re PR c++/27826 (ICE in copy_to_mode_reg)

2007-01-05  Richard Guenther  <rguenther@suse.de>

	PR middle-end/27826
	* tree.c (get_narrower): Do not construct COMPONENT_REFs
	with mismatched types.  Instead explicitly build a
	conversion NOP_EXPR.

	* g++.dg/opt/pr27826.C: New testcase.

From-SVN: r120498

gcc/ChangeLog

+2007-01-05  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/27826
+	* tree.c (get_narrower): Do not construct COMPONENT_REFs
+	with mismatched types.  Instead explicitly build a
+	conversion NOP_EXPR.
+
 2007-01-05  Ian Lance Taylor  <iant@google.com>
 
 	* c-common.c (decl_with_nonnull_addr_p): New function.

gcc/testsuite/ChangeLog

+2007-01-05  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/27826
+	* g++.dg/opt/pr27826.C: New testcase.
+
 2007-01-05  Ian Lance Taylor  <iant@google.com>
 
 	* gcc.dg/Walways-true-1.c: New test.

gcc/testsuite/g++.dg/opt/pr27826.C

+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+struct Geometry
+{
+        int type:16;
+};
+struct Geometry get() {};
+int f()
+{
+        struct Geometry test;
+        return get().type == test.type;
+}
+

gcc/tree.c

@@ -5989,12 +5989,10 @@ get_narrower (tree op, int *unsignedp_ptr)
 	{
 	  if (first)
 	    uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
-	  win = build3 (COMPONENT_REF, type, TREE_OPERAND (op, 0),
-			TREE_OPERAND (op, 1), NULL_TREE);
-	  TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
-	  TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
+	  win = fold_convert (type, op);
 	}
     }
+
   *unsignedp_ptr = uns;
   return win;
 }