libchill/concatps.c

   1 /* Implement powerset-related runtime actions for CHILL.
   2    Copyright (C) 1992, 93, 1994 Free Software Foundation, Inc.
   3    Author: Bill Cox
   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
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, 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 "powerset.h"
  32
  33 extern void cause_exception (char *exname, char *file, int lineno);
  34
  35 /*
  36  * function __concatps
  37  *
  38  * parameters:
  39  *     OUT      - pointer to output PS
  40  *     LEFT     - pointer to left PS
  41  *     LEFTLEN  - length of left PS in bits
  42  *     RIGHT    - pointer to right PS
  43  *     RIGHTLEN - length of right PS in bits
  44  *
  45  * returns:
  46  *     void
  47  *
  48  * exceptions:
  49  *     none
  50  *
  51  * abstract:
  52  *     concatenates two powersets into the output powerset.
  53  *
  54  */
  55
  56 extern void
  57 __pscpy (SET_WORD      *dps,
  58          unsigned long  dbl,
  59          unsigned long  doffset,
  60          SET_WORD      *sps,
  61          unsigned long  sbl,
  62          unsigned long  start,
  63          unsigned long  length);
  64
  65 void
  66 __concatps (out, left, leftlen, right, rightlen)
  67      SET_WORD      *out;
  68      SET_WORD      *left;
  69      unsigned long  leftlen;
  70      SET_WORD      *right;
  71      unsigned long  rightlen;
  72 {
  73   /* allocated sizes for each set involved */
  74   unsigned long outall, leftall, rightall;
  75
  76   if (!out)
  77     {
  78       /* FIXME: cause an exception */
  79     }
  80   else if (leftlen == 0 || !left)
  81     {
  82       if (rightlen == 0 || !right)
  83         return;               /* no work to do */
  84       __pscpy (out, rightlen, (unsigned long)0,
  85                right, rightlen, (unsigned long)0, rightlen);
  86     }
  87   else if (rightlen == 0 || !right)
  88     {
  89       if (leftlen == 0 || !left)
  90         return;               /* no work to do */
  91       __pscpy (out, leftlen, (unsigned long)0,
  92                left, leftlen, (unsigned long)0, leftlen);
  93     }
  94   /* copy the left powerset into bits 0..leftlen - 1 */
  95   __pscpy (out, leftlen + rightlen, (unsigned long)0,
  96            left, leftlen, (unsigned long)0, leftlen);
  97
  98   /* copy the right powerset into bits leftlen..leftlen+rightlen-1 */
  99   __pscpy (out, leftlen + rightlen, leftlen,
 100            right, rightlen, (unsigned long)0, rightlen);
 101 }