Incremental mode now works for x64. The only difference

src/ia32/macro-assembler-ia32.h

 // 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 75 matching lines @@
                            SaveFPRegsMode save_fp,
                            RememberedSetFinalAction and_then);
 
   void CheckPageFlag(Register object,
                      Register scratch,
                      MemoryChunk::MemoryChunkFlags flag,
                      Condition cc,
                      Label* condition_met,
                      Label::Distance condition_met_distance = Label::kFar);
 
-  void InNewSpace(Register object,
-                  Register scratch,
-                  Condition cc,
-                  Label* condition_met,
-                  Label::Distance condition_met_distance = Label::kFar);
+  // Check if object is in new space.  Jumps if the object is not in new space.
+  // The register scratch can be object itself, but it will be clobbered.
+  void JumpIfNotInNewSpace(Register object,
+                           Register scratch,
+                           Label* branch,
+                           Label::Distance distance = Label::kFar) {
+    InNewSpace(object, scratch, zero, branch, distance);
+  }
+
+  // Check if object is in new space.  Jumps if the object is in new space.
+  // The register scratch can be object itself, but it will be clobbered.
+  void JumpIfInNewSpace(Register object,
+                        Register scratch,
+                        Label* branch,
+                        Label::Distance distance = Label::kFar) {
+    InNewSpace(object, scratch, not_zero, branch, distance);
+  }
 
   // Check if an object has a given incremental marking color.  Also uses ecx!
-  // The color bits are found by splitting the address at the bit offset
-  // indicated by the mask: bits that are zero in the mask are used for the
-  // address of the bitmap, and bits that are one in the mask are used for the
-  // index of the bit.
   void HasColor(Register object,
                 Register scratch0,
                 Register scratch1,
                 Label* has_color,
                 Label::Distance has_color_distance,
                 int first_bit,
                 int second_bit);
 
   void IsBlack(Register object,
                Register scratch0,
@@ skipping 661 matching lines @@
                                AllocationFlags flags);
   void UpdateAllocationTopHelper(Register result_end, Register scratch);
 
   // Helper for PopHandleScope.  Allowed to perform a GC and returns
   // NULL if gc_allowed.  Does not perform a GC if !gc_allowed, and
   // possibly returns a failure object indicating an allocation failure.
   MUST_USE_RESULT MaybeObject* PopHandleScopeHelper(Register saved,
                                                     Register scratch,
                                                     bool gc_allowed);
 
+  // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
+  void InNewSpace(Register object,
+                  Register scratch,
+                  Condition cc,
+                  Label* condition_met,
+                  Label::Distance condition_met_distance = Label::kFar);
+
   // Helper for finding the mark bits for an address.  Afterwards, the
   // bitmap register points at the word with the mark bits and the mask
   // the position of the first bit.  Uses ecx as scratch and leaves addr_reg
   // unchanged.
   inline void GetMarkBits(Register addr_reg,
                           Register bitmap_reg,
                           Register mask_reg);
 
   // Compute memory operands for safepoint stack slots.
   Operand SafepointRegisterSlot(Register reg);
@@ skipping 75 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_