まちカドおるみん御嬢様“Compiler enabling is straightforward – a new REX2 prefix provides uniform access to the new registers across the legacy integer instruction set. Intel AVX instructions gain access via new bits defined in the existing EVEX prefix.”
なのでそれ以外のところもまた命令プリフィクス増えてる >>
Intel Details APX - Advanced Performance Extensions - Phoronix
https://www.phoronix.com/news/Intel-APX
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