[libre-riscv-dev] fp special functions

[Jacob Lifshay]

On Sun, Aug 4, 2019, 21:15 Hendrik Boom <hendrik at topoi.pooq.com> wrote:

> On Mon, Aug 05, 2019 at 04:49:13AM +0100, Luke Kenneth Casson Leighton
> wrote:
> >
> > am a fan of just saying "IEEE754" here.  exact results.  makes testing
> > easier, yes.  my feeling is: if people *really want* inaccuracy, it
> > should be as a sub-extension.
>
> Amdahl's 360 clones did their operations lat-bit accurately.  IBM's
> original didn't do them all correctly.  Amdahl was forced by its
> customers to install a switch that would force the machine to produce
> the same wrong answer as IBM's.
>
neat. same reason intel/amd won't fix the x87 fsin/fcos/fsincos
instructions.

Jacob