82   return BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);
  83 }
  84 
  85 LIR_Opr ShenandoahBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {
  86   LIRGenerator* gen = access.gen();
  87   BasicType type = access.type();
  88 
  89   LIR_Opr result = gen->new_register(type);
  90   value.load_item();
  91   LIR_Opr value_opr = value.result();
  92 
  93   if (access.is_oop()) {
  94     value_opr = storeval_barrier(access.gen(), value_opr, access.access_emit_info(), access.decorators());
  95   }
  96 
  97   assert(type == T_INT || type == T_OBJECT || type == T_ARRAY LP64_ONLY( || type == T_LONG ), "unexpected type");
  98   LIR_Opr tmp = gen->new_register(T_INT);
  99   __ xchg(access.resolved_addr(), value_opr, result, tmp);
 100 
 101   if (access.is_oop()) {

 102     if (ShenandoahSATBBarrier) {
 103       pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr,
 104                   result /* pre_val */);
 105     }
 106   }
 107 
 108   return result;
 109 }

  82   return BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);
  83 }
  84 
  85 LIR_Opr ShenandoahBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {
  86   LIRGenerator* gen = access.gen();
  87   BasicType type = access.type();
  88 
  89   LIR_Opr result = gen->new_register(type);
  90   value.load_item();
  91   LIR_Opr value_opr = value.result();
  92 
  93   if (access.is_oop()) {
  94     value_opr = storeval_barrier(access.gen(), value_opr, access.access_emit_info(), access.decorators());
  95   }
  96 
  97   assert(type == T_INT || type == T_OBJECT || type == T_ARRAY LP64_ONLY( || type == T_LONG ), "unexpected type");
  98   LIR_Opr tmp = gen->new_register(T_INT);
  99   __ xchg(access.resolved_addr(), value_opr, result, tmp);
 100 
 101   if (access.is_oop()) {
 102     result = load_reference_barrier(access.gen(), result, access.access_emit_info(), true);
 103     if (ShenandoahSATBBarrier) {
 104       pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr,
 105                   result /* pre_val */);
 106     }
 107   }
 108 
 109   return result;
 110 }