Fixed incorrect instruction usage in KeyedLoadIC for byte and word...

src/x64/ic-x64.cc

 // Copyright 2009 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 380 matching lines @@
 
   // rax: untagged index
   // rcx: elements array
   __ movq(rcx, FieldOperand(rcx, ExternalArray::kExternalPointerOffset));
   // rcx: base pointer of external storage
   switch (array_type) {
     case kExternalByteArray:
       __ movsxbq(rax, Operand(rcx, rax, times_1, 0));
       break;
     case kExternalUnsignedByteArray:
-      __ movb(rax, Operand(rcx, rax, times_1, 0));
+      __ movzxbq(rax, Operand(rcx, rax, times_1, 0));
       break;
     case kExternalShortArray:
       __ movsxwq(rax, Operand(rcx, rax, times_2, 0));
       break;
     case kExternalUnsignedShortArray:
       __ movzxwq(rax, Operand(rcx, rax, times_2, 0));
       break;
     case kExternalIntArray:
       __ movsxlq(rax, Operand(rcx, rax, times_4, 0));
       break;
@@ skipping 900 matching lines @@
 
   // Cache miss: Jump to runtime.
   Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal