gimple.c (maybe_fold_reference): Verify that operand is gimple_min_invariant.

	* gimple.c (maybe_fold_reference): Verify that operand is
	gimple_min_invariant.
	* gcc.c-torture/compile/20100907.c: New testcase.

From-SVN: r163948

gcc/ChangeLog

+2010-09-07  Jan Hubicka  <jh@suse.cz>
+
+	* gimple.c (maybe_fold_reference): Verify that operand is
+	gimple_min_invariant.
+
 2010-09-07  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/45569

gcc/gimple-fold.c

@@ -477,7 +477,8 @@ maybe_fold_reference (tree expr, bool is_lhs)
   tree result;
 
   if (!is_lhs
-      && (result = fold_const_aggregate_ref (expr)))
+      && (result = fold_const_aggregate_ref (expr))
+      && is_gimple_min_invariant (result))
     return result;
 
   /* ???  We might want to open-code the relevant remaining cases

gcc/testsuite/ChangeLog

+2010-09-07  Jan Hubicka  <jh@suse.cz>
+
+	* gcc.c-torture/compile/20100907.c: New testcase.
+
 2010-09-07  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/45569

gcc/testsuite/gcc.c-torture/compile/20100907.c

+struct a {int a,b;};
+const static struct a a[1]={{1,2}};
+struct a b,c;
+t()
+{
+  int idx = 0;
+  b=a[idx];
+  c=a[idx];
+}