A64: Implement Peek/PokePair

src/a64/code-stubs-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 6339 matching lines @@
   // x3     index_smi        element index as smi
   // sp[0]  array_index_smi  array literal index in function as smi
   // sp[1]  array            array literal
 
   Register value = x0;
   Register index_smi = x3;
 
   Register array = x1;
   Register array_map = x2;
   Register array_index_smi = x4;
-  // TODO(jbramley): Implement PeekPair and use it here.
-  __ Peek(array, 1 * kPointerSize);
-  __ Peek(array_index_smi, 0 * kPointerSize);
+  __ PeekPair(array_index_smi, array, 0);
   __ Ldr(array_map, FieldMemOperand(array, JSObject::kMapOffset));
 
   Label double_elements, smi_element, fast_elements, slow_elements;
   __ CheckFastElements(array_map, x10, &double_elements);
   __ JumpIfSmi(value, &smi_element);
   __ CheckFastSmiElements(array_map, x10, &fast_elements);
 
   // Store into the array literal requires an elements transition. Call into
   // the runtime.
   __ Bind(&slow_elements);
@@ skipping 688 matching lines @@
   __ Bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64