git://gcc.gnu.org / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 __ffsetclrpowerset | |
| 36 | * | |
| 37 | * parameters: | |
| 38 | * ps powerset | |
| 39 | * bitlength length of powerset | |
| 40 | * | |
| 41 | * returns: | |
| 42 | * int -1 .. nothing found | |
| 43 | * >=0 .. index of first true bit found | |
| 44 | * exceptions: | |
| 45 | * none | |
| 46 | */ | |
| 47 | ||
| 48 | int | |
| 49 | __ffsetclrpowerset (ps, bitlength, first_bit) | |
| 50 | SET_WORD *ps; | |
| 51 | unsigned long bitlength; | |
| 52 | int first_bit; | |
| 53 | { | |
| 54 | register int bitno; | |
| 55 | ||
| 56 | if (first_bit >= bitlength) | |
| 57 | return -1; | |
| 58 | ||
| 59 | #ifndef USE_CHARS | |
| 60 | if (bitlength <= SET_CHAR_SIZE) | |
| 61 | { | |
| 62 | for (bitno = first_bit; bitno < bitlength; bitno++) | |
| 63 | if (GET_BIT_IN_CHAR (*((SET_CHAR *)ps), bitno)) | |
| 64 | break; | |
| 65 | return bitno == bitlength ? -1 : bitno; | |
| 66 | } | |
| 67 | else if (bitlength <= SET_SHORT_SIZE) | |
| 68 | { | |
| 69 | for (bitno = first_bit; bitno < bitlength; bitno++) | |
| 70 | if (GET_BIT_IN_SHORT (*((SET_SHORT *)ps), bitno)) | |
| 71 | break; | |
| 72 | return bitno == bitlength ? -1 : bitno; | |
| 73 | } | |
| 74 | else | |
| 75 | #endif | |
| 76 | { | |
| 77 | unsigned int words_to_skip = (unsigned) first_bit / SET_WORD_SIZE; | |
| 78 | unsigned long cnt = words_to_skip * SET_WORD_SIZE; | |
| 79 | SET_WORD *p = ps + words_to_skip; | |
| 80 | SET_WORD *endp = ps + BITS_TO_WORDS(bitlength); | |
| 81 | SET_WORD c; | |
| 82 | first_bit = (unsigned) first_bit % (unsigned) SET_WORD_SIZE; | |
| 83 | ||
| 84 | c = *p++; | |
| 85 | if (c) | |
| 86 | { | |
| 87 | for (bitno = first_bit; bitno < SET_WORD_SIZE; bitno++) | |
| 88 | if (GET_BIT_IN_WORD(c, bitno)) | |
| 89 | goto found; | |
| 90 | } | |
| 91 | cnt += SET_WORD_SIZE; | |
| 92 | ||
| 93 | while (p < endp) | |
| 94 | { | |
| 95 | if ((c = *p++)) | |
| 96 | { | |
| 97 | /* found a bit set .. calculate which */ | |
| 98 | for (bitno = 0; bitno < SET_WORD_SIZE; bitno++) | |
| 99 | if (GET_BIT_IN_WORD(c, bitno)) | |
| 100 | goto found; | |
| 101 | } | |
| 102 | cnt += SET_WORD_SIZE; | |
| 103 | } | |
| 104 | return -1; | |
| 105 | found: | |
| 106 | bitno += cnt; | |
| 107 | return bitno >= bitlength ? -1 : bitno; | |
| 108 | } | |
| 109 | } |