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More niche stuff:
* VNNI - VPDPBUSB is yet another "replaces 3 insns with one" example, in that case PMADDUBSW, PMADDWD, PADDD
* 52-bit IFMA, mostly interesting for crypto/big int folks
* VPMULTISHIFTQB in VBMI for bit wrangling
* The bfloat16 additions
* Fixed versions of RCP and RSQRT, namely RCP14 and RSQRT14, with an exact spec so they don't differ between Intel and AMD
* Vector leading zero count and pop count
* Math-library focused insns like VFIXUPIMM and VFPCLASS.