[PATCH] Enable ARM tail calls for ELF

[Quentin Colombet]

Hi Tim,

The patch LGTM with one question:
Do you have any performance number to see the impact of this patch?

Indeed, tail calls are generally faster, but I am wondering why it was not enabled for non-iOS targets before your patch. Hence, having some evidences that it does not have weird side effects would be nice.

Thanks,

-Quentin

On Jun 30, 2013, at 3:12 AM, Tim Northover <t.p.northover at gmail.com> wrote:

> Hi,
> 
> The attached patch enables tail calls for every target that hasn't
> explicitly been marked as bad (iOS < 5.0). This amounts to any ELF
> target and being more liberal on some ghost MachO targets (e.g.
> arm-apple-darwin9) that no-one probably cares about.
> 
> I think the ELF side is justified because the required linker support
> is there in the ARM ELF specification so anywhere it doesn't work has
> a broken linker. I've also tested it on Linux and our MCJIT dynamic
> loader with no issues.
> 
> Does anyone object to the change?
> 
> Cheers.
> 
> Tim.
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