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b79f73df JL |
1 | /* Implement POWERSET runtime actions for CHILL. |
2 | Copyright (C) 1992,1993 Free Software Foundation, Inc. | |
3 | Author: Wilfried Moser, et al | |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
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) | |
10 | any later version. | |
11 | ||
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. | |
16 | ||
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 | |
201853b4 JL |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b79f73df | 21 | |
502b941f JL |
22 | /* As a special exception, if you link this library with other files, |
23 | some of which are compiled with GCC, to produce an executable, | |
24 | this library does not by itself cause the resulting executable | |
25 | to be covered by the GNU General Public License. | |
26 | This exception does not however invalidate any other reasons why | |
27 | the executable file might be covered by the GNU General Public License. */ | |
28 | ||
b79f73df JL |
29 | #define __CHILL_LIB__ |
30 | ||
b79f73df JL |
31 | #include <stdio.h> |
32 | #include "powerset.h" | |
33 | ||
34 | extern void __cause_ex1 (char *exname, char *file, int lineno); | |
35 | ||
36 | /* | |
37 | * function __flsetpowerset | |
38 | * | |
39 | * parameters: | |
40 | * ps powerset | |
41 | * bitlength length of powerset | |
42 | * minval set low bound | |
43 | * filename caller's file name | |
44 | * lineno caller's line number | |
45 | * | |
46 | * returns: | |
47 | * int largest enumeration value | |
48 | * exceptions: | |
49 | * "empty" if set is empty | |
50 | * | |
51 | * abstract: | |
52 | * Find last bit set in a powerset and return the corresponding value. | |
53 | * | |
54 | */ | |
55 | long | |
56 | __flsetpowerset (ps, bitlength, minval, filename, lineno) | |
57 | SET_WORD *ps; | |
58 | unsigned long bitlength; | |
59 | long minval; | |
60 | char *filename; | |
61 | int lineno; | |
62 | { | |
63 | unsigned long bitno; | |
64 | ||
65 | if (bitlength <= SET_CHAR_SIZE) | |
66 | { | |
67 | SET_CHAR cset = *((SET_CHAR *)ps); | |
68 | if (cset != 0) | |
69 | { | |
70 | /* found a bit set .. calculate which */ | |
71 | for (bitno = SET_CHAR_SIZE; bitno >= 1; bitno--) | |
72 | if (GET_BIT_IN_CHAR (cset, bitno - 1)) | |
73 | break; | |
74 | /* return its index */ | |
75 | return bitno + minval - 1; | |
76 | } | |
77 | } | |
78 | else if (bitlength <= SET_SHORT_SIZE) | |
79 | { | |
80 | SET_SHORT sset = *((SET_SHORT *)ps); | |
81 | if (sset != 0) | |
82 | { | |
83 | /* found a bit set .. calculate which */ | |
84 | for (bitno = SET_SHORT_SIZE; bitno >= 1; bitno--) | |
85 | if (GET_BIT_IN_SHORT (sset, bitno - 1)) | |
86 | break; | |
87 | /* return its index */ | |
88 | return bitno + minval - 1; | |
89 | } | |
90 | } | |
91 | else /* set composed of array of one or more WORDs */ | |
92 | { | |
93 | SET_WORD *endp = ps; | |
94 | SET_WORD *p = ps + BITS_TO_WORDS(bitlength) - 1; | |
95 | unsigned long cnt; | |
96 | ||
97 | /* FIXME: bitorder problems? */ | |
98 | for (cnt = ((bitlength - 1) / SET_WORD_SIZE) * SET_WORD_SIZE; | |
99 | p >= endp; p--, cnt -= SET_WORD_SIZE) | |
100 | { | |
101 | SET_WORD c = *p; | |
102 | if (c) | |
103 | { | |
104 | /* found a bit set .. calculate which */ | |
105 | for (bitno = SET_WORD_SIZE; bitno >= 1; bitno--) | |
106 | if (GET_BIT_IN_WORD (c, bitno - 1)) | |
107 | break; | |
108 | return cnt + bitno + minval - 1; | |
109 | } | |
110 | } | |
111 | } | |
112 | /* no bits found - raise exception */ | |
113 | __cause_ex1 ("empty", filename, lineno); | |
114 | } |