new testcase for PR1421

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37356 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CFrontend/2007-05-29-UnionCopy.c b/test/CFrontend/2007-05-29-UnionCopy.c
new file mode 100644 (file)
index 0000000..ded67d4
--- /dev/null
+++ b/test/CFrontend/2007-05-29-UnionCopy.c
@@ -0,0 +1,18 @@
+// RUN: %llvmgcc -S -o - -emit-llvm %s | grep memcpy
+// PR1421
+
+struct A {
+  char c;
+  int i;
+};
+
+struct B {
+  int c;
+  unsigned char x;
+};
+
+union U { struct A a; struct B b; };
+
+void check(union U *u, union U *v) {
+  *u = *v;
+}