RFR(m): java.nio.Bits.unaligned() doesn't return true on ppc

[Doerr, Martin]

Hi Hiroshi,

thanks for providing a fix.

The fix
8158260: PPC64: unaligned Unsafe.getInt can lead to the generation of illegal instructions
was downported to 8, so I think your change is good.

Best regards,
Martin


From: Hiroshi H Horii [mailto:HORII at jp.ibm.com]
Sent: Donnerstag, 1. September 2016 16:27
To: jdk8u-dev at openjdk.java.net; ppc-aix-port-dev at openjdk.java.net
Cc: Gustavo Bueno Romero <gromero at br.ibm.com>; Volker Simonis (volker.simonis at gmail.com) <volker.simonis at gmail.com>; Doerr, Martin <martin.doerr at sap.com>
Subject: RFR(m): java.nio.Bits.unaligned() doesn't return true on ppc

Dear all:

Can I please request reviews for the following change?
This change was created for JDK 8.

Some open sources (such as Spark 2.0) check java.nio.Bits.unaligned()
to recognize support of unaligned memory access in platform.
Though ppc64 and ppc64le support it, unaligned() returns false.

In JDK 9, this method returns unalignedAccess() of jdk.internal.misc.Unsafe
that doesn't exist in JDK8.

jira: https://bugs.openjdk.java.net/browse/JDK-8165231
webrev: http://cr.openjdk.java.net/~gromero/8165231/
(Due to my login issue to the cs.openjdk.java.net, Gustavo thankfully created this webrev.)

Regards,
Hiroshi
-----------------------
Hiroshi Horii, Ph.D.
IBM Research - Tokyo
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