Thumb2 Backend: Make arithmetic instructions set condition codes by default

src/arm/constants-arm.h

 // Copyright 2011 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 479 matching lines @@
   kOff12Mask  = (1 << 12) - 1,
   kOff8Mask  = (1 << 8) - 1
 };
 
 
 // -----------------------------------------------------------------------------
 // Addressing modes and instruction variants.
 
 // Condition code updating mode.
 enum SBit {
-  SetCC   = 1 << 20,  // Set condition code.
-  LeaveCC = 0 << 20   // Leave condition code unchanged.
+  SetCCBit   = 1 << 20,  // Set condition code.
+  LeaveCCBit = 0 << 20   // Leave condition code unchanged.
 };
 
 
+enum SBitMode {
+  DontCareCC,
+  SetCC,
+  LeaveCC
+};
+
+
 // Status register selection.
 enum SRegister {
   CPSR = 0 << 22,
   SPSR = 1 << 22
 };
 
 
 // Shifter types for Data-processing operands as defined in section A5.1.2.
 enum ShiftOp {
   LSL = 0 << 5,   // Logical shift left.
@@ skipping 511 matching lines @@
   static int Number(const char* name, bool* is_double);
 
  private:
   static const char* names_[kNumVFPRegisters];
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_