Modify costs for muxcover

diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 2cf28fce1aa384532c6663cc177f1976da255176..a84f54e9958c664239beeb1e61c226ae7c872952 100644 (file)
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -282,7 +282,21 @@ struct SynthXilinxPass : public ScriptPass
                                        // NB: Cost of mux2 is 100; mux8 should cost between 3 and 4
                                        //     of those so that 4:1 muxes and below are implemented
                                        //     out of mux2s
-                                       std::string muxcover_args = " -dmux=0 -mux8=350 -mux16=400";
+                                       std::string muxcover_args = " -dmux=0";
+                                       switch (minmuxf) {
+                                               case  5: muxcover_args += " -mux8=350 -mux16=400"; break;
+                                               case  6: muxcover_args += " -mux8=450 -mux16=500"; break;
+                                               case  7: muxcover_args += " -mux8=550 -mux16=600"; break;
+                                               case  8: muxcover_args += " -mux8=650 -mux16=700"; break;
+                                               case  9: muxcover_args += " -mux16=750"; break;
+                                               case 10: muxcover_args += " -mux16=850"; break;
+                                               case 11: muxcover_args += " -mux16=950"; break;
+                                               case 12: muxcover_args += " -mux16=1050"; break;
+                                               case 13: muxcover_args += " -mux16=1150"; break;
+                                               case 14: muxcover_args += " -mux16=1250"; break;
+                                               case 15: muxcover_args += " -mux16=1350"; break;
+                                               default: muxcover_args += " -mux16=1450"; break;
+                                       }
                                        run("muxcover " + muxcover_args, "('-minmuxf' only)");
                                }
                        }