[Haskell-cafe] Freeze/thaw fusion

William Yager will.yager at gmail.com
Sat Aug 1 03:56:48 UTC 2015

Has anyone done any research into fusing operations that involve thawing
some data, mutating it, and then freezing it again?

Data.Vector does something similar; it turns vectors into streams, operates
on the streams, and then turns them back into vectors. It can fuse these
operations by removing intermediate  However, I've done a bit of
preliminary work on a fusion system that works on operations of the form

    runST $ do
        x' <- thaw x
        foo x'
        freeze x'

and yields promising results in some cases. This could be useful for data
structures that aren't stream-able, but suffer from lots of unnecessary
freezing and unfreezing.

This seems like the sort of thing that someone would have already done, so
I wanted to check if anyone knew of any previous work on this.

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