[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 #23 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #22)

> hmm, I think we should instead defined the scalar gfpmuladdsub to write to
> two separate registers, 

already ahead of you, ffmaddsub scalar targets RT and RT+1
the vector non-REMAP version targets RT+srcoffs,RT+VL+srcoffs
(i am dragging much of this out of longterm memory)

when i said this needs to fit exactly with what has already been
done i really meant it. everything is there, it was 8+ intensive
weeks developing REMAP FFT and we need modifying it like a hole
in the head.

there is more, in terms of Horizontal First Mode which shaped some
of the register name conventions, i just can't recall them immediately
but it allowed 5 regs to fit 3 SHAPES and use scalar temps and 2
vector ops all without changing the REMAPs inside the critical loop.

avoiding changing that by arbitrary register allocation is a high
priority. do spend some time looking closely at the ffmaddsub and
fft remap unit tests and run them.

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