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[SR-13005] (B as? D).unsafelyUnwrapped should optimize better #55450

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dabrahams opened this issue Jun 13, 2020 · 0 comments
Open

[SR-13005] (B as? D).unsafelyUnwrapped should optimize better #55450

dabrahams opened this issue Jun 13, 2020 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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@dabrahams
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Previous ID SR-13005
Radar None
Original Reporter @dabrahams
Type Bug
Additional Detail from JIRA
Votes 0
Component/s
Labels Bug
Assignee None
Priority Medium

md5: 2f380b001bafaf01faf84d26648497b3

Issue Description:

testMe2 should generate equivalent code to testMe1, but instead it generates something that includes the call to _swift_dynamicCastClass.

class B {  }

class D: B {  }

func testMe1(b: B) -> D {
  unsafeDowncast(b, to: D.self)
}

func testMe2(b: B) -> D {
  (b as? D).unsafelyUnwrapped
}
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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@dabrahams