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gowin: Himbaechel. Improve global router. #1286

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merged 2 commits into from
Feb 9, 2024
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gowin: Himbaechel. Improve global router. #1286

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gowin: Himbaechel. Improve global router.
yrabbit Jan 31, 2024
b188b80
gowin: Himbaechel. Edit message text.
yrabbit Feb 6, 2024
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38 changes: 27 additions & 11 deletions himbaechel/uarch/gowin/globals.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -71,7 +71,7 @@ struct GowinGlobalRouter
template <typename Tfilt>
bool backwards_bfs_route(NetInfo *net, WireId src, WireId dst, int iter_limit, bool strict, Tfilt pip_filter)
{
// log_info("%s:%s->%s\n", net->name.c_str(ctx), ctx->nameOfWire(src), ctx->nameOfWire(dst));
// log_info("route arc %s:%s->%s\n", net->name.c_str(ctx), ctx->nameOfWire(src), ctx->nameOfWire(dst));
// Queue of wires to visit
std::queue<WireId> visit;
// Wire -> upstream pip
Expand Down Expand Up @@ -141,7 +141,7 @@ struct GowinGlobalRouter
// Bind pips until we hit already-bound routing
for (PipId pip : pips) {
WireId dst = ctx->getPipDstWire(pip);
// log_info("%s:%s\n", ctx->getPipName(pip).str(ctx).c_str(), ctx->nameOfWire(dst));
// log_info("bind pip %s:%s\n", ctx->getPipName(pip).str(ctx).c_str(), ctx->nameOfWire(dst));
if (ctx->getBoundWireNet(dst) == net) {
break;
}
Expand All @@ -160,7 +160,14 @@ struct GowinGlobalRouter
}
}

bool route_direct_net(NetInfo *net)
enum RouteResult
{
NOT_ROUTED = 0,
ROUTED_PARTIALLY,
ROUTED_ALL
};

RouteResult route_direct_net(NetInfo *net)
{
// Lookup source and destination wires
WireId src = ctx->getNetinfoSourceWire(net);
Expand All @@ -172,20 +179,24 @@ struct GowinGlobalRouter
ctx->bindWire(src, net, STRENGTH_LOCKED);
}

bool routed = false;
RouteResult routed = NOT_ROUTED;
for (auto usr : net->users.enumerate()) {
WireId dst = ctx->getNetinfoSinkWire(net, net->users.at(usr.index), 0);
if (dst == WireId()) {
log_error("Net '%s' has an invalid sink port %s.%s\n", ctx->nameOf(net),
ctx->nameOf(net->users.at(usr.index).cell), ctx->nameOf(net->users.at(usr.index).port));
}
routed = backwards_bfs_route(net, src, dst, 1000000, false, [&](PipId pip) {
return (is_relaxed_sink(usr.value) || global_pip_filter(pip));
});
if (!routed) {
break;
if (backwards_bfs_route(net, src, dst, 1000000, false, [&](PipId pip) {
return (is_relaxed_sink(usr.value) || global_pip_filter(pip));
})) {
routed = routed == ROUTED_PARTIALLY ? routed : ROUTED_ALL;
} else {
routed = routed == NOT_ROUTED ? routed : ROUTED_PARTIALLY;
}
}
if (routed == NOT_ROUTED) {
ctx->unbindWire(src);
}
return routed;
}

Expand Down Expand Up @@ -229,8 +240,10 @@ struct GowinGlobalRouter

void route_clk_net(NetInfo *net)
{
if (route_direct_net(net)) {
log_info(" routed net '%s' using global resources\n", ctx->nameOf(net));
RouteResult res = route_direct_net(net);
if (res) {
log_info(" routed net '%s' using global resources %s.\n", ctx->nameOf(net),
res == ROUTED_ALL ? "only" : "partially");
}
}

Expand Down Expand Up @@ -301,6 +314,9 @@ struct GowinGlobalRouter
continue;
}
if (driver_is_clksrc(ni->driver)) {
if (ctx->verbose) {
log_info("route clock net '%s'\n", ctx->nameOf(ni));
}
route_clk_net(ni);
continue;
}
Expand Down