[Libre-soc-bugs] [Bug 782] add galois field bitmanip instructions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=782

--- Comment #28 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
https://git.libre-soc.org/?p=libreriscv.git;a=blob;f=openpower/sv/gf2.py;hb=HEAD

i dropped the 2 functions gf2MUL and gf2divmod into a file to play
with and they work well.  gf_invert however did not, it needs investigating
after i made a couple of changes.


with some though gf2MUL can be seen to be standard long multiplication
in binary (XOR instead of the normal add) with standard modulo as well,
even that is analogous.

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