Examples of errors detected by the V584 diagnostic

V584. Same value is present on both sides of the operator. The expression is incorrect or can be simplified.

Far2l

V584 The 'FADC_ALLDISKS' value is present on both sides of the '==' operator. The expression is incorrect or it can be simplified. far findfile.cpp 3317

enum FINDASKDLGCOMBO
{
  FADC_ALLDISKS,
  FADC_ALLBUTNET,
  ....
};

FindFiles::FindFiles()
{
  ....
  if (   FADC_ALLDISKS + SearchMode == FADC_ALLDISKS     // <=
      || FADC_ALLDISKS + SearchMode == FADC_ALLBUTNET)
  {
    ....
  }
  ....
}

A strange expression FADC_ALLDISKS+SearchMode==FADC_ALLDISKS can be simplified to SearchMode == 0.

Asterisk

V584 The '1' value is present on both sides of the '==' operator. The expression is incorrect or it can be simplified. chan_unistim.c 1095

static void check_send_queue(struct unistimsession *pte)
{
  if (pte->last_buf_available == 1) {
    ....
  }
  else if (pte->last_seq_ack + 1 == pte->seq_server + 1) {  // <=
    ....
  }
}

Ruby MRI

V584 The 'ptr' value is present on both sides of the '==' operator. The expression is incorrect or it can be simplified. string.c 7211

static VALUE
rb_str_split_m(int argc, VALUE *argv, VALUE str)
{
  ....
  char *ptr = RSTRING_PTR(str);
  long len = RSTRING_LEN(str);
  long start = beg;
  ....
  if (ptr+start == ptr+len)
    start++;
  ....
}

Command & Conquer

V584 The 'Current' value is present on both sides of the '!=' operator. The expression is incorrect or it can be simplified. CREDITS.CPP 173

void CreditClass::AI(bool forced, HouseClass *player_ptr, bool logic_only)
{
  ....
  long adder = Credits - Current;
  adder = ABS(adder);
  adder >>= 5;
  adder = Bound(adder, 1L, 71+72);
  if (Current > Credits) adder = -adder;
  Current += adder;
  Countdown = 1;

  if (Current-adder != Current) {        // <=
    IsAudible = true;
    IsUp = (adder > 0);
  }
  ....
}

Similar errors can be found in some other places:

• V584 The 'Current' value is present on both sides of the '!=' operator. The expression is incorrect or it can be simplified. CREDITS.CPP 246