[llvm] r179511 - Document our desire to enable the loop vectorizer on -Os in future releases.

Chandler Carruth chandlerc at google.com
Mon Apr 15 01:33:26 PDT 2013


On Sun, Apr 14, 2013 at 10:56 PM, Nadav Rotem <nrotem at apple.com> wrote:

> Author: nadav
> Date: Mon Apr 15 00:56:55 2013
> New Revision: 179511
>
> URL: http://llvm.org/viewvc/llvm-project?rev=179511&view=rev
> Log:
> Document our desire to enable the loop vectorizer on -Os in future
> releases.
>

Perhaps I've missed it, but is there somewhere a discussion of this? For
example, why, what the requirements are, what is being measured?


>
> Modified:
>     llvm/trunk/docs/Vectorizers.rst
>
> Modified: llvm/trunk/docs/Vectorizers.rst
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/Vectorizers.rst?rev=179511&r1=179510&r2=179511&view=diff
>
> ==============================================================================
> --- llvm/trunk/docs/Vectorizers.rst (original)
> +++ llvm/trunk/docs/Vectorizers.rst Mon Apr 15 00:56:55 2013
> @@ -22,6 +22,7 @@ Usage
>  -----
>
>  LLVM's Loop Vectorizer is now enabled by default for -O3.
> +We plan to enable parts of the Loop Vectorizer on -O2 and -Os in future
> releases.
>  The vectorizer can be disabled using the command line:
>
>  .. code-block:: console
>
>
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