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gatemate: Reserve one level further uphill if needed 

Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2026-08-13 09:57:25 +02:00 committed by myrtle
parent c6eca2405b
commit 3e8ddf3a77
1 changed files with 26 additions and 9 deletions
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35
himbaechel/uarch/gatemate/route_clock.cc
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@ -74,16 +74,33 @@ void GateMateImpl::route_clock()
auto reserve = [&](WireId wire, NetInfo *net) {
for (auto pip : ctx->getPipsUphill(wire)) {
wire = ctx->getPipSrcWire(pip);
break;
WireId src = ctx->getPipSrcWire(pip);
if (ctx->debug) {
auto wire_name = "(uninitialized)";
if (src != WireId())
wire_name = ctx->nameOfWire(src);
log_info(" reserving wire %s\n", wire_name);
}
reserved_wires.insert({src, net->name});
int next_count = 0;
for (auto pip : ctx->getPipsUphill(src)) {
src = ctx->getPipSrcWire(pip);
++next_count;
}
if (next_count == 1) {
// If one layer above we still only have one choice of pip, reserve it too
if (ctx->debug) {
auto wire_name = "(uninitialized)";
if (src != WireId())
wire_name = ctx->nameOfWire(src);
log_info(" reserving wire %s\n", wire_name);
}
reserved_wires.insert({src, net->name});
}
}
if (ctx->debug) {
auto wire_name = "(uninitialized)";
if (wire != WireId())
wire_name = ctx->nameOfWire(wire);
log_info(" reserving wire %s\n", wire_name);
}
reserved_wires.insert({wire, net->name});
};
for (auto &net_pair : ctx->nets) {