gcc/testsuite/gcc.dg/pr95694.c

   1 /* PR tree-optimization/68835 */
   2 /* { dg-do run { target int128 } } */
   3 /* { dg-options "-fno-tree-forwprop -fno-tree-ccp -O1 -fno-tree-dominator-opts -fno-tree-fre" } */
   4
   5 __attribute__((noinline, noclone)) unsigned __int128
   6 foo (void)
   7 {
   8   unsigned __int128 x = (unsigned __int128) 0xffffffffffffffffULL;
   9   struct { unsigned __int128 a : 65; } w;
  10   w.a = x;
  11   w.a += x;
  12   return w.a;
  13 }
  14
  15 int
  16 main ()
  17 {
  18   unsigned __int128 x = foo ();
  19   if ((unsigned long long) x != 0xfffffffffffffffeULL
  20       || (unsigned long long) (x >> 64) != 1)
  21     __builtin_abort ();
  22   return 0;
  23 }