Julia equivalent of Python's "fsum" for floating point summation

[ffevotte]

@JeffreySarnoff

For the benefit of those less familiar with all this, when you have found a good, somewhat transportable approach … do let us know rather than assuming all who are interested would get the message from reading each part of the development. Thanks.

I’m not sure this is what you had in mind, but @elrod and I co-authored a paper that we’re submitting to the Correctness 2019 workshop (to be held in conjunction with SC’19). A preliminary version of the preprint is available here for anyone interested:

Accurate and Efficiently Vectorized Sums and Dot Products in Julia

(the deadline for submissions has been extended to August 19th, so we still have some time to take your comments / questions into account if you have some)