[Mono-bugs] [Bug 413247] New: [perf regression] slowdown with linear IR

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Jul 30 10:33:07 EDT 2008


https://bugzilla.novell.com/show_bug.cgi?id=413247


           Summary: [perf regression] slowdown with linear IR
           Product: Mono: Runtime
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: JIT
        AssignedTo: vargaz at gmail.com
        ReportedBy: lupus at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


The following bench is 3-4 times slower on x86 after the switch to the linear
IR.
using System;

class Program {
    public static void Main() {
      double d = 0;
      for (double i = 0; i < 100000000; i++) {
        d += i + 1000.0;
        d += i - 1000.0;
        d += i * 1000.0;
        d += i / 1000.0;
        d += i % 1000.0;
      }
      Console.WriteLine (d);
   }
}


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