Since v8:13964, flags is uint32, so always use cmp on ARM.

src/arm/stub-cache-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 84 matching lines @@
 
   // Check that the flags match what we're looking for.
   Register flags_reg = base_addr;
   base_addr = no_reg;
   __ ldr(flags_reg, FieldMemOperand(code, Code::kFlagsOffset));
   // It's a nice optimization if this constant is encodable in the bic insn.
 
   uint32_t mask = Code::kFlagsNotUsedInLookup;
   ASSERT(__ ImmediateFitsAddrMode1Instruction(mask));
   __ bic(flags_reg, flags_reg, Operand(mask));
-  // Using cmn and the negative instead of cmp means we can use movw.
-  if (flags < 0) {
-    __ cmn(flags_reg, Operand(-flags));
-  } else {
-    __ cmp(flags_reg, Operand(flags));
-  }
+  __ cmp(flags_reg, Operand(flags));
   __ b(ne, &miss);
 
 #ifdef DEBUG
     if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
       __ jmp(&miss);
     } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
       __ jmp(&miss);
     }
 #endif
 
@@ skipping 3726 matching lines @@
     TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM