[llvm-commits] Obtaining CPU information in RuntimeDyld

[Jim Grosbach]

On Oct 29, 2012, at 11:49 AM, Eric Christopher <echristo at gmail.com> wrote:

> (That poor other guy at my misspelled email address)
> 
> Anyhow, I think the best way is just to get it via the object file.

Yep, I concur.

> 
> -eric
> 
> On Mon, Oct 29, 2012 at 10:11 AM, Amara Emerson <amara.emerson at arm.com> wrote:
>> Hi,
>> 
>> I'm trying to improve the stub/call veneer generation, however for the older
>> ARMv4t cores, BLX isn't a supported instruction. This means that without
>> more architecture info, either we don't optimize it at all and stick with
>> the current generic solution or we optimize for ARMv5 and above and break
>> any ARM-Thumb interworking on the JIT for v4t and older targets.
>> 
>> Thanks,
>> Amara
>> 
>> -----Original Message-----
>> From: Jim Grosbach [mailto:grosbach at apple.com]
>> Sent: 29 October 2012 17:05
>> To: Amara Emerson
>> Cc: llvm-commits at cs.uiuc.edu; ecristo at gmail.com
>> Subject: Re: Obtaining CPU information in RuntimeDyld
>> 
>> Hi Amara,
>> 
>> What are you trying to do?
>> 
>> -Jim
>> 
>> On Oct 29, 2012, at 10:02 AM, Amara Emerson <amara.emerson at arm.com> wrote:
>> 
>>> Hi,
>>> 
>>> I'm unsure about the best way to obtain the specific CPU core that is
>> being
>>> targeted in the ExecutionEngine/RuntimeDyld component. It seems currently
>>> the only way to find information like this is via the object file itself.
>>> E.g. RuntimeDyld.cpp:65 where the Arch is retrieved via libObject.
>>> 
>>> What would be the best way to get more information about the CPU type?
>> _If_
>>> passing more information to RuntimeDyld from the client isn't an option
>> for
>>> design reasons, then the only other choice I can see is to implement build
>>> attribute reading in libObject/ELF.
>>> 
>>> Thoughts?
>>> 
>>> Amara
>>> 
>>> 
>>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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