fold-const.c (fold_convert): When casting an expression to void...

	* fold-const.c (fold_convert): When casting an expression to void,
	fold_ignored_result may discover a GIMPLE_MODIFY_STMT which doesn't
	have a type.  Instead of attempting to build a NOP_EXPR, return
	these "special" trees directly.

From-SVN: r120451

gcc/ChangeLog

+2007-01-04  Roger Sayle  <roger@eyesopen.com>
+
+	* fold-const.c (fold_convert): When casting an expression to void,
+	fold_ignored_result may discover a GIMPLE_MODIFY_STMT which doesn't
+	have a type.  Instead of attempting to build a NOP_EXPR, return
+	these "special" trees directly.
+
 2007-01-04  Joseph Myers  <joseph@codesourcery.com>
 
 	* config/rs6000/rs6000.c (rs6000_rtx_costs): Make adjustment for

gcc/fold-const.c

@@ -2144,7 +2144,10 @@ fold_convert (tree type, tree arg)
       return fold_build1 (VIEW_CONVERT_EXPR, type, arg);
 
     case VOID_TYPE:
-      return fold_build1 (NOP_EXPR, type, fold_ignored_result (arg));
+      tem = fold_ignored_result (arg);
+      if (TREE_CODE (tem) == GIMPLE_MODIFY_STMT)
+	return tem;
+      return fold_build1 (NOP_EXPR, type, tem);
 
     default:
       gcc_unreachable ();