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Donot elide FF that has set or clr connections.

This commit is contained in:
steve 2003-10-31 02:40:06 +00:00
parent 5aadc310f7
commit fad43d78b0
1 changed files with 10 additions and 3 deletions
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13
cprop.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
*/ */
#ifdef HAVE_CVS_IDENT #ifdef HAVE_CVS_IDENT
#ident "$Id: cprop.cc,v 1.44 2003/04/25 05:06:32 steve Exp $" #ident "$Id: cprop.cc,v 1.45 2003/10/31 02:40:06 steve Exp $"
#endif #endif
# include "config.h" # include "config.h"
@ -277,10 +277,14 @@ void cprop_functor::lpm_ff(Design*des, NetFF*obj)
{ {
// Look for and count unlinked FF outputs. Note that if the // Look for and count unlinked FF outputs. Note that if the
// Data and Q pins are connected together, they can be removed // Data and Q pins are connected together, they can be removed
// from the circuit. // from the circuit, since it doesn't do anything.
unsigned unlinked_count = 0; unsigned unlinked_count = 0;
for (unsigned idx = 0 ; idx < obj->width() ; idx += 1) { for (unsigned idx = 0 ; idx < obj->width() ; idx += 1) {
if (connected(obj->pin_Data(idx), obj->pin_Q(idx))) { if (connected(obj->pin_Data(idx), obj->pin_Q(idx))
&& (! obj->pin_Sclr().is_linked())
&& (! obj->pin_Sset().is_linked())
&& (! obj->pin_Aclr().is_linked())
&& (! obj->pin_Aset().is_linked())) {
obj->pin_Data(idx).unlink(); obj->pin_Data(idx).unlink();
obj->pin_Q(idx).unlink(); obj->pin_Q(idx).unlink();
} }
@ -1027,6 +1031,9 @@ void cprop(Design*des)
/* /*
* $Log: cprop.cc,v $ * $Log: cprop.cc,v $
* Revision 1.45 2003/10/31 02:40:06 steve
* Donot elide FF that has set or clr connections.
*
* Revision 1.44 2003/04/25 05:06:32 steve * Revision 1.44 2003/04/25 05:06:32 steve
* Handle X values in constant == nets. * Handle X values in constant == nets.
* *