diff --git a/src/grt/src/fastroute/include/Graph2D.h b/src/grt/src/fastroute/include/Graph2D.h index c7af8aadaee..23194a07a39 100644 --- a/src/grt/src/fastroute/include/Graph2D.h +++ b/src/grt/src/fastroute/include/Graph2D.h @@ -5,6 +5,7 @@ #include #include +#include #include #include #include @@ -152,9 +153,13 @@ class Graph2D multi_array h_edges_; // The way it is indexed is (X, Y) multi_array v_cap_3D_; // The way it is indexed is (Layer, X, Y) multi_array h_cap_3D_; // The way it is indexed is (Layer, X, Y) - multi_array, 2> + // Maps each NDR net present on an edge to whether it contributed the + // inflated overflow cost when it was added. Removal must subtract exactly + // what the net added, regardless of how the edge's overflow state changed + // in between, otherwise the uint16_t usage/ndr_overflow underflows. + multi_array, 2> v_ndr_nets_; // The way it is indexed is (X, Y) - multi_array, 2> + multi_array, 2> h_ndr_nets_; // The way it is indexed is (X, Y) std::vector congested_ndrs_; diff --git a/src/grt/src/fastroute/src/graph2d.cpp b/src/grt/src/fastroute/src/graph2d.cpp index 5cc3c54890a..4e535cf0b8c 100644 --- a/src/grt/src/fastroute/src/graph2d.cpp +++ b/src/grt/src/fastroute/src/graph2d.cpp @@ -673,10 +673,14 @@ double Graph2D::getCostNDRAware(FrNet* net, // half the edge cost a second time in the initial routing steps. But we // only need to count once to avoid problems when managing 3D capacity if (is_net_present) { + // Mirror exactly what this net added: if it contributed the inflated + // overflow cost when routed, remove the same amount now. Using the + // edge's current ndr_overflow state instead would remove a different + // amount than was added when other nets changed that state in between, + // underflowing the uint16_t usage/ndr_overflow (GRT-0228). + const bool net_added_overflow = ndr_nets.find(net)->second; ndr_nets.erase(net); - // If the edge already has an overflow caused by NDR net we need to remove - // the big edge cost value - if (edge.ndr_overflow > 0) { + if (net_added_overflow) { edge.ndr_overflow--; final_edge_cost = -OVERFLOW_COST_MULTIPLIER * edgeCost; } else { @@ -693,13 +697,17 @@ double Graph2D::getCostNDRAware(FrNet* net, // If the edge already has an overflow caused by NDR net or it will have // an overflow due to lack of capacity in a single layer, we need to add // the big edge cost value - if (edge.ndr_overflow > 0 || !hasNDRCapacity(net, x, y, direction)) { + const bool net_added_overflow + = edge.ndr_overflow > 0 || !hasNDRCapacity(net, x, y, direction); + if (net_added_overflow) { edge.ndr_overflow++; final_edge_cost = OVERFLOW_COST_MULTIPLIER * edgeCost; } else { final_edge_cost = edgeCost; } - ndr_nets.insert(net); + // Remember whether this net added the inflated cost so the matching + // rip-up subtracts the same amount. + ndr_nets[net] = net_added_overflow; updateNDRCapLayer(x, y, net, direction, edge_cost); } } diff --git a/src/grt/test/soft_ndr_reset_cap.ok b/src/grt/test/soft_ndr_reset_cap.ok index fc9b3deb558..2ab89315f13 100644 --- a/src/grt/test/soft_ndr_reset_cap.ok +++ b/src/grt/test/soft_ndr_reset_cap.ok @@ -33,67 +33,12 @@ met5 Horizontal 3108 1406 54.76% --------------------------------------------------------------- [INFO GRT-0101] Running extra iterations to remove congestion. -[INFO GRT-0102] Start extra iteration 1/50 -[INFO GRT-0102] Start extra iteration 2/50 -[INFO GRT-0102] Start extra iteration 3/50 -[INFO GRT-0102] Start extra iteration 4/50 -[INFO GRT-0102] Start extra iteration 5/50 -[INFO GRT-0102] Start extra iteration 6/50 -[INFO GRT-0102] Start extra iteration 7/50 -[INFO GRT-0102] Start extra iteration 8/50 -[INFO GRT-0102] Start extra iteration 9/50 -[INFO GRT-0102] Start extra iteration 10/50 [WARNING GRT-0273] Disabled NDR (to reduce congestion) for net: clk -[INFO GRT-0102] Start extra iteration 1/50 -[INFO GRT-0102] Start extra iteration 2/50 -[INFO GRT-0102] Start extra iteration 3/50 -[INFO GRT-0102] Start