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Add fanoutlimit

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This commit is contained in:
Akash Levy 2024-08-27 17:20:29 -07:00
parent 77868f52ec
commit be9a4f338d
3 changed files with 32 additions and 9 deletions
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10
passes/opt/muxpack.cc
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@ -344,6 +344,9 @@ struct MuxpackPass : public Pass {
log(" -splitfanout\n");
log(" run splitfanout pass first\n");
log("\n");
log(" -fanoutlimit\n");
log(" fanout limit for splitfanout, beyond which no split (default: 10)\n");
log("\n");
log(" -assume_excl\n");
log(" assume mutually exclusive constraint when packing (may result in inequivalence)\n");
log("\n");
@ -352,6 +355,7 @@ struct MuxpackPass : public Pass {
{
bool splitfanout = false;
bool assume_excl = false;
int fanoutlimit = 10;
log_header(design, "Executing MUXPACK pass ($mux cell cascades to $pmux).\n");
@ -362,6 +366,10 @@ struct MuxpackPass : public Pass {
splitfanout = true;
continue;
}
if ((args[argidx] == "-fanoutlimit") && ((argidx + 1) < args.size())) {
fanoutlimit = std::stoi(args[++argidx]);
continue;
}
if (args[argidx] == "-assume_excl") {
assume_excl = true;
continue;
@ -371,7 +379,7 @@ struct MuxpackPass : public Pass {
extra_args(args, argidx, design);
if (splitfanout)
Pass::call(design, "splitfanout t:$mux t:$pmux");
Pass::call(design, stringf("splitfanout -fanoutlimit %d t:$mux t:$pmux", fanoutlimit));
int mux_count = 0;
int pmux_count = 0;