89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
/* $NetBSD: graph2.h,v 1.2 2021/01/07 16:03:08 joerg Exp $ */
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/*-
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Joerg Sonnenberger.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Implementation of common 2/3-graph routines:
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* - build a 2/3-graph with hash-pairs as edges
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* - check a 2/3-graph for acyclicness and compute an output order
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*
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* For each vertex in the 2/3-graph, the incidence lists need to kept.
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* Avoid storing the full list by just XORing the indices of the still
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* incident edges and the number of such edges as that's all the peeling
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* computation needs. This is inspired by:
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* Cache-Oblivious Peeling of Random Hypergraphs by Djamal Belazzougui,
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* Paolo Boldi, Giuseppe Ottaviano, Rossano Venturini, and Sebastiano
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* Vigna. https://arxiv.org/abs/1312.0526
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*
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* Unlike in the paper, we don't care about external storage and have
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* the edge list at hand all the time. As such, no ordering is necessary
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* and the vertices of the edge don't have to be copied.
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*
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* The core observation of the paper above is that for a degree of one,
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* the incident edge can be obtained directly.
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*/
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#ifndef GRAPH_SIZE
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#define GRAPH_SIZE 2
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#endif
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#define SIZED__(n, i) n ## i
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#define SIZED_(n, i) SIZED__(n, i)
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#define SIZED(n) SIZED_(n, GRAPH_SIZE)
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#define SIZED2__(n, i, m) n ## i ## m
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#define SIZED2_(n, i, m) SIZED2__(n, i, m)
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#define SIZED2(n) SIZED2_(graph, GRAPH_SIZE, n)
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struct SIZED(vertex) {
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uint32_t degree, edges;
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};
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struct SIZED(edge) {
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uint32_t vertices[GRAPH_SIZE];
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};
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struct SIZED(graph) {
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struct SIZED(vertex) *verts;
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struct SIZED(edge) *edges;
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uint32_t output_index;
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uint32_t *output_order;
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uint8_t *visited;
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uint32_t e, v;
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int hash_fudge;
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};
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void SIZED2(_setup)(struct SIZED(graph) *, uint32_t, uint32_t);
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void SIZED2(_free)(struct SIZED(graph) *);
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int SIZED2(_hash)(struct nbperf *, struct SIZED(graph) *);
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int SIZED2(_output_order)(struct SIZED(graph) *graph);
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