1 // RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s
2 // expected-no-diagnostics
3
4 #include <limits.h>
5 #include <stdint.h>
6
a()7 int a() {
8 const int x = 3;
9 static int z;
10 constexpr int *y = &z;
11 return []() { return __builtin_sub_overflow((int)x, (int)x, (int *)y); }();
12 }
a2()13 int a2() {
14 const int x = 3;
15 static int z;
16 constexpr int *y = &z;
17 return []() { return __builtin_sub_overflow(x, x, y); }();
18 }
19
20 template<typename T>
21 struct Result {
22 bool B;
23 T Value;
operator ==Result24 constexpr bool operator==(const Result<T> &Other) {
25 return B == Other.B && Value == Other.Value;
26 }
27 };
28
29
30 template <typename RET, typename LHS, typename RHS>
add(LHS && lhs,RHS && rhs)31 constexpr Result<RET> add(LHS &&lhs, RHS &&rhs) {
32 RET sum{};
33 return {__builtin_add_overflow(lhs, rhs, &sum), sum};
34 }
35
36 static_assert(add<short>(static_cast<char>(120), static_cast<char>(10)) == Result<short>{false, 130});
37 static_assert(add<char>(static_cast<short>(120), static_cast<short>(10)) == Result<char>{true, -126});
38 static_assert(add<unsigned int>(INT_MAX, INT_MAX) == Result<unsigned int>{false, static_cast<unsigned int>(INT_MAX) * 2u});
39 static_assert(add<int>(static_cast<unsigned int>(INT_MAX), 1u) == Result<int>{true, INT_MIN});
40
41 static_assert(add<int>(17, 22) == Result<int>{false, 39});
42 static_assert(add<int>(INT_MAX - 22, 24) == Result<int>{true, INT_MIN + 1});
43 static_assert(add<int>(INT_MIN + 22, -23) == Result<int>{true, INT_MAX});
44
45 template <typename RET, typename LHS, typename RHS>
sub(LHS && lhs,RHS && rhs)46 constexpr Result<RET> sub(LHS &&lhs, RHS &&rhs) {
47 RET sum{};
48 return {__builtin_sub_overflow(lhs, rhs, &sum), sum};
49 }
50
51 static_assert(sub<unsigned char>(static_cast<char>(0),static_cast<char>(1)) == Result<unsigned char>{true, UCHAR_MAX});
52 static_assert(sub<char>(static_cast<unsigned char>(0),static_cast<unsigned char>(1)) == Result<char>{false, -1});
53 static_assert(sub<unsigned short>(static_cast<short>(0),static_cast<short>(1)) == Result<unsigned short>{true, USHRT_MAX});
54 static_assert(sub<uint8_t>(static_cast<uint8_t>(255),static_cast<int>(100)) == Result<uint8_t>{false, 155});
55
56 static_assert(sub<int>(17,22) == Result<int>{false, -5});
57 static_assert(sub<int>(INT_MAX - 22, -23) == Result<int>{true, INT_MIN});
58 static_assert(sub<int>(INT_MIN + 22, 23) == Result<int>{true, INT_MAX});
59
60 template <typename RET, typename LHS, typename RHS>
mul(LHS && lhs,RHS && rhs)61 constexpr Result<RET> mul(LHS &&lhs, RHS &&rhs) {
62 RET sum{};
63 return {__builtin_mul_overflow(lhs, rhs, &sum), sum};
64 }
65
66 static_assert(mul<int>(17,22) == Result<int>{false, 374});
67 static_assert(mul<int>(INT_MAX / 22, 23) == Result<int>{true, -2049870757});
68 static_assert(mul<int>(INT_MIN / 22, -23) == Result<int>{true, -2049870757});
69
sadd(int lhs,int rhs)70 constexpr Result<int> sadd(int lhs, int rhs) {
71 int sum{};
72 return {__builtin_sadd_overflow(lhs, rhs, &sum), sum};
73 }
74
75 static_assert(sadd(17,22) == Result<int>{false, 39});
76 static_assert(sadd(INT_MAX - 22, 23) == Result<int>{true, INT_MIN});
77 static_assert(sadd(INT_MIN + 22, -23) == Result<int>{true, INT_MAX});
78
ssub(int lhs,int rhs)79 constexpr Result<int> ssub(int lhs, int rhs) {
80 int sum{};
81 return {__builtin_ssub_overflow(lhs, rhs, &sum), sum};
82 }
83
84 static_assert(ssub(17,22) == Result<int>{false, -5});
85 static_assert(ssub(INT_MAX - 22, -23) == Result<int>{true, INT_MIN});
86 static_assert(ssub(INT_MIN + 22, 23) == Result<int>{true, INT_MAX});
87
smul(int lhs,int rhs)88 constexpr Result<int> smul(int lhs, int rhs) {
89 int sum{};
90 return {__builtin_smul_overflow(lhs, rhs, &sum), sum};
91 }
92
93 static_assert(smul(17,22) == Result<int>{false, 374});
94 static_assert(smul(INT_MAX / 22, 23) == Result<int>{true, -2049870757});
95 static_assert(smul(INT_MIN / 22, -23) == Result<int>{true, -2049870757});
96
97