[Mono-bugs] [Bug 551156] New: String.EndsWith is very slow

[bugzilla_noreply at novell.com]

http://bugzilla.novell.com/show_bug.cgi?id=551156


           Summary: String.EndsWith is very slow
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: CORLIB
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: tedu at fogcreek.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=324748)
 --> (http://bugzilla.novell.com/attachment.cgi?id=324748)
demonstration of slow endswith

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.12)
Gecko/20080207 Ubuntu/7.10 (gutsy) Firefox/2.0.0.12

The mono implementation of String.EndsWith is very slow compared to other
string functions like StartsWith, 10 times slower.

Attached testcase demonstrates the problem when run on Windows and with mono. 
Please note, I'm not talking about the relative performance difference between
MS and mono, just the relative difference in performance for these two
functions on mono.

Reproducible: Always

Steps to Reproduce:
1.
2.
3.
Actual Results:  
testing EndsWith...
done
00:00:09.9103340
testing StartsWith...
done
00:00:01.8466830
testing EndsWith...
done
00:00:09.7243590
testing StartsWith...
done
00:00:01.7808640
testing EndsWith...
done
00:00:09.7318400
testing StartsWith...
done
00:00:01.8223790


Expected Results:  
On Windows:
testing EndsWith...
done
00:00:00.1249992
testing StartsWith...
done
00:00:00.1406241
testing EndsWith...
done
00:00:00.1249992
testing StartsWith...
done
00:00:00.1406241
testing EndsWith...
done
00:00:00.1249992
testing StartsWith...
done
00:00:00.1406241

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