I think carter has it still right that it happens in the backends.
If a new backend doesn't support these we could move this up into Cmm
though without much issue I think.
Am 28/10/2021 um 23:12 schrieb 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 <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
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