Optionally use 31-bits SMI value for 64-bit system

src/x64/macro-assembler-x64.h

 // Copyright 2012 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 630 matching lines @@
 
   // Bitwise operations.
   void SmiNot(Register dst, Register src);
   void SmiAnd(Register dst, Register src1, Register src2);
   void SmiOr(Register dst, Register src1, Register src2);
   void SmiXor(Register dst, Register src1, Register src2);
   void SmiAndConstant(Register dst, Register src1, Smi* constant);
   void SmiOrConstant(Register dst, Register src1, Smi* constant);
   void SmiXorConstant(Register dst, Register src1, Smi* constant);
 
+#if !V8_USE_31_BITS_SMI_VALUE
   void SmiShiftLeftConstant(Register dst,
                             Register src,
                             int shift_value);
+#else
+  void SmiShiftLeftConstant(Register dst,
+                            Register src,
+                            int shift_value,
+                            Label* on_not_smi_result);
+#endif
   void SmiShiftLogicalRightConstant(Register dst,
                                   Register src,
                                   int shift_value,
                                   Label* on_not_smi_result,
                                   Label::Distance near_jump = Label::kFar);
   void SmiShiftArithmeticRightConstant(Register dst,
                                        Register src,
                                        int shift_value);
 
   // Shifts a smi value to the left, and returns the result if that is a smi.
   // Uses and clobbers rcx, so dst may not be rcx.
+#if !V8_USE_31_BITS_SMI_VALUE
   void SmiShiftLeft(Register dst,
                     Register src1,
                     Register src2);
+#else
+  void SmiShiftLeft(Register dst,
+                    Register src1,
+                    Register src2,
+                    Label* on_not_smi_result);
+#endif
   // Shifts a smi value to the right, shifting in zero bits at the top, and
   // returns the unsigned intepretation of the result if that is a smi.
   // Uses and clobbers rcx, so dst may not be rcx.
   void SmiShiftLogicalRight(Register dst,
                             Register src1,
                             Register src2,
                             Label* on_not_smi_result,
                             Label::Distance near_jump = Label::kFar);
   // Shifts a smi value to the right, sign extending the top, and
   // returns the signed intepretation of the result. That will always
@@ skipping 857 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_