src/hotspot/share/gc/shared/space.cpp

*** 629,639 ****
  inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size) {
    do {
      HeapWord* obj = top();
      if (pointer_delta(end(), obj) >= size) {
        HeapWord* new_top = obj + size;
!       HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj);
        // result can be one of two:
        //  the old top value: the exchange succeeded
        //  otherwise: the new value of the top is returned.
        if (result == obj) {
          assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");
--- 629,639 ----
  inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size) {
    do {
      HeapWord* obj = top();
      if (pointer_delta(end(), obj) >= size) {
        HeapWord* new_top = obj + size;
!       HeapWord* result = Atomic::cmpxchg(new_top, top_addr(), obj);
        // result can be one of two:
        //  the old top value: the exchange succeeded
        //  otherwise: the new value of the top is returned.
        if (result == obj) {
          assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");