feat: openroad hierarchical macro placer #537
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* `Yosys.JsonHeader`, `Yosys.*Synthesis`
* **Internal**:
* Steps are no longer `TclStep`s: rewritten in Python and now use `libyosys`. While there are no functional changes, this enhances the codebase's consistency and helps avoid tokenization-related security issues.
* `Yosys.*Synthesis`
* ABC scripts used now created dynamically and dumped as a `.abc` file into the step directory.
* Updated `nix-eda`
* `yosys` -> `0.44` (+ `-y` patch)
* `klayout` -> `0.29.4`
* OpenROAD now used with new `withPythonPackages` features to use Python packages specifically for the OpenROAD environment
* `OpenROAD.*`
* Added `log_cmd` from OpenROAD-flow-scripts -- neat idea for consistency
* **Internal**: Steps now sensitive to `_OPENROAD_GUI` environment variable -- coupled with `--only`, it runs a step in OpenROAD then doesn't quit so you may inspect the result.
* This is not part of the OpenLane stable API and may be broken at any moment.
* `OpenROAD.CutRows`
* Rows that generate less than a specified number of sites are now removed to help with PDN generation (default: 25)
* Created `OpenROAD.HierarchicalMacroPlacer`
* Based on OpenROAD `mpl2`-- a macro placer that uses hierarchy information from the RTL to generate a macro placement automatically
* Used for macros for which a manual placement has not been provided
* Created `OpenROAD.UnplaceAll`
* Removes placement status of all instances.
* `Yosys.Synthesis`
* `SYNTH_NO_FLAT` replaced with `SYNTH_HIERARCHY_MODE` with three options: `flatten` (previously `false`), `deferred_flatten` (previously `true`) and `keep` (new value). When set to `keep`, the netlist generated is hierarchical.
## Flows
* Classic
* Added `OpenROAD.HierarchicalMacroPlacer` after `Odb.ManualMacroPlacement`
* Moved pin placement flow before macro placement as `mpl2` requires pin placement information
* Added `OpenROAD.UnplaceAll` after pin placement so rows can be cut for macros without worries about already-placed instances
## Tool Updates
* `openroad` -> `49a497a`
* Enhanced overlay for `or-tools` to fix a bug where trying to build OpenROAD from a git repo (using nix develop .#openroad) would Cmake always fail after the first `cmake ..`
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EF_UART don't fail every time I slightly alter the flow challenge (impossible) |
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OpenROAD.*log_cmdfrom OpenROAD-flow-scripts -- neat idea for consistency_OPENROAD_GUIenvironment variable -- coupled with--only, it runs a step in OpenROAD then doesn't quit so you may inspect the result.OpenROAD.CutRowsCreated
OpenROAD.HierarchicalMacroPlacermpl2-- a macro placer that uses hierarchy information from the RTL to generate a macro placement automaticallyCreated
OpenROAD.UnplaceAllYosys.SynthesisSYNTH_NO_FLATreplaced withSYNTH_HIERARCHY_MODEwith three options:flatten(previouslyfalse),deferred_flatten(previouslytrue) andkeep(new value). When set tokeep, the netlist generated is hierarchical.Flows
OpenROAD.HierarchicalMacroPlacerafterOdb.ManualMacroPlacementmpl2requires pin placement informationOpenROAD.UnplaceAllafter pin placement so rows can be cut for macros without worries about already-placed instancesTool Updates
openroad->49a497aor-toolsto fix a bug where trying to build OpenROAD from a git repo (using nix develop .#openroad) would Cmake always fail after the firstcmake ..Depends on #534
Resolves #506