[Mono-bugs] [Bug 81981][Nor] New - [PERF] Up to 4x slower unsafe code

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Changed by marek.safar at seznam.cz.

http://bugzilla.ximian.com/show_bug.cgi?id=81981

--- shadow/81981	2007-06-30 06:44:49.000000000 -0400
+++ shadow/81981.tmp.15711	2007-06-30 06:44:49.000000000 -0400
@@ -0,0 +1,119 @@
+Bug#: 81981
+Product: Mono: Runtime
+Version: 1.2
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: JIT
+AssignedTo: lupus at ximian.com                            
+ReportedBy: marek.safar at seznam.cz               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: [PERF] Up to 4x slower unsafe code
+
+Please fill in this template when reporting a bug, unless you know what you
+are doing.
+Description of Problem:
+
+
+Steps to reproduce the problem:
+1. 
+
+using System;
+
+
+
+class C
+
+{
+
+	public static void Main()
+
+	{
+
+		Test_Orig ();
+
+	}
+	
+
+	public static unsafe void Test_Orig()
+
+	{
+
+		byte[] a = new byte[10000];
+
+		
+
+		long start = Environment.TickCount;
+
+		byte red, green, blue;
+
+		fixed (byte* fixed_array = &a[0])
+
+		{
+
+			for (int runs = 0; runs < 100000; runs++)
+
+			{
+
+				byte* pointer = fixed_array;
+
+				byte* end = fixed_array + 999;
+
+
+
+ 	               while (pointer < end)
+
+ 	               {
+
+	                    blue = pointer[0];
+
+        	            green = pointer[1];
+
+        	            red = pointer[2];
+
+	                    pointer[0] = pointer[1] = pointer[2] = (byte)(red *
+0.3 + green * 0.59 + blue * 0.11);
+
+	                    pointer += 3;
+
+	                }
+
+	            } 
+
+		}
+
+		
+
+		long end_c = Environment.TickCount - start;
+
+		Console.WriteLine ("End Orig = " + end_c);
+
+	}
+
+}
+
+Actual Results:
+
+Compiled by mcs
+
+Mono: 657
+MS: 297
+
+Compiled by csc
+
+Mono: 960
+MS: 250
+
+Expected Results:
+
+Similar performance
+
+Additional Information:
+
+I am wondering whether I should change mcs to produce different code too.