[LLVMdev] Contributing the Apple ARM64 compiler backend

[Eric Christopher]

On Mon, Mar 31, 2014 at 1:40 PM, James Molloy <James.Molloy at arm.com> wrote:
> 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?

I, too, believe this.

-eric

>
> 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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