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* src/warshall.c (TC, RTC): De-obsfucate (source reduced to 22% of

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what it was!).
* src/warshall.h: Remove accidental duplication of the content.
This commit is contained in:
Akim Demaille
2001-12-05 09:23:10 +00:00
parent 0ea80316a9
commit aaf7be2c4b
3 changed files with 32 additions and 103 deletions
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101
src/warshall.c
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@@ -1,5 +1,5 @@
/* Generate transitive closure of a matrix,
Copyright 1984, 1989, 2000 Free Software Foundation, Inc.
Copyright 1984, 1989, 2000, 2001 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
@@ -22,93 +22,40 @@
#include "system.h"
#include "warshall.h"
/* Given n by n matrix of bits R, modify its contents to be the
transive closure of what was given. */
/*-------------------------------------------------------------.
| Given n by n matrix of bits R, modify its contents to be the |
| transive closure of what was given. |
`-------------------------------------------------------------*/
#define R(Num) (unsigned *) ((char *) R + ((Num) * rowsize))
static void
TC (unsigned *R, int n)
{
int rowsize;
unsigned mask;
unsigned *rowj;
unsigned *rp;
unsigned *rend;
unsigned *ccol;
int rowsize = WORDSIZE (n) * sizeof (unsigned);
int i, j, k;
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);
}
for (i = 0; i < n; ++i)
for (j = 0; j < n; ++j)
if (BITISSET (R (i), j))
for (k = 0; k < rowsize; ++k)
if (BITISSET (R (i), k))
SETBIT (R (j), k);
}
/* Reflexive Transitive Closure. Same as TC
and then set all the bits on the diagonal of R. */
/*---------------------------------------------------------------.
| Reflexive Transitive Closure. Same as TC and then set all the |
| bits on the diagonal of R. |
`---------------------------------------------------------------*/
void
RTC (unsigned *R, int n)
{
int rowsize;
unsigned mask;
unsigned *rp;
unsigned *relend;
int rowsize = WORDSIZE (n) * sizeof (unsigned);
int i;
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);
}
TC (R, n);
for (i = 0; i < n; ++i)
SETBIT (R (i), i);
}