[LLVMdev] LTO question

[Eric Christopher]

On Fri Dec 12 2014 at 1:00:55 PM Adve, Vikram Sadanand <vadve at illinois.edu>
wrote:

> I've been asked how LTO in LLVM compares to equivalent capabilities in
> GCC.  How do the two compare in terms of scalability?  And robustness for
> large applications?
>
>
It depends on which scheme that's being used, but in general full LTO falls
over in scaling past a certain size application due to memory use etc.
(Debug info is also a problem, but see below). Not sure what you mean
between scalability and robustness though. If you've got some more specific
questions I can probably give you a rundown of some of the differences.


> Also, are there any ongoing efforts or plans to improve LTO in LLVM in the
> near future?
>
>
Yes. Many ongoing efforts. See the metadata rewrite, the FDO/PGO work, etc.
It's an area of active development and work.

-eric


> Any information would be much appreciated.  Thanks,
>
> --Vikram S. Adve
> Visiting Professor, Computer Science, EPFL
> Professor, Department of Computer Science
> University of Illinois at Urbana-Champaign
> vadve at illinois.edu
> http://llvm.org
>
>
>
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