1 files changed, 7 insertions, 0 deletions
diff --git a/unittests/IR/InstructionsTest.cpp b/unittests/IR/InstructionsTest.cpp
index 7c75aaec1753..b8d398c5cc38 100644
--- a/unittests/IR/InstructionsTest.cpp
+++ b/unittests/IR/InstructionsTest.cpp
@@ -21,6 +21,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/IR/NoFolder.h"
 #include "llvm/IR/Operator.h"
+#include "gmock/gmock-matchers.h"
 #include "gtest/gtest.h"
 #include <memory>
 
@@ -740,5 +741,11 @@ TEST(InstructionsTest, SwitchInst) {
   EXPECT_EQ(BB1.get(), Handle.getCaseSuccessor());
 }
 
+TEST(InstructionsTest, CommuteShuffleMask) {
+  SmallVector<int, 16> Indices({-1, 0, 7});
+  ShuffleVectorInst::commuteShuffleMask(Indices, 4);
+  EXPECT_THAT(Indices, testing::ContainerEq(ArrayRef<int>({-1, 4, 3})));
+}
+
 } // end anonymous namespace
 } // end namespace llvm