[libre-riscv-dev] IEEE754 FPU turning into ALU with Reservation Stations

[Aleksandar Kostovic]

ok will try to do something!

Have a nice trip to hong kong ! :)

On Fri, Mar 15, 2019 at 3:23 PM Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:

> On Fri, Mar 15, 2019 at 2:05 PM Aleksandar Kostovic
> <alexandar.kostovic at gmail.com> wrote:
> >
> > ok i am starting to get it
>
>  cool.  i have to go to hong kong tomorrow, will be back sunday night.
>   see if you can create a special cases class paid
> (FPMulSpecialCasesMod and FPMulSpecialCases) - these you _will_ have
> to copy from nmigen_add_experiment.py (and then adapt).  watch out for
> a couple of things:
>
>  (1) out_do_z is set inside the SpecialCasesMod class, and whether it
> is set or not is used to decide which new FSM state to move to in the
> FPMul(Add)SpecialCases class
>
>  (2) if you copy the code exactly, you'll need to add back in a
> denormalise stage: in add, i separated out denormalisation.
>
> if you want to see how to use the FPXXXSpecialCases class, see
> get_longer_fragment, do *not* copy the get_compact_fragment code yet.
>
> l.
>
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