[6.0] Disable SILCombine::visitInjectEnumAddrInst for empty tuple types #73022
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kalebers
approved these changes
Apr 13, 2024
aschwaighofer
approved these changes
Apr 14, 2024
tbkka
approved these changes
Apr 15, 2024
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Explanation:
SILCombine::visitInjectEnumAddrInstdeletesinit_enum_data_addrandinject_enum_addrand creates an empty value to store into the destination addr when legal. Optional empty types can be initialized withinit_enum_data_addrbutinject_enum_addrcan be present only on some control flow paths. Applying this optimization can result in uninitialized tag information on some paths leading to miscompilations.Issue: rdar://126231554
Scope: Effects optionals of empty type which are fairly common due to some frameworks
Risk: Low. Disabling an optimization recently enabled.
Testing: Unit tests
Reviewer: @aschwaighofer