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

src/arm64/builtins-arm64.cc

Index: src/arm64/builtins-arm64.cc
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
index e74e4077939bdb0d3924acd4ac3c8cde4db0cdaf..2d878686bbefe10600f841558c1bb0a8b9e65308 100644
--- a/src/arm64/builtins-arm64.cc
+++ b/src/arm64/builtins-arm64.cc
@@ -992,7 +992,11 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
     __ 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,
@@ -1001,14 +1005,14 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
          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);
 }
 
 
@@ -1019,9 +1023,8 @@ void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
   //  - 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.