[PATCH] D13051: Add placeholder __libcpp_relaxed_store() for when atomic builtins are not available.
Dimitry Andric via cfe-commits
cfe-commits at lists.llvm.org
Tue Sep 22 04:23:39 PDT 2015
dim created this revision.
dim added reviewers: EricWF, mclow.lists.
dim added subscribers: majnemer, jroelofs, cfe-commits.
Herald added a subscriber: aemerson.
In rL241532, atomic_support.h was added, which provides handling of
atomic operations for libc++. When atomic builtins are not available,
it emits a warning about being unsupported, but it still provides a
number of stubs for the required functions.
However, it misses a stub for __libcpp_relaxed_store(). Add it, by
using the same implementation as for __libcpp_atomic_store().
(Note that I encountered this on arm-freebsd, which still defaults to
armv4, and does not have the runtime libcalls to support atomic
builtins. For now, I have simply disabled using them.)
@@ -103,6 +103,13 @@
*__dest = __val;
+template <class _ValueType, class _FromType>
+void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
+ *__dest = __val;
template <class _ValueType>
_ValueType __libcpp_atomic_load(_ValueType const* __val,
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