[libre-riscv-dev] [isa-dev] Re: FP transcendentals (trigonometry, root/exp/log) proposal

[Andrew Waterman]

On Thu, Aug 8, 2019 at 2:41 AM lkcl <luke.leighton at gmail.com> wrote:

>
>
> On Thursday, August 8, 2019 at 7:30:38 AM UTC+1, waterman wrote:
>
>>
>> ISA-level support for correctly rounded transcendentals is speciously
>> attractive, but its utility is not clearly evident and is possibly
>> negative.
>>
>
> wait... hang on: there are now *four* potential Platforms against which
> this statement has to be verified.  are you saying that for a *UNIX*
> platform that correctly-rounded transcendentals are potentially undesirable?
>

The sentence you quoted began with the adjective "ISA-level".  We happily
provide correctly rounded transcendental math on Linux as-is.


>
>> It does not make sense to allocate opcode space under these circumstances.
>>
>
> [reminder and emphasis: there are potentially *four* completely separate
> and distinct Platforms, all of which share / need these exact same opcodes]
>
> l.
>
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