Re: [PATCH, aarch64] Add prefetch support

[Marcus Shawcroft <marcus.shawcroft@gmail.com>]

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 ?

Cheers
/Marcus