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0a71d0fbea
If the branch-block injects a certain enum case and the destination switches on that enum, it's worth jump threading. E.g.
inject_enum_addr %enum : $*Optional<T>, #Optional.some
... // no memory writes here
br DestBB
DestBB:
... // no memory writes here
switch_enum_addr %enum : $*Optional<T>, case #Optional.some ...
This enables removing all code with optionals in a loop, which iterates over an array of address-only elements, e.g.
func test<T>(_ items: [T]) {
for i in items {
print(i)
}
}
18 lines
593 B
Swift
18 lines
593 B
Swift
// RUN: %target-swift-frontend -primary-file %s -O -sil-verify-all -module-name=test -emit-sil | %FileCheck %s
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// REQUIRES: swift_stdlib_no_asserts,optimized_stdlib
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// Check that we can eliminate all optionals from a loop which is iterating
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// over an array of address-only elements.
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// CHECK-LABEL: sil @$s4test0A18_no_optionals_usedyySayxGlF : $@convention(thin) <T> (@guaranteed Array<T>) -> () {
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// CHECK-NOT: Optional
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// CHECK: } // end sil function '$s4test0A18_no_optionals_usedyySayxGlF'
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public func test_no_optionals_used<T>(_ items: [T]) {
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for i in items {
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print(i)
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}
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}
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