extra iteration 4/50 -[INFO GRT-0102] Start extra iteration 5/50 -[INFO GRT-0102] Start extra iteration 6/50 -[INFO GRT-0102] Start extra iteration 7/50 -[INFO GRT-0102] Start extra iteration 8/50 -[INFO GRT-0102] Start extra iteration 9/50 -[INFO GRT-0102] Start extra iteration 10/50 -[INFO GRT-0102] Start extra iteration 11/50 [WARNING GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_2_3__leaf_clk -[INFO GRT-0102] Start extra iteration 1/50 -[INFO GRT-0102] Start extra iteration 2/50 -[INFO GRT-0102] Start extra iteration 3/50 -[INFO GRT-0102] Start extra iteration 4/50 -[INFO GRT-0102] Start extra iteration 5/50 -[INFO GRT-0102] Start extra iteration 6/50 -[INFO GRT-0102] Start extra iteration 7/50 -[INFO GRT-0102] Start extra iteration 8/50 -[INFO GRT-0102] Start extra iteration 9/50 -[INFO GRT-0102] Start extra iteration 10/50 -[INFO GRT-0102] Start extra iteration 11/50 [WARNING GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_2_2__leaf_clk -[INFO GRT-0102] Start extra iteration 1/50 -[INFO GRT-0102] Start extra iteration 2/50 -[INFO GRT-0102] Start extra iteration 3/50 -[INFO GRT-0102] Start extra iteration 4/50 -[INFO GRT-0102] Start extra iteration 5/50 -[INFO GRT-0102] Start extra iteration 6/50 -[INFO GRT-0102] Start extra iteration 7/50 -[INFO GRT-0102] Start extra iteration 8/50 -[INFO GRT-0102] Start extra iteration 9/50 -[INFO GRT-0102] Start extra iteration 10/50 -[INFO GRT-0102] Start extra iteration 11/50 [WARNING GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_2_1__leaf_clk -[INFO GRT-0102] Start extra iteration 1/50 -[INFO GRT-0102] Start extra iteration 2/50 -[INFO GRT-0102] Start extra iteration 3/50 -[INFO GRT-0102] Start extra iteration 4/50 -[INFO GRT-0102] Start extra iteration 5/50 -[INFO GRT-0102] Start extra iteration 6/50 -[INFO GRT-0102] Start extra iteration 7/50 -[INFO GRT-0102] Start extra iteration 8/50 -[INFO GRT-0102] Start extra iteration 9/50 -[INFO GRT-0102] Start extra iteration 10/50 -[INFO GRT-0102] Start extra iteration 11/50 [WARNING GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_2_0__leaf_clk [WARNING GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_0_clk -[INFO GRT-0102] Start extra iteration 1/50 [INFO GRT-0197] Via related to pin nodes: 151 [INFO GRT-0198] Via related Steiner nodes: 13 [INFO GRT-0199] Via filling finished. diff --git a/src/grt/test/soft_ndr_reset_cap.tcl b/src/grt/test/soft_ndr_reset_cap.tcl index e0f67b2a418..30b2526b473 100644 --- a/src/grt/test/soft_ndr_reset_cap.tcl +++ b/src/grt/test/soft_ndr_reset_cap.tcl @@ -38,6 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"DRT::clock_skew": "0.17684443299187683", + "DRT::max_slew_slack": "-75.58189630508423", "DRT::max_fanout_slack": "100.0", - "DRT::max_capacitance_slack": "-28.812117875042414", + "DRT::max_capacitance_slack": "-82.49706670884947", "DRT::clock_period": "11.290000", - "flow__warnings__count": 131, + "flow__warnings__count": 129, "flow__errors__count": 0, "flow__warnings__count:DRT-0120": 98, "flow__warnings__count:DRT-0349": 10, "flow__warnings__count:GPL-0302": 2, "flow__warnings__count:GRT-0243": 2, - "flow__warnings__count:GRT-0273": 3, + "flow__warnings__count:GRT-0273": 1, "flow__warnings__count:GRT-0281": 1, "flow__warnings__count:GRT-0297": 1, "flow__warnings__count:IFP-0028": 1, diff --git a/test/ibex_sky130hs.metrics_limits b/test/ibex_sky130hs.metrics_limits index 2d73395ff2a..a087282da33 100644 --- a/test/ibex_sky130hs.metrics_limits +++ b/test/ibex_sky130hs.metrics_limits @@ -1,24 +1,24 @@ { "IFP::instance_count" : "16722.0" - ,"DPL::design_area" : "267487.2" - 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,"DRT::tns_max" : "-1573.8979144946727" + ,"DRT::clock_skew" : "0.25869174201658035" + ,"DRT::max_slew_slack" : "-129.6677541732788" + ,"DRT::max_capacitance_slack" : "-136.64441403988396" ,"DRT::max_fanout_slack" : "0" ,"DRT::clock_period" : "11.29" - ,"DRT::ANT::errors" : "0" + ,"DRT::ANT::errors" : "1" }