Add generation of models to tmfuzz

Signed-off-by: Clifford Wolf <clifford@clifford.at>

1 files changed, 30 insertions, 0 deletions

diff --git a/ice40/arch.cc b/ice40/arch.cc
index d44d8c19..3b9a6992 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -651,6 +651,7 @@ delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
         return 250;
     }
 
+#if 1
     int xd = sink_loc.x - driver_loc.x, yd = sink_loc.y - driver_loc.y;
     int xscale = 120, yscale = 120, offset = 0;
 
@@ -665,6 +666,35 @@ delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
         offset += 260;
 
     return xscale * abs(xd) + yscale * abs(yd) + offset;
+#else
+    float model1_param_offset = 902.1066988;
+    float model1_param_norm1 = 169.80428447;
+    float model1_param_norm2 = -503.28635487;
+    float model1_param_norm3 = 402.96583807;
+
+    float model2_param_offset = -1.09578873e+03;
+    float model2_param_linear = 5.01094876e-01;
+    float model2_param_sqrt = 4.71761281e+01;
+
+    float dx = fabsf(sink_loc.x - driver_loc.x);
+    float dy = fabsf(sink_loc.y - driver_loc.y);
+    float norm1 = dx + dy;
+
+    float dx2 = dx * dx;
+    float dy2 = dy * dy;
+    float norm2 = sqrtf(dx2 + dy2);
+
+    float dx3 = dx2 * dx;
+    float dy3 = dy2 * dy;
+    float norm3 = powf(dx3 + dy3, 1.0/3.0);
+
+    float v = model1_param_offset;
+    v += model1_param_norm1 * norm1;
+    v += model1_param_norm2 * norm2;
+    v += model1_param_norm3 * norm3;
+
+    return model2_param_offset + model2_param_linear * v + model2_param_sqrt * sqrtf(v);
+#endif
 }
 
 delay_t Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t budget) const