[Issue 7455] Allow a cast to discard precision from a floating point during constant folding

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7455



--- Comment #9 from Martin Nowak <code at dawg.eu> 2013-10-30 11:55:13 PDT ---
(In reply to comment #8)
> Programs that rely on a maximum accuracy need to be rethought.
>
It's more like programs that rely on a defined precision.
When I write cast(float)a == cast(float)b then I want to compare two numbers
that have been converted to floats. I understand your point that if 32-bit
floats were no longer supported by a CPU we'd have troubles to implement this,
but D defines a native float type with specified precision.

Also C99 added a rule that casts and assignments are not allowed to use higher
precision.
http://stackoverflow.com/questions/503436/how-to-deal-with-excess-precision-in-floating-point-computations#answer-503523

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