vyges-gpl

Global placement. Today the engine builds the placer's view of the design — instances, nets, pins, regions, the sites a placement may not use — and runs the initial placement: rounds of a bound-to-bound net model solved by BiCGSTAB, in exactly the arithmetic order of the reference solver, so every coordinate matches bit for bit. The Nesterov placement comes next; until then a full global_placement is refused after the initial placement, and -skip_nesterov_place places the design.

vyges install physical
vyges physical gpl global_placement job.json
vyges physical gpl --describe

Documentation: docs/src/gpl.md (an mdBook; mdbook build docs), with the CLI reference.

The job

{
  "steps": [
    { "cmd": "read_db",          "args": ["floorplan.odb"] },
    { "cmd": "global_placement", "args": ["-skip_nesterov_place"] }
  ],
  "write_def": "placed.def"
}

The report carries the command's own lines in order — the placer's header (core, site, instance and pin counts, areas, utilisation) and each [InitialPlace] round with its residual and HPWL — and a status:

{ "tool": "vyges-gpl", "status": "placed", "insts": 294, "nets": 364, "pins": 1122,
  "lines": [ "[INFO GPL-0001] ---- Initialize GPL Main Data Structures", … ] }

What is modelled

• the placer's construction: instances (fixed ones snapped outward to whole sites, padding), the pin-density area adjustment, signal and clock nets with their pins, regions, dummy instances over unusable sites;
• the initial placement: start points, the bound-to-bound matrix for x and y, the solver with its restart, the clamp to the core and region, the database written as the reference writes it.

Refused rather than guessed: -incremental, -place_ios, region groups, placement clusters.

Build

Check out vyges-tools/opendb, opendb-lib, loom and layout beside this repository (see .github/workflows/ci.yml), then:

cargo build --release --features cli
cargo test  --release --features cli

Without --features cli the library builds with no C++ dependency.

Licensed under Apache-2.0.