diff lib/gl_anyhash_primes.h @ 39993:9f23dbd05922

linkedhash-set: New module. * lib/gl_linkedhash_set.h: New file. * lib/gl_linkedhash_set.c: New file. * lib/gl_anyhash_set1.h: New file, based on lib/gl_anyhash_list1.h. * lib/gl_anyhash_set2.h: New file, based on lib/gl_anyhash_list2.h. * lib/gl_anyhash_primes.h: New file, extracted from lib/gl_anyhash_list2.h. * lib/gl_anyhash_list2.h: Include it. (primes, next_prime): Remove definitions. * modules/linkedhash-set: New file. * modules/avltreehash-list (Files): Add lib/gl_anyhash_primes.h. (Makefile.am): Add gl_anyhash_primes.h to lib_SOURCES. * modules/linkedhash-list (Files): Add lib/gl_anyhash_primes.h. (Makefile.am): Add gl_anyhash_primes.h to lib_SOURCES. * modules/rbtreehash-list (Files): Add lib/gl_anyhash_primes.h. (Makefile.am): Add gl_anyhash_primes.h to lib_SOURCES.
author Bruno Haible <bruno@clisp.org>
date Tue, 04 Dec 2018 00:53:12 +0100
parents
children b06060465f09
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/gl_anyhash_primes.h	Tue Dec 04 00:53:12 2018 +0100
@@ -0,0 +1,87 @@
+/* Table of primes, for use by hash tables.
+   Copyright (C) 2006, 2009-2018 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2006.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Array of primes, approximately in steps of factor 1.2.
+   This table was computed by executing the Common Lisp expression
+     (dotimes (i 244) (format t "nextprime(~D)~%" (ceiling (expt 1.2d0 i))))
+   and feeding the result to PARI/gp.  */
+static const size_t primes[] =
+  {
+    11, 13, 17, 19, 23, 29, 37, 41, 47, 59, 67, 83, 97, 127, 139, 167, 199,
+    239, 293, 347, 419, 499, 593, 709, 853, 1021, 1229, 1471, 1777, 2129, 2543,
+    3049, 3659, 4391, 5273, 6323, 7589, 9103, 10937, 13109, 15727, 18899,
+    22651, 27179, 32609, 39133, 46957, 56359, 67619, 81157, 97369, 116849,
+    140221, 168253, 201907, 242309, 290761, 348889, 418667, 502409, 602887,
+    723467, 868151, 1041779, 1250141, 1500181, 1800191, 2160233, 2592277,
+    3110741, 3732887, 4479463, 5375371, 6450413, 7740517, 9288589, 11146307,
+    13375573, 16050689, 19260817, 23112977, 27735583, 33282701, 39939233,
+    47927081, 57512503, 69014987, 82818011, 99381577, 119257891, 143109469,
+    171731387, 206077643, 247293161, 296751781, 356102141, 427322587,
+    512787097, 615344489, 738413383, 886096061, 1063315271, 1275978331,
+    1531174013, 1837408799, 2204890543UL, 2645868653UL, 3175042391UL,
+    3810050851UL,
+#if SIZE_MAX > 4294967295UL
+    4572061027UL, 5486473229UL, 6583767889UL, 7900521449UL, 9480625733UL,
+    11376750877UL, 13652101063UL, 16382521261UL, 19659025513UL, 23590830631UL,
+    28308996763UL, 33970796089UL, 40764955463UL, 48917946377UL, 58701535657UL,
+    70441842749UL, 84530211301UL, 101436253561UL, 121723504277UL,
+    146068205131UL, 175281846149UL, 210338215379UL, 252405858521UL,
+    302887030151UL, 363464436191UL, 436157323417UL, 523388788231UL,
+    628066545713UL, 753679854847UL, 904415825857UL, 1085298991109UL,
+    1302358789181UL, 1562830547009UL, 1875396656429UL, 2250475987709UL,
+    2700571185239UL, 3240685422287UL, 3888822506759UL, 4666587008147UL,
+    5599904409713UL, 6719885291641UL, 8063862349969UL, 9676634819959UL,
+    11611961783951UL, 13934354140769UL, 16721224968907UL, 20065469962669UL,
+    24078563955191UL, 28894276746229UL, 34673132095507UL, 41607758514593UL,
+    49929310217531UL, 59915172260971UL, 71898206713183UL, 86277848055823UL,
+    103533417666967UL, 124240101200359UL, 149088121440451UL, 178905745728529UL,
+    214686894874223UL, 257624273849081UL, 309149128618903UL, 370978954342639UL,
+    445174745211143UL, 534209694253381UL, 641051633104063UL, 769261959724877UL,
+    923114351670013UL, 1107737222003791UL, 1329284666404567UL,
+    1595141599685509UL, 1914169919622551UL, 2297003903547091UL,
+    2756404684256459UL, 3307685621107757UL, 3969222745329323UL,
+    4763067294395177UL, 5715680753274209UL, 6858816903929113UL,
+    8230580284714831UL, 9876696341657791UL, 11852035609989371UL,
+    14222442731987227UL, 17066931278384657UL, 20480317534061597UL,
+    24576381040873903UL, 29491657249048679UL, 35389988698858471UL,
+    42467986438630267UL, 50961583726356109UL, 61153900471627387UL,
+    73384680565952851UL, 88061616679143347UL, 105673940014972061UL,
+    126808728017966413UL, 152170473621559703UL, 182604568345871671UL,
+    219125482015045997UL, 262950578418055169UL, 315540694101666193UL,
+    378648832921999397UL, 454378599506399233UL, 545254319407679131UL,
+    654305183289214771UL, 785166219947057701UL, 942199463936469157UL,
+    1130639356723763129UL, 1356767228068515623UL, 1628120673682218619UL,
+    1953744808418662409UL, 2344493770102394881UL, 2813392524122873857UL,
+    3376071028947448339UL, 4051285234736937517UL, 4861542281684325481UL,
+    5833850738021191727UL, 7000620885625427969UL, 8400745062750513217UL,
+    10080894075300616261UL, 12097072890360739951UL, 14516487468432885797UL,
+    17419784962119465179UL,
+#endif
+    SIZE_MAX /* sentinel, to ensure the search terminates */
+  };
+
+/* Return a suitable prime >= ESTIMATE.  */
+static size_t
+next_prime (size_t estimate)
+{
+  size_t i;
+
+  for (i = 0; i < sizeof (primes) / sizeof (primes[0]); i++)
+    if (primes[i] >= estimate)
+      return primes[i];
+  return SIZE_MAX; /* not a prime, but better than nothing */
+}