Incremental mode now works for x64. The only difference

src/ia32/code-stubs-ia32.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6249 matching lines @@
 }
 
 
 void RecordWriteStub::GenerateIncremental(MacroAssembler* masm) {
   regs_.Save(masm);
 
   if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
     Label dont_need_remembered_set;
 
     __ mov(regs_.scratch0(), Operand(regs_.address(), 0));
-    __ InNewSpace(regs_.scratch0(),
-                  regs_.scratch0(),
-                  zero,
-                  &dont_need_remembered_set);
+    __ JumpIfNotInNewSpace(regs_.scratch0(),
+                           regs_.scratch0(),
+                           &dont_need_remembered_set);
 
     __ CheckPageFlag(regs_.object(),
                      regs_.scratch0(),
                      MemoryChunk::SCAN_ON_SCAVENGE,
                      not_zero,
                      &dont_need_remembered_set);
 
     // First notify the incremental marker if necessary, then update the
     // remembered set.
     CheckNeedsToInformIncrementalMarker(
         masm, kRememberedSetOnNoNeedToInformIncrementalMarker);
     InformIncrementalMarker(masm);
     regs_.Restore(masm);
     __ RememberedSetHelper(
         address_, value_, save_fp_regs_mode_, MacroAssembler::kReturnAtEnd);
 
     __ bind(&dont_need_remembered_set);
   }
 
   CheckNeedsToInformIncrementalMarker(
       masm, kReturnOnNoNeedToInformIncrementalMarker);
   InformIncrementalMarker(masm);
   regs_.Restore(masm);
   __ ret(0);
 }
 
 
 void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm) {
   regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode_);
-  // TODO(gc) we are assuming that xmm registers are not modified by
-  // the C function we are calling.
   int argument_count = 3;
   __ PrepareCallCFunction(argument_count, regs_.scratch0());
   __ mov(Operand(esp, 0 * kPointerSize), regs_.object());
   __ mov(regs_.scratch0(), Operand(regs_.address(), 0));
   __ mov(Operand(esp, 1 * kPointerSize), regs_.scratch0());  // Value.
   __ mov(Operand(esp, 2 * kPointerSize),
          Immediate(ExternalReference::isolate_address()));
   // TODO(gc): Create a fast version of this C function that does not duplicate
   // the checks done in the stub.
   __ CallCFunction(
@@ skipping 53 matching lines @@
 
   // Fall through when we need to inform the incremental marker.
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32