PPC/s390: [heap] New heuristics for incremental marking step size.

src/ppc/code-stubs-ppc.cc

Index: src/ppc/code-stubs-ppc.cc
diff --git a/src/ppc/code-stubs-ppc.cc b/src/ppc/code-stubs-ppc.cc
index 82318685dfd156b54fdcb497d4174cddfc9663c6..327014cb780ecd2f179f8e9002d1e3c3d5afab45 100644
--- a/src/ppc/code-stubs-ppc.cc
+++ b/src/ppc/code-stubs-ppc.cc
@@ -3373,19 +3373,6 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
   Label need_incremental;
   Label need_incremental_pop_scratch;
 
-  DCHECK((~Page::kPageAlignmentMask & 0xffff) == 0);
-  __ lis(r0, Operand((~Page::kPageAlignmentMask >> 16)));
-  __ and_(regs_.scratch0(), regs_.object(), r0);
-  __ LoadP(
-      regs_.scratch1(),
-      MemOperand(regs_.scratch0(), MemoryChunk::kWriteBarrierCounterOffset));
-  __ subi(regs_.scratch1(), regs_.scratch1(), Operand(1));
-  __ StoreP(
-      regs_.scratch1(),
-      MemOperand(regs_.scratch0(), MemoryChunk::kWriteBarrierCounterOffset));
-  __ cmpi(regs_.scratch1(), Operand::Zero());  // PPC, we could do better here
-  __ blt(&need_incremental);
-
   // Let's look at the color of the object:  If it is not black we don't have
   // to inform the incremental marker.
   __ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);