On 11/18/2013 11:03 PM, Sieghard wrote:

> Even if it is larger than any of the other operands?

Yep. That is how it usually is done. Extend or sign-extend after the 
operation if the target is larger, truncate if it is smaller.

> Size extend always at runtime? 

Yep (If necessary): Adding leading sign bits for signed types and adding 
leading Zeros with unsigned types.

>>    - use signed if one operand is signed
> And what if another one of the same or larger bit size is not?
First extend either to appropriate bit count and then take care of 
different signedness of the two.

-Michael

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