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| -rw-r--r-- | docs/LanguageExtensions.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst index 4c600868e9..50e1ccebe8 100644 --- a/docs/LanguageExtensions.rst +++ b/docs/LanguageExtensions.rst @@ -1634,6 +1634,19 @@ Target-Specific Extensions Clang supports some language features conditionally on some targets. +ARM/AArch64 Language Extensions +------------------------------- + +Memory Barrier Intrinsics +^^^^^^^^^^^^^^^^^^^^^^^^^ +Clang implements the ``__dmb``, ``__dsb`` and ``__isb`` intrinsics as defined +in the `ARM C Language Extensions Release 2.0 +<http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf>`_. +Note that these intrinsics are implemented as motion barriers that block +reordering of memory accesses and side effect instructions. Other instructions +like simple arithmatic may be reordered around the intrinsic. If you expect to +have no reordering at all, use inline assembly instead. + X86/X86-64 Language Extensions ------------------------------ |