1/* Implement POWERSET runtime actions for CHILL. 2 Copyright (C) 1992,1993 Free Software Foundation, Inc. 3 Author: Wilfried Moser, et al 4 5This file is part of GNU CC. 6 7GNU CC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU CC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU CC; see the file COPYING. If not, write to 19the Free Software Foundation, 59 Temple Place - Suite 330, 20Boston, MA 02111-1307, USA. */ 21 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 29#define __CHILL_LIB__ 30 31#include <stdio.h> 32#include "powerset.h" 33 34extern void __cause_ex1 (char *exname, char *file, int lineno); 35 36/* 37 * function __ffsetpowerset 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 enum value of lowest member of powerset 48 * 49 * exceptions: 50 * "empty" if the set is empty 51 * 52 * abstract: 53 * Find first bit set in a powerset and return the corresponding value. 54 * 55 */ 56long 57__ffsetpowerset (ps, bitlength, minval, filename, lineno) 58 SET_WORD *ps; 59 unsigned long bitlength; 60 long minval; 61 char *filename; 62 int lineno; 63{ 64 unsigned long bitno; 65 66 if (bitlength <= SET_CHAR_SIZE) 67 { 68 SET_CHAR cset = *((SET_CHAR *)ps); 69 if (cset != 0) 70 { 71 /* found a bit set .. calculate which */ 72 for (bitno = 0; bitno < SET_CHAR_SIZE; bitno++) 73 if (GET_BIT_IN_CHAR (cset, bitno)) 74 break; 75 /* return its index */ 76 return bitno + minval; 77 } 78 } 79 else if (bitlength <= SET_SHORT_SIZE) 80 { 81 SET_SHORT sset = *((SET_SHORT *)ps); 82 if (sset != 0) 83 { 84 /* found a bit set .. calculate which */ 85 for (bitno = 0; bitno < SET_SHORT_SIZE; bitno++) 86 if (GET_BIT_IN_SHORT (sset, bitno)) 87 break; 88 /* return its index */ 89 return bitno + minval; 90 } 91 } 92 else /* set composed of array of one or more WORDs */ 93 { 94 SET_WORD *p = ps; 95 SET_WORD *endp = ps + BITS_TO_WORDS(bitlength); 96 unsigned long cnt; 97 98 /* FIXME: bitorder problems? */ 99 for (cnt = 0; p < endp; p++, cnt += SET_WORD_SIZE) 100 { 101 SET_WORD c = *p; 102 103 if (c) 104 { 105 /* found a bit set .. calculate which */ 106 for (bitno = 0; bitno < SET_WORD_SIZE; bitno++) 107 if (GET_BIT_IN_WORD (c, bitno)) 108 break; 109 /* return its index */ 110 return cnt + bitno + minval; 111 } 112 } 113 } 114 /* no bits found - raise exception */ 115 __cause_ex1 ("empty", filename, lineno); 116} 117