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Change case compare from logic to an LPM node.

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steve
2005-01-22 01:06:55 +00:00
parent b86fdd6bbc
commit e28636776a
12 changed files with 250 additions and 115 deletions
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elab_net.cc
+14 -37
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 1999-2004 Stephen Williams ([email protected])
* Copyright (c) 1999-2005 Stephen Williams ([email protected])
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
@@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: elab_net.cc,v 1.142 2005/01/16 04:20:32 steve Exp $"
#ident "$Id: elab_net.cc,v 1.143 2005/01/22 01:06:55 steve Exp $"
#endif
# include "config.h"
@@ -633,44 +633,18 @@ NetNet* PEBinary::elaborate_net_cmp_(Design*des, NetScope*scope,
}
case 'E': // Case equals (===)
case 'N': // Case equals (!==)
// The comparison generates gates to bitwise compare
// each pair, and AND all the comparison results.
#if 0
gate = new NetLogic(scope, scope->local_symbol(),
1+dwidth,
(op_ == 'E')? NetLogic::AND : NetLogic::NAND, 1);
gate = new NetCaseCmp(scope, scope->local_symbol(), dwidth);
connect(gate->pin(0), osig->pin(0));
for (unsigned idx = 0 ; idx < dwidth ; idx += 1) {
NetCaseCmp*cmp = new NetCaseCmp(scope,
scope->local_symbol());
if (idx < lsig->pin_count())
connect(cmp->pin(1), lsig->pin(idx));
else
connect(cmp->pin(1), padbit->pin(0));
if (idx < rsig->pin_count())
connect(cmp->pin(2), rsig->pin(idx));
else
connect(cmp->pin(2), padbit->pin(0));
connect(cmp->pin(0), gate->pin(idx+1));
des->add_node(cmp);
// Attach a label to this intermediate wire
NetNet*tmp = new NetNet(scope, scope->local_symbol(),
NetNet::WIRE);
tmp->local_flag(true);
connect(cmp->pin(0), tmp->pin(0));
}
#else
cerr << get_line() << ": internal error: Forgot how to "
<< "elab_net === operators." << endl;
des->errors += 1;
#endif
connect(gate->pin(1), lsig->pin(0));
connect(gate->pin(2), rsig->pin(0));
break;
case 'N': // Case equals (!==)
cerr << get_line() << ": internal error: "
<< "Forgot how to elaborate !==." << endl;
des->errors += 1;
gate = 0;
break;
case 'e': // ==
@@ -2482,6 +2456,9 @@ NetNet* PEUnary::elaborate_net(Design*des, NetScope*scope,
/*
* $Log: elab_net.cc,v $
* Revision 1.143 2005/01/22 01:06:55 steve
* Change case compare from logic to an LPM node.
*
* Revision 1.142 2005/01/16 04:20:32 steve
* Implement LPM_COMPARE nodes as two-input vector functors.
*