87 lines
1.3 KiB
C
87 lines
1.3 KiB
C
#ifndef lint
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static char rcsid[] = "$Id: warshall.c,v 1.3 1993/08/02 17:56:52 mycroft Exp $";
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#endif /* not lint */
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#include "defs.h"
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transitive_closure(R, n)
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unsigned *R;
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int n;
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{
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register int rowsize;
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register unsigned i;
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register unsigned *rowj;
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register unsigned *rp;
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register unsigned *rend;
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register unsigned *ccol;
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register unsigned *relend;
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register unsigned *cword;
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register unsigned *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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while (rowi < relend)
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{
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ccol = cword;
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rowj = R;
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while (rowj < relend)
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{
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if (*ccol & (1 << i))
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{
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rp = rowi;
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rend = rowj + rowsize;
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while (rowj < rend)
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*rowj++ |= *rp++;
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}
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else
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{
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rowj += rowsize;
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}
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ccol += rowsize;
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}
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if (++i >= BITS_PER_WORD)
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{
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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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reflexive_transitive_closure(R, n)
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unsigned *R;
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int n;
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{
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register int rowsize;
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register unsigned i;
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register unsigned *rp;
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register unsigned *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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while (rp < relend)
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{
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*rp |= (1 << i);
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if (++i >= BITS_PER_WORD)
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{
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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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}
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