117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
/*
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* Copyright (c) 2001-2003 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CVS_IDENT
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#ident "$Id: netmisc.cc,v 1.7 2004/02/18 17:11:57 steve Exp $"
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#endif
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# include "config.h"
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# include "netlist.h"
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# include "netmisc.h"
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# include "PExpr.h"
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NetNet* add_to_net(Design*des, NetNet*sig, long val)
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{
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if (val == 0)
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return sig;
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NetScope*scope = sig->scope();
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unsigned long abs_val = (val >= 0)? val : (-val);
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unsigned width = sig->pin_count();
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verinum val_v (abs_val, width);
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NetConst*val_c = new NetConst(scope, scope->local_symbol(), val_v);
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NetNet*val_s = new NetNet(scope, scope->local_symbol(),
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NetNet::IMPLICIT, width);
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val_s->local_flag(true);
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NetNet*res = new NetNet(scope, scope->local_symbol(),
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NetNet::IMPLICIT, width);
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res->local_flag(true);
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NetAddSub*add = new NetAddSub(scope, scope->local_symbol(), width);
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for (unsigned idx = 0 ; idx < width ; idx += 1)
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connect(sig->pin(idx), add->pin_DataA(idx));
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for (unsigned idx = 0 ; idx < width ; idx += 1)
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connect(val_c->pin(idx), add->pin_DataB(idx));
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for (unsigned idx = 0 ; idx < width ; idx += 1)
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connect(val_s->pin(idx), add->pin_DataB(idx));
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for (unsigned idx = 0 ; idx < width ; idx += 1)
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connect(res->pin(idx), add->pin_Result(idx));
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if (val < 0)
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add->attribute("LPM_Direction", verinum("SUB"));
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else
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add->attribute("LPM_Direction", verinum("ADD"));
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des->add_node(add);
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des->add_node(val_c);
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return res;
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}
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NetExpr* elab_and_eval(Design*des, NetScope*scope, const PExpr*pe)
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{
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NetExpr*tmp = pe->elaborate_expr(des, scope);
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if (tmp == 0)
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return 0;
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if (NetExpr*tmp2 = tmp->eval_tree()) {
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delete tmp;
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tmp = tmp2;
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}
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return tmp;
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}
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/*
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* $Log: netmisc.cc,v $
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* Revision 1.7 2004/02/18 17:11:57 steve
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* Use perm_strings for named langiage items.
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*
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* Revision 1.6 2003/03/06 00:28:42 steve
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* All NetObj objects have lex_string base names.
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*
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* Revision 1.5 2003/02/26 01:29:24 steve
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* LPM objects store only their base names.
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*
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* Revision 1.4 2002/08/31 03:48:50 steve
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* Fix reverse bit ordered bit select in continuous assignment.
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*
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* Revision 1.3 2002/08/12 01:35:00 steve
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* conditional ident string using autoconfig.
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*
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* Revision 1.2 2001/07/25 03:10:49 steve
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* Create a config.h.in file to hold all the config
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* junk, and support gcc 3.0. (Stephan Boettcher)
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*
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* Revision 1.1 2001/02/11 02:15:52 steve
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* Add the netmisc.cc source file.
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*
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*/
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