[Mono-bugs] [Bug 618176] New: Array CopyTo is slower than .net

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http://bugzilla.novell.com/show_bug.cgi?id=618176

http://bugzilla.novell.com/show_bug.cgi?id=618176#c0


           Summary: Array CopyTo is slower than .net
    Classification: Mono
           Product: Mono: Runtime
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Enhancement
          Priority: P5 - None
         Component: JIT
        AssignedTo: lupus at novell.com
        ReportedBy: msafar at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


For following micro benchmark mono is about 2.5x slower than .net

using System;
using System.Diagnostics;
using System.Collections.Generic;

class Test
{
    public static void Main ()
    {
        IList<Test> src = new Test [4];
        var target = new Test [4];

        var sw = new Stopwatch ();
        sw.Start ();
        for (int i = 0; i < 10000000; ++i)
            src.CopyTo (target, 0);

        sw.Stop ();
        Console.WriteLine (sw.ElapsedMilliseconds);
        Console.WriteLine (target.Length);
    }
}

32-bit system

Mono trunk: 1967
NET v4: 791

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