[Mono-bugs] [Bug 79054][Blo] Changed - Unable to cast a ulong to a IntPtr

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Changed by stephen.gennard at microfocus.com.

http://bugzilla.ximian.com/show_bug.cgi?id=79054

--- shadow/79054	2006-08-11 07:06:11.000000000 -0400
+++ shadow/79054.tmp.1269	2006-08-11 07:51:02.000000000 -0400
@@ -112,6 +112,39 @@
 You could also use (void*) as the intermediate cast.
 
 I would like to know why this works with CSC.EXE, as msdn2 doesn't
 list any IntPtr members that work with the UInt64, so either CSC.EXE
 has an internally-permitted conversion from ulong, or their class
 library has some members which aren't documented.
+
+------- Additional Comments From stephen.gennard at microfocus.com  2006-08-11 07:51 -------
+When using:
+			int   a = 42;
+			IntPtr b = (IntPtr)a;
+			Console.WriteLine(b);
+
+Microsoft generates a "conv.u8" and use the "op_Explicit(int64)", 
+rather than using op_Explicit(int32) directly.
+
+So I think their compiler is indeed allowing the up sizing.
+
+The IL code snippet is:
+
+     IL_0000:  nop
+    IL_0001:  ldc.i4.s   42
+    IL_0003:  stloc.0
+    IL_0004:  ldloc.0
+    IL_0005:  conv.u8
+    IL_0006:  call       native int [mscorlib]
+System.IntPtr::op_Explicit(int64)
+    IL_000b:  stloc.1
+    IL_000c:  ldloc.1
+    IL_000d:  box        [mscorlib]System.IntPtr
+    IL_0012:  call       void [mscorlib]System.Console::WriteLine
+(object)
+    IL_0017:  nop
+    IL_0018:  ldc.i4.0
+    IL_0019:  stloc.2
+    IL_001a:  br.s       IL_001c
+
+    IL_001c:  ldloc.2
+    IL_001d:  ret