C++ (Cpp) __builtin_sadd_overflow Examples

Example #1

File: cpl_safemaths.hpp Project: OSGeo/gdal

inline CPLSafeInt<int> operator+( const CPLSafeInt<int>& A,
                                  const CPLSafeInt<int>& B )
{
#ifdef BUILTIN_OVERFLOW_CHECK_AVAILABLE
    int res;
    if( __builtin_sadd_overflow(A.v(), B.v(), &res) )
        throw CPLSafeIntOverflow();
    return CPLSM(res);
#elif defined(_MSC_VER)
    msl::utilities::SafeInt<int, CPLMSVCSafeIntException> A2(A.v());
    msl::utilities::SafeInt<int, CPLMSVCSafeIntException> B2(B.v());
    return CPLSM(static_cast<int>(A2 + B2));
#elif defined(CPL_HAS_GINT64)
    const int a = A.v();
    const int b = B.v();
    const GInt64 res = static_cast<GInt64>(a) + b;
    if( res < std::numeric_limits<int>::min() ||
        res > std::numeric_limits<int>::max() )
    {
        throw CPLSafeIntOverflow();
    }
    return CPLSM(static_cast<int>(res));
#else
    return SafeAddSigned(A,B);
#endif
}

Example #2

File: functions.c Project: supercoffee/insolent-prune

/*
https://codereview.stackexchange.com/questions/37177/simpler-method-to-detect-int-overflow
*/
int safe_add(int32_t a, int32_t b, int * error) {

    int32_t result;

    int overflow = __builtin_sadd_overflow(a, b, &result);
    if (overflow){
      *error = overflow;
    }
    return result;
}

Example #3

File: builtins-overflow.cpp Project: LegalizeAdulthood/clang

constexpr Result<int> sadd(int lhs, int rhs) {
  int sum{};
  return {__builtin_sadd_overflow(lhs, rhs, &sum), sum};
}

Example #4

File: pr63884.c Project: 0day-ci/gcc

int
foo (int x, int y)
{
  int r;
  return __builtin_sadd_overflow (x, y, &r);
}