gcc/testsuite/c-c++-common/ubsan/overflow-sub-3.c

/* { dg-do run } */
/* { dg-options "-fsanitize=signed-integer-overflow" } */

__attribute__((noinline, noclone)) int
foo1 (int x, int y)
{
  return x - y;
}

__attribute__((noinline, noclone)) int
foo2 (int x, int y)
{
  unsigned int xa = (unsigned int) x - (__INT_MAX__ - 3);
  xa &= 3;
  x = __INT_MAX__ - 3 + xa;
  unsigned int ya = y + 1U;
  ya &= 1;
  y = ya - 1;
  return x - y;
}

int
main ()
{
  int xm1, y;
  for (xm1 = __INT_MAX__ - 4; xm1 < __INT_MAX__; xm1++)
    for (y = -1; y <= 0; y++)
      if (foo1 (xm1 + 1, y) != (int) (xm1 + 1U - y)
	  || foo2 (xm1 + 1, y) != (int) (xm1 + 1U - y))
	__builtin_abort ();
  return 0;
}
/* { dg-output ":7:\[0-9]\[^\n\r]*signed integer overflow: 2147483647 - -1 cannot be represented in type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
/* { dg-output "\[^\n\r]*:19:\[0-9]\[^\n\r]*signed integer overflow: 2147483647 - -1 cannot be represented in type 'int'" } */