[LLVMdev] APFloat::convertToDouble asserts

[Dale Johannesen]

On Jul 9, 2010, at 12:59 PMPDT, Jochen Wilhelmy wrote:
>>> I wonder why APFloat::convertToDouble asserts if it is not an
>>> APFloat::IEEEdouble while the name "convertToDouble" suggests that  
>>> it
>>> converts when it is not a double.
>>
>> The conversion is to (host) double, as the name implies.  Among  
>> APFloat types, that is only implemented for APFloat::IEEEdouble.
>>
>
> yes, it's to host double ("convert this APFloat to double"),  
> therefore I hoped that it works for any APFloat type (otherwise I  
> would suggest a name such as getIfIEEEdouble() ).
> Is there a reason against it or would it be accepted if it would  
> work for any type?

I'd rather not.  The functionality you want is there, feed another  
APFloat type through APFloat::convert first.

Using host FP is not something that should be encouraged; the main  
point of APFloat is so people don't have to do that.  Why do you want  
to, btw?