[llvm-dev] Reversion of rL292621 caused about 7% performance regressions on Cortex-M

[Wei Mi via llvm-dev]

Hi Evgeny,

The failure is a compiler crash on an out-of-tree target in apple.
Quentin is helping to find a reproducible but havn't succeeded yet.
Once I get a reproducible, I will fix it. Thanks for the interest on
the work. Details about the crash can be found here:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20170123/422853.html

Thanks,
Wei.


On Fri, Jan 27, 2017 at 10:11 AM, Evgeny Astigeevich
<Evgeny.Astigeevich at arm.com> wrote:
> Hi Wei,
>
>
>
> Your reversion of rL292621 caused about 7% performance regressions in our
> benchmark on Cortex-M7/M4.
>
> In your commit comment I see it causes build bot failures.
>
> What kind are the failures? Compiler crashes or incorrect code generation?
> Will you fix them?
>
> We are interested in the changes because of performance improvements they
> give.
>
>
>
> Kind regards,
>
> Evgeny Astigeevich
>
> Senior Compiler Engineer
> Compilation Tools
> ARM
>
>