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#ifndef __netmisc_H
#define __netmisc_H
* Copyright (c) 1999-2000 Stephen Williams (
* 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
* 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) && !defined(macintosh)
#ident "$Id: netmisc.h,v 1.7 2000/05/14 17:55:04 steve Exp $"
# include "netlist.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.
extern NetExpr*pad_to_width(NetExpr*expr, unsigned wid);
extern NetNet*pad_to_width(Design*des, const string&p, NetNet*n, unsigned w);
* This function chooses a nexus name for the link. The algorithm is
* such that any signal in the link will have the same nexus name, and
* signals that are not connected together will have a different nexus
* name.
extern string nexus_from_link(const Link*lnk);
* Check to see if the link has a constant value driven to it. If
* there is only a NetConst driving this pin, the return a pointer to
* that NetConst object. Also, return the index of the bit in that
* constant through the idx parameter.
extern NetConst* link_const_value(Link&pin, unsigned&idx);
* This local function returns true if all the the possible drivers of
* this link are constant. It will also return true if there are no
* drivers at all.
extern bool link_drivers_constant(const Link&lnk);
* This function returns the value of the constant driving this link,
* or Vz if there is no constant. The results of this function are
* only meaningful if link_drivers_constant(lnk) == true.
extern verinum::V driven_value(const Link&lnk);
* $Log: netmisc.h,v $
* Revision 1.7 2000/05/14 17:55:04 steve
* Support initialization of FF Q value.
* Revision 1.6 2000/05/07 04:37:56 steve
* Carry strength values from Verilog source to the
* pform and netlist for gates.
* Change vvm constants to use the driver_t to drive
* a constant value. This works better if there are
* multiple drivers on a signal.
* Revision 1.5 2000/04/20 00:28:03 steve
* Catch some simple identity compareoptimizations.
* Revision 1.4 2000/03/16 19:03:03 steve
* Revise the VVM backend to use nexus objects so that
* drivers and resolution functions can be used, and
* the t-vvm module doesn't need to write a zillion
* output functions.
* Revision 1.3 2000/02/23 02:56:55 steve
* Macintosh compilers do not support ident.
* Revision 1.2 2000/02/16 03:58:27 steve
* Fix up width matching in structural bitwise operators.
* Revision 1.1 1999/09/29 00:42:51 steve
* Allow expanding of additive operators.
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