[Bug target/83008] [performance] Is it better to avoid extra instructions in data passing between loops?

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83008

--- Comment #32 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 26 Jan 2018, sergey.shalnov at intel dot com wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83008
> 
> --- Comment #31 from sergey.shalnov at intel dot com ---
> Richard,
> Thank you for your latest patch. This patch is exactly that 
> I’ve discussed in this issue request.
> I tested it with SPEC20[06|17] and see no performance/stability degradation.
> 
> Could you please merge your latest patch into main trunk?

Is this bug a regression?  If not I think the change has to wait for
GCC 9.

> I will provide Intel specific changes (in gcc/config/i386) that 
> will leverage your patch to get the performance better 
> for the provided testcase (step N2)

Can you attach those?