expr.c (store_expr): Use emit_block_move only if both source and target are MEMs.

2010-08-05  Richard Guenther  <rguenther@suse.de>

	* expr.c (store_expr): Use emit_block_move only if both
	source and target are MEMs.  Use store_bit_field if only
	the target is a MEM.

From-SVN: r162918

gcc/ChangeLog

+2010-08-05  Richard Guenther  <rguenther@suse.de>
+
+	* expr.c (store_expr): Use emit_block_move only if both
+	source and target are MEMs.  Use store_bit_field if only
+	the target is a MEM.
+
 2010-08-05  Richard Henderson  <rth@redhat.com>
 
 	PR 45189

gcc/expr.c

@@ -4752,11 +4752,14 @@ store_expr (tree exp, rtx target, int call_param_p, bool nontemporal)
 	{
 	  int unsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
 	  if (GET_MODE (target) == BLKmode
-		   || GET_MODE (temp) == BLKmode)
+	      && GET_MODE (temp) == BLKmode)
 	    emit_block_move (target, temp, expr_size (exp),
 			     (call_param_p
 			      ? BLOCK_OP_CALL_PARM
 			      : BLOCK_OP_NORMAL));
+	  else if (GET_MODE (target) == BLKmode)
+	    store_bit_field (target, INTVAL (expr_size (exp)) * BITS_PER_UNIT,
+			     0, GET_MODE (temp), temp);
 	  else
 	    convert_move (target, temp, unsignedp);
 	}