alt Hacker NewsThe wiki says:
"Additional XMM (SSE) registers: Similarly, the number of 128-bit XMM registers (used for Streaming SIMD instructions) is also increased from 8 to 16...
"The original AMD64 architecture adopted Intel's SSE and SSE2 as core instructions."
https://en.wikipedia.org/wiki/X86-64
This wansn't v2?
Not sure what your question is. I dont see any contradiction with the parent comment. SSE went to version 4.2 (it gets complicated in the numbering and even naming). Only 1 and 2 were included in the base 64-bit ISA.