src/share/vm/opto/library_call.cpp

*** 2470,2482 ****
    // Some accesses require access atomicity for all types, notably longs and doubles.
    // When AlwaysAtomicAccesses is enabled, all accesses are atomic.
    bool requires_atomic_access = false;
    switch (kind) {
        case Relaxed:
-       case Opaque:
            requires_atomic_access = AlwaysAtomicAccesses;
            break;
        case Acquire:
        case Release:
        case Volatile:
            requires_atomic_access = true;
            break;
--- 2470,2483 ----
    // Some accesses require access atomicity for all types, notably longs and doubles.
    // When AlwaysAtomicAccesses is enabled, all accesses are atomic.
    bool requires_atomic_access = false;
    switch (kind) {
        case Relaxed:
            requires_atomic_access = AlwaysAtomicAccesses;
            break;
+       case Opaque:
+           // Opaque accesses are atomic.
        case Acquire:
        case Release:
        case Volatile:
            requires_atomic_access = true;
            break;