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Re: [cxx-conversion] Make double_int a class with methods and operators. (issue6443093)


Hi,

On Thu, 9 Aug 2012, Mike Stump wrote:

> > Ah.  For simple objects like double_int I prefer to have either all 
> > ops mutating or all ops non-mutating.
> 
> wide_int, which replaces double_int for int types, is always 
> non-mutating, by value interface.  In C++, it will be const & input 
> parameters, to avoid the copies and retain the performance. We maintain 
> a cache under it, and reuse out of it for the long lived objects, for 
> short lived, we just allocate the on the stack as needed.

Hmm.  And maintaining a cache is faster than 
passing/returning/manipulating two registers?


Ciao,
Michael.


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