Handling overflow and division by zero

[Nikita Karetnikov]

> I'm no expert on arithmetic, but I'd have thought that a well-designed
> and well-documented plan for handling arithmetic exceptions (as
> values) would be good.
>
> Start a wiki page on the GHC Trac!  
>
> Are there primops for Int, so the only issue is making ones for other types?

I've just put my notes here:
https://ghc.haskell.org/trac/ghc/wiki/ImprovedArithmeticPrimops

Let me know if this page doesn't answer your question.

Do I need to create a ticket, too?  In the testsuite, primops live
in files like this: testsuite/tests/primops/should_run/T7689.hs
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