mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-12-03 08:44:23 +08:00
107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/* Implement POWERSET runtime actions for CHILL.
|
|
Copyright (C) 1992,1993 Free Software Foundation, Inc.
|
|
Author: Wilfried Moser, et al
|
|
|
|
This file is part of GNU CC.
|
|
|
|
GNU CC 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.
|
|
|
|
GNU CC 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 GNU CC; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
/* As a special exception, if you link this library with other files,
|
|
some of which are compiled with GCC, to produce an executable,
|
|
this library does not by itself cause the resulting executable
|
|
to be covered by the GNU General Public License.
|
|
This exception does not however invalidate any other reasons why
|
|
the executable file might be covered by the GNU General Public License. */
|
|
|
|
#define __CHILL_LIB__
|
|
|
|
#include <stdio.h>
|
|
#include "powerset.h"
|
|
|
|
|
|
/*
|
|
* function __cardpowerset
|
|
*
|
|
* parameters:
|
|
* ps powerset
|
|
* bitlength length of powerset
|
|
*
|
|
* returns:
|
|
* long number of set bits
|
|
*
|
|
* exceptions:
|
|
* none
|
|
*
|
|
* abstract:
|
|
* returns the number of set bit's in a powerset
|
|
*
|
|
*/
|
|
|
|
/* bit_count[I] is number of '1' bits in I. */
|
|
static
|
|
const unsigned char __four_bit_count[16] = {
|
|
0, 1, 1, 2,
|
|
1, 2, 2, 3,
|
|
1, 2, 2, 3,
|
|
2, 3, 3, 4 };
|
|
|
|
long
|
|
__cardpowerset (ps, bitlength)
|
|
SET_WORD *ps;
|
|
unsigned long bitlength;
|
|
{
|
|
unsigned long count = 0;
|
|
if (bitlength <= SET_CHAR_SIZE)
|
|
{
|
|
register SET_CHAR c = *((SET_CHAR *)ps);
|
|
/* count 4 bits at a time. */
|
|
while (c > 0)
|
|
{
|
|
count += __four_bit_count[c & 15];
|
|
c >>= 4;
|
|
}
|
|
return count;
|
|
}
|
|
else if (bitlength <= SET_SHORT_SIZE)
|
|
{
|
|
register SET_SHORT c = *((SET_SHORT *)ps);
|
|
/* count 4 bits at a time. */
|
|
while (c > 0)
|
|
{
|
|
count += __four_bit_count[c & 15];
|
|
c >>= 4;
|
|
}
|
|
return count;
|
|
}
|
|
else
|
|
{
|
|
register SET_WORD *p = ps;
|
|
SET_WORD *endp = p + BITS_TO_WORDS(bitlength);
|
|
|
|
while (p < endp)
|
|
{
|
|
register SET_WORD c = *p++;
|
|
/* count 4 bits at a time. */
|
|
while (c > 0)
|
|
{
|
|
count += __four_bit_count[c & 15];
|
|
c >>= 4;
|
|
}
|
|
}
|
|
return (count);
|
|
}
|
|
}
|