Porting r9605 to x64 (elements kind conversion in generated code).

src/x64/macro-assembler-x64.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 308 matching lines @@
 
   // Clobber clobbered input registers when running with the debug-code flag
   // turned on to provoke errors.
   if (emit_debug_code()) {
     movq(value, BitCast<int64_t>(kZapValue), RelocInfo::NONE);
     movq(dst, BitCast<int64_t>(kZapValue), RelocInfo::NONE);
   }
 }
 
 
+void MacroAssembler::RecordWriteArray(Register object,
+                                      Register value,
+                                      Register index,
+                                      SaveFPRegsMode save_fp,
+                                      RememberedSetAction remembered_set_action,
+                                      SmiCheck smi_check) {
+  // First, check if a write barrier is even needed. The tests below
+  // catch stores of Smis.
+  Label done;
+
+  // Skip barrier if writing a smi.
+  if (smi_check == INLINE_SMI_CHECK) {
+    JumpIfSmi(value, &done);
+  }
+
+  // Array access: calculate the destination address. Index is not a smi.
+  Register dst = index;
+  lea(dst, Operand(object, index, times_pointer_size,
+                   FixedArray::kHeaderSize - kHeapObjectTag));
+
+  RecordWrite(
+      object, dst, value, save_fp, remembered_set_action, OMIT_SMI_CHECK);
+
+  bind(&done);
+
+  // Clobber clobbered input registers when running with the debug-code flag
+  // turned on to provoke errors.
+  if (emit_debug_code()) {
+    movq(value, Immediate(BitCast<int64_t>(kZapValue)));
+    movq(index, Immediate(BitCast<int64_t>(kZapValue)));
+  }
+}
+
+
 void MacroAssembler::RecordWrite(Register object,
                                  Register address,
                                  Register value,
                                  SaveFPRegsMode fp_mode,
                                  RememberedSetAction remembered_set_action,
                                  SmiCheck smi_check) {
   // The compiled code assumes that record write doesn't change the
   // context register, so we check that none of the clobbered
   // registers are rsi.
   ASSERT(!value.is(rsi) && !address.is(rsi));
@@ skipping 3935 matching lines @@
 
   and_(bitmap_scratch, Immediate(~Page::kPageAlignmentMask));
   addl(Operand(bitmap_scratch, MemoryChunk::kLiveBytesOffset), length);
 
   bind(&done);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64