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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* As a special exception, if you link this library with other files,
  22    some of which are compiled with GCC, to produce an executable,
  23    this library does not by itself cause the resulting executable
  24    to be covered by the GNU General Public License.
  25    This exception does not however invalidate any other reasons why
  26    the executable file might be covered by the GNU General Public License.  */
  27
  28 #define __CHILL_LIB__
  29
  30 #include "powerset.h"
  31
  32 extern void cause_exception (char *exname, char *file, int lineno);
  33
  34 /*
  35  * function __concatps
  36  *
  37  * parameters:
  38  *     OUT      - pointer to output PS
  39  *     LEFT     - pointer to left PS
  40  *     LEFTLEN  - length of left PS in bits
  41  *     RIGHT    - pointer to right PS
  42  *     RIGHTLEN - length of right PS in bits
  43  *
  44  * returns:
  45  *     void
  46  *
  47  * exceptions:
  48  *     none
  49  *
  50  * abstract:
  51  *     concatenates two powersets into the output powerset.
  52  *
  53  */
  54
  55 extern void
  56 __pscpy (SET_WORD      *dps,
  57          unsigned long  dbl,
  58          unsigned long  doffset,
  59          SET_WORD      *sps,
  60          unsigned long  sbl,
  61          unsigned long  start,
  62          unsigned long  length);
  63
  64 void
  65 __concatps (out, left, leftlen, right, rightlen)
  66      SET_WORD      *out;
  67      SET_WORD      *left;
  68      unsigned long  leftlen;
  69      SET_WORD      *right;
  70      unsigned long  rightlen;
  71 {
  72   /* allocated sizes for each set involved */
  73   unsigned long outall, leftall, rightall;
  74
  75   if (!out)
  76     {
  77       /* FIXME: cause an exception */
  78     }
  79   else if (leftlen == 0 || !left)
  80     {
  81       if (rightlen == 0 || !right)
  82         return;               /* no work to do */
  83       __pscpy (out, rightlen, (unsigned long)0,
  84                right, rightlen, (unsigned long)0, rightlen);
  85     }
  86   else if (rightlen == 0 || !right)
  87     {
  88       if (leftlen == 0 || !left)
  89         return;               /* no work to do */
  90       __pscpy (out, leftlen, (unsigned long)0,
  91                left, leftlen, (unsigned long)0, leftlen);
  92     }
  93   /* copy the left powerset into bits 0..leftlen - 1 */
  94   __pscpy (out, leftlen + rightlen, (unsigned long)0,
  95            left, leftlen, (unsigned long)0, leftlen);
  96
  97   /* copy the right powerset into bits leftlen..leftlen+rightlen-1 */
  98   __pscpy (out, leftlen + rightlen, leftlen,
  99            right, rightlen, (unsigned long)0, rightlen);
 100 }