[llvm-dev] Enable new inline cost heuristic for switch

[via llvm-dev]

Kindly ping.

Can anyone please take a chance to test the new switch inline cost 
heuristic (r301649). In my experiment for spec2000/spec2006/llvm-ts in 
AArch64, significant performance (+17.8%) and size (-8%) benefit was 
observed in spec2000/vertex with LTO while no significant code size / 
performance regression was found in O3/O2/Os. I posted D32653 to enable 
the flag (-inline-generic-switch-cost) for your test. It will be really 
great if this heuristic is tested in different targets and for other 
applications.

Thanks,
Jun

On 2017-04-28 15:35, junbuml at codeaurora.org wrote:
> Hi,
> 
> I'm trying to turn on a flag (-inline-generic-switch-cost) introduced
> in r301649 which improved the inline cost heuristic for switch. In my
> experiment for LLVM test suite and spec2000/2006 in AArch64, +17.82%
> performance  and -8% code size reduce was observed in spec2000/vertex
> with O3 LTO. No significant code size / performance regression was
> found in O3/O2/Os.
> 
> Before we turn this flag on by default, I want this change to be
> tested on other targets as well as for other applications. Can anyone
> please take a change to test this and share the result in D32653.
> 
> Thanks,
> Jun

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a 
Linux Foundation Collaborative Project.