(expand_expr...

(expand_expr, case CONSTRUCTOR): If constant and large enough for
memcpy to be used, build constructor into static memory.

From-SVN: r7365

diff --git a/gcc/expr.c b/gcc/expr.c
index 9910a5a59c73de13032683023790a210a988bf6e..9c5f0a4229f3d9a9809c3cfdf0c263625b50bd98 100644 (file)
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -4102,12 +4102,18 @@ expand_expr (exp, target, tmode, modifier)
         if this is a non-BLKmode mode, let it store a field at a time
         since that should make a CONST_INT or CONST_DOUBLE when we
         fold.  Likewise, if we have a target we can use, it is best to
-        store directly into the target.  If we are making an initializer and
+        store directly into the target unless the type is large enough
+        that memcpy will be used.  If we are making an initializer and
         all operands are constant, put it in memory as well.  */
       else if ((TREE_STATIC (exp)
                && ((mode == BLKmode
                     && ! (target != 0 && safe_from_p (target, exp)))
-                   || TREE_ADDRESSABLE (exp)))
+                   || TREE_ADDRESSABLE (exp)
+                   || (TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
+                       && (move_by_pieces_ninsns
+                           (TREE_INT_CST_LOW (TYPE_SIZE (type)),
+                            TYPE_ALIGN (type))
+                           > MOVE_RATIO))))
               || (modifier == EXPAND_INITIALIZER && TREE_CONSTANT (exp)))
        {
          rtx constructor = output_constant_def (exp);