Memory fences are not handled by the NVPTX backend. We need to replace
them with a memory barrier intrinsic function. This doesn't include the
ordering, but should perform the necessary functionality, albeit slower.
Reviewed By: tianshilei1992
Differential Revision: https://reviews.llvm.org/D146725
#define LLVM_LIBC_SRC_SUPPORT_CPP_ATOMIC_H
#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/properties/architectures.h"
#include "type_traits.h"
// Issue a thread fence with the given memory ordering.
LIBC_INLINE void atomic_thread_fence(MemoryOrder mem_ord) {
+// The NVPTX backend currently does not support atomic thread fences so we use a
+// full system fence instead.
+#ifdef LIBC_TARGET_ARCH_IS_NVPTX
+ (void)mem_ord;
+ __nvvm_membar_sys();
+#else
__atomic_thread_fence(int(mem_ord));
+#endif
}
} // namespace cpp