1.\" $NetBSD: mi_vector_hash.3,v 1.2 2009/07/21 12:40:52 joerg Exp $ 2.\" 3.\" Copyright (c) 2009 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Joerg Sonnenberger. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd July 13, 2009 31.Dt MI_VECTOR_HASH 3 32.Os 33.Sh NAME 34.Nm mi_vector_hash 35.Nd fast 32bit hash functions 36.Sh LIBRARY 37.Lb libc 38.Sh SYNOPSIS 39.In stdlib.h 40.Ft void 41.Fn mi_vector_hash "const void * restrict key" "size_t len" \ 42 "uint32_t seed" "uint32_t hashes[3]" 43.Sh DESCRIPTION 44The 45.Nm 46function computes three 32-bit hash values of the memory area starting at 47.Fa key 48with length 49.Fa len . 50.Pp 51The output is identical on all architectures and only depends on 52.Fa key 53and 54.Fa seed . 55.Sh IMPLEMENTATION NOTES 56An optimised code path is used if 57.Fa key 58is aligned on a 32-bit boundary. 59.Sh HISTORY 60The 61.Nm 62function appeared in 63.Nx 6.0 . 64.Sh AUTHORS 65The hash function has been created by Bob Jenkins. 66