kit

kit
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builtin_10_atomic_fetch_sub.c (160B)

      1 int test_main(void) {
      2   int x = 50;
      3   int prior = __atomic_fetch_sub(&x, 8, __ATOMIC_ACQ_REL);
      4   /* prior=50, x=42 -> result 42 */
      5   return x + (prior - 50);
      6 }