Ayaz Hafiz 26f08c999c Store interened wrapped layout of lambda set on LambdaSet struct ... The `LambdaSet` struct is frequently used independently to examine how a lambda set should be packed or unpacked. However, it is also often converted into a full layout via `Layout::LambdaSet(LambdaSet)` to be a part of function arguments, for example. In preparing to intern all layouts, we need a way to cheaply go from a `lambda_set` to an interned `Layout::LambdaSet(lambda_set)`, since this is a very common operation. The proposed solution is to keep the wrapped layout cached on `LambdaSet` itself, which this PR does. The tricky bit of inserting a lambda set is we need to fill in the interned `full_layout` only after the lambda set is inserted, but we don't want to allocate a new interned slot if the same lambda set layout has already been inserted with a different `full_layout` slot. For example, if we insert `LambdaSet { set : [A] }` twice in two different threads, we want the `full_layout` they map to to be the same. So we nede to check if an interned representation with a full_layout exists, before we allocate a new full_layout and insert a fresh lambda set. So, - check if the "normalized" lambda set (with a void full_layout slot) maps to an inserted lambda set in - in a thread-local cache, or globally - if so, use that one immediately - otherwise, allocate a new (global) slot, intern the lambda set, and then fill the slot in - save the interned layout and lambda set mapping thread-locally		2023-01-10 09:47:13 -06:00
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intern.rs	Store interened wrapped layout of lambda set on LambdaSet struct	2023-01-10 09:47:13 -06:00