src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp

@@ -129,24 +129,24 @@
   }
 }
 
 inline oop ShenandoahHeap::cas_oop(oop n, oop* addr, oop c) {
   assert(is_aligned(addr, HeapWordSize), "Address should be aligned: " PTR_FORMAT, p2i(addr));
-  return (oop) Atomic::cmpxchg(n, addr, c);
+  return (oop) Atomic::cmpxchg(addr, c, n);
 }
 
 inline oop ShenandoahHeap::cas_oop(oop n, narrowOop* addr, narrowOop c) {
   assert(is_aligned(addr, sizeof(narrowOop)), "Address should be aligned: " PTR_FORMAT, p2i(addr));
   narrowOop val = CompressedOops::encode(n);
-  return CompressedOops::decode((narrowOop) Atomic::cmpxchg(val, addr, c));
+  return CompressedOops::decode((narrowOop) Atomic::cmpxchg(addr, c, val));
 }
 
 inline oop ShenandoahHeap::cas_oop(oop n, narrowOop* addr, oop c) {
   assert(is_aligned(addr, sizeof(narrowOop)), "Address should be aligned: " PTR_FORMAT, p2i(addr));
   narrowOop cmp = CompressedOops::encode(c);
   narrowOop val = CompressedOops::encode(n);
-  return CompressedOops::decode((narrowOop) Atomic::cmpxchg(val, addr, cmp));
+  return CompressedOops::decode((narrowOop) Atomic::cmpxchg(addr, cmp, val));
 }
 
 template <class T>
 inline oop ShenandoahHeap::maybe_update_with_forwarded_not_null(T* p, oop heap_oop) {
   shenandoah_assert_not_in_cset_loc_except(p, !is_in(p) || is_full_gc_in_progress() || is_degenerated_gc_in_progress());