[atomic] Remove IBM/AIX implementation
The C++11 implementation shall be enough for everyone.
diff --git a/src/hb-atomic.hh b/src/hb-atomic.hh
index 47b8d27..93265f6 100644
--- a/src/hb-atomic.hh
+++ b/src/hb-atomic.hh
@@ -73,6 +73,7 @@
}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
+
#elif !defined(HB_NO_MT)
/* C++11 atomics. */
@@ -101,33 +102,6 @@
#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
-#elif !defined(HB_NO_MT) && defined(_AIX) && (defined(__IBMCPP__) || defined(__ibmxl__))
-
-#include <builtins.h>
-
-#define _hb_memory_barrier() __lwsync ()
-
-static inline int _hb_fetch_and_add (int *AI, int V)
-{
- _hb_memory_barrier ();
- int result = __fetch_and_add (AI, V);
- _hb_memory_barrier ();
- return result;
-}
-static inline bool _hb_compare_and_swaplp (long *P, long O, long N)
-{
- _hb_memory_barrier ();
- bool result = __compare_and_swaplp (P, &O, N);
- _hb_memory_barrier ();
- return result;
-}
-
-#define hb_atomic_int_impl_add(AI, V) _hb_fetch_and_add ((AI), (V))
-
-#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_compare_and_swaplp ((long *) (P), (long) (O), (long) (N))
-static_assert ((sizeof (long) == sizeof (void *)), "");
-
-
#elif defined(HB_NO_MT)
#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
