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Update the docs about the fact that the loop vectorizer is enabled by default for -O3.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179060 91177308-0d34-0410-b5e6-96231b3b80d8
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Nadav Rotem
2013-04-08 21:34:49 +00:00
parent 335f1d46d8
commit df4381b578
1 changed files with 4 additions and 9 deletions
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docs/Vectorizers.rst
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@@ -21,19 +21,14 @@ The Loop Vectorizer
Usage Usage
----- -----
LLVM's Loop Vectorizer is now available and will be useful for many people. LLVM's Loop Vectorizer is now enabled by default for -O3.
It is not enabled by default, but can be enabled through clang using the The vectorizer can be disabled using the command line:
command line flag:
.. code-block:: console .. code-block:: console
$ clang -fvectorize -O3 file.c $ clang ... -fno-vectorize file.c
If the ``-fvectorize`` flag is used then the loop vectorizer will be enabled At this point the loop vectorizer is only enabled for -O3, and will not work for -O2 or -Os.
when running with ``-O3``, ``-O2``. When ``-Os`` is used, the loop vectorizer
will only vectorize loops that do not require a major increase in code size.
We plan to enable the Loop Vectorizer by default as part of the LLVM 3.3 release.
Command line flags Command line flags
^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^