Third attempt for SUM

[safety0ff via Digitalmars-d]

On Sunday, 13 November 2016 at 16:56:30 UTC, Ilya Yaroshenko 
wrote:
>
> BTW, i have implemented sumOfLogs [1], it is more precise then 
> everything else.

Thanks, I was going to use 32.64 fixed point for my program but 
now I think I will get better precision modifying that to use a 
32 bit exponent field with a 1.64 fixed point field (to represent 
[1,2) normalized number.)

The [0.5,1) normalization due to frexp was confusing at first 
glance.