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Support synthesis of constant downshifts.

This commit is contained in:
steve 2003-09-03 23:31:36 +00:00
parent ca0a9faa90
commit b0230cf4d4
1 changed files with 20 additions and 9 deletions
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29
expr_synth.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: expr_synth.cc,v 1.48 2003/08/28 04:11:18 steve Exp $"
#ident "$Id: expr_synth.cc,v 1.49 2003/09/03 23:31:36 steve Exp $"
#endif
# include "config.h"
@ -463,10 +463,8 @@ NetNet* NetEBShift::synthesize(Design*des)
if (op() == 'r')
shift = 0-shift;
assert(shift >= 0);
if (shift == 0)
return lsig;
unsigned long ushift=shift;
NetNet*osig = new NetNet(scope, scope->local_symbol(),
NetNet::IMPLICIT, expr_width());
@ -479,14 +477,24 @@ NetNet* NetEBShift::synthesize(Design*des)
NetNet::WIRE, 1);
connect(zcon->pin(0), zsig->pin(0));
for (unsigned idx = 0 ; idx < osig->pin_count() ; idx += 1) {
if (idx < ushift) {
connect(osig->pin(idx), zsig->pin(0));
} else {
connect(osig->pin(idx), lsig->pin(idx-ushift));
}
if (shift > 0) {
unsigned long ushift = shift;
for (unsigned idx = 0; idx < osig->pin_count(); idx += 1)
if (idx < ushift) {
connect(osig->pin(idx), zsig->pin(0));
} else {
connect(osig->pin(idx), lsig->pin(idx-ushift));
}
} else {
unsigned long dshift = 0-shift;
for (unsigned idx = 0; idx < osig->pin_count() ; idx += 1)
if (idx+dshift < lsig->pin_count())
connect(osig->pin(idx), lsig->pin(idx+dshift));
else
connect(osig->pin(idx), zsig->pin(0));
}
return osig;
}
@ -809,6 +817,9 @@ NetNet* NetESignal::synthesize(Design*des)
/*
* $Log: expr_synth.cc,v $
* Revision 1.49 2003/09/03 23:31:36 steve
* Support synthesis of constant downshifts.
*
* Revision 1.48 2003/08/28 04:11:18 steve
* Spelling patch.
*