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Elaborate multiply nets with constant operands ad NetConst.

This commit is contained in:
steve 2001-12-31 04:23:59 +00:00
parent 400580179f
commit 4bb91c4f98
1 changed files with 37 additions and 1 deletions
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38
elab_net.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: elab_net.cc,v 1.83 2001/12/30 21:32:03 steve Exp $"
#ident "$Id: elab_net.cc,v 1.84 2001/12/31 04:23:59 steve Exp $"
#endif
# include "config.h"
@ -783,12 +783,45 @@ NetNet* PEBinary::elaborate_net_mul_(Design*des, NetScope*scope,
unsigned long fall,
unsigned long decay) const
{
verinum*lnum = left_->eval_const(des, scope);
verinum*rnum = right_->eval_const(des, scope);
/* Detect and handle the special case that both the operands
of the multiply are constant expressions. Evalulate the
value and make this a simple constant. */
if (lnum && rnum) {
verinum prod = *lnum * *rnum;
if (lwidth == 0)
lwidth = prod.len();
verinum res (verinum::V0, lwidth);
for (unsigned idx = 0
; idx < prod.len() && idx < lwidth
; idx += 1) {
res.set(idx, prod.get(idx));
}
NetConst*odev = new NetConst(scope, scope->local_hsymbol(), res);
NetNet*osig = new NetNet(scope, scope->local_hsymbol(),
NetNet::IMPLICIT, lwidth);
for (unsigned idx = 0 ; idx < lwidth ; idx += 1)
connect(odev->pin(idx), osig->pin(idx));
des->add_node(odev);
osig->local_flag(true);
return osig;
}
NetNet*lsig = left_->elaborate_net(des, scope, lwidth, 0, 0, 0);
if (lsig == 0) return 0;
NetNet*rsig = right_->elaborate_net(des, scope, lwidth, 0, 0, 0);
if (rsig == 0) return 0;
unsigned rwidth = lwidth;
if (rwidth == 0) {
rwidth = lsig->pin_count() + rsig->pin_count();
}
NetMult*mult = new NetMult(scope, scope->local_hsymbol(), rwidth,
lsig->pin_count(),
rsig->pin_count());
@ -1941,6 +1974,9 @@ NetNet* PEUnary::elaborate_net(Design*des, NetScope*scope,
/*
* $Log: elab_net.cc,v $
* Revision 1.84 2001/12/31 04:23:59 steve
* Elaborate multiply nets with constant operands ad NetConst.
*
* Revision 1.83 2001/12/30 21:32:03 steve
* Support elaborate_net for PEString objects.
*