Adding a test for ChangeToTargetIndex

[kariddi]

Summary

Adding a unittest for this method as no backend is using it right now.

[davide]

LGTM, thanks.
Ciao!

llvm/trunk/unittests/CodeGen/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
   AsmPrinter
   CodeGen
   Core
   Support
   )
 
 set(CodeGenSources
   DIEHashTest.cpp
   LowLevelTypeTest.cpp
   MachineInstrBundleIteratorTest.cpp
+  MachineOperandTest.cpp
   ScalableVectorMVTsTest.cpp
   )
 
 add_llvm_unittest(CodeGenTests
   ${CodeGenSources}
   )
 
 add_subdirectory(GlobalISel)

llvm/trunk/unittests/CodeGen/MachineOperandTest.cpp

+//===- MachineOperandTest.cpp ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+
+TEST(MachineOperandTest, ChangeToTargetIndexTest) {
+  // Creating a MachineOperand to change it to TargetIndex
+  MachineOperand MO = MachineOperand::CreateImm(50);
+
+  // Checking some precondition on the newly created
+  // MachineOperand.
+  ASSERT_TRUE(MO.isImm());
+  ASSERT_TRUE(MO.getImm() == 50);
+  ASSERT_FALSE(MO.isTargetIndex());
+
+  // Changing to TargetIndex with some arbitrary values
+  // for index, offset and flags.
+  MO.ChangeToTargetIndex(74, 57, 12);
+
+  // Checking that the mutation to TargetIndex happened
+  // correctly.
+  ASSERT_TRUE(MO.isTargetIndex());
+  ASSERT_TRUE(MO.getIndex() == 74);
+  ASSERT_TRUE(MO.getOffset() == 57);
+  ASSERT_TRUE(MO.getTargetFlags() == 12);
+}
+
+} // end namespace