re PR tree-optimization/30590 (tree-nrv optimization clobbers return variable)

2007-03-19  Seongbae Park <seongbae.park@gmail.com>

	PR tree-optimization/30590
	* g++.dg/opt/pr30590.C: New testcase.

From-SVN: r123087

gcc/testsuite/ChangeLog

+2007-03-19  Seongbae Park <seongbae.park@gmail.com>
+
+	PR tree-optimization/30590
+	* g++.dg/opt/pr30590.C: New testcase.
+
 2007-03-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/30762

gcc/testsuite/g++.dg/opt/pr30590.C

+/* { dg-do run } */
+/* { dg-options "-O" } */
+struct test
+{
+  int type;
+  char buffer[4242]; /* should trigger pass-by-reference */
+};
+
+int flag = 0;
+
+struct test
+reset (void)
+{
+  struct test retval;
+  retval.type = 1;
+  return retval;
+}
+
+struct test
+test (void)
+{
+  struct test result;
+  result.type = 0;
+
+  for (int i = 0; i < 2; ++i)
+    {
+      struct test candidate = reset ();
+      if (flag)
+        result = candidate;
+    }
+
+  return result;
+}
+
+int
+main (void)
+{
+  struct test result = test ();
+  return result.type;
+}