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93d3226790
This allows to eliminate a dead stack location which contains an existential. rdar://problem/32272199
32 lines
698 B
Swift
32 lines
698 B
Swift
// RUN: %target-swift-frontend -O -emit-sil -parse-as-library %s | %FileCheck %s
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protocol E {
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func f() -> Bool
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}
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protocol P {
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associatedtype A = Int
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}
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public struct X : P, E {
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func f() -> Bool { return true }
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}
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func g<T : P>(_ x : T) -> Bool {
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if let y = x as? E { return y.f() }
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return false
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}
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// Check that this function can be completely constant folded and no alloc_stack remains.
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// CHECK-LABEL: sil @$s16dead_alloc_stack6testitySbAA1XVF
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// CHECK: bb0({{.*}}):
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// CHECK-NEXT: integer_literal
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// CHECK-NEXT: struct
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// CHECK-NEXT: return
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// CHECK-NEXT: } // end sil function '$s16dead_alloc_stack6testitySbAA1XVF'
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public func testit(_ x: X) -> Bool {
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return g(x)
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}
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