Update and improve support for ARMv7 bitfield instructions....

src/arm/macro-assembler-arm.cc

 // 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 1310 matching lines @@
   vmov(s15, r7);
   vcvt_f64_s32(d7, s15);
   vmov(outLowReg, outHighReg, d7);
 }
 
 
 void MacroAssembler::GetLeastBitsFromSmi(Register dst,
                                          Register src,
                                          int num_least_bits) {
   if (CpuFeatures::IsSupported(ARMv7)) {
-    ubfx(dst, src, Operand(kSmiTagSize), Operand(num_least_bits - 1));
+    ubfx(dst, src, kSmiTagSize, num_least_bits);
   } else {
     mov(dst, Operand(src, ASR, kSmiTagSize));
     and_(dst, dst, Operand((1 << num_least_bits) - 1));
   }
 }
 
 
 void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
   // All parameters are on the stack.  r0 has the return value after call.
 
@@ skipping 425 matching lines @@
 
 void CodePatcher::Emit(Address addr) {
   masm()->emit(reinterpret_cast<Instr>(addr));
 }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM