pike.git/ src/ stuff.c

Branch: Tag:

2001-09-01

2001-09-01 01:45:52 by Fredrik Hübinette (Hubbe) <hubbe@hubbe.net>

mapping hash table sizes are now always primes

Rev: src/mapping.c:1.132
Rev: src/stuff.c:1.14
Rev: src/stuff.h:1.12
Rev: src/svalue.c:1.118

5:   \*/      /* -  * $Id: stuff.c,v 1.13 2000/09/20 02:04:26 hubbe Exp $ +  * $Id: stuff.c,v 1.14 2001/09/01 01:45:52 hubbe Exp $    */   #include "global.h"   #include "stuff.h"
147:    }    return x;   } +  + /* This routine basically finds a prime number +  * which is larger than 'x' +  */ + unsigned long find_good_hash_size(unsigned long num) + { +  static unsigned long primes[864] = +  { +  37UL, 37UL, 37UL, 37UL, +  37UL, 37UL, 41UL, 41UL, +  41UL, 41UL, 43UL, 43UL, +  47UL, 47UL, 47UL, 47UL, +  53UL, 53UL, 53UL, 53UL, +  53UL, 53UL, 59UL, 59UL, +  59UL, 59UL, 59UL, 59UL, +  61UL, 61UL, 67UL, 67UL, +  67UL, 67UL, 71UL, 71UL, +  73UL, 79UL, 79UL, 79UL, +  83UL, 83UL, 89UL, 89UL, +  89UL, 97UL, 97UL, 97UL, +  97UL, 101UL, 101UL, 103UL, +  107UL, 107UL, 109UL, 113UL, +  113UL, 127UL, 127UL, 127UL, +  127UL, 127UL, 127UL, 127UL, +  131UL, 137UL, 139UL, 149UL, +  149UL, 151UL, 157UL, 163UL, +  163UL, 167UL, 173UL, 179UL, +  179UL, 191UL, 191UL, 191UL, +  197UL, 199UL, 211UL, 211UL, +  211UL, 223UL, 223UL, 223UL, +  227UL, 233UL, 239UL, 239UL, +  251UL, 251UL, 251UL, 257UL, +  263UL, 271UL, 281UL, 293UL, +  307UL, 307UL, 311UL, 331UL, +  331UL, 337UL, 347UL, 353UL, +  359UL, 367UL, 379UL, 383UL, +  397UL, 401UL, 409UL, 419UL, +  431UL, 431UL, 439UL, 449UL, +  457UL, 463UL, 479UL, 479UL, +  487UL, 499UL, 503UL, 521UL, +  541UL, 547UL, 563UL, 577UL, +  593UL, 607UL, 631UL, 641UL, +  659UL, 673UL, 691UL, 709UL, +  719UL, 739UL, 751UL, 769UL, +  787UL, 809UL, 821UL, 839UL, +  853UL, 863UL, 881UL, 907UL, +  911UL, 929UL, 947UL, 967UL, +  977UL, 991UL, 1009UL, 1031UL, +  1061UL, 1087UL, 1123UL, 1151UL, +  1187UL, 1217UL, 1249UL, 1279UL, +  1319UL, 1361UL, 1381UL, 1409UL, +  1439UL, 1471UL, 1511UL, 1543UL, +  1567UL, 1601UL, 1637UL, 1663UL, +  1697UL, 1733UL, 1759UL, 1801UL, +  1823UL, 1861UL, 1889UL, 1931UL, +  1951UL, 1987UL, 2017UL, 2053UL, +  2111UL, 2179UL, 2239UL, 2309UL, +  2371UL, 2437UL, 2503UL, 2579UL, +  2633UL, 2687UL, 2753UL, 2819UL, +  2879UL, 2953UL, 3011UL, 3079UL, +  3137UL, 3203UL, 3271UL, 3329UL, +  3391UL, 3457UL, 3527UL, 3583UL, +  3659UL, 3719UL, 3779UL, 3847UL, +  3907UL, 3967UL, 4049UL, 4099UL, +  4229UL, 4357UL, 4481UL, 4621UL, +  4751UL, 4871UL, 4993UL, 5119UL, +  5261UL, 5381UL, 5503UL, 5639UL, +  5779UL, 5897UL, 6029UL, 6143UL, +  6271UL, 6421UL, 6529UL, 6659UL, +  6791UL, 6911UL, 7039UL, 7177UL, +  7297UL, 7433UL, 7559UL, 7681UL, +  7817UL, 7937UL, 8069UL, 8191UL, +  8447UL, 8707UL, 8963UL, 9221UL, +  9473UL, 9733UL, 10007UL, 10243UL, +  10499UL, 10753UL, 11027UL, 11273UL, +  11519UL, 11777UL, 12037UL, 12289UL, +  12547UL, 12799UL, 13063UL, 13313UL, +  13567UL, 13829UL, 14081UL, 14341UL, +  14591UL, 14851UL, 15107UL, 15359UL, +  15619UL, 15877UL, 16127UL, 16411UL, +  16901UL, 17417UL, 17921UL, 18433UL, +  18947UL, 19457UL, 19973UL, 20479UL, +  21001UL, 21503UL, 22027UL, 22531UL, +  23039UL, 23557UL, 24071UL, 24593UL, +  25087UL, 25601UL, 26111UL, 26627UL, +  27143UL, 27647UL, 28163UL, 28687UL, +  29191UL, 29717UL, 30211UL, 30727UL, +  31231UL, 31751UL, 32257UL, 32771UL, +  33791UL, 34819UL, 35839UL, 36871UL, +  37889UL, 38917UL, 39937UL, 40961UL, +  41983UL, 43013UL, 44041UL, 45061UL, +  46091UL, 47111UL, 48131UL, 49157UL, +  50177UL, 51199UL, 52223UL, 53267UL, +  54277UL, 55313UL, 56333UL, 57347UL, +  58367UL, 59393UL, 60427UL, 61441UL, +  62467UL, 63487UL, 64513UL, 65537UL, +  67589UL, 69653UL, 71693UL, 73727UL, +  75781UL, 77839UL, 79873UL, 81919UL, +  83969UL, 86017UL, 88069UL, 90121UL, +  92173UL, 94207UL, 96259UL, 98317UL, +  100357UL, 102407UL, 104459UL, 106501UL, +  108553UL, 110597UL, 112643UL, 114689UL, +  116741UL, 118787UL, 120833UL, 122887UL, +  124951UL, 126989UL, 129023UL, 131071UL, +  135173UL, 139267UL, 143387UL, 147457UL, +  151553UL, 155653UL, 159763UL, 163841UL, +  167953UL, 172031UL, 176129UL, 180233UL, +  184321UL, 188417UL, 192529UL, 196613UL, +  200713UL, 204803UL, 208907UL, 212999UL, +  217111UL, 221197UL, 225287UL, 229393UL, +  233477UL, 237571UL, 241663UL, 245759UL, +  249857UL, 253951UL, 258061UL, 262147UL, +  270337UL, 278543UL, 286721UL, 294911UL, +  303119UL, 311299UL, 319489UL, 327689UL, +  335879UL, 344083UL, 352267UL, 360457UL, +  368647UL, 376837UL, 385027UL, 393241UL, +  401407UL, 409609UL, 417793UL, 425987UL, +  434179UL, 442367UL, 450563UL, 458789UL, +  466951UL, 475141UL, 483337UL, 491527UL, +  499711UL, 507907UL, 516127UL, 524287UL, +  540677UL, 557057UL, 573451UL, 589829UL, +  606223UL, 622603UL, 638977UL, 655373UL, +  671743UL, 688133UL, 704521UL, 720899UL, +  737279UL, 753677UL, 770047UL, 786431UL, +  802829UL, 819229UL, 835591UL, 851971UL, +  868369UL, 884743UL, 901133UL, 917503UL, +  933893UL, 950281UL, 966659UL, 983063UL, +  999431UL, 1015813UL, 1032191UL, 1048583UL, +  1081351UL, 1114111UL, 1146881UL, 1179649UL, +  1212427UL, 1245187UL, 1277957UL, 1310719UL, +  1343491UL, 1376257UL, 1409027UL, 1441807UL, +  1474559UL, 1507369UL, 1540109UL, 1572869UL, +  1605631UL, 1638431UL, 1671191UL, 1703941UL, +  1736711UL, 1769473UL, 1802239UL, 1835017UL, +  1867783UL, 1900543UL, 1933331UL, 1966079UL, +  1998881UL, 2031671UL, 2064389UL, 2097169UL, +  2162717UL, 2228243UL, 2293771UL, 2359303UL, +  2424833UL, 2490377UL, 2555911UL, 2621447UL, +  2686979UL, 2752513UL, 2818103UL, 2883593UL, +  2949119UL, 3014659UL, 3080237UL, 3145739UL, +  3211279UL, 3276799UL, 3342341UL, 3407881UL, +  3473419UL, 3538949UL, 3604481UL, 3670027UL, +  3735553UL, 3801097UL, 3866623UL, 3932167UL, +  3997723UL, 4063237UL, 4128767UL, 4194319UL, +  4325389UL, 4456451UL, 4587533UL, 4718617UL, +  4849687UL, 4980749UL, 5111833UL, 5242883UL, +  5373971UL, 5505023UL, 5636123UL, 5767169UL, +  5898253UL, 6029329UL, 6160391UL, 6291469UL, +  6422531UL, 6553621UL, 6684673UL, 6815749UL, +  6946817UL, 7077893UL, 7208977UL, 7340033UL, +  7471127UL, 7602187UL, 7733251UL, 7864331UL, +  7995391UL, 8126473UL, 8257537UL, 8388617UL, +  8650753UL, 8912921UL, 9175057UL, 9437189UL, +  9699331UL, 9961487UL, 10223617UL, 10485767UL, +  10747903UL, 11010059UL, 11272193UL, 11534351UL, +  11796503UL, 12058679UL, 12320773UL, 12582917UL, +  12845069UL, 13107229UL, 13369399UL, 13631489UL, +  13893637UL, 14155777UL, 14417927UL, 14680063UL, +  14942209UL, 15204391UL, 15466499UL, 15728681UL, +  15990791UL, 16252967UL, 16515073UL, 16777259UL, +  17301517UL, 17825791UL, 18350093UL, 18874367UL, +  19398727UL, 19922993UL, 20447239UL, 20971529UL, +  21495809UL, 22020127UL, 22544387UL, 23068673UL, +  23592967UL, 24117257UL, 24641543UL, 25165843UL, +  25690121UL, 26214401UL, 26738687UL, 27262997UL, +  27787267UL, 28311553UL, 28835857UL, 29360147UL, +  29884417UL, 30408713UL, 30933011UL, 31457287UL, +  31981567UL, 32505901UL, 33030163UL, 33554467UL, +  34603013UL, 35651593UL, 36700159UL, 37748743UL, +  38797379UL, 39845887UL, 40894481UL, 41943049UL, +  42991621UL, 44040253UL, 45088781UL, 46137359UL, +  47185967UL, 48234517UL, 49283083UL, 50331653UL, +  51380233UL, 52428841UL, 53477453UL, 54525979UL, +  55574567UL, 56623153UL, 57671683UL, 58720267UL, +  59768831UL, 60817411UL, 61865989UL, 62914619UL, +  63963149UL, 65011717UL, 66060311UL, 67108879UL, +  69206017UL, 71303171UL, 73400329UL, 75497479UL, +  77594641UL, 79691779UL, 81788929UL, 83886091UL, +  85983239UL, 88080389UL, 90177541UL, 92274737UL, +  94371863UL, 96469001UL, 98566147UL, 100663319UL, +  102760453UL, 104857601UL, 106954759UL, 109051903UL, +  111149057UL, 113246209UL, 115343383UL, 117440551UL, +  119537689UL, 121634819UL, 123731977UL, 125829139UL, +  127926307UL, 130023431UL, 132120577UL, 134217757UL, +  138412031UL, 142606357UL, 146800649UL, 150994979UL, +  155189249UL, 159383563UL, 163577857UL, 167772161UL, +  171966481UL, 176160779UL, 180355079UL, 184549429UL, +  188743679UL, 192937991UL, 197132293UL, 201326611UL, +  205520911UL, 209715199UL, 213909503UL, 218103811UL, +  222298127UL, 