tests/tcg/multiarch/overflow.c

   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 }