ARMv7 ubfx support...

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 1088 matching lines @@
                                                        Register outHighReg,
                                                        Register outLowReg) {
   // ARMv7 VFP3 instructions to implement integer to double conversion.
   mov(r7, Operand(inReg, ASR, kSmiTagSize));
   vmov(s15, r7);
   vcvt(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));
+  } 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.
 
   // If the expected number of arguments of the runtime function is
   // constant, we check that the actual number of arguments match the
   // expectation.
   if (f->nargs >= 0 && f->nargs != num_arguments) {
     IllegalOperation(num_arguments);
     return;
   }
@@ skipping 257 matching lines @@
 }
 
 
 void CodePatcher::Emit(Address addr) {
   masm()->emit(reinterpret_cast<Instr>(addr));
 }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal