[Webkit-unassigned] [Bug 117586] New: Optimize String::fromUTF8 for ASCII

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117586

           Summary: Optimize String::fromUTF8 for ASCII
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: gyuyoung.kim at samsung.com


We probably need to consider to merge with https://src.chromium.org/viewvc/blink?view=rev&revision=152243. Current String::fromUTF8() implementation converts 8 bit ASCII character into 16 bit. Instead of always trying to convert into a 16 bit buffer, we can add a call to charactersAreAllASCII. In the common case when characters are ASCII, we directly copy it into an 8 bit string buffer.

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