Differences in results when using the same function in CTFE and Runtime

[Nicholas Wilson]

On Thursday, 8 August 2024 at 10:31:32 UTC, Carsten Schlote wrote:
> Hi
> - Can CTFE be used under all circumstances when float numbers 
> of any precision are involved?
> - Or is this some kind of expected behaviour whenever floats 
> are involved?
> - Is the D CTFE documentation completely covering such possible 
> issues?
>
> I can imagine that bugs causes by such subtil differences might 
> be very difficult to fix.
>
>
> Any experiences or thought on this?
>

there are `toPrec`[1] intrinsics to solve exactly this issue of 
lack of truncation of precision.


[1]: 
https://github.com/dlang/dmd/blob/958ba9cbe3583830efe39505238939daa0dbd64c/druntime/src/core/math.d#L198-L214

> Greetz
> Carsten