119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
/* Generate transitive closure of a matrix,
|
|
Copyright (C) 1984, 1989 Free Software Foundation, Inc.
|
|
|
|
This file is part of Bison, the GNU Compiler Compiler.
|
|
|
|
Bison is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
Bison is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Bison; see the file COPYING. If not, write to
|
|
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
|
|
#include <stdio.h>
|
|
#include "system.h"
|
|
#include "machine.h"
|
|
|
|
void RTC PARAMS((unsigned *, int));
|
|
|
|
|
|
/* given n by n matrix of bits R, modify its contents
|
|
to be the transive closure of what was given. */
|
|
|
|
static void
|
|
TC (unsigned *R, int n)
|
|
{
|
|
register int rowsize;
|
|
register unsigned mask;
|
|
register unsigned *rowj;
|
|
register unsigned *rp;
|
|
register unsigned *rend;
|
|
register unsigned *ccol;
|
|
|
|
unsigned *relend;
|
|
unsigned *cword;
|
|
unsigned *rowi;
|
|
|
|
rowsize = WORDSIZE(n) * sizeof(unsigned);
|
|
relend = (unsigned *) ((char *) 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 = (unsigned *) ((char *) rowj + rowsize);
|
|
|
|
while (rowj < rend)
|
|
*rowj++ |= *rp++;
|
|
}
|
|
else
|
|
{
|
|
rowj = (unsigned *) ((char *) rowj + rowsize);
|
|
}
|
|
|
|
ccol = (unsigned *) ((char *) ccol + rowsize);
|
|
}
|
|
|
|
mask <<= 1;
|
|
if (mask == 0)
|
|
{
|
|
mask = 1;
|
|
cword++;
|
|
}
|
|
|
|
rowi = (unsigned *) ((char *) rowi + rowsize);
|
|
}
|
|
}
|
|
|
|
|
|
/* Reflexive Transitive Closure. Same as TC
|
|
and then set all the bits on the diagonal of R. */
|
|
|
|
void
|
|
RTC (unsigned *R, int n)
|
|
{
|
|
register int rowsize;
|
|
register unsigned mask;
|
|
register unsigned *rp;
|
|
register unsigned *relend;
|
|
|
|
TC(R, n);
|
|
|
|
rowsize = WORDSIZE(n) * sizeof(unsigned);
|
|
relend = (unsigned *) ((char *) R + n*rowsize);
|
|
|
|
mask = 1;
|
|
rp = R;
|
|
while (rp < relend)
|
|
{
|
|
*rp |= mask;
|
|
|
|
mask <<= 1;
|
|
if (mask == 0)
|
|
{
|
|
mask = 1;
|
|
rp++;
|
|
}
|
|
|
|
rp = (unsigned *) ((char *) rp + rowsize);
|
|
}
|
|
}
|