gcc/testsuite/gcc.dg/pr102207.c


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/* PR tree-optimization/102207 */
/* { dg-do run { target int128 } } */
/* { dg-options "-O2" } */

typedef unsigned __int128 u128;

u128
foo (unsigned short a)
{
  u128 g;
  __builtin_sub_overflow ((unsigned long long) -a, 1, &g);
  return g;
}

int
main ()
{
  if (__SIZEOF_LONG_LONG__ * __CHAR_BIT__ != 64
      || __SIZEOF_SHORT__ * __CHAR_BIT__ != 16)
    return 0;
  if (foo (1) != 0xfffffffffffffffeULL)
    __builtin_abort ();
  return 0;
}