15 #include "llvm/Config/llvm-config.h"
25 #if defined(__GNUC__) || (defined(__IBMCPP__) && __IBMCPP__ >= 1210)
30 #if LLVM_HAS_ATOMICS == 0
33 # if defined(GNU_ATOMICS)
35 # elif defined(_MSC_VER)
38 # error No memory fence implementation for your platform!
46 #if LLVM_HAS_ATOMICS == 0
48 if (result == old_value)
51 #elif defined(GNU_ATOMICS)
52 return __sync_val_compare_and_swap(ptr, old_value, new_value);
53 #elif defined(_MSC_VER)
54 return InterlockedCompareExchange(ptr, new_value, old_value);
56 # error No compare-and-swap implementation for your platform!
cas_flag CompareAndSwap(volatile cas_flag *ptr, cas_flag new_value, cas_flag old_value)