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

[Jacob Lifshay]

On Wed, Aug 7, 2019, 23:28 Luis Vitorio Cargnini <lvcargnini at ours-tech.com>
wrote:

> Hello,
>
> My $0.02 of contribution
> Regarding the comment of 3 platforms:
> > * Embedded Platform (where it's entirely up to the implementor, as there
> will be no interaction with public APIs)
> No, IEEE, ARM is an embedded platform and they implement IEEE in all of
> them
> > * UNIX Platform (which would require strict IEEE754 accuracy, for use in
> GNU libm, OR repeatable numericalist-acceptable accuracy)
> Standard IEEE, simple no 'new' on this sector.
> > * a *NEW* 3D Platform, where accuracy is defined by strict conformance
> to a high-profile standard e.g. OpenCL / Vulkan.
> No, simply use IEEE that it is all, and based on the IEEE standard you can
> measure the deviation in your system.
>
>
> No, just adopt IEEE-754, it is a standard, it is a standard for a reason.
> Anything out of IEEE-754, it does not conform with IEEE and for such you
> are on your own. However, you still can demonstrate your deviation from the
> standard.
>
Note that IEEE-754 specifies correctly rounded results for all the proposed
functions.