[LLVMdev] Contributing the Apple ARM64 compiler backend

[Kipping, David]

I would like to see comparative performance on cortex A53 and A57 before commenting. I hope to have this for discussion at the hackers lab at EuroLLVM.

-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of James Molloy
Sent: Monday, March 31, 2014 1:40 PM
To: Eric Christopher; JF Bastien
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Contributing the Apple ARM64 compiler backend

Hi,

Apart from whether fast-isel should be enabled or disabled (I think enabled, personally), I haven't heard any dissenting voices about how to attack the merge problem yet.

Tim, am I correct in saying that you believe AArch64 -> ARM64 is the right way to go?

Does anyone disagree with that approach?

Cheers,

James
________________________________________
From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] On Behalf Of Eric Christopher [echristo at gmail.com]
Sent: 31 March 2014 21:28
To: JF Bastien
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Contributing the Apple ARM64 compiler backend

On Mon, Mar 31, 2014 at 1:23 PM, JF Bastien <jfb at google.com> wrote:
> On Mon, Mar 31, 2014 at 1:01 PM, Renato Golin 
> <renato.golin at linaro.org>
> wrote:
>>
>> On 31 March 2014 20:55, Tim Northover <t.p.northover at gmail.com> wrote:
>> > I'd almost prefer to leave it in for the bugs to be discovered 
>> > (perhaps after some simple tests of our own). ARM went wirthout 
>> > FastISel support on Linux for years simply because it was declared 
>> > Darwin-only.
>>
>> Given the unique opportunity we have now, I'd say we should at least 
>> give it a try.
>
>
> I'm not sure I understand what you're proposing: check in with 
> FastISel turned on for Linux, or off? I'd be afraid of bitrot if it's 
> off, which was the main issue on the ARM side because code got added 
> assuming Linux would work the same. Does it pass the tests on Linux 
> with FastISel, or do we at least understand what's missing?

I think we're assuming it's turned on in ToT. And I haven't done any testing of the generated code for fast isel.

-eric

>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev


-- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium.  Thank you.

ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No:  2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No:  2548782


_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev