[LLVMdev] Contributing the Apple ARM64 compiler backend

James Molloy
Mon, 31 Mar 2014 20:40:01 -0000

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

>
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