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Re: ARM/getting rid of superfluous zero extension


On Thu, Oct 4, 2012 at 2:18 PM, Eric Botcazou <ebotcazou@adacore.com> wrote:
>> Any suggestion about how I could avoid generating this zero_extension?
>
> Redundant extensions have been a hot topic for some time.  The combiner should
> catch the local easy cases, we have ree.c for the nonlocal easy cases and Tom
> recently posted:
>   http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00408.html
> which should catch more complex cases.
>
> I guess someone should gather the various missed optimization cases, draw a
> global picture of the situation and see how the various approaches could be
> fitted together.

Kenny already did that as part of the thread with Tom.  Tom's patch
also is incomplete.

- David


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