digitalmars.D.bugs - [Issue 9522] New: AA implementation needs no prime number of buckets
- d-bugmail puremagic.com (28/28) Feb 16 2013 http://d.puremagic.com/issues/...
http://d.puremagic.com/issues/show_bug.cgi?id=9522 Summary: AA implementation needs no prime number of buckets Product: D Version: D2 Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P2 Component: druntime AssignedTo: nobody puremagic.com ReportedBy: reachzach gmail.com --- Comment #0 from Zach the Mystic <reachzach gmail.com> 2013-02-16 09:09:57 PST --- Hash function expert Bob Jenkins' says specifically that a 'decent' hash function can distribute its keys to a power of 2 just as easily as to a prime number. He approves of the SuperFastHash algorithm used in druntime. There is therefore no need for the AA implementation to use a prime number of buckets for its tables. See: http://burtleburtle.net/bob/hash/hashfaq.html For his take on the current hash function used (which he approves of), see the sections "Paul Tsieh's Hash" and "My Hash" near the bottom of this article: http://burtleburtle.net/bob/hash/doobs.html This is the current AA implementation. See line 50 for unnecessary prime number listings: https://github.com/D-Programming-Language/druntime/blob/master/src/rt/aaA.d -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Feb 16 2013