*** old/src/cpu/sparc/vm/vm_version_sparc.cpp	Thu Sep  1 09:31:10 2011
--- new/src/cpu/sparc/vm/vm_version_sparc.cpp	Thu Sep  1 09:31:10 2011

*** 73,82 ****
--- 73,100 ----
    if (AllocatePrefetchStyle == 3 && !has_blk_init()) {
      warning("BIS instructions are not available on this CPU");
      FLAG_SET_DEFAULT(AllocatePrefetchStyle, 1);
    }
  
+   if (has_v9()) {
+     assert(ArraycopySrcPrefetchDistance < 4096, "invalid value");
+     if (ArraycopySrcPrefetchDistance >= 4096)
+       ArraycopySrcPrefetchDistance = 4064;
+     assert(ArraycopyDstPrefetchDistance < 4096, "invalid value");
+     if (ArraycopyDstPrefetchDistance >= 4096)
+       ArraycopyDstPrefetchDistance = 4064;
+   } else {
+     if (ArraycopySrcPrefetchDistance > 0) {
+       warning("prefetch instructions are not available on this CPU");
+       FLAG_SET_DEFAULT(ArraycopySrcPrefetchDistance, 0);
+     }
+     if (ArraycopyDstPrefetchDistance > 0) {
+       warning("prefetch instructions are not available on this CPU");
+       FLAG_SET_DEFAULT(ArraycopyDstPrefetchDistance, 0);
+     }
+   }
+ 
    UseSSE = 0; // Only on x86 and x64
  
    _supports_cx8 = has_v9();
  
    if (is_niagara()) {

*** 178,187 ****
--- 196,215 ----
    } else if (UseBlockZeroing) {
      warning("BIS zeroing instructions are not available on this CPU");
      FLAG_SET_DEFAULT(UseBlockZeroing, false);
    }
  
+   assert(BlockCopyLowLimit > 0, "invalid value");
+   if (has_block_zeroing()) { // has_blk_init() && is_T4(): core's local L2 cache
+     if (FLAG_IS_DEFAULT(UseBlockCopy)) {
+       FLAG_SET_DEFAULT(UseBlockCopy, true);
+     }
+   } else if (UseBlockCopy) {
+     warning("BIS instructions are not available or expensive on this CPU");
+     FLAG_SET_DEFAULT(UseBlockCopy, false);
+   }
+ 
  #ifdef COMPILER2
    // T4 and newer Sparc cpus have fast RDPC.
    if (has_fast_rdpc() && FLAG_IS_DEFAULT(UseRDPCForConstantTableBase)) {
  //    FLAG_SET_DEFAULT(UseRDPCForConstantTableBase, true);
    }