Provide baseline for experimental GC implementation.

src/x64/code-stubs-x64.cc

 // Copyright 2010 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 1953 matching lines @@
 
   // rbx: last_match_info backing store (FixedArray)
   // rdx: number of capture registers
   // Store the capture count.
   __ Integer32ToSmi(kScratchRegister, rdx);
   __ movq(FieldOperand(rbx, RegExpImpl::kLastCaptureCountOffset),
           kScratchRegister);
   // Store last subject and last input.
   __ movq(rax, Operand(rsp, kSubjectOffset));
   __ movq(FieldOperand(rbx, RegExpImpl::kLastSubjectOffset), rax);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   __ movq(rcx, rbx);
   __ RecordWrite(rcx, RegExpImpl::kLastSubjectOffset, rax, rdi);
+#endif
   __ movq(rax, Operand(rsp, kSubjectOffset));
   __ movq(FieldOperand(rbx, RegExpImpl::kLastInputOffset), rax);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   __ movq(rcx, rbx);
   __ RecordWrite(rcx, RegExpImpl::kLastInputOffset, rax, rdi);
+#endif
 
   // Get the static offsets vector filled by the native regexp code.
   __ movq(rcx, ExternalReference::address_of_static_offsets_vector());
 
   // rbx: last_match_info backing store (FixedArray)
   // rcx: offsets vector
   // rdx: number of capture registers
   NearLabel next_capture, done;
   // Capture register counter starts from number of capture registers and
   // counts down until wraping after zero.
@@ skipping 2111 matching lines @@
 
 void ICCompareStub::GenerateMiss(MacroAssembler* masm) {
   UNIMPLEMENTED();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64