Sema: Optimize Constraint layout to save 24 bytes #79882
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…mplementation Normal conformances, self conformances, and availability contexts cannot contain types with type variables, so there is no reason to duplicate the uniquing maps between the permanent arena and solver arena.
The largest union member was for SyntacticElement constraints; let's tail-allocate the ContextualTypeInfo instead of storing one in every constraint.
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If the precondition doesn't hold, we will return a pointer to some random memory, so it's best to always crash since this indicates something is seriously wrong.
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@swift-ci Please smoke test |
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@swift-ci Please test source compatibility |
AnthonyLatsis
approved these changes
Mar 10, 2025
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While building the standard library, the total size of all constraint solver arenas allocated goes down from 638Mb to 596Mb.
Fixes rdar://146459456