Re: Preserving signbit for range operator

[Rik]

2/28/13

Daniel, Michael,

It turns out that preserving the signbit is quite straightforward.  I coded
up most of a changeset last night, but need to do some benchmarking and add
some tests for the new behavior before completing it.  The root of the
problem is that the signbit can be lost through addition.  The expression
we were using for calculating range values was val = base + inc * i where i
could run from 0 to num_elements - 1.  For the first value the expression
is val = base + 0 and (-0 + 0) == 0.

--Rik