tree-optimization/108855 - new testcase

New testcase for the fixed bug.

	PR tree-optimization/108855
	* gcc.dg/pr108855.c: New testcase.

diff --git a/gcc/testsuite/gcc.dg/pr108855.c b/gcc/testsuite/gcc.dg/pr108855.c
new file mode 100644 (file)
index 0000000..f79638f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr108855.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+int m;
+
+int
+undefined (int);
+
+__attribute__ ((pure, returns_twice)) int
+bar (void)
+{
+  m = 1;
+  while (m)
+    m = 2;
+
+  return m;
+}
+
+int
+foo (void)
+{
+  return undefined (bar ());
+}