2 files changed, 34 insertions, 12 deletions
diff --git a/ice40/chip.cc b/ice40/chip.cc
index 918a7fb4..de33b020 100644
--- a/ice40/chip.cc
+++ b/ice40/chip.cc
@@ -17,6 +17,7 @@
  *
  */
 
+#include <math.h>
 #include "log.h"
 #include "nextpnr.h"
 
@@ -230,27 +231,40 @@ PipId Chip::getPipByName(IdString name) const
 
 // -----------------------------------------------------------------------
 
-void Chip::getBelPosition(BelId bel, float &x, float &y) const
+PosInfo Chip::getBelPosition(BelId bel) const
 {
+    PosInfo pos;
     assert(bel != BelId());
-    x = chip_info.bel_data[bel.index].x;
-    y = chip_info.bel_data[bel.index].y;
+    pos.x = chip_info.bel_data[bel.index].x;
+    pos.y = chip_info.bel_data[bel.index].y;
+    return pos;
 }
 
-void Chip::getWirePosition(WireId wire, float &x, float &y) const
+PosInfo Chip::getWirePosition(WireId wire) const
 {
+    PosInfo pos;
     assert(wire != WireId());
-    x = chip_info.wire_data[wire.index].x;
-    y = chip_info.wire_data[wire.index].y;
+    pos.x = chip_info.wire_data[wire.index].x;
+    pos.y = chip_info.wire_data[wire.index].y;
+    return pos;
 }
 
-void Chip::getPipPosition(PipId pip, float &x, float &y) const
+PosInfo Chip::getPipPosition(PipId pip) const
 {
+    PosInfo pos;
     assert(pip != PipId());
-    x = chip_info.pip_data[pip.index].x;
-    y = chip_info.pip_data[pip.index].y;
+    pos.x = chip_info.pip_data[pip.index].x;
+    pos.y = chip_info.pip_data[pip.index].y;
+    return pos;
 }
 
+float Chip::estimateDelay(PosInfo src, PosInfo dst) const
+{
+    return fabsf(src.x - dst.x) + fabsf(src.x - dst.x);
+}
+
+// -----------------------------------------------------------------------
+
 std::vector<GraphicElement> Chip::getBelGraphics(BelId bel) const
 {
     std::vector<GraphicElement> ret;
diff --git a/ice40/chip.h b/ice40/chip.h
index f8946610..2c95bf4e 100644
--- a/ice40/chip.h
+++ b/ice40/chip.h
@@ -42,6 +42,11 @@ struct DelayInfo
     }
 };
 
+struct PosInfo
+{
+    float x = 0, y = 0;
+};
+
 // -----------------------------------------------------------------------
 
 enum BelType
@@ -679,9 +684,12 @@ struct Chip
 
     // -------------------------------------------------
 
-    void getBelPosition(BelId bel, float &x, float &y) const;
-    void getWirePosition(WireId wire, float &x, float &y) const;
-    void getPipPosition(PipId pip, float &x, float &y) const;
+    PosInfo getBelPosition(BelId bel) const;
+    PosInfo getWirePosition(WireId wire) const;
+    PosInfo getPipPosition(PipId pip) const;
+    float estimateDelay(PosInfo src, PosInfo dst) const;
+
+    // -------------------------------------------------
 
     std::vector<GraphicElement> getBelGraphics(BelId bel) const;
     std::vector<GraphicElement> getWireGraphics(WireId wire) const;