Port string keyed load IC improvements (r4444) to x64.

src/ia32/codegen-ia32.h

 // Copyright 2010 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 868 matching lines @@
 
   virtual InlineCacheState GetICState() {
     return BinaryOpIC::ToState(runtime_operands_type_);
   }
 };
 
 
 class StringHelper : public AllStatic {
  public:
   // Generates fast code for getting a char code out of a string
-  // object at the given index. May bail out for three reasons (in the
+  // object at the given index. May bail out for four reasons (in the
   // listed order):
   //   * Receiver is not a string (receiver_not_string label).
-  //   * Index is not a positive smi (index_not_positive_smi label).
+  //   * Index is not a smi (index_not_smi label).
+  //   * Index is out of range (index_out_of_range).
   //   * Some other reason (slow_case label). In this case it's
   //     guaranteed that the above conditions are not violated,
   //     e.g. it's safe to assume the receiver is a string and the
-  //     index is a positive smi.
+  //     index is a non-negative smi < length.
   // When successful, object, index, and scratch are clobbered.
   // Otherwise, scratch and result are clobbered.
   static void GenerateFastCharCodeAt(MacroAssembler* masm,
                                      Register object,
                                      Register index,
                                      Register scratch,
                                      Register result,
                                      Label* receiver_not_string,
-                                     Label* index_not_positive_smi,
+                                     Label* index_not_smi,
+                                     Label* index_out_of_range,
                                      Label* slow_case);
 
   // Generates code for creating a one-char string from the given char
   // code. May do a runtime call, so any register can be clobbered
   // and, if the given invoke flag specifies a call, an internal frame
   // is required. In tail call mode the result must be eax register.
   static void GenerateCharFromCode(MacroAssembler* masm,
                                    Register code,
                                    Register result,
                                    InvokeFlag flag);
@@ skipping 172 matching lines @@
     return ObjectBits::encode(object_.code()) |
            AddressBits::encode(addr_.code()) |
            ScratchBits::encode(scratch_.code());
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_CODEGEN_IA32_H_