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diff --git a/unittests/ADT/APInt.cpp b/unittests/ADT/APInt.cpp
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+++ b/unittests/ADT/APInt.cpp
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+//===- llvm/unittest/ADT/APInt.cpp - APInt unit tests -----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/ADT/APInt.h"
+
+using namespace llvm;
+
+namespace {
+
+// Test that APInt shift left works when bitwidth > 64 and shiftamt == 0
+TEST(APIntTest, ShiftLeftByZero) {
+  APInt One = APInt::getNullValue(65) + 1;
+  APInt Shl = One.shl(0);
+  EXPECT_EQ(Shl[0], true);
+  EXPECT_EQ(Shl[1], false);
+}
+
+}