[interpreter]: Changes to interpreter builtins for accumulator and register file registers.

src/arm64/builtins-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
@@ skipping 971 matching lines @@
 
   // Perform stack guard check.
   {
     Label ok;
     __ CompareRoot(jssp, Heap::kStackLimitRootIndex);
     __ B(hs, &ok);
     __ CallRuntime(Runtime::kStackGuard, 0);
     __ Bind(&ok);
   }
 
-  // Load bytecode offset and dispatch table into registers.
+  // Load accumulator, register file, bytecode offset, dispatch table into
+  // registers.
+  __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
+  __ Sub(kInterpreterRegisterFileRegister, fp,
+         Operand(kPointerSize + StandardFrameConstants::kFixedFrameSizeFromFp));
   __ Mov(kInterpreterBytecodeOffsetRegister,
          Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ LoadRoot(kInterpreterDispatchTableRegister,
               Heap::kInterpreterTableRootIndex);
   __ Add(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
 
   // Dispatch to the first bytecode handler for the function.
-  __ Ldrb(x0, MemOperand(kInterpreterBytecodeArrayRegister,
+  __ Ldrb(x1, MemOperand(kInterpreterBytecodeArrayRegister,
                          kInterpreterBytecodeOffsetRegister));
-  __ Mov(x0, Operand(x0, LSL, kPointerSizeLog2));
-  __ Ldr(ip0, MemOperand(kInterpreterDispatchTableRegister, x0));
+  __ Mov(x1, Operand(x1, LSL, kPointerSizeLog2));
+  __ Ldr(ip0, MemOperand(kInterpreterDispatchTableRegister, x1));
   // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
   // and header removal.
   __ Add(ip0, ip0, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ Jump(ip0);
+  __ Call(ip0);
 }
 
 
 void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
   // TODO(rmcilroy): List of things not currently dealt with here but done in
   // fullcodegen's EmitReturnSequence.
   //  - Supporting FLAG_trace for Runtime::TraceExit.
   //  - Support profiler (specifically decrementing profiling_counter
   //    appropriately and calling out to HandleInterrupts if necessary).
 
-  // Load return value into x0.
-  __ ldr(x0, MemOperand(fp, -kPointerSize -
-                                StandardFrameConstants::kFixedFrameSizeFromFp));
+  // The return value is in accumulator, which is already in x0.
+
   // Leave the frame (also dropping the register file).
   __ LeaveFrame(StackFrame::JAVA_SCRIPT);
   // Drop receiver + arguments.
   // TODO(rmcilroy): Get number of arguments from BytecodeArray.
   __ Drop(1, kXRegSize);
   __ Ret();
 }
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
@@ skipping 895 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM