3 Commits

Author	SHA1	Message	Date
Erik Eckstein	b6e9c4c5e4	TempLValueElimination: don't propagate alloc_stack which have access scopes ... If exclusivity is checked for the alloc_stack we must not replace it with the copy-destination. If the copy-destination is also in an access-scope this would result in an exclusivity violation which was not there before. Fixes a miscompile which results in a wrong exclusivity violation error at runtime. https://github.com/swiftlang/swift/issues/83924 rdar://159220436	2025-08-30 07:29:15 +02:00
Erik Eckstein	abbe0e8e95	TempLValueElimination: fix a stupid bug when combining copy_addr with a following destroy_addr ... This peephole optimization also combined the instructions if the `destroy_addr` appears before the `copy_addr` in the same basic block. https://github.com/swiftlang/swift/issues/82466 rdar://154236276	2025-06-25 08:09:55 +02:00
Erik Eckstein	2b9b2d243c	Optimizer: improve TempLValueOpt ... * re-implement the pass in swift * support alloc_stack liveranges which span over multiple basic blocks * support `load`-`store` pairs, copying from the alloc_stack (in addition to `copy_addr`) Those improvements help to reduce temporary stack allocations, especially for InlineArrays. rdar://151606382	2025-06-05 06:45:18 +02:00