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Diffstat (limited to 'gcc/testsuite/g++.dg/cpp0x/constexpr-arith-overflow.C')
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp0x/constexpr-arith-overflow.C | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-arith-overflow.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-arith-overflow.C new file mode 100644 index 00000000000..a63c0a1ef54 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-arith-overflow.C @@ -0,0 +1,212 @@ +// PR c++/70507 - integer overflow builtins not constant expressions +// { dg-do compile { target c++11 } } + +#define SCHAR_MAX __SCHAR_MAX__ +#define SHRT_MAX __SHRT_MAX__ +#define INT_MAX __INT_MAX__ +#define LONG_MAX __LONG_MAX__ +#define LLONG_MAX __LONG_LONG_MAX__ + +#define SCHAR_MIN (-__SCHAR_MAX__ - 1) +#define SHRT_MIN (-__SHRT_MAX__ - 1) +#define INT_MIN (-__INT_MAX__ - 1) +#define LONG_MIN (-__LONG_MAX__ - 1) +#define LLONG_MIN (-__LONG_LONG_MAX__ - 1) + +#define UCHAR_MAX (SCHAR_MAX * 2U + 1) +#define USHRT_MAX (SHRT_MAX * 2U + 1) +#define UINT_MAX (INT_MAX * 2U + 1) +#define ULONG_MAX (LONG_MAX * 2LU + 1) +#define ULLONG_MAX (LLONG_MAX * 2LLU + 1) + +#define USCHAR_MIN (-__USCHAR_MAX__ - 1) +#define USHRT_MIN (-__USHRT_MAX__ - 1) +#define UINT_MIN (-__UINT_MAX__ - 1) +#define ULONG_MIN (-__ULONG_MAX__ - 1) +#define ULLONG_MIN (-__ULONG_LONG_MAX__ - 1) + +#define Assert(expr) static_assert ((expr), #expr) + +template <class T> +constexpr T add (T x, T y, T z = T ()) +{ + return __builtin_add_overflow (x, y, &z) ? 0 : z; +} + +template <class T> +constexpr T sub (T x, T y, T z = T ()) +{ + return __builtin_sub_overflow (x, y, &z) ? 0 : z; +} + +template <class T> +constexpr T mul (T x, T y, T z = T ()) +{ + return __builtin_mul_overflow (x, y, &z) ? 0 : z; +} + +#define TEST_ADD(T, x, y, z) Assert (z == add<T>(x, y)) +#define TEST_SUB(T, x, y, z) Assert (z == sub<T>(x, y)) +#define TEST_MUL(T, x, y, z) Assert (z == mul<T>(x, y)) + + +TEST_ADD (signed char, 0, 0, 0); +TEST_ADD (signed char, 0, SCHAR_MAX, SCHAR_MAX); +TEST_ADD (signed char, 1, SCHAR_MAX, 0); // overflow +TEST_ADD (signed char, SCHAR_MAX, SCHAR_MAX, 0); // overflow +TEST_ADD (signed char, 0, SCHAR_MIN, SCHAR_MIN); +TEST_ADD (signed char, -1, SCHAR_MIN, 0); // overflow + +TEST_ADD (short, 0, 0, 0); +TEST_ADD (short, 0, SHRT_MAX, SHRT_MAX); +TEST_ADD (short, 1, SHRT_MAX, 0); // overflow +TEST_ADD (short, SHRT_MAX, SHRT_MAX, 0); // overflow +TEST_ADD (short, 0, SHRT_MIN, SHRT_MIN); +TEST_ADD (short, -1, SHRT_MIN, 0); // overflow +TEST_ADD (short, SHRT_MIN, SHRT_MIN, 0); // overflow + +TEST_ADD (int, 0, 0, 0); +TEST_ADD (int, 0, INT_MAX, INT_MAX); +TEST_ADD (int, 1, INT_MAX, 0); // overflow +TEST_ADD (int, INT_MAX, INT_MAX, 0); // overflow +TEST_ADD (int, 0, INT_MIN, INT_MIN); +TEST_ADD (int, -1, INT_MIN, 0); // overflow +TEST_ADD (int, INT_MIN, INT_MIN, 0); // overflow + +TEST_ADD (long, 0, 0, 0); +TEST_ADD (long, 0, LONG_MAX, LONG_MAX); +TEST_ADD (long, 1, LONG_MAX, 0); // overflow +TEST_ADD (long, LONG_MAX, LONG_MAX, 0); // overflow +TEST_ADD (long, 0, LONG_MIN, LONG_MIN); +TEST_ADD (long, -1, LONG_MIN, 0); // overflow +TEST_ADD (long, LONG_MIN, LONG_MIN, 0); // overflow + +TEST_ADD (long long, 0, 0, 0); +TEST_ADD (long long, 0, LLONG_MAX, LLONG_MAX); +TEST_ADD (long long, 1, LLONG_MAX, 0); // overflow +TEST_ADD (long long, LLONG_MAX, LLONG_MAX, 