[Mono-bugs] [Bug 55979][Wis] New - We can avoid a local variable in foreach

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Changed by bmaurer@users.sf.net.

http://bugzilla.ximian.com/show_bug.cgi?id=55979

--- shadow/55979	2004-03-23 18:52:36.000000000 -0500
+++ shadow/55979.tmp.19935	2004-03-23 18:52:36.000000000 -0500
@@ -0,0 +1,49 @@
+Bug#: 55979
+Product: Mono: Compilers
+Version: unspecified
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Wishlist
+Component: C#
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: bmaurer@users.sf.net               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Summary: We can avoid a local variable in foreach
+
+The attached patch changes us from using code like:
+
+          IL_002e:  ldloc.2
+          IL_002f:  isinst [mscorlib]System.IDisposable
+          IL_0034:  stloc.3
+          IL_0035:  ldloc.3
+          IL_0036:  brfalse IL_0041
+ 
+          IL_003b:  ldloc.3
+          IL_003c:  callvirt instance void class
+[mscorlib]'System.IDisposable'::'Dispose'()
+          IL_0041:  endfinally
+
+in the finally section of a foreach loop to using:
+
+          IL_002e:  ldloc.2
+          IL_002f:  isinst [mscorlib]System.IDisposable
+          IL_0034:  dup
+          IL_0035:  brtrue.s IL_0039
+ 
+          IL_0037:  pop
+          IL_0038:  endfinally
+          IL_0039:  callvirt instance void class
+[mscorlib]'System.IDisposable'::'Dispose'()
+          IL_003e:  endfinally
+
+Not only is this IL code itself smaller, but it also avoids a local variable.
+
+I ran all the mcs tests, and as well ran peverify on mcs2.exe (from btest),
+and it passed.
+
+Martin, I would love your review again :-).