// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s // expected-no-diagnostics #include <limits.h> int a() { const int x = 3; static int z; constexpr int *y = &z; return []() { return __builtin_sub_overflow((int)x, (int)x, (int *)y); }(); } int a2() { const int x = 3; static int z; constexpr int *y = &z; return []() { return __builtin_sub_overflow(x, x, y); }(); } template<typename T> struct Result { bool B; T Value; constexpr bool operator==(const Result<T> &Other) { return B == Other.B && Value == Other.Value; } }; template <typename RET, typename LHS, typename RHS> constexpr Result<RET> add(LHS &&lhs, RHS &&rhs) { RET sum{}; return {__builtin_add_overflow(lhs, rhs, &sum), sum}; } static_assert(add<short>(static_cast<char>(120), static_cast<char>(10)) == Result<short>{false, 130}); static_assert(add<char>(static_cast<short>(120), static_cast<short>(10)) == Result<char>{true, -126}); static_assert(add<unsigned int>(INT_MAX, INT_MAX) == Result<unsigned int>{false, static_cast<unsigned int>(INT_MAX) * 2u}); static_assert(add<int>(static_cast<unsigned int>(INT_MAX), 1u) == Result<int>{true, INT_MIN}); static_assert(add<int>(17, 22) == Result<int>{false, 39}); static_assert(add<int>(INT_MAX - 22, 24) == Result<int>{true, INT_MIN + 1}); static_assert(add<int>(INT_MIN + 22, -23) == Result<int>{true, INT_MAX}); template <typename RET, typename LHS, typename RHS> constexpr Result<RET> sub(LHS &&lhs, RHS &&rhs) { RET sum{}; return {__builtin_sub_overflow(lhs, rhs, &sum), sum}; } static_assert(sub<unsigned char>(static_cast<char>(0),static_cast<char>(1)) == Result<unsigned char>{true, UCHAR_MAX}); static_assert(sub<char>(static_cast<unsigned char>(0),static_cast<unsigned char>(1)) == Result<char>{false, -1}); static_assert(sub<unsigned short>(static_cast<short>(0),static_cast<short>(1)) == Result<unsigned short>{true, USHRT_MAX}); static_assert(sub<int>(17,22) == Result<int>{false, -5}); static_assert(sub<int>(INT_MAX - 22, -23) == Result<int>{true, INT_MIN}); static_assert(sub<int>(INT_MIN + 22, 23) == Result<int>{true, INT_MAX}); template <typename RET, typename LHS, typename RHS> constexpr Result<RET> mul(LHS &&lhs, RHS &&rhs) { RET sum{}; return {__builtin_mul_overflow(lhs, rhs, &sum), sum}; } static_assert(mul<int>(17,22) == Result<int>{false, 374}); static_assert(mul<int>(INT_MAX / 22, 23) == Result<int>{true, -2049870757}); static_assert(mul<int>(INT_MIN / 22, -23) == Result<int>{true, -2049870757}); constexpr Result<int> sadd(int lhs, int rhs) { int sum{}; return {__builtin_sadd_overflow(lhs, rhs, &sum), sum}; } static_assert(sadd(17,22) == Result<int>{false, 39}); static_assert(sadd(INT_MAX - 22, 23) == Result<int>{true, INT_MIN}); static_assert(sadd(INT_MIN + 22, -23) == Result<int>{true, INT_MAX}); constexpr Result<int> ssub(int lhs, int rhs) { int sum{}; return {__builtin_ssub_overflow(lhs, rhs, &sum), sum}; } static_assert(ssub(17,22) == Result<int>{false, -5}); static_assert(ssub(INT_MAX - 22, -23) == Result<int>{true, INT_MIN}); static_assert(ssub(INT_MIN + 22, 23) == Result<int>{true, INT_MAX}); constexpr Result<int> smul(int lhs, int rhs) { int sum{}; return {__builtin_smul_overflow(lhs, rhs, &sum), sum}; } static_assert(smul(17,22) == Result<int>{false, 374}); static_assert(smul(INT_MAX / 22, 23) == Result<int>{true, -2049870757}); static_assert(smul(INT_MIN / 22, -23) == Result<int>{true, -2049870757}); |