147 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s2// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s -fexperimental-new-constant-interpreter3// expected-no-diagnostics4 5#include <limits.h>6#include <stdint.h>7 8int a() {9 const int x = 3;10 static int z;11 constexpr int *y = &z;12 return []() { return __builtin_sub_overflow((int)x, (int)x, (int *)y); }();13}14int a2() {15 const int x = 3;16 static int z;17 constexpr int *y = &z;18 return []() { return __builtin_sub_overflow(x, x, y); }();19}20 21template<typename T>22struct Result {23 bool B;24 T Value;25 constexpr bool operator==(const Result<T> &Other) {26 return B == Other.B && Value == Other.Value;27 }28};29 30 31template <typename RET, typename LHS, typename RHS>32constexpr Result<RET> add(LHS &&lhs, RHS &&rhs) {33 RET sum{};34 return {__builtin_add_overflow(lhs, rhs, &sum), sum};35}36 37static_assert(add<short>(static_cast<char>(120), static_cast<char>(10)) == Result<short>{false, 130});38static_assert(add<char>(static_cast<short>(120), static_cast<short>(10)) == Result<char>{true, -126});39static_assert(add<unsigned int>(INT_MAX, INT_MAX) == Result<unsigned int>{false, static_cast<unsigned int>(INT_MAX) * 2u});40static_assert(add<int>(static_cast<unsigned int>(INT_MAX), 1u) == Result<int>{true, INT_MIN});41 42static_assert(add<int>(17, 22) == Result<int>{false, 39});43static_assert(add<int>(INT_MAX - 22, 24) == Result<int>{true, INT_MIN + 1});44static_assert(add<int>(INT_MIN + 22, -23) == Result<int>{true, INT_MAX});45 46template <typename RET, typename LHS, typename RHS>47constexpr Result<RET> sub(LHS &&lhs, RHS &&rhs) {48 RET sum{};49 return {__builtin_sub_overflow(lhs, rhs, &sum), sum};50}51 52static_assert(sub<unsigned char>(static_cast<char>(0),static_cast<char>(1)) == Result<unsigned char>{true, UCHAR_MAX});53static_assert(sub<char>(static_cast<unsigned char>(0),static_cast<unsigned char>(1)) == Result<char>{false, -1});54static_assert(sub<unsigned short>(static_cast<short>(0),static_cast<short>(1)) == Result<unsigned short>{true, USHRT_MAX});55static_assert(sub<uint8_t>(static_cast<uint8_t>(255),static_cast<int>(100)) == Result<uint8_t>{false, 155});56 57static_assert(sub<int>(17,22) == Result<int>{false, -5});58static_assert(sub<int>(INT_MAX - 22, -23) == Result<int>{true, INT_MIN});59static_assert(sub<int>(INT_MIN + 22, 23) == Result<int>{true, INT_MAX});60 61template <typename RET, typename LHS, typename RHS>62constexpr Result<RET> mul(LHS &&lhs, RHS &&rhs) {63 RET sum{};64 return {__builtin_mul_overflow(lhs, rhs, &sum), sum};65}66 67static_assert(mul<int>(17,22) == Result<int>{false, 374});68static_assert(mul<int>(INT_MAX / 22, 23) == Result<int>{true, -2049870757});69static_assert(mul<int>(INT_MIN / 22, -23) == Result<int>{true, -2049870757});70 71constexpr Result<int> sadd(int lhs, int rhs) {72 int sum{};73 return {__builtin_sadd_overflow(lhs, rhs, &sum), sum};74}75 76static_assert(sadd(17,22) == Result<int>{false, 39});77static_assert(sadd(INT_MAX - 22, 23) == Result<int>{true, INT_MIN});78static_assert(sadd(INT_MIN + 22, -23) == Result<int>{true, INT_MAX});79 80constexpr Result<int> ssub(int lhs, int rhs) {81 int sum{};82 return {__builtin_ssub_overflow(lhs, rhs, &sum), sum};83}84 85static_assert(ssub(17,22) == Result<int>{false, -5});86static_assert(ssub(INT_MAX - 22, -23) == Result<int>{true, INT_MIN});87static_assert(ssub(INT_MIN + 22, 23) == Result<int>{true, INT_MAX});88 89constexpr Result<int> smul(int lhs, int rhs) {90 int sum{};91 return {__builtin_smul_overflow(lhs, rhs, &sum), sum};92}93 94static_assert(smul(17,22) == Result<int>{false, 374});95static_assert(smul(INT_MAX / 22, 23) == Result<int>{true, -2049870757});96static_assert(smul(INT_MIN / 22, -23) == Result<int>{true, -2049870757});97 98template<typename T>99struct CarryResult {100 T CarryOut;101 T Value;102 constexpr bool operator==(const CarryResult<T> &Other) {103 return CarryOut == Other.CarryOut && Value == Other.Value;104 }105};106 107constexpr CarryResult<unsigned char> addcb(unsigned char lhs, unsigned char rhs, unsigned char carry) {108 unsigned char carry_out{};109 unsigned char sum{};110 sum = __builtin_addcb(lhs, rhs, carry, &carry_out);111 return {carry_out, sum};112}113 114static_assert(addcb(120, 10, 0) == CarryResult<unsigned char>{0, 130});115static_assert(addcb(250, 10, 0) == CarryResult<unsigned char>{1, 4});116static_assert(addcb(255, 255, 0) == CarryResult<unsigned char>{1, 254});117static_assert(addcb(255, 255, 1) == CarryResult<unsigned char>{1, 255});118static_assert(addcb(255, 0, 1) == CarryResult<unsigned char>{1, 0});119static_assert(addcb(255, 1, 0) == CarryResult<unsigned char>{1, 0});120static_assert(addcb(255, 1, 1) == CarryResult<unsigned char>{1, 1});121// This is currently supported with the carry still producing a value of 1.122// If support for carry outside of 0-1 is removed, change this test to check123// that it is not supported.124static_assert(addcb(255, 255, 2) == CarryResult<unsigned char>{1, 0});125 126constexpr CarryResult<unsigned char> subcb(unsigned char lhs, unsigned char rhs, unsigned char carry) {127 unsigned char carry_out{};128 unsigned char sum{};129 sum = __builtin_subcb(lhs, rhs, carry, &carry_out);130 return {carry_out, sum};131}132 133static_assert(subcb(20, 10, 0) == CarryResult<unsigned char>{0, 10});134static_assert(subcb(10, 10, 0) == CarryResult<unsigned char>{0, 0});135static_assert(subcb(10, 15, 0) == CarryResult<unsigned char>{1, 251});136// The carry is subtracted from the result137static_assert(subcb(10, 15, 1) == CarryResult<unsigned char>{1, 250});138static_assert(subcb(0, 0, 1) == CarryResult<unsigned char>{1, 255});139static_assert(subcb(0, 1, 0) == CarryResult<unsigned char>{1, 255});140static_assert(subcb(0, 1, 1) == CarryResult<unsigned char>{1, 254});141static_assert(subcb(0, 255, 0) == CarryResult<unsigned char>{1, 1});142static_assert(subcb(0, 255, 1) == CarryResult<unsigned char>{1, 0});143// This is currently supported with the carry still producing a value of 1.144// If support for carry outside of 0-1 is removed, change this test to check145// that it is not supported.146static_assert(subcb(0, 255, 2) == CarryResult<unsigned char>{1, 255});147