Comment by leeter
7 hours ago
Pretty sure 3DNow's instruction space has been repurposed too. There are a few like that, or worse extremely similar but ever so slightly different between vendors or even generations of the same vendor. I won't claim to be an expert, this is all in IIRC territory for me.
No, the 0f 0f opcode (most of 3DNow was encoding-wise a single RMI-encoded opcode where the immediate specified the operation) and the 0f 0e opcode (FEMMS) were not repurposed by either Intel or AMD.