ARMv7 ubfx support...

src/arm/macro-assembler-arm.h

 // Copyright 2006-2009 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 276 matching lines @@
 
   inline void BranchOnNotSmi(Register value, Label* not_smi_label) {
     tst(value, Operand(kSmiTagMask));
     b(ne, not_smi_label);
   }
 
   // Generates code for reporting that an illegal operation has
   // occurred.
   void IllegalOperation(int num_arguments);
 
+  // Get the number of least significant bits from a register
+  void GetLeastBitsFromSmi(Register dst, Register src, int num_least_bits);
+
   // Uses VFP instructions to Convert a Smi to a double.
   void IntegerToDoubleConversionWithVFP3(Register inReg,
                                          Register outHighReg,
                                          Register outLowReg);
 
 
   // ---------------------------------------------------------------------------
   // Runtime calls
 
   // Call a code stub.
@@ skipping 157 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_