src/share/vm/adlc/formssel.cpp

rev 3419 : 7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
Summary: use shorter instruction sequences for atomic add and atomic exchange when possible.
Reviewed-by:

*** 749,758 ****
--- 749,759 ----
         (!strcmp(_matrule->_rChild->_opType,"CastPP")     ||  // new result type
          !strcmp(_matrule->_rChild->_opType,"CastX2P")    ||  // new result type
          !strcmp(_matrule->_rChild->_opType,"DecodeN")    ||
          !strcmp(_matrule->_rChild->_opType,"EncodeP")    ||
          !strcmp(_matrule->_rChild->_opType,"LoadN")      ||
+         !strcmp(_matrule->_rChild->_opType,"GetAndSetN") ||
          !strcmp(_matrule->_rChild->_opType,"LoadNKlass") ||
          !strcmp(_matrule->_rChild->_opType,"CreateEx")   ||  // type of exception
          !strcmp(_matrule->_rChild->_opType,"CheckCastPP")) ) return true;
    else if ( is_ideal_load() == Form::idealP )                return true;
    else if ( is_ideal_store() != Form::none  )                return true;
*** 3397,3407 ****
      "LoadRange", "LoadKlass", "LoadNKlass", "LoadL_unaligned", "LoadD_unaligned",
      "LoadPLocked",
      "StorePConditional", "StoreIConditional", "StoreLConditional",
      "CompareAndSwapI", "CompareAndSwapL", "CompareAndSwapP", "CompareAndSwapN",
      "StoreCM",
!     "ClearArray"
    };
    int cnt = sizeof(needs_ideal_memory_list)/sizeof(char*);
    if( strcmp(_opType,"PrefetchRead")==0 ||
        strcmp(_opType,"PrefetchWrite")==0 ||
        strcmp(_opType,"PrefetchAllocation")==0 )
--- 3398,3410 ----
      "LoadRange", "LoadKlass", "LoadNKlass", "LoadL_unaligned", "LoadD_unaligned",
      "LoadPLocked",
      "StorePConditional", "StoreIConditional", "StoreLConditional",
      "CompareAndSwapI", "CompareAndSwapL", "CompareAndSwapP", "CompareAndSwapN",
      "StoreCM",
!     "ClearArray", 
!     "GetAndAddI", "GetAndSetI", "GetAndSetP",
!     "GetAndAddL", "GetAndSetL", "GetAndSetN",
    };
    int cnt = sizeof(needs_ideal_memory_list)/sizeof(char*);
    if( strcmp(_opType,"PrefetchRead")==0 ||
        strcmp(_opType,"PrefetchWrite")==0 ||
        strcmp(_opType,"PrefetchAllocation")==0 )