src/hotspot/share/gc/parallel/psParallelCompact.cpp

@@ -530,11 +530,11 @@
   const size_t obj_ofs = pointer_delta(addr, _region_start);
   const size_t beg_region = obj_ofs >> Log2RegionSize;
   const size_t end_region = (obj_ofs + len - 1) >> Log2RegionSize;
 
   DEBUG_ONLY(Atomic::inc(&add_obj_count);)
-  DEBUG_ONLY(Atomic::add(len, &add_obj_size);)
+  DEBUG_ONLY(Atomic::add(&add_obj_size, len);)
 
   if (beg_region == end_region) {
     // All in one region.
     _region_data[beg_region].add_live_obj(len);
     return;

@@ -2447,11 +2447,11 @@
     assert(_insert_index < _size, "too small backing array");
     _backing_array[_insert_index++] = value;
   }
 
   bool try_claim(PSParallelCompact::UpdateDensePrefixTask& reference) {
-    uint claimed = Atomic::add(1u, &_counter) - 1; // -1 is so that we start with zero
+    uint claimed = Atomic::add(&_counter, 1u) - 1; // -1 is so that we start with zero
     if (claimed < _insert_index) {
       reference = _backing_array[claimed];
       return true;
     } else {
       return false;