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Optimize MX2/4

This commit is contained in:
Miodrag Milanovic 2025-07-09 17:35:36 +02:00
parent 048c24eaea
commit 24b33c0450
2 changed files with 46 additions and 0 deletions
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45
himbaechel/uarch/gatemate/pack.cc
View File

@ -176,6 +176,50 @@ void GateMatePacker::optimize_lut()
flush_cells();
}
void GateMatePacker::optimize_mx()
{
for (auto &cell : ctx->cells) {
CellInfo &ci = *cell.second;
if (!ci.type.in(id_CC_MX2, id_CC_MX4))
continue;
NetInfo *y_net = ci.getPort(id_Y);
if (!y_net) {
count_cell(ci);
continue;
}
if (ci.type == id_CC_MX2) {
if (ci.getPort(id_S0) == gnd_net) {
move_connections(y_net, ci.getPort(id_D0));
count_cell(ci);
continue;
} else if (ci.getPort(id_S0) == vcc_net) {
move_connections(y_net, ci.getPort(id_D1));
count_cell(ci);
continue;
}
} else {
if ((ci.getPort(id_S1) == gnd_net) && (ci.getPort(id_S0) == gnd_net)) {
move_connections(y_net, ci.getPort(id_D0));
count_cell(ci);
continue;
} else if ((ci.getPort(id_S1) == gnd_net) && (ci.getPort(id_S0) == vcc_net)) {
move_connections(y_net, ci.getPort(id_D1));
count_cell(ci);
continue;
} else if ((ci.getPort(id_S1) == vcc_net) && (ci.getPort(id_S0) == gnd_net)) {
move_connections(y_net, ci.getPort(id_D2));
count_cell(ci);
continue;
} else if ((ci.getPort(id_S1) == vcc_net) && (ci.getPort(id_S0) == vcc_net)) {
move_connections(y_net, ci.getPort(id_D3));
count_cell(ci);
continue;
}
}
}
flush_cells();
}
void GateMatePacker::optimize_ff()
{
for (auto &cell : ctx->cells) {
@ -237,6 +281,7 @@ void GateMatePacker::cleanup()
count = 0;
disconnect_not_used();
optimize_lut();
optimize_mx();
optimize_ff();
for (auto c : count_per_type)
log_info(" %6d %s cells removed (iteration %d)\n", c.second, c.first.c_str(ctx), i);

1
himbaechel/uarch/gatemate/pack.h
View File

@ -78,6 +78,7 @@ struct GateMatePacker
void disconnect_not_used();
void optimize_lut();
void optimize_mx();
void optimize_ff();
void count_cell(CellInfo &ci);
void move_connections(NetInfo *from_net, NetInfo *to_net);