r_max); |
219 | }; |
284 | }; |
220 | |
285 | |
221 | typedef tausworthe_random_generator rand_gen; |
286 | typedef tausworthe_random_generator rand_gen; |
222 | |
287 | |
223 | extern rand_gen rndm; |
288 | extern rand_gen rndm; |