re PR tree-optimization/36449 (Incorrect code generated for access to a large struct)

	PR middle-end/36449
	* g++.dg/opt/pr36449.C: New test.

From-SVN: r139859

gcc/testsuite/ChangeLog

+2008-09-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/36449
+	* g++.dg/opt/pr36449.C: New test.
+
 2008-08-31  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c/37271

gcc/testsuite/g++.dg/opt/pr36449.C

+// PR middle-end/36449
+// { dg-do run }
+// { dg-options "-O3" }
+
+extern "C" void exit (int);
+extern "C" void abort ();
+
+struct R
+{
+  short a;
+  short b;
+};
+
+struct S
+{
+  R e;
+  long f;
+  long g;
+};
+
+struct T
+{
+  short c;
+  short d;
+};
+
+struct U
+{
+  long h[0x1ffffff + 1];
+  T i;
+};
+
+U *j;
+
+void __attribute__((noinline))
+bar ()
+{
+  exit (0);
+}
+
+void __attribute__((noinline))
+foo ()
+{
+  S s;
+
+  s.e.a = 36;
+  s.e.b = 38;
+  if (s.e.a == j->i.c && s.e.b == j->i.d)
+    bar ();
+}
+
+int
+main ()
+{
+  try
+    {
+      j = new U;
+    }
+  catch (...)
+    {
+      return 0;
+    }
+  j->i.c = 36;
+  j->i.d = 38;
+  j->h[0] = 1;
+  j->h[1] = 2;
+  j->h[2] = 3;
+  foo ();
+  abort ();
+}