Re: [eigen] Decrease in performances

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> I guess it can easily be replaced by 128bit integer multiplication. I
> suggested that back then, but I guess it was ignored due to portability
> concerns:

For int32*int32 overflow detection on platforms lacking int128s, could
one use double*double operations and compare to
numeric_limits<int32>::max() since double can represent a seriously
wide range of integers exactly?

- Rhys

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