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[String] Define performance flags and plumb them throughout

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This commit is contained in:
Michael Ilseman
2018-10-28 16:48:37 -07:00
parent 752423b86c
commit 9d9f9005e3
12 changed files with 342 additions and 209 deletions
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4
stdlib/public/core/StringUnicodeScalarView.swift
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@@ -48,7 +48,7 @@ extension String.UnicodeScalarView: BidirectionalCollection {
@inlinable @inline(__always)
public func index(after i: Index) -> Index {
_sanityCheck(i < endIndex)
// TODO(UTF8): isKnownASCII bit fast-path...
// TODO(UTF8): isASCII bit fast-path...
if _fastPath(_guts.isFastUTF8) {
let len = _guts.fastUTF8ScalarLength(startingAt: i.encodedOffset)
@@ -65,7 +65,7 @@ extension String.UnicodeScalarView: BidirectionalCollection {
public func index(before i: Index) -> Index {
precondition(i.encodedOffset > 0)
if _fastPath(_guts.isFastUTF8) {
// TODO(UTF8): isKnownASCII bit fast-path...
// TODO(UTF8): isASCII bit fast-path...
let len = _guts.withFastUTF8 { utf8 -> Int in
return _utf8ScalarLength(utf8, endingAt: i.encodedOffset)