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Reimplement the CF stub system using ObjC. The primary effect of this is to break the link-time dependency on the CF symbols, but it also improves performance a bit.

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One additional tweak (setting the scalar-aligned bit on foreign indices) had to be made to avoid a performance regression for long non-ASCII foreign strings.
This commit is contained in:
David Smith
2019-07-30 16:21:23 -07:00
parent d9fd3d3ec2
commit c5fc715746
6 changed files with 172 additions and 189 deletions
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2
stdlib/public/core/StringStorage.swift
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@@ -146,7 +146,7 @@ extension _AbstractStringStorage {
// CFString will only give us ASCII bytes here, but that's fine.
// We already handled non-ASCII UTF8 strings earlier since they're Swift.
if let otherStart = _cocoaUTF8Pointer(other) {
if let otherStart = _cocoaASCIIPointer(other) {
//We know that otherUTF16Length is also its byte count at this point
if count != otherUTF16Length {
return 0