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new pass for comb depth #215

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Merged
matth2k merged 2 commits into from
Mar 1, 2026
Merged

new pass for comb depth #215

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5fb8b21
new passes
danielpenas42 Mar 1, 2026
b364a62
formatting
danielpenas42 Mar 1, 2026
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20 changes: 18 additions & 2 deletions src/bin/nl_opt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ use eqmap::pass::{Error, Pass, PrintVerilog};
use eqmap::register_passes;
use eqmap::verilog::sv_parse_wrapper;
use nl_compiler::{from_vast, from_vast_overrides};
use safety_net::{Identifier, Instantiable, MultiDiGraph, Netlist, format_id};
use safety_net::{Identifier, Instantiable, MultiDiGraph, Netlist, SimpleCombDepth, format_id};
use std::io::Read;
use std::path::PathBuf;
use std::rc::Rc;
Expand Down Expand Up @@ -130,8 +130,24 @@ impl Pass for ReportSccs {
}
}

// Report the longest path in the netlist

pub struct ReportDepth;

impl Pass for ReportDepth {
type I = PrimitiveCell;
fn run(&self, netlist: &Rc<Netlist<Self::I>>) -> Result<String, Error> {
let analysis = netlist.get_analysis::<SimpleCombDepth<_>>()?;
match analysis.get_max_depth() {
Some(depth) => Ok(format!("Maximum combinational depth: {depth}")),
None => Ok("Maximum combinational depth: undefined".to_string()),
}
}
}

register_passes!(PrimitiveCell; PrintVerilog, DotGraph, Clean, DisconnectRegisters,
DisconnectArcSet, MarkArcSet, RenameNets, ReportSccs);
DisconnectArcSet, MarkArcSet, RenameNets, ReportSccs,
ReportDepth);

/// Netlist optimization debugging tool
#[derive(Parser, Debug)]
Expand Down