From: Yi Kong Date: Wed, 23 Jul 2014 09:25:02 +0000 (+0000) Subject: ARM: Add doc for ACLE memory barrier intrinsics X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=25c5dd2c9024288df0509ca59c6c1068c6e62566;p=clang ARM: Add doc for ACLE memory barrier intrinsics Add documentations for ACLE memory barrier intrinsics, describing their motion barrier characteristics. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213733 91177308-0d34-0410-b5e6-96231b3b80d8 --- 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 +`_. +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 ------------------------------