[Webkit-unassigned] [Bug 97794] New: IndexedDB: Optimize encodeString/decodeString

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97794

           Summary: IndexedDB: Optimize encodeString/decodeString
           Product: WebKit
           Version: 523.x (Safari 3)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jsbell at chromium.org
                CC: dgrogan at chromium.org, alecflett at chromium.org


CPU profiling shows that string encoding/decoding is a hot spot for IDB.

* The backing store encodes strings in UTF-16BE. Most CPUs these days are little-endian, which means byte swapping
* The byte swapping for decode is done into a StringBuilder with append() calls, which have overhead.

Short term, this could be optimized by bypassing StringBuilder and walking memory short by short doing using htons/ntohs c/o arpa/inet.h

Long term it would make sense to switch the backing store encoding to UTF-16LE to save work on most architectures.

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.