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Fish 'n' More 2
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fishmore-publicdomainlibraryvol.ii1991xetec.iso
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misc_utils
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yacc_419
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warshall.c,v
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1990-07-14
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110 lines
head 1.1;
branch ;
access ;
symbols ;
locks ; strict;
comment @ * @;
1.1
date 90.07.14.18.55.12; author loftus; state Exp;
branches ;
next ;
desc
@@
1.1
log
@Initial revision
@
text
@#include "defs.h"
transitive_closure(R, n)
unsigned *R;
int n;
{
register int rowsize;
register unsigned mask;
register unsigned *rowj;
register unsigned *rp;
register unsigned *rend;
register unsigned *ccol;
register unsigned *relend;
register unsigned *cword;
register unsigned *rowi;
rowsize = WORDSIZE(n);
relend = R + n*rowsize;
cword = R;
mask = 1;
rowi = R;
while (rowi < relend)
{
ccol = cword;
rowj = R;
while (rowj < relend)
{
if (*ccol & mask)
{
rp = rowi;
rend = rowj + rowsize;
while (rowj < rend)
*rowj++ |= *rp++;
}
else
{
rowj += rowsize;
}
ccol += rowsize;
}
mask <<= 1;
if (mask == 0)
{
mask = 1;
cword++;
}
rowi += rowsize;
}
}
reflexive_transitive_closure(R, n)
unsigned *R;
int n;
{
register int rowsize;
register unsigned mask;
register unsigned *rp;
register unsigned *relend;
transitive_closure(R, n);
rowsize = WORDSIZE(n);
relend = R + n*rowsize;
mask = 1;
rp = R;
while (rp < relend)
{
*rp |= mask;
mask <<= 1;
if (mask == 0)
{
mask = 1;
rp++;
}
rp += rowsize;
}
}
@