1 files changed, 49 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-15.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-15.c
new file mode 100644
index 000000000..aaf57126a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-15.c
@@ -0,0 +1,49 @@
+/* { dg-do compile } */ 
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+/* Check that the initial values are honored when necessary.  */
+
+void link_error (void);
+
+/* The call to link_error cannot be eliminated in this case.  */
+
+void test1 (int param1, int param2, int x)
+{
+  if (param1)
+    x = 3;
+
+  if (param2)
+    if (x != 3)
+      link_error ();
+}
+
+/* The call to link_error cannot be eliminated in this case.  */
+
+int global;
+void test2 (int param1, int param2)
+{
+  if (param1)
+    global = 3;
+
+  if (param2)
+    if (global != 3)
+      link_error ();
+}
+
+/* In this case, we can eliminate the call, as unless "local" is set
+   to 3, its value is undefined.  */
+
+void test3 (int param1, int param2)
+{
+  int local;
+
+  if (param1)
+    local = 3;
+
+  if (param2)
+    if (local != 3)
+      link_error ();
+}
+
+/* { dg-final { scan-tree-dump-times "link_error" 2 "optimized" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */