[libre-riscv-dev] div/mod algorithm written in python

[Jacob Lifshay]

i'll work on it after getting some sleep :)

On Wed, Jul 24, 2019, 03:27 Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:

> On Wed, Jul 24, 2019 at 9:28 AM Luke Kenneth Casson Leighton
> <lkcl at lkcl.net> wrote:
>
> > jacob what's the setup for RSQRT, i'm getting consistent answers of zero.
> >
> > changing this from 3 to 2 gives some non-zero answers
> >
> >         with m.Else():  # DivPipeCoreOperation.RSqrtRem
> >             m.d.comb += self.o.compare_lhs.eq(
> >                 1 << (self.core_config.fract_width * 3))
>
> ok it now "works".  of course, now, 1/3 of test_core.py unit tests
> completely fail, however the answers from FPRSQRT are now reasonably
> sensible.
>
> i have absolutely no idea how to "fix" this, jacob - you'll need to look
> at it.
>
> l.
>
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