src/hotspot/os_cpu/aix_ppc/atomic_aix_ppc.hpp

@@ -28,10 +28,11 @@
 
 #ifndef PPC64
 #error "Atomic currently only implemented for PPC64"
 #endif
 
+#include "orderAccess_aix_ppc.hpp"
 #include "utilities/debug.hpp"
 
 // Implementation of class atomic
 
 //

@@ -397,6 +398,17 @@
   post_membar(order);
 
   return old_value;
 }
 
+template<size_t byte_size>
+struct Atomic::PlatformOrderedLoad<byte_size, X_ACQUIRE> {
+  template <typename T>
+  T operator()(const volatile T* p) const {
+    T t = Atomic::load(p);
+        // Use twi-isync for load_acquire (faster than lwsync).
+    __asm__ __volatile__ ("twi 0,%0,0\n isync\n" : : "r" (t) : "memory");
+        return t;
+  }
+};
+
 #endif // OS_CPU_AIX_PPC_ATOMIC_AIX_PPC_HPP