[6.2] Disable function signature optimization on functions with lifetime dependencies #82963
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…pendencies If a function has lifetime dependencies, disable FSO's dead param optimization. Dead params maybe dependency sources and we should not delete them. It is also problematic to dead code params that are not dependency sources, since lifetime dependent sources are stored as indices and deleting dead parameters will require recomputation of these indices.
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@swift-ci test |
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tbkka
approved these changes
Jul 11, 2025
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@swift-ci test windows platform |
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@swift-ci test windows platform |
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Explanation: If a function has lifetime dependencies, disable FSO's dead param optimization. Dead params maybe dependency sources and we should not delete them. It is also problematic to dead code params that are not dependency sources, since lifetime dependent sources are stored as indices and deleting dead parameters will require recomputation of these indices.
Scope: Functions with lifetime dependencies enabled under an experimental flag
Risk: Low. Disabling an illegal edge case in an optimization
Radar: TBD
Main PR: #82951
Reviewer: @atrick
Testing: CI testing