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Better padding of constants.

This commit is contained in:
steve 2002-05-25 16:43:22 +00:00
parent 33efeca0da
commit 57f2ad6d15
1 changed files with 33 additions and 11 deletions
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44
pad_to_width.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: pad_to_width.cc,v 1.9 2001/10/28 01:14:53 steve Exp $"
#ident "$Id: pad_to_width.cc,v 1.10 2002/05/25 16:43:22 steve Exp $"
#endif
# include "config.h"
@ -33,17 +33,36 @@
*/
NetExpr*pad_to_width(NetExpr*expr, unsigned wid)
{
if (wid > expr->expr_width()) {
verinum pad(verinum::V0, wid - expr->expr_width());
NetEConst*co = new NetEConst(pad);
co->set_line(*expr);
NetEConcat*cc = new NetEConcat(2);
cc->set_line(*expr);
cc->set(0, co);
cc->set(1, expr);
cc->set_width(wid);
expr = cc;
if (wid <= expr->expr_width())
return expr;
/* If the expression is a const, then replace it with a wider
const. This is a more efficient result. */
if (NetEConst*tmp = dynamic_cast<NetEConst*>(expr)) {
verinum eval = tmp->value();
verinum::V pad = verinum::V0;
verinum oval (pad, wid, eval.has_len());
for (unsigned idx = 0 ; idx < eval.len() ; idx += 1)
oval.set(idx, eval.get(idx));
tmp = new NetEConst(oval);
delete expr;
return tmp;
}
/* Do it the hard way, with a concatenation. */
verinum pad(verinum::V0, wid - expr->expr_width());
NetEConst*co = new NetEConst(pad);
co->set_line(*expr);
NetEConcat*cc = new NetEConcat(2);
cc->set_line(*expr);
cc->set(0, co);
cc->set(1, expr);
cc->set_width(wid);
expr = cc;
return expr;
}
@ -76,6 +95,9 @@ NetNet*pad_to_width(Design*des, NetNet*net, unsigned wid)
/*
* $Log: pad_to_width.cc,v $
* Revision 1.10 2002/05/25 16:43:22 steve
* Better padding of constants.
*
* Revision 1.9 2001/10/28 01:14:53 steve
* NetObj constructor finally requires a scope.
*