Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/arm/lithium-codegen-arm.cc

 // 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 1651 matching lines @@
   }
 
   switch (instr->op()) {
     case Token::BIT_AND:
       __ and_(result, left, right);
       break;
     case Token::BIT_OR:
       __ orr(result, left, right);
       break;
     case Token::BIT_XOR:
-      __ eor(result, left, right);
+      if (right_op->IsConstantOperand() && right.immediate() == int32_t(~0)) {
+        __ mvn(result, Operand(left));
+      } else {
+        __ eor(result, left, right);
+      }
       break;
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
 void LCodeGen::DoShiftI(LShiftI* instr) {
   // Both 'left' and 'right' are "used at start" (see LCodeGen::DoShift), so
@@ skipping 263 matching lines @@
     __ strb(value, MemOperand(ip, index));
   } else {
     // MemOperand with ip as the base register is not allowed for strh, so
     // we do the address calculation explicitly.
     __ add(ip, ip, Operand(index, LSL, 1));
     __ strh(value, MemOperand(ip));
   }
 }
 
 
-void LCodeGen::DoBitNotI(LBitNotI* instr) {
-  Register input = ToRegister(instr->value());
-  Register result = ToRegister(instr->result());
-  __ mvn(result, Operand(input));
-}
-
-
 void LCodeGen::DoThrow(LThrow* instr) {
   Register input_reg = EmitLoadRegister(instr->value(), ip);
   __ push(input_reg);
   CallRuntime(Runtime::kThrow, 1, instr);
 
   if (FLAG_debug_code) {
     __ stop("Unreachable code.");
   }
 }
 
@@ skipping 3866 matching lines @@
   __ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal