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Mark the concatination of two strings as @readonly.

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Swift SVN r21061
This commit is contained in:
Nadav Rotem
2014-08-06 05:19:51 +00:00
parent 2217b29956
commit d96e940c36
2 changed files with 10 additions and 0 deletions
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2
stdlib/core/String.swift
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@@ -265,6 +265,7 @@ extension String : StringInterpolationConvertible {
public static func convertFromStringInterpolationSegment<T>(expr: T) -> String { return toString(expr) }
}
@semantics("readonly")
public func +(var lhs: String, rhs: String) -> String {
if (lhs.isEmpty) {
return rhs
@@ -273,6 +274,7 @@ public func +(var lhs: String, rhs: String) -> String {
return lhs
}
@semantics("readonly")
public func +(lhs: Character, rhs: Character) -> String {
var result = String(lhs)
result += String(rhs)

8
test/SILPasses/unused_containers.swift
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@@ -66,3 +66,11 @@ func string_interpolation() {
func string_interpolation2() {
"\(false) \(true)"
}
//CHECK-LABEL: string_plus
//CHECK: bb0:
//CHECK-NEXT: tuple
//CHECK-NEXT: return
func string_plus() {
"a" + "b"
}