re PR middle-end/28131 (FAIL: gcc.c-torture/execute/va-arg-25.c compilation (ICE))

2006-06-22  Roger Sayle  <roger@eyesopen.com>
	    John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>

	PR middle-end/28131
	* expr.c (expand_expr_real_1) <VECTOR_CST>: Check whether the
	call to lang_hooks.types.type_for_mode returned NULL_TREE.


Co-Authored-By: John David Anglin <dave.anglin@nrc-cnrc.gc.ca>

From-SVN: r114923

gcc/ChangeLog

+2006-06-22  Roger Sayle  <roger@eyesopen.com>
+	    John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR middle-end/28131
+	* expr.c (expand_expr_real_1) <VECTOR_CST>: Check whether the
+	call to lang_hooks.types.type_for_mode returned NULL_TREE.
+
 2006-06-23  Ben Elliston  <bje@au.ibm.com>
 
 	* dfp.c (decimal_to_decnumber): Do not use decNumberNegate to

gcc/expr.c

@@ -6945,9 +6945,11 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
 	    || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT)
 	  return const_vector_from_tree (exp);
 	if (GET_MODE_CLASS (mode) == MODE_INT)
-	  tmp = fold_unary (VIEW_CONVERT_EXPR,
-			    lang_hooks.types.type_for_mode (mode, 1),
-			    exp);
+	  {
+	    tree type_for_mode = lang_hooks.types.type_for_mode (mode, 1);
+	    if (type_for_mode)
+	      tmp = fold_unary (VIEW_CONVERT_EXPR, type_for_mode, exp);
+	  }
 	if (!tmp)
 	  tmp = build_constructor_from_list (type,
 					     TREE_VECTOR_CST_ELTS (exp));