[llvm-dev] [RFC] Turn the MachineOutliner on by default in AArch64 under -Oz

[Andrew Grieve via llvm-dev]

Yvan - wondering if you've made any inroads with outlining for arm32?

On Thu, Apr 26, 2018 at 5:17 AM, Yvan Roux via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> On 25 April 2018 at 14:02, David Green via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > Hello
> >
> > A 4.4% geomean codesize improvement is really impressive. That stuff is
> hard to come by, you usually have to nibble away at it bit at a time. I ran
> some codesize benchmarks we have and they were in the same ballpark. Some
> of these are quite small so had less opportunity for outlining, but the
> average was still over 3% with some as high as 9-10%.
> >
> > All the tests I ran were fine, although we don't have a lot of -Oz
> AArch64 testing.
>
> I made the same experiments during the last weeks inside Linaro and
> got the same kind of figures.
>
> > Thanks for working on this, we'll have to see about getting it working
> for Arm code too!
>
> Porting the outliner on ARM is in my plans for this year (as discussed
> with other ARM folks at EuroLLVM last week), to avoid duplication is
> it ok for you if I work on it, David, Jessica ?
>
> Cheers,
> Yvan
>
> > Dave
> > _______________________________________________
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