1  /* { dg-do compile } */
       2  /* { dg-options "-O2" } */
       3  
       4  #include <stdatomic.h>
       5  #include <stdbool.h>
       6  
       7  bool
       8  foo (_Atomic int *v, int bit)
       9  {
      10    int mask = 1 << bit;
      11    return atomic_fetch_and_explicit (v, ~mask, memory_order_relaxed) & mask;
      12  }
      13  
      14  /* { dg-final { scan-assembler-times "lock;?\[ \t\]*btrl" 1 } } */
      15  /* { dg-final { scan-assembler-not "cmpxchg" } } */