[Webkit-unassigned] [Bug 79903] New: WTF: Micro-optimize cleanup of empty vectors and hash tables

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79903

           Summary: WTF: Micro-optimize cleanup of empty vectors and hash
                    tables
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptGlue
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: wingo at igalia.com
                CC: darin at apple.com, ggaren at apple.com, oliver at apple.com,
                    barraclough at apple.com


The patch to be attached has the following changelog:

        This patch speeds up cleanup of vectors and hash tables whose
        backing store was never allocated.  This is the case by default
        for most vectors / hash tables that never had any entries added.

        The result for me is that calling checkSyntax 1000 times on
        concat-jquery-mootools-prototype.js goes from 6.234s to 6.068s, a
        2.4% speedup.

        * wtf/HashTable.h:
        (WTF::HashTable::~HashTable):
        (WTF::::clear): Don't deallocate the storage or frob member
        variables if there is no backing storage.
        * wtf/Vector.h:
        (WTF::VectorBufferBase::deallocateBuffer): Likewise.

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