src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp

rev 50922 : Don't generate arraycopy pre-barrier calls for traversal GC

*** 25,34 ****
--- 25,35 ----
  #include "gc/shenandoah/brooksPointer.hpp"
  #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
  #include "gc/shenandoah/shenandoahConnectionMatrix.hpp"
  #include "gc/shenandoah/shenandoahHeap.hpp"
  #include "gc/shenandoah/shenandoahHeapRegion.hpp"
+ #include "gc/shenandoah/shenandoahHeuristics.hpp"
  #include "gc/shenandoah/shenandoahRuntime.hpp"
  #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
  #include "interpreter/interpreter.hpp"
  #include "interpreter/interp_masm.hpp"
  #include "runtime/sharedRuntime.hpp"
*** 46,55 ****
--- 47,61 ----
  address ShenandoahBarrierSetAssembler::_shenandoah_wb_C = NULL;
  
  void ShenandoahBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
                                                         Register src, Register dst, Register count) {
  
+   if (ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc()) {
+     // Don't need arraycopy-pre-barrier for traversal. No need to pointlessly
+     // call out to runtime.
+     return;
+   }
    bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;
    bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;
    bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
    bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0;