Stefan Holdermans wrote:
Is there any data available on how often, in GHC-generated code,
closures are being updated in-place as opposed to and in comparison with
being replaced by indirections to their results?
How is it decided whether an in-place or an indirecting update is
performed?
The anser to these questions is easy. Closures are never updated in place :-)
GHC used to have selective update-in-place in the past (pre-4.00), but it had
highly complex interactions with various other aspects of the execution model,
so we removed it, or rather, didn't re-implement it in the big runtime rewrite
of 4.00.
Cheers,
Simon
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