.. Copyright 2003-2025 by Wilson Snyder.
.. SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

************************
Contributors and Origins
************************

Authors
=======

When possible, please instead report bugs at `Verilator Issues
<https://verilator.org/issues>`_.

The primary author is Wilson Snyder <wsnyder@wsnyder.org>.

Major concepts by Paul Wasson, Duane Galbi, John Coiner, Geza Lore, Yutetsu
Takatsukasa, and Jie Xu.


Contributors
============

Many people have provided ideas and other assistance with Verilator.

Verilator is receiving significant development support from the `CHIPS
Alliance <https://chipsalliance.org>`_, and `Antmicro Ltd
<https://antmicro.com>`_.

Previous major corporate sponsors of Verilator, by providing significant
contributions of time or funds include: Antmicro Ltd., Atmel Corporation,
Compaq Corporation, Digital Equipment Corporation, Embecosm Ltd., Hicamp
Systems, Intel Corporation, Marvell Inc., Mindspeed Technologies Inc.,
MicroTune Inc., picoChip Designs Ltd., Sun Microsystems Inc., Nauticus
Networks Inc., SiCortex Inc, Shunyao CAD, and Western Digital Inc.

The contributors of major functionality are: Jeremy Bennett, Krzysztof
Bieganski, Byron Bradley, Lane Brooks, John Coiner, Duane Galbi, Arkadiusz
Kozdra, Geza Lore, Todd Strader, Yutetsu Takatsukasa, Stefan Wallentowitz,
Paul Wasson, Jie Xu, and Wilson Snyder.

Some of the people who have provided ideas, and feedback for Verilator
include:

