Reduce the amount of full code generated to fill out array literals.

src/x64/full-codegen-x64.cc

 // Copyright 2012 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 1794 matching lines @@
   for (int i = 0; i < length; i++) {
     Expression* subexpr = subexprs->at(i);
     // If the subexpression is a literal or a simple materialized literal it
     // is already set in the cloned array.
     if (subexpr->AsLiteral() != NULL ||
         CompileTimeValue::IsCompileTimeValue(subexpr)) {
       continue;
     }
 
     if (!result_saved) {
-      __ push(rax);
+      __ push(rax);  // array literal
+      __ Push(Smi::FromInt(expr->literal_index()));
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
     if (IsFastObjectElementsKind(constant_elements_kind)) {
       // Fast-case array literal with ElementsKind of FAST_*_ELEMENTS, they
       // cannot transition and don't need to call the runtime stub.
       int offset = FixedArray::kHeaderSize + (i * kPointerSize);
-      __ movq(rbx, Operand(rsp, 0));  // Copy of array literal.
+      __ movq(rbx, Operand(rsp, kPointerSize));  // Copy of array literal.
       __ movq(rbx, FieldOperand(rbx, JSObject::kElementsOffset));
       // Store the subexpression value in the array's elements.
       __ movq(FieldOperand(rbx, offset), result_register());
       // Update the write barrier for the array store.
       __ RecordWriteField(rbx, offset, result_register(), rcx,
                           kDontSaveFPRegs,
                           EMIT_REMEMBERED_SET,
                           INLINE_SMI_CHECK);
     } else {
       // Store the subexpression value in the array's elements.
-      __ movq(rbx, Operand(rsp, 0));  // Copy of array literal.
-      __ movq(rdi, FieldOperand(rbx, JSObject::kMapOffset));
       __ Move(rcx, Smi::FromInt(i));
-      __ Move(rdx, Smi::FromInt(expr->literal_index()));
       StoreArrayLiteralElementStub stub;
       __ CallStub(&stub);
     }
 
     PrepareForBailoutForId(expr->GetIdForElement(i), NO_REGISTERS);
   }
 
   if (result_saved) {
+    __ addq(rsp, Immediate(kPointerSize));  // literal index
     context()->PlugTOS();
   } else {
     context()->Plug(rax);
   }
 }
 
 
 void FullCodeGenerator::VisitAssignment(Assignment* expr) {
   Comment cmnt(masm_, "[ Assignment");
   // Invalid left-hand sides are rewritten to have a 'throw ReferenceError'
@@ skipping 3024 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64