Add TODO list for MSIL backend

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35244 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/MSIL/README.TXT

@@ -0,0 +1,51 @@
+//===---------------------------------------------------------------------===// 
+
+Vector instructions support.
+
+ShuffleVector
+ExtractElement
+InsertElement
+
+//===---------------------------------------------------------------------===// 
+
+Add "OpaqueType" type.
+
+//===---------------------------------------------------------------------===// 
+
+Variable argument functions support, "VAArg" instruction and some intrinsics.
+CLI instruction "arglist" can get argument list descriptor for current function
+that can be passed to other functions.
+
+ va_arg = Function "System.ArgIterator::GetNextArg()"
+ va_list = Class "System.ArgIterator"
+ va_start = Instruction "arglist"
+ va_end = Do nothing
+
+//===---------------------------------------------------------------------===// 
+
+If possible get used types inside of "MSILWriter" class, do not pass trougth
+"MSILModule" class.
+
+	getAnalysis<FindUsedTypes>().getTypes()
+
+//===---------------------------------------------------------------------===// 
+
+"switch" instruction emulation with CLI "switch" instruction.
+
+//===---------------------------------------------------------------------===// 
+
+Write linker for external function, because function export need to know 
+dynamic library where function located.
+
+.method static hidebysig pinvokeimpl("msvcrt.dll" cdecl)
+	void free(void*) preservesig {}
+
+//===---------------------------------------------------------------------===// 
+
+DLLImport'ed variables support with the help of win32 envoronment.
+
+	"LoadLibrary" - to load dynamic library into address space.
+	"GetProcAddress" - to recive variable address by name.
+
+
+