SmallVector: Don't rely on having an assignment operator around in push_back for POD-like types.

llvm-svn: 155791

2 files changed, 14 insertions, 1 deletions

diff --git a/llvm/include/llvm/ADT/SmallVector.h b/llvm/include/llvm/ADT/SmallVector.h
index 0d9d0d12e86..8b75ff56a3c 100644
--- a/llvm/include/llvm/ADT/SmallVector.h
+++ b/llvm/include/llvm/ADT/SmallVector.h
@@ -252,7 +252,7 @@ public:
   void push_back(const T &Elt) {
     if (this->EndX < this->CapacityX) {
     Retry:
-      *this->end() = Elt;
+      memcpy(this->end(), &Elt, sizeof(T));
       this->setEnd(this->end()+1);
       return;
     }
diff --git a/llvm/unittests/ADT/SmallVectorTest.cpp b/llvm/unittests/ADT/SmallVectorTest.cpp
index d5bfe768003..c2542d614e2 100644
--- a/llvm/unittests/ADT/SmallVectorTest.cpp
+++ b/llvm/unittests/ADT/SmallVectorTest.cpp
@@ -413,4 +413,17 @@ TEST_F(SmallVectorTest, IteratorTest) {
   theVector.insert(theVector.end(), L.begin(), L.end());
 }
 
+struct notassignable {
+  int &x;
+  notassignable(int &x) : x(x) {}
+};
+
+TEST_F(SmallVectorTest, NoAssignTest) {
+  int x = 0;
+  SmallVector<notassignable, 2> vec;
+  vec.push_back(notassignable(x));
+  x = 42;
+  EXPECT_EQ(42, vec.pop_back_val().x);
+}
+
 }