8-bit and 16-bit arithmetic

[Carter Schonwald]

I think thats done on a per backend basis (though theres been a lot of
changes since i last looked at some of the relevent pieces). (i'm actually
based in Cambridge MA for the next 1-2 years if you wanna brain storm IRL
sometime)

On Thu, Oct 28, 2021 at 4:59 PM Norman Ramsey <nr at cs.tufts.edu> wrote:

> On x86, GHC can translate 8-bit and 16-bit operations directly
> into the 8-bit and 16-bit machine instructions that the hardware
> supports.  But there are other platforms on which the smallest
> unit of arithmetic may be 32 or even 64 bits.  Is there a central
> module in GHC that can take care of rewriting 8-bit and 16-bit operations
> into 32-bit or 64-bit operations?  Or is each back end on its own
> for this?
>
> (One of my students did some nice work on implementing this transformation
> with a minimal set of sign-extension and zero-extension operations:
> https://www.cs.tufts.edu/~nr/pubs/widen.pdf.)
>
>
> Norman
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