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Re: [PATCH][AArch64] Add support for -mcpu=cortex-a72

On Wed, Feb 4, 2015 at 12:57 PM, Marcus Shawcroft
<> wrote:
> On 4 February 2015 at 10:35, Matthew Wahab <> wrote:
>> Hello,
>> The Cortex-A72 is an ARMv8 core with the same architectural features as the
>> Cortex-A57. This patch adds support for the command line option
>> -mcpu=cortex-a72 with the same effect as the -mcpu=cortex-a57 option, only
>> the name being different. It also adds support for the
>> -mcpu=cortex-a72.cortex-a53 big-little variant.
>> Tested with check-gcc on aarch64-none-linux-gnu with no new failures. Tested
>> the new cpu options from the command line.
>> Matthew
>> gcc/
>> 2015-02-04  Matthew Wahab  <>
>>         * config/aarch64/aarch64-cores.def: Add cortex-a72 and
>>         cortex-a72.cortex-a53.
>>         * config/aarch64/ Regenerate.
>>         * doc/invoke.texi (AArch64 Options/-mtune): Add "cortex-a72".
> Thanks.   Anyone using this new option, -mcpu=cortex-a72, will need to
> have a binutils build which includes your related binutils change
> (which I just OK'd) because the aarch64 backend in its current form
> will inject a .cpu directive into the output .S.  This dependency is a
> tad unpleasant.  James G has a patch in the works that will change gcc
> behaviour such that we pass through a .arch xxx+feature+feature
> directive into GAS which will remove this particular dependency but I
> think that change will need to wait for stage-1 now.  This patch is
> low risk and I'd like the -mcpu=cortex-a72 recognition support in for
> gcc5. OK, commit it.  /Marcus

That's usual practice these days. If it affects many people an option
might be to backport the basic GAS support into the 2.25 release
branch so that it's available in a release branch.


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