a variant of the SVP64RM class is needed which auto-generates
a convenient CSV-like version of decode1.vhdl with the fields
needed to decode SVP64 "EXTRA" (register) parts of svp64 prefix.
TODO: move RS from in1 to in3 in an automated fashion (DONE)
preliminary output here (pending data structures / types)
it should match precisely with the array lengths from decode1.vhdl, and the idea is that in decode2.vhdl wherever a decode_rom_t is used then a corresponding sv_decode_rom_t is also used.
if there is no entry and yet the instruction is SVP64-prefixed then an illegal instruction exception must be raised.
that was an alteration to sv_analysis.py to, instead of having a series of register names that are hard to look up, match up with decode1.vhdl in1/2/3 and make it easy to identify.
commit 00c03aad232bdfb4cf20d6afec12247b91105f97 (HEAD -> master, origin/master, origin/HEAD)
Author: Luke Kenneth Casson Leighton <email@example.com>
Date: Thu Mar 18 12:36:46 2021 +0000
update microwatt sv_decode.vhdl prototype with new sv_out2 column
1) the RS has been moved
2) a new "out2" column has been added including which EXTRA2/3 is used
to extend it