RFR(S) JDK-8181810 PPC64: Leverage extrdi for bitfield extract

[Volker Simonis]

Hi Matthew, Martin,

thanks for contributing and reviewing this change. It looks good!

@Martin: can you please update the copyright year before pushing?

Regards,
Volker


On Tue, Jun 20, 2017 at 11:50 AM, Doerr, Martin <martin.doerr at sap.com> wrote:
> Hi Matt,
>
> nice change. I have reviewed it and didn't see any mistakes. We will build and test it, too.
> I can also sponsor it after a 2nd review.
>
> Thanks and best regards,
> Martin
>
>
> -----Original Message-----
> From: hotspot-dev [mailto:hotspot-dev-bounces at openjdk.java.net] On Behalf Of Matthew Brandyberry
> Sent: Montag, 19. Juni 2017 18:35
> To: hotspot-dev at openjdk.java.net
> Subject: Re: RFR(S) JDK-8181810 PPC64: Leverage extrdi for bitfield extract
>
> Apologies for the bad cut-and-paste job.. the body of this review
> request should
> read as follows:
>
> This is a PPC-specific hotspot optimization that leverages the extrdi
> instruction
> for bitfield extract operations (shift-right and mask-with-and). It
> yields a
> ~25% improvement measured via a microbenchmark.
>
> Please review:
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8181810
> Webrev: http://cr.openjdk.java.net/~gromero/8181810/v1/
>
> Thanks,
> Matt
>
>
> On 6/19/17 11:30 AM, Matthew Brandyberry wrote:
>> This is a PPC-specific hotspot optimization that leverages the
>> mtfprd/mffprd
>> instructions for for movement between general purpose and floating point
>> registers (rather than through memory).  It yields a ~35% improvement
>> measured
>> via a microbenchmark.
>>
>> Please review:
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8181809
>> Webrev: http://cr.openjdk.java.net/~gromero/8181809/v1/
>>
>> Thanks,
>> Matt
>>
>