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This commit is contained in:
Eddie Hung 2019-06-24 14:15:00 -07:00
parent 0aae3b4f43
commit 7fbfcf20d1
1 changed files with 3 additions and 3 deletions
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6
techlibs/xilinx/synth_xilinx.cc
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@ -279,11 +279,11 @@ struct SynthXilinxPass : public ScriptPass
if (minmuxf > 0 || help_mode) { if (minmuxf > 0 || help_mode) {
run("simplemap t:$mux", " ('-minmuxf' only)"); run("simplemap t:$mux", " ('-minmuxf' only)");
if (minmuxf > 0 || help_mode) { if (minmuxf > 0 || help_mode) {
// 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"; std::string muxcover_args = " -dmux=0";
switch (minmuxf) { switch (minmuxf) {
// 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
case 5: muxcover_args += " -mux8=350 -mux16=400"; break; case 5: muxcover_args += " -mux8=350 -mux16=400"; break;
case 6: muxcover_args += " -mux8=450 -mux16=500"; break; case 6: muxcover_args += " -mux8=450 -mux16=500"; break;
case 7: muxcover_args += " -mux8=550 -mux16=600"; break; case 7: muxcover_args += " -mux8=550 -mux16=600"; break;