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Only build a mux as wide as can be selected.

This commit is contained in:
steve 2003-09-03 04:29:18 +00:00
parent af806ed9c3
commit ca0a9faa90
1 changed files with 14 additions and 1 deletions
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15
elab_net.cc
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@ -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 1.116 2003/08/28 04:11:17 steve Exp $"
#ident "$Id: elab_net.cc,v 1.117 2003/09/03 04:29:18 steve Exp $"
#endif
# include "config.h"
@ -1258,6 +1258,16 @@ NetNet* PEIdent::elaborate_net_bitmux_(Design*des, NetScope*scope,
NetNet*sel = msb_->elaborate_net(des, scope, 0, 0, 0, 0);
unsigned sig_width = sig->pin_count();
/* Detect the case of some bits not accessible by the given
select. Figure out how many bits can be selected by the
full range of the select, and limit the input of the mux to
that width. */
{ unsigned max_width_by_sel = 1 << sel->pin_count();
if (sig_width > max_width_by_sel)
sig_width = max_width_by_sel;
}
NetMux*mux = new NetMux(scope, scope->local_symbol(), 1,
sig_width, sel->pin_count());
@ -2326,6 +2336,9 @@ NetNet* PEUnary::elaborate_net(Design*des, NetScope*scope,
/*
* $Log: elab_net.cc,v $
* Revision 1.117 2003/09/03 04:29:18 steve
* Only build a mux as wide as can be selected.
*
* Revision 1.116 2003/08/28 04:11:17 steve
* Spelling patch.
*