[Libre-soc-dev] pack/unpack

lkcl luke.leighton at gmail.com
Wed Sep 14 12:18:27 BST 2022


the epic saga on pack/unpack continues.

extending setvl with additional bits by leveraging the
24 bits as "extra arguments" is in effect embedding
a 64-bit *scalar* instruction into the Vector-Loop space.

this was illustrated by me attempting to create an exception
for the loop-enabling in ISACaller.

as in: when doing sv.setvl the simulator actually tried to do
a for-loop around "setvl"!

we therefore either need v3.1 EXT001 Prefixed setvl (psetvl)
or to add a secondary "svmgmt" instruction to set the two
pack/unpack bits in SVSTATE.

madness.  just to add pack/unpack.


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