Examples of errors detected by the V1063 diagnostic

V1063. The modulo by 1 operation is meaningless. The result will always be zero.

LLVM/Clang

V1063 The modulo by 1 operation is meaningless. The result will always be zero. llvm-stress.cpp 631

void Act() override {
  ....
  // If the value type is a vector, and we allow vector select, then in 50%
  // of the cases generate a vector select.
  if (isa<FixedVectorType>(Val0->getType()) && (getRandom() % 1)) {
    unsigned NumElem =
        cast<FixedVectorType>(Val0->getType())->getNumElements();
    CondTy = FixedVectorType::get(CondTy, NumElem);
  }
  ....
}

Qt

V1063 The modulo by 1 operation is meaningless. The result will always be zero. qm.cpp 549

bool loadQM(Translator &translator, QIODevice &dev, ConversionData &cd)
{
  ....
  case Tag_Translation: {
    int len = read32(m);
    if (len % 1) {                                             // <=
      cd.appendError(QLatin1String("QM-Format error"));
      return false;
    }
    m += 4;
    QString str = QString((const QChar *)m, len/2);
  ....
}

MuseScore

V1063 The modulo by 1 operation is meaningless. The result will always be zero. lyrics.h 85

class Lyrics final : public TextBase
{
  ....
  bool isEven() const { return _no % 1; }
  ....
}

GZDoom

V1063 The modulo by 1 operation is meaningless. The result will always be zero. r_draw_rgba.cpp 328

void SWPalDrawers::DrawUnscaledFuzzColumn(const SpriteDrawerArgs& args)
{
  ....
  int fuzzstep = 1;
  int fuzz = _fuzzpos % FUZZTABLE;

  #ifndef ORIGINAL_FUZZ

  while (count > 0)
  {
    int available = (FUZZTABLE - fuzz);
    int next_wrap = available / fuzzstep;
    if (available % fuzzstep != 0)             // <=
      next_wrap++;
    ....
  }
  ....
}

Xenia

V1063 The modulo by 1 operation is meaningless. The result will always be zero. x64_code_cache_win.cc 299

void Win32X64CodeCache::InitializeUnwindEntry(....)
{
  ....
  if (unwind_info->CountOfCodes % 1)
  {
    // Count of unwind codes must always be even.
    std::memset(&unwind_info->UnwindCode[unwind_info->CountOfCodes + 1], 0,
                sizeof(UNWIND_CODE));
    ....
  }
  ....
}