src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp

rev 7471 : 8060025: Object copy time regressions after JDK-8031323 and JDK-8057536
Summary: Evaluate and improve object copy time by micro-optimizations and splitting out slow and fast paths aggressively.
Reviewed-by:
Contributed-by: Tony Printezis <tprintezis@twitter.com>, Thomas Schatzl <thomas.schatzl@oracle.com>
rev 7472 : [mq]: 8060025-mikael-review1

@@ -2761,11 +2761,11 @@
   case VerifyOption_G1UseMarkWord:
     return false;
   default:
     ShouldNotReachHere();
   }
-  return false; // keep some compilers happy
+  return false; // Keep some compilers happy
 }
 
 HeapWord* G1CollectedHeap::top_at_mark_start(HeapRegion* hr, VerifyOption vo) {
   switch (vo) {
   case VerifyOption_G1UsePrevMarking: return hr->prev_top_at_mark_start();

@@ -5767,13 +5767,11 @@
       _ct_bs->clear(MemRegion(r->bottom(), r->end()));
     }
   }
 };
 
-#ifdef PRODUCT
-bool G1CollectedHeap::check_cset_fast_test() { return true; }
-#else
+#ifndef PRODUCT
 class G1VerifyCardTableCleanup: public HeapRegionClosure {
   G1CollectedHeap* _g1h;
   G1SATBCardTableModRefBS* _ct_bs;
 public:
   G1VerifyCardTableCleanup(G1CollectedHeap* g1h, G1SATBCardTableModRefBS* ct_bs)