diff options
| author | Yi Kong <Yi.Kong@arm.com> | 2014-07-23 09:25:02 +0000 |
|---|---|---|
| committer | Yi Kong <Yi.Kong@arm.com> | 2014-07-23 09:25:02 +0000 |
| commit | 4de26fb2e005bbc008be93846e0e05e595342797 (patch) | |
| tree | db882e965d7e63435f152ae171d7cedf388652c7 | |
| parent | 30253f3247236ec15c87f7aab4f6cb97aef2dc1e (diff) | |
| download | bcm5719-llvm-4de26fb2e005bbc008be93846e0e05e595342797.tar.gz bcm5719-llvm-4de26fb2e005bbc008be93846e0e05e595342797.zip | |
ARM: Add doc for ACLE memory barrier intrinsics
Add documentations for ACLE memory barrier intrinsics, describing their motion
barrier characteristics.
llvm-svn: 213733
| -rw-r--r-- | clang/docs/LanguageExtensions.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst index 4c600868e9e..50e1ccebe87 100644 --- a/clang/docs/LanguageExtensions.rst +++ b/clang/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 ------------------------------ |
