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pad_to_width.cc
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pad_to_width.cc
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/*
* Copyright (c) 1999 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: pad_to_width.cc,v 1.1 1999/09/29 00:42:51 steve Exp $"
#endif
# include "netlist.h"
# include "netmisc.h"
/*
* This funciton transforms an expression by padding the high bits
* with V0 until the expression has the desired width. This may mean
* not transforming the expression at all, if it is already wide
* enough.
*/
NetExpr*pad_to_width(NetExpr*expr, unsigned wid)
{
if (wid > expr->expr_width()) {
verinum pad(verinum::V0, wid - expr->expr_width());
NetEConst*co = new NetEConst(pad);
NetEConcat*cc = new NetEConcat(2);
cc->set(0, co);
cc->set(1, expr);
cc->set_width(wid);
expr = cc;
}
return expr;
}
/*
* $Log: pad_to_width.cc,v $
* Revision 1.1 1999/09/29 00:42:51 steve
* Allow expanding of additive operators.
*
*/