0); // overflow +TEST_ADD (long long, 0, LLONG_MIN, LLONG_MIN); +TEST_ADD (long long, -1, LLONG_MIN, 0); // overflow +TEST_ADD (long long, LLONG_MIN, LLONG_MIN, 0); // overflow + +TEST_ADD (unsigned char, 0, 0, 0); +TEST_ADD (unsigned char, 0, UCHAR_MAX, UCHAR_MAX); +TEST_ADD (unsigned char, 1, UCHAR_MAX, 0); // overflow + +TEST_ADD (unsigned char, UCHAR_MAX, UCHAR_MAX, 0); // overflow +TEST_ADD (unsigned short, 0, 0, 0); +TEST_ADD (unsigned short, 0, USHRT_MAX, USHRT_MAX); +TEST_ADD (unsigned short, 1, USHRT_MAX, 0); // overflow +TEST_ADD (unsigned short, USHRT_MAX, USHRT_MAX, 0); // overflow + +TEST_ADD (unsigned, 0, 0, 0); +TEST_ADD (unsigned, 0, UINT_MAX, UINT_MAX); +TEST_ADD (unsigned, 1, UINT_MAX, 0); // overflow +TEST_ADD (unsigned, UINT_MAX, UINT_MAX, 0); // overflow + +TEST_ADD (unsigned long, 0, 0, 0); +TEST_ADD (unsigned long, 0, ULONG_MAX, ULONG_MAX); +TEST_ADD (unsigned long, 1, ULONG_MAX, 0); // overflow +TEST_ADD (unsigned long, ULONG_MAX, ULONG_MAX, 0); // overflow + +TEST_ADD (unsigned long long, 0, 0, 0); +TEST_ADD (unsigned long long, 0, ULLONG_MAX, ULLONG_MAX); +TEST_ADD (unsigned long long, 1, ULLONG_MAX, 0); // overflow +TEST_ADD (unsigned long long, ULLONG_MAX, ULLONG_MAX, 0); // overflow + + +// Make sure the built-ins are accepted in the following contexts +// where constant expressions are required and that they return +// the expected overflow value. + +namespace Enum { + +enum Add { + a0 = __builtin_add_overflow_p ( 1, 1, 0), + a1 = __builtin_add_overflow_p (INT_MAX, 1, 0) +}; + +Assert (a0 == 0); +Assert (a1 == 1); + +enum Sub { + s0 = __builtin_sub_overflow_p ( 1, 1, 0), + s1 = __builtin_sub_overflow_p (INT_MIN, 1, 0) +}; + +Assert (s0 == 0); +Assert (s1 == 1); + +enum Mul { + m0 = __builtin_add_overflow_p ( 1, 1, 0), + m1 = __builtin_add_overflow_p (INT_MAX, INT_MAX, 0) +}; + +Assert (m0 == 0); +Assert (m1 == 1); + +} // namespace Enum + +namespace TemplateArg { + +template <class T, class U, class V, + T x, U y, bool v, bool z = __builtin_add_overflow_p (x, y, V ())> +struct Add { + Assert (z == v); +}; + +template <class T, class U, class V, + T x, U y, bool v, bool z = __builtin_sub_overflow_p (x, y, V ())> +struct Sub { + Assert (z == v); +}; + +template <class T, class U, class V, + T x, U y, bool v, bool z = __builtin_mul_overflow_p (x, y, V ())> +struct Mul { + Assert (z == v); +}; + +template struct Add<int, int, int, 1, 1, false>; +template struct Add<int, int, int, 1, INT_MAX, true>; + +template struct Sub<int, int, int, 1, 1, false>; +template struct Sub<int, int, int, -2, INT_MAX, true>; + +template struct Mul<int, int, int, 1, 1, false>; +template struct Mul<int, int, int, 2, INT_MAX / 2 + 1, true>; + +} // namespace TemplateArg + +#if __cplusplus >= 201402L + +namespace Initializer { + +struct Result { + int res; + bool vflow; +}; + +constexpr Result +add_vflow (int a, int b) +{ +#if 1 + Result res = { a + b, __builtin_add_overflow_p (a, b, int ()) }; +#else + // The following fails to compile because of c++/71391 - error + // on aggregate initialization with side-effects in a constexpr + // function + int c = 0; + Result res = { 0, __builtin_add_overflow (a, b, &c) }; + res.c = c; +#endif + return res; +} + +constexpr Result sum = add_vflow (123, 456); +Assert (sum.res == 123 + 456); +Assert (!sum.vflow); + +} // namespace Initializer + +#endif // __cplusplus >= 201402L |