[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 #4 from Jacob Lifshay <programmerjake at gmail.com> ---
also, for naming, we'd probably want to name these instructions gfbmadd,
gfbmul, gfbinv, etc. (Galois Field (binary) ...) because they're specifically
for the binary fields GF(2^n).

We may later want to add support for odd-prime fields GF(p), since they're also
used by some forms of elliptic curve cryptography:
* gfpadd -- Galois Field (prime) addition
* gfpsub -- Galois Field (prime) subtraction
* gfpmul
* gfpmadd
* gfpmsub

we probably won't want division or inverse cuz iirc those are crazy complex.

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