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-rw-r--r--common/nextpnr.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/common/nextpnr.cc b/common/nextpnr.cc
index b0cbbbeb..54333b15 100644
--- a/common/nextpnr.cc
+++ b/common/nextpnr.cc
@@ -221,6 +221,9 @@ delay_t Context::getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &us
return 0;
#endif
+ if (net_info->wires.empty())
+ return predictDelay(net_info, user_info);
+
WireId src_wire = getNetinfoSourceWire(net_info);
if (src_wire == WireId())
return 0;