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Docs: dampen story time for atomics 

Story time was nice a few years ago, but by now it's nice to state how things are, rather than explain the diff from ye olden atomic history. These were dark times.

llvm-svn: 265369
This commit is contained in:
JF Bastien 2016-04-05 00:31:25 +00:00
parent 1c3c223b65
commit 86d8d87640
1 changed files with 3 additions and 7 deletions
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10
llvm/docs/Atomics.rst
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@ -8,17 +8,13 @@ LLVM Atomic Instructions and Concurrency Guide
Introduction
============
Historically, LLVM has not had very strong support for concurrency; some minimal
intrinsics were provided, and ``volatile`` was used in some cases to achieve
rough semantics in the presence of concurrency. However, this is changing;
there are now new instructions which are well-defined in the presence of threads
and asynchronous signals, and the model for existing instructions has been
clarified in the IR.
LLVM supports instructions which are well-defined in the presence of threads and
asynchronous signals.
The atomic instructions are designed specifically to provide readable IR and
optimized code generation for the following:
* The new C++11 ``<atomic>`` header. (`C++11 draft available here
* The C++11 ``<atomic>`` header. (`C++11 draft available here
<http://www.open-std.org/jtc1/sc22/wg21/>`_.) (`C11 draft available here
<http://www.open-std.org/jtc1/sc22/wg14/>`_.)