kit

kit
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builtin_09_atomic_exchange_n.c (203B)

      1 int test_main(void) {
      2   int x = 30;
      3   int prior = __atomic_exchange_n(&x, 99, __ATOMIC_SEQ_CST);
      4   /* prior was 30, x is now 99; result is prior + (x - 99) + 12 = 42 */
      5   return prior + (x - 99) + 12;
      6 }