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[string] Skip unnecessary self UTF-16 length in isEqual

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For isEqual bridging comparisons, skip checking our own UTF-16 length when the
string we're comparing against is known to be ASCII.
This commit is contained in:
Michael Ilseman
2020-03-05 14:46:37 -08:00
parent 7ff3ecf2e5
commit d8f25be9fa
1 changed files with 1 additions and 2 deletions
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3
stdlib/public/core/StringUTF16View.swift
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@@ -146,8 +146,7 @@ extension String.UTF16View: BidirectionalCollection {
// For a BMP scalar (1-3 UTF-8 code units), advance past it. For a non-BMP
// scalar, use a transcoded offset first.
// TODO: do the ugly if non-transcoded make sure to scalar align thing...
// Also, can we just jump ahead 4 is transcoded is 1?
// TODO: If transcoded is 1, can we just skip ahead 4?
let idx = _utf16AlignNativeIndex(idx)
let len = _guts.fastUTF8ScalarLength(startingAt: idx._encodedOffset)