[llvm-commits] Obtaining CPU information in RuntimeDyld

[Amara Emerson]

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
> 
> 
>