A64: Fix register usage in LCodeGen::ArgumentsLength

src/a64/lithium-codegen-a64.cc

 // Copyright 2013 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 1630 matching lines @@
     __ Ldr(result,
            MemOperand(previous_fp, StandardFrameConstants::kContextOffset));
     __ Cmp(result, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
     __ Csel(result, fp, previous_fp, ne);
   }
 }
 
 
 void LCodeGen::DoArgumentsLength(LArgumentsLength* instr) {
   Register elements = ToRegister(instr->elements());
-  Register result = ToRegister(instr->result());
+  Register result = ToRegister32(instr->result());
   Label done;
 
   // If no arguments adaptor frame the number of arguments is fixed.
   __ Cmp(fp, elements);
   __ Mov(result, scope()->num_parameters());
   __ B(eq, &done);
 
   // Arguments adaptor frame present. Get argument length from there.
-  __ Ldr(result, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ Ldrsw(result,
-           UntagSmiMemOperand(result,
-                              ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ Ldr(result.X(), MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ Ldr(result,
+         UntagSmiMemOperand(result.X(),
+                            ArgumentsAdaptorFrameConstants::kLengthOffset));
 
   // Argument length is in result register.
   __ Bind(&done);
 }
 
 
 void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
   DoubleRegister left = ToDoubleRegister(instr->left());
   DoubleRegister right = ToDoubleRegister(instr->right());
   DoubleRegister result = ToDoubleRegister(instr->result());
@@ skipping 4041 matching lines @@
   __ Bind(&out_of_object);
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal