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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 | /* | |
35 | * function __ltpowerset | |
36 | * | |
37 | * parameters: | |
38 | * left powerset | |
39 | * right powerset | |
40 | * bitlength length of powerset | |
41 | * | |
42 | * returns: | |
43 | * int 1 .. left is proper subset of right | |
44 | * (excludes case where left == right) | |
45 | * 0 .. not | |
46 | * | |
47 | * abstract: | |
48 | * check if one powerset is included in another | |
49 | * | |
50 | */ | |
51 | int | |
52 | __ltpowerset (left, right, bitlength) | |
53 | SET_WORD *left; | |
54 | SET_WORD *right; | |
55 | unsigned long bitlength; | |
56 | { | |
57 | if (bitlength <= SET_CHAR_SIZE) | |
58 | { | |
59 | if ((*((SET_CHAR *)left) & *((SET_CHAR *)right)) | |
60 | != *((SET_CHAR *)left)) | |
61 | return 0; | |
62 | if (*((SET_CHAR *)left) != *((SET_CHAR *)right)) | |
63 | return 1; | |
64 | return 0; | |
65 | } | |
66 | else if (bitlength <= SET_SHORT_SIZE) | |
67 | { | |
68 | if ((*((SET_SHORT *)left) & *((SET_SHORT *)right)) | |
69 | != *((SET_SHORT *)left)) | |
70 | return 0; | |
71 | if (*((SET_SHORT *)left) != *((SET_SHORT *)right)) | |
72 | return 1; | |
73 | return 0; | |
74 | } | |
75 | else | |
76 | { | |
77 | SET_WORD *endp = left + BITS_TO_WORDS(bitlength); | |
78 | int all_equal = 1; /* assume all bits are equal */ | |
79 | ||
80 | while (left < endp) | |
81 | { | |
82 | if ((*right & *left) != *left) | |
83 | return 0; | |
84 | if (*left != *right) | |
85 | all_equal = 0; | |
86 | left++; | |
87 | right++; | |
88 | } | |
89 | if (left == endp && all_equal) /* exclude TRUE return for == case */ | |
90 | return 0; | |
91 | return 1; | |
92 | } | |
93 | } |