RFR: 8129426: aarch64: add support for PopCount in C2

[Vladimir Kozlov]

Looks good.

Thanks,
Vladimir

On 6/25/15 7:44 AM, Edward Nevill wrote:
> Hi,
>
> Aarch64 currently does not support the PopCountI and PopCountL nodes in aarch64.ad
>
> The following webrev adds support for these using the SIMD instructions 'cnt' and 'addv'
>
> http://cr.openjdk.java.net/~enevill/8129426/webrev.04
>
> This patch was contributed by alexander.alexeev at caviumnetworks.com
>
> The patch only modifies aarch64 specific files.
>
> I have merged the patch in and tested it with JTreg / hotspot with the following results for both original and revised
>
> Test results: passed: 858; failed: 4; error: 6
>
> I have benchmarked the patch on four different partner platforms. The average improvement was 2.6X for PopCountI and 2.5X for PopCountL.
>
> Please review,
>
> Thanks,
> Ed.
>
>