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Handle zero repetition in a synthesized concatenation. 

It is valid to have a repetition of zero inside a concatenation
that has other elements with a defined width. This patch adds
this functionality to the synthesize method. It also prints
an error if you try to synthesize a zero width constant.
(cherry picked from commit fa8a3d6c2e)
This commit is contained in:
Cary R 2009-03-17 14:44:23 -07:00 committed by Stephen Williams
parent c47ea0721c
commit 9fec1f7e45
1 changed files with 16 additions and 7 deletions
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23
expr_synth.cc
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@ -719,16 +719,20 @@ NetNet* NetEBShift::synthesize(Design*des, NetScope*scope, NetExpr*root)
NetNet* NetEConcat::synthesize(Design*des, NetScope*scope, NetExpr*root)
{
/* First, synthesize the operands. */
unsigned nparms = parms_.count();
NetNet**tmp = new NetNet*[parms_.count()];
bool flag = true;
for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1) {
tmp[idx] = parms_[idx]->synthesize(des, scope, root);
if (tmp[idx] == 0)
flag = false;
if (parms_[idx]->expr_width() == 0) {
tmp[idx] = 0;
nparms -= 1;
} else {
tmp[idx] = parms_[idx]->synthesize(des, scope, root);
if (tmp[idx] == 0) flag = false;
}
}
if (flag == false)
return 0;
if (flag == false) return 0;
ivl_assert(*this, tmp[0]);
@ -740,7 +744,7 @@ NetNet* NetEConcat::synthesize(Design*des, NetScope*scope, NetExpr*root)
NetConcat*concat = new NetConcat(scope, scope->local_symbol(),
osig->vector_width(),
parms_.count() * repeat());
nparms * repeat());
concat->set_line(*this);
des->add_node(concat);
connect(concat->pin(0), osig->pin(0));
@ -750,7 +754,7 @@ NetNet* NetEConcat::synthesize(Design*des, NetScope*scope, NetExpr*root)
for (unsigned rpt = 0; rpt < repeat(); rpt += 1) {
for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1) {
unsigned concat_item = parms_.count()-idx-1;
ivl_assert(*this, tmp[concat_item]);
if (tmp[concat_item] == 0) continue;
connect(concat->pin(cur_pin), tmp[concat_item]->pin(0));
cur_pin += 1;
count_input_width += tmp[concat_item]->vector_width();
@ -773,6 +777,11 @@ NetNet* NetEConst::synthesize(Design*des, NetScope*scope, NetExpr*)
{
perm_string path = scope->local_symbol();
unsigned width=expr_width();
if (width == 0) {
cerr << get_fileline() << ": internal error: "
<< "Found a zero width constant!" << endl;
return 0;
}
NetNet*osig = new NetNet(scope, path, NetNet::IMPLICIT, width);
osig->local_flag(true);