David Addison, Tariq B. Ahmad, Nikana Anastasiadis, John David Anglin,
Frederic Antonin, Hans Van Antwerpen, Vasu Arasanipalai, Jens Arm, Rohan
Arshid, Valentin Atepalikhin, Philip Axer, Gökçe Aydos, Chris Bachhuber,
Filip Badáň, Adam Bagley, Sharad Bagri, James Bailey, Robert Balas, Marco
Balboni, Matthew Ballance, Ricardo Barbedo, Andrew Bardsley, Ilya Barkov,
Matthew Barr, Geoff Barrett, Kaleb Barrett, Daniel Bates, Julius Baxter,
Michael Berman, Jean Berniolles, Victor Besyakov, Narayan Bhagavatula,
Moinak Bhattacharyya, Kritik Bhimani, David Biancolin, Krzysztof Bieganski,
Michael Bikovitsky, David Binderman, Piotr Binkowski, Johan Björk, David
Black, Tymoteusz Blazejczyk, Scott Bleiweiss, David van der Bokke, Daniel
Bone, Guy Bonneau, Krzysztof Boroński, Gregg Bouchard, Christopher
Boumenot, Paul Bowen-Huggett, Nick Bowler, Bryan Brady, Maarten De
Braekeleer, Liam Braun, Charlie Brej, J Briquet, John Brownlee, KC
Buckenmaier, Gijs Burghoorn, Jeff Bush, Lawrence Butcher, Tony Bybell, Iru
Cai, Ted Campbell, Anthony Campos, Chris Candler, Lauren Carlson, Gregory
Carver, Donal Casey, Sebastien Van Cauwenberghe, Alex Chadwick, Greg
Chadwick, Marcel Chang, Aliaksei Chapyzhenka, Chih-Mao Chen, Guokai Chen,
Kefa Chen, Terry Chen, Yangyu Chen, Yi-Chung Chen, Yurii Cherkasov,
Hennadii Chernyshchyk, Enzo Chi, Bartłomiej Chmiel, Robert A. Clark, Ryan
Clarke, Allan Cochrane, Keith Colbert, Quentin Corradi, Nassim Corteggiani,
Gianfranco Costamagna, February Cozzocrea, Sean Cross, George Cuan, Michal
Czyz, Joe DErrico, Jim Dai, Lukasz Dalek, Laurens van Dam, Gunter
Dannoritzer, Ashutosh Das, Julian Daube, Greg Davill, Bernard Deadman,
Peter Debacker, Josse Van Delm, John Demme, Mike Denio, John Deroo, Philip
Derrick, Aadi Desai, John Dickol, Ruben Diez, Danny Ding, Jacko Dirks, Ivan
Djordjevic, Brad Dobbie, Paul Donahue, Jonathon Donaldson, Anthony Donlon,
Caleb Donovick, Larry Doolittle, Leendert van Doorn, Sebastian Dressler,
Jonathan Drolet, Justin Yao Du, Maciej Dudek, Alex Duller, Jeff Dutton,
Tomas Dzetkulic, Usuario Eda, Charles Eddleston, Chandan Egbert, Joe Eiler,
Ahmed El-Mahmoudy, Trevor Elbourne, Mats Engstrom, Robert Farrell, Julien
Faucher, Olivier Faure, Eugene Feinberg, Eugen Fekete, Fabrizio Ferrandi,
Udi Finkelstein, Brian Flachs, Bill Flynn, Andrea Foletto, Alex Forencich,
Aurelien Francillon, Bob Fredieu, Manuel Freiberger, Mostafa Gamal, Vito
Gamberini, Mostafa Garnal, Benjamin Gartner, Christian Gelinek, Richard E
George, Peter Gerst, Glen Gibb, Michael Gielda, Barbara Gigerl, Nimrod
Gileadi, Shankar Giri, Dan Gisselquist, Szymon Gizler, Petr Gladkikh, Sam
Gladstone, Mariusz Glebocki, Embedded Go, Andrew Goessling, Amir Gonnen,
Chitlesh Goorah, Tomasz Gorochowik, Kai Gossner, Tarik Graba, Sergi
Granell, Al Grant, Nathan Graybeal, Alexander Grobman, Qian Gu, Xuan Guo,
Prabhat Gupta, Deniz Güzel, Driss Hafdi, Abdul Hameed, Neil Hamilton, James
Hanlon, Tang Haojin, Øyvind Harboe, Jannis Harder, David Harris, Junji
Hashimoto, Thomas Hawkins, Mitch Hayenga, Harald Heckmann, Robert Henry,
Stephen Henry, Sebastian Hesselbarth, David Hewson, Jamey Hicks, Joel
Holdsworth, Andrew Holme, Peter Holmes, Hiroki Honda, Alex Hornung,
Pierre-Henri Horrein, David Horton, Peter Horvath, Jae Hossell, Kuoping
Hsu, Shou-Li Hsu, Teng Huang, Steven Hugg, Alan Hunter, James Hutchinson,
Tim Hutt, Ehab Ibrahim, Edgar E. Iglesias, Shahid Ikram, Jamie Iles, Fuad
Ismail, Vighnesh Iyer, Ben Jackson, Daniel Jacques, Shareef Jalloq, Marlon
James, Krzysztof Jankowski, Eyck Jentzsch, HyungKi Jeong, Iztok Jeras,
Pawel Jewstafjew, Alexandre Joannou, James Johnson, Christophe Joly, Justin
Jones, William D. Jones, Abe Jordan, Larry Darryl Lee Jr., Franck Jullien,
James Jung, Mike Kagen, Arthur Kahlich, Kaalia Kahn, Guy-Armand Kamendje,
Vasu Kandadi, Yoshitomo Kaneda, Kanad Kanhere, Patricio Kaplan, Pieter
Kapsenberg, Rafal Kapuscik, Ralf Karge, Per Karlsson, Dan Katz, Sol
Katzman, Ian Kennedy, Ami Keren, Fabian Keßler, Michael Killough, Sun Kim,
Jonathan Kimmitt, Olof Kindgren, Kevin Kiningham, Cameron Kirk, Dan
Kirkham, Aleksander Kiryk, Sobhan Klnv, Gernot Koch, Jack Koenig, Soon Koh,
Nathan Kohagen, Steve Kolecki, Brett Koonce, Will Korteland, Andrei
Kostovski, Wojciech Koszek, Varun Koyyalagunta, Arkadiusz Kozdra, Markus
Krause, David Kravitz, Adam Krolnik, Roland Kruse, Mahesh Kumashikar,
Andreas Kuster, Sergey Kvachonok, Charles Eric LaForest, Kevin Laeufer, Ed
Lander, Steve Lang, Pierre Laroche, Stephane Laurent, Walter Lavino,
Christian Leber, David Ledger, Alex Lee, Larry Lee, Yoda Lee, Michaël
Lefebvre, Dag Lem, Igor Lesik, John Li, Kay Li, Zixi Li, Davide Libenzi,
