On Tuesday, 17 May 2016 at 18:08:47 UTC, Timon Gehr wrote:
Right. Hence, the 80-bit CTFE results have to be converted to the final precision at some point in order to commence the runtime computation. This means that additional rounding happens, which was not present in the original program. The additional total roundoff error this introduces can exceed the roundoff error you would have suffered by using the lower precision in the first place, sometimes completely defeating precision-enhancing improvements to an algorithm.
WAT ? Is that really possible ?
