[PATCHv3] powerpc: Replace lxvd2x/stxvd2x with lvx/stvx in P7's memcpy/memmove

[Florian Weimer]

On 10/20/2017 09:22 PM, Tulio Magno Quites Machado Filho wrote:
> From: Rajalakshmi Srinivasaraghavan<raji@linux.vnet.ibm.com>
> 
> POWER9 DD2.1 and earlier has an issue where some cache inhibited
> vector load traps to the kernel, causing a performance degradation.  To
> handle this in memcpy and memmove, lvx/stvx is used for aligned
> addresses instead of lxvd2x/stxvd2x.
> 
> Reference:https://patchwork.ozlabs.org/patch/814059/
> 
> 2017-10-20  Rajalakshmi Srinivasaraghavan<raji@linux.vnet.ibm.com>
> 
> 	* sysdeps/powerpc/powerpc64/power7/memcpy.S: Replace
> 	lxvd2x/stxvd2x with lvx/stvx.
> 	* sysdeps/powerpc/powerpc64/power7/memmove.S: Likewise.
> 
> Reviewed-by: Tulio Magno Quites Machado Filho<tuliom@linux.vnet.ibm.com>

Should we backport this change, to 2.26 in particular?

Thanks,
Florian