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 <n...@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 > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs >
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