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6a9d08793a
Replaces an alloc_stack of an enum by an alloc_stack of the payload if only one enum case (with payload) is stored to that location. For example: %loc = alloc_stack $Optional<T> %payload = init_enum_data_addr %loc store %value to %payload ... %take_addr = unchecked_take_enum_data_addr %loc %l = load %take_addr is transformed to %loc = alloc_stack $T store %value to %loc ... %l = load %loc https://bugs.swift.org/browse/SR-12710
27 lines
778 B
Swift
27 lines
778 B
Swift
// RUN: %target-swift-frontend -O -module-name=test -emit-sil -primary-file %s | %FileCheck %s
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protocol P { associatedtype A = Int }
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protocol Q : P {}
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protocol B { var x: Int { get } }
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struct Y<T> {}
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extension Y : B where T : Q { var x: Int { 0 }}
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extension P {
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var z: Int? { (Y<Self>() as? B)?.x }
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}
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struct X : Q {
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// Check that this getter can be folded to a simple "return 0"
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// CHECK-LABEL: sil hidden @$s4test1XV0A2MeSiSgvg : $@convention(method) (X) -> Optional<Int> {
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// CHECK: bb0(%0 : $X):
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// CHECK-NEXT: integer_literal ${{.*}}, 0
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// CHECK-NEXT: struct $Int
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// CHECK-NEXT: enum $Optional<Int>, #Optional.some!enumelt
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// CHECK-NEXT: return %3 : $Optional<Int>
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// CHECK-NEXT: } // end sil function '$s4test1XV0A2MeSiSgvg'
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var testMe: Int? { z }
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}
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