[Issue 9937] CTFE floats don't overflow correctly

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=9937

Martin Nowak <code at dawg.eu> changed:

           What    |Removed                     |Added
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                 CC|                            |code at dawg.eu

--- Comment #23 from Martin Nowak <code at dawg.eu> ---
The real problem is that dmd (as only compiler) ignores `cast(float)myReal`
when the float is converted to a higher precision after that.
This optimization is semantically incorrect b/c rounding down can have side
effects (setting exception flags). It's also unexpected b/c C (and gdc/ldc)
correctly perform the rounding.

Also see
https://github.com/dlang/druntime/pull/1621#issuecomment-250426515

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