gimplify.c (gimplify_init_constructor): Do not create a temporary for a volatile LHS if...

	* gimplify.c (gimplify_init_constructor): Do not create a temporary for
	a volatile LHS if the constructor has only one element.

From-SVN: r163727

gcc/ChangeLog

+2010-09-01  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gimplify.c (gimplify_init_constructor): Do not create a temporary for
+	a volatile LHS if the constructor has only one element.
+
 2010-09-01  Mikael Pettersson  <mikpe@it.uu.se>
 
 	PR bootstrap/45321

gcc/gimplify.c

@@ -3824,11 +3824,12 @@ gimplify_init_constructor (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 	      }
 	  }
 
-	/* If the target is volatile and we have non-zero elements
-	   initialize the target from a temporary.  */
+	/* If the target is volatile, we have non-zero elements and more than
+	   one field to assign, initialize the target from a temporary.  */
 	if (TREE_THIS_VOLATILE (object)
 	    && !TREE_ADDRESSABLE (type)
-	    && num_nonzero_elements > 0)
+	    && num_nonzero_elements > 0
+	    && VEC_length (constructor_elt, elts) > 1)
 	  {
 	    tree temp = create_tmp_var (TYPE_MAIN_VARIANT (type), NULL);
 	    TREE_OPERAND (*expr_p, 0) = temp;