Re: [PATCH, aarch64] Add prefetch support

[Andrew Pinski <pinskia@gmail.com>]

On Tue, Jan 13, 2015 at 6:13 AM, Marcus Shawcroft
<marcus.shawcroft@gmail.com> wrote:
> On 11 January 2015 at 02:37, Andrew Pinski <pinskia@gmail.com> wrote:
>> On Tue, Nov 11, 2014 at 6:47 AM, Marcus Shawcroft
>> <marcus.shawcroft@gmail.com> wrote:
>>> On 30 October 2014 08:54, Gopalasubramanian, Ganesh
>>> <Ganesh.Gopalasubramanian@amd.com> wrote:
>>>
>>>> 2014-10-30  Ganesh Gopalasubramanian <Ganesh.Gopalasubramanian@amd.com>
>>>
>>> Check the whitespace in your ChangeLog line.
>>>
>>>>         * config/arm/types.md (define_attr "type"): Add prefetch.
>>>
>>> The existing schedulers use 'load1'.  We can of course split that into
>>> two introducing "prefetch" and update all of the existing schedulers
>>> to reflect the change.  However I suggest we do that as a separate
>>> activity when someone actually needs the distinction, note this change
>>> will require updating the schedulers for both ARM and AArch64 backends
>>> not just those relevant to AArch64.  For this prefetch patch I suggest
>>> we go with the existing "load1".
>>
>> I will need this change for ThunderX schedule.  The Pref instruction
>> is single issued while load1 can be dual issued.
>
> Hi
>
> https://gcc.gnu.org/ml/gcc-patches/2015-01/msg00802.html
>
> Philipp when you deal with Ramana's request above to split
> load1->load1/prefetch in the existing schedulers I suggest you also
> split it in aarch64/thunderx.md in order to retain existing behaviour.
> Andrew can then follow up add the "right" behaviour when he is ready.
> Andrew OK ?

Yes that sounds ok to me.  I was going to submit an update to
thunderx.md file this week anyways.

Thanks,
Andrew


>
> Cheers
> /Marcus