tree.c (unsave_expr_1): Don't mess with a TARGET_EXPR that hasn't been expanded.

        * tree.c (unsave_expr_1): Don't mess with a TARGET_EXPR that hasn't
        been expanded.

From-SVN: r32814

gcc/ChangeLog

+2000-03-29  Jason Merrill  <jason@casey.cygnus.com>
+
+	* tree.c (unsave_expr_1): Don't mess with a TARGET_EXPR that hasn't
+	been expanded.
+
 Wed Mar 29 15:39:10 2000  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
 	* stor-layout.c (bit_from_pos, byte_from_pos): New functions.

gcc/tree.c

@@ -2605,6 +2605,13 @@ unsave_expr_1 (expr)
       break;
 
     case TARGET_EXPR:
+      /* Don't mess with a TARGET_EXPR that hasn't been expanded.
+         It's OK for this to happen if it was part of a subtree that
+         isn't immediately expanded, such as operand 2 of another
+         TARGET_EXPR.  */
+      if (TREE_OPERAND (expr, 1))
+	break;
+
       TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
       TREE_OPERAND (expr, 3) = NULL_TREE;
       break;