| // RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s |
| // RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s -fexperimental-new-constant-interpreter |
| // expected-no-diagnostics |
| |
| #include <limits.h> |
| #include <stdint.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<uint8_t>(static_cast<uint8_t>(255),static_cast<int>(100)) == Result<uint8_t>{false, 155}); |
| |
| 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}); |
| |
| template<typename T> |
| struct CarryResult { |
| T CarryOut; |
| T Value; |
| constexpr bool operator==(const CarryResult<T> &Other) { |
| return CarryOut == Other.CarryOut && Value == Other.Value; |
| } |
| }; |
| |
| constexpr CarryResult<unsigned char> addcb(unsigned char lhs, unsigned char rhs, unsigned char carry) { |
| unsigned char carry_out{}; |
| unsigned char sum{}; |
| sum = __builtin_addcb(lhs, rhs, carry, &carry_out); |
| return {carry_out, sum}; |
| } |
| |
| static_assert(addcb(120, 10, 0) == CarryResult<unsigned char>{0, 130}); |
| static_assert(addcb(250, 10, 0) == CarryResult<unsigned char>{1, 4}); |
| static_assert(addcb(255, 255, 0) == CarryResult<unsigned char>{1, 254}); |
| static_assert(addcb(255, 255, 1) == CarryResult<unsigned char>{1, 255}); |
| static_assert(addcb(255, 0, 1) == CarryResult<unsigned char>{1, 0}); |
| static_assert(addcb(255, 1, 0) == CarryResult<unsigned char>{1, 0}); |
| static_assert(addcb(255, 1, 1) == CarryResult<unsigned char>{1, 1}); |
| // This is currently supported with the carry still producing a value of 1. |
| // If support for carry outside of 0-1 is removed, change this test to check |
| // that it is not supported. |
| static_assert(addcb(255, 255, 2) == CarryResult<unsigned char>{1, 0}); |
| |
| constexpr CarryResult<unsigned char> subcb(unsigned char lhs, unsigned char rhs, unsigned char carry) { |
| unsigned char carry_out{}; |
| unsigned char sum{}; |
| sum = __builtin_subcb(lhs, rhs, carry, &carry_out); |
| return {carry_out, sum}; |
| } |
| |
| static_assert(subcb(20, 10, 0) == CarryResult<unsigned char>{0, 10}); |
| static_assert(subcb(10, 10, 0) == CarryResult<unsigned char>{0, 0}); |
| static_assert(subcb(10, 15, 0) == CarryResult<unsigned char>{1, 251}); |
| // The carry is subtracted from the result |
| static_assert(subcb(10, 15, 1) == CarryResult<unsigned char>{1, 250}); |
| static_assert(subcb(0, 0, 1) == CarryResult<unsigned char>{1, 255}); |
| static_assert(subcb(0, 1, 0) == CarryResult<unsigned char>{1, 255}); |
| static_assert(subcb(0, 1, 1) == CarryResult<unsigned char>{1, 254}); |
| static_assert(subcb(0, 255, 0) == CarryResult<unsigned char>{1, 1}); |
| static_assert(subcb(0, 255, 1) == CarryResult<unsigned char>{1, 0}); |
| // This is currently supported with the carry still producing a value of 1. |
| // If support for carry outside of 0-1 is removed, change this test to check |
| // that it is not supported. |
| static_assert(subcb(0, 255, 2) == CarryResult<unsigned char>{1, 255}); |