| 1 | #include <stdio.h> |
| 2 | |
| 3 | int overflow_add_32(int x, int y) |
| 4 | { |
| 5 | int res; |
| 6 | return __builtin_add_overflow(x, y, &res); |
| 7 | } |
| 8 | |
| 9 | int overflow_add_64(long long x, long long y) |
| 10 | { |
| 11 | long long res; |
| 12 | return __builtin_add_overflow(x, y, &res); |
| 13 | } |
| 14 | |
| 15 | int overflow_sub_32(int x, int y) |
| 16 | { |
| 17 | int res; |
| 18 | return __builtin_sub_overflow(x, y, &res); |
| 19 | } |
| 20 | |
| 21 | int overflow_sub_64(long long x, long long y) |
| 22 | { |
| 23 | long long res; |
| 24 | return __builtin_sub_overflow(x, y, &res); |
| 25 | } |
| 26 | |
| 27 | int a1_add = -2147483648; |
| 28 | int b1_add = -2147483648; |
| 29 | long long a2_add = -9223372036854775808ULL; |
| 30 | long long b2_add = -9223372036854775808ULL; |
| 31 | |
| 32 | int a1_sub; |
| 33 | int b1_sub = -2147483648; |
| 34 | long long a2_sub = 0L; |
| 35 | long long b2_sub = -9223372036854775808ULL; |
| 36 | |
| 37 | int main() |
| 38 | { |
| 39 | int ret = 0; |
| 40 | |
| 41 | if (!overflow_add_32(a1_add, b1_add)) { |
| 42 | fprintf(stderr, "data overflow while adding 32 bits\n"); |
| 43 | ret = 1; |
| 44 | } |
| 45 | if (!overflow_add_64(a2_add, b2_add)) { |
| 46 | fprintf(stderr, "data overflow while adding 64 bits\n"); |
| 47 | ret = 1; |
| 48 | } |
| 49 | if (!overflow_sub_32(a1_sub, b1_sub)) { |
| 50 | fprintf(stderr, "data overflow while subtracting 32 bits\n"); |
| 51 | ret = 1; |
| 52 | } |
| 53 | if (!overflow_sub_64(a2_sub, b2_sub)) { |
| 54 | fprintf(stderr, "data overflow while subtracting 64 bits\n"); |
| 55 | ret = 1; |
| 56 | } |
| 57 | return ret; |
| 58 | } |