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Add benchmarks for Substring.dropFirst(_:) and dropLast(_:) #32473

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Merged
merged 2 commits into from
Jun 25, 2020
Merged

Add benchmarks for Substring.dropFirst(_:) and dropLast(_:) #32473

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068ef83
Add benchmarks for Substring.dropFirst(_:) and dropLast(_:)
natecook1000 Jun 19, 2020
3aeead4
Fiddle with the iteration count and length
natecook1000 Jun 22, 2020
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20 changes: 20 additions & 0 deletions benchmark/single-source/Substring.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@ public let SubstringTest = [
BenchmarkInfo(name: "EqualSubstringString", runFunction: run_EqualSubstringString, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "EqualSubstringSubstring", runFunction: run_EqualSubstringSubstring, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "EqualSubstringSubstringGenericEquatable", runFunction: run_EqualSubstringSubstringGenericEquatable, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "SubstringDropFirst1", runFunction: run_SubstringDropFirst1, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "SubstringDropLast1", runFunction: run_SubstringDropLast1, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "LessSubstringSubstring", runFunction: run_LessSubstringSubstring, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "LessSubstringSubstringGenericComparable", runFunction: run_LessSubstringSubstringGenericComparable, tags: [.validation, .api, .String]),
BenchmarkInfo(name: "StringFromLongWholeSubstring", runFunction: run_StringFromLongWholeSubstring, tags: [.validation, .api, .String]),
Expand All @@ -34,6 +36,8 @@ let longWide = "fὢasὢodὢijὢadὢolὢsjὢalὢsdὢjlὢasὢdfὢijὢ
let (s1, ss1) = equivalentWithDistinctBuffers()
let (s2, ss2) = equivalentWithDistinctBuffers()

let quiteLong = String(repeating: "0", count: 15_000)[...]

@inline(never)
public func run_SubstringFromLongString(_ N: Int) {
var s = longWide
Expand Down Expand Up @@ -126,6 +130,22 @@ public func run_EqualSubstringSubstringGenericEquatable(_ N: Int) {
}
}

@inline(never)
public func run_SubstringDropFirst1(_ N: Int) {
let s = quiteLong
for _ in 1...N*1000 {
blackHole(!s.dropFirst(1).isEmpty)
}
}

@inline(never)
public func run_SubstringDropLast1(_ N: Int) {
let s = quiteLong
for _ in 1...N*1000 {
blackHole(!s.dropLast(1).isEmpty)
}
}

/*
func checkEqual<T, U>(_ x: T, _ y: U)
where T : StringProtocol, U : StringProtocol {
Expand Down