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Unlink z constants from nets.

This commit is contained in:
steve 2000-07-25 02:55:13 +00:00
parent 53489e6abe
commit cb7b1b6c94
1 changed files with 19 additions and 1 deletions
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20
cprop.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: cprop.cc,v 1.13 2000/07/15 05:13:43 steve Exp $"
#ident "$Id: cprop.cc,v 1.14 2000/07/25 02:55:13 steve Exp $"
#endif
# include "netlist.h"
@ -316,6 +316,21 @@ struct cprop_dc_functor : public functor_t {
void cprop_dc_functor::lpm_const(Design*des, NetConst*obj)
{
// 'bz constant values drive high impedance to whatever is
// connected to it. In otherwords, it is a noop.
{ unsigned tmp = 0;
for (unsigned idx = 0 ; idx < obj->pin_count() ; idx += 1)
if (obj->value(idx) == verinum::Vz) {
obj->pin(idx).unlink();
tmp += 1;
}
if (tmp == obj->pin_count()) {
delete obj;
return;
}
}
// If there are any links that take input, the constant is
// used structurally somewhere.
for (unsigned idx = 0 ; idx < obj->pin_count() ; idx += 1)
@ -363,6 +378,9 @@ void cprop(Design*des)
/*
* $Log: cprop.cc,v $
* Revision 1.14 2000/07/25 02:55:13 steve
* Unlink z constants from nets.
*
* Revision 1.13 2000/07/15 05:13:43 steve
* Detect muxing Vz as a bufufN.
*