first version of SVP64 Decoder done, covers most Modes, decodes register numbers 0-127 successfully.
https://git.libre-soc.org/?p=openpower-isa.git;a=blob;f=src/openpower/decoder/power_svp64_rm.py;h=81527ad5a84b285856a5a11237d443881b94c69d;hb=fc68ee12c54f7f096a2631a9254db30fe4cde4e8