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When existential containers are allocated for local variables, the
compiler knows the concrete type and can directly allocate storage.
The ABI tasks here is to:
determine whether it is even potentially useful to stack allocate some existential storage.
reserve a bit somewhere in the value-witness table that identifies
stack allocated storage so that COW existential support does the
right thing in these cases.
Additional Detail from JIRA
md5: c507678e18e70c7f8c12aafc83b03995
Issue Description:
When existential containers are allocated for local variables, the
compiler knows the concrete type and can directly allocate storage.
The ABI tasks here is to:
determine whether it is even potentially useful to stack allocate some existential storage.
reserve a bit somewhere in the value-witness table that identifies
stack allocated storage so that COW existential support does the
right thing in these cases.
@swift-ci create
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