[libre-riscv-dev] [isa-dev] Re: FP transcendentals (trigonometry, root/exp/log) proposal
andrew at sifive.com
Thu Aug 8 11:00:00 BST 2019
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
> 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]
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