[libre-riscv-dev] popcount and parity

From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
To: Libre-RISCV General Development <libre-riscv-dev@lists.libre-riscv.org>
Subject: [libre-riscv-dev] popcount and parity
Date: Wed, 13 May 2020 23:20:16 +0100
Message-ID: <CAPweEDwz54BtCmw+anXZ4EKqHpi9xpUpEOajdJfUbcYAzPdM3w@mail.gmail.com> (raw)

jacob would you like to do popcount and parity, i remember you
mentioned a "best work" algorithm somewhere (referenced a wikipedia
page)? it resonated with me that it might be nice to add a general
class (of some kind) to nmutil for use in doing things like... ooo....
popcount.

here's where the two functions are in microwatt, feel free to use this
as a guide:
https://github.com/antonblanchard/microwatt/blob/master/logical.vhdl

and here's where they need to go in the logical pipeline:
https://git.libre-soc.org/?p=soc.git;a=blob;f=src/soc/logical/main_stage.py;h=622216bbf5c8d9f80e1ad04f0903f5b27e0f7102;hb=HEAD#l41

l.

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