1 files changed, 32 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/isolate-4.c b/gcc/testsuite/gcc.dg/tree-ssa/isolate-4.c
new file mode 100644
index 00000000000..6937d25580a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/isolate-4.c
@@ -0,0 +1,32 @@
+/* { dg-do compile } */ 
+/* { dg-options "-O2 -fdump-tree-isolate-paths -fdump-tree-phicprop1" } */
+
+
+extern void foo(void *) __attribute__ ((__nonnull__ (1)));
+
+int z;
+
+void
+com (int a)
+{
+    foo (a == 42 ? &z  : (void *) 0);
+}
+
+void
+bar (void)
+{
+  foo ((void *)0);
+}
+
+/* We testing that the path isolation code can take advantage of the
+   returns non-null attribute to isolate a path where NULL flows into
+   a return statement.
+
+   We also verify that after isolation phi-cprop simplifies the
+   return statement so that it returns &z directly.
+/* { dg-final { scan-tree-dump-times "__builtin_trap" 2 "isolate-paths"} } */
+/* { dg-final { scan-tree-dump-times "foo .&z.;" 1 "phicprop1"} } */
+/* { dg-final { cleanup-tree-dump "isolate-paths" } } */
+/* { dg-final { cleanup-tree-dump "phicprop1" } } */
+
+