On Thu, 23 Dec 2010 22:45:07 -0700, Andrei Alexandrescu
<[email protected]> wrote:
On 12/23/10 10:33 PM, Robert Jacques wrote:
On Thu, 23 Dec 2010 11:20:24 -0700, Andrei Alexandrescu
<[email protected]> wrote:
Per the recent discussion comparing D with Lua, tests suggest that
iota for double is too slow. This is a necessity if iota is a
bidirectional or random-access range. If we allow it to be a forward
range, then performance would be significantly increased.
Do you agree with making iota for floating-point types a forward range?
Andrei
I had thought the major slowdown was using code like 'start + step * i'
as opposed to 'current += step', which, although much faster is
fundamentally broken, as with floating point numbers x = (x+1), etc. Am
I mistaken?
Indeed you are correct.
Andrei
Then may I suggest we keep the correct, but slow, behavior for floats and
put a note in the docs on the performance/implementation? (Or at least
internally use reals internally to help mitigate the problem)
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