[libre-riscv-dev] [Bug 208] implement CORDIC in a general way sufficient to do transcendentals

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=208

--- Comment #18 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Michael Nolan from comment #17)
> I'm working on converting the floating point input to the fixed point value
> needed by the cordic. I've got my module decoding the float into sign,
> exponent, and mantissa with FPNumDecode, and the mantissa is missing the
> (implied) leading 1 bit. I'm also looking at the modules of fpdiv (div0.py
> and nmigen_div_experiment.py), and they don't seem to add that bit back in.
> Is there a way to have FPNumDecode generate a mantissa with the leading 1
> bit?

I think that's done in ieee754.fpcommon.denorm:
https://git.libre-soc.org/?p=ieee754fpu.git;a=blob;f=src/ieee754/fpcommon/denorm.py;h=350f413ede9858ae490059f6709b3454ea8a7f1e;hb=HEAD

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