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| author | Tim Northover <t.p.northover@gmail.com> | 2013-05-23 19:11:20 +0000 |
|---|---|---|
| committer | Tim Northover <t.p.northover@gmail.com> | 2013-05-23 19:11:20 +0000 |
| commit | 5a02fc4b5fa0eba4d0875db710400a74ada3b15f (patch) | |
| tree | 7539b039c2bbfb51e11f188aecf72fd6c0a71b57 /docs | |
| parent | b94a353242b26af5c0969926a6b84664e342b586 (diff) | |
| download | llvm-5a02fc4b5fa0eba4d0875db710400a74ada3b15f.tar.gz llvm-5a02fc4b5fa0eba4d0875db710400a74ada3b15f.tar.bz2 llvm-5a02fc4b5fa0eba4d0875db710400a74ada3b15f.tar.xz | |
ARM: implement @llvm.readcyclecounter intrinsic
This implements the @llvm.readcyclecounter intrinsic as the specific
MRC instruction specified in the ARM manuals for CPUs with the Power
Management extensions.
Older CPUs had slightly different methods which may also have to be
implemented eventually, but this should cover all v7 cases.
rdar://problem/13939186
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182603 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 4eecd15a6f..5e32eba7f7 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -6663,6 +6663,9 @@ memory. Implementations are allowed to either return a application specific value or a system wide value. On backends without support, this is lowered to a constant 0. +Note that runtime support may be conditional on the privilege-level code is +running at and the host platform. + Standard C Library Intrinsics ----------------------------- |