272 function SparseSlice(array, start_i, del_count, len, deleted_elements) {  argument
274   var indices = %GetArrayKeys(array, start_i + del_count);
302 function SparseMove(array, start_i, del_count, len, num_additional_args) {  argument
304   if (num_additional_args === del_count) return;
308       MinSimple(len - del_count + num_additional_args, 0xffffffff));
319     for (var i = start_i + del_count; i < limit; ++i) {
322         new_array[i - del_count + num_additional_args] = current;
335         } else if (key >= start_i + del_count) {
338             var new_key = key - del_count + num_additional_args;
365 function SimpleSlice(array, start_i, del_count, len, deleted_elements) {  argument
367   for (var i = 0; i < del_count; i++) {
377 function SimpleMove(array, start_i, del_count, len, num_additional_args) {  argument
379   if (num_additional_args !== del_count) {
382     if (num_additional_args > del_count) {
383       for (var i = len - del_count; i > start_i; i--) {
384         var from_index = i + del_count - 1;
393       for (var i = start_i; i < len - del_count; i++) {
394         var from_index = i + del_count;
402       for (var i = len; i > len - del_count + num_additional_args; i--) {
820   var del_count = 0;
824   del_count = TO_INTEGER(delete_count);
825   if (del_count < 0)
828   if (del_count > len - start_i)
831   return del_count;
839   var del_count = ComputeSpliceDeleteCount(delete_count, num_arguments, len,
842   deleted_elements.length = del_count;
848     SimpleSlice(this, start_i, del_count, len, deleted_elements);
849     SimpleMove(this, start_i, del_count, len, num_elements_to_add);
859     this.length = len - del_count + num_elements_to_add;
886   var del_count = ComputeSpliceDeleteCount(delete_count, num_arguments, len,
888   var deleted_elements = ArraySpeciesCreate(array, del_count);
889   deleted_elements.length = del_count;
892   if (del_count != num_elements_to_add && %object_is_sealed(array)) {
894   } else if (del_count > 0 && %object_is_frozen(array)) {
898   var changed_elements = del_count;
899   if (num_elements_to_add != del_count) {
902     changed_elements += len - start_i - del_count;
907     SparseSlice(array, start_i, del_count, len, deleted_elements);
908     SparseMove(array, start_i, del_count, len, num_elements_to_add);
910     SimpleSlice(array, start_i, del_count, len, deleted_elements);
911     SimpleMove(array, start_i, del_count, len, num_elements_to_add);
922   array.length = len - del_count + num_elements_to_add;