307 lines
8.8 KiB
C
307 lines
8.8 KiB
C
/* $NetBSD: nbperf-bdz.c,v 1.5 2012/09/25 20:53:46 joerg Exp $ */
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/*-
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* Copyright (c) 2009, 2012 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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: nbperf-bdz.c,v 1.5 2012/09/25 20:53:46 joerg Exp $");
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#include <err.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "nbperf.h"
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/*
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* A full description of the algorithm can be found in:
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* "Simple and Space-Efficient Minimal Perfect Hash Functions"
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* by Botelho, Pagh and Ziviani, proceeedings of WADS 2007.
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*/
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/*
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* The algorithm is based on random, acyclic 3-graphs.
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*
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* Each edge in the represents a key. The vertices are the reminder of
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* the hash function mod n. n = cm with c > 1.23. This ensures that
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* an acyclic graph can be found with a very high probality.
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*
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* An acyclic graph has an edge order, where at least one vertex of
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* each edge hasn't been seen before. It is declares the first unvisited
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* vertex as authoritive for the edge and assigns a 2bit value to unvisited
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* vertices, so that the sum of all vertices of the edge modulo 4 is
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* the index of the authoritive vertex.
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*/
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#include "graph3.h"
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struct state {
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struct graph3 graph;
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uint32_t *visited;
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uint32_t *holes64k;
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uint16_t *holes64;
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uint8_t *g;
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uint32_t *result_map;
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};
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static void
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assign_nodes(struct state *state)
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{
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struct edge3 *e;
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size_t i, j;
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uint32_t t, r, holes;
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for (i = 0; i < state->graph.v; ++i)
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state->g[i] = 3;
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for (i = 0; i < state->graph.e; ++i) {
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j = state->graph.output_order[i];
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e = &state->graph.edges[j];
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if (!state->visited[e->left]) {
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r = 0;
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t = e->left;
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} else if (!state->visited[e->middle]) {
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r = 1;
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t = e->middle;
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} else {
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if (state->visited[e->right])
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abort();
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r = 2;
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t = e->right;
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}
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state->visited[t] = 2 + j;
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if (state->visited[e->left] == 0)
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state->visited[e->left] = 1;
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if (state->visited[e->middle] == 0)
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state->visited[e->middle] = 1;
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if (state->visited[e->right] == 0)
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state->visited[e->right] = 1;
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state->g[t] = (9 + r - state->g[e->left] - state->g[e->middle]
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- state->g[e->right]) % 3;
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}
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holes = 0;
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for (i = 0; i < state->graph.v; ++i) {
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if (i % 65536 == 0)
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state->holes64k[i >> 16] = holes;
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if (i % 64 == 0)
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state->holes64[i >> 6] = holes - state->holes64k[i >> 16];
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if (state->visited[i] > 1) {
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j = state->visited[i] - 2;
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state->result_map[j] = i - holes;
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}
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if (state->g[i] == 3)
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++holes;
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}
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}
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static void
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print_hash(struct nbperf *nbperf, struct state *state)
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{
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uint64_t sum;
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size_t i;
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fprintf(nbperf->output, "#include <stdlib.h>\n");
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fprintf(nbperf->output, "#include <strings.h>\n\n");
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fprintf(nbperf->output, "%suint32_t\n",
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nbperf->static_hash ? "static " : "");
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fprintf(nbperf->output,
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"%s(const void * __restrict key, size_t keylen)\n",
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nbperf->hash_name);
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fprintf(nbperf->output, "{\n");
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fprintf(nbperf->output,
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"\tstatic const uint64_t g1[%" PRId32 "] = {\n",
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(state->graph.v + 63) / 64);
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sum = 0;
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for (i = 0; i < state->graph.v; ++i) {
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sum |= ((uint64_t)state->g[i] & 1) << (i & 63);
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if (i % 64 == 63) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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sum = 0;
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}
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}
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if (i % 64 != 0) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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}
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fprintf(nbperf->output, "%s\t};\n", (i % 2 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint64_t g2[%" PRId32 "] = {\n",
