206 function SmartSlice(array, start_i, del_count, len, deleted_elements) {  argument
208   var indices = %GetArrayKeys(array, start_i + del_count);
236 function SmartMove(array, start_i, del_count, len, num_additional_args) {  argument
238   var new_array = new InternalArray(len - del_count + num_additional_args);
248     for (var i = start_i + del_count; i < limit; ++i) {
251         new_array[i - del_count + num_additional_args] = current;
264         } else if (key >= start_i + del_count) {
267             new_array[key - del_count + num_additional_args] = current;
281 function SimpleSlice(array, start_i, del_count, len, deleted_elements) {  argument
282   for (var i = 0; i < del_count; i++) {
295 function SimpleMove(array, start_i, del_count, len, num_additional_args) {  argument
296   if (num_additional_args !== del_count) {
299     if (num_additional_args > del_count) {
300       for (var i = len - del_count; i > start_i; i--) {
301         var from_index = i + del_count - 1;
314       for (var i = start_i; i < len - del_count; i++) {
315         var from_index = i + del_count;
327       for (var i = len; i > len - del_count + num_additional_args; i--) {
715   var del_count = 0;
719   del_count = TO_INTEGER(delete_count);
720   if (del_count < 0)
723   if (del_count > len - start_i)
726   return del_count;
734   var del_count = ComputeSpliceDeleteCount(delete_count, num_arguments, len,
737   deleted_elements.length = del_count;
743     SimpleSlice(this, start_i, del_count, len, deleted_elements);
744     SimpleMove(this, start_i, del_count, len, num_elements_to_add);
754     this.length = len - del_count + num_elements_to_add;
781   var del_count = ComputeSpliceDeleteCount(delete_count, num_arguments, len,
784   deleted_elements.length = del_count;
787   if (del_count != num_elements_to_add && ObjectIsSealed(array)) {
790   } else if (del_count > 0 && ObjectIsFrozen(array)) {
795   var changed_elements = del_count;
796   if (num_elements_to_add != del_count) {
799     changed_elements += len - start_i - del_count;
804     SmartSlice(array, start_i, del_count, len, deleted_elements);
805     SmartMove(array, start_i, del_count, len, num_elements_to_add);
807     SimpleSlice(array, start_i, del_count, len, deleted_elements);
808     SimpleMove(array, start_i, del_count, len, num_elements_to_add);
819   array.length = len - del_count + num_elements_to_add;