Fix bug in the ARM full code generator for inlined count...

src/arm/full-codegen-arm.cc

 // Copyright 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 1575 matching lines @@
             __ str(r0, MemOperand(sp, 2 * kPointerSize));
             break;
         }
         break;
     }
   }
 
 
   // Inline smi case if we are in a loop.
   Label stub_call, done;
+  int count_value = expr->op() == Token::INC ? 1 : -1;
   if (loop_depth() > 0) {
-    __ add(r0, r0, Operand(expr->op() == Token::INC
-                           ? Smi::FromInt(1)
-                           : Smi::FromInt(-1)));
+    __ add(r0, r0, Operand(Smi::FromInt(count_value)), SetCC);
     __ b(vs, &stub_call);
     // We could eliminate this smi check if we split the code at
     // the first smi check before calling ToNumber.
     __ tst(r0, Operand(kSmiTagMask));
     __ b(eq, &done);
     __ bind(&stub_call);
     // Call stub. Undo operation first.
-    __ sub(r0, r0, Operand(r1));
+    __ sub(r0, r0, Operand(Smi::FromInt(count_value)));
   }
-  __ mov(r1, Operand(expr->op() == Token::INC
-                     ? Smi::FromInt(1)
-                     : Smi::FromInt(-1)));
+  __ mov(r1, Operand(Smi::FromInt(count_value)));
   GenericBinaryOpStub stub(Token::ADD, NO_OVERWRITE);
   __ CallStub(&stub);
   __ bind(&done);
 
   // Store the value returned in r0.
   switch (assign_type) {
     case VARIABLE:
       if (expr->is_postfix()) {
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Expression::kEffect);
@@ skipping 235 matching lines @@
   __ pop(result_register());
   ASSERT_EQ(1, kSmiTagSize + kSmiShiftSize);
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal