Clock prerouting Gowin fix?

Author: adrianparvino

himbaechel/uarch/gowin/constids.inc

@@ -1192,4 +1192,5 @@ X(HCLK_OUT3)
 X(BUFG)
 X(CLOCK)
 
-
+// Globally routed
+X(GLOBALLY_ROUTED)

himbaechel/uarch/gowin/globals.cc

@@ -196,7 +196,10 @@ struct GowinGlobalRouter
         }
         if (routed == NOT_ROUTED) {
             ctx->unbindWire(src);
+        } else {
+            net->attrs[id_GLOBALLY_ROUTED] = Property("YES");
         }
+
         return routed;
     }
 
@@ -233,6 +236,8 @@ struct GowinGlobalRouter
         }
         if (routed == NOT_ROUTED) {
             ctx->unbindWire(src);
+        } else {
+            net->attrs[id_GLOBALLY_ROUTED] = Property("YES");
         }
 
         // b) route net before buf from whatever to the buf input

himbaechel/uarch/gowin/gowin.cc

@@ -41,6 +41,7 @@ struct GowinImpl : HimbaechelAPI
 
     // wires
     bool checkPipAvail(PipId pip) const override;
+    bool checkPipAvailForNet(PipId pip, const NetInfo *net) const override;
 
     // Cluster
     bool isClusterStrict(const CellInfo *cell) const { return true; }
@@ -188,6 +189,16 @@ void GowinImpl::init(Context *ctx)
 // We do not allow the use of global wires that bypass a special router.
 bool GowinImpl::checkPipAvail(PipId pip) const { return !gwu.is_global_pip(pip); }
 
+bool GowinImpl::checkPipAvailForNet(PipId pip, const NetInfo *net) const {
+    if (gwu.is_global_pip(pip)) {
+        // Available for a globally routed net
+        auto prop = net->attrs.find(id_GLOBALLY_ROUTED);
+        return prop != net->attrs.end() && prop->second == Property("YES");
+    }
+
+    return true;
+}
+
 void GowinImpl::pack()
 {
     if (ctx->settings.count(ctx->id("cst.filename"))) {