[4.0][stdlib] Speed up Character construction #9282
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…cript (swiftlang#9252) This adds a fast path for single-code-unit Character construction. Rather than use the general purpose String based initializer (which then repeats grapheme breaking to ensure a trap, amongst other inefficiencies), just make the Character from the single unicode scalar value directly. This also speeds up simple iteration of BMP strings when the optimizer is unable to eliminate the subscript. Around 2x for ASCII, and around 20% for BMP UTF16.
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@swift-ci please test and merge |
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Cherry pick of #9252