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/* $OpenBSD: warshall.c,v 1.11 2014/03/13 01:18:22 tedu Exp $ */ |
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/* $NetBSD: warshall.c,v 1.4 1996/03/19 03:21:51 jtc Exp $ */ |
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/* |
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* Copyright (c) 1989 The Regents of the University of California. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Robert Paul Corbett. |
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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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* 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 the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT 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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#include "defs.h" |
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void transitive_closure(unsigned int *, int); |
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void |
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transitive_closure(unsigned int *R, int n) |
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{ |
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int rowsize; |
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unsigned int i; |
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unsigned int *rowj, *rp, *rend, *ccol, *relend, *cword, *rowi; |
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rowsize = WORDSIZE(n); |
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relend = R + n * rowsize; |
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cword = R; |
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i = 0; |
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rowi = R; |
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✓✓ |
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while (rowi < relend) { |
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ccol = cword; |
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rowj = R; |
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✓✓ |
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while (rowj < relend) { |
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✓✓ |
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if (*ccol & (1 << i)) { |
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rp = rowi; |
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rend = rowj + rowsize; |
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✓✓ |
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while (rowj < rend) |
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*rowj++ |= *rp++; |
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} else { |
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rowj += rowsize; |
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} |
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ccol += rowsize; |
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} |
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✓✓ |
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if (++i >= BITS_PER_WORD) { |
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i = 0; |
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cword++; |
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} |
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rowi += rowsize; |
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} |
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} |
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void |
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reflexive_transitive_closure(unsigned int *R, int n) |
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{ |
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int rowsize; |
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unsigned int i; |
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unsigned int *rp, *relend; |
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transitive_closure(R, n); |
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rowsize = WORDSIZE(n); |
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relend = R + n * rowsize; |
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i = 0; |
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rp = R; |
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✓✓ |
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while (rp < relend) { |
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*rp |= (1 << i); |
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✓✓ |
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if (++i >= BITS_PER_WORD) { |
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i = 0; |
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rp++; |
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} |
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rp += rowsize; |
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} |
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} |