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Re: [Stds-754] IEEE 754 Revision, comments from IFIP WG 2.5
We would therefore prefer to have operations like
AddBinaryRoundingDirectionTowardPositive(a,b) and
AddBinaryRoundingDirectionTowardNegative(a,b), as well as similar
for the other elementary operations, also available.
If you used the ideas in this paper:
http://www.brics.dk/~barnie/RealLib/intervals.pdf#search=%22interval%20arithmetic%20sse%22
You could use round toward positive for all operations. As a side effect, it
maps more efficiently to SSE registers which can do 2 64 bit adds in parallel,
but they (currently) have to have the same rounding direction. No problem for
some people!
Bob