226492433UL, 230686721UL, 234881033UL, +  239075327UL, 243269639UL, 247463939UL, 251658263UL, +  255852593UL, 260046847UL, 264241223UL, 268435459UL, +  276824071UL, 285212677UL, 293601283UL, 301989917UL, +  310378501UL, 318767107UL, 327155743UL, 335544323UL, +  343932959UL, 352321547UL, 360710167UL, 369098771UL, +  377487361UL, 385876021UL, 394264613UL, 402653189UL, +  411041831UL, 419430419UL, 427819031UL, 436207619UL, +  444596227UL, 452984849UL, 461373449UL, 469762049UL, +  478150661UL, 486539323UL, 494927929UL, 503316511UL, +  511705091UL, 520093703UL, 528482347UL, 536870923UL, +  553648171UL, 570425377UL, 587202571UL, 603979799UL, +  620757019UL, 637534277UL, 654311423UL, 671088667UL, +  687865859UL, 704643083UL, 721420307UL, 738197503UL, +  754974721UL, 771751961UL, 788529191UL, 805306457UL, +  822083597UL, 838860817UL, 855638023UL, 872415239UL, +  889192471UL, 905969671UL, 922746883UL, 939524129UL, +  956301317UL, 973078537UL, 989855747UL, 1006632983UL, +  1023410207UL, 1040187403UL, 1056964619UL, 1073741827UL, +  1107296257UL, 1140850699UL, 1174405129UL, 1207959559UL, +  1241514007UL, 1275068423UL, 1308622877UL, 1342177283UL, +  1375731737UL, 1409286161UL, 1442840579UL, 1476395029UL, +  1509949451UL, 1543503881UL, 1577058331UL, 1610612741UL, +  1644167233UL, 1677721631UL, 1711276033UL, 1744830469UL, +  1778384921UL, 1811939329UL, 1845493777UL, 1879048201UL, +  1912602623UL, 1946157079UL, 1979711497UL, 2013265921UL, +  2046820351UL, 2080374797UL, 2113929217UL, 2147483647UL, +  2214592529UL, 2281701377UL, 2348810279UL, 2415919109UL, +  2483027969UL, 2550136861UL, 2617245707UL, 2684354591UL, +  2751463433UL, 2818572287UL, 2885681153UL, 2952790033UL, +  3019898923UL, 3087007751UL, 3154116619UL, 3221225473UL, +  3288334369UL, 3355443229UL, 3422552069UL, 3489660929UL, +  3556769813UL, 3623878669UL, 3690987527UL, 3758096383UL, +  3825205247UL, 3892314113UL, 3959422979UL, 4026531853UL, +  4093640729UL, 4160749601UL, 4227858463UL, 4294967311UL +  }; +  int shift=16; +  unsigned long cmp=0x1fffff; +  unsigned long x=num; +  int y=0; +  +  if(x<32) +  { +  static unsigned long lowprimes[32]={ +  3,3,3,3, +  5,5,7,7, +  11,11,11,11, +  13,13,17,17, +  17,17,19,19, +  23,23,23,23, +  29,29,29,29, +  29,29,31,31 +  }; +  return lowprimes[x]; +  } +  +  while(shift) +  { +  if(x>cmp) +  { +  y+=shift; +  x>>=shift; +  } +  shift>>=1; +  cmp>>=shift; +  } +  +  /* For really large numbers, produce a number which is not +  * a prime, but hopefully good for hash tables, although I +  * seriously doubt anybody will use hashtables larger than +  * 1<<32 entries... /Hubbe +  */ +  if(x>63) return num|7; +  +  return primes[(y<<5)|(x&31)]; + }