[Mono-bugs] [Bug 54917][Wis] Changed - Avoid emitting redundant null checks on callvirt

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Changed by bmaurer@users.sf.net.

http://bugzilla.ximian.com/show_bug.cgi?id=54917

--- shadow/54917	2004-02-29 20:12:17.000000000 -0500
+++ shadow/54917.tmp.7443	2004-02-29 22:54:38.000000000 -0500
@@ -1,23 +1,23 @@
 Bug#: 54917
-Product: Mono/Compilers
+Product: Mono/Runtime
 Version: unspecified
 OS: unknown
 OS Details: 
 Status: REOPENED   
 Resolution: 
 Severity: Unknown
 Priority: Wishlist
-Component: C#
+Component: misc
 AssignedTo: mono-bugs@ximian.com                            
 ReportedBy: bmaurer@users.sf.net               
 QAContact: mono-bugs@ximian.com
 TargetMilestone: ---
 URL: 
 Cc: 
-Summary: We miss some optimizations with callvirt
+Summary: Avoid emitting redundant null checks on callvirt
 
 Callvirt not only does vtable lookups, but also does checking for null
 values. It is what generates NullReferenceExceptions. However, the checks
 obviously come at a cost. Right now, we do not avoid callvirt in some
 situations when we can.
 
@@ -116,6 +116,9 @@
 to get a good portion of that improvement without regressions. Even a
 1% global increase would be *very* cool.
 
 ------- Additional Comments From lupus@ximian.com  2004-02-29 20:12 -------
 Those kind of more complicated cases should be left to the jit to
 optimize.
+
+------- Additional Comments From bmaurer@users.sf.net  2004-02-29 22:54 -------
+Good point, this is probably better for the JIT.