d1e106f262
I've submitted this patch upstream, so apply this to contrib/ until a new version containing this change has been released. Reviewed By: jkim Differential Revision: https://reviews.freebsd.org/D26505
83 lines
1.1 KiB
C
83 lines
1.1 KiB
C
/* $Id: warshall.c,v 1.7 2010/06/06 22:48:51 tom Exp $ */
|
|
|
|
#include "defs.h"
|
|
|
|
static void
|
|
transitive_closure(unsigned *R, int n)
|
|
{
|
|
int rowsize;
|
|
unsigned i;
|
|
unsigned *rowj;
|
|
unsigned *rp;
|
|
unsigned *rend;
|
|
unsigned *ccol;
|
|
unsigned *relend;
|
|
unsigned *cword;
|
|
unsigned *rowi;
|
|
|
|
rowsize = WORDSIZE(n);
|
|
relend = R + n * rowsize;
|
|
|
|
cword = R;
|
|
i = 0;
|
|
rowi = R;
|
|
while (rowi < relend)
|
|
{
|
|
ccol = cword;
|
|
rowj = R;
|
|
|
|
while (rowj < relend)
|
|
{
|
|
if (*ccol & (1u << i))
|
|
{
|
|
rp = rowi;
|
|
rend = rowj + rowsize;
|
|
while (rowj < rend)
|
|
*rowj++ |= *rp++;
|
|
}
|
|
else
|
|
{
|
|
rowj += rowsize;
|
|
}
|
|
|
|
ccol += rowsize;
|
|
}
|
|
|
|
if (++i >= BITS_PER_WORD)
|
|
{
|
|
i = 0;
|
|
cword++;
|
|
}
|
|
|
|
rowi += rowsize;
|
|
}
|
|
}
|
|
|
|
void
|
|
reflexive_transitive_closure(unsigned *R, int n)
|
|
{
|
|
int rowsize;
|
|
unsigned i;
|
|
unsigned *rp;
|
|
unsigned *relend;
|
|
|
|
transitive_closure(R, n);
|
|
|
|
rowsize = WORDSIZE(n);
|
|
relend = R + n * rowsize;
|
|
|
|
i = 0;
|
|
rp = R;
|
|
while (rp < relend)
|
|
{
|
|
*rp |= (1u << i);
|
|
if (++i >= BITS_PER_WORD)
|
|
{
|
|
i = 0;
|
|
rp++;
|
|
}
|
|
|
|
rp += rowsize;
|
|
}
|
|
}
|