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Modify costs for muxcover

This commit is contained in:
Eddie Hung 2019-06-24 11:51:55 -07:00
parent c2387394e3
commit aa1eeda567
1 changed files with 15 additions and 1 deletions
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16
techlibs/xilinx/synth_xilinx.cc
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@ -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)");
}
}