--- old/src/hotspot/share/opto/macro.cpp	2018-11-30 21:09:29.703623420 +0100
+++ new/src/hotspot/share/opto/macro.cpp	2018-11-30 21:09:29.545624881 +0100
@@ -47,9 +47,13 @@
 #include "opto/subnode.hpp"
 #include "opto/type.hpp"
 #include "runtime/sharedRuntime.hpp"
+#include "utilities/macros.hpp"
 #if INCLUDE_G1GC
 #include "gc/g1/g1ThreadLocalData.hpp"
 #endif // INCLUDE_G1GC
+#if INCLUDE_SHENANDOAHGC
+#include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
+#endif
 
 
 //
@@ -629,6 +633,7 @@
                                    k < kmax && can_eliminate; k++) {
           Node* n = use->fast_out(k);
           if (!n->is_Store() && n->Opcode() != Op_CastP2X &&
+              SHENANDOAHGC_ONLY((!UseShenandoahGC || !ShenandoahBarrierSetC2::is_shenandoah_wb_pre_call(n)) &&)
               !(n->is_ArrayCopy() &&
                 n->as_ArrayCopy()->is_clonebasic() &&
                 n->in(ArrayCopyNode::Dest) == use)) {