1 #include <stdio.h>
2
overflow_add_32(int x,int y)3 int overflow_add_32(int x, int y)
4 {
5 int res;
6 return __builtin_add_overflow(x, y, &res);
7 }
8
overflow_add_64(long long x,long long y)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
overflow_sub_32(int x,int y)15 int overflow_sub_32(int x, int y)
16 {
17 int res;
18 return __builtin_sub_overflow(x, y, &res);
19 }
20
overflow_sub_64(long long x,long long y)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
main()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 }
59