80 bit floating point emulation

[Walter Bright]

On 7/8/2022 3:34 PM, IGotD- wrote:
> Is this something that is important?

For example, it'll get rid of all that ugly code in root/ and all the problems 
with VC's lack of support for 80 bits. It means dmd can be run on any platform. 
It makes 80 bits available to any D program that may need compatibility.

All this for a rather minor investment in coding, half of which has already been 
done (128 bit arithmetic).