[LLVMdev] New JIT APIs

[Lang Hames]

Hi Chuck,

Thanks for the feedback. I look forward to hearing how the upgrade to
3.6/3.7 goes.

- Lang.

On Mon, Jan 19, 2015 at 9:28 PM, Caldarale, Charles R <
Chuck.Caldarale at unisys.com> wrote:

> From: Lang Hames [mailto:lhames at gmail.com]
> Subject: Re: [LLVMdev] New JIT APIs
>
> > > We're currently using LLVM 3.3 in production (due to performance
> regressions in newer
> > > versions), so I don't know if some other scheme is appropriate for
> current levels.
>
> > Do you have any insight into what regressed?
>
> The differences were noted using our standard in-house benchmarks, and we
> haven't really had the time to do much EMON- and instruction-level research
> into the differences (the product isn't out the door yet).  One of the
> problems may be in register allocation, since there seemed to be more
> spills and reloads; there's no evidence that MCJIT itself was an issue.
> We'll be able to start checking out 3.6 (or 3.7) in detail in June or
> thereabouts.
>
>  - Chuck
>
>
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