re PR tree-optimization/13761 ([tree-ssa] component refs to the same struct should not alias)

2008-03-14  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/13761
	* gcc.dg/tree-ssa/ssa-lim-3.c: New testcase.

From-SVN: r133224

gcc/testsuite/ChangeLog

 2008-03-14  Richard Guenther  <rguenther@suse.de>
 
+	PR tree-optimization/13761
+	* gcc.dg/tree-ssa/ssa-lim-3.c: New testcase.
+
+2008-03-14  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/34172
 	* gcc.dg/tree-ssa/ssa-fre-11.c: New testcase.
 	* gcc.dg/tree-ssa/ssa-fre-12.c: Likewise.

gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-3.c

+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-lim-details -fdump-tree-optimized" } */
+
+struct { int x; int y; } global;
+void foo(int n)
+{
+  int i;
+  for ( i=0; i<n; i++)
+    global.y += global.x*global.x;
+}
+
+/* { dg-final { scan-tree-dump "Executing store motion of global.y" "lim" } } */
+/* { dg-final { scan-tree-dump "Moving statement.*global.x.*out of loop 1" "lim" } } */
+/* { dg-final { cleanup-tree-dump "lim" } } */