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Advanced Micro Devices, Inc. or AMD, an American multinational semiconductor company based in Sunnyvale, California, and behind Intel the second-largest global supplier of microprocessors based on the x86 architecture and also one of the largest suppliers of graphics processing units. In 2003, AMD launched the Athlon 64 (Hammer, AMD64, K8) and pioneered the x86-64 instruction set. Until Intel introduced the Core 2 microarchitecture in 2006, AMD64 was the dominating architecture for computer chess in the 2000s. With the Zen micro-architecture and the release of the Ryzen processor in early 2017, it seems that AMD can recover lost ground. However, early Ryzen's BMI2 performance is worse, in particular using BMI2 PEXT in chess programs - one should conditionally compile using magic bitboards instead of PEXT bitboards, otherwise preferable for compatible Intel processors.

=Sponsoring=
 * WMCCC 1997
 * BELCT 2001

=Photos= Christophe Jolly and Walter Bannerman, Paris WMCCC 1997

Rebel vs Viswanathan Anand, Ischia, July 1998 - back of Ed Schröder  and Jeroen Noomen

Jochen Peussner and Roland Pfister, BELCT 2001

=x86 Architectures=

=SIMD Extensions=
 * AVX (since Bulldozer)
 * AVX2 (since Excavator)
 * MMX
 * 3DNow!
 * SSE
 * SSE2
 * SSE3
 * SSE4
 * SSE5 (not implemented)
 * XOP (Bulldozer only)

=General Purpose Extensions=
 * BMI
 * BMI2 (Zen)
 * TBM

=See also=
 * Intel
 * Microsoft

=Forum Posts=

2010 ...

 * Intel vs AMD: which does your engine prefer? by Albert Silver, CCC, November 04, 2011 » Intel
 * What is your take on AMD's new processor? by Tano-Urayoan Russi Roman, CCC, October 24, 2012

2015 ...

 * AMD's Ryzen launches March 2, outperforming Intel's Core i7 by Leo Anger, CCC, February 22, 2017
 * New AMD processors by Ingo Althöfer, The Computer-go Archives, March 03, 2017
 * Ryzen Fritz Chess Benchmarks ? by ralunger, Rybka Forum, March 03, 2017
 * Is anyone here already using a Ryzen 1800X processor ? by Aloisio Ponti, CCC, March 26, 2017
 * Re: Komodo 11.3 by Mark Lefler, CCC, March 04, 2018 » BMI2 PEXT, Komodo 11.3
 * Ryzen 2 and BMI2? by Steve Maughan, CCC, May 13, 2018 » BMI2
 * Re: Ryzen 2 and BMI2? by Joost Buijs, CCC, May 18, 2020 » AVX2, BMI2


 * Porting Stockfish to GCN on APUs...? by Nick Pelling, FishCooking, November 18, 2018 » Stockfish
 * AMD BMI2 question by Leo, CCC, March 10, 2019 » BMI2
 * PEXT/PDEP are even slower than you think on Zen by Gian-Carlo Pascutto, CCC, December 09, 2019 » BMI2 PEXT

2020 ...

 * AMD's X3D - HBM on CPU - memory wall by Srdja Matovic, CCC, March 08, 2020
 * Re: Ryzen 2 and BMI2? by Joost Buijs, CCC, May 18, 2020 » AVX2, BMI2

=External Links=
 * Advanced Micro Devices from Wikipedia
 * List of AMD CPU microarchitectures from Wikipedia
 * Intel Corp. v. Advanced Micro Devices, Inc. from Wikipedia
 * Advanced Micro Devices, Inc. v. Intel Corp. from Wikipedia
 * AMD Accelerated Processing Unit from Wikipedia
 * Graphics Core Next from Wikipedia
 * AMD Corporate Website
 * Inside AMD's Hammer: the 64-bit architecture behind the Opteron and Athlon 64 by Jon Stokes, ars technica, February 01, 2005
 * Understanding the detailed Architecture of AMD's 64 bit Core by Hans de Vries, September 21, 2003
 * AMD releases new Ryzen processor by Albert Silver, ChessBase News, March 03, 2017

=References= Up one Level