re PR middle-end/32964 (union cause inefficient code inside loops)

2009-08-06  Martin Jambor  <mjambor@suse.cz>

	PR middle-end/32964
	* testsuite/gcc.dg/tree-ssa/pr32964.c: New test.

From-SVN: r150523

gcc/testsuite/ChangeLog

+2009-08-06  Martin Jambor  <mjambor@suse.cz>
+
+	PR middle-end/32964
+	* gcc.dg/tree-ssa/pr32964.c: New test.
+
 2009-08-06  Uros Bizjak  <ubizjak@gmail.com>
 	    H.J. Lu  <hongjiu.lu@intel.com>
 

gcc/testsuite/gcc.dg/tree-ssa/pr32964.c

+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-optimized" } */
+
+union A
+{
+ float a;
+};
+
+float t(float a)
+{
+  union A a1, a2, a3;
+  int i;
+
+  a1.a = a;
+  for(i = 0; i<100; i++)
+    {
+      a2 = a1;
+      a2.a += a;
+      a1 = a2;
+  }
+  a3 = a1;
+  return a3.a;
+}
+
+/* { dg-final { scan-tree-dump-times "union" 0 "optimized"} } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */