1 files changed, 33 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/tailcall-6.c b/gcc/testsuite/gcc.dg/tree-ssa/tailcall-6.c
new file mode 100644
index 000000000..4997f9b83
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/tailcall-6.c
@@ -0,0 +1,33 @@
+/* PR tree-optimization/43904.  */
+/* { dg-do run } */
+/* { dg-options "-O1 -foptimize-sibling-calls" } */
+
+typedef __SIZE_TYPE__ size_t;
+extern void abort(void);
+
+void *memcpy(void *dest, const void *src, size_t n);
+
+void
+buggy_init(void *ptr, size_t size)
+{
+  const char *str = "Hello world!";
+  memcpy(ptr, &str, size);
+}
+
+void
+expose_bug(void *ptr, size_t size)
+{
+  const char *str;
+  memcpy(&str, ptr, size);
+  if (*str != 'H')
+    abort ();
+}
+
+int
+main()
+{
+  const char *ptr;
+  buggy_init(&ptr, sizeof(ptr));
+  expose_bug(&ptr, sizeof(ptr));
+  return 0;
+}