1 /* Implement POWERSET runtime actions for CHILL.
2 Copyright (C) 1992,1993 Free Software Foundation, Inc.
3 Author: Wilfried Moser, et al
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* As a special exception, if you link this library with other files,
22 some of which are compiled with GCC, to produce an executable,
23 this library does not by itself cause the resulting executable
24 to be covered by the GNU General Public License.
25 This exception does not however invalidate any other reasons why
26 the executable file might be covered by the GNU General Public License. */
33 extern void __cause_ex1 (char *exname
, char *file
, int lineno
);
36 * function __ffsetpowerset
40 * bitlength length of powerset
41 * minval set low bound
42 * filename caller's file name
43 * lineno caller's line number
46 * int enum value of lowest member of powerset
49 * "empty" if the set is empty
52 * Find first bit set in a powerset and return the corresponding value.
56 __ffsetpowerset (ps
, bitlength
, minval
, filename
, lineno
)
58 unsigned long bitlength
;
65 if (bitlength
<= SET_CHAR_SIZE
)
67 SET_CHAR cset
= *((SET_CHAR
*)ps
);
70 /* found a bit set .. calculate which */
71 for (bitno
= 0; bitno
< SET_CHAR_SIZE
; bitno
++)
72 if (GET_BIT_IN_CHAR (cset
, bitno
))
74 /* return its index */
75 return bitno
+ minval
;
78 else if (bitlength
<= SET_SHORT_SIZE
)
80 SET_SHORT sset
= *((SET_SHORT
*)ps
);
83 /* found a bit set .. calculate which */
84 for (bitno
= 0; bitno
< SET_SHORT_SIZE
; bitno
++)
85 if (GET_BIT_IN_SHORT (sset
, bitno
))
87 /* return its index */
88 return bitno
+ minval
;
91 else /* set composed of array of one or more WORDs */
94 SET_WORD
*endp
= ps
+ BITS_TO_WORDS(bitlength
);
97 /* FIXME: bitorder problems? */
98 for (cnt
= 0; p
< endp
; p
++, cnt
+= SET_WORD_SIZE
)
104 /* found a bit set .. calculate which */
105 for (bitno
= 0; bitno
< SET_WORD_SIZE
; bitno
++)
106 if (GET_BIT_IN_WORD (c
, bitno
))
108 /* return its index */
109 return cnt
+ bitno
+ minval
;
113 /* no bits found - raise exception */
114 __cause_ex1 ("empty", filename
, lineno
);