Use page header information to test for InNewSpace.

src/ia32/full-codegen-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 3167 matching lines @@
   __ lea(index_1, CodeGenerator::FixedArrayElementOperand(elements, index_1));
   __ lea(index_2, CodeGenerator::FixedArrayElementOperand(elements, index_2));
 
   // Swap elements.  Use object and temp as scratch registers.
   __ mov(object, Operand(index_1, 0));
   __ mov(temp,   Operand(index_2, 0));
   __ mov(Operand(index_2, 0), object);
   __ mov(Operand(index_1, 0), temp);
 
   NearLabel no_remembered_set;
-  __ InNewSpace(elements, temp, equal, &no_remembered_set);
-  __ CheckPageFlag(elements,
-                   temp,
-                   MemoryChunk::SCAN_ON_SCAVENGE,
-                   not_zero,
+  __ CheckPageFlag(elements, temp,
+                   MemoryChunk::SCAN_ON_SCAVENGE, not_zero,
                    &no_remembered_set);
 
   __ mov(object, elements);
   // Since we are swapping two objects, the incremental marker is not disturbed,
   // so we don't call the stub that handles this.  TODO(gc): Optimize by
   // checking the scan_on_scavenge flag, probably by calling the stub.
   __ RememberedSetHelper(index_1, temp, kDontSaveFPRegs);
   __ RememberedSetHelper(index_2, temp, kDontSaveFPRegs);
 
   __ bind(&no_remembered_set);
@@ skipping 1132 matching lines @@
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32