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an x86-64 expansion of [[Bit-Twiddling#BitManipulation|bit-manipulation]] instructions by [[Intel]]. Like [[BMI1]], BMI2 employs [https://en.wikipedia.org/wiki/VEX_prefix VEX prefix] encoding to support three-operand syntax with non-destructive source operands on 32- or 64-bit general-purpose registers. Along with [[AVX2]], BMI2 was expected to be part of [[Intel|Intel's]] [https://en.wikipedia.org/wiki/Haswell_%28microarchitecture%29 Haswell] architecture planned for 2013, but was not yet available in one of the first tested Haswell generations of mid 2013 as reported by Andreas Stiller from the German c't magazine <ref>[http://de.linkedin.com/pub/andreas-stiller/a/381/aa9 Andreas Stiller] ('''2013'''). ''[http://www.heise.de/ct/inhalt/2013/14/114/ Der Rechenkünstler]''. [http://www.heise.de/ct/ c't Magazin für Computertechnik] 14/2013, p. 114-119 (German)</ref>. BMI2 requires bit 8 set in EBX of [https://en.wikipedia.org/wiki/CPUID CPUID] with EAX=07H, ECX=0H <ref>[http://software.intel.com/en-us/articles/how-to-detect-new-instruction-support-in-the-4th-generation-intel-core-processor-family How to detect New Instruction support in the 4th generation Intel® Core™ processor family | Intel® Developer Zone] by [http://software.intel.com/de-de/user/76418 Max Locktyukhin], August 05, 2013</ref>. In 2017, BMI2 was further incorporated in [[AMD|AMD's]] [https://en.wikipedia.org/wiki/Zen_(microarchitecture) Zen-architecture] but so far with a slow implementation of critical instructions such as [[#PDEP|PDEP]] and [[#PEXT|PEXT]] <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=32016 Ryzen Fritz Chess Benchmarks ?] by ralunger, [[Computer Chess Forums|Rybka Forum]], March 03, 2017</ref> <ref>[https://www.reddit.com/r/Amd/comments/60i6er/ryzen_and_bmi2_strange_behavior_and_high_latencies/ Ryzen and BMI2: Strange behavior and high latencies] by DonnieTinyHands, [https://en.wikipedia.org/wiki/Reddit Reddit], March 20, 2017 » [[AMD]], [[#PEXT|BMI2 PEXT]]</ref><ref>[https://www.techpowerup.com/forums/threads/amd-announces-a-red-october-zen-3-on-october-8-rdna2-on-october-28.271981/page-2#post-4344965 Re: AMD Announces a Red October: Zen 3 on October 8, RDNA2 on October 28] by dragontamer5788, [https://www.techpowerup.com/forums/ TechPowerUp Forum], September 9, 2020</ref> .