diff options
| author | Yi Kong <Yi.Kong@arm.com> | 2014-07-23 19:55:09 +0000 |
|---|---|---|
| committer | Yi Kong <Yi.Kong@arm.com> | 2014-07-23 19:55:09 +0000 |
| commit | 2cabf384c2f0e38f274a56fae7c5e7469a504cad (patch) | |
| tree | ed9aadb9bcff37d5292948e90691e91d6b006158 /clang | |
| parent | a0911d3f036878cdfabf59e6d448749c0a126994 (diff) | |
| download | llvm-2cabf384c2f0e38f274a56fae7c5e7469a504cad.zip llvm-2cabf384c2f0e38f274a56fae7c5e7469a504cad.tar.gz llvm-2cabf384c2f0e38f274a56fae7c5e7469a504cad.tar.bz2 | |
Merging r213733:
------------------------------------------------------------------------
r213733 | kongyi | 2014-07-23 10:25:02 +0100 (Wed, 23 Jul 2014) | 5 lines
ARM: Add doc for ACLE memory barrier intrinsics
Add documentations for ACLE memory barrier intrinsics, describing their motion
barrier characteristics.
------------------------------------------------------------------------
llvm-svn: 213787
Diffstat (limited to 'clang')
| -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 4c60086..50e1cce 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 ------------------------------ |