Commits on Apr 16, 2022

1. Avoid unnecessary invalidations for invoked fallbacks …

   While investigating a report in https://discourse.julialang.org/t/package-load-time-regressions-in-v1-8-beta3/78875
   it became clear that some precompilation statements were not effective
   due to invalidation.  It turns out that these have the pattern
   
       f(arg::SpecificType) = invoke(f, Tuple{GenericType}, arg)
   
   When `f` gets compiled for a new subtype of `SpecificType`, the
   external cached MethodInstance gets invalidated because of the
   reliance on a less specific method.
   
   This is a hack that works around this issue for `copyto!`, but being
   able to mark calls as having been issued from an `invoke` would
   be a much better solution.

   

   timholy committed Apr 16, 2022
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