diff --git a/test/FrontendC/union-align.c b/test/FrontendC/union-align.c
new file mode 100644
index 00000000000..f99a7608056
--- /dev/null
+++ b/test/FrontendC/union-align.c
@@ -0,0 +1,17 @@
+// RUN: %llvmgcc -S %s -o - | grep load | grep "4 x float" | not grep "align 4"
+// RUN: %llvmgcc -S %s -o - | grep load | grep "4 x float" | grep "align 16"
+// PR3432
+// rdar://6536377
+
+typedef float __m128 __attribute__ ((__vector_size__ (16)));
+
+typedef union
+{
+  int i[4];
+  float f[4];
+  __m128 v;
+} u_t;
+
+__m128 t(u_t *a) {
+  return a->v;
+}