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links to root inputs are not constant.

This commit is contained in:
steve 2001-02-16 03:27:07 +00:00
parent 43ddd97426
commit d3bff8a451
1 changed files with 23 additions and 1 deletions
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24
link_const.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/ */
#if !defined(WINNT) && !defined(macintosh) #if !defined(WINNT) && !defined(macintosh)
#ident "$Id: link_const.cc,v 1.7 2000/11/20 01:41:12 steve Exp $" #ident "$Id: link_const.cc,v 1.8 2001/02/16 03:27:07 steve Exp $"
#endif #endif
# include "netlist.h" # include "netlist.h"
@ -35,12 +35,31 @@ bool link_drivers_constant(const Link&lnk)
for (const Link*cur = nex->first_nlink() for (const Link*cur = nex->first_nlink()
; cur ; cur = cur->next_nlink()) { ; cur ; cur = cur->next_nlink()) {
const NetNet*sig;
if (cur == &lnk) if (cur == &lnk)
continue; continue;
if (cur->get_dir() == Link::INPUT) if (cur->get_dir() == Link::INPUT)
continue; continue;
/* If this is an input or input port of a root module,
then the is probably not a constant value. I
certainly don't know what the value is, anyhow. */
if (sig = dynamic_cast<const NetNet*>(cur->get_obj())) do {
if (sig->port_type() == NetNet::NOT_A_PORT)
break;
if (sig->port_type() == NetNet::POUTPUT)
break;
if (sig->scope()->parent())
break;
flag = false;
} while(0);
/* If the link is PASSIVE then it doesn't count as a /* If the link is PASSIVE then it doesn't count as a
driver if its initial value is Vz. This is pertinant driver if its initial value is Vz. This is pertinant
because REGs are PASSIVE but can receive values from because REGs are PASSIVE but can receive values from
@ -95,6 +114,9 @@ verinum::V driven_value(const Link&lnk)
/* /*
* $Log: link_const.cc,v $ * $Log: link_const.cc,v $
* Revision 1.8 2001/02/16 03:27:07 steve
* links to root inputs are not constant.
*
* Revision 1.7 2000/11/20 01:41:12 steve * Revision 1.7 2000/11/20 01:41:12 steve
* Whoops, return the calculated constant value rom driven_value. * Whoops, return the calculated constant value rom driven_value.
* *