Re: GCC 4.7.0 Status Report (2011-10-27), Stage 1 will end Nov 7th

[Michael Zolotukhin <michael.v.zolotukhin@gmail.com>]

Hello!

x86-specific part of this patch was committed to the trunk recently.
There is also target-independent part, which covers memset/memcopy for
the smallest sizes (from 1 to ~256 bytes). In contrast to existing
implementation, it has a cost model to choose the fastest move-mode
(which could be a vector move-mode). This helps to increase the
performance on small sizes - these cases are especially important,
because libcalls can't be efficiently used here due to call overheads.

Could anyone from middle-end maintainers review it, when I updated it
to the latest changes?

Thanks!

On 27 October 2011 17:24, Uros Bizjak <ubizjak@gmail.com> wrote:
> Hello!
>
>> The GCC trunk is still in stage1.  Stage1 will last until
>> Nov 7th (including, use your timezone to your advantage) after
>> which we will have been in stage1 for nearth 8 months.
>> In stage3 the trunk will be open for general bugfixing, no
>> new features will be accepted.
>
> There is a patch that implements usage of vector instructions in
> memmov/memset expanding [1]. The patch was not reviewed for quite some
> time, but IIRC, we said that patches that were submitted before Stage
> 1 closes are still eligible for later stages (after a review of
> course).
>
> I think that this feature certainly improves gcc (also taking into
> account recent glibc changes in this area), and IMO implements an
> important feature for recent processors. I would like to motivate
> middle-end and target maintainers to consider the patch for a review
> before stage 1 closes, and ultimately ask Release Managers to decide
> how to proceed with this patch.
>
> [1] http://gcc.gnu.org/ml/gcc-patches/2011-10/msg02392.html
>
> Thanks,
> Uros.
>



-- 
---
Best regards,
Michael V. Zolotukhin,
Software Engineer
Intel Corporation.