llvm-project/clang/test/AST/Interp/intap.cpp

// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -fms-extensions -std=c++11 -verify %s
// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -fms-extensions -std=c++20 -verify %s
// RUN: %clang_cc1 -std=c++11 -fms-extensions -verify=ref %s
// RUN: %clang_cc1 -std=c++20 -fms-extensions -verify=ref %s


using MaxBitInt = _BitInt(128);

constexpr _BitInt(2) A = 0;
constexpr _BitInt(2) B = A + 1;
constexpr _BitInt(2) C = B + 1; // expected-warning {{from 2 to -2}} \
                                // ref-warning {{from 2 to -2}}
static_assert(C == -2, "");


constexpr MaxBitInt A_ = 0;
constexpr MaxBitInt B_ = A_ + 1;
static_assert(B_ == 1, "");


#ifdef __SIZEOF_INT128__
namespace i128 {
  typedef __int128 int128_t;
  typedef unsigned __int128 uint128_t;
  constexpr int128_t I128_1 = 12;
  static_assert(I128_1 == 12, "");
  static_assert(I128_1 != 10, "");
  static_assert(I128_1 != 12, ""); // expected-error{{failed}} \
                                   // ref-error{{failed}} \
                                   // expected-note{{evaluates to}} \
                                   // ref-note{{evaluates to}}

  static const __uint128_t UINT128_MAX =__uint128_t(__int128_t(-1L));
  static_assert(UINT128_MAX == -1, "");

  static const __int128_t INT128_MAX = UINT128_MAX >> (__int128_t)1;
  static_assert(INT128_MAX != 0, "");
  static const __int128_t INT128_MIN = -INT128_MAX - 1;
  constexpr __int128 A = INT128_MAX + 1; // expected-error {{must be initialized by a constant expression}} \
                                         // expected-note {{outside the range}} \
                                         // ref-error {{must be initialized by a constant expression}} \
                                         // ref-note {{outside the range}}
  constexpr int128_t Two = (int128_t)1 << 1ul;
  static_assert(Two == 2, "");
  static_assert(Two, "");
  constexpr bool CastedToBool = Two;
  static_assert(CastedToBool, "");

  constexpr uint128_t AllOnes = ~static_cast<uint128_t>(0);
  static_assert(AllOnes == UINT128_MAX, "");

#if __cplusplus >= 201402L
  template <typename T>
  constexpr T CastFrom(__int128_t A) {
    T B = (T)A;
    return B;
  }
  static_assert(CastFrom<char>(12) == 12, "");
  static_assert(CastFrom<unsigned char>(12) == 12, "");
  static_assert(CastFrom<long>(12) == 12, "");
  static_assert(CastFrom<unsigned short>(12) == 12, "");
  static_assert(CastFrom<int128_t>(12) == 12, "");
  static_assert(CastFrom<float>(12) == 12, "");
  static_assert(CastFrom<double>(12) == 12, "");
  static_assert(CastFrom<long double>(12) == 12, "");

  static_assert(CastFrom<char>(AllOnes) == -1, "");
  static_assert(CastFrom<unsigned char>(AllOnes) == 0xFF, "");
  static_assert(CastFrom<long>(AllOnes) == -1, "");
  static_assert(CastFrom<unsigned short>(AllOnes) == 0xFFFF, "");
  static_assert(CastFrom<int>(AllOnes) == -1, "");
  static_assert(CastFrom<int128_t>(AllOnes) == -1, "");
  static_assert(CastFrom<uint128_t>(AllOnes) == AllOnes, "");

  template <typename T>
  constexpr __int128 CastTo(T A) {
    int128_t B = (int128_t)A;
    return B;
  }
  static_assert(CastTo<char>(12) == 12, "");
  static_assert(CastTo<unsigned char>(12) == 12, "");
  static_assert(CastTo<long>(12) == 12, "");
  static_assert(CastTo<unsigned long long>(12) == 12, "");
  static_assert(CastTo<float>(12) == 12, "");
  static_assert(CastTo<double>(12) == 12, "");
  static_assert(CastTo<long double>(12) == 12, "");
#endif

  constexpr int128_t Error = __LDBL_MAX__; // ref-warning {{implicit conversion of out of range value}} \
                                           // ref-error {{must be initialized by a constant expression}} \
                                           // ref-note {{is outside the range of representable values of type}} \
                                           // expected-warning {{implicit conversion of out of range value}} \
                                           // expected-error {{must be initialized by a constant expression}} \
                                           // expected-note {{is outside the range of representable values of type}}
}

namespace AddSubOffset {
  constexpr __int128 A = 1;
  constexpr int arr[] = {1,2,3};
  constexpr const int *P = arr + A;
  static_assert(*P == 2, "");
  constexpr const int *P2 = P - A;
  static_assert(*P2 == 1,"");
}

#endif