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(state->graph.v + 63) / 64);
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sum = 0;
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for (i = 0; i < state->graph.v; ++i) {
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sum |= (((uint64_t)state->g[i] & 2) >> 1) << (i & 63);
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if (i % 64 == 63) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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sum = 0;
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}
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}
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if (i % 64 != 0) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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}
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fprintf(nbperf->output, "%s\t};\n", (i % 2 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint32_t holes64k[%" PRId32 "] = {\n",
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(state->graph.v + 65535) / 65536);
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for (i = 0; i < state->graph.v; i += 65536)
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fprintf(nbperf->output, "%s0x%08" PRIx32 ",%s",
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(i / 65536 % 4 == 0 ? "\t " : " "),
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state->holes64k[i >> 16],
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(i / 65536 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 65536 % 4 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint16_t holes64[%" PRId32 "] = {\n",
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(state->graph.v + 63) / 64);
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for (i = 0; i < state->graph.v; i += 64)
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fprintf(nbperf->output, "%s0x%04" PRIx32 ",%s",
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(i / 64 % 4 == 0 ? "\t " : " "),
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state->holes64[i >> 6],
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(i / 64 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 64 % 4 ? "\n" : ""));
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fprintf(nbperf->output, "\tuint64_t m;\n");
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fprintf(nbperf->output, "\tuint32_t idx, i, idx2;\n");
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fprintf(nbperf->output, "\tuint32_t h[%zu];\n\n", nbperf->hash_size);
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(*nbperf->print_hash)(nbperf, "\t", "key", "keylen", "h");
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fprintf(nbperf->output, "\n\th[0] = h[0] %% %" PRIu32 ";\n",
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state->graph.v);
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fprintf(nbperf->output, "\th[1] = h[1] %% %" PRIu32 ";\n",
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state->graph.v);
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fprintf(nbperf->output, "\th[2] = h[2] %% %" PRIu32 ";\n",
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state->graph.v);
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fprintf(nbperf->output,
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"\tidx = 9 + ((g1[h[0] >> 6] >> (h[0] & 63)) &1)"
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"\t + ((g1[h[1] >> 6] >> (h[1] & 63)) & 1)"
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"\t + ((g1[h[2] >> 6] >> (h[2] & 63)) & 1)"
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"\t - ((g2[h[0] >> 6] >> (h[0] & 63)) & 1)"
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"\t - ((g2[h[1] >> 6] >> (h[1] & 63)) & 1)"
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"\t - ((g2[h[2] >> 6] >> (h[2] & 63)) & 1);"
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);
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fprintf(nbperf->output,
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"\tidx = h[idx %% 3];\n");
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fprintf(nbperf->output,
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"\tidx2 = idx - holes64[idx >> 6] - holes64k[idx >> 16];\n"
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"\tidx2 -= popcount64(g1[idx >> 6] & g2[idx >> 6]\n"
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"\t & (((uint64_t)1 << idx) - 1));\n"
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"\treturn idx2;");
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fprintf(nbperf->output, "}\n");
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if (nbperf->map_output != NULL) {
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for (i = 0; i < state->graph.e; ++i)
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fprintf(nbperf->map_output, "%" PRIu32 "\n",
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state->result_map[i]);
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}
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}
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int
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bdz_compute(struct nbperf *nbperf)
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{
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struct state state;
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int retval = -1;
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uint32_t v, e;
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if (nbperf->c == 0)
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nbperf->c = 1.24;
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if (nbperf->c < 1.24)
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errx(1, "The argument for option -c must be at least 1.24");
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if (nbperf->hash_size < 3)
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errx(1, "The hash function must generate at least 3 values");
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(*nbperf->seed_hash)(nbperf);
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e = nbperf->n;
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v = nbperf->c * nbperf->n;
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if (1.24 * nbperf->n > v)
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++v;
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if (v < 10)
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v = 10;
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graph3_setup(&state.graph, v, e);
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state.holes64k = calloc(sizeof(uint32_t), (v + 65535) / 65536);
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state.holes64 = calloc(sizeof(uint16_t), (v + 63) / 64 );
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state.g = calloc(sizeof(uint32_t), v | 63);
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state.visited = calloc(sizeof(uint32_t), v);
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state.result_map = calloc(sizeof(uint32_t), e);
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if (state.holes64k == NULL || state.holes64 == NULL ||
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state.g == NULL || state.visited == NULL ||
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state.result_map == NULL)
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err(1, "malloc failed");
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if (graph3_hash(nbperf, &state.graph))
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goto failed;
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if (graph3_output_order(&state.graph))
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goto failed;
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assign_nodes(&state);
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print_hash(nbperf, &state);
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retval = 0;
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failed:
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graph3_free(&state.graph);
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free(state.visited);
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free(state.g);
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free(state.holes64k);
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free(state.holes64);
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free(state.result_map);
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return retval;
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}
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