Nandor Licker, Eivind Liland, Ícaro Lima, Kevin Lin, Yu-Sheng Lin, Charlie
Lind, Andrew Ling, Jiuyang Liu, Joey Liu, Paul Liu, Derek Lockhart, Jake
Longo, Geza Lore, Arthur Low, Jose Loyola, Stefan Ludwig, Dan Lussier,
Konstantin Lübeck, Fred Ma, Liwei Ma, Duraid Madina, Oleh Maksymenko, Affe
Mao, Julien Margetts, Chick Markley, Alexis Marquet, Mark Marshall, Alfonso
Martinez, Unai Martinez-Corral, Adrien Le Masle, Yves Mathieu, Vladimir
Matveyenko, Patrick Maupin, Stan Mayer, Jordan McConnon, Conor McCullough,
Jason McMullan, Elliot Mednick, Yuan Mei, Andy Meier, Luiza de Melo,
Rodrigo A. Melo, Benjamin Menküc, Jake Merdich, David Metz, Wim Michiels,
Miodrag Milanović, Darryl Miles, Kevin Millis, Andrew Miloradovsky, David
Moberg, Wai Sum Mong, Peter Monsson, Anthony Moore, Sean Moore, Stuart
Morris, Dennis Muhlestein, John Murphy, Matt Myers, Nathan Myers, Richard
Myers, Alex Mykyta, Eric Müller, Dimitris Nalbantis, Peter Nelson, Felix
Neumärker, Bob Newgard, Cong Van Nguyen, Rachit Nigam, Toru Niina, Paul
Nitza, Yossi Nivin, Pete Nixon, Lisa Noack, Mark Nodine, Michael Nolan,
Andrew Nolte, Joseph Nwabueze, Kevin Nygaard, Kuba Ober, Krzysztof
Obłonczek, Andreas Olofsson, Baltazar Ortiz, Aleksander Osman, Don Owen,
Tim Paine, Deepa Palaniappan, James Pallister, Vassilis Papaefstathiou,
Sanggyu Park, Brad Parker, Risto Pejašinović, Seth Pellegrino, Morten Borup
Petersen, Dan Petrisko, Wesley Piard, Maciej Piechotka, David Pierce, Cody
Piersall, T. Platz, Michael Platzer, Dominic Plunkett, Nolan Poe, David
Poole, Michael Popoloski, Roman Popov, Aylon Chaim Porat, Oron Port, Rich
Porter, Rick Porter, Stefan Post, Niranjan Prabhu, Damien Pretet, Harald
Pretl, Bill Pringlemeir, Usha Priyadharshini, Mark Jackson Pulver, Prateek
Puri, Han Qi, Jiacheng Qian, Marshal Qiao, Raynard Qiao, Yujia Qiao, Jasen
Qin, Frank Qiu, Nandu Raj, Kamil Rakoczy, Danilo Ramos, Drew Ranck, Chris
Randall, Anton Rapp, Josh Redford, Odd Magne Reitan, Frédéric Requin,
Dustin Richmond, Samuel Riedel, Alberto Del Rio, Eric Rippey, Narcis Rodas,
Oleg Rodionov, Ludwig Rogiers, Paul Rolfe, Michail Rontionov, Arjen
Roodselaar, Arthur Rosa, Tobias Rosenkranz, Yernagula Roshit, Ryszard
Rozak, Huang Rui, Graham Rushton, Jan Egil Ruud, Denis Rystsov, Pawel
Sagan, Robert Sammelson, Adrian Sampson, John Sanguinetti, Josep Sans, Luca
Sasselli, Martin Scharrer, Martin Schmidt, Jonathan Schröter, Julie
Schwartz, Galen Seitz, Sam Shahrestani, Joseph Shaker, Mark Shaw, Salman
Sheikh, Zhou Shen, Hao Shi, James Shi, Michael Shinkarovsky, Rafael
Shirakawa, Jeffrey Short, S Shuba, Fan Shupei, Ethan Sifferman, Anderson
Ignacio da Silva, Rodney Sinclair, Ameya Vikram Singh, Sanjay Singh, Frans
Skarman, Nate Slager, Steven Slatter, Mladen Slijepcevic, Brian Small,
Garrett Smith, Gus Smith, Tim Snyder, Maciej Sobkowski, Stan Sokorac, Alex
Solomatnikov, Flavien Solt, Wei Song, Trefor Southwell, Martin Stadler, Art
Stamness, David Stanford, Krzysztof Starecki, Baruch Sterin, John
Stevenson, Pete Stevenson, Patrick Stewart, Rob Stoddard, Tood Strader,
John Stroebel, Ray Strouble, Sven Stucki, Howard Su, Udaya Raj Subedi,
Emerson Suguimoto, Gene Sullivan, Qingyao Sun, Renga Sundararajan, Kuba
Sunderland-Ober, Gustav Svensk, Rupert Swarbrick, Jevin Sweval, Paul
Swirhun, Shinya T-Y, Thierry Tambe, Jesse Taube, Drew Taussig, Christopher
Taylor, Greg Taylor, Jose Tejada, Sören Tempel, Peter Tengstrand, Wesley
Terpstra, Rui Terra, Stefan Thiede, Justin Thiel, Gary Thomas, Ian
Thompson, Kevin Thompson, Mike Thyer, Hans Tichelaar, Tudor Timi, Viktor
Tomov, Steve Tong, Topa Topino, Àlex Torregrosa, Topa Tota, Michael
Tresidder, Lenny Truong, David Turner, Neil Turton, Hideto Ueno, Mike
Urbach, Joel Vandergriendt, Srini Vemuri, Srinivasan Venkataramanan, Yuri
Victorovich, Ivan Vnučec, Bogdan Vukobratovic, Holger Waechtler, Philipp
Wagner, Stefan Wallentowitz, Johannes Walter, CY Wang, Chuxuan Wang, Shawn
Wang, Yilou Wang, Zhanglei Wang, Greg Waters, Thomas Watts, Eugene Weber,
John Wehle, Tianrui Wei, David Welch, Thomas J Whatson, Martin Whitaker,
Marco Widmer, Leon Wildman, Daniel S. Wilkerson, Daniel Wilkerson, Gerald
Williams, Trevor Williams, Don Williamson, Jan Van Winkel, Jeff Winston,
Joshua Wise, Clifford Wolf, Johan Wouters, Paul Wright, Tobias Wölfel,
Junyi Xi, Ding Xiaoliang, Liu Xiaoyi, Jinyan Xu, Mandy Xu, Pengcheng Xu,
Shanshan Xu, Yan Xu, Yinan Xu, SU YANG, Felix Yan, Jiaxun Yang, Luke Yang,
Amir Yazdanbakhsh, Chentai (Seven) Yuan, Florian Zaruba, Mat Zeno, Keyi
Zhang, Xi Zhang, Huanghuang Zhou, Yike Zhou, Jiamin Zhu, Ryan Ziegler.

