The-OpenROAD-Project/OpenROAD

Add some good examples from antonblanchard/vlsiffra as a regression test / benchmark

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#2,361 opened on Oct 12, 2022

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 (8 comments) (0 reactions) (2 assignees)Verilog (903 forks)auto 404
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Description

@antonblanchard just released the vlsiffra project. See the tweet @ https://twitter.com/antonblanchard/status/1580154261962657792 

Introducing https://github.com/antonblanchard/vlsiffra/ - a generator of fast and efficient standard cell adders, multipliers and multiply-adders. Written in Amaranth HDL, formally verified with #Yosys. #Verilator verification too With @OpenROAD_EDA + ASAP7 7nm a 32bit 3 cycle multiplier hits 2.7GHz

Some interesting aspects;

  • vlsiffra is written in the Amaranth HDL language which allows it to be very configurable, including
  • vlsiffra currently supports the SkyWater sky130hd, GlobalFoundries GF180MCU and ASAP7 PDKs and standard cell libraries.
  • vlsiffra only requires a few standard cells (full and half adders, 2 input xor, 2 input and, inverter as well as a couple of more complicated cells (ao21, ao22, ao33)

It seems like some of the output of this tool would make excellent OpenROAD regression tests / benchmarks.

Contributor guide

Research direction
Investigate how OpenROAD's regression test suite is organized and add examples generated by vlsiffra as new test cases following the existing patterns.
Tech stack
python
Domain
backend
Issue type
Test
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50