gcc/testsuite/gcc.dg/pr102207.c

   1 /* PR tree-optimization/102207 */
   2 /* { dg-do run { target int128 } } */
   3 /* { dg-options "-O2" } */
   4
   5 typedef unsigned __int128 u128;
   6
   7 u128
   8 foo (unsigned short a)
   9 {
  10   u128 g;
  11   __builtin_sub_overflow ((unsigned long long) -a, 1, &g);
  12   return g;
  13 }
  14
  15 int
  16 main ()
  17 {
  18   if (__SIZEOF_LONG_LONG__ * __CHAR_BIT__ != 64
  19       || __SIZEOF_SHORT__ * __CHAR_BIT__ != 16)
  20     return 0;
  21   if (foo (1) != 0xfffffffffffffffeULL)
  22     __builtin_abort ();
  23   return 0;
  24 }