Hi Michihiro and Gustavo, most of our tests (including a subset of JCK) were running over night and I couldn't see any problems related to this change. So I think you can push it if you want to get it in jdk12. Best regards, Martin From: Michihiro Horie <HORIE@jp.ibm.com> Sent: Donnerstag, 13. Dezember 2018 00:05 To: Gustavo Romero <gromero@linux.vnet.ibm.com> Cc: hotspot compiler <hotspot-compiler-dev@openjdk.java.net>; Doerr, Martin <martin.doerr@sap.com>; ppc-aix-port-dev@openjdk.java.net; Simonis, Volker <volker.simonis@sap.com> Subject: Re: RFR: 8215262: PPC64: FMA Vectorization on PPC64 Hi Gustavo, Thanks a lot. It's great to have ~80% reduction on POWER9 Witherspoon. Best regards, -- Michihiro, IBM Research - Tokyo [Inactive hide details for "Gustavo Romero" ---2018/12/13 07:39:15---Hi Michi and Martin, On 12/12/2018 01:53 PM, Doerr, Martin]"Gustavo Romero" ---2018/12/13 07:39:15---Hi Michi and Martin, On 12/12/2018 01:53 PM, Doerr, Martin wrote: From: "Gustavo Romero" <gromero@linux.vnet.ibm.com<mailto:gromero@linux.vnet.ibm.com>> To: "Doerr, Martin" <martin.doerr@sap.com<mailto:martin.doerr@sap.com>>, Michihiro Horie/Japan/IBM@IBMJP, "ppc-aix-port-dev@openjdk.java.net<mailto:ppc-aix-port-dev@openjdk.java.net>" <ppc-aix-port-dev@openjdk.java.net<mailto:ppc-aix-port-dev@openjdk.java.net>>, "hotspot compiler" <hotspot-compiler-dev@openjdk.java.net<mailto:hotspot-compiler-dev@openjdk.java.net>> Cc: "Simonis, Volker" <volker.simonis@sap.com<mailto:volker.simonis@sap.com>> Date: 2018/12/13 07:39 Subject: Re: 8215262: PPC64: FMA Vectorization on PPC64 ________________________________ Hi Michi and Martin, On 12/12/2018 01:53 PM, Doerr, Martin wrote:
this looks good to me. We should be able to test it since it is for Power8. Maybe Gustavo would like to test in addition.
Michi, the change looks good to me too. I've tested it on POWER8 and on POWER9 and observed a reduction of ~30% on my POWER8, but on my POWER9 (Witherspoon) it was ~80%, so it can be even better on a Boston (POWER9 too) machine. Thus, thumbs up from my side. I can sponsor that change but I'll wait an ack. from SAP that it's ok for pushing. Maybe Martin wants to perform additional tests after his first review or others might want to review too... I'm wondering if it would be reasonable to run JCK/TCK against it. Would it test Math.fma() since it's a 9+ method and needs a warmed up JVM? Unfortunately I can't run the JCK/TCK against it myself if it applies here. Thank you. Best regards, Gustavo
Best regards,
Martin
*From:*Michihiro Horie <HORIE@jp.ibm.com<mailto:HORIE@jp.ibm.com>> *Sent:* Mittwoch, 12. Dezember 2018 15:50 *To:* ppc-aix-port-dev@openjdk.java.net<mailto:ppc-aix-port-dev@openjdk.java.net>; hotspot compiler <hotspot-compiler-dev@openjdk.java.net<mailto:hotspot-compiler-dev@openjdk.java.net>> *Cc:* Gustavo Romero <gromero@linux.vnet.ibm.com<mailto:gromero@linux.vnet.ibm.com>>; Doerr, Martin <martin.doerr@sap.com<mailto:martin.doerr@sap.com>>; Simonis, Volker <volker.simonis@sap.com<mailto:volker.simonis@sap.com>> *Subject:* RFR: 8215262: PPC64: FMA Vectorization on PPC64
Dear all,
Would you please review the following change? This change supports FMA vectorization on PPC64.
Bug: https://bugs.openjdk.java.net/browse/JDK-8215262 Webrev: http://cr.openjdk.java.net/~mhorie/8215262/webrev.00/ <http://cr.openjdk.java.net/%7Emhorie/8215262/webrev.00/>
Microbenchmark I used is http://cr.openjdk.java.net/~mhorie/8215262/VFma.java <http://cr.openjdk.java.net/%7Emhorie/8215262/VFma.java> It showed ~50% reduction in the execution time.
I also tested with JTREG and there was no difference in the results compared to the original.
Best regards, -- Michihiro, IBM Research - Tokyo
