[Libre-soc-isa] [Bug 213] SimpleV Standard writeup needed

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri Nov 20 18:11:19 GMT 2020


--- Comment #108 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #107)

> which means that applying the elwidth override to 64 bit opcodes gives us
> "full coverage" of available options, as long as an override can be applied
> to each of src and dest.

i mean on conversion ops, MVs etc.

> *underneath* the actual ALU may go "er i don't have FP16 HW so i will do
> this as FP32 then chuck away some bits" however that's down to individual
> implementors to make that decision and yet 

i did this in spike.  it was far too inconvenient to add elwidth override
interaction on FP16-FP32-FP64 arithmetic ao i did everything at FP64 and
converted in and out as needed.

this had disadvantages in that some exceptions or rounding which should have
occurred did not.

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