Thanks to them, and all those we've missed mentioning above, and to those
whom have wished to remain anonymous.


Historical Origins
==================

Verilator was conceived in 1994 by Paul Wasson at the Core Logic Group at
Digital Equipment Corporation.  The Verilog code that was converted to C
was then merged with a C-based CPU model of the Alpha processor and
simulated in a C-based environment called CCLI.

In 1995 Verilator started being used for Multimedia and Network Processor
development inside Digital.  Duane Galbi took over the active development
of Verilator, and added several performance enhancements, and CCLI was
still being used as the shell.

In 1998, through the efforts of existing DECies, mainly Duane Galbi,
Digital graciously agreed to release the source code.  (Subject to the code
not being resold, which is compatible with the GNU Public License.)

In 2001, Wilson Snyder took the kit, added a SystemC mode, and called
it Verilator2.  This was the first packaged public release.

In 2002, Wilson Snyder created Verilator 3.000 by rewriting Verilator from
scratch in C++.  This added many optimizations, yielding about a 2-5x
performance gain.

In 2009, major SystemVerilog and DPI language support was added.

In 2018, Verilator 4.000 was released with multithreaded support.

In 2019, Verilator joined the `CHIPS Alliance
<https://chipsalliance.org>`_.

In 2022, Verilator 5.000 was released with IEEE scheduling semantics,
fork/join, delay handling, DFG performance optimizations, and other
improvements.

Currently, various language features and performance enhancements are added
as the need arises, focusing on completing Universal Verification
Methodology (UVM, IEEE 1800.2-2017) support.