Extended MMX (Cyrix EMMI) instructions

[Torinde]

What do you think of emulating Extended MMX (Cyrix EMMI) instructions?

• There is a CPU flag in Linux for those: cxmmx Cyrix MMX extensions
• Cyrix Extension to the Multimedia Instruction Set, Application Note 108 (some further docs and software are linked here)
• Opcodes overlap with SSE and other subsequent instructions, so it has to be selectable/option?
• Add EMMI and the 4 missing FPU instructons to the Cyrix 6x86MX 86Box/86Box#5284

[Sonicadvance1]

Implementing the instructions likely wouldn't be difficult but since the instruction encodings overlap it's a little annoying.
It would only be worth implementing if there was some interesting application that uses them and /doesn't/ have an accelerated MMX/SSE/3DNow! path.

[Torinde]

Clear, thanks!