X64 implementation: Emit correct merge code for virtual frames at CFG merges.

src/x64/macro-assembler-x64.cc

 // Copyright 2009 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 249 matching lines @@
     movq(kScratchRegister, Immediate(x));
   } else if (is_uint32(x)) {
     movl(kScratchRegister, Immediate(x));
   } else {
     movq(kScratchRegister, x, RelocInfo::NONE);
   }
   movq(dst, kScratchRegister);
 }
 
 
+bool MacroAssembler::IsUnsafeSmi(Smi* value) {
+  return false;
+}
+
+void MacroAssembler::LoadUnsafeSmi(Register dst, Smi* source) {
+  UNIMPLEMENTED();
+}
+
+
+void MacroAssembler::Move(Register dst, Handle<Object> source) {
+  if (source->IsSmi()) {
+    if (IsUnsafeSmi(source)) {
+      LoadUnsafeSmi(dst, source);
+    } else {
+      movq(dst, source, RelocInfo::NONE);
+    }
+  } else {
+    movq(dst, source, RelocInfo::EMBEDDED_OBJECT);
+  }
+}
+
+
+void MacroAssembler::Move(const Operand& dst, Handle<Object> source) {
+  Move(kScratchRegister, source);
+  movq(dst, kScratchRegister);
+}
+
+
+void MacroAssembler::Cmp(Register dst, Handle<Object> source) {
+  Move(kScratchRegister, source);
+  cmpq(dst, kScratchRegister);
+}
+
+
 void MacroAssembler::Jump(ExternalReference ext) {
   movq(kScratchRegister, ext);
   jmp(kScratchRegister);
 }
 
 
 void MacroAssembler::Jump(Address destination, RelocInfo::Mode rmode) {
   movq(kScratchRegister, destination, rmode);
   jmp(kScratchRegister);
 }
@@ skipping 452 matching lines @@
   push(rcx);
 
   // Clear the top frame.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   movq(kScratchRegister, c_entry_fp_address);
   movq(Operand(kScratchRegister, 0), Immediate(0));
 }
 
 
 } }  // namespace v8::internal