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Improve net priorities in EDIF back-end 

Signed-off-by: Claire Wolf <claire@symbioticeda.com>
This commit is contained in:
Claire Wolf 2020-04-21 12:35:25 +02:00
parent ee5067e864
commit 27506d2aeb
1 changed files with 64 additions and 0 deletions
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64
backends/edif/edif.cc
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@ -345,6 +345,70 @@ struct EdifBackend : public Backend {
*f << stringf(" (viewType NETLIST)\n");
*f << stringf(" (interface\n");
for (auto cell : module->cells()) {
for (auto &conn : cell->connections())
if (cell->output(conn.first))
sigmap.add(conn.second);
}
for (auto wire : module->wires())
for (auto b1 : SigSpec(wire))
{
auto b2 = sigmap(b1);
if (b1 == b2 || !b2.wire)
continue;
log_assert(b1.wire != nullptr);
Wire *w1 = b1.wire;
Wire *w2 = b2.wire;
{
int c1 = w1->get_bool_attribute(ID::keep);
int c2 = w2->get_bool_attribute(ID::keep);
if (c1 > c2) goto promote;
if (c1 < c2) goto nopromote;
}
{
int c1 = w1->name[0] == '\\';
int c2 = w2->name[0] == '\\';
if (c1 > c2) goto promote;
if (c1 < c2) goto nopromote;
}
{
auto count_nontrivial_attr = [](Wire *w) {
int count = w->attributes.size();
count -= w->attributes.count(ID::src);
count -= w->attributes.count(ID::unused_bits);
return count;
};
int c1 = count_nontrivial_attr(w1);
int c2 = count_nontrivial_attr(w2);
if (c1 > c2) goto promote;
if (c1 < c2) goto nopromote;
}
{
int c1 = w1->port_id ? INT_MAX - w1->port_id : 0;
int c2 = w2->port_id ? INT_MAX - w2->port_id : 0;
if (c1 > c2) goto promote;
if (c1 < c2) goto nopromote;
}
nopromote:
if (0)
promote:
sigmap.add(b1);
}
for (auto wire : module->wires()) {
if (wire->port_id == 0)
continue;