[LLVMdev] Contributing the Apple ARM64 compiler backend

[Eric Christopher]

On Mon, Mar 31, 2014 at 12:54 PM, Renato Golin <renato.golin at linaro.org> wrote:
> On 31 March 2014 20:43, Eric Christopher <echristo at gmail.com> wrote:
>>> 2.      Performance on A53. But isn't it really just the scheduling model
>>> that needs updating? There are no A53-specific optimizations in
>>> Target/AArch64 that I know of.
>>
>> Agreed. There could be some small codegen changes, I'm not familiar
>> with the A53.
>
> I don't think there are any A53 specific optimization in the AArch64 back-end.
>
> GCC used the A15 tune as a starting point for A53 specific tuning and
> it's *a lot* better than what LLVM produces already.

Right.

>
> Not to mention that auto-vectorization is not turned on by default on
> AArch64, another thing that would improve massively the quality of the
> code gen, does the ARM64 have it on?
>

Good question.

-eric