1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-10.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-10.c
new file mode 100644
index 000000000..7177d991e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-10.c
@@ -0,0 +1,34 @@
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-fab" } */
+
+/* Check that we fold strlen of equally long strings, and that we do not
+   fail to terminate when there is a nontrivial cycle in the corresponding
+   ssa graph.  */
+
+extern __SIZE_TYPE__ strlen (const char *);
+
+void foo(int i)
+{
+  char *s = "abcde";
+
+  if (i)
+    {
+      s = "defgh";
+      goto middle;
+    }
+
+start:
+
+  bla ();
+
+middle:
+
+  if (bla ())
+    goto start;
+
+  bar (strlen (s));
+}
+
+/* There should be no calls to strlen.  */
+/* { dg-final { scan-tree-dump-times "strlen" 0 "fab"} } */
+/* { dg-final { cleanup-tree-dump